Scroll compressor having a non-return valve

Abstract

The invention relates to an oil-free scroll compressor (2.1) for generating compressed air, comprising at least one spiral stator vane (6) that is arranged on a housing-mounted base plate (4), and a spiral impeller vane (10) that is arranged on an orbiting base plate (8), wherein the stator vane (6) and the impeller vane (10) axially engage with each other and define pressure chambers (12), wherein at least one outlet port (14) that is formed in the housing-mounted base plate (4) is fluidically connected (30) to a high-pressure chamber (30) via a non-return valve (16), said non-return valve (16) being disposed so as to open in the direction of the high-pressure chamber (30) and close in the opposite direction. In this scroll compressor, according to the invention, at least one cooling channel (22, 22') through which a cooling fluid can flow is formed in the region of the axially outer end face (9) of the housing-mounted base plate (4).

Description

[0001] Spiral compressor with a check valve

[0002] The invention relates to an oil-free spiral compressor for generating compressed air, comprising at least one spiral stator blade arranged on a housing-fixed base plate and a spiral displacement blade arranged on an orbitable base plate, wherein the stator blade and the displacement blade axially interlock and define pressure chambers, wherein at least one outlet opening is formed in the housing-fixed base plate, which is fluidically connected to a high-pressure chamber via a check valve, and wherein the check valve is arranged to open in the direction of the high-pressure chamber and to close in the opposite direction.

[0003] Spiral compressors, also known as helical compressors, are primarily used in stationary and mobile refrigeration units, heat pumps, and internal combustion engines to increase boost pressure. Due to their relatively quiet, smooth, and oil-free operation, spiral compressors are also increasingly used in compressed air generation systems for electrically or hybrid-powered commercial vehicles. A spiral compressor has at least one housing-mounted, spiral stator blade and one movable, spiral displacement blade, which define several pressure chambers. While the stator blade is attached to a housing-mounted base plate, the displacement blade is connected to an orbital base plate, which can be rotatably driven by an eccentric pin on a drive shaft.

[0004] With a rotating drive shaft, i.e., driven by a motor, the movable base plate, together with the displacer blade, performs a translational orbital motion to achieve high efficiency. It is deflected radially in accordance with the circumferential displacement of the drive shaft's eccentric pin, but largely maintains its circumferential orientation, thus preventing any pivoting around its own hub axis. The two blades are designed and arranged such that the displacer blade approaches the stator blade to within a few tenths of a millimeter in some areas. This ensures a relatively good seal for the pressure chambers, which, with a rotating drive shaft, shift circumferentially in the direction of rotation and radially from the outside inwards, reducing their volume.The translational orbital movement of the orbitable base plate is ensured by a guide device on the housing of the spiral compressor.

[0005] This document describes a scroll compressor with a housing-mounted base plate containing at least one outlet opening connected via a check valve to an axially adjacent high-pressure chamber. The high-pressure chamber, to which at least one compressed air consumer is connected, acts as a settling chamber. This chamber equalizes the pulsating compressed air flow and pressure present at the outlet opening of the housing-mounted base plate. The check valve prevents backflow of compressed air from the high-pressure chamber into the pressure chambers of the scroll compressor if the pressure in the high-pressure chamber is higher than in the pressure chamber adjacent to the outlet opening of the housing-mounted base plate.

[0006] From US Patent 6,695,598 B2, a scroll compressor is known whose housing-mounted base plate has an outlet opening which is connected via a check valve having a spring leaf body to an axially adjacent high-pressure chamber. The high-pressure chamber is bounded by the outer end wall of the housing-mounted base plate as well as by the bottom wall and the cylindrical side wall of a pot-shaped housing.

[0007] German patent DE 10 2019 204 866 A1 describes a scroll compressor for a vehicle air conditioning system, the housing-mounted base plate of which has an outlet opening that is connected in a similar manner to an axially adjacent high-pressure chamber via a check valve having a spring leaf body. In this scroll compressor, the high-pressure chamber is bounded by the outer end wall of the housing-mounted base plate, as well as by the bottom wall and a hollow cylindrical inner wall of a pot-shaped housing.

