CN101818851B - Thermodynamic component of saturated steam-pressure bellow for automatic steam trap - Google Patents
Thermodynamic component of saturated steam-pressure bellow for automatic steam trap Download PDFInfo
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- CN101818851B CN101818851B CN 200910117558 CN200910117558A CN101818851B CN 101818851 B CN101818851 B CN 101818851B CN 200910117558 CN200910117558 CN 200910117558 CN 200910117558 A CN200910117558 A CN 200910117558A CN 101818851 B CN101818851 B CN 101818851B
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- bellows
- rigid support
- bellow
- steam
- seal ring
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Abstract
The invention discloses a thermodynamic component of a saturated steam-pressure bellow for an automatic steam trap, which aims to reduce the steam leakage rate and improve the steam blocking performance. The thermodynamic component is characterized in that: the lower end thereof is provided with an airtight and tubular rigid bracket (3) which is coaxial with the bellow (2); the rigid bracket (3) is embedded into the bellow (2); a fixed plate (1) is connected with the upper end of the rigid stent (3); the plane in which the fixed plate (1) is positioned is perpendicular to the axis (OO') of the rigid bracket (3); the lower end of the bellow (2) is embedded into a sealing ring (4) with a cylindrical upper end; the lower end of the sealing ring (4) is provided with a screw which forms a connecting pair with threads on the inner wall of a valve spool (5); the axis of the sealing ring (4) and the axis of the valve spool (5) are both coaxial with the axis (OO') of the rigid bracket (3); and the inner wall of the bellow (2), the outer wall of the rigid bracket (3) and the inner wall of the upper cylinder of the sealing ring (4) form a closed space in which a low boiling-point phase-change medium (7) is filled.
Description
Technical field
The present invention relates to the Automatic steam trap Trap thermodynamic element.
Background technique
Commonly used to the bellows thermodynamic element in Automatic steam trap Trap, the bellows thermodynamic element can be directly as the open-shut device of Automatic steam trap Trap in actual use, and when high-temperature steam passed through valve, bellows element expanded, and valve closing stops passing through of steam; When low-temperature condensate passed through the drain valve valve body, bellows element was shunk, and opens valve, the beginning draining; Also can be used as the independent venting gas appliance of drain valve, set up a bellows escape cock that aims at exhaust such as normal higher position, draining liquid level top in Ball float steam trap; Can also be as the pilot valve of large discharge capacity guided water discharge valve, with the bellows thermodynamic element as pilot valve.But the corrugated pipe effluent valve of at present domestic production mainly is neat liquid expansion bellows, because bellows element axial displacement and the temperature line relationship of neat liquid expansion, and the temperature of temperature-sensitive solution in the bellows to be variation with temperature in the valve change, therefore this neat liquid expansion corrugated pipe effluent valve water of condensation discharge capacity is unstable.The bellows thermodynamic element is owing to the long-time influence of unbalance power of steam condensate to it, be subject to the larger effect of fluid impulse force near inlet side, (especially when working pressure is higher) tends to occur bellows element fatigue in use for some time, axis produces crooked, so that bellows thermodynamic element when action valve closing is not tight, produce and leak vapour, even lost efficacy.The core of bellows thermodynamic element working principle is to rely on to fill the volume variation with temperature of phase change medium in the bellows and change, heat transfer then needs the regular hour, for existing product, temperature can only be filled the phase change medium transmission by a side (outer wall) in bellows, heat transfer area is little, and transmission rate is slow, causes valve event excessively slow, the leakage vapour rate of drain valve increases, and lags behind seriously as seen.
Summary of the invention
The objective of the invention is to have reduced leakage vapour rate, improve the vapor barrier property energy.
The present invention is thermodynamic component of saturated steam-pressure bellow for automatic steam trap, the lower end is airtight, the rigid support 3 of tubular is coaxial with bellows 2, rigid support 3 is nested in the bellows 2, fixed plate 1 is connected with the upper end of rigid support 3, the plane at fixed plate 1 place is perpendicular to the axes O O ' of rigid support 3, the lower end of bellows 2 is nested in the upper end in the seal ring 4 cylindraceous, the lower end of seal ring 4 is a screw rod, consist of an auxiliary connection with the screw thread on spool 5 inwalls, seal ring 4, the axis of spool 5 is all coaxial with the axes O O ' of rigid support 3, the outer wall of the inwall of bellows 2 and rigid support 3, the inwall of seal ring 4 upper end cylinders forms an airtight space, is filled with lower boiling phase change medium 7 in this confined space.
