JPH0113967Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a refrigeration system that uses a float valve to open and close a refrigerant circuit in refrigerators, storage cases, etc. The purpose is

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, and then sent to a dryer 3 and a float valve 4.
It is depressurized in the capillary tube 5, evaporated at a predetermined temperature in the cooler 6, and returned to the compressor 1.
This freezing cycle is repeated.

Here, the compressor 1 is ON-OFF controlled by detecting the air temperature inside the refrigerator or the surface temperature of the cooler 6. Further, the float valve 4 includes a float valve outer shell 4a,
It is composed of a float 4b, a valve part 4c, a valve seat part 4d, and a guide pin 4e, and when the compressor 1 is in operation,
The liquid refrigerant cooled by the condenser 2 accumulates, and when the liquid level reaches a predetermined level, the float 4b is lifted by buoyancy.
is lifted, and the valve part 4c is separated from the valve seat part 4d, and the valve is operated in the opening direction, and liquid refrigerant is sent to the capillary tube 5 to perform a normal cooling action. However, compressor 1
When the float valve 4 is stopped, no liquid refrigerant is supplied to the float valve 4, the liquid level drops, the float 4b also drops, the valve portion 4c comes into contact with the valve seat portion 4d, and the valve moves in the closing direction. Therefore, the high-pressure two-phase refrigerant (mainly gas) no longer flows to the cooler 6 side. This prevents refrigerant gas that does not have a refrigeration effect from flowing to the cooler 6 side due to back pressure while the compressor 1 is stopped and the temperature of the cooler 6 increases, increasing the operating efficiency of the refrigeration system. ing. The above-mentioned guide pin 4e regulates the attitude of the float 4b and allows the valve portion 4c and the valve seat portion 4d to
This is to make it easier to maintain the regular positional relationship.

In such a configuration, the float valve 4 is often installed in a machine room of a refrigerator, a storage case, etc., where the temperature is relatively high. Furthermore, since the float valve 4 incorporates the float 4b, its volume tends to be large and the amount of heat absorbed tends to be large.

For this reason, the refrigerant liquid from the dryer 3 tends to evaporate to some extent within the float valve 4, and as this evaporated gas increases within the float valve 4, the force to float the float 4b decreases, causing the refrigerant from the dryer 3 to evaporate to some extent. The problem is that it becomes difficult to flow, and the refrigeration action cannot be carried out smoothly.

The present invention is intended to eliminate the above-mentioned drawbacks, and the configuration of one embodiment of the present invention will be explained below with reference to FIG. 2. In the figure, parts that are the same as those in FIG. 1 are given the same numbers, and only the differences will be explained. Reference numeral 4e' denotes a guide pin made of a thermally conductive material, and is formed in a substantially U-shape, and the closed end 4e'' passes through the float outer shell 4a and connects the float valve 4.
It extends outside. 7 is a suction pipe returning from the cooler 6 to the compressor 1. This suction pipe 7 and guide pin 4
The closed end 4e'' of e' is in heat exchange contact with the heat exchanger 8, and uses the cold return gas from the cooler 6 to cool the guide pin 4e' formed of a thermally conductive material. , and finally the entire float valve 4 is cooled down.

In other words, the refrigerant is compressor 1 → condenser 2 → dryer 3
→ Float valve 4 → Capillary tube 5 → Cooler 6 → Suction pipe 7 → Compressor 1. During operation of compressor 1, liquid refrigerant cooled by condenser 2 accumulates in float valve 4 and flows through float 4b. By floating and opening the valve, liquid refrigerant is sent to the capillary tube 5 to perform normal cooling action. Also, when the compressor 1 stops, liquid refrigerant is not supplied to the float valve 4, so the float valve 4
b is lowered to close the valve and prevent refrigerant gas having no refrigerating effect from flowing from the capillary tube 5 to the cooler 6. If the float valve 4 is installed under high temperature conditions such as in a machine room while the compressor 1 is operating, the refrigerant in the float valve 4 will gasify, and when this gas component increases, the valve will tend to close due to gas pressure. However, since the refrigerant is cooled in the suction pipe 7, the refrigerant will not be gasified. In this embodiment, heat is exchanged between the suction pipe 7 and the guide pin 4e', but this is because the guide pin 4e' is connected to the float valve 4.
Since it is arranged so as to extend inside, it becomes easier to exchange heat with the refrigerant, thereby increasing the effect of the cooling action described above. However, this method is not limited to this method. good. However, in this case, in order to efficiently cool the float valve 4, means such as wrapping the suction pipe 7 around the float outer shell 4a are required, and it is unavoidable that the manufacturing process is slightly more complicated than the above-mentioned means.

As described above, the present invention is constructed by sequentially connecting a compressor, a condenser, a dryer, a pressure reducer, and a cooler, and the cooler cools the inside of a refrigerator or the like, and the compressor is operated on and off. A float valve is provided between the outlet of the condenser and the inlet of the pressure reducer, which opens and closes depending on the increase or decrease of refrigerant, and controls the temperature inside the refrigerator.
This float valve is brought into contact with a part of the connecting pipe between the compressor and the cooler for heat exchange, thereby supercooling the float valve and suppressing evaporation of the refrigerant liquid in the float valve. The refrigerant liquid can flow toward the float valve without any hindrance, allowing the float valve to operate smoothly.

Therefore, by using the float valve, it is possible to fully bring out the desired effect of increasing the operating efficiency of the refrigeration system.

[Brief explanation of the drawing]

FIG. 1 shows a refrigeration cycle diagram of a conventional refrigeration system, and FIG. 2 shows a refrigeration cycle diagram of a refrigeration system according to an embodiment of the present invention. 4...Float valve, 7...Suction pipe (connection pipe).

Claims (1)

[Scope of utility model registration request] It consists of a compressor, a condenser, a dryer, a pressure reducer, and a cooler connected in sequence, the cooler cools the inside of a refrigerator, etc., and the temperature inside the refrigerator is controlled by ON/OFF operation of the compressor. In addition, a float valve is provided between the outlet of the condenser and the inlet of the pressure reducer, which opens and closes depending on the increase or decrease of refrigerant, and the float valve and a part of the connecting piping between the compressor and the cooler are connected in a heat exchange manner. Refrigeration equipment in contact.