[0008] During extended operating phases and the generation of high gas pressures, comparatively high temperatures inevitably occur in a compressor, reducing its efficiency and potentially causing thermomechanical damage. This is particularly true when a scroll compressor forms the high-pressure stage of a two-stage compressor for compressed air generation, where the pressure in the pressure chamber adjacent to the outlet opening of the housing-mounted base plate exceeds 10 x 10 5 Pa can occur in conjunction with a correspondingly high temperature. It is therefore advantageous to arrange at least one cooling channel through which a coolant flows in the housing-mounted base plate for cooling purposes.

[0009] From US patent 7,942,655 B2, a spiral compressor is known in which a cooling channel for cooling the housing-fixed base plate is designed as an open annular groove and is formed in the axially inner end wall of a housing wall abutting the housing-fixed base plate.

[0010] In US 11,454,241 B2, a spiral compressor is described and illustrated in which a cooling channel for cooling the housing-fixed base plate is formed by straight diagonally or tangentially arranged grooves, which are separated from each other by webs and serially connected to each other at their ends by connecting lugs, wherein this meandering cooling channel is formed in the axially outer end face of the housing-fixed base plate.

[0011] Against this background, the invention is based on the objective of presenting a spiral compressor of the aforementioned design with a comparatively high mechanical stability and improved cooling device.

[0012] This problem is solved by a spiral compressor with the features of claim 1. Advantageous further developments are defined in the dependent claims.

[0013] The invention relates to an oil-free spiral compressor for generating compressed air, comprising at least one spiral stator blade arranged on a housing-fixed base plate and a spiral displacement blade arranged on an orbitable base plate, wherein the stator blade and the displacement blade axially interlock and define pressure chambers, wherein at least one outlet opening is formed in the housing-fixed base plate, which is fluidically connected to a high-pressure chamber via a check valve, and wherein the check valve is arranged to open towards the high-pressure chamber and to close in the opposite direction. According to the invention, this spiral compressor features at least one cooling channel through which a cooling fluid flows in the region of the axially outer end face of the housing-fixed base plate.

[0014] The invention is based on a known spiral compressor comprising at least one spiral stator blade arranged on a housing-fixed base plate and a spiral displacement blade arranged on a movable base plate, which axially interlock and define pressure chambers between them. The movable base plate can be driven by an eccentric pin of a drive shaft and, when the drive shaft is rotating, is guided in a translational orbital motion by means of a guide device. The housing-fixed base plate has an outlet opening for the generated compressed air, connected via a check valve to an axially adjacent high-pressure chamber.

[0015] Because at least one cooling channel through which a cooling fluid can flow is formed in the area of ​​the axially outer end face of the housing-mounted base plate, the housing-mounted base plate, the check valve and the high-pressure chamber can be cooled particularly effectively.

[0016] According to a first advantageous embodiment of the spiral compressor with the features of the invention, the cooling channel has a tubular geometry with at least one inlet-side and at least one outlet-side opening. Cool liquid coolant can be introduced into the cooling channel through the inlet-side opening and discharged, heated, through the outlet-side opening of the cooling channel. The tubular cooling channel can be manufactured relatively easily using a 3D metal printing process during the production of the housing-mounted base plate and the displacement blade arranged thereon.

[0017] Alternatively, the at least one cooling channel can be designed as an axially outwardly open groove in the axially outer end face of the housing-mounted base plate, wherein the cooling channel is sealed axially outwardly by a bottom wall of a cover housing of the scroll compressor. Sealing rings can be arranged between the bottom wall of the cover housing and the end face furthest from the displacer blades for the aforementioned sealing of the cooling channel. According to another embodiment, the at least one cooling channel can be designed as an axially outwardly open groove in the axially outer end face of the housing-mounted base plate, wherein this groove is sealed and covered by a groove cover arranged thereon to complete the cooling channel. This groove cover can have a flat, annular geometry and be welded, brazed, bonded, or otherwise pressure-tightly connected to the housing-mounted base plate.

[0018] The grooved cover has a largely flat geometry, roughly in the form of a flat cover plate, which is welded to the axially outer end face of the housing-mounted base plate. A separate cover housing is omitted to save costs.

[0019] Another alternative design of the scroll compressor involves forming the cooling channel in the axially outer face of the housing-mounted base plate by several axially outward-opening annular grooves. These grooves are connected at their ends, either parallel or in series, to allow the coolant to pass through, and are sealed axially outward by the bottom wall of the housing cover and / or a grooved cover. Sealing rings can also be used in this scroll compressor to seal the cooling channel.

