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.
Such a valve set is known from Fig. 2 of DE-AS 1 812 580. In this known valve set, one of the two valve plates is ring-shaped and concentrically surrounds the other valve plate. On both valve plates, adjoining link arms are provided, by means of which the valve plates are held axially movable between the seat plates by pins extending through the free ends of the link arms, which are attached in the seat plates. The seat plates themselves are clamped together by a central screw-nut connection.
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 annular 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. It is also possible that the valve plates hit the opposite seat plate hard during their opening movement, which can lead to damage to the valve plates.
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 and that the risk of breakage of the valve plates is reduced.
This object is achieved according to the invention in that the valve plate assigned to the suction valve has a section that extends into the area of the pressure valve, which serves as a damper plate for the valve plate assigned to the pressure valve, and that the valve plate assigned to the pressure valve has a section that extends into the area of the suction valve , which serves as a damper plate for the valve plate assigned to the suction valve. By expanding the valve plates in each case into the valve area to which they are not assigned, a damper plate for the other valve plate, which is integrally connected to it, is created in a structurally simple manner.
Because of the one-piece design of each valve / damper plate, the diameter of the valve set can also be considerably reduced in comparison with that of the known one, so that the new valve set has a compact design.
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 I-I in Fig. 2 and
2 and 3 each a plan view of the two valve plates.
1, the valve set essentially consists of two seat plates 1 and 2 arranged one above the other and two valve plates 3 and 4 arranged between them at an axial distance from one another. The seat plate 1 together with its central part and the valve plate 3 together form a suction valve for one shown compressor, the compression space 5 extends below the seat plate 2. 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 diffuser-like opening 8 min in the center of the seat plate 2. Openings 8 and 8 min are aligned with openings in the valve plate 3 and in the central section 24 of the valve plate 4.
The valve plate 3 of the suction valve is pressed against the seat plate 1 by eight springs 9. The springs 9 are arranged in corresponding recesses 9 min of the seat plate 2 and protrude through holes 9 min in the central part of the valve plate 4.
The annular pressure valve of the valve set is formed by the outer part of the seat plate 2 and the outer part of the valve plate 4 and 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 seat plate 1 over the area of the valve plate 4. 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 aligned with the inside openings 13 are also in the valve plate 4 and in the edge section 23 of the valve plate 3.
This annular section 23 of the valve plate 3, which extends outward into the region of the pressure valve, forms a damper plate for the valve plate 4 of the pressure valve. In a corresponding manner, the section 24 of the valve plate 4 that extends inward into the area of the suction valve forms a damper plate for the valve plate 3.
2, the valve plate 3 is connected via three outer link arms 3 minutes to a fastening ring 3 minutes, to which the damper plate 23, which extends into the area of the pressure valve, is connected outside via link arms 3 minutes.
According to FIG. 3, the valve plate 4 is connected on the inside via four link arms 4 minutes with a fastening ring 4 minutes, to which the damper plate 24, which extends into the area of the suction valve, is connected on the inside via four link arms 4 minutes.
1, the fastening rings are clamped gas-tight between the seat plates 1 and 2 for 3 minutes and 4 minutes, a spacer ring 25 being inserted between the plates 3, 23 and 4, 24. 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 (FIGS. 2 and 3) for the screws 16 is provided in each case in the transition region of the handlebar arms for 3 minutes and 4 minutes in the fastening ring for 3 minutes and 4 minutes, respectively. The movement of the valve plate 3 and the damper plate 23 or the valve plate 4 and the damper plate 24 relative to the fastening ring 3 min or 4 min min is ensured by means of the link arms 3 min and 3 min min min as well as 4 min and 4 min min.
The damper plate 23 has four bulges 18 distributed over the circumference (FIG. 2), through which extend the springs (not shown) which press the valve plate 4 against 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 against the damper plate 24, so that the gas passes through the openings 6 and 8 into the compression space 5 arrives. Towards the end of the compression phase, the compressed gas flows out of the compression space 5 via the openings 12 and 13 in the direction of the arrow 14, the valve plate 4 lifting off from the seat plate 2 and resting on the damper plate 23. 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.
In a departure from the exemplary embodiment described, the bulges 17 in FIG. 2 and counterclockwise can each be shifted up to the 45 ° line, the transition region between the handlebar arms being 3 minutes or 4 minutes and the damper plate 23 or the valve plate 4 accordingly is also moved or is dimensioned somewhat narrower than in Fig. 2 or 3. 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. The same applies analogously to the valve plate 4.