EP1703125A2 - Cylinder head for multi stage compressor - Google Patents

Abstract

The cylinder head has piston and cylinders arranged in series whereby the pressure chamber of the first stage and the suction chamber of the second stage are combined with water cooling at the intermediate chamber (1). The water cooled bars (2) are arranged in the intermediate chamber for heat dissipation at intermediate pressure level.

Description

The invention relates to a cylinder head for a multi-stage piston compressor with arranged in series piston / cylinders.

For multi-stage compressors, it is necessary to provide an intermediate cooler between the compressor stages in order to cool the compressed air in the previous stage. Such intercooler usually consist of a coil, which emits the heat to the ambient air. By this intermediate cooling, an increase in the efficiency of the reciprocating compressor is achieved.

The invention is based on the object to achieve a reduction of the attachments on the reciprocating compressor and a significant improvement in the cooling performance and thus an improvement in the efficiency of the reciprocating compressor.

This object is achieved by a cylinder head having the features of patent claim 1. Further embodiments of the invention will become apparent from the dependent claims.

The cylinder head according to the invention for a multi-stage piston compressor with pistons and cylinders arranged in series is characterized in that the pressure chamber of stage j and the suction chamber of stage j + 1 are combined to form an intermediate chamber with water cooling. The step j stands for any compressor stage of a multi-stage piston compressor and the stage j + 1 for the downstream subsequent stage of the same piston compressor. Of course, the invention also includes an embodiment in which at the same time the suction chamber of the stage j is combined with the pressure chamber of the stage j-1, ie the upstream stage, to an intermediate chamber with water cooling.

By combining the pressure chamber of a first stage with the suction chamber of a second, adjacent stage to an intermediate chamber has several advantages. On the one hand can be dispensed with the conventional intercooler, whereby the multi-stage piston compressor is cheaper and less susceptible to interference. On the other hand, a more compact design can be achieved. Finally, the weight of the multi-stage piston compressor drops.

In one embodiment of the invention, water-cooled webs for heat dissipation at intermediate pressure level are arranged in the intermediate chamber. The webs are used to increase the surface of the inner chamber wall for better heat dissipation.

In a further embodiment of the invention, the webs enclose cavities in the intermediate chamber, which are connected to a cooling water circuit. The amount of heat that can be removed increases in this version due to the constant flow of cooling water.

Advantageously, the housing of the intermediate chamber may be formed as a casting. Castings are sturdy, easy to manufacture and therefore reasonably priced.

In a preferred embodiment, the webs are integrally formed in the casting. In this way it is achieved that for the webs no separate component is needed, so that the cost can be kept low.

In another preferred embodiment, the webs are in the form of a structured intermediate plate formed as a sheet metal part. The use of a sheet metal part is associated with higher costs, since it is a separate component. However, this is the advantage of a significant weight savings over a pure casting. Furthermore, the housing of the intermediate chamber can be given a relatively simple shape, so that the risk of rejects is reduced.

Fig. 1a

eine Schnittdarstellung durch einen mehrstufigen Kolbenverdichter mit gemeinsamer Zwischenkammer mit wassergekühlten Stegen im Gussteil;

Fig. 1b

eine Schnittdarstellung entlang der Linie A - A in Fig. 1a;

Fig. 1c

eine Schnittdarstellung entlang der Linie B - B in Fig. 1b;

Fig. 2a

eine Schnittdarstellung durch einen mehrstufigen Verdichter mit gemeinsamer Zwischenkammer mit einer besonders strukturierten Zwischenplatte als Blechformteil mit angeformten Stegen;

Fig. 2b

eine Schnittdarstellung entlang der Linie A - A in Fig. 2a;

Fig. 2c

eine Schnittdarstellung entlang der Linie C - C in Fig. 2a; und

Fig. 2d

eine Schnittdarstellung entlang der Linie B - B in Fig. 2b.

The invention will be explained in more detail with reference to embodiments and accompanying drawings. Show

Fig. 1a

a sectional view through a multi-stage piston compressor with common intermediate chamber with water-cooled webs in the casting;

Fig. 1b

a sectional view taken along the line A - A in Fig. 1a;

Fig. 1c

a sectional view taken along the line B - B in Fig. 1b;

Fig. 2a

a sectional view through a multi-stage compressor with a common intermediate chamber with a specially structured intermediate plate as sheet metal part with integrally formed webs;

Fig. 2b

a sectional view taken along the line A - A in Fig. 2a;

Fig. 2c

a sectional view taken along the line C - C in Fig. 2a; and

Fig. 2d

a sectional view taken along the line B - B in Fig. 2b.

According to the invention, the pressure chamber of stage j (eg first stage) and the suction chamber of stage j + 1 (eg second stage) of the reciprocating compressor are combined to form a common intermediate chamber 1. In this intermediate chamber 1, the housing 6 is designed as a casting, water-cooled webs 2, 3 or ribs for heat dissipation to intermediate pressure level are arranged.

The intermediate chamber 1 may consist of a casting in which the webs 2 are already incorporated. The webs 2 are hollow and their cavities 4 with a water cycle connected (Fig. 1a to c).

In another embodiment of the invention, a sheet metal part 5 is inserted into the intermediate chamber 1, the housing 6 is a casting, in which the webs 3 are formed. This embodiment is less expensive to implement, since no complicated molds are needed and the sheet metal part can be produced with known techniques of shaping sheet metal parts (Fig. 2a to d).

LIST OF REFERENCE NUMBERS

1

intermediate chamber

2

web

3

web

4

cavity

5

Sheet metal part

6

casing

j

first stage

j + 1

second step

Claims (6)

Cylinder head for a multi-stage piston compressor with in-line piston / cylinders, characterized in that the pressure chamber of the stage (j) and the suction chamber of the stage (j + 1) are combined to form an intermediate chamber (1) with water cooling. Cylinder head according to claim 1, characterized in that in the intermediate chamber (1) water-cooled webs (2, 3) are arranged for heat dissipation to intermediate pressure level. Cylinder head according to claim 2, characterized in that the webs (2, 3) enclose cavities in the intermediate chamber (1), which are connected to a cooling water circuit. Cylinder head according to claims 1 to 3, characterized in that the housing (6) of the intermediate chamber (1) is designed as a cast part. Cylinder head according to claim 4, characterized in that the webs (2) are integrally formed in the casting. Cylinder head according to claim 4, characterized in that the webs (3) are formed in a particularly structured intermediate plate as a sheet-metal shaped part (5).

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