CA2090296A1 - Valve plate with a recessed valve assembly - Google Patents
Valve plate with a recessed valve assemblyInfo
- Publication number
- CA2090296A1 CA2090296A1 CA 2090296 CA2090296A CA2090296A1 CA 2090296 A1 CA2090296 A1 CA 2090296A1 CA 2090296 CA2090296 CA 2090296 CA 2090296 A CA2090296 A CA 2090296A CA 2090296 A1 CA2090296 A1 CA 2090296A1
- Authority
- CA
- Canada
- Prior art keywords
- valve
- guides
- assembly
- valve plate
- restraint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/1073—Adaptations or arrangements of distribution members the members being reed valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/1066—Valve plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/14—Check valves with flexible valve members
- F16K15/1402—Check valves with flexible valve members having an integral flexible member cooperating with a plurality of seating surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/14—Check valves with flexible valve members
- F16K15/16—Check valves with flexible valve members with tongue-shaped laminae
- F16K15/162—Check valves with flexible valve members with tongue-shaped laminae with limit stop
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/0318—Processes
- Y10T137/0402—Cleaning, repairing, or assembling
- Y10T137/0491—Valve or valve element assembling, disassembling, or replacing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7838—Plural
- Y10T137/7839—Dividing and recombining in a single flow path
- Y10T137/784—Integral resilient member forms plural valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7879—Resilient material valve
- Y10T137/7888—With valve member flexing about securement
- Y10T137/7891—Flap or reed
- Y10T137/7892—With stop
Abstract
ABSTRACT OF THE DISCLOSURE
A valve plate assembly includes a flapper valve and restraint in recessed intake and outlet ports of a valve plate. The recessed ports have guides located therein corresponding to notched sections of the flapper valve and the restraint such that a foolproof method of assembly can be achieved. In addition, a screw clearance in the top of the piston is not required since the recessed portion allows for the screw to be at or below the surface of the valve plate.
A valve plate assembly includes a flapper valve and restraint in recessed intake and outlet ports of a valve plate. The recessed ports have guides located therein corresponding to notched sections of the flapper valve and the restraint such that a foolproof method of assembly can be achieved. In addition, a screw clearance in the top of the piston is not required since the recessed portion allows for the screw to be at or below the surface of the valve plate.
Description
2 ~ ~
"~L~ PLATB ~ A ~C~BED Y~LY~ A~8ENB~Y"
~A~RO~ND O~ T~ ~N~NTIO~
The present invention relates generally to a valve asse~ly and more particularly to a flapper valve assembly in a valve plate for a pistnn compressor.
Typically, a valve plate is attached to a compressor cylinder block and has intake and discharge ; ~ports to the cylinder. ~The intake valve is mounted on : the underside of the Yalve plate while the discharge valve is located on the top surEace of the valve plate.
~ ~ Typically, reed valves are. used to regulate intake : : : and discharge port openings in alternative fashion where ea:ch port reguires:a separate valve. The reed valves themselves are generally made of thin, resilient metal 15~: leaves and are held in place in a cantilever fa~hion by rivets, small screws, or by other suitable clamping means.
: A reed valve assembly is known in U. S. Patent No.
4j437,490 in which the reed valve arrangement has a base fo ~ed~by two~rigid members~between whlch an intermediate portion of the reed is ~andwiched. One o~ the rigid members has a downstream facing seat for the intake port, while the other of the rlgid members has a downstream facing seat for the discharge port. This arrangement allows for a ~ingle reed to be utilized wherein one free 2~29~
-end thereof acts as an intake valve member, while the other free end serves as a discharge valve member.
Material requirements for the above mentioned arrangement are extensive since two valve plates are used with the reed member sandwiched between the two ~ase members. The recesses of the base member must then be manufactured in complimentary fashion in order for the reed to flex freely within the recess~
~ ARY OF ~HE INV~NTIO~ -The present invention limits the motion of a flapper valve within a recess o~ a valve plate by providing a valve plate using a valve-flapper and a valve restraint of substantially the same two-dimensional shape as the valve-flapper mounted in a recess of the valve plate.
; The valve restraint prevents the flapper valve from moving outside the recess so that it does not hit, for example, a piston in a compressor cylinder. The restraint also provides better valve ef~iciency and lower~ the s~resses on the flapper valve. The recess in the valve plate according to.the present invention provides for an error proof assembly of the flapper valve and the restraint in the valve plate. It is thereby insured that the flapper has its i.nherently curved surface pressed a~ainst the valve plate.
