WO2020161153A1

WO2020161153A1 - Cylinder head for piston compressor

Info

Publication number: WO2020161153A1
Application number: PCT/EP2020/052794
Authority: WO
Inventors: Roland Cesak; Paul KNOFE; Markus Ertl
Original assignee: Hoerbiger Wien Gmbh
Priority date: 2019-02-06
Filing date: 2020-02-05
Publication date: 2020-08-13
Also published as: AT521496A4; EP3921542A1; CN113439161A; US20220120265A1; JP2022520757A; AT521496B1

Abstract

The invention relates to a cylinder head (1) for a piston compressor (3), which is intended to provide the most flexible arrangement possible of said piston compressor (3) without needing to make any structural modifications to the piston compressor (3), particularly to the cylinder head (1). According to the invention, to achieve this the intake connection (14) and/or the pressure connection (13) are designed to be adjustable into at least two positions on the cylinder head (1).

Description

Cylinder head for piston compressor

The invention relates to a cylinder head for a reciprocating compressor, with a suction chamber and a pressure chamber spatially separated therefrom, a suction connection communicating with the suction chamber for supplying a suction port on the cylinder head

Compression medium and a pressure connection communicating with the pressure chamber for discharging compressed compression medium are provided. The invention further relates to a piston compressor with a compressor housing, a cylinder arranged therein in which a piston for compressing a

Compression medium moved back and forth and a cylinder head arranged on the compressor housing on the cylinder.

Piston compressors are used in many different applications, e.g. for compressing gases, but also as piston pumps for conveying

Liquids. In vehicles, especially in vehicles of great length, e.g. Trains or trucks are usually used with compressed air brake systems. E.g. Ambient air on the towing vehicle is compressed into compressed air by means of a piston compressor, which supplies the braking system. The brakes are then applied to the wheels or axles using conventional disc or drum brakes. The energy for braking is usually provided by springs or the like. made available and the compressed air is used to hold the brake against the spring force in the open state. This means that, for safety reasons, the brake closes automatically if the pressure is too low, for example due to a leak. Compared to hydraulic brake systems, as they are usually e.g. is used in cars, on the one hand the advantage that no hydraulic fluid is required, which is particularly advantageous in long vehicles. Another advantage is that the brakes are on and off

uncoupled wagons or trailers also relatively easy with the e.g. at the

Towing vehicle generated by the piston compressor compressed air can be supplied. The use of compressed air can also be used when coupling and uncoupling wagons or

No hydraulic fluid leaks out from trailers. Due to the essentially constant generation of compressed air, any short-term leakage does not play a role, e.g. can take place when uncoupling a wagon or trailer.

In the case of trucks in particular, the installation space in the towing vehicle is usually very limited, which makes the arrangement of the piston compressor more difficult. Due to increasingly strict legal regulations, the engine compartment in which the compressor is often arranged is usually also encapsulated in order to generate the lowest possible noise emissions. Last but not least, they are also responsible for compliance with the increasingly strict emissions legislation

Exhaust gas cleaning devices such as SCR catalysts, particle filters, etc. required, which further limit the available installation space. Manufacturers therefore strive to be as flexible as possible with regard to the arrangement of the piston compressor. With conventional compressors, however, such flexibility can only be insufficiently achieved, since a change in the spatial arrangement of the compressor is usually accompanied by a structural change of the entire compressor or at least parts of it, e.g. a change in connections, which is disadvantageous because this leads to a high expenditure of time and money.

It is therefore an object of the invention to provide a piston compressor and a cylinder head for a piston compressor which has the most flexible possible arrangement of the

Piston compressor allows without having to make structural changes to the piston compressor, in particular to the cylinder head.

According to the invention, the object is achieved in that the suction connection and / or the pressure connection are designed to be adjustable in at least two positions on the cylinder head, the suction chamber preferably being arranged at least in sections radially outside the pressure chamber or vice versa. This increases the flexibility with regard to the

Increased arrangement of the compressor and the accessibility of the suction connection and / or the pressure connection improved.

