CH674757A5

CH674757A5 -

Info

Publication number: CH674757A5
Application number: CH176/88A
Authority: CH
Inventors: Hans Meier; Marcel Pawlicek
Original assignee: Burckhardt Ag Maschf
Priority date: 1988-01-19
Filing date: 1988-01-19
Publication date: 1990-07-13
Also published as: BR8900189A; GB2214615A; BE1001997A3; ATA589A; IT1228285B; FR2626045A1; GB8901169D0; IT8919017D0; FR2626045B1; AT403190B; GB2214615B

Abstract

The valve set for a reciprocating compressor consists of an inlet valve and a delivery valve disposed concentrically thereto, each of these valves having a respective seat plate (1, 2) formed with perforations 6 and 12 and an associated spring biassed annular valve plate (3, 4). Each valve plate is connected via at least one associated link (4', 3') to a respective closed ring (4'', 3''), and the closed rings are sealingly secured between the seat plates. <IMAGE>

Description

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The invention relates to a valve set for piston compressors, with a suction valve and a pressure valve arranged concentrically thereto, each of these valves having a seat plate provided with openings and a valve plate associated with the suction valve and the pressure valve being arranged between these two seat plates, each of which has at least one a handlebar is held between the seat plates.

Such a valve set is known from FIG. 2 of DS-AS 1 813 580. In this valve set, the two seat plates are clamped together by a central screw-nut connection, and the handlebar arms connected to the outside of the two valve plates are held at their free ends by pins which are attached to the seat plates. There is a relatively large radial distance between the pins that hold the handlebar arms of the inner valve plate and the inner edge of the outer valve plate, and a seal must also be provided in this area between the two seat plates in order to separate the suction valve from the pressure valve in a gas-tight manner. This design of the valve set requires a relatively large diameter of the valve set, which is associated with a correspondingly large space requirement on the compressor.

The invention has for its object to improve a valve set of the type mentioned so that its diameter and thus its space requirements are reduced.

This object is achieved according to the invention in that the inner edge of the outer valve plate and the outer edge of the inner valve plate each have a closed ring which is connected to the associated link and that the two valve plates are sealingly fastened to these two closed rings between the seat plates. By providing the mutually adjacent closed rings, which can be of relatively small dimensions, the fastening of the two valve plates between the seat plates can be concentrated on a narrow ring area, as a result of which the largest diameter of the valve set can be considerably reduced compared to that of the known one. In addition, a central screw connection of the seat plates can be omitted, which also has the effect of reducing the diameter, since the space freed up in the center of the valve set is now available for the gas flow. The production of the new valve set is very simple by first manufacturing the two valve plates as one piece, which is then separated into the two valve plates using a laser cutting process.

An embodiment of the invention is explained in more detail in the following description with reference to the drawing. Show it:

Fig. 1 shows a section through a valve set along the line l-l in Fig. 2 and

FIG. 2 shows a plan view of the two valve plates arranged one inside the other on a somewhat smaller scale than in FIG. 1.

1, the valve set consists essentially of two superimposed seat plates 1 and 2 and two concentric valve plates 3 and 4 mounted between them. The seat plate 1 forms with its central part and the inner valve plate 3 together a suction valve for a compressor, not shown whose compression space 5 extends below the seat plate 2. A pressure valve which is annular in cross section is formed by the outer ring part of the seat plate 2 and the annular valve plate 4. The seat plate 1 has slot-like openings 6 in its central part, which run on circular arcs concentrically to the central axis 7 of the valve set, but do not extend over an entire circumference. In Fig. 1 below the central part of the seat plate 1, slot-like openings 8 are provided in the seat plate 2, the course of which is identical to that of the openings 6, but are offset outwards by half a radial division to the openings 6. The openings 8 widen towards the compression space 5 in a diffuser-like manner. In addition, there is a diffusor-like opening 8 'in the center of the seat plate 2. With the openings 8 and 8', openings 20 are aligned in the valve plate 3.