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2~2~6 , Guides are provided in the recess to eliminate the need for additional fixtures to position the flapper valve and valve restraint over the port in the valve : plate. Furthermore, recessed intake ports eliminate the need for a screw clearance rece~s in the piston top and ~: also allow any 90 degree orientation of the valve plate : and head.
In addition, the exhaust recess reduces clearance volume~to offset the increase caused by ~he intake ;:10 recess. The exhaust recess allows for the addition of sound-reducing/filtering material or baffles in the head without interfering with the valve movement and sealing.
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: : BRIEF DEBCRIP~ION OF T~ D~AWINGS
Fig. l~ is a partial sectional view through a ~ 15 cylinder of a piston compressor showing a valve plate and : ~ ~ valve assemblies of the present invention;
Flg. 2 is a plan view of~a valve:plate and the flapper valves and valve restraints assembled in recesses : : : :
in the valve plate according to the present invention including showing reverse side features thereof in phantom:
Fig. 3 is a bottom plan and elevational views of the valve plate shown in Fig. 2;
Figs. 4A and 4B are bottom plan and elevational views, respect~ully, of the valve restraint o~ the .. . . .
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present invention;
Figs. 5A and 5B are plan and elevational views, respect~ully, of the flapper valve oX the present invention:
5Fig. 6 is an enlarged sectional view of the rece~sed intake ports eliminating the n4ed for a screw clearance recess; and : Fig. 7 is an enlarged sectional view of the flapper ~alve and valve restraint within the recessed p~rtion of the vaIve plate o~ the present invention.
D~CRIPTION O~ ~H13 PR13FE:RRED E~BODIPlEN~r~
Figure 1 shows a piston-type compressor generally at lO. The compressor lO includes at the top an intake port 12 in a manifold 22 into which air or other gases ~5 to be compressed is drawn. An outlet port 14 in the manifold 22 passes therefrom air or other gases:
compressed by the compressor lo.
: The ~low~ o~ air is controlled by a valve plat~
assembly 16 comprising an outlet valve 18 and an inlet 20 valve 20. The outlet valYe 18 and the~inlet valve 20 are flapper valves according to the present invention. The manifold 22 and the valve plate 1.6 are secured tog~ther onto a block 24 by appropriate fasteners, such as a plurality of screws 26a and 26b.
25 The block 24 serves as a superstructure and holds an end of a cylinder 28 tightly within the interior of : . - . :
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a circular groove 30 formed into a lower surface 16a of the valve plate 16. The surface 16a is on a side of the valve plate 16 facing away from the m~ni~old 22. Fi~ne 1 further shows a rod 34 and a piston 36 as each ~unctions within the csmpressor lO~ The piston 36 is mounted for sliding movement within the interior of the cylinder 28. The valve plate 16, the cylinder 28 and the piston 36 form a generally enclosed volume 38 in which the gas is compressed. Although only a single piston :10 cylinder is shown, it is of course contemplated that sev~ral such cylinders are included in an air compressor ; device. The general operatio~ of the piston compressor is described in U.S. Patent No. 4,995,795, the disclosure: of which is herein fully incorporated by ~ 15~ reference.~
:~ ~ Figure 2 shows in greater detail an upper surface 16b o the val~e plate assembly 16. Holes 40a and 40b ~ormed through the valve plate 16 provide for passage of ::: ~ : :: :
inlet air from the manifold 22 into the cylinder 28. The ~;~ 20 ~ inlet valve 20 and inlet restraint 44 are shown in phantom bel~w the holes 40a and 40b si~ce they are ~: positioned on the opposite side~of the valve plate 16.
Holes 42a and 42b permit the passage of compressed air out of the compressor 10 into the manifold 22. An outlet valve restraint 46 is secured above the outlet valve 18.
It can be seen that the valves 18 and 20 are arranged "
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`-~ 20~g~
symmetrically in the valve plate 16.
Both the inlet valve 20 and the outlet valve 18 are secured to the valve plate 16 sandwiches between the valve plate 16 and their respective inlet restraint 44 and outlet restraint 46, bein~ held together by a screw 50a and 50b, respectively. Recesses 51a and 51b in the valve plate 16 allow for each component, the inlet valve 20 or the outlet valve 18, the inlet restraint 44 or the : .
