The invention relates to a valve set for piston compressors, with a suction valve and a pressure valve arranged concentrically therewith, each of these valves having a seat plate provided with openings and a valve plate associated with the suction valve and the pressure valve arranged between these two seat plates, which are parallel to one another Extend levels.
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 plates, 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 in the plane in which the valve plate assigned to the suction valve extends, a damper plate extending into the area of the pressure valve for the valve plate assigned to the pressure valve and in the plane in which the valve plate assigned to the pressure valve extends , a damper plate extending into the area of the suction valve for the valve plate assigned to the suction valve and that the valve plate assigned to the suction valve and the damper plate arranged with it in the same plane as well as the valve plate associated with the pressure valve and the damper plate arranged with this in the same plane with their respective adjacent edges between the seat plates are sealed.
By arranging a damper plate to each valve plate, a damping of the opening movement of each valve plate is created in a structurally simple manner, which considerably reduces the risk of it breaking. By fastening all four valve and damper plates together in the area of their mutually facing edges, the diameter of the valve set can also be significantly reduced in comparison with that of the known one, so that the new valve set has a compact design. 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 in that the valve and damper plates arranged in the same plane are first manufactured as one piece, which is then separated into the valve plate and the damper plate with the aid of 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 I-I in Fig. 2 and
2 and 3 each a plan view of the two valve plates with the associated damper plate arranged in the same plane.
1, the valve set consists essentially of two stacked seat plates 1 and 2 and two between them with axial spacing and concentrically attached valve plates 3 and 4. The seat plate 1 forms with its central part and the valve plate 3 together a suction valve for one 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 diffuser-like opening 8 min in the center of the seat plate 2. With the openings 8 and 8 min, openings are aligned in the valve plate 3 and in a damper plate 24 arranged between this and the seat plate 2, which are in the same plane extends like the annular 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 damper plate 24.
The valve plate 3 of the suction valve is surrounded by a concentric annular damper plate 23 for the annular valve plate 4 and extends in the same plane as the valve plate 3. The annular valve plate 4 is pressed against the seat plate 2 by four springs which are not visible in FIG. 1. These springs thus 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 are assigned openings 13 in the seat plate which, corresponding to the openings 8, are offset from the openings 12.
Breakthroughs aligned with the inside openings 13 are located both in the damper plate 23 and in the valve plate 4.
According to FIG. 2, the valve plate 3 is connected for three minutes to an attachment ring for three minutes via four outer link arms. This ring 3 minutes is surrounded by a fastening ring 23 minutes, to which the damper plate 23 is connected on the outside via four link arms 23 minutes.
3, the ring-shaped valve plate 4 is connected on the inside via four link arms 4 min with a fastening ring 4 min min. This ring 4 min min surrounds a fastening ring 24 min min for the damper plate 24 which is connected to the fastening ring 24 min min via four outer link arms 24 min.
1, the fastening rings are clamped gas-tight between the seat plates 1 and 2 for 3 minutes and 23 minutes and 4 minutes and 24 minutes, with 3 minutes, 23 minutes and 4 minutes, 24 minutes between the fastening rings min on the other hand, a spacer ring 25 is inserted. 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 link arms 23 min and 4 min into the fastening ring 23 min and 4 min min, respectively.
The mobility of the valve plate 3 and the damper plate 23 or the valve plate 4 and the damper plate 24 is ensured relative to the associated fastening rings by means of the handlebar arms 3 min and 23 min and 4 min and 24 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.
The valve and damper plates 3, 23 and 4, 24, initially produced as one piece, are divided into the two plate parts 3, 23 and 4, 24 at the end of the processing by a laser cut 32. When cutting the cut 32, which is otherwise made as a circular line, a small, inwardly jumping semicircular movement is carried out, as a result of which the fastening rings have a nose 33 for 4 minutes and 23 minutes, which protrudes into a semicircular groove. This prevents relative rotation of the plates 3, 23 and 4, 24 that belong together during assembly.
In a departure from the exemplary embodiment described, the bulges 17 in FIGS. 2 and 3 can each be shifted counterclockwise up to the 45 ° line, the transition region between the handlebar arms 23 min and 4 min and the damper plate 23 or valve plate 4 being shifted accordingly 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.