Piston compressor, in particular radial piston compressor

Abstract

The invention relates to a piston compressor, in particular a radial piston compressor, comprising - at least two piston-working chamber combinations (1a-g), wherein - each piston-working chamber combination has at least one fluid inlet channel (11a-g) and one fluid outlet channel (12a-g), wherein - the at least one fluid inlet channel (11a-g) is fluidically connected to a low-pressure collection volume (ND) and / or the at least one liquid outlet channel (12a-g) is fluidically connected to a high-pressure collection volume (HD), wherein - the low-pressure collection volume (ND) comprises a first part collection volume (ND1) and at least one second part collection volume (ND2), wherein the first part collection volume and the second part collection volume are fluidically connected together via a first overflow channel (NDÜ1) and at least one second overflow channel (NDÜ2), and / or - the high-pressure collection volume (HD) comprises a first part collection volume (HD1) and at least one second part collection volume (HD2), wherein the first part collection volume and the second part collection volume are fluidically connected together via a first overflow channel (HDÜ1) and at least one second overflow channel (HDÜ2).

Description

[0001] The present invention relates to a piston compressor, in particular a radial piston compressor, according to the preamble of claim 1 or claim 2.

[0002] A piston compressor is a component of fluid technology. In a radial piston compressor, the piston-working chamber combinations are arranged radially and perpendicular to the drive shaft, unlike an axial piston compressor. The delivery or reciprocating movement of each individual working piston is usually caused by an eccentric located on the drive shaft. Piston compressors, especially radial piston compressors, typically comprise several piston-working chamber combinations that extend radially from the drive shaft in a star-shaped pattern. The radial piston compressor pumps a fluid from a low-pressure region to a high-pressure region.

[0003] Piston compressors are used, for example, as compressors for coolants in air conditioning systems of motor vehicles, especially in electrically powered vehicles.

[0004] Refrigerant compressors that operate according to the piston principle usually have two collecting volumes from which the sucked in low-pressure gas (low-pressure area / ND) is fed and into which the compressed high-pressure gas (high-pressure area / HD) is expelled.

[0005] Both collection volumes can be routed, for example, in ducts (ring ducts or similar). The discontinuous suction at the inlet duct or inlet valve and the discharge at the outlet duct or outlet valve generate pressure pulsations in the respective collection volume, which can propagate into the refrigerant circuit via the internal ducts and the compressor connections. Excessively high pulsation levels can lead to the emission of disturbing noise into the passenger compartment, for example, via the heat exchangers.

[0006] For this purpose, DE 11 2010 000 920 T5, for example, proposes a piston refrigerant compressor having a refrigerant intake chamber and a refrigerant discharge chamber, as well as a refrigerant distribution device having a distribution line and bypass lines connecting the distribution line and the intake chambers of the compressor units. Furthermore, a refrigerant discharge device is provided having a discharge line and bypass lines connecting the discharge line and the discharge chambers of the compressor units. The piston refrigerant compressor proposed here is characterized in particular in that the compressor further comprises pressure equalization means designed to connect the intake chambers of at least two compressor units and / or the discharge chambers of at least two compressor units.

[0007] A piston compressor having the features of the preamble of claim 1 is known, for example, from JPS 63 100 681 U. A piston compressor having the features of the preamble of claim 2 is known, for example, from US 4 988 269 A or DE 100 03 882 A1.

[0008] Although a viable solution is already presented here to provide a piston refrigerant compressor with a simple and economical structure, while at the same time avoiding the occurrence of pressure pulsations that could reduce the compressor's performance, there is still room for improvement, particularly with regard to a simple and economical structure.

[0009] The object of the present invention is therefore to propose an improved piston compressor, in particular to propose a piston compressor that can be manufactured more simply and economically.

[0010] According to the invention, this object is achieved by the characterizing features of claim 1 in that the low-pressure collection volume comprises a first partial collection volume and at least one second partial collection volume, wherein the first partial collection volume and the second partial collection volume are fluidically connected to one another via a first overflow channel and at least one second overflow channel.