: : : outlet restraint 46, and the inlet screw 50a or the 0 outlet screw 50b to lie at or below khe surface of the : valve plate 16. The moving pis~on 36, thus, cannot .
strike the flapper valve, reducing risk of damage thereto :~ and increasing its use li~e. Also, a screw clearance : recess is not required in the top of the piston 36. The details of the valves 18 and:20 and the restraints 44 and : 46 wlll be furtber described in conjunction with the `igure~ in which they are represented.
Figure 3;shows the lower surface 16a o~ the valve plate 16 with the inlet valve:20 and inlet restraint 44 removed to~r~v~al the~recess 51a. Two holes 40a and 40b extend through the valve plate 16 to permit passage of inlet air into the compressor cylinder. The holes 40a and 40b are in the recess 51a and~are ~ach surrounded by a raised lip 53a and 53b against which the flapper valve 20 seals when in the closed condition. Between the holes 40a and 40b is a valve mounting portion 55. As further . :
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illustrated in Figure 3, guides 58 and 60 and a threaded mounting hole 51a are provided at tha valve mounting portion of the recess Sla of the valve plate 16. The guides 58 and 60 2re off~et within the recess 51a such that slots 52a, 52b, 54a and 54b in the valve 20 and in the restraint 44 are placed directly onto the guides 58 and 60 in the recess provide for assembly in a foolproof manner.
Also visible on the valve plate lS in Figure 3 is the through-extending outlet holes 42a and 42b with a threaded valve mounting hole 57b therebetween. The outlet valve recess 51b is similar in structure to the inlet valve recess, including raised lips around the holes and a mounting portion with offset ~uides. The 15: openings 26a through 26d through which the screws 26 : extend are shown as well.
Figures 4a and 4b show the configuration of the inlet restraint or the outlet restraint 44 or 46, each eing identical in construction. ~he restraints 44 or 46, unlike~the valve~ 18 or 20, are made of a rigid material, generally a ~etal. In one embodiment, the restraint 44 i8 of a zinc~alloy ZA-8. The restraints 44 or 46 limit the extent to which the valves 18 or 20 can ~lex. ~he slots 52a and 52~ are o~f set to the same extent as the guides 58 and 60 and are aligned with the slots 54a and 54b of the valves 18 or 20 as shown in 20~2~
~igure 5a. The 510ts 52a and 52b are in a central mounting portion 59 of the restraint 44 or 46, the mounting portion 59 being rectangular in shape and wider than the ends o~ khe restraint. A central mounting hole 50 for the sc:rew 50a or 50b is provided in the mounting portion 59.
Figure 4B shows a side view of the restraint 44 or : 46 with its curved lower surface 61 which limits the flexing of the flapper valve 18 or 20 after being ~ixed on the valve plate 16. The central mountiny portion 59 is of a constant thickness and the lower sur~ace 61 gradually curves toward an upper surface 63 so that the restraint 44 or 46 is increasingly thin at the ends. The top surface 63 is flat in the pxeferred embodiment. It can be seen that the slot~ 52a zmd 52b extend only part way through the mounting portion 59.
The ~lapper valve 18 or 20, each being identical, is shown in Figure 5A and 5B. The flapper valve 18 or 20 is shaped to fit into the recess 51a or 51b in the valve plate 16 and has slots 54a and 54b which accept the guides 58 and 60 thereinO A central hole 50 for the mounting screw ~Oa or 50b is also.provided. As shown in Figure 5B, the valve flapper 18 or 20 has an inherently concave sur~ace 65 and an inherently convex sur~ace 67.
The slots 54a and 54b are arranged o~fset to insure that the concave surface 65 presses against lips 53 around the , , '' ' :
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inlet and outlet holes 40 and 420 The slots 52a, 52b, 54a and 54b are placed on the guides 58 and 60 within the rece~s of the valve plate 16 as the apparatus is assembled. Since eash of these ~lots 52a/ 52b, 54a and 6 54b are offset in opposite directions from a centerline, a foolproof method i~ provided in assembly of the flapper valves 18 and 20 and the restraints 44 and 46. In particular, although the flapper valve and restraint may : be turned end-to-end, it is not possible to assemble the flapper valve 18 or 20 lnverted.
