JPS58214754A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigeration system that is used in refrigerators, showcases, etc., and uses a float valve to open and close a refrigerant circuit. The purpose is to

In this type of conventional refrigeration system, a high concentration, high pressure refrigerant compressed by a compressor 1 is liquefied in a condenser 2, and then liquefied in a dryer 3. It passes through a float valve 4', is depressurized by a capillary tube 6, is evaporated at a predetermined temperature in an evaporator 6, and returns to the compressor 1, repeating the refrigeration cycle. This float valve 4'
is composed of a float valve outer shell 4a/+7o-t 4b', a valve part 4C', a valve seat part 4d', and a valve hole 4e/, and is cooled by a condenser 2 while the compressor 1 is in operation. The liquid refrigerant accumulates, and when the liquid level reaches a predetermined level, the flow +, 4b/ floats due to buoyancy, operates the valve section 4C' in the opening direction, opens the refrigerant circuit, and sends the liquid refrigerant to the capillary tube 6, normally It has a cooling effect. However, when the compressor 1 is stopped, no liquid refrigerant flows into the valve shell 4a', so the liquid level drops, and the float 4b' also lowers, operating in the direction of closing the valve portion 4C/, thereby closing the refrigerant circuit. For this reason, the high-pressure two-phase refrigerant (mainly gas) does not flow to the evaporator θ side when the cooling operation is stopped, so that the refrigerant gas, which has no refrigerating effect, evaporates due to back pressure while the compressor 1 is stopped. This prevents the temperature of the evaporator 6 from rising due to the flow to the evaporator 6 side, thereby increasing the operating efficiency of the refrigeration system.

Generally, for valve parts such as float valves or solenoid valves,
A small amount of leakage when the valve is closed is often allowed in consideration of production yield.

Particularly with respect to a float valve, if the valve hole is completely sealed when the valve is closed, a situation occurs in which the refrigerant is not fully supplied with heat, and the float valve therefore loses its opening/closing 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, under certain pressure conditions, such as high pressure or low pressure, the valve hole may be close to being completely leaked. In some cases, it may be sealed,
This has the disadvantage that the float valve no longer functions.

The present invention eliminates the drawbacks of the conventional example described above, and the configuration of one embodiment of the present invention will be explained below with reference to FIG. 2. Components in the figure that are the same as those in FIG. 1 of the conventional example are designated by the same numbers and explanations are omitted, and only the different parts will be explained.

The high temperature and high pressure refrigerant is compressed by the compressor 1.

It is liquefied in a condenser 2, and then sent to a dryer 3. It passes through the float valve 4, is depressurized in the capillary tube 6, is evaporated at a predetermined temperature in the evaporator 6, passes through the suction pipe 7, passes through the suction pipe section 4f provided in the float valve 4, and is then pumped into the compressor 1. It constitutes the refrigerant circuit that returns to the The float valve 4 includes a float valve outer shell 4a, a float 4b, and a valve portion 40 integrated with the float. It consists of a valve seat portion 4d, a valve hole 4B, and a suction pipe portion 4f. and,
The suction pipe portion 4f is provided to pass through the float valve outer shell 4N from the inlet 4h side to the outlet 41 side, and is provided with a fine hole 4g corresponding to the position of the gas reservoir in the float valve outer shell. The large resistance is determined to be greater than the resistance of the valve hole 4e and so as not to interfere with the intended function of the float valve.

In such a configuration, when the compressor 1 is operating, the liquid refrigerant cooled by the condenser 2 accumulates, and the float 4b
The fine hole 4 of the suction pipe section 4f is
An auxiliary refrigerant circuit is constructed from g to the compressor 1, and the gas that has no refrigerating effect bypasses the cooler 6 and is directly returned to the compressor 1. By removing this gas, the liquid to the float valve 4 is Smooth inflow of refrigerant. On the other hand, when a predetermined amount of liquid refrigerant accumulates in the float valve 4, the float 4b floats, and the valve part 4C is moved in the opening direction, the difference in resistance between the fine hole 4g and the valve hole 4e causes the difference between the valve hole 46 and the capillary tube. 5. The suction pipe section 4f forms a main refrigerant circuit called the evaporator 6 and performs the normal cooling cycle described in the conventional example.
Since this is provided in the float valve 4, the relatively cold return/regas from the evaporator 6 can supercool the liquid refrigerant in the float valve 4, thereby enhancing the refrigeration effect. When the compressor 1 is stopped, no liquid refrigerant is supplied to the float valve 4, the liquid level drops, the float 4b also drops, and the valve moves in the closing direction.

At this time, an auxiliary refrigerant circuit is configured through the fine holes 4g and to the compressor 1, and a small amount of gas that does not interfere with the intended function of the float valve is passed through the suction pipe section 4f to the compressor 1. Similarly, the flow bypasses the cooler 6 to ensure float operation in the next cycle.

As described above, the present invention sequentially connects a compressor, a condenser, a capillary tube, an evaporator, etc. in an annular manner, controls the temperature inside the refrigerator by ON-OFF operation of the compressor, and connects the outlet of the condenser and the capillary. Kid between tube inlet
, a float valve is provided that opens and closes depending on the increase and decrease of circulating refrigerant due to operation and stop of the compressor, and the float valve has a fine hole connected to the suction side of the compressor and the outlet side of the evaporator and facing into the float valve. Since the suction pipe is installed internally, the function of the float valve can be maintained without any problems even under the various operating conditions of the refrigeration equipment, which greatly contributes to reducing the power cost of the refrigeration equipment. I can do things. In addition, due to the function of the suction pipe, the float valve can be opened and closed reliably and quickly, and the liquid refrigerant inside the float valve can also be supercooled.

[Brief explanation of drawings]

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. 1... Compressor, 2... Condenser, 4...
...Float valve, 4f...Suction pipe section, 6.
... Capillary tube, 6 ... Evaporator.

Claims (1)

[Claims] A compressor, a condenser, a capillary tube, an evaporator, etc. are sequentially connected in an annular manner, and the temperature inside the refrigerator is controlled by ON-OFF operation of the compressor, and between the outlet of the condenser and the inlet of the capillary tube, , a float valve is provided that opens and closes depending on the increase or decrease of circulating refrigerant when the compressor is started or stopped, and this float valve is connected to the suction side of the compressor and the outlet side of the evaporator, and has a fine hole facing into the float valve. Refrigeration equipment with an internal suction pipe section.