DE202016106772U1 - Idling valve for multi-stage reciprocating compressor - Google Patents

Abstract

An idling valve (2) for installation in a cylinder head for a multistage reciprocating compressor for compressing a compressible working fluid, comprising a valve body (12), a guide body (13) and a spring element (11), wherein - the spring element (11) is arranged such that Valve body (12) is movable into a closed position, wherein a sealing surface (26a) is pressed against a counter-sealing surface (26b) of another component, - between the valve body (12) and the guide body (13) a piston chamber (27) is formed, which is supplied with compressed air via a connecting channel (5), so that when pressure is applied via the connecting channel (5), the valve body (12) is movable from a closed position to an open position, characterized in that the guide body (13) is made in one piece.

Description

The invention relates to an idling valve for a multi-stage reciprocating compressor, which is suitable for compressing a compressible working medium, in particular air, for use in a compressed air supply device in a motor vehicle.

Piston compressor or compressor or air compressor serve the compression of gases, eg. As air, which is used as a working medium for operating various units. Compressors are used, inter alia, in motor vehicles. In operation, such compressors are used, for example, so that a compressed air tank is filled with compressed air until a predetermined pressure level is reached.

The reciprocating compressor essentially consists of a base body with the compressor stages and a cylinder head. In operation, ambient air is drawn in via an inlet channel into the first compressor stage, compressed and then passed through an intermediate channel in a further compressor stage and further compressed there. In a two-stage reciprocating compressor, the compressed air is then passed through an air treatment unit in the compressed air tank.

The drive of the compressor in a motor vehicle is effected by the drive motor of the vehicle. As a rule, no switchable coupling is provided between the drive motor and compressor, so that the compressor is constantly driven, which represents an energy loss.

To minimize such energy losses control devices are provided, which switch the compressor in an idling mode upon reaching a desired filling pressure in the pressure vessel, so that at least no more compaction work.

In the DE 10 2013 001 147 A1 For example, there is disclosed a multi-stage reciprocating compressor having an auxiliary valve or idle valve disposed between the working fluid inlet and the first compressor stage. By applying a pressure, this additional valve can be switched such that working fluid can pass from the displacement into the working medium inlet during the compression movement of the piston. If no pressure is applied, this bypass is closed and precompressed working medium is conveyed into the subsequent compressor stage.

One of the objects of the invention is to improve the idle valve so that improved functionality is achieved.

According to the invention this object is achieved with an idling valve according to claim 1, a cylinder head according to claim 8 and a multi-stage piston compressor according to claim 11. Further advantageous embodiments and preferred variants of the solution are described in the subclaims dependent thereon.

The idling valve according to the invention for installation in a cylinder head for a multi-stage piston compressor for compressing a compressible working medium, comprising a valve body, a guide body and a spring element. The spring element is arranged such that it moves the valve body into a closed position, wherein a sealing surface is pressed against a counter-sealing surface of another component. Furthermore, a piston chamber is formed between the valve body and the guide body, which is supplied via a connecting channel with compressed air, so that when pressure is applied via the connecting channel, the valve body is movable from a closed position to an open position.

In the advantageous embodiment it is provided that the guide body is made in one piece. The one-piece design simplifies the design, manufacture and installation of the idle valve. Furthermore, the manufacturing costs are reduced compared to the StdT. In a preferred embodiment, the guide body is substantially divided into four sections, a mounting section, a guide section, a piston section and a head section. Where the diameter of mounting section ( 28 ), Leadership section ( 29 ) and piston section ( 30 ) can be graduated larger.

Furthermore, the piston chamber may be limited by seals which are inserted in grooves, wherein in each case at least one seal may be provided in the guide section and in the piston section. In particular, a sealing element can be made in two parts, consisting of a sliding ring and an O-ring.

In order to optimize the air flow, in particular the head section can furthermore have a flow-optimized contour. This contour can be spherical, conical, parabolic or a combined contour.

To improve the tightness can be provided between the lateral surface of the valve body and sealing surface a chamfer.

The idling valve described can be installed in particular in a cylinder head for a multi-stage piston compressor, this from a cylinder top, a cylinder base and a separator plate disposed therebetween, wherein the cylinder head is locatable on a valve seat plate having a mating sealing surface.