The preferred flapper valve 18 or 20 is of, for : example, Sandvik #7 C27M02 stainless Swedish flapper ~: valve ste~l; U.H.B. Stainless 716, wodified type 420 : ~ ~ stainless spring steel; or Hitachi GIN-6 hardened 16 stainless flapper valve strip steel. The flapper valve is, for example, 0.004 inch thlck, and the slots 54 are offset by approximately 0.05 inch from the center line f the valve.
As is shown in Figure 6, the restraint 44 or 46 has 2~ a~recess~56 into which the head of the screw ~Ob ~its so ~at the sorew 50b does not extend above the upper :
surface 16b of the valve plate 16 or abo~e the upper surface of the valve restraint 46. The same configuration is provided for the inlet valve 20 so that the head of the screw 50a is below the lower surface 16a of the valve plate 16. The guides 58 and 60 are visible ~09~29~
extending only par~ way to the surface of the valve plate 16 in the slots 52a and 52b.
Figure 7 shows a sectional view of the outlet restraint 46 and the outlet valve 18 within the recess 51b dePined by recess walls 62a and 62b. The recess 51b permits mounting of the flapper valve 18 and the valve restraint 46 so that neither extsnd above the surface o the valve plats 16. The recess walls 62a and 62b are ~: spaced from the edges of the ~lapper valve 18 and the restraint 46 to permit air to pass therehetween when the flapper valve 18 is open as shown in solid outline.
: Ordinarily, however, the curved flapper valve 18 is biased against the lip 53, as shown in phantom. Like ~Figure 6, screw 56 is recessed in thP. restraint 46 such 1~ : that the head of the screw 56 is below the upper surface 16b of the valve plate 16.
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Thus, there is shown and described a valve plate assembly 16 which restrains~the flapper valve 18 from striking the~piston, does not requirP a recess in top of 2~ ~:the piston ~or the valve screw, and can only be assembled with the flapper valve 18 in the prop r orientation.
5ince the~inlet valve is recessed, there is no need for a particular orientation relative to clearan¢e~ on the piston headl so that assembly of the valve plate 16 on the cylinder 28 in any orientation is possible. Since the outlet valve is also recessed, there is room in the :' ~ , ' :
2~29~' manifold 22 for sound reducing material or baf~les without interfering with valve movement.
Although other modifi~-ations and changes may be suggested by those skilled in the art, it is the intention of the inventor to embody within the patent warranted hereon all changas and modifications as reasonably and properly come within the scope of his contribution to the art.
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"~L~ PLATB ~ A ~C~BED Y~LY~ A~8ENB~Y"
~A~RO~ND O~ T~ ~N~NTIO~
The present invention relates generally to a valve asse~ly and more particularly to a flapper valve assembly in a valve plate for a pistnn compressor.
Typically, a valve plate is attached to a compressor cylinder block and has intake and discharge ; ~ports to the cylinder. ~The intake valve is mounted on : the underside of the Yalve plate while the discharge valve is located on the top surEace of the valve plate.
~ ~ Typically, reed valves are. used to regulate intake : : : and discharge port openings in alternative fashion where ea:ch port reguires:a separate valve. The reed valves themselves are generally made of thin, resilient metal 15~: leaves and are held in place in a cantilever fa~hion by rivets, small screws, or by other suitable clamping means.
: A reed valve assembly is known in U. S. Patent No.
4j437,490 in which the reed valve arrangement has a base fo ~ed~by two~rigid members~between whlch an intermediate portion of the reed is ~andwiched. One o~ the rigid members has a downstream facing seat for the intake port, while the other of the rlgid members has a downstream facing seat for the discharge port. This arrangement allows for a ~ingle reed to be utilized wherein one free 2~29~
-end thereof acts as an intake valve member, while the other free end serves as a discharge valve member.
Material requirements for the above mentioned arrangement are extensive since two valve plates are used with the reed member sandwiched between the two ~ase members. The recesses of the base member must then be manufactured in complimentary fashion in order for the reed to flex freely within the recess~
~ ARY OF ~HE INV~NTIO~ -The present invention limits the motion of a flapper valve within a recess o~ a valve plate by providing a valve plate using a valve-flapper and a valve restraint of substantially the same two-dimensional shape as the valve-flapper mounted in a recess of the valve plate.
