DE721952C - Float valve for compression refrigeration machines - Google Patents

Description

Float valve for compression refrigeration machines For compression refrigeration machines a refrigerant that is below the Action of a compressor in the evaporator housed in the actual cold room arrives, evaporates there and is then conveyed into a condenser. In the condenser The conversion of the gaseous refrigerant into the liquid now takes place again State to be fed back to the evaporator. Through the between Pressure differences existing on the pressure and suction side of the compressor, it is necessary to to provide a throttle device between the condenser and the evaporator, which is usually represented by a float valve. For the operation of Refrigeration machines, it is now desirable that the float valves used a have high responsiveness.

A float valve has already become known, the one in the lower Has part narrowed housing, but is between the float bladder and the housing wall a considerable gap, with a special guiding of the swimmer's bladder becomes necessary. The frictional forces occurring in the guide increase the responsiveness this known valve is greatly reduced.

It is also still a control valve for the refrigerant flow to the Evaporator of a refrigeration system became known in which the between the container and the float located free cross section is relatively narrow, so that even slight fluctuations in the amount of refrigerant in the container size Bring about changes in the liquid level and thus also large adjustment movements and forces can generate. With this control valve, however, there is the possibility of that the float tilts against the housing wall and, as a result, large frictional forces occur, which again greatly reduce the response sensitivity of the valve.

The invention is now based on the object of a float valve for compression refrigeration machines, the housing of which tightly encloses the float bladder, to create that has a particularly high sensitivity. To this Purpose is formed according to the invention, the float valve so that the lower part the two-part bladder, the diameter of which is greater than its height, with greater wall thickness than the upper part is carried out, so that the focus of the The bladder is below the level of the liquid. Because of the low height of the bladder A large gas space is created above it. But this in turn offers the The advantage is that when the machine starts up, the compressor over the Condenser in the float housing pressed amount of liquid are absorbed can. The float valve therefore responds quickly. By the further invention Design of the swimmer's bladder with regard to its center of gravity results in a great moment of stability of the bladder, avoiding the inclination of the bladder and a inclined position to the housing wall is prevented. The friction between the housing wall and As a result, the bladder is greatly reduced, and with it the responsiveness of the Valve continues to increase.

It is also advantageous to use the feed pipe for the from Use condenser incoming cold liquid in the upper part of the housing and close to the bladder. The feed pipe then forms a stop for the bladder when the machine falls. Damage to the one attached to the bladder Valve lever is thus made impossible.

According to the invention, the one that tightly encloses the bladder can also advantageously be used Lower housing part with a recess on one side to accommodate the valve and the the connection between the bladder and valve producing lever must be provided. Through this the result is a particularly high response sensitivity, because that up to the first time Lifting the swimmer's bladder, the amount of liquid to be filled in is kept as small as possible. Further advantageous details of the invention are described below.

In the drawing, the subject matter of the invention is illustrated by way of example.

The housing i of the float valve consists of a lower part e and an upper part 3. The lower part 2 contains in a known manner in a recess the actual valve ii and the lever connected to the float bladder .I 5. In addition, the lower part 2 tightly encloses the swimmer's bladder .4, which after the Invention is designed such that its center of gravity is below the liquid level 6 lies. Does this mean that the swimmer's bladder4 consists of an upper part? and a base 8, the lower part 8 being designed with a greater wall thickness than the upper part 7 is. The line 9 leads to the evaporator.

The upper part 3 of the housing i is expanded with respect to the lower part 2 and thus forms a large gas space. The condenser protrudes into the gas space incoming supply pipe io for the liquid refrigerant and is carried out so far, that it: .i near the swimmer's bladder q. is located. When the machine falls forms the pipe io for the float bladder q. a stop. This will cause damage the lever ö and the valve ii avoided.

Claims (3)

PATENT CLAIMS: i. Float valve for compression refrigeration machines, whose housing tightly encloses the float bladder, characterized in that the Lower part of the two-part bladder, the diameter of which is greater than its height is, is designed with a greater wall thickness than the upper part, so that the focus the bladder is below the fluid level. `- 2. Valve according to claim i, characterized in that the feed pipe inserted in the upper part of the housing for the cold liquid coming from the condenser is brought close to the bladder is. 3. Valve according to claim x and 2, characterized in that the bladder tightly enclosing lower housing part with a recess on one side for receiving of the valve and the lever that establishes the connection between the bladder and the valve is provided.