In a preferred embodiment, the cylinder head may have at least two idle valves or, in the case of more than two compressor stages, one idle valve may be provided for each compressor stage.

Furthermore, it can be provided that the springs and / or the piston chambers of the individual idle valves are designed differently. Thus, the switching times and / or the switching force can be designed and optimized differently.

Advantageously, the cylinder head described can be mounted on a multi-stage reciprocating compressor for compressing compressible media. So it is possible to convert existing reciprocating compressors. For this purpose, only the old cylinder head would have to be replaced with the cylinder head according to the invention.

Further features of the idling valve or the multistage piston compressor according to the invention and further advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings.

The invention will be explained in more detail with reference to drawings.

In these show:

1 Two-stage reciprocating compressor with two idle valves

2 an inventive idling valve

1 shows a piston compressor with two idle valves according to the prior art. The guide body 13 ' is not executed in one piece. The idle valves 2a ' , b 'are in the closed position. In this position of the idle valves, the compressor is in the operating mode and the bypass ports 23a , b are closed.

For the further description of the 1 Instead of in 1 illustrated valves 2a ' , b 'according to the invention also idle valves 2 in the cylinder head 1 be installed.

The basic function is identical for both valve types. The idle valves accordingly 2 can just against the in 1 illustrated valve 2a ' , b 'can be exchanged.

To open the idle valves, these are via the control air connection 24 and the control pressure chamber 25 pressurized with compressed air.

The compressed air comes from the control pressure chamber 25 over the connection channel 5 in the piston chamber 27 , By pressurizing, the valve body moves 12 , against the spring force along the guide body 13 , in an open position.

Furthermore, it can be seen how the idle valves in the cylinder head base 6 are arranged and how they are on the separating plate 7 are attached. In order to keep the structure simple, both idle valves are in a partial region of the suction chamber 4c positioned. In cylinder top 8th is the control pressure chamber 25 arranged over the two idle valves are controlled simultaneously, so that a possible simultaneous switching of the idle valves takes place. To the cubic capacity 19 staggered bypass opening 23b with the cubic capacity 19 to connect the second stage is a discharge channel 3 provided in the valve seat plate.

2 shows an inventive idling valve 2 , The illustrated idle valve is in the closed position. In this position, the valve body 12 through the spring 11 against the valve seat plate 9 pressed. The bypass opening 23a , b is thus closed in this position.

The idle valve substantially comprises a valve body 12 , a leader body 13 and a spring element 11 , Due to this simple structure, the idle valve is only functional when it is installed in a cylinder head.

So it is necessary that the idle valve 2 on a component of the cylinder head 1 is attached, here on the partition plate 7 of the cylinder head 1 , Furthermore, a mating surface 26b needed, against which the valve body 12 with its frontally arranged sealing surface 26a can be pressed. This is the valve seat plate here 9 of the cylinder head 1 or of the compressor.

The central component of the idle valve 2 is the guide body 13 , which can be made in one piece by the simple structure. Furthermore, the guide body 13 essentially four sections up. The attachment section 28 , the guiding section 29 , the piston section 30 and the head section 31 , The diameters of the individual sections are graduated in such a way as in 1 shown that the assembly is very simple and errors or malfunctions can be practically ruled out.

Also the sealing of the piston chamber 27 by means of the packing ( 23a , b) is solved very easily. These are inserted in grooves, in each case at least one seal pack 23a , b in the guide section 29 and in the piston section 30 , Preferably there is a seal package 23a , b from a slip ring and O-ring.

Another special feature is the head section 31 there. This has a flow-optimized contour, which may be in particular a spherical, conical, parabolic or a combined contour. Furthermore, required contour sections can be provided in the contour for the assembly.

To improve the seal between the valve seat plate 9 or the mating surface 26b around the bypass opening 23a , b in the valve seat plate 9 and the sealing surface 26a on the front side of the valve body 12 is a chamfer 32 on the valve body 12 intended.

The actual function of the idle valve, the opening and closing of a passage, is only in the installed state in a cylinder head 1 given. Wherein the idle valve can also be used for retrofitting in existing cylinder heads.

