JPS5899679A - 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 2.1 The present invention provides an ON-O compressor that forms part of a cooling system.
The present invention relates to an improvement of a refrigeration system that controls the temperature inside the refrigerator by controlling the FF.

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.

BACKGROUND ART Conventionally, in refrigerators employing this type of refrigeration system, the temperature inside the refrigerator is controlled by ON-OFF control of a compressor forming a part of the cooling system. 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, is The refrigerant in the condenser flows into the evaporator because the refrigerant in the condenser flows into the evaporator. At the same time,
In a high-pressure vessel type compressor such as a rotary compressor, when the operation is stopped, high-pressure, high-temperature refrigerant flows backward from the pressure control side to the low-pressure side. 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 inside the refrigerator.
The end result is an increase in electricity bills.

To solve this kind of drawback, a refrigerant control valve is provided in a part between the condenser inlet and the evaporator inlet for the inflow from the capillary tube, as disclosed in Japanese Patent Application Laid-Open No. 16066/1983. Japanese Utility Model Application Publication No. 65-96373 discloses a device in which a check valve is provided at the threshold between the evaporator outlet and the compressor suction port.

However, the solenoid valve as the refrigerant control valve requires input for its operation and a difficult control relationship.
It had a disadvantage in terms of cost.

In view of these points, the present invention provides a refrigerant control valve that does not use a solenoid valve, but utilizes the characteristics of