; The valve restraint prevents the flapper valve from moving outside the recess so that it does not hit, for example, a piston in a compressor cylinder. The restraint also provides better valve ef~iciency and lower~ the s~resses on the flapper valve. The recess in the valve plate according to.the present invention provides for an error proof assembly of the flapper valve and the restraint in the valve plate. It is thereby insured that the flapper has its i.nherently curved surface pressed a~ainst the valve plate.
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2~2~6 , Guides are provided in the recess to eliminate the need for additional fixtures to position the flapper valve and valve restraint over the port in the valve : plate. Furthermore, recessed intake ports eliminate the need for a screw clearance rece~s in the piston top and ~: also allow any 90 degree orientation of the valve plate : and head.
In addition, the exhaust recess reduces clearance volume~to offset the increase caused by ~he intake ;:10 recess. The exhaust recess allows for the addition of sound-reducing/filtering material or baffles in the head without interfering with the valve movement and sealing.
: ~ : : : :
::
: : BRIEF DEBCRIP~ION OF T~ D~AWINGS
Fig. l~ is a partial sectional view through a ~ 15 cylinder of a piston compressor showing a valve plate and : ~ ~ valve assemblies of the present invention;
Flg. 2 is a plan view of~a valve:plate and the flapper valves and valve restraints assembled in recesses : : : :
in the valve plate according to the present invention including showing reverse side features thereof in phantom:
Fig. 3 is a bottom plan and elevational views of the valve plate shown in Fig. 2;
Figs. 4A and 4B are bottom plan and elevational views, respect~ully, of the valve restraint o~ the .. . . .
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present invention;
Figs. 5A and 5B are plan and elevational views, respect~ully, of the flapper valve oX the present invention:
5Fig. 6 is an enlarged sectional view of the rece~sed intake ports eliminating the n4ed for a screw clearance recess; and : Fig. 7 is an enlarged sectional view of the flapper ~alve and valve restraint within the recessed p~rtion of the vaIve plate o~ the present invention.
D~CRIPTION O~ ~H13 PR13FE:RRED E~BODIPlEN~r~
Figure 1 shows a piston-type compressor generally at lO. The compressor lO includes at the top an intake port 12 in a manifold 22 into which air or other gases ~5 to be compressed is drawn. An outlet port 14 in the manifold 22 passes therefrom air or other gases:
compressed by the compressor lo.
: The ~low~ o~ air is controlled by a valve plat~
assembly 16 comprising an outlet valve 18 and an inlet 20 valve 20. The outlet valYe 18 and the~inlet valve 20 are flapper valves according to the present invention. The manifold 22 and the valve plate 1.6 are secured tog~ther onto a block 24 by appropriate fasteners, such as a plurality of screws 26a and 26b.
25 The block 24 serves as a superstructure and holds an end of a cylinder 28 tightly within the interior of : . - . :
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2~2~6 .
a circular groove 30 formed into a lower surface 16a of the valve plate 16. The surface 16a is on a side of the valve plate 16 facing away from the m~ni~old 22. Fi~ne 1 further shows a rod 34 and a piston 36 as each ~unctions within the csmpressor lO~ The piston 36 is mounted for sliding movement within the interior of the cylinder 28. The valve plate 16, the cylinder 28 and the piston 36 form a generally enclosed volume 38 in which the gas is compressed. Although only a single piston :10 cylinder is shown, it is of course contemplated that sev~ral such cylinders are included in an air compressor ; device. The general operatio~ of the piston compressor is described in U.S. Patent No. 4,995,795, the disclosure: of which is herein fully incorporated by ~ 15~ reference.~
:~ ~ Figure 2 shows in greater detail an upper surface 16b o the val~e plate assembly 16. Holes 40a and 40b ~ormed through the valve plate 16 provide for passage of ::: ~ : :: :
inlet air from the manifold 22 into the cylinder 28. The ~;~ 20 ~ inlet valve 20 and inlet restraint 44 are shown in phantom bel~w the holes 40a and 40b si~ce they are ~: positioned on the opposite side~of the valve plate 16.
Holes 42a and 42b permit the passage of compressed air out of the compressor 10 into the manifold 22. An outlet valve restraint 46 is secured above the outlet valve 18.
It can be seen that the valves 18 and 20 are arranged "
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`-~ 20~g~
symmetrically in the valve plate 16.