The suction chamber advantageously surrounds the pressure chamber at least in sections in an annular manner or the pressure chamber surrounds the suction chamber in at least sections in an annular manner, the suction connection preferably being provided radially outside on the circumference of the cylinder head or on a first axial cylinder head end of the cylinder head and / or the pressure connection being provided radially outside on the circumference of the cylinder head or is provided at a first axial cylinder head end of the cylinder head. As a result, the flexibility of the arrangement of the suction connection and the pressure connection can be further increased, in particular a simple adjustability of the suction connection and / or the pressure connection in the circumferential direction on the cylinder head can be realized.

At least one valve seat plate is advantageously provided on the cylinder head, which valve seat plate delimits the suction chamber and / or the pressure chamber at a second axial cylinder head end.

According to an advantageous embodiment, at least the suction connection is provided on a suction insert which is adjustably arranged in the cylinder head and which the

The suction chamber is at least partially bounded, with a plurality of openings or one located in the cylinder head for adjusting the position of the suction connection

Circumferential opening are provided, wherein the suction port protrudes through one of the openings at least partially to the outside. Preferably, the suction insert is at least partially annular, with the suction connection radially on the The circumference of the suction insert is arranged and the openings or the opening extending in the circumferential direction are provided radially on the circumference of the cylinder head, the suction port protruding through one of the openings at least partially radially outward. The suction connection can, however, also be arranged on an end face of the suction insert and the openings can be provided at the first axial end of the cylinder head, the suction connection projecting through one of the openings at least partially axially outward. Depending on the desired alignment of the suction connection, the position of the suction insert relative to the cylinder head can thus be changed, whereby a very simple adjustability of the suction connection is achieved.

Particularly preferably, the pressure chamber is designed in the form of a ring and is arranged centrally on the inside of the cylinder head and the suction insert is designed in an annular manner, the suction insert being arranged radially outside the pressure chamber and surrounding the pressure chamber. This creates an adjustability of the suction connection in the circumferential direction of the cylinder head, the pressure connection being provided essentially invariably in the axial direction.

According to a further advantageous embodiment of the invention, the pressure connection is provided on a pressure insert which partially delimits the pressure chamber, with a plurality of on the cylinder head for adjusting the position of the pressure connection

Openings are provided, the pressure connection of the pressure insert part protruding at least partially through one of the openings of the cylinder head. Preferably, the pressure insert is at least partially annular, the pressure connection being arranged on an end face of the pressure insert and the openings being provided on the first axial cylinder head end of the cylinder head, the

Pressure connection one of the openings at least partially protrudes axially outward or the pressure connection is arranged radially on the circumference of the pressure insert and the openings are provided radially on the circumference of the cylinder head, the pressure connection protruding through one of the openings at least partially radially outward. As a result, a simple adjustment option can be created for the pressure connection analogous to the suction connection. The radial and / or axial alignment of the pressure connection and the openings can increase the flexibility of the adjustability.

It is also advantageous if at least one pressure element is provided on the suction insert and / or the pressure insert, which axially braces the suction insert and / or the pressure insert against the valve seat plate, the pressure element preferably being an elastic O-ring is formed, which is arranged in a preferably annular groove on the suction insert and / or pressure insert. This ensures that there is no axial play between the suction insert and / or pressure insert and the cylinder head, whereby the seal between the suction insert and / or pressure insert and Valve seat plate is improved. Due to the simple design as an elastic O-ring, simple assembly can be ensured and the suction insert and / or pressure insert is pressed as evenly as possible over the entire

Extension of the suction insert and / or pressure insert reached.

The suction insert is advantageously made from a heat-insulating material, preferably from plastic. This causes the heating of the sucked in

Reduced compression medium, whereby the delivery rate of the compressor can be increased.

If the cylinder head by means of a, arranged on the circumference of the cylinder head

Clamping ring is attached to the compressor housing of the reciprocating compressor, a simple mounting option can be created that allows a rapid change in the position of the suction port and / or the pressure port, the clamping ring preferably having at least one interruption on the circumference and which is in the

Interruption of mutually facing ends of the clamping ring have radially outwardly directed tabs on which the clamping ring can be clamped by means of a fastening device in order to fasten the cylinder head to the compressor housing.