[0020] It can also be advantageously provided that an axially open spiral groove is formed on the base plate side in the axially outer end face of the housing-fixed base plate, that an axially open spiral groove is formed on the bottom wall side of the cover housing in the axially inner end face, and that the two spiral grooves, with their axially open sides pointing towards each other, form a spiral cooling channel in the assembled state of the base plate and cover housing.

[0021] According to another embodiment, at least one axially open annular groove is formed on the base plate side of the axially outer end face, and at least one axially open annular groove is formed on the bottom wall of the cover housing on the axially inner end face. When the base plate and cover housing are assembled, these annular grooves, with their axially open sides facing each other, form an annular cooling channel. After assembly, the annular or spiral grooves can form a circular cooling channel cross-section. The annular grooves can be formed coaxially with each other in the axially outer end face of the base plate and in the bottom wall of the cover housing, connected to each other at their ends in parallel or series, and sealed by means of seals inserted into grooves in the base plate.

[0022] Accordingly, it is provided, for example, that the cooling channel in the housing-mounted base plate is extended by a spiral groove in the axially inner end face of the bottom wall of the cover housing, aligned with the spiral groove in the housing-mounted base plate, or by open annular grooves in the axially inner end face of the bottom wall of the cover housing, aligned with the annular grooves in the housing-mounted base plate. This increases the geometric cross-sectional area of ​​the cooling channel, or rather its coolant contact area, in the respective cooling channel, thereby increasing the cooling capacity without reducing the mechanical stability of the housing-mounted base plate. The cooling channel of the housing-mounted base plate can apparently be extended into the bottom wall of the cover housing in such a way that the coolant contact area is formed 50% to 80% in the cooling channel section of the housing-mounted base plate and 50% to 20% in the cooling channel section of the bottom wall of the cover housing.

[0023] Furthermore, according to another embodiment of the invention, the bottom wall of the cover housing may have a through-opening which is in flow communication with an outlet opening of the housing-mounted base plate, and the high-pressure chamber may be bounded by the bottom wall and a side wall of the cover housing as well as by a cover that seals against the axial end face of this side wall. This allows for a comparatively large-volume high-pressure chamber, and a grooved cover for covering the at least one cooling channel on the axially outer end face of the housing-mounted base plate is not necessary.

[0024] Furthermore, it may be provided that the open end of a comparatively small, pot-shaped high-pressure chamber housing is attached to the axial outer side of the housing-fixed base plate, that the open side of this high-pressure chamber housing facing the base plate is flow-connected to an outlet opening in the housing-fixed base plate, that a high-pressure chamber is formed through the interior of the high-pressure chamber housing and the outlet opening of the housing-fixed base plate, and that the high-pressure chamber housing has an outlet connection for attaching a compressed air line.

[0025] Finally, the cover housing can be designed with a radially outer, hollow cylindrical shell wall that radially and axially surrounds the housing-mounted base plate and the displacement vane attached to it, and that the shell wall of the cover housing is rigidly connected to the housing part of the spiral compressor. This improves the mechanical stability of the spiral compressor compared to other designs.

[0026] The invention is explained in more detail below with reference to several exemplary embodiments illustrated in the accompanying drawing. The drawing shows six figures, each in a partial longitudinal section through different embodiments of a spiral compressor incorporating the features of the invention.

[0027] The first embodiment of a spiral compressor 2.1, shown in partial detail in Fig. 1, has a housing-fixed base plate 4 with at least one axially projecting spiral stator blade 6 formed or attached to it, and a movable base plate 8 with at least one axially projecting spiral displacement blade 10 formed or attached to it. The stator blade 6 and the displacement blade 10 interlock axially and define pressure chambers 12 between them. The movable base plate 8 can be driven in a known manner by an eccentric pin of a drive shaft and, when the drive shaft is rotating, is guided in a translational orbital motion by means of a housing-side guide device.