Both the inlet valve 20 and the outlet valve 18 are secured to the valve plate 16 sandwiches between the valve plate 16 and their respective inlet restraint 44 and outlet restraint 46, bein~ held together by a screw 50a and 50b, respectively. Recesses 51a and 51b in the valve plate 16 allow for each component, the inlet valve 20 or the outlet valve 18, the inlet restraint 44 or the : .
: : : outlet restraint 46, and the inlet screw 50a or the 0 outlet screw 50b to lie at or below khe surface of the : valve plate 16. The moving pis~on 36, thus, cannot .
strike the flapper valve, reducing risk of damage thereto :~ and increasing its use li~e. Also, a screw clearance : recess is not required in the top of the piston 36. The details of the valves 18 and:20 and the restraints 44 and : 46 wlll be furtber described in conjunction with the `igure~ in which they are represented.
Figure 3;shows the lower surface 16a o~ the valve plate 16 with the inlet valve:20 and inlet restraint 44 removed to~r~v~al the~recess 51a. Two holes 40a and 40b extend through the valve plate 16 to permit passage of inlet air into the compressor cylinder. The holes 40a and 40b are in the recess 51a and~are ~ach surrounded by a raised lip 53a and 53b against which the flapper valve 20 seals when in the closed condition. Between the holes 40a and 40b is a valve mounting portion 55. As further . :
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illustrated in Figure 3, guides 58 and 60 and a threaded mounting hole 51a are provided at tha valve mounting portion of the recess Sla of the valve plate 16. The guides 58 and 60 2re off~et within the recess 51a such that slots 52a, 52b, 54a and 54b in the valve 20 and in the restraint 44 are placed directly onto the guides 58 and 60 in the recess provide for assembly in a foolproof manner.
Also visible on the valve plate lS in Figure 3 is the through-extending outlet holes 42a and 42b with a threaded valve mounting hole 57b therebetween. The outlet valve recess 51b is similar in structure to the inlet valve recess, including raised lips around the holes and a mounting portion with offset ~uides. The 15: openings 26a through 26d through which the screws 26 : extend are shown as well.
Figures 4a and 4b show the configuration of the inlet restraint or the outlet restraint 44 or 46, each eing identical in construction. ~he restraints 44 or 46, unlike~the valve~ 18 or 20, are made of a rigid material, generally a ~etal. In one embodiment, the restraint 44 i8 of a zinc~alloy ZA-8. The restraints 44 or 46 limit the extent to which the valves 18 or 20 can ~lex. ~he slots 52a and 52~ are o~f set to the same extent as the guides 58 and 60 and are aligned with the slots 54a and 54b of the valves 18 or 20 as shown in 20~2~
~igure 5a. The 510ts 52a and 52b are in a central mounting portion 59 of the restraint 44 or 46, the mounting portion 59 being rectangular in shape and wider than the ends o~ khe restraint. A central mounting hole 50 for the sc:rew 50a or 50b is provided in the mounting portion 59.
Figure 4B shows a side view of the restraint 44 or : 46 with its curved lower surface 61 which limits the flexing of the flapper valve 18 or 20 after being ~ixed on the valve plate 16. The central mountiny portion 59 is of a constant thickness and the lower sur~ace 61 gradually curves toward an upper surface 63 so that the restraint 44 or 46 is increasingly thin at the ends. The top surface 63 is flat in the pxeferred embodiment. It can be seen that the slot~ 52a zmd 52b extend only part way through the mounting portion 59.
The ~lapper valve 18 or 20, each being identical, is shown in Figure 5A and 5B. The flapper valve 18 or 20 is shaped to fit into the recess 51a or 51b in the valve plate 16 and has slots 54a and 54b which accept the guides 58 and 60 thereinO A central hole 50 for the mounting screw ~Oa or 50b is also.provided. As shown in Figure 5B, the valve flapper 18 or 20 has an inherently concave sur~ace 65 and an inherently convex sur~ace 67.
The slots 54a and 54b are arranged o~fset to insure that the concave surface 65 presses against lips 53 around the , , '' ' :
2 ~ 9 ~
inlet and outlet holes 40 and 420 The slots 52a, 52b, 54a and 54b are placed on the guides 58 and 60 within the rece~s of the valve plate 16 as the apparatus is assembled. Since eash of these ~lots 52a/ 52b, 54a and 6 54b are offset in opposite directions from a centerline, a foolproof method i~ provided in assembly of the flapper valves 18 and 20 and the restraints 44 and 46. In particular, although the flapper valve and restraint may : be turned end-to-end, it is not possible to assemble the flapper valve 18 or 20 lnverted.