[0011] Alternatively or additionally, this object is also achieved with the characterizing features of claim 2 in that the overflow channels in the high-pressure collection volume are arranged such that they are at the same distance from the high-pressure outlet channel, or the fluid from both passages takes the same path. It has been shown that maintaining the same distance can achieve a significant reduction in pulsation in many applications.

[0012] In other words, it is preferably provided that the intake and / or discharge collection volumes are each divided into two parts, so that the fluid flows through both partial collection volumes of the low-pressure collection volumes before intake and / or both partial collection volumes of the high-pressure collection volumes after compression. The transfer of fluid between the partial collection volumes is achieved by means of overflow channels. The two partial collection volumes are fluidically connected to one another by means of the overflow channels. "Fluidically connected" here means that the fluid can flow through the respective channels, in particular from one partial collection volume to the other.

[0013] In the first partial collection volume, the pulsations can spread and be dampened or even eliminated. The transition channels and the partial volumes are preferably dimensioned such that a pulsation at the valve or inlet or outlet channel cannot continue into the second partial collection volume, or can only continue to be dampened to the desired extent. In principle, this works for both the low-pressure and the high-pressure range, so it need not be referred to separately here. However, the reduction in pulsation is particularly relevant for the high-pressure range. Which damping (which order of the excited oscillation) is to be eliminated or dampened can be individually determined and defined by the dimensions / arrangement of the first partial collection volume, the second partial collection volume, and the transfer channels.

[0014] Further advantageous embodiments of the proposed invention emerge in particular from the features of the subclaims. The subject matter and features of the various claims can, in principle, be combined with one another in any desired way.

[0015] In an advantageous embodiment of the invention, the piston-working chamber combinations can each comprise a piston and a working chamber, with the piston-working chamber combinations being arranged radially around a drive shaft. A piston compressor configured in this way, in particular a radial piston compressor, is particularly advantageously suited for the proposed invention.

[0016] In a further advantageous embodiment of the invention, the piston compressor can comprise a housing for accommodating the piston-working chamber combinations and a removable cover. The piston-working chamber combinations can advantageously be accommodated via the housing or partially formed from the housing.

[0017] In a further advantageous embodiment of the invention, the partial collection volumes can be designed in an annular manner, wherein the partial collection volumes are arranged, in particular, adjacent to one another and / or in a plane. An annular configuration of the partial collection volumes, preferably coaxial around the longitudinal axis, offers a space-saving design of the collection volumes. In particular, the partial collection volumes can be nested within one another and / or housing components can be used for their formation.

[0018] In a further advantageous embodiment of the invention, a separating element can be arranged between the partial collection volumes, with the overflow channels arranged in the separating element. A separate separating element enables simple design and positioning of the overflow channels. Furthermore, different materials can be used for the separating element, which can perform application-specific functions, for example, sealing with a sealing material, forming the overflow channels with metal inserts, etc.

[0019] In a further advantageous embodiment of the invention, the separating element can be provided with a separating region and a sealing region. These regions can be designed accordingly, depending on the requirements of the separating element.

[0020] In a further advantageous embodiment of the invention, it can be provided that the low-pressure collection volume, in particular the first partial collection volume, is equipped with a low-pressure inlet, wherein the high-pressure collection volume, in particular the second partial collection volume, is equipped with a high-pressure inlet, wherein the low-pressure inlet is arranged offset in the circumferential direction, in particular offset by 90°, to the overflow channels of the low-pressure collection chamber and / or the high-pressure outlet is arranged offset in the circumferential direction, in particular offset by 90°, to the overflow channels of the high-pressure collection chamber. It has been shown that a good reduction in pulsation can be achieved in many applications by offsetting by 90°.

[0021] In a further advantageous embodiment of the invention, the position and number of overflow channels can be designed and arranged according to possible resonant pressure oscillations. This allows for the best possible counteracting of pulsation.

[0022] In a further advantageous embodiment of the invention, the outlet valves and / or the fluid outlet channels can be arranged axially or radially to the longitudinal axis of the piston compressor. In principle, the invention can be used with both radially and axially aligned outlet valves or fluid outlet channels.