[0028] The housing-fixed base plate 4 has an outlet opening 14 connected via a check valve 16 to an axially adjacent high-pressure chamber 30. The check valve 16 comprises a spring leaf element 18, a stop element 20, and a valve seat (not further specified). Both the housing-fixed base plate 4 and the orbitable base plate 8 each have at least one cooling channel 22, 22'; 24 through which a cooling fluid flows. The cooling channel is connected to an external heat exchanger (not shown). The housing-fixed base plate 4 is connected to a housing part 26 via a screw connection. Two screws 28 of this fastening device are visible in the sectional view of Fig. 1. The high-pressure chamber 30 is formed in a cover housing 32, which has a flat bottom wall 34, a radially outer hollow cylindrical shell wall 36, and a radially inner hollow cylindrical side wall 38.The bottom wall 34 of the cover housing 32 lies flush against the housing-mounted base plate 4 and is connected to it via a screw connection. In the sectional view of Fig. 1, four screws 42 of this screw connection are visible. Furthermore, the bottom wall 34 of the cover housing 32 has a passage opening 40 for generated compressed air, which is aligned with the outlet opening 14 of the housing-mounted base plate 4.

[0029] The outer wall 36 of the cover housing 32 radially surrounds the housing-fixed base plate 4, the stator blade 6 and the displacement blade 12. In addition, the outer wall 36 of the cover housing 32 is sealed against the housing part 26 by a sealing ring 46 inserted into an annular groove 44 of the housing part 26.

[0030] The high-pressure chamber 30 is bounded by the bottom wall 34 and the cylindrical side wall 38 of the cover housing 32, as well as by a cover 48 mounted axially on the outside of the side wall 38, and sealed by means of a flat gasket 54 arranged between the axially outer end face of the side wall 38 and the cover 48. The cover 48 is connected to the side wall 38 of the cover housing 32 via a screw connection. In the sectional view of Fig. 1, four screws 52 of this screw connection are visible. The cover 42 is also provided with an outlet port 50 to which a supply line leading to compressed air consumers can be connected.

[0031] The high-pressure chamber 30 is relatively large and acts as a settling chamber for compressed air or compressed gas, where the pulsating gas flow and pressure present at the outlet opening 14 of the housing-mounted base plate 4 are equalized. The check valve 16 prevents backflow of compressed gas into the pressure chamber 12 of the scroll compressor 2.1 when the gas pressure in the high-pressure chamber 30 is higher than in the pressure chamber 12 adjacent to the outlet opening 14 of the housing-mounted base plate 4. The flat bottom wall 34 of the cover housing 32, which rests against and is screwed to the housing-mounted base plate 4, stabilizes the housing-mounted base plate 4, which is subjected to high mechanical and thermal stresses during operation, and minimizes its elastic deformation.

[0032] The cooling channel 22 in the housing-mounted base plate 4 can be formed by a spirally wound, axially outwardly open spiral groove 62, which is formed in the axially outer end face 9 of the housing-mounted base plate 4. This cooling channel 22, or rather the spiral groove 62, is covered axially outwardly by the bottom wall 34 of the cover housing 32. To improve the sealing, circular grooves 64, 64a are formed in the housing-mounted base plate 4 in this embodiment, into which a circular seal 66, 66a is inserted in each groove.

[0033] Alternatively, the cooling channel 22' in the housing-fixed base plate 4 can also be formed by several axially outwardly open annular grooves 68, which are formed coaxially to each other in the axially outer end face 9 of the housing-fixed base plate 4, connected to each other at their ends in parallel or series, and covered axially outwardly by the bottom wall 34 of the cover housing 32. This cooling channel 22', also visible in Fig. 1, is sealed by means of seals 66, 66a inserted in grooves 64, 64a in the housing-fixed base plate 4.

[0034] In the second embodiment of a spiral compressor 2.2 according to the invention, shown in Fig. 2, the cooling channel 22, 22' in the housing-mounted base plate 4 is not sealed against coolant leakage by seals 66. Instead, the cooling channel 22, 22' is sealed by means of a flat, annular grooved cover 78, which is fastened in a recess 76 in the axially outer end face 9 of the housing-mounted base plate 4. The grooved cover 78 is welded, soldered, bonded, or otherwise pressure-tightly connected to the housing-mounted base plate 4, so that no coolant can escape from the cooling channel 22, 22'.

[0035] The third embodiment of a scroll compressor 2.3 shown in Fig. 3 differs from the scroll compressor 2.1 according to Fig. 1 in that the cooling channel 22, 22' in the housing-fixed base plate 4 is formed by an axially outwardly open spiral groove 62 in the housing-fixed base plate 4 and by an axially inwardly open spiral groove 80 on the axially inner end face 37 of the bottom wall 34 of the cover housing 32, aligned with this spiral groove 62. Alternatively, the cooling channel 22, 22' in the housing-fixed base plate 4 can be formed by axially outwardly open annular grooves 68 in the housing-fixed base plate 4 and axially inwardly open annular grooves 82 in the axially inner end face 37 of the bottom wall 34 of the cover housing 32, aligned with these annular grooves 82.

