DD290240A5 - LAMELLEN VALVE FOR KAELTEMITTELHUBKOLBENVERDICHTER - Google Patents

Abstract

The invention relates to a lamellae valve for reciprocating compressor compressor, which, moreover, can be used for all other compressors, which are equipped with finned valves at least on the pressure side. The object of the invention is to reduce the dead space ratio of the compressor without degrading the Stroemungsverhaeltnisse. The inventive solution provides to attach a cone made of a material of low mass to the pressure valve blade, which almost completely fills the passage opening for the compressed gas in the closing position of the valve. Fig. 1 {Hubkolbenkaeltemittelverdichter; Reed valve; Schadraumverhaeltnis; Pressure valve plate; Durchtrittsoeffnung; Compressed gas; Valve seat plate; push fitting}

Description

According to the invention, the object is achieved in such a way that a conical shaped piece is attached to the pressure valve blade, which in the closed position of the pressure valve blade almost completely fills the likewise conical passage opening for the compressed gas in the valve seat plate. The tapered fitting does not rest against the conical walls of the openings and thus absorbs no forces from differential pressure and valve closing. The gap between the conical shaped piece and the wall is minimized to the smallest value by taking into account only the required influences from different thermal expansions and from the manufacturing tolerances.

The thickness of the tapered fitting is chosen equal to the thickness of the valve seat plate.

In order not to adversely affect the dynamic behavior of the pressure valve lamella by the mass of the tapered fitting, a specifically lightweight material is selected for the fitting, which at the same time with sufficient strength withstands the temperature of the pressurized gas, e.g. Alloy or plastic.

To attach the tapered fitting to the Druckventillamelle this is provided centrally above the center of the passage opening with a bore. As a result, the riveting or screwing of the fitting on the blade is possible. When using a sprayable plastic material for the fitting this can be injected integrally on both sides of the lamella and through the hole. The cone angle of the fitting and passage opening in the valve seat plate match and are optimally chosen so that at the specified maximum valve lift the gap cross-section between the fitting and the wall is at least equal to the Hubspaltquerschnitt that results between valve seat plate and lamella at the largest diameter of the passage opening.

The Hubfänger is provided with an opening into which the fastening element of the tapered fitting fitted, so that the free movement of the blade between the valve seat plate and Hubfänger is ensured. In addition, the Hubfänger is to be designed so that its curvature is in the range between the given by the clamping bending edge and the beginning of the largest diameter of the passage opening in the valve seat plate and the further area adjoins tangentially then as an unbroken section.

The Saugventillamelle the valve can be maintained in the usual way I-, U- or other suitable form, since the openings for the suction gas in the valve seat plate do not contribute to the dead space of the compressor. The piston can also be increased in the not covered by the or the Saugventillamellen areas partially or completely to the extent of the thickness of Saugventillamellen in usually, so that the consequent dead space is also reduced.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawings show

Fig. 1: a valve with a closed suction and pressure valve blade in longitudinal section of the side view, Fig. 2: a valve with closed suction and open Druckventillamelle in a longitudinal section of Seitenaniiuht, Fig. 3: the view of the Druckventillamelle with the conical shaped piece of the Cylinder side off.

The view of FIG. 1 shows a valve according to the invention, consisting of au? Valve seat plate 1, Saugver.tillamelle 2 and Druckventillarmlle 3 with the tapered fitting 4 and the Hubfänger 5 for the pressure valve lamella. Below the valve seat plate 1, the piston 6 is shown in its uppermost position (dead center) with the increase 7 corresponding to the thickness of Saugventillamelle 2 in the cylinder liner 8. The wall 9 of the cylinder head separates the suction chamber 12 and the pressure chamber 13 from each other.

The view of FIG. 2 shows the same valve during the ejection phase of the piston 6 with opened pressure valve cam 3, which rests on the Hubfänger 5. The pressurized gas flows from the cylinder 11 into the pressure space 13 in the gap 10, which forms between the conical shaped piece 4 and the conical passage opening in the valve seat plate 1.