The present invention is explained in more detail below with reference to FIGS. 1 to 3, which are advantageous by way of example, schematically and not in a limiting manner

Show embodiments of the invention. It shows

1 shows a section through a cylinder head, mounted on a compressor housing of a piston compressor,

2 shows a cylinder head according to the invention mounted on a compressor housing of a reciprocating compressor

3 shows an alternative embodiment of a cylinder head with adjustable suction and pressure connections.

1 shows an advantageous embodiment of a cylinder head 1 in the assembled state on the compressor housing 2 of a piston compressor 3. The basic structure and mode of operation of a piston compressor are known, which is why they are not discussed in detail here. The cylinder head 1 is arranged in a known manner at the axial end of the cylinder 4 on the compressor housing 2 and seals the cylinder 4 outward in the axial direction. In the cylinder 4, a piston 5 is movably arranged, which compresses a compression medium and which is driven by a crankshaft (not shown) via a push rod 25 shown schematically. The crankshaft is rotatably mounted in the compressor housing and a drive torque is applied to the Crankshaft introduced, which is made available, for example, by the internal combustion engine of a truck, an electric motor of a locomotive or in another suitable manner. A rotary movement of the crankshaft is converted into an essentially translatory oscillating movement of the piston 5 via the crankshaft and the push rod 25. In the example shown, it is an air compressor, so the compression medium is ambient air. The ambient air can of course be pretreated by means of suitable devices (not shown), for example filtered or dehumidified.

Of course, other compression media can also be used.

The cylinder head 1 has a pressure chamber 6, which is designed here as a central, essentially annular pressure chamber 6, as well as a suction chamber 7 spatially separated from the pressure chamber 6. The suction chamber 7 is also annular here and is located radially outside the pressure chamber 6 thus essentially the pressure chamber 6. A valve seat plate 8 is arranged on a second axial cylinder head end ZE2 of the cylinder head 1, between the cylinder head 1 and the compressor housing 2. In the valve seat plate 8, suction openings 9 corresponding to the suction chamber 7 and pressure openings 10 corresponding to the pressure chamber 6 are provided, which penetrate the valve seat plate 8 in the axial direction so that the cylinder with the suction chamber 7 and the

Pressure chamber 6 is in communication. The valve seat plate 8 thus forms the valve seat of the suction valve SV and pressure valve DV. The suction openings 9 and pressure openings 10 are each closed or opened by valve elements 11, 12, which are usually pressure-controlled. The valve seat plate 8 can, for example, as indicated in FIG. 1, be fastened to the cylinder head 1 with a central screw 24 and delimits the suction chamber 7 and the pressure chamber 6 in the axial direction at the second axial cylinder head end ZE2. On the end face of the valve seat plate 8 facing the cylinder 4 are on the

Suction openings 9 are each arranged suction valve elements 11 and on the end face of the valve seat plate 8 facing away from the cylinder 4, pressure valve elements 12 are arranged at the pressure openings 10. The suction valve SV and pressure valve DV are designed here in the form of lamellar valves, but of course other designs would also be conceivable, e.g. spring operated check valves or ring valves. It would also be conceivable that regulated or controlled valves are provided, in which case a corresponding valve control would be required, e.g. similar to one

Reciprocating engine. The specific type of design of the suction valve SV and pressure valve DV is, however, irrelevant for the present invention.

When the piston 5 moves away from the valve seat plate 8 (here downwards), a negative pressure is generated in the cylinder 4, whereby the suction valve elements 11 of the

Valve seat plate 8 are lifted off and the pressure valve elements 12 are pressed against the valve seat plate 8. This closes the pressure openings 10 and the Breathing openings 9 released. As a result, the compression medium, here air, is sucked into the suction chamber 7 from the environment via a suction connection 14 communicating with the suction chamber 7 (see FIG. 2) and flows from the suction chamber 7 via the

Suction openings 9 in the cylinder 4. When the piston 5 is back in the direction of the

When valve seat plate 8 is moved (upwards here), the pressure conditions in cylinder 4 change and an overpressure is generated in cylinder 4, whereby suction valve elements 11 are pressed against valve seat plate 8 and suction openings 9 are closed. The

Compression medium is now compressed in the cylinder 4 until the

Pressure valve elements 12 lift off the valve seat plate 8 and the compressed

Compression medium flows through the pressure openings 10 into the pressure chamber 6 and further to a pressure connection 13 connected therewith, which is shown in FIG

Embodiment is provided on the cylinder 4 facing away from the first axial cylinder head end ZE1 of the cylinder head 1.