[0036] As illustrated in Figures 1 and 3, comparing the respective visible cross-sectional areas, the coolant contact surface can be configured as follows: 50% to 80% in the spiral groove 62 of the housing-fixed base plate 4 and 50% to 20% in the spiral groove 80 in the bottom wall 34 of the cover housing 32. The same applies to the embodiment with the annular grooves 68, 82.

[0037] Fig. 4 shows a fourth embodiment of a spiral compressor 2.4 with the features of the invention, in which a spiral cooling channel 90 or several annular cooling channels are formed in the housing-mounted base plate 4. This at least one cooling channel 90 is formed entirely in the material of the housing-mounted base plate 4 and has a tubular geometry as well as at least one inlet opening and at least one outlet opening for a cooling fluid. The cooling channel 90 is located relatively close to the axially outer end face 9 of the housing-mounted base plate 4 and thus, by definition, in the region of the axially outer end face 9 of the housing-mounted base plate 4.This arrangement of at least one tubular cooling channel 90 not only effectively cools the housing-mounted base plate 4 together with the stator blade 6 arranged there, but also indirectly cools the check valve 16, the cover housing 32 and the compressed air located in the high-pressure chamber 30.

[0038] The spiral compressor 2.5 shown in Fig. 5 according to the invention is designed as an embodiment in which its orbitable base plate 8 has no cooling channels 24.

[0039] Finally, Fig. 6 shows a spiral compressor 2.6 incorporating the features of the invention, in which, as in the spiral compressor 2.2 according to Fig. 2, the axially outwardly open at least one spiral groove or annular groove in the housing-fixed base plate 4 is covered liquid-tight by an annular groove cover 78. Instead of the cover housing 32, in this spiral compressor 2.6 according to Fig. 6, the open end of a cup-shaped high-pressure chamber housing 33 is attached to the axially outer end face 9 of the housing-fixed base plate 4. The axially inwardly open side of the high-pressure chamber housing 33, facing the base plate 4, thus forms a high-pressure chamber 31 in a very simple manner together with the outlet opening 14 of the housing-fixed base plate 4. This high-pressure chamber housing 33 also has an outlet connection 50 for connecting a compressed air line.

[0040] Reference symbol (part of the description)

[0041] Spiral compressor, (first embodiment)

[0042] Spiral compressor (second embodiment)

[0043] Spiral compressor (third embodiment)

[0044] Spiral compressor, (fourth embodiment)

[0045] Spiral compressor (fifth embodiment)

[0046] Spiral compressor, (sixth embodiment)

[0047] Housing-mounted base plate

[0048] Stator blade

[0049] Movable base plate

[0050] Axial outer end face of the housing-mounted base plate

[0051] Displacement bucket

[0052] Printing rooms

[0053] Exit opening

[0054] non-return valve

[0055] leaf spring body

[0056] Stop body, 22' cooling channel

[0057] Cooling channel

[0058] Housing part

[0059] screws

[0060] High-pressure chamber in the lid housing 32

[0061] High-pressure chamber in high-pressure chamber housing 33

[0062] Lid housing

[0063] High-pressure chamber housing

[0064] bottom wall of the lid housing 32

[0065] Shell wall of the lid housing 32

[0066] Axial inner end face of the bottom wall 34 of the lid housing 32

[0067] Side wall of the lid housing 32

[0068] Passage opening in the bottom wall 34 of the cover housing 32

[0069] screws

[0070] Ring groove

[0071] seal

[0072] Cover output port

[0073] screws

[0074] Flat gasket

[0075] Ring groove

[0076] Spiral groove, 64a grooves, 66a seals

[0077] Ring grooves

[0078] Recess in the end wall of the housing-mounted base plate

[0079] Grooved lid

[0080] spiral groove

[0081] Ring grooves

Claims

Patent claims 1. Oil-free operable scroll compressor (2.1, 2.2, 2.3, 2.4, 2.5, 2.6) for generating compressed air, comprising at least one spiral stator blade (6) arranged on a housing-fixed base plate (4) and a spiral displacement blade (10) arranged on an orbitable base plate (8), wherein the stator blade (6) and the displacement blade (10) axially interlock and define pressure chambers (12), wherein at least one outlet opening (14) is formed in the housing-fixed base plate (4), which is fluidically connected to a high-pressure chamber (30) via a check valve (16), and wherein the check valve (16) is arranged to open in the direction of the high-pressure chamber (30) and to close in the opposite direction, characterized in that at least one of a cooling channel (22, 22', 90) through which a coolant can flow.