The preferred flapper valve 18 or 20 is of, for : example, Sandvik #7 C27M02 stainless Swedish flapper ~: valve ste~l; U.H.B. Stainless 716, wodified type 420 : ~ ~ stainless spring steel; or Hitachi GIN-6 hardened 16 stainless flapper valve strip steel. The flapper valve is, for example, 0.004 inch thlck, and the slots 54 are offset by approximately 0.05 inch from the center line f the valve.
As is shown in Figure 6, the restraint 44 or 46 has 2~ a~recess~56 into which the head of the screw ~Ob ~its so ~at the sorew 50b does not extend above the upper :
surface 16b of the valve plate 16 or abo~e the upper surface of the valve restraint 46. The same configuration is provided for the inlet valve 20 so that the head of the screw 50a is below the lower surface 16a of the valve plate 16. The guides 58 and 60 are visible ~09~29~
extending only par~ way to the surface of the valve plate 16 in the slots 52a and 52b.
Figure 7 shows a sectional view of the outlet restraint 46 and the outlet valve 18 within the recess 51b dePined by recess walls 62a and 62b. The recess 51b permits mounting of the flapper valve 18 and the valve restraint 46 so that neither extsnd above the surface o the valve plats 16. The recess walls 62a and 62b are ~: spaced from the edges of the ~lapper valve 18 and the restraint 46 to permit air to pass therehetween when the flapper valve 18 is open as shown in solid outline.
: Ordinarily, however, the curved flapper valve 18 is biased against the lip 53, as shown in phantom. Like ~Figure 6, screw 56 is recessed in thP. restraint 46 such 1~ : that the head of the screw 56 is below the upper surface 16b of the valve plate 16.
:: :
Thus, there is shown and described a valve plate assembly 16 which restrains~the flapper valve 18 from striking the~piston, does not requirP a recess in top of 2~ ~:the piston ~or the valve screw, and can only be assembled with the flapper valve 18 in the prop r orientation.
5ince the~inlet valve is recessed, there is no need for a particular orientation relative to clearan¢e~ on the piston headl so that assembly of the valve plate 16 on the cylinder 28 in any orientation is possible. Since the outlet valve is also recessed, there is room in the :' ~ , ' :
2~29~' manifold 22 for sound reducing material or baf~les without interfering with valve movement.
Although other modifi~-ations and changes may be suggested by those skilled in the art, it is the intention of the inventor to embody within the patent warranted hereon all changas and modifications as reasonably and properly come within the scope of his contribution to the art.
.
:::
::
~: : :
:
Claims (13)
1. A flapper valve assembly for intake and outlet holes to a chamber of a compressor, said valve assembly comprising:
a valve plate forming a wall of said chamber and having said intake and outlet holes therethrough, said valve plate having a plurality of recessed portions with a plurality of guides at fixed locations and an aperture wherein at least one recessed portion is on an interior wall facing said chamber and another of said plurality of recessed portions is on an external wall facing away from said chamber;
a plurality of resilient members wherein a single member overlays each of said plurality of guided recessed portions, each of said plurality of members having an aperture aligned with said aperture of said valve plate and notched sections corresponding to said fixed locations of said plurality of guides;
a plurality of restraints overlying each of said plurality of resilient members, each of said restraints having a recessed aperture corresponding to said aperture of each of said resilient members wherein each of said restraints further include notched sections corresponding to said fixed locations of said plurality of guides; and a fastener having a head extending through said aligned apertures.
a valve plate forming a wall of said chamber and having said intake and outlet holes therethrough, said valve plate having a plurality of recessed portions with a plurality of guides at fixed locations and an aperture wherein at least one recessed portion is on an interior wall facing said chamber and another of said plurality of recessed portions is on an external wall facing away from said chamber;
a plurality of resilient members wherein a single member overlays each of said plurality of guided recessed portions, each of said plurality of members having an aperture aligned with said aperture of said valve plate and notched sections corresponding to said fixed locations of said plurality of guides;
a plurality of restraints overlying each of said plurality of resilient members, each of said restraints having a recessed aperture corresponding to said aperture of each of said resilient members wherein each of said restraints further include notched sections corresponding to said fixed locations of said plurality of guides; and a fastener having a head extending through said aligned apertures.
