DE102011109734A1 - Filter protective cap used for protecting sensor from dust and air pollution, has air detour portion that is provided between bottom section and mounting portion, through which flowing air is returned back - Google Patents

Abstract

The filter protective cap (1) has a bottom section (2) with an air inlet aperture (4), and an opposite mounting portion (3) that is provided with an air outlet aperture (5). An air detour portion (6) is provided between the bottom section and the mounting portion. The flowing air is returned back through the air detour portion, so that the air floating dust at the air detour portion is separated for enabling the filter effect. The air detour portion is wedge shaped and a tip of the wedge is depicted towards the mounting portion.

Description

The present invention relates to a filter protection cap, in particular for sensors for protection against dust or similar air pollutants. Furthermore, the invention relates to an arrangement with a sensor, a filter protection cap and a nozzle.

From the prior art, a dust protection device for pipes is known - G 86 34 416.1 in which two nestable caps 1 and 2 on a pipe end 5 be plugged to protect the inside of the pipe from dust etc. Each of the caps 1 . 2 contains a slot 3 . 4 which provides for a deflection of incoming air. As a result of this flow deflection, there is a deposition of dust particles between the caps, so that the tube 5 is protected from air pollution.

The disadvantage of this arrangement is that two different caps with different diameters must be provided and furthermore it is necessary that the two slots 3 and 4 offset from each other to achieve a filtering effect. It can therefore come to a faulty mounting of the two caps.

It is an object of the invention to avoid the disadvantages mentioned above and to provide a filter protection cap, which on the one hand ensures good protection against dust and also allows good ventilation.

This object is achieved with the subject matter of claim 1.

Characterized in that between the bottom portion and the attachment portion at least one Luftumlenkabschnitt is provided, the air flowing in can be deflected, so that floating in the air dust is deposited on the Luftumlenkabschnitt, so that an excellent filtering effect is achieved.

Advantageously, the filter protection cap may be integrally formed as a substantially cup-shaped hollow body, which is preferably cylindrical or prismatic. Accordingly, the filter protection cap is compact and can be mounted on a corresponding nozzle.

Preferably, the Luftumlenkabschnitt extends rib-shaped from an inner surface of the cup-shaped hollow body, starting radially towards a central portion. By this configuration, a stable structure of the filter protection cap is achieved.

The air deflection section may also be wedge-shaped, wherein a tip of the wedge points in the direction of the fastening section. At the top of the wedge condensation can accumulate which thus can easily flow out of the air inlet opening.

Furthermore, the Luftumlenkabschnitt may have a boundary surface, which is arranged upstream and limits the air inlet opening in the axial direction. As a result, the inflowing air flow impinges on this boundary surface, which ensures a deflection of the air.

Advantageously, the boundary surface of the deflection section is inclined obliquely with respect to the axial direction of the filter protection cap. This tendency can collect separated dust, so that a good filter effect occurs.

Preferably, a projected cross-sectional area of the boundary surface substantially corresponds to the cross section of the air inlet opening. As a result, the size of the air inlet opening is adapted to the size of the boundary surface and the inclined boundary surface can be made larger.

Particularly preferably, the air inlet opening is arranged so that the boundary surface is completely visible. Accordingly, a stream of air flowing through completely hits the boundary surface, so that a large air flow rate is possible.

Advantageously, a passage opening is provided between the boundary surface and an inner surface of the bottom section, so that the air flowing through can flow to the air outlet opening. By this arrangement, the Luftumlenkabschnitt flows around the incoming air and can be deflected at the boundary surface.

There may be provided a plurality of Luftumlenkabschnitte, preferably two, which are particularly preferably regularly spaced from each other and further provided a plurality Luftumlenkabschnitte are provided, preferably two, and each air inlet opening is associated with a Luftumlenkabschnitt. Accordingly, each air inlet opening has a Luftumlenkabschnitt so that the air can flow through each air inlet opening.

Preferably, 6 air inlet openings and 6 Luftumlenkabschnitte are provided, which are each arranged at an angle of 60 ° to each other. This arrangement allows a symmetrical design of the filter protection cap.

Advantageously, in each case 2 opposite passage openings are provided for a Luftumlenkabschnitt. As a result, the air flows around each Luftumlenkabschnitt from both sides.

The attachment portion may have a latching portion, which preferably has an inwardly directed bead to allow attachment thereof to a nozzle. As a result, the filter protection cap can be securely attached to the nozzle.

The filter protection cap can be made of a plastic by injection molding. This manufacturing process offers a particularly cost-effective production of the filter cap.

Furthermore, the present invention claims an arrangement with a sensor, a filter cap according to at least one of the preceding claims and a nozzle, wherein the sensor is disposed within the nozzle and the filter cap closes the nozzle. In this arrangement, the sensor is protected by the filter cap, which air can penetrate and at the same time it is possible that z. B. condensate from the nozzle can flow out of the filter cap again.

The figures show:

1 : A filter protection cap according to the invention in plan view

2 : A section along the line AA in the 1

3 : A section along the line BB according to the 1

4 : An arrangement of dust caps according to the prior art

The 1 to 3 show an embodiment of the present invention. The 1 shows a plan view of a bottom portion 2 a filter protection cap 1 , There are six air inlets 4 recognizable, wherein the bottom section 2 has a circular cross-section.