[0023] In a further advantageous embodiment of the invention, the separating element can be made of different materials, in particular, the separating element can be made of sealing material and vulcanized overflow channels. In this way, the separating element can be optimally adapted to the respective application.

[0024] In a further advantageous embodiment of the invention, the separating element can be designed as an insertable component, in particular one that can be fixed in the collecting volume or fixed to the housing. Accordingly, advantages can be achieved, for example, during assembly of the piston compressor.

[0025] In a further advantageous embodiment of the invention, it can be provided that the high-pressure collection volume and / or the low-pressure collection volume are formed or composed of at least two, preferably several, components of the piston compressor, in particular housing components of the piston compressor. This allows housing components to be used to form the respective or both collection volumes.

[0026] Further features and advantages of the present invention will become clear from the following description of preferred embodiments with reference to the accompanying drawings. Fig. 1 Mass flow and its pulsation in the HP range of a 7-cylinder piston compressor, in particular a refrigerant compressor, according to the prior art; Fig. 2 Details of a piston compressor according to the prior art in a sectional side view; Fig. 3 A schematic representation of the high-pressure collection volume of a piston compressor according to the invention; Fig. 4 A schematic representation of the low-pressure collection volume of a piston compressor according to the invention; Fig. 5 A schematic representation of the high-pressure collection volume or the low-pressure collection volume of a piston compressor according to the invention in an alternative embodiment; Figs. 6-11 Details of a piston compressor according to the invention in a sectional side view; Fig. 12 Details of a piston compressor according to the invention in a sectional side view; Fig. 13 Details of a piston compressor according to the invention in a sectional side view; Fig.Fig. 14 shows details of a piston compressor according to the invention in a sectional side view; Fig. 15 shows a cover of a piston compressor according to the invention in a plan view; Fig. 16 shows a piston compressor according to the invention in a cross-sectional view; Fig. 17 shows a piston compressor according to the invention in a sectional plan view.

[0027] The following reference symbols are used in the figures: Longitudinal axis HDHigh-pressure collection volume NDLow-pressure collection volume HDA high-pressure outlet NDEL low-pressure inlet HD1first partial collection volume (high pressure) HD2second partial collection volume (high pressure) ND1first partial collection volume (low pressure) ND2second partial collection volume (low pressure) HDÜ1first overflow channel (HD) HDÜ2second overflow channel (HD) NDÜ1first overflow channel (ND) NDÜ2second overflow channel (HD) 1 (ag)Piston-working chamber combination 2Drive shaft, especially eccentric shaft 3Housing 4Cover 5Separator 6Electric motor 11 (ag)Fluid inlet channel 12 (ag)Fluid outlet channel 13Piston 14Working chamber 51Separation area 52Sealing area 111Fluid inlet valve 121Fluid outlet valve

[0028] Features and details described in connection with a method naturally also apply in connection with the device according to the invention, and vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is always made to each other. Furthermore, a method according to the invention that may be described can be carried out with the device according to the invention.

[0029] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a" and "an" are intended to include the plural forms unless the context clearly indicates otherwise. It will also be understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of the recited features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed elements.

[0030] The following will first focus on Fig. 1 Reference is made.

[0031] In the Fig. 1 A diagram is shown regarding mass flow and its pulsation in the high pressure range of a 7-cylinder piston compressor, in particular a refrigerant compressor, according to the state of the art.

[0032] The following refers to Fig. 2Reference is made here. Using the example of a high-pressure collection volume HD, it is shown and explained that such a high-pressure collection volume HD can be designed as a separate line / pipe and / or on / with compressor components. A recess, e.g. in the form of a groove, is provided in at least one housing part of the piston compressor. When the piston compressor is assembled, this housing part, e.g. a housing cover, is brought into contact with another housing part, thereby forming a channel, e.g. the high-pressure collection volume. The high-pressure collection volume HD can thus be composed of various sub-regions formed on various components of the piston compressor. The tightness is preferably achieved by components lying against one another or by means of two seals.

[0033] The following refers to Fig. 16 and Fig. 17 Reference is made.