2. Spiral compressor (2.4, 2.5) according to claim 1 , characterized in that the cooling channel (90) has a tubular geometry with at least one inlet-side opening and at least one outlet-side opening.

3. Spiral compressor (2.2, 2.6) according to claim 1 , characterized in that the cooling channel (22, 22') is formed as at least one axially outwardly open groove in the axially outer end face (9) of the housing-fixed base plate (4), which is sealed and covered by a groove cover (78).

4. Spiral compressor (2.2, 2.6) according to claim 3, characterized in that the groove cover (78) has a largely flat, ring-shaped geometry.

5. Spiral compressor (2.1 , 2.3) according to claim 1 , characterized in that the cooling channel (22, 22') is formed as at least one axially outwardly open groove in the axially outer end face (9) of the housing-fixed base plate (4), which is sealed and covered by a bottom wall (34) of a cover housing (32) of the spiral compressor (2.1 , 2.3).

6. Spiral compressor (2.1 , 2.2, 2.3, 2.6) according to one of the preceding claims, characterized in that the cooling channel (22, 22') is located in the axially outer end face (9) of the housing- The fixed base plate (4) is formed by several axially outwardly open annular grooves (68) which are connected to each other at their ends in parallel or in series, and which are sealed axially outwardly by the bottom wall (34) of the cover housing (32) and / or by a groove cover (78).

7. Spiral compressor (2.3) according to one of claims 1 to 6, characterized in that an axially open spiral groove (62) is formed in the axially outer end face (9) of the housing-fixed base plate (4), that an axially open spiral groove (80) is formed in the axially inner end face (37) of the bottom wall (34) of the cover housing (32), and that the two spiral grooves (62, 80) with their axially open sides facing each other form a spiral cooling channel (22') in the assembled state of the base plate (4) and cover housing (32).

8. Spiral compressor (2.3) according to one of claims 1 to 6, characterized in that an axially open base plate-side annular groove (68) is formed in the axially outer end face (9) of the housing-fixed base plate (4), that an axially open base plate-side annular groove (82) is formed in the axially inner end face (37) of the bottom wall (34) of the cover housing (32), and that the two annular grooves (68, 82) with their axially open sides facing each other form an annular cooling channel (22) in the assembled state of base plate (4) and cover housing (32).

9. Spiral compressor (2.3) according to claim 7 or 8, characterized in that the coolant contact surface is formed to 50% to 80% in the axial cooling channel section of the housing-fixed base plate (4) and to 50% to 20% in the axial cooling channel section of the bottom wall (34) of the cover housing (32).

10. Spiral compressor (2.1 , 2.2, 2.3, 2.4, 2.5) according to one of the preceding claims, characterized in that the bottom wall (34) of the cover housing (32) has a through-opening (40) in flow communication with the outlet opening (14) of the housing-fixed base plate (4), and that the high-pressure chamber (30) is bounded by the bottom wall (34) and a side wall (38) of the cover housing (32) as well as by a cover (48) sealed onto the axial end face of this side wall (38).

11. Spiral compressor (2.1 , 2.2, 2.3, 2.4, 2.5) according to one of claims 1 to 10, characterized in that the cover housing (32) has a hollow cylindrical shell wall (36) has a radial and axially encompassing the housing-fixed base plate (4) and the displacement vane (10) arranged thereon, and that the shell wall (36) of the cover housing (32) is firmly connected to a housing part (26) of the spiral compressor.

12. Spiral compressor (2.6) according to one of claims 1 to 10, characterized in that the open end of a cup-shaped high-pressure chamber housing (33) is attached to the axially outer end face (9) of the housing-fixed base plate (4), that the side of the high-pressure chamber housing (33) facing the base plate (4) is flow-connected to the outlet opening (14) of the housing-fixed base plate (4), that a high-pressure chamber (31) is formed through the interior of the high-pressure chamber housing (33) and the outlet opening (14) in the housing-fixed base plate (4), and that the high-pressure chamber housing (33) has an outlet connection (50) for connecting a compressed air line.

Images