Like from the 2 to recognize, has the filter protection cap 1 a cup-shaped configuration, wherein two air inlet openings 4 are recognizable. The shape of the filter protection cap can also be configured prism-shaped.

The cut in the 2 passes through two Luftumlenkabschnitte 6 through, which have a rib-shaped configuration. Each air deflection section 6 is wedge-shaped, with the tip of the wedge in the direction of the attachment portion 3 shows. The Befestigungsabschitt 3 has an air outlet opening 5 on. The air deflection sections 6 are each in the axial direction in a line with the air inlet openings 4 arranged.

Each air deflection section 6 extends from an inner surface 11 out to a central section 7 out.

The 3 shows boundary surfaces 8th , which are arranged upstream and inclined with respect to the axial direction A obliquely. Each boundary surface 8th also provides a limitation of an air inlet opening 4 represents.

The bottom section 2 has a blind hole opening in the longitudinal direction and this may be for a mounting of the filter protection cap 1 be used. In addition, the blind hole offers advantages in terms of uniform design of wall thicknesses to improve the manufacturing process.

Dirty air hits the boundary surfaces first 8th and subsequently passes through openings 9 , while dust accumulates on the boundary surfaces 8th from.

Each passage opening 9 starts at an inner surface 12 of the bottom section 2 and extends to a boundary surface 8th out.

To attach the filter protection cap to a nozzle, this has a latching portion 10 which is formed bead-shaped inward. The resting section 10 is in a groove, which is located on the neck, latched.

If condensation forms in the nozzle, this can pass through the air inlet openings 4 get outside again or evaporate.

The sensor can thus detect an ambient pressure or a temperature outside the nozzle since an air passage through the filter protection cap is ensured.

LIST OF REFERENCE NUMBERS

1

Filter cap

2

bottom section

3

attachment section

4

Air inlet opening

5

Air outlet opening

6

Luftumlenkabschnitt

7

Middle section

8th

boundary surface

9

Through opening

10

detent portion

11

Inner surface of the cup-shaped hollow body

12

Inner surface of the bottom section

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 8634416 U [0002]

Claims (15)

Filter protection cap ( 1 ) for protection against dust, in particular for sensors, comprising: a bottom section ( 2 ) with at least one air inlet opening ( 4 ) and a preferably opposite attachment portion ( 3 ) with an air outlet opening ( 5 ), wherein between bottom section ( 2 ) and fixing section ( 3 ) at least one Luftumlenkabschnitt ( 6 ), which deflects air flowing therethrough, so that airborne dust at the air deflecting section (FIG. 6 ) is deposited so as to allow a filtering effect. Filter protection cap ( 1 ) according to claim 1, wherein it is integrally formed as a substantially cup-shaped hollow body, which is preferably cylindrical or prismatic. Filter protection cap ( 1 ) according to claim 1 or 2, wherein the air deflection section ( 6 ) rib-shaped from an inner surface ( 11 ) of the cup-shaped hollow body, starting radially to a central portion ( 7 ) extends. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein the air deflecting section ( 6 ) is wedge-shaped and a tip of the wedge in the direction of the attachment portion ( 3 ) shows. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein the air deflecting section ( 6 ) a boundary surface ( 8th ), which is arranged upstream and the air inlet opening ( 4 ) in the axial direction (A) limited. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein the boundary surface ( 8th ) of the Luftumlenkabschnitts ( 6 ) obliquely inclined in relation to the axial direction (A) of the filter protection cap ( 1 ) is trained. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein a projected cross-sectional area of the boundary surface ( 8th ) substantially the cross section of the air inlet opening ( 4 ) corresponds. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein the air inlet opening ( 4 ) is arranged so that the boundary surface ( 8th ) is completely visible. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein between the boundary surface ( 8th ) and an inner surface ( 12 ) of the bottom portion a passage opening ( 9 ) is provided so that the air flowing through to the air outlet opening ( 5 ) can flow. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein a plurality of air deflection sections ( 6 ) are provided, preferably two, which are particularly preferably regularly spaced from each other and further a plurality of Luftumlenkabschnitte ( 6 ) are provided, preferably two, and each air inlet opening ( 4 ) an air deflecting section ( 6 ) assigned. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein six air inlet openings ( 4 ) and six air deflection sections ( 6 ) are provided, which are each arranged at an angle of 60 degrees to each other. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein in each case two preferably opposite passage openings ( 9 ) for an air deflection section ( 6 ) are provided. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein the attachment portion ( 3 ) a latching section ( 10 ), which preferably has an inwardly directed bead to allow attachment thereof to a nozzle. Filter protection cap ( 1 ) according to at least one of the preceding claims, wherein this is made of a plastic by injection molding. Arrangement with a sensor, a filter protection cap ( 1 ) according to at least one of the preceding claims and a nozzle, wherein the sensor is arranged within the nozzle and the filter protection cap ( 1 ) closes the neck.

Images