[0034] A piston compressor according to the invention essentially comprises at least two, preferably seven, piston-working chamber combinations 1a-g, as well as a low-pressure collection volume ND and / or a high-pressure collection volume HD. The piston-working chamber combinations each comprise a working chamber 14 and a piston 13. The pistons 13 can be controlled, for example, via a drive shaft 2, in particular an eccentric shaft. An electric motor 6, for example, can be used as the drive for the piston compressor. However, an indirect drive via an internal combustion engine of a motor vehicle is also conceivable. The piston compressor preferably comprises a housing 3, in which, for example, the piston-working chamber combinations 1a-g are formed or accommodated. This housing 3 is preferably closed at the end with a removable cover 4. The drive shaft 2 has a longitudinal axis L.

[0035] The piston-working chamber combinations 1a-g each have a fluid inlet channel 11a-g, each with a fluid inlet valve 111, and a fluid outlet channel 12a-g, each with a fluid outlet valve 121. The fluid inlets 11a-g are generally connected to the low-pressure collection volume ND, and the fluid outlet channels 12a-g are generally connected to the high-pressure collection volume HD. The piston compressor can generally be part of an air conditioning system. The role of the piston compressor and the other components of an air conditioning system are well known to those skilled in the art and require no further explanation here.

[0036] It is provided that the low-pressure collection volume ND comprises a first partial collection volume ND1 and a second partial collection volume ND2, wherein the first partial collection volume ND1 and the second partial collection volume ND2 are fluidically connected to one another via a first overflow channel NDÜ1 and at least one second overflow channel NDÜ2 and / or the high-pressure collection volume HD comprises a first partial collection volume HD1 and at least one second partial collection volume HD2, wherein the first partial collection volume HD1 and the second partial collection volume HD2 are fluidically connected to one another via a first overflow channel HDÜ1 and at least one second overflow channel HDÜ2.

[0037] The fluid, in particular a refrigerant, basically flows from the low-pressure collection volume ND, in particular from the first partial collection volume ND1 via the overflow channels NDÜ1 or NDÜ2 into the second partial collection volume ND2, via the fluid inlet channels 11a-g or the fluid inlet valve 111 into the working chamber 14, is compressed there and is guided via the fluid outlet valve 121 or the fluid outlet channels 12a e into the high-pressure collection volume HD, in particular into the first partial collection volume HD1 and then into the second partial collection volume HD2.

[0038] In the following, particular attention is paid to the Figs. 3 and 4 Reference is made.

[0039] For better illustration, a high-pressure collecting volume of a piston compressor according to the invention is shown in the Fig. 3 shown cut out.

[0040] It is preferably provided that the partial collection volumes HD1 and HD2 are designed in annular form, in particular as annular channels.

[0041] It is further apparent or provided that the fluid outlet channels 12a-g of the respective piston-working chamber combinations 1a-g open into the first partial collection volume HD1. In the present example, seven piston-working chamber combinations 1a-g are provided, so that a first to seventh fluid outlet channel 12a to 12g open into the first partial collection volume HD1. In principle, any number of piston-working chamber combinations can be provided, or their fluid outlet channels can open into the high-pressure collection volume, in particular its first partial collection volume HD1.

[0042] It is further apparent or intended that the second partial collection volume HD2 is equipped with a high-pressure outlet channel HDA. The compressed fluid exits the piston compressor from this high-pressure outlet channel HDA and is fed, for example, to a circuit of an air conditioning system.

[0043] In one embodiment of the invention, it is provided that the overflow channels HDÜ1 and HDÜ2 are arranged such that they are at the same distance from the high-pressure outlet channel HDA or the fluid from both passages has the same path. Fig. 3 For example, 90° angles are provided around the circumference to the overflow channels HDÜ1 and HDÜ2. Other oscillations or frequencies of the fluid pulsation to be damped in the high-pressure collection volume HD may require a different arrangement of the high-pressure outlet channel HDA, which can be achieved, in particular, through simulation and / or calculation. Furthermore, the simulation or calculation may show that more than two overflow channels are required.

[0044] In principle, the structure of the low-pressure collection volume can be identical or at least similar to the high-pressure collection volume. For the sake of completeness, Fig. 4which represents a low-pressure collection volume, which is also shown cut out for better illustration.