The pressure in the cylinder 4 at which the pressure valve DV opens depends essentially on the structural design of the pressure valve DV, which depends on the desired pressure level to be achieved. In the case of the lamellar valves shown, the achievable pressure level depends, for example, on the rigidity of the lamellas; the stiffer the lamella, the later the pressure valve DV opens and the higher the pressure of the compressed compression medium. If controlled or regulated valves are used, it would be conceivable, for example, that the pressure valve (s) DV in a

open certain stroke of the piston 5 or as a function of a certain pressure in the cylinder 4. However, such pressure regulation requires correspondingly controllable valves, which of course is associated with increased effort. A pressure control can e.g. be useful if the ambient pressure outside of the piston compressor 3 is subject to strong fluctuations, which can be the case, for example, when a vehicle is operated at different altitudes.

In the example shown, the pressure connection 13 is in the axial direction on one

Cylinder head cover 1a arranged, which by means of fasteners, such as

for example screws 20, at a first axial cylinder head end ZE1 of the

Cylinder head 1 is attached. From the pressure connection 13 the compressed

Compression medium KM can be fed to a pressure accumulator, not shown, for example, or can also be used directly, for example to be fed to a compressed air brake system. The alignment of the pressure connection 13 is essentially based on the requirements of the piston compressor, so that the pressure connection 13 could also be provided radially outside on the circumference of the cylinder head 1. The pressure chamber 6 would of course have to be designed accordingly in the cylinder head 1. For example, the pressure chamber 6 does not necessarily have to be annular and central, as shown in FIG Embodiment in Fig.1. For example, the pressure chamber 6 could also be arranged in a ring shape radially outside of the suction chamber 7, that is to say an essentially reversed arrangement of the suction chamber 7 and pressure chamber 6 as shown. Consequently, the pressure connection 13 could also be provided on the radial circumferential surface of the cylinder head 1 or again on the first axial cylinder head end ZE1 such that the pressure connection 13 communicates with the pressure chamber 6. Likewise, both the suction chamber 7 and the pressure chamber 6 could be designed to be ring-shaped at least in sections and arranged radially on the outside of the cylinder head.

For example, the suction chamber 7 and the pressure chamber 6 could adjoin one another in the circumferential direction and each extend over part of the circumference of the cylinder head 1, as is shown schematically in FIG. 3 by the dashed lines. The suction port 14 (or the suction ports 14) and the pressure port 13 (or the pressure ports 13) could then each be in the radial direction on the circumference of the

Be arranged cylinder head 1 or in the axial direction on the first axial

Cylinder head end ZE1. Of course, only either the suction connection 14 or only the pressure connection 13 could be arranged radially and the other one axially or both axially. It can therefore be seen that there are many possibilities of concrete constructive

There is a design that is essentially based on given boundary conditions such as a planned installation position of the piston compressor 3 aligns. It is essential for the invention that there is a pressure chamber 6 with a pressure connection 13 and a suction chamber 7 with a suction connection 14 that is spatially separated from the pressure chamber 6.

In order to be as flexible as possible in the arrangement of the piston compressor 3, it is provided according to the invention that the suction connection 14 and / or the pressure connection 13 are designed to be adjustable in at least two positions on the cylinder head 1. The piston compressor 3 can thus be adapted very easily to different installation situations without having to make complex structural changes to the cylinder head 1. In a simple embodiment, the pressure connection 13, as shown in FIG. 1, is arranged in the axial direction on the first axial cylinder head end ZE1 and communicates with the central ring-shaped pressure chamber 6. The pressure connection 13 would therefore essentially be immutable. Of course, the pressure connection 13 does not have to be arranged exactly in the center of the cylinder head cover 1 a, but could of course also be arranged slightly eccentrically, it is essential that it is connected to the pressure chamber 6.

The suction connection 14 could then be designed, for example, in such a way that at least two suction connections 14 would be provided, for example, diametrically opposite in the radial direction on the outer circumference of the cylinder head 1. The adjustability would be realized by the fact that, although both suction connections 14 communicate with the suction chamber 7 in the radial direction, only one suction connection 14 for feeding in Compression medium KM is used, with the other suction port 14 being closed. The closing could for example by means of a suitable

Stopper 26 take place, for example, a thread would be provided on the suction port 14 in a suitable manner. Such a sealing plug 26 is shown in FIG. 3 by way of example in an exploded view for an axial suction connection 14 and an axial pressure connection 13. Of course, a (not shown)

Sealing element can be provided on the suction port 14, on the pressure port 13 and / or on the respective sealing plug 16, which is advantageous because of the relatively high pressure, particularly on the pressure port 13, in order to allow little or no leakage of compressed compression medium. In order to be even more flexible in the arrangement of the piston compressor 3, more than two suction connections 14 could of course also be provided on the circumference, for example four suction connections 14, which are each spaced apart at an angle of 90 °, or also several pressure connections 13, as in FIG Fig.3 is indicated.

The reverse variant would also be conceivable, with a radially outer annular pressure chamber 6 and a centrally inner suction chamber 7.

Correspondingly, several pressure connections 13 could be arranged on the circumference of the cylinder head 1, with only one of the pressure connections 13 being preferably used in each case. The adjustability is of course not on either

Suction port 14 or pressure port 13 limited, just as both ports could be adjustable, as shown in Figure 3, the systematic remains the same. The direction in which the suction connections 14 and pressure connections 13 extend is not restricted to the axial and radial directions either. Given a suitable structural design of the cylinder head 1, one or more suction connections 14 (or pressure connections 13) could also extend, for example, at 45 ° to the axial and radial direction.

According to a particularly advantageous embodiment of the invention according to FIGS. 1 and 2, at least the suction connection 14 is provided on a suction insert 15 which at least partially delimits the suction chamber 7. The suction insert 15 is in one

Recess 27 arranged on the cylinder head 1 and at least partially forms the

Suction chamber 7 off. The suction insert 15 is designed, for example, as a ring with an essentially U-shaped cross section, the open end face of the suction insert 15 resting axially on the valve seat plate 8. The suction chamber 7 is thus formed within the U-shaped cross section. The suction insert 15 is thus adjustable over the circumference relative to the housing of the cylinder head 1. The position of the suction connection 14 on the circumference of the cylinder head 1 can thus also be adjusted by adjusting the suction insert 15 over the circumference. On the housing of the cylinder head 1, a plurality of can be used to adjust the position of the suction port 14 Openings 16 may be provided. The suction insert 15 can then be arranged in the cylinder head 1 in such a way that the suction connection 14 protrudes through one of the openings 16 at least partially to the outside. In the embodiment shown in Figure 2, two openings 16 are provided on the outer peripheral surface of the cylinder head 1, which in one

specified angular distance are spaced from each other to the position of the

To adjust the suction connection 14. The suction insert 15 is designed here essentially in the shape of a ring, the suction connection 14 being arranged radially on the circumference of the suction insert 15. The suction insert 15 can be arranged in the cylinder head 1 in such a way that, depending on the desired orientation, the suction connection 14 protrudes through one of the (here two) openings 16 at least partially radially outward.

It is also conceivable that an opening 16 extends in the circumferential direction in the form of an elongated hole on the circumference of the housing of the cylinder head 1. The position of the suction connection 14 in the area of the opening 16 could thus be adjusted practically continuously, which enables the suction connection 14 to be adjusted particularly flexibly.

Analogously to this, it would of course also be conceivable that the openings 16 are provided on the first axial cylinder head end ZE1 instead of on the radial circumferential surface of the cylinder head 1 and that the suction connection 14 is arranged on an axial end face of the suction insert 15 facing the first axial cylinder head end ZE1 is. The suction insert 15 can then be arranged in the cylinder head 1 so that the suction connection 14, depending on the desired orientation, one of the openings 16 at the axial end,

for example on the cylinder head cover 1a, protrudes in the axial direction.

In the advantageous exemplary embodiment in FIG. 2, the suction insert 15 is essentially ring-shaped and is arranged radially outside of the pressure chamber 6 located centrally on the inside. The suction insert 15 thus essentially completely surrounds the pressure chamber 6. The pressure chamber 6 is integrated here directly in the cylinder head 1, which is particularly advantageous in the case of relatively high compression pressures, since good sealing of the

Pressure chamber 6 is guaranteed and apart from the valve seat plate 8, no additional sealing measures are required. Sealing elements can of course be provided for the suction insert 15, as indicated in FIG.

As with the suction connection 14, an analogue adjustability for the pressure connection 13 could of course also be implemented. For this purpose, the pressure connection 13 could be provided on a pressure insert (not shown) which at least partially delimits the pressure chamber 6. The pressure insert would then be adjustably arranged again in the cylinder head. The cylinder head 1 would therefore be used to adjust the position of the

Pressure connection 13, a plurality of openings 16 are provided, the pressure insert being arranged on the cylinder head 1 in such a way that the pressure connection 13 one of the openings 16 protrudes at least partially to the outside. For example, the pressure insert could be at least partially annular and the

Pressure connection 13 can be arranged on an end face of the pressure insert part axially facing the first cylinder head end ZE1. The openings 16 would be provided at the first axial end of the cylinder head 1 (here on the cylinder head cover 1a), the pressure connection 13 projecting through one of the openings 16 at least partially axially outward. In the same way, the pressure connection 13 could also be arranged radially on the circumference of the pressure insert and the openings could be provided radially on the circumference of the cylinder head 1. The pressure insert would then be arranged in the cylinder head 1 in such a way that the pressure connection 13 protrudes radially outward at least partially through one of the openings 16, analogously to the example of the suction connection 14 shown in FIG.

A suction line (not shown) can, for example, be connected to the suction connection 14

connected, e.g. Sucks in air through a filter from outside a vehicle. A pressure line (not shown) can be arranged at the pressure connection 13, by means of which the compressed compression medium e.g. is fed to a pressure accumulator. The suction insert 15 and / or the pressure insert can e.g. made of a suitable plastic or a metallic material, for example aluminum, steel, etc. Of course, a combination of several materials, e.g. several plastics with different material

Properties conceivable in order to adapt the suction insert 15 and / or the pressure insert to certain conditions of use. In particular, it is advantageous if the suction insert 15 is made of a suitable heat-insulating plastic. This has the advantage that the suctioned compression medium is not heated as much,

for example through the adjoining pressure chamber 6 or the cylinder 4, in which the temperatures are usually higher than in the suction chamber 7. The lower heating leads to an increase in the delivery rate of the piston compressor, ie in the

Essentially to a higher efficiency of the compressor. For example, the sections of the suction insert 15 resting on the valve seat plate 8 could be used for

Improvement of the seal can be made of a suitable, relatively soft plastic and the remaining sections of the suction insert 15 could be made of another plastic with suitable strength properties. Many known methods can be used to manufacture the suction insert 15 and the pressure insert, e.g. casting methods such as sand casting, die casting, etc. or also generative methods such as 3D printing, laser sintering, etc. For the cylinder head 1 and the compressor housing 2 preferably metallic materials such as aluminum or steel are used, but suitable plastics would also be conceivable. The shape of the openings 16 can essentially be selected as desired. In any case, it should be chosen so that sufficient space is provided for the suction connection 14 and / or the pressure connection 13 to pass through. In the example shown, the openings 16 are essentially rectangular with rounded corners and a certain amount of play is provided between the suction connection 14 and the cylinder head 1 in the axial direction and in the circumferential direction in order to facilitate assembly.

2 shows the cylinder head 1 in the assembled state on the compressor housing 2, the cylinder head 1 in the example shown by means of a clamping ring 17 on the

Compressor housing 2 is attached. The clamping ring 17 has at least one interruption 17a on the circumference, the ends of the clamping ring 17 facing each other in the interruption 17a having tabs 18 directed radially outward, on which the clamping ring 17 can be clamped by means of a fastening device 19, around the cylinder head 1 on the compressor housing 2 to attach. The fastening device 19 is designed here in the form of a screw connection. The clamping ring 17 enables quick and easy assembly and, in particular, quick and easy adjustability of the

Suction connection 14 and / or pressure connection 13. For this purpose, the clamping ring 17 would have to be loosened, for example, so that the suction insert 15 can be adjusted over the circumference. Then the clamping ring 17 can be clamped again. In addition

the clamping ring 17 also ensures a sufficiently good seal between

Cylinder head 1 and compressor housing 2. Of course, cylinder head 1 could also be attached to compressor housing 2 in a different way, for example, flanges facing cylinder head 1 and compressor housing 2 could be provided in which corresponding bores are distributed around the circumference. Screw connections could be arranged in the bores with which the flanges are screwed in the axial direction. Of course, a sealing element or a sealing compound can also be provided between the cylinder head 1 and the compressor housing 2 for better sealing.

As can be seen in FIG. 1, the suction insert 15 is closed by the valve seat plate 8 on the side facing the cylinder. In order to achieve a sufficiently good seal between the valve seat plate 8 and the suction insert 15, it is advantageous if at least one pressure element 21 is provided on the end face of the suction insert 15 facing the first axial cylinder head end ZE1. When assembling the cylinder head 1, the suction insert 15 is brought into the desired position so that the suction connection 14 is in the desired position, for example through one of the openings 16 provided, and is clamped to the compressor housing 2 by means of the clamping ring 17. With a corresponding structural design of the cylinder head 1, the tensioning of the clamping ring 17 creates an axial force which is exerted on the cylinder head 1 by a surface 22 of the recess 27 of the cylinder head 1 axially opposite the suction insert 15 Pressure element 21 is exerted (see Figure 1). In the example shown, the pressure element 21 is designed as an elastic O-ring and arranged in an annular groove 23 on the suction insert 15. Due to the axial force exerted on the O-ring by the surface 22, the O-ring is elastically deformed and presses the suction insert 15 against the valve seat plate 8 essentially analogously to a spring. This ensures that there is no axial play occurs between cylinder head 1 and suction insert 15 and between suction insert 15 and valve seat plate 8, whereby the seal between suction insert 15 and valve seat plate 8 is improved. Of course there would be others too

Configurations of the pressure element 21 are conceivable, for example individual

Rubber elements, coil springs or a plate spring can be provided as the pressure element 21. If a pressure insert is provided for the pressure connection 13, it is of course advantageous that at least one pressure element 21 is also provided on the pressure insert. If the pressure insert or the suction insert 15 are constructed differently than ring-shaped, it is of course advantageous if the shape of the

Pressure element 21 is adapted to the shape of the respective insert.

Claims

1. Cylinder head (1) for a piston compressor (3), with a suction chamber (7) and a spatially separated pressure chamber (6), wherein the cylinder head (1) with a

Suction chamber (7) communicating suction connection (14) for supplying a

Compression medium (KM) and a communicating with the pressure chamber (6)

Pressure connection (13) are provided for discharging the compressed compression medium (KM), characterized in that the suction connection (14) and / or the pressure connection (13) are adjustable in at least two positions on the cylinder head (1).

2. Cylinder head (1) according to claim 1, characterized in that the suction chamber (7) is arranged at least partially radially outside the pressure chamber (6) or vice versa.

3. Cylinder head (1) according to claim 2, characterized in that the suction chamber (7) surrounds the pressure chamber (6) at least partially in an annular manner or that the pressure chamber (6) surrounds the suction chamber (7) at least partially in an annular manner.

4. Cylinder head (1) according to one of claims 1 to 3, characterized in that the suction connection (14) is provided radially outside on the circumference of the cylinder head (1) or on a first axial cylinder head end (ZE1) of the cylinder head (1) and / or that the pressure connection (13) is provided radially on the outside on the circumference or on a first axial cylinder head end (ZE1) of the cylinder head (1).

5. cylinder head (1) according to any one of claims 1 to 4, characterized in that at least one valve seat plate (8) is provided on the cylinder head (1) which the

The suction chamber (7) and / or the pressure chamber (6) are limited at a second axial cylinder head end (ZE2).