Saturated vapor pressure formula corrugated pipe effluent valve of the present invention has overcome the little and unsettled shortcoming of discharge capacity of liquid expansion type discharge capacity, improves thermostatic element highly sensitive, has reduced leakage vapour rate, improves the Automatic steam trap Trap energy-saving horizontal.
Description of drawings
Fig. 1, Fig. 2 is two embodiments' of the present invention section of structure, Fig. 3 is Fig. 1, A place partial enlarged drawing among Fig. 2, Fig. 4 is Fig. 1, B place partial enlarged drawing among Fig. 2, Fig. 5 is Fig. 1, C place partial enlarged drawing among Fig. 2, Fig. 6 (a) is the analysis chart that the bellows Automatic steam trap Trap leaves action force under the valve state, Fig. 6 (b) is the analysis chart that the bellows Automatic steam trap Trap closes action force under the valve state, Fig. 7 is the temperature variant empirical curve of saturated vapor pressure formula bellows thermostatic element elongation of different phase change mediums, and Fig. 8 is relatively schematic diagram of bellows thermostatic element superiority.
Embodiment
As shown in Figure 1, it is first embodiment of the invention, thermodynamic component of saturated steam-pressure bellow for automatic steam trap of the present invention, wherein the lower end is airtight, the rigid support 3 of tubular is coaxial with bellows 2, rigid support 3 is nested in the bellows 2, fixed plate 1 is connected with the upper end of rigid support 3, the plane at fixed plate 1 place is perpendicular to the axes O O ' of rigid support 3, the lower end of bellows 2 is nested in the upper end in the seal ring 4 cylindraceous, the lower end of seal ring 4 is a screw rod, consist of an auxiliary connection with the screw thread on spool 5 inwalls, seal ring 4, the axis of spool 5 is all coaxial with the axes O O ' of rigid support 3, the outer wall of the inwall of bellows 2 and rigid support 3, the inwall of seal ring 4 upper end cylinders forms an airtight space, is filled with lower boiling phase change medium 7 in this confined space.Have bolt hole on the edge of fixed plate 1, be connected and fixed by bolt and steam drainage valve body.
As shown in Figure 2, second embodiment of the invention is removed fixed plate 1 other structure identical with first embodiment; On its fixed plate 1 screw thread is arranged, be threaded connection saturated vapor pressure formula bellows thermodynamic element is fixed in the Automatic steam trap Trap.
Such as Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, fixed plate 1 and rigid support 3, rigid support 3 and bellows 2, the contact position of bellows 2 and seal ring 4 all adopts welding manner to be fixed together.Have on the cylindrical wall of seal ring 4 upper ends and fill mouth, fill mouth by 6 sealings of sealing rivet.
As shown in Figure 1 and Figure 2, filling mouth on the seal ring 4 adopts welding manner to be tightly connected with sealing rivet 6 junctions.On the rigid support 3 of position between fixed plate 1 and bellows 2 upper ends, along offer evenly distributedly on the same circumference of rigid support 3 6～12 apertures 3 '.
The boiling point of phase change medium 7 hangs down 0 ℃～20 ℃ than the boiling point of water.Phase change medium 7 is water, or anhydrous alcohol, or alcohol solution.
As shown in Figure 1 and Figure 2, working procedure is as follows: when valve was just started working, the temperature in the valve was lower, and the phase change mediums 7 in the bellows 2 are in contraction state, and at this moment valve opening can discharge condensed water, air also has other non-condensible gas; When being full of high-temperature steam in the valve, the vaporization of being heated simultaneously in interior outside of the phase change mediums 7 in the bellows 2, volume increases rapidly, so that bellows 2 extends along axial direction, move with the direction of movable valve plug 5 to valve closing, owing to being swift in motion, effectively stop steam leakage; Along with the condensed water in the valve increases, the temperature in the valve reduces, and phase change medium 7 condensations are shunk, and volume reduces, and bellows 2 restores to the original state, and spool 5 is opened valve opening, discharges condensed water.