2. The assembly of claim 1 wherein said notched sections and said guides are equidistantly and oppositely displaced from a centerline through said apertures.
3. The assembly of claim 1 wherein each of said recessed apertures of said restraints allows said head of said fastener to secure at or below said corresponding interior or exterior wall.
4. The assembly of claim 1 wherein each of said restraints is made of a rigid material thereby limiting motion of each of said resilient members.
5. The assembly of claim 1 wherein each of said plurality of members has an inherent curved surface facing said recessed portion.
6. A method of assembling a flapper valve assembly for intake and outlet holes to a chamber of a compressor comprising the steps of:
providing a valve plate with a plurality of recesses, a plurality of guides at fixed locations, and an aperture;
inserting a resilient member overlying each of said plurality of guided recesses, said resilient member having notched sections corresponding to said fixed locations of said plurality of guides and an aperture aligned with said aperture of said valve plate;
inserting a restraint overlying each resilient member, said restraint having notched sections corresponding to said fixed locations of said plurality of guides and an aperture aligned with said aperture of said valve plate; and extending a fastener having a head through each of said aligned apertures.
providing a valve plate with a plurality of recesses, a plurality of guides at fixed locations, and an aperture;
inserting a resilient member overlying each of said plurality of guided recesses, said resilient member having notched sections corresponding to said fixed locations of said plurality of guides and an aperture aligned with said aperture of said valve plate;
inserting a restraint overlying each resilient member, said restraint having notched sections corresponding to said fixed locations of said plurality of guides and an aperture aligned with said aperture of said valve plate; and extending a fastener having a head through each of said aligned apertures.
7. The method of claim 6 further comprising the step of:
displacing said guides and said notched sections equidistantly and oppositely from a centerline through said respective apertures.
displacing said guides and said notched sections equidistantly and oppositely from a centerline through said respective apertures.
8. The method of claim 6 further comprising the step of:
securing said head of said fastener at or below a corresponding wall of said valve through which said fastener extends.
securing said head of said fastener at or below a corresponding wall of said valve through which said fastener extends.
9. A flapper valve assembly comprising:
a valve plate having at least one recessed portion with a plurality of guides, therein;
a resilient member having a plurality of notched sections corresponding to said plurality of guides for slidably inserting onto said plurality of guides; and a restraint having a plurality notched sections corresponding to said plurality of guides wherein said restraint overlays said member.
a valve plate having at least one recessed portion with a plurality of guides, therein;
a resilient member having a plurality of notched sections corresponding to said plurality of guides for slidably inserting onto said plurality of guides; and a restraint having a plurality notched sections corresponding to said plurality of guides wherein said restraint overlays said member.
10. The assembly of claim 9 further comprising:
a fastener having a head extending through aligned apertures of said valve plate, said member and said restraint.
a fastener having a head extending through aligned apertures of said valve plate, said member and said restraint.
11. The assembly of claim 10 wherein said head of said fastener is secured at or below an exterior or interior wall of said valve plate.
12. The assembly of claim 9 wherein said resilient member has an inherently curved surface facing said recessed portion.
13. The assembly of claim 9 wherein said restraint is a rigid material which limits resiliency of said member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/889,254 US5213125A (en) | 1992-05-28 | 1992-05-28 | Valve plate with a recessed valve assembly |
| US07/889,254 | 1992-05-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2090296A1 true CA2090296A1 (en) | 1993-11-29 |
Family
ID=25394802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2090296 Abandoned CA2090296A1 (en) | 1992-05-28 | 1993-02-24 | Valve plate with a recessed valve assembly |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5213125A (en) |
| EP (1) | EP0571715A1 (en) |
| JP (1) | JPH074358A (en) |
| CA (1) | CA2090296A1 (en) |
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-
1992
- 1992-05-28 US US07/889,254 patent/US5213125A/en not_active Expired - Lifetime
-
1993
- 1993-02-22 EP EP19930102762 patent/EP0571715A1/en not_active Withdrawn
- 1993-02-24 CA CA 2090296 patent/CA2090296A1/en not_active Abandoned
- 1993-04-05 JP JP10195993A patent/JPH074358A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US5213125A (en) | 1993-05-25 |
| EP0571715A1 (en) | 1993-12-01 |
| JPH074358A (en) | 1995-01-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |