GB1602149A - Gas compressor cylinder head - Google Patents

Description

(54) GAS COMPRESSOR CYLINDER HEAD (71) We, WABCO FAHRZEUG BREMSEN GMBH (Formerly Wabco Westinghouse GMBH), a German Company of, Am Lindener Hafen 21, 3000 Hannover 91, Germany, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The invention relates to a gas compressor cylinder head.

It is known to use, in compressor cylinder heads, separate valve carrier plates for receiving suction and pressure valves and to secure a valve carrier plate with respect to a cylinder head using seals. Only a comparatively poor heat transfer from a relatively hot valve carrier plate to a cylinder head is possible with such an arrangement and in order to achieve an adequate cooling, to reduce the extent of oil carbon formation to a tolerable extent, it is well known to provide cavities in the valve carrier plate. However, even this step yields only a slight improvement and has the disadvantage of higher manufacturing costs and of resulting in a larger overall height.

The present invention provides a gas compressor cylinder head in combination with a valve carrier plate for a suction and a pressure valve, the valve carrier plate being integral with the cylinder head and supporting or comprising a valve seat for the suction valve and/or the pressure valve.

Embodiments of the invention will be described in greater detail below, by way of example, with reference to the accompanying drawings in which: Fig. I is a section through a compressor cylinder head, constructed in accordance with the invention, using a blade suction valve and a disk pressure valve, Fig. 2 is a section through the cylinder head shown in Fig. 1 along the line A-A Fig. 3 is a section through another cylinder head, constructed in accordance with the invention, using a blade suction valve and a blade pressure valve, and Fig. 4 is a section through the cylinder head shown in Fig. 3 along the line B-B.

Fig. 1 shows a cylinder head 2 having a suction connection 4, a pressure connection 6, a suction chamber 8 a pressure chamber 10, a cooling chamber 12, a blade suction valve 14, and a disk pressure valve 16 comprising inter alia a valve seat 18, a valve trap 20 and a screw joint 22. The pressure valve 16 is located in a bore 24 of a valve carrier plate 26 which is constructed in one piece with the cyinder head 2. In the configuration shown in the drawing, the bore 24 is stepped but it may alternatively be unstepped and, as a further alternative, the valve trap can lie directly opposite the valve seat 16 on a downwardly projecting projection of the cylinder head.

Fig. 2 shows a section through the cylinder head shown in Fig. I along the line A-A. The same parts in Figs. 1 and 2 have been given the same reference numbers and since, with the exception of cooling medium ports 28 and 30, the section shown in Fig. 2 does not show any additional parts, reference may be made to the description of Fig. 1.

Fig. 3 shows another form of cylinder head 40 constructed according to the invention. For cylinder head 40 has a cylinder head cover 42, and includes a suction connection 44, a pressure connection 46, a suction chamber 48, a pressure chamber 50, a cooling chamber 52, a blade suction valve 54 and a pressure valve 56 which is constructed as a blade pressure valve. The cooling chamber 52 and the pressure chamber 50 are separated by a wall 60 which has a projection 62 having a threaded blind bore 64 for receiving a screw joint 66 for fastening the pressure valve 56.

The pressure valve 56 is located in a stepped bore 68 of a valve carrier plate 70 which is constructed in one piece with the cylinder head 2. As an alternative, the valve seat of the blade pressure valve 56 may be formed by the valve carrier plate 70 itself.

As a result of integrating the valve carrier plate with the cylinder head, it is possible to make the suction chamber and pressure chamber smaller and to make the cooling chamber larger, and to take the latter over relatively large portions round the pressure chamber, as clearly shown in Fig. 3: as a result of this the cooling, in particular of the integrated valve carrier plate, can be further improved and it is moreover possible to separate the suction and the pressure chamber in an improved manner.

The bore 68 in the cylinder head shown in Figure 3 may also be unstepped.

Figure 4 shows a section through the cylinder head shown in Fig. 3 along the line B-B. In Figures 3 and 4 the same parts have been given the same reference numbers and, since the section shown in Figure 4 has no additional components, reference may be made to the description of Figure 3.

Either liquid, for example water or oil, or gas, for example air, may be used as the cooling medium in the cylinder heads described above.

The constructions described above enable adequate cooling to be ensured and volumetric efficiency to be improved while, at the same time, a smaller overall height and lower manufacturing costs can be achieved.

Optimum dissipation of heat is possible, under given circumstances, so that oil carbon can be prevented from forming, and the seal which has previously been present between the valve carrier plate and the cylinder head is no longer necessary and additional cavities for cooling liquid in the carrier plate can be dispensed with.

By integrating the valve carrier plate with the cylinder head it is possible to construct the suction and pressure chambers so that they are small in comparison with the cooling chamber, whereby larger cooling surfaces for the valve carrier plate can be obtained. Moreover, the dead spaces can be reduced. By this means and as a result of the improved cooling, an improvement in the volumetric efficiency can be achieved and a better dissipation of heat from the valve seat is rendered possible. Because the cylinder head is integral with the valve carrier plate, the manufacturing costs can be reduced.

By providing the cylinder head with a detachable cover as in Fig. 3 it is possible to use the die casting process to manufacture the compressor cylinder head with the result that costs can be further decreased. In addition, this feature facilitates the provision of further or additional cooling ribs. By providing the cylinder head with a through-flow cavity for cooling agent, an improved cooling, in particular of the integrated valve carrier plate also, can be achieved.

WHAT WE CLAIM IS: 1. A gas compressor cylinder head in combination with a valve carrier plate for a suction and a pressure valves, the valve carrier plate being integral with the cylinder head and supporting or comprising a valve seat for the suction valve and/or the pressure valve.

2. A compressor cylinder head according to claim 1, in which the suction valve is constructed as a blade valve.

3. A compressor cylinder head according to claim 1 or claim 2, in which the pressure valve is constructed as a disk valve.

4. A compressor cylinder head according to claim 1 or claim 2, in which the pressure valve is constructed as a blade valve.

5. A compressor cylinder head according to any one of the preceding claims, in which the cylinder head is provided with a detachable cover.

6. A compressor cylinder head according to any one of the preceding claims in which the cylinder head is provided with a through-flow cavity for cooling agent.

7. A gas compressor cylinder head substantially as described herein with reference to, and as shown in, Figs. I and 2 or Figs. 3 and 4 of the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. make the suction chamber and pressure chamber smaller and to make the cooling chamber larger, and to take the latter over relatively large portions round the pressure chamber, as clearly shown in Fig. 3: as a result of this the cooling, in particular of the integrated valve carrier plate, can be further improved and it is moreover possible to separate the suction and the pressure chamber in an improved manner. The bore 68 in the cylinder head shown in Figure 3 may also be unstepped. Figure 4 shows a section through the cylinder head shown in Fig. 3 along the line B-B. In Figures 3 and 4 the same parts have been given the same reference numbers and, since the section shown in Figure 4 has no additional components, reference may be made to the description of Figure 3. Either liquid, for example water or oil, or gas, for example air, may be used as the cooling medium in the cylinder heads described above. The constructions described above enable adequate cooling to be ensured and volumetric efficiency to be improved while, at the same time, a smaller overall height and lower manufacturing costs can be achieved. Optimum dissipation of heat is possible, under given circumstances, so that oil carbon can be prevented from forming, and the seal which has previously been present between the valve carrier plate and the cylinder head is no longer necessary and additional cavities for cooling liquid in the carrier plate can be dispensed with. By integrating the valve carrier plate with the cylinder head it is possible to construct the suction and pressure chambers so that they are small in comparison with the cooling chamber, whereby larger cooling surfaces for the valve carrier plate can be obtained. Moreover, the dead spaces can be reduced. By this means and as a result of the improved cooling, an improvement in the volumetric efficiency can be achieved and a better dissipation of heat from the valve seat is rendered possible. Because the cylinder head is integral with the valve carrier plate, the manufacturing costs can be reduced. By providing the cylinder head with a detachable cover as in Fig. 3 it is possible to use the die casting process to manufacture the compressor cylinder head with the result that costs can be further decreased. In addition, this feature facilitates the provision of further or additional cooling ribs. By providing the cylinder head with a through-flow cavity for cooling agent, an improved cooling, in particular of the integrated valve carrier plate also, can be achieved. WHAT WE CLAIM IS:

1. A gas compressor cylinder head in combination with a valve carrier plate for a suction and a pressure valves, the valve carrier plate being integral with the cylinder head and supporting or comprising a valve seat for the suction valve and/or the pressure valve.

2. A compressor cylinder head according to claim 1, in which the suction valve is constructed as a blade valve.

3. A compressor cylinder head according to claim 1 or claim 2, in which the pressure valve is constructed as a disk valve.

4. A compressor cylinder head according to claim 1 or claim 2, in which the pressure valve is constructed as a blade valve.

5. A compressor cylinder head according to any one of the preceding claims, in which the cylinder head is provided with a detachable cover.

6. A compressor cylinder head according to any one of the preceding claims in which the cylinder head is provided with a through-flow cavity for cooling agent.

7. A gas compressor cylinder head substantially as described herein with reference to, and as shown in, Figs. I and 2 or Figs. 3 and 4 of the accompanying drawings.