[0045] It can be seen or intended that the fluid inlet channels 11a-g of the respective piston-working chamber combinations 1a-g open into the second partial collection volume ND2. In the present example, seven piston-working chamber combinations are provided, so that a first to seventh fluid inlet channel opens into the second partial collection volume ND2. In principle, any number of piston-working chamber combinations can be provided, or their fluid inlet channels can open into the low-pressure collection volume, in particular its first partial collection volume ND1.

[0046] It is further apparent or provided that the first partial collection volume ND1 is equipped with a low-pressure inlet channel NDE. The fluid enters the first partial collection volume ND1 via this low-pressure inlet channel NDE and is fed via the overflow channels NDÜ1 and NDÜ2 to the second partial collection volume ND2 and ultimately via the fluid inlet channels 11a-g to the working chambers of the piston-working chamber combinations 1a-g.

[0047] It is further preferably provided that the overflow channels NDÜ1 and NDÜ2 are arranged such that they have the same distance from the low-pressure inlet channel NDE or the fluid from both overflow channels NDÜ1 and NDÜ2 has the same path. Fig. 4For example, 90° are provided on the circumference to the overflow channels NDÜ1 and NDÜ2. Other vibrations or frequencies of the fluid pulsation to be damped in the low-pressure collection volume ND may require a different arrangement of the low-pressure inlet channel NDE, which can be achieved, in particular, by simulation and / or calculation.

[0048] In the Fig. 5For example, an alternative design of a two-part collection volume, in particular a low-pressure collection volume or a high-pressure collection volume, is shown. Both reference symbols HD and ND are inserted here solely for illustrative purposes. While in the examples shown above, the partial collection volumes ND1 and ND2 or HD1 and HD2 are arranged axially next to one another, a coaxial arrangement is also conceivable, in which the partial collection volumes ND1 and ND2 or HD1 and HD2 are arranged in one plane. With a correspondingly annular design of the partial collection volumes ND1 and ND2 or HD1 and HD2, the partial collection volumes have different diameters.

[0049] It can also preferably be provided that the partial collection volumes, in particular the high-pressure collection volume and / or the low-pressure collection volume, are formed or composed of at least two, preferably several components of the piston compressor, in particular housing components of the piston compressor. For example, the second partial collection volume ND2 or HD2 is formed in the cover 4, while the first partial collection volume ND1 or HD1 is formed in the housing. In principle, however, two adjacent and detachable compressor components are suitable for forming the collection volumes.

[0050] It may furthermore preferably be provided that the first partial collection volume and the second collection volume are separated from one another by a separating element 5, in particular a seal, in particular a flat seal, wherein the overflow channels are provided in the separating element 5. The material of the separating element 5 can be, for example, a sheet metal seal, but in principle, any other sealing material can also be used.

[0051] In principle, it can preferably be provided that the collection volume is designed in such a way that the separation can be carried out by means of a separate separating element 5.

[0052] The advantages resulting from the separating element 5 are, in particular, a design that is space-neutral or at least requires minimal installation space, especially compared to an external collection volume. Furthermore, no additional parts, or at least no externally mounted components / assemblies, are required. Additional processing steps can advantageously be eliminated. Throttling points can be avoided. Thus, there are hardly any thermodynamic losses and no risk of clogging of fine geometries. There are essentially no moving or flexible parts. This allows for maximum robustness.

[0053] Further details of the present invention emerge in particular from the Fig. 6 to 15 .

[0054] In the Fig. 6A detail of a piston compressor according to the invention is shown. It can be seen in particular that the partial collection volumes HD1 and HD2 are separated by a separating element 5. The resulting arrangement of the partial volumes HD1 and HD2 corresponds in principle to that shown in Figure 3 arrangement shown separately.

[0055] In the Fig. 7 to 9 In particular, different designs of the separating element 5 are shown.

[0056] In the Figs. 10 and 11 In particular, different designs of an overflow channel HDÜ1 and HDÜ2 in a separating element 5 are shown.

