JPS6363832B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a compressor that forms part of a cooling system.
This invention relates to an improvement in a refrigeration system that controls the temperature inside the refrigerator through ON-OFF control.

There are two types of compressors: low-pressure container type compressors such as reciprocating type compressors, and high-pressure container type compressors such as rotary type compressors. A refrigeration system having a refrigerator will be explained.

Traditionally, refrigerators that use this type of refrigeration system have a compressor that is part of the cooling system.
The temperature inside the refrigerator is controlled by ON-OFF control. As is well known, at the moment the compressor stops, a large amount of high-temperature, high-pressure refrigerant accumulates in the condenser and compressor, and at the same time as the compressor stops, the capillary tube, which is the pressure reducing device of the cooling system, Because it has the function of a pressure equalizing pipe that balances high and low pressures, rather than its original pressure reducing function, the high temperature and high pressure refrigerant in the condenser flows into the evaporator. At the same time, in a high-pressure vessel type compressor such as a rotary compressor, the high-pressure high-temperature refrigerant flows back from the high-pressure side to the low-pressure side due to the shutdown. Therefore, this high-pressure high-temperature refrigerant flows back from the compressor suction port to the evaporator outlet and flows into the evaporator.

Naturally, the flow of such high-pressure, high-temperature refrigerant into the evaporator directly increases the heat load within the refrigerator, which ultimately results in an increase in electricity bills.
To address this type of drawback, a refrigerant control valve was provided in a part between the condenser inlet and the evaporator inlet for inflow from the capillary tube in Japanese Patent Laid-Open No. 56-16066.
It is shown in the Japanese Utility Model Publication No. 55-96373,
It is known to provide a check valve between the evaporator outlet and the compressor suction port.

However, the electromagnetic valve as the refrigerant control valve requires an input for its operation and a difficult control relationship, and has a disadvantage in terms of cost.

In view of this, the present invention uses a float valve that takes advantage of the characteristics of the cooling system and opens and closes the valve portion by moving the float up and down depending on the amount of liquid refrigerant present at the condenser outlet, instead of using a solenoid valve as the refrigerant control valve. By providing the float valve, the effect is exactly the same as that of a solenoid valve, and since no electrical input is required, it is possible to further save power, and furthermore, the operation of the float valve is stabilized.

That is, the float buoyancy for operating the float valve is affected by the state of the liquid refrigerant. For example, when there is insufficient condensation, a state of gas-liquid mixing occurs, causing fluctuations in the buoyancy. Therefore, it is desirable to use completely liquefied refrigerant to cool the inside of the float, and in the present invention, a float valve is interposed downstream of the auxiliary condenser to stabilize the operation of the float valve.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is the refrigerator body, and the insulation wall 2
A partition member 4 is provided to partition the inside of the cabinet 3 into upper and lower sections, and the upper chamber is divided into a freezing chamber 5 and the lower chamber into a refrigerating chamber 6. Both chambers 5 and 6 have dedicated freezer compartment doors 7 and refrigerator compartment doors 8, respectively. The interior of the partition member 4 is equipped with an evaporator 9, which is part of a well-known cooling system, and a fan 10 that sends cold air into the refrigerator. Cold air is sent to each chamber 5, 6 to cool the inside of the warehouse. The cold air outlet 12 for the refrigerator compartment is equipped with a damper 13 that detects the temperature inside the refrigerator compartment 6 and adjusts the opening area of the cold air outlet 12 for the refrigerator compartment. This damper 13 may be a conventional damper thermostat, so a detailed explanation will be omitted. The temperature inside the freezer compartment 5 is detected on the top surface of the freezer compartment 5, and the compressor 14
It is equipped with a thermostat 15 that turns the operation ON and OFF. The cooling system includes a rotary compressor 14 and a main condenser 16 that create high pressure inside the closed container.
a, auxiliary condenser 16b, capillary tube 1
7. The evaporators 9 are connected in sequence, and a check valve 18 is installed between the outlet of the evaporator 9 and the suction port of the compressor 14.
A first suction pipe 19 connects the outlet of the evaporator 9 and an inlet of the check valve 18, and a second suction pipe 20 connects the outlet of the check valve 18 and the suction port of the compressor 14. are doing. A part of the first suction pipe 19 on the side of the evaporator 9 is arranged in the partition member 4, and the other part is buried in the heat insulating wall 2.

The auxiliary condenser 16b is located at the front opening edge 3a of the main body 1.
The main condenser 16
The refrigerant condensed in step a is further supercooled. 21 is the outlet of the auxiliary condenser 16b and the capillary tube 1
7, the float valve body 21 and the suction pipe 19 are brought into contact with each other for heat exchange, and the float valve body 21 is buried in the heat insulating wall 2 to prevent supercooling of the refrigerant in the float valve body 21. At the same time, the supercooled liquid is prevented from being gasified by heating from the outside air.