FIG. 3 shows the pressure valve lamella 3 in the view from the cylinder 11 with the conical shaped piece 4.

Claims (3)

1. vane valve for reciprocating refrigerant compressor, consisting of one or more suction and pressure valve lamellae and oiner common valve seat plate, characterized in that on the pressure valve lamella (3) a conical molding (4) is mounted, in the closed position of the pressure valve lamella (3) the passage opening for the compressed gas almost completely fills. 2. vane valve according to claim 1, characterized in that the conical shaped piece (4) made of a material of low mass, for. As light metal or highly cross-linked plastic exists. 3. Larnellenventil according to claim 1 and 2, characterized in that the Hubfänger (5) at least in the region of the conical shaped piece (4) has no curvature. For this 1 page drawings Field of application of the invention The invention is preferably applicable to vane valves of reciprocating refrigerant compressors. Moreover, the invention is suitable for all other types of compressor in which fin valves are used at least on the pressure side, e.g. Air compressor in reciprocating design or refrigerant compressor in rotary piston design. Characteristic of the known state of the art It is the usual design of the lamella valves for reciprocating refrigerant compressors known in which suction and pressure blades are arranged on a common valve seat plate. This design has proven itself and has led to energetic and reliability optimal designs. The disadvantage of this construction is that the passage opening for the compressed gas in the valve seat plate increases the dead space of the compressor and therefore, especially at high pressure conditions, as they occur in refrigerant compressors for low evaporation temperatures, poor cylinder filling is the result. To minimize this disadvantage, the valve seat plate is made as thin as possible, but this brings problems in ensuring the required flatness during manufacture and during operation with it. For reasons of strength anyway a certain minimum thickness of the valve seat plate can not be exceeded, so that always a residual amount of damage remains. Another possibility for reducing the dead space portion of the pressure valve is the reduction of the seat and Hubspaltquerschnittes the pressure valve, creating increased pressure losses. This also leaves a residual amount of damage. A further reduction of this residual charge proportion was achieved in special constructions by design of the piston crown in the manner that protrude projections of the piston in the compressed gas passage openings and thus reduce most of the dead space in the piston dead center. However, this solution is limited for technological reasons to compressed gas passage openings which are concentric with the cylinder center. In addition, this results in the need to make the piston projection in the manner conical, that it tapers towards Druckventillamelle, whereby in the valve gap, which has the largest share for the pressure loss of the valve, a high flow velocity and strong beam deflection occurs. The still remaining residual charge proportion is determined by the unavoidable manufacturing tolerances in both the radial and axial directions, the axial portion contributes not insignificantly because of the long tolerance chain. The most effective reduction of the dead space fraction of the compressed gas passage opening is achieved with the so-called Discus > according to US Patent No. 4470774 by a conical valve disk in a conical compressed gas passage bore sits in such a form-fitting manner that it takes over the seal in the closed state. The feathering takes place with a coil spring, which is supported on a special Hubfänger, which also assumes the leadership function for the valve disk. This also a favorable flow guidance in the open state, ie an energetically advantageous design is achieved. This is offset by the disadvantage that the valve disc record both the stress from the pressure difference between the pressure and suction side and from the impact process at the valve closing and therefore must consist of a high quality, but lightweight material. In addition, the pressure side of the small and medium-sized compressors must be left structurally simple Lamellenventilausführung. Object of the invention The object of the invention is to provide a louvered valve for reciprocating refrigerant compressors, which maintains the advantageous blade design of the pressure valve and at the same time reduces the proportion of the dead space, which is formed by the passage opening for the compressed gas in the valve seat plate to a minimum. Essence of the invention The invention has for its object to design a blade valve for reciprocating refrigerant compressor so that the combination of the advantages of the known solutions is achieved in such a way that the pressure side creates a minimal dead space, while a material-economical, manufacturing technology and energy optimum can be achieved.