[0057] In the Fig. 12 a detail of a piston compressor according to the invention, in particular an axially aligned fluid outlet channel 12, is shown.

[0058] In the Fig. 13 a detail of a piston compressor according to the invention, in particular a radially aligned fluid outlet channel 11, is shown.

[0059] In the Fig. 14 A detail of a piston compressor according to the invention is shown, in particular the first partial collection volume HD1 and the second partial collection volume HD2 in the high-pressure range with radial alignment of the fluid outlet channel 12 and axial arrangement or separation of the collection volume HD. The resulting arrangement of the partial volumes HD2 corresponds in principle to that in Figure 3 partial volume arrangement shown separately.

[0060] In the Fig. 12 to 14 It is also particularly evident that the collection volume HD, in particular the partial collection volumes HD1 and HD2, can be formed by recesses in the housing 3, in particular the cylinder housing, and the cover 4 of the piston compressor.

[0061] In the Fig. 15A separating element 5 for a piston compressor according to the invention is shown. In particular, a separating region 51 can be seen here, which separates the two partial collection volumes from each other, as well as a sealing region 52, which essentially seals the collection volumes or the components, such as the housing 3 and cover 4, in this region.

[0062] The present invention may be characterized by further preferred features.

[0063] It can be provided that the outlet valve(s) 121 and / or the outlet channel(s) 12 are arranged axially or radially to the longitudinal axis L of the piston compressor.

[0064] It can be provided that the separating element 5 comprises different materials; in particular, it can be provided that the separating element 5 has a separating region 51 and a sealing region 52. In this context, it can advantageously be provided that the overflow channels HDÜ1, HDÜ2, NDÜ1, NDÜ2 consist of a different material than the sealing region 52 of the separating element 5. The overflow channel(s) HDÜ1, HDÜ2, NDÜ1, NDÜ2 can, for example, be vulcanized.

[0065] It can be provided that the separating element 5 is designed as an insertable component, in particular fixable in the collecting volume HD or ND or fixable to the housing 3.

[0066] The position and number of the HPÜ or LPÜ overflow channels can be designed and arranged according to possible resonant pressure oscillations. Depending on the dominant pulsation, the number and position of the HPÜ or LPÜ overflow channels can / should be varied to optimize the absorption behavior. It is advantageous to position the HPÜ overflow channels in the high-pressure collection volume 90° circumferentially upstream or downstream of the high-pressure outlet HPA and / or to position the LPÜ overflow channels in the high-pressure collection volume 90° circumferentially upstream or downstream of the low-pressure outlet NDA.

[0067] The collecting duct design according to the invention can basically be used in the intake and discharge tract of all types of compressors.

[0068] The piston compressor according to the invention can be designed so that the resonance in the collecting volume can increase the sound pressure.

[0069] The collecting channel design according to the invention can be designed, in particular optimized, depending on the speed, pressure level, number of pistons, and valve characteristics.

[0070] The piston compressor according to the invention can be designed such that the overflow channels NDÜ or HDÜ are optimized from the first partial collection volume HD1 or ND1 into the second partial collection volume HD2 or ND2.

[0071] It can preferably be provided that the overflow channels NDÜ and HDÜ are designed as two diametrical bores with the same running width to the low-pressure inlet NDE and the high-pressure outlet HDA.

[0072] It can preferably be provided that a circulating discharge from the working spaces 14 into the first partial collection volume HD1 of the high-pressure collection volume HD takes place.