A float part 22 is housed inside the float valve main body 21, and the float part 22 consists of a float part 23 made of a foaming material such as chloroprene or nitrile rubber, and a ball valve 24. Approximately half of it is made of insert foam. A refrigerant passage 25a is provided below the float portion 22, forming a valve seat 25 that is closed by the ball valve 24, and communicating with the float valve outlet 26. The refrigerant passage 25a has a small diameter on the valve seat 25 side and a large diameter on the outlet 26 side.The small diameter is smaller than the inner diameter of the capillary tube 17, and the length is very short. The pressure loss is small and
When the ball valve 24 is opened, it operates with a small opening force, that is, a slight buoyant force, so that the float part 23 of the hollow float part 22 can be made smaller. Further, an outlet pipe 26a having an inner diameter substantially the same as the outer diameter of the capillary tube 17 is inserted and fixed into the float valve outlet 26. Further, the float valve inlet 28 is provided with filters 28a and 28b whose diameter is smaller than the small diameter of the refrigerant passage 25a, and a desiccant 28c such as a molecular sieve, which adsorbs moisture in the cooling system and prevents the float valve body 21 from drying. This prevents metal scraps etc. from entering inside.

Further, the float valve main body 21 is formed in a cylindrical shape, while the outer periphery of the float portion 23 is formed in a substantially hexagonal shape,
Its diagonal length is made slightly smaller than the inner diameter of the float valve main body 21.

Further, a plurality of convex stoppers 27, 27, etc. are integrally formed on the outer edge of the upper surface of the float portion 23, and contact the upper surface 21a of the float valve main body forming the float valve inlet 28, so that the excessive Constructed in dimensional relationships that prevent movement. Therefore, when liquid refrigerant exists in the float valve body 21, the buoyancy of the float part 23 causes the float part 22 to
is pressed against the upper surface 21a of the float valve body. At this time, float valve inlet 28 → convex stopper 2
Passage between 7 → inner circumference of float valve body 21 and float part 2
A refrigerant flow path is formed between the gap with the outer peripheral hexagonal part of No. 3 and the float valve outlet 26. Conversely, when the amount of liquid refrigerant in the float valve body 21 decreases, the buoyancy of the float section 23 decreases, and the float section 22 descends due to its own weight, causing the ball valve 24 to close the valve seat 25.

Further, the float valve inlet 28 is connected to the auxiliary condenser 16b outlet, and the float valve outlet pipe 26a is connected to the capillary tube 17 inlet.

Next, the operation of the above configuration will be explained.

The opening of the cold air outlet 12 for the refrigerator compartment is adjusted by the damper 13 provided at the cold air outlet 12 for the refrigerator compartment in the refrigerator compartment 6, and the air is cooled by the evaporator 9, and the fan 1
The amount of cold air sent into the refrigerator compartment 6 is controlled to cool the refrigerator compartment 6 to a predetermined temperature.

In addition, a thermostat 15 provided in the freezer compartment 5
The temperature of the freezer compartment 5 is detected, and if the temperature is higher than a predetermined temperature, the compressor 14 and fan 7 are operated to control the temperature to a predetermined temperature. During cooling operation, the compressor 14, main condenser 16a, auxiliary condenser 16b, capillary tube 17, and evaporator 9 constitute a regular cooling system. 16a, when the refrigerant liquid begins to condense and liquefy in the auxiliary condenser 16b, the refrigerant liquid begins to accumulate inside the vertically mounted float valve body 21. At this time, inside the float valve body 21, the valve seat 2
5. The ball valve 24 is sealed so that the high-pressure refrigerant compressed by the compressor 14 pushes down the float portion 22 and prevents the refrigerant from flowing into the capillary tube 17. When the refrigerant liquid accumulates on the upper surface of the float section 22, the float section 22 floats up due to the buoyant force of the float section 23, and the refrigerant liquid flows into the capillary tube 17. The specific gravity and volume of the float portion 23 are determined based on the specific gravity of the refrigerant liquid, the high pressure inside the condenser 16, and the refrigerant passage area on the valve seat 25 side. Further, since the pressure in the second suction pipe 20 is lowered by the first suction pipe 9, the refrigerant passage of the check valve 18 is also started, and a cooling operation is performed. When the cooling operation continues and the inside of the refrigerator body 1 is cooled and the temperature decreases, the auxiliary condenser 1, which is disposed for heat exchange with the front opening 3a of the body 1,
The refrigerant in 6b exchanges heat with the front opening 3a, increases the temperature of the front opening 3a, lowers the temperature of the refrigerant in the auxiliary condenser 16b, promotes supercooling, and stabilizes the refrigerant in the float valve body 21. to allow supercooled liquid to flow in. Furthermore, the float valve body 21 is cooled by the refrigerant gas flowing in the suction tube 19, and the refrigerant in the float valve body 21 is further supercooled.