Shown in Fig. 6 (a), when valve opening is held open state, the equilibrant of flap:
F
1≤F
2+F
3
In the formula: F
1Be the expansive force of temperature-sensitive solution, F
2For acting on the medium power on the bellows basal area, F in the drain valve
3The elastic force that is stretched for bellows.
Shown in Fig. 6 (b), the equilibrant that flap has just been closed transition point at valve is as follows:
F
1′≥F
2′+F
3′+F
4
Wherein, F
4Be the draining jet flow reacting force:
F
4＝0.94(p
1-p
2)S
0 (6)
p
sS≥p
1S+KΔh+0.94(p
1-p
2)S
0 (7)
In the formula: P
SFor bellows element is filled phase change medium 7 phase transformation saturated vapor pressures, P
1For upstream pressure is working pressure, P
2For downstream pressure is back pressure, K is the rigidity of bellows element, and S is the bellows element basal area, S
0Be the drain valve valve seat area, Δ h is the bellows element elongation.
At drain valve working pressure P
1Lower, as back pressure P
2One regularly, and the variation of temperature is approximated to exponential relationship in bellows thermostatic element elongation and the drain valve.
The open amount of the liquid expansion type corrugated pipe effluent valve of phase change medium 7 becomes approximately linear to change with the temperature variation of water of condensation in the drain valve.
The phase change medium of filling in the saturated vapor pressure formula bellows thermodynamic element can be selected purified water, anhydrous alcohol, alcohol solution, specifically can determine according to needed draining Subcoold temperature, and the purified water Subcoold temperature is zero, and the anhydrous alcohol Subcoold temperature is maximum.The laboratory data that can enumerate with reference to following form is in actual applications selected suitable filled media, to reach necessary elongation, obtains the bellows thermodynamic element of function admirable.
In the experiment, bellows stiffness K is 3.5Nmm
-1, bellows element useful area S is 254mm
2The temperature variant laboratory data of saturated vapor pressure formula bellows thermostatic element elongation of different phase change mediums is as shown in table 1:
The temperature variant laboratory data of saturated vapor pressure formula bellows thermostatic element elongation of the different phase change mediums of table 1
As shown in Figure 7, simulate the temperature variant empirical curve of saturated vapor pressure formula bellows thermostatic element elongation of different phase change mediums according to initial data, to different phase change mediums, bellows thermostatic element displacement h is the monotropic function of phase transition temperature T, and is approximated to exponential function relation; Can adjusting drain valve operating temperature and draining Subcoold temperature with the method for regulating different phase change medium proportions of ingredients.
As shown in Figure 8, according to the saturated vapor pressure formula of above-mentioned analysis foundation and the thermodynamic model of liquid expansion type bellows thermodynamic element, the bellows thermostatic element is at the identical temperature difference (T
2-T
0) in, the elongation of liquid expansion type bellows thermostatic element is Δ h, and the saturated vapor pressure formula have a very large elongation in the phase change zone, be more than the 2 Δ h; The bellows thermostatic element in identical stroke Δ h, the needed water of condensation temperature difference of liquid expansion type (T
2-T
0) much larger than the required water of condensation temperature difference (T of saturated vapor pressure formula
2-T
1).Therefore, saturated vapor pressure formula bellows thermostatic element action sensitivity is higher than liquid expansion type.Because the size of the stroke of bellows thermostatic element is determining discharge capacity, therefore saturated vapor pressure formula corrugated pipe effluent valve of the present invention has overcome the little and unsettled shortcoming of discharge capacity of liquid expansion type discharge capacity.In addition, improve thermostatic element highly sensitive, can reduce the vapour rate of leaking, improve the Automatic steam trap Trap energy-saving horizontal.