The valve plate 3 of the suction valve is pressed against the seat plate 1 by eight springs 9. The distribution of the springs 9 over the valve plate 3 is indicated in FIG. 2 by dashed circles. The springs 9 are arranged in corresponding recesses 9 'of the seat plate 2. The gas to be compressed flows in the direction of arrow 10 through the central part of the seat plate 1, the valve plate 3 being moved downward against the force of the springs 9, so that the gas passes through the openings 6 and 20 and 8 and 8 'in the Compression chamber 5 arrives.

The annular pressure valve of the valve set concentrically surrounds the suction valve. The valve plate 4 is pressed against the seat plate 2 by four springs which are not visible in FIG. 1. These springs correspond to the springs 9, but are distributed in the upper seat plate 1 over the area of the valve plate 4 (dashed circles in FIG. 2). The seat plate 2 also has slot-shaped openings 12 corresponding to the openings 6 in the seat plate 1, which likewise run on an arc of a circle, but do not extend over the entire circumference. The openings 12 in the seat plate 1 are assigned openings 13. Breakthroughs 21 that are aligned with the inside openings 13 are located in the valve plate 4. During the compression phase, the compressed gas flows out in the direction of the arrow 14 while the valve plate 4 is lifted off the seat plate 2. The supply of the gas to be compressed (arrow 10) and the discharge of the compressed gas (arrow 14) are separated by an annular, closed wall, which is indicated in FIG. 1 by the dash-dotted lines 15.

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2, the valve plates 3 and 4 are arranged concentrically one inside the other. The outer valve plate 4 is connected to an inner, closed fastening ring 4 "via four link arms 4 '. The inner valve plate 3 is connected in a similar manner to an outer fastening ring 3" via four outer link arms 3'.

1, the closely adjacent fastening rings 3 "and 4" are clamped between the seat plates 1 and 2. The clamping force is applied by means of four screws 16, only one of which is visible in FIG. 1 and with which the seat plates 1 and 2 are clamped together. A semicircular bulge 17 (FIG. 2) for the screws 16 is provided in each case in the transition region of the link arms 4 'into the fastening ring 4 ". The mobility of the valve plate 3 or 4 relative to the fastening ring 3" is increased by means of the link arms 3' and 4 '. or 4 "ensured.

The valve plates 3 and 4, which are initially produced as one piece, are divided into two plate parts at the end of the processing by a laser separating cut 22, a small inwardly jumping semicircle 23 being provided through which the fastening ring is made in the course of the cut, which is otherwise made as a circular line 4 "receives a nose that protrudes into a semicircular groove. This prevents relative rotation of the two plates 3 and 4 during assembly.

In a departure from the exemplary embodiment described, the bulges 17 in FIG. 2 can each be shifted counterclockwise up to the 45 ° line, the transition region between the link arms 4 ′ and the valve plate 4 being shifted accordingly or being dimensioned somewhat narrower than in FIG. 2 . An embodiment modified in this way has the advantage that, for example, the valve plate 3 - if it shows signs of wear on the surface interacting with the seat plate 1 - can be turned so that the surface previously in contact with the springs 9 then interacts with the seat plate 1.

Claims

Claims

Valve set for piston compressors, with a suction valve and a pressure valve arranged concentrically to it, each of these valves having a seat plate (1, 2) provided with openings (8, 13) and between each of these two seat plates, a valve plate (3) assigned to the suction valve and the pressure valve , 4), each of which is held between the seat plates (1, 2) via at least one link (3 ', 4'), characterized in that the inner edge of the outer valve plate (4) and the outer edge of the inner Valve plate (3) each have a closed ring (4 ", 3") connected to the associated link (4 ', 3') and that the two valve plates (3, 4) on these two closed rings (3 ", 4") ) between the seat plates (1, 2) are sealed.

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