Claims

1. Piston compressor, in particular radial piston compressor, comprising - at least two piston-working chamber combinations (1a-g), wherein - each piston-working chamber combination has at least one fluid inlet channel (11a-g) and one fluid outlet channel (12a-g), wherein - the at least one fluid inlet channel (11a-g) is fluidically connected to a low-pressure collection volume (ND), characterized in that - the low-pressure collection volume (ND) comprises a first partial collection volume (ND1) and at least one second partial collection volume (ND2), wherein the first partial collection volume and the second partial collection volume are fluidically connected to one another via a first overflow channel (ND1) and at least one second overflow channel (ND2)2. Piston compressor, in particular radial piston compressor, comprising - at least two piston-working chamber combinations (1a-g), wherein - each piston-working chamber combination has at least one fluid inlet channel (11a-g) and one fluid outlet channel (12a-g), wherein - the at least one fluid outlet channel (12a-g) is fluidically connected to a high-pressure collecting volume (HD), wherein - the high-pressure collection volume (HD) comprises a first partial collection volume (HD1) and at least one second partial collection volume (HD2), the first partial collection volume and the second partial collection volume being fluidically connected to one another via a first overflow channel (HDÜ1) and at least one second overflow channel (HDÜ2), characterized in that the overflow channels (HDÜ1 and HDÜ2) in the high-pressure collection volume are arranged in such a way that they are at the same distance from the high-pressure outlet channel (HDA) or the fluid travels the same distance from both passages.

3. Piston compressor according to claim 1 or 2, characterized in that the piston-working chamber combinations (1a-g) each comprise a piston (13) and a working chamber (14), the piston-working chamber combinations (1a-g) being arranged radially around a drive shaft (2).

4. Piston compressor according to at least one of the preceding claims, characterized in that the piston compressor comprises a housing (3) for accommodating the piston-working chamber combinations (1a-g) and a removable cover (4).

5. Piston compressor according to at least one of the preceding claims, characterized in that the partial collection volumes (ND1 and ND2 and / or HD1 and HD2) are annular in shape, the partial collection volumes being arranged in particular next to one another and / or in one plane.

6. Piston compressor according to at least one of the preceding claims, characterized in that a separating element (5) is arranged between the partial collecting volumes (ND1 and ND2 and / or HD1 and HD2), the overflow channel (NDÜ1, NDÜ2 or HDÜ1, HDÜ2) being arranged in the separating element (5).

7. Piston compressor according to claim 6, characterized in that the separating element (5) comprises a separating region (51) and a sealing region (52).

8. Piston compressor according to claim 1, characterized in that the low-pressure collecting volume (ND), in particular the first partial collecting volume (ND1), is equipped with a low-pressure inlet (NDE), the low-pressure inlet (NDE) being arranged offset in the circumferential direction, in particular offset by 90°, relative to the overflow channel (NDÜ1, NDÜ2) of the low-pressure collecting chamber (ND)9. Piston compressor according to claim 2, characterized in that the high pressure collecting volume (HD), in particular the second partial collecting volume (HD2), is equipped with a high pressure outlet (HDA), the high pressure outlet (HDA) being arranged offset in the circumferential direction, in particular offset by 90°, relative to the overflow channel (HDÜ1, HDÜ2) of the high pressure collecting chamber (HD).

10. Piston compressor according to claim 1, characterized in that the overflow channels (NDÜ1 or NDÜ2) are arranged in the low-pressure collecting volume in such a way that they are at the same distance from the low-pressure inlet channel (NDE) or the fluid travels the same distance from both passages.

11. Piston compressor according to at least one of the preceding claims, characterized in that the position and number of the overflow channels (NDÜ1, NDÜ2 or HDÜ1, HDÜ2) are designed or arranged in accordance with possible resonant pressure oscillations.

12. Piston compressor according to at least one of the preceding claims, characterized in that the fluid outlet channel (12a-g) are arranged axially or radially to the longitudinal axis (L) of the piston compressor.

13. Piston compressor according to at least one of the preceding claims, characterized in that the separating element (5) comprises different materials, in particular in that the separating element (5) comprises sealing material and vulcanized-on overflow channels (NDU or HDÜ).

14. Piston compressor according to claim 6 or 7, characterized in that the separating element (5) is designed as an insertable component, in particular fixable in the collection volume (ND or HD) or fixable to the housing (3).

15. Piston compressor according to claim 1, characterized in that the low-pressure collecting volume (ND) is formed or composed by at least two, preferably several components of the piston compressor, in particular housing components, such as housing (3) and cover (4), of the piston compressor.

16. Piston compressor according to claim 2, characterized in that the high-pressure collecting volume (HP) is formed or composed by at least two, preferably several components of the piston compressor, in particular housing components, such as housing (3) and cover (4), of the piston compressor.

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