Claims (8)
1. thermodynamic component of saturated steam-pressure bellow for automatic steam trap, a bellows (2) is arranged, it is characterized in that the lower end is airtight, the rigid support of tubular (3) is coaxial with bellows (2), rigid support (3) is nested in the bellows (2), fixed plate (1) is connected with the upper end of rigid support (3), the plane at fixed plate (1) place is perpendicular to the axis (OO ') of rigid support (3), the lower end of bellows (2) is nested in the upper end in the seal ring cylindraceous (4), the lower end of seal ring (4) is a screw rod, consist of an auxiliary connection with the screw thread on spool (5) inwall, seal ring (4), the axis of spool (5) is all coaxial with the axis (OO ') of rigid support (3), the outer wall of the inwall of bellows (2) and rigid support (3), the inwall of seal ring (4) upper end cylinder forms an airtight space, is filled with the phase change medium (7) than low 0 ℃～20 ℃ of the boiling point of water in this confined space.
2. thermodynamic component of saturated steam-pressure bellow for automatic steam trap according to claim 1, it is characterized in that fixed plate (1) and rigid support (3), rigid support (3) and bellows (2), the contact position of bellows (2) and seal ring (4) all adopts welding manner to be fixed together.
3. thermodynamic component of saturated steam-pressure bellow for automatic steam trap according to claim 1 is characterized in that having on the cylindrical wall of seal ring (4) upper end and fills mouthful, fills mouthful by sealing rivet (6) sealing.
4. thermodynamic component of saturated steam-pressure bellow for automatic steam trap according to claim 3 is characterized in that the upper mouth of filling of seal ring (4) adopts welding manner to be tightly connected with sealing rivet (6) junction.
5. thermodynamic component of saturated steam-pressure bellow for automatic steam trap according to claim 1, it is characterized in that on the rigid support (3) that is positioned at position between fixed plate (1) and bellows (2) upper end, along offering evenly distributedly 6～12 apertures (3 ') on the same circumference of rigid support (3).
6. thermodynamic component of saturated steam-pressure bellow for automatic steam trap according to claim 1 is characterized in that having bolt hole on the edge of fixed plate (1), can be connected and fixed by bolt and steam drainage valve body.
7. thermodynamic component of saturated steam-pressure bellow for automatic steam trap according to claim 1 is characterized in that having screw thread on the outer wall of fixed plate (1), can be connected and fixed by screw thread and steam drainage valve body.
8. thermodynamic component of saturated steam-pressure bellow for automatic steam trap according to claim 1 is characterized in that phase change medium is water, or anhydrous alcohol, or alcohol solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910117558 CN101818851B (en) | 2009-11-02 | 2009-11-02 | Thermodynamic component of saturated steam-pressure bellow for automatic steam trap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910117558 CN101818851B (en) | 2009-11-02 | 2009-11-02 | Thermodynamic component of saturated steam-pressure bellow for automatic steam trap |
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| Publication Number | Publication Date |
|---|---|
| CN101818851A CN101818851A (en) | 2010-09-01 |
| CN101818851B true CN101818851B (en) | 2013-01-02 |
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|---|---|---|---|
| CN 200910117558 Expired - Fee Related CN101818851B (en) | 2009-11-02 | 2009-11-02 | Thermodynamic component of saturated steam-pressure bellow for automatic steam trap |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4201366A (en) * | 1978-03-13 | 1980-05-06 | Danko Oliver L | Bellows valve |
| CN2038988U (en) * | 1988-06-13 | 1989-06-07 | 国营长沙疏水阀厂 | Controlled temp. type multifunctional drain valve |
| CN2129368Y (en) * | 1992-02-15 | 1993-04-07 | 周本安 | Internal-vaporing dynamical effluent valve |
| CN2526647Y (en) * | 2000-11-14 | 2002-12-18 | 顾锡璋 | Steam-blocking water-draining valve |
-
2009
- 2009-11-02 CN CN 200910117558 patent/CN101818851B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4201366A (en) * | 1978-03-13 | 1980-05-06 | Danko Oliver L | Bellows valve |
| CN2038988U (en) * | 1988-06-13 | 1989-06-07 | 国营长沙疏水阀厂 | Controlled temp. type multifunctional drain valve |
| CN2129368Y (en) * | 1992-02-15 | 1993-04-07 | 周本安 | Internal-vaporing dynamical effluent valve |
| CN2526647Y (en) * | 2000-11-14 | 2002-12-18 | 顾锡璋 | Steam-blocking water-draining valve |
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| Publication number | Publication date |
|---|---|
| CN101818851A (en) | 2010-09-01 |
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