JPH0230700Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a refrigeration system that uses a float valve for turning on and off the refrigerant circuit of a refrigerator, a storage case, etc.

Configuration of a conventional example and its problems A conventional refrigeration system using a float valve will be explained with reference to FIG.

The high temperature and high pressure refrigerant compressed by the compressor 1 is
It is liquefied in a condenser 2, passes through a dryer 3 and a float valve 4', is depressurized in a capillary tube 5, is evaporated at a predetermined temperature in an evaporator 6, and returns to the compressor 1. The cycle is repeated. This float valve 4' includes a float valve outer shell 4a', a float 4b', a valve part 4c', and a valve seat part 4.
d', a valve hole 4e', and when the compressor 1 is operating, liquid refrigerant cooled by the condenser 2 accumulates in the float valve outer shell 4a', and when the liquid level reaches a predetermined level, The float 4b' floats due to the buoyant force, operating the valve portion 4c' in the opening direction, sending liquid refrigerant to the capillary tube 5, and evaporating it in the evaporator 6 to perform a normal cooling action. When the compressor 1 is stopped, no liquid refrigerant is supplied to the float valve 4', and the liquid level drops and the float 4b' also drops, causing the valve portion 4c' to hit the valve seat portion 4d' and close the valve hole 4e'. Therefore, the high-pressure two-phase refrigerant (mainly gas) no longer flows to the evaporator 6 side. This prevents refrigerant gas that does not have a refrigeration effect from flowing to the evaporator 6 side due to back pressure while the compressor 1 is not operating and causing the evaporator temperature to rise, increasing the operating efficiency of the refrigeration system. .

However, in general, for valves such as float valves or electromagnetic valves, a small amount of leakage at the valve closing temple is often allowed in consideration of production yield. Particularly in the case of a float valve, if the valve hole is completely sealed when the valve is closed, no refrigerant will be supplied at all, resulting in a situation where the float valve loses its ON-OFF operation function. For this reason, leakage is made from the valve portion to an extent that does not cause any functional problems, so that the refrigerant liquid can easily flow to the float valve. However, even if the specification allows leakage from the valve hole to an extent that does not pose a functional problem, under the various pressure conditions under which the refrigeration equipment is operated, the valve hole will be almost completely sealed under pressure conditions of high pressure and low pressure. This has the disadvantage that the float valve may not function properly.

Purpose of the invention The purpose of the invention is to ensure reliable operation of a float valve that opens and closes a refrigerant circuit.

Structure of the invention The present invention sequentially connects a compressor, a condenser, a float valve, a capillary pipe, an evaporator, etc., and the float valve is provided with a valve seat part at the bottom having a valve hole communicating with the capillary pipe, and A float valve outer shell for storing liquid refrigerant flowing out from the condenser inside, and a valve portion for closing the valve hole are provided at the lower part, and the liquid level of the liquid refrigerant accumulated in the float valve outer shell reaches a predetermined liquid level. and a float that floats due to buoyancy due to the liquid refrigerant accumulated in the float valve outer shell and opens the valve hole and sends the liquid refrigerant in the float valve outer shell to the capillary pipe. A fine hole is formed through which the liquid refrigerant accumulated in the outer shell of the float valve flows toward the capillary tube when the valve hole is closed.

DESCRIPTION OF EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to FIG. Note that parts that are the same as those in the conventional example described above are designated by the same numbers, and a description thereof will be omitted, and the description will focus on the different parts.

The high temperature and high pressure refrigerant compressed by the compressor 1 is
It is liquefied in a condenser 2, and then sent to a dryer 3 and a float valve 4.
The pressure is reduced by the capillary tube 5, and the pressure is reduced by the evaporator 6.
It evaporates at a predetermined temperature and returns to the compressor 1. Here, the valve part 4c of the float valve 4 is provided with a fine hole 4f that connects the liquid part in the float valve and the valve hole 4e of the valve seat part 4d, and this bypass hole is a fine hole that connects the float valve outer shell 4a. When the float 4b is floating inside the float, no flow occurs, and when the valve is closed, a minute amount of flow flows, which is designed so as not to interfere with the intended function of the float valve.

In such a configuration, when the compressor 1 is operated, the liquid refrigerant cooled by the condenser 2 flows between the float 4b and the float valve outer shell 4a and accumulates on the valve seat 4d, causing the float 4b to float and drop to the liquid level. A minute amount of refrigerant flows to the capillary tube 5 side through the minute hole 4f until reaching the level. Therefore, float 4
The high pressure on the upper side of valve b escapes to the valve hole 4e side, and the difference between high and low pressures becomes small. Then, a predetermined amount of liquid refrigerant accumulates inside the float valve 4, causing the float 4b to float, causing the valve portion 4 to float.
When c is operated in the opening direction, liquid refrigerant does not flow from the micro holes 4f, and the normal cooling cycle explained in the conventional example is performed, and the refrigerant flowing through the micro holes 4f fulfills the intended function of the float valve application. This is to the extent that it does not interfere with the flow, thereby ensuring float operation in the next cycle.

Effects of the invention As described above, the present invention connects a compressor, a condenser, a float valve, a capillary pipe, an evaporator, etc. in sequence, and the float valve has a valve seat portion at the bottom having a valve hole communicating with the capillary pipe. A float valve outer shell is provided at the bottom of the float valve outer shell for storing the liquid refrigerant flowing out from the condenser, and a valve portion for closing the valve hole is provided at the lower part. and a float that floats on the liquid refrigerant that collects in the outer shell of the float valve when it reaches the surface level and opens the valve hole and sends the liquid refrigerant in the outer shell of the float to the capillary pipe, and , when the valve hole is closed,
Since the float valve has minute holes that allow the liquid refrigerant accumulated in the outer shell to flow to the capillary tube side, the function of the float valve can be performed without any trouble even under various operating conditions of the refrigeration equipment. This has the effect of greatly contributing to reducing the power cost of the refrigeration system.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional refrigeration system, and Figure 2 is a schematic diagram of a conventional refrigeration system.
1 shows a schematic diagram of a refrigeration system according to an embodiment of the present invention. 1... Compressor, 2... Condenser, 4... Float valve, 4f... Fine hole, 6... Evaporator.

Claims (1)

[Scope of utility model registration request] It has a refrigerant circuit in which a compressor, a condenser, a float valve, a capillary pipe, and an evaporator are sequentially connected, and the float valve is provided with a valve seat part at the bottom having a valve hole communicating with the capillary pipe, and the float valve is connected to the condenser. A float valve outer shell that stores liquid refrigerant flowing out from the float valve, and a valve portion that closes the valve hole at the bottom thereof, and when the liquid level of the liquid refrigerant accumulated in the float valve outer shell reaches a predetermined liquid level, the float valve a float that floats due to the buoyancy of liquid refrigerant accumulated in the valve outer shell to open the valve hole and send the liquid refrigerant in the float valve outer shell to the capillary pipe,
A refrigeration system in which a fine hole is formed in the valve portion to allow liquid refrigerant accumulated in the outer shell of the float valve to flow toward the capillary tube when the valve hole is closed.