The spring element 11 by means of the valve body 12 is movable in a closed position, is supported as shown in the installed state against the partition plate 7 from.

The springs as well as the piston diameter can be adapted to the requirements of the switching characteristic with respect to the bypass openings. As a result, for example, with simultaneous control, a different switching characteristic can be achieved

The invention is not limited to a two-stage compressor. Rather, more than two stages can be connected in series, in which case one idle valve per compressor stage can then be provided in each case.

LIST OF REFERENCE NUMBERS

1

 cylinder head

2a, b

Idle valve

3

 relief channel

4a, b, c

 suction chamber

5, 5 '

 connecting channel

6

 Cylinder head lower part

7

 separating plate

8th

 Cylinder head shell

9

 Valve seat plate

10

 cooling channel

11

 feather

12

 valve body

13

 guide body

14

 Working fluid inlet

15

 working medium

16a, b

 reciprocating

17

 compressor housing

18

 Displacement first stage

19

 Displacement second stage

20a, b

 Cooling water inlet / water outlet

21a, b

 seal packages

22

 screw

23a, b

 bypass openings

24

 Control air connection

25

Control pressure chamber

26a, b

 Sealing surface / counter-sealing surface

27

 piston chamber

28

attachment section

29

guide section

30

 piston section

31

 header

32

chamfer

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 102013001147 A1 [0006]

Claims (11)

Idle valve ( 2 ) for installation in a cylinder head for a multistage piston compressor for compressing a compressible working medium, comprising a valve body ( 12 ), a guiding body ( 13 ) and a spring element ( 11 ) where - the spring element ( 11 ) is arranged such that the valve body ( 12 ) is movable in a closed position, wherein a sealing surface ( 26a ) against a counter-sealing surface ( 26b ) of another component is pressed, - between the valve body ( 12 ) and the guide body ( 13 ) a piston chamber ( 27 ) is formed, which via a connecting channel ( 5 ) is supplied with compressed air, so that when pressurized via the connecting channel ( 5 ) the valve body ( 12 ) is movable from a closed position to an open position, characterized in that the guide body ( 13 ) is made in one piece. Idle valve ( 2 ) according to claim 1, characterized in that the guide body ( 13 ) has substantially four sections, a fastening section ( 28 ), a guide section ( 29 ), a piston section ( 30 ) and a head section ( 31 ). Idle valve ( 2 ) according to claim 1, characterized in that the diameters of fixing section ( 28 ), Leadership section ( 29 ) and piston section ( 30 ) are graded larger. Idle valve ( 2 ) according to claim 1, characterized in that the piston space ( 27 ) by seals ( 23a , b) which are inserted in grooves, wherein in each case at least one seal ( 23a , b) in the guide section ( 29 ) and in the piston section ( 30 ) is provided. Idle valve ( 2 ) according to claim 1, characterized in that the seal consists of a sealing package ( 23a , b), which is made in two parts, consisting of a sliding ring and an O-ring. Idle valve ( 2 ) according to claim 1, characterized in that the head section ( 31 ) has a flow-optimized contour, in particular may be a spherical, conical, parabolic or a combined contour. Idle valve ( 2 ) according to claim 1, characterized in that between lateral surface of the valve body ( 12 ) and sealing surface ( 26a ) a chamfer ( 32 ) is provided. Cylinder head ( 1 ) for a multi-stage reciprocating compressor for compressing a compressible working fluid, comprising an idling valve ( 2 ) according to one of claims 1 to 7, a cylinder top part ( 8th ), a cylinder base ( 6 ) and a separating plate ( 7 ), wherein the cylinder head ( 1 ) on a valve seat plate ( 9 ) with a mating surface ( 26b ) can be arranged. Cylinder head ( 1 ) according to claim 8, characterized in that the cylinder head ( 1 ) at least two idle valves ( 2a , b) or that per compressor stage ( 18 . 19 ) an idle valve ( 2a , b) is provided. Cylinder head ( 1 ) according to claim 8, characterized in that the spring ( 11 ) and / or the piston chambers ( 27 ) the individual idle valves ( 2a , b) are designed differently. Multi-stage piston compressor with a cylinder head ( 1 ) according to any one of claims 8 to 10.

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