DE1024763B - Automatic valve, especially pressure valve, preferably for motor compressors for hermetically sealed small refrigeration machines - Google Patents

Description

The invention relates to an automatic valve, in particular a pressure valve, preferably for motor compressors for hermetically sealed small refrigeration machines, consisting of one valve opening in one Rectangular valve plates covering the seat plate as well as a lift stop and one serving as a closing spring corrugated leaf spring, all parts mentioned are forcibly guided in the direction of the valve lift. In the known valves of this type, the corrugated leaf spring is in each case with the free end a small keyway-shaped recess, in which also the one arranged below rectangular valve plate with its end sections extends in this way to an unwanted Moving these two elements out of the predetermined, for the correct function of the valve important situation to be excluded with certainty. These guide grooves have it directly at the open end with a wider rectangular recess on the sides The narrower valve plate rests at the bottom, so that there is enough free space on the long sides of this recess Space remains to ensure unhindered passage for the medium to be conveyed.

For practical use, the known valve arrangement is flawed, which its Use in motor compressors for small refrigeration machines that work perfectly Valve mechanism require, exclude. These shortcomings are both manufacturing and functional Respect to behold.

After the mentioned grooves for the forced guidance of the valve plate and on the latter directly with its end sections resting corrugated leaf spring only a very small depth in comparison to the total length of these two elements and the width dimension of the latter to that of the guide groove is matched fairly precisely, it follows from the fact that the leaf spring and the valve plate, which usually represent raw stamped parts, a subsequent processing and subsequent dimensional control need to ensure their later effortless installation, which, however, increases the cost this part brings with it. Since the surface delimiting the groove below is in the same plane with the Surface of the seat plate must be in order to have a perfect To ensure the function of the valve, the production of the guide groove is difficult and expensive ", because it can only be produced by means of a shaping machine, the just mentioned lower boundary surface, the adjoining side surfaces and the base of the groove formed two right-angled corners even have to be worked out by hand.

Automatic valve,

especially pressure valve,

preferably for motor compressors

for hermetically sealed

Small refrigeration machines

Applicant:

Stempel-Hermetik GmbH,
Frankfurt / M.-South 10,
Hedderichstrasse 106-114

Rudolf Hintze, Neuenhain via Bad Soden (Taunus),
has been named as the inventor

The functional disadvantage, however, is that due to the narrow guidance of the spring ends, both in width and in length, there is a constant risk of jamming of the same is, especially when the valve already exceeds a relatively small stroke, there here the end faces of the corrugated leaf spring, which naturally becomes longer during the valve stroke, to the Abut the base of the grooves so that jamming of the same cannot be avoided and the valve plate is then without the required spring loading. But after that with the compressor For refrigeration machines, the pressure valve plate is almost regularly expected to stroke excessively must be because, as is well known, not only gasified refrigerant is conveyed by the compressor piston is, rather also wet vapors mixed with lubricating oil or even liquid refrigerant, the one The valves described above make it necessary to have a larger valve lift when ejecting the mixture with a corrugated leaf spring is not suitable for a refrigeration compressor, which is why the same is used in the Refrigeration engineering does not exist either.

The invention has set itself the task of the known automatic valve, in particular pressure valve, by eliminating the aforementioned difficulties and deficiencies so that thereby also the possibility of using this valve in motor compressors for refrigerating machines is created. According to the invention this is achieved in that the leadership of the leaf spring through each one approximately perpendicular in the area of their end sections

709 880/235

arranged straight guide piece is formed, which are dimensioned so that they adjoin the Penetration of the guide holes provided in the lift stop and valve plate into corresponding ones Reach into the blind holes provided in the seat plate. In a further embodiment of the invention the two Führuiigsstücke each consist of one from the leaf spring, leaving one behind corresponding opening cut out to a straight base line and then after the Feather underside towards approximately right-angled conical tongue.

In the drawing, the valve according to the invention is illustrated using an exemplary embodiment, wherein

Fig. 1 shows a longitudinal section through the cylinder head of the compressor with built-in pressure valve, while

Fig. 2 shows the corrugated leaf spring in the relaxed state in elevation and

Fig. 3 shows a plan view of the leaf spring.

In Fig. 1, the compressor cylinder is denoted by 1, the seat plate by 2, the cylinder cover by 3 and the sealing plate inserted between the latter two by 4. The pressure valve built into the cavity between the seat plate 2 and the inner surface of the cylinder cover 3 consists of the valve plate 5, the lift stop 6 and the corrugated leaf spring 8, which with the corrugated part Sa on the cylinder cover 3 and the end sections 8 b on the lift stop Q supports.

According to the invention, the leaf spring has guide pieces 10 in the region of the end sections. The same are each formed from a punched out of the material of the spring leaf tongue 10 α , which are bent at the foot lines 10 c approximately at right angles to the underside of the spring leaf 8 and are suitably made slightly tapered towards the free end, as shown in detail Fig. 2 and 3 can be seen. In terms of length, however, the tongues 10 α are dimensioned so that, after penetrating the guide holes in the lifting catcher 6 and valve plate 5, they still protrude a certain distance beyond the latter. When assembling the valve, this end piece of each tongue extends into a blind hole 11 in the seat plate 2 with sufficient play, which ultimately ensures that the valve plate and lift stop, including the valve spring itself, are properly guided and secured in position with the least amount of material and labor.

Claims (2)

Patent claims: 1. Automatic valve, especially pressure valve, preferably for motor compressors for Hermetically sealed small refrigeration machines, consisting of a valve opening in a Rectangular valve plates covering the seat plate as well as a lift stop and a closing spring serving corrugated leaf spring, with all parts mentioned in the direction of the valve lift are positively driven, characterized in that the leadership of the leaf spring (8) by one im Area of their end sections formed approximately vertically arranged straight guide piece (10) is, which are dimensioned so that they subsequently to the penetration of the in the lifting catcher (6) and valve plate (5) provided guide holes in the corresponding in the Reach into the blind holes (11) provided for the seat plate (2). 2. Automatic valve according to claim 1, characterized in that the two guide pieces (10) each cut out from one of the leaf spring (8) leaving a corresponding opening (IQb) up to a straight base line (10 c) and then afterwards on this consist of the underside of the spring bent approximately at right angles conical tongue (10 a). Considered publications:
U.S. Patent Nos. 2,353,751, 2,353,967, 626,798. 1 sheet of drawings © 709 880/235 2.58