In addition, since the float valve main body 21 is buried in the heat insulating material 2, the refrigerant once supercooled will not be gasified due to the thermal influence of the compressor 14, even under high outside temperature or overload conditions. It is possible to stably maintain supercooling, and efficient cooling operation is performed.

Here, the compressor 14 is controlled by the thermostat 15.
When it stops, the condenser 16 and the float valve body 2
When the liquefied refrigerant accumulated inside the float valve body 21 flows through the capillary reach tube 17 to a position slightly lower than the upper surface of the float part 23, its buoyancy decreases compared to the refrigerant gas pressure. The valve seat 25 is sealed by the ball valve 24, and refrigerant no longer flows from the capillary tube 17 into the evaporator 9.

At the same time, the oil inside the compressor 14 causes a high
The low-pressure hermeticity is broken, and the high-pressure, high-temperature refrigerant inside the compressor 14 flows back into the second suction pipe 20.

As a result, the first suction pipe 19 has a lower pressure than the second suction pipe 20, so
The refrigerant passage of the check valve 18 is closed.

In addition, since filters 28a, 28b and desiccant material 28c, which are smaller in diameter than the refrigerant passage 25a, are provided at the float valve inlet 28, metal scraps etc. do not enter into the float valve main body 21, and the refrigerant passage 25
a is never closed. Furthermore, since the diameter of the refrigerant passage 25a on the valve seat 25 side is smaller than the inner diameter of the capillary tube 17 and the length is very short, the pressure loss at the valve seat 25 is small, and the ball valve 24
The valve suction force when opening the ball valve, that is, the product of the valve seat area and the pressure difference before and after the ball valve, can be reduced.
The second float portion 23 can be downsized.

In addition, the inner periphery of the float valve main body 21 and the float portion 23
Since the diagonal lengths of the hexagonal parts are substantially the same, wobbling of the float part 22 and poor sealing do not occur. Furthermore, since the float portion 23 is made of a foamed material such as chloroprene or nitrile rubber, a refrigerant such as fluorocarbon gas does not have a swelling effect.

As is clear from the above description, the refrigeration apparatus according to the present invention uses a cooling system configured by sequentially connecting a compressor, a main condenser, an auxiliary condenser, a capillary tube, and an evaporator suction tube. cooling the inside of the refrigerator, and controlling the temperature inside the refrigerator by ON/OFF operation of the compressor;
In addition, the auxiliary condenser is disposed on the front opening edge of the refrigerator body for heat exchange, and a flow valve is provided downstream of the auxiliary condenser that opens and closes depending on the increase or decrease of the liquid refrigerant present inside. It is possible to operate with liquid refrigerant that has been supercooled, that is, completely liquefied, using an auxiliary condenser to create buoyancy in the float part within the float valve body that controls the flow of refrigerant. This allows stable control to be achieved by reducing the number of gas-liquid mixing states.

Furthermore, by exchanging heat between the float valve body and the suction tube, or by embedding the float valve body in heat insulating material, vaporization within the float valve body is reduced, resulting in more stable operation, resulting in a refrigeration system with low running costs. You can get

[Brief explanation of drawings]

Fig. 1 is a sectional view of a refrigerator to which an embodiment of the present invention is applied, Fig. 2 is a sectional view of main parts taken along line -' in Fig. 1, Fig. 3 is a cooling system piping diagram, and Fig. 4 is a float A sectional view of the valve body, and FIG. 5 shows an exploded perspective view of the main parts of FIG. 4. 14...Compressor, 16a...Main condenser, 16b
...Auxiliary condenser, 17...Capillary tube,
18... Check valve, 19, 20... First and second suction pipes, 21... Float valve main body.

Claims (1)

[Claims] 1. A cooling system configured by sequentially connecting a compressor, a main condenser, an auxiliary condenser, a capillary tube, an evaporator, and a suction tube to cool the inside of the refrigerator, which is insulated with a heat insulating material. At the same time, the temperature inside the refrigerator is controlled by ON/OFF operation of the compressor, and the auxiliary condenser is disposed on the front opening edge of the main body for heat exchange, and furthermore, on the downstream side of the auxiliary condenser, the internal temperature is controlled. A refrigeration system equipped with a float valve body that opens and closes depending on the increase or decrease of liquid refrigerant present in the refrigerator. 2. The refrigeration system according to claim 1, wherein the float valve body and the suction tube are arranged for heat exchange. 3. Claim 1 or 2, wherein the float valve body is embedded in the heat insulating material.
Refrigeration equipment as described in section.