6. Cylinder head (1) according to one of claims 1 to 5, characterized in that at least the suction connection (14) is provided on a suction insert (15) which is adjustably arranged in the cylinder head (1) and which the suction chamber (7 ) at least partially limited, with a plurality of openings (16) or an opening (16) extending in the circumferential direction being provided on the cylinder head (1) to adjust the position of the suction connection (14), the suction connection (14) being one of the openings ( 16) at least partially protrudes to the outside.

7. cylinder head (1) according to claim 6, characterized in that the suction insert (15) is at least partially annular, wherein the

The suction connection (14) is arranged radially on the circumference of the suction insert (15) and that the openings (16) or the opening (16) extending in the circumferential direction are provided radially on the circumference of the cylinder head (1), the suction connection (14) protruding through one of the openings (16) at least partially radially outward.

8. cylinder head (1) according to claim 6, characterized in that the suction insert (15) is at least partially annular, wherein the

Suction connection (14) is arranged on an end face of the suction insert and that the openings (16) or the opening (16) extending in the circumferential direction are provided on the first axial cylinder head end (ZE1) of the cylinder head (1), the suction connection (14 ) one of the openings (16) protrudes axially outward at least partially.

9. Cylinder head (1) according to one of claims 6 to 8, characterized in that the pressure chamber (6) is annular and is arranged centrally on the inside of the cylinder head (1) and that the suction insert (15) is annular, radially is arranged outside the pressure chamber (6) and surrounds the pressure chamber (6).

10. Cylinder head (1) according to one of claims 6 to 9, characterized in that the pressure connection (13) is provided on a pressure insert which partially delimits the pressure chamber (6), the cylinder head (1) for adjusting the position of

Pressure connection (13) a plurality of openings (16) are provided, the pressure connection (13) of the pressure insert part protruding through one of the openings (16) of the cylinder head (1) at least partially to the outside.

11. Cylinder head (1) according to claim 10, characterized in that the pressure insert is at least partially annular, the pressure connection (13) being arranged on an end face of the pressure insert and that the openings (16) on the first axial cylinder head end (ZE1) of the cylinder head (1) are provided, the pressure connection (13) protruding through one of the openings (16) at least partially axially outward.

12. Cylinder head (1) according to claim 10, characterized in that the pressure insert is at least partially annular, the pressure connection (13) is arranged radially on the circumference of the pressure insert and that the openings (16) radially on the circumference of the Cylinder head (1) are provided, the pressure connection (13) protruding through one of the openings (16) at least partially radially outward.

13. Cylinder head (1) according to one of claims 6 to 12, characterized in that at least one pressure element (21) is provided on the suction insert part (15) and / or on the pressure insert part, which the suction insert part (15) and / or the pressure insert axially braced against the valve seat plate (8).

14. Cylinder head (1) according to claim 13, characterized in that the pressure element (21) is designed as an elastic O-ring which is attached to the suction insert part (15) and / or pressure insert part, preferably in an annular groove (23) , is arranged.

15. Cylinder head (1) according to claim one of claims 6 to 14, characterized

characterized in that the suction insert (15) and / or the pressure insert are made of a heat-insulating material, preferably plastic.

16. Piston compressor (3) with a compressor housing (2), a cylinder (4) arranged therein in which a piston (5) for compressing a compression medium (KM) moves back and forth and with one on the compressor housing (2) on the cylinder (4) arranged cylinder head (1) according to one of claims 1 to 15.

17. Piston compressor according to claim 16, characterized in that the

The cylinder head (1) is attached to the compressor housing (2) of a piston compressor (3) by means of a clamping ring (17) arranged on the circumference of the cylinder head (1).

18. Piston compressor according to claim 17, characterized in that the clamping ring (17) on the circumference has at least one interruption (17a) and that in the

Interruption (17a) facing ends of the clamping ring (17) have radially outwardly directed tabs (18) on which the clamping ring (17) by means of a

Fastening device (19) can be clamped in order to fasten the cylinder head (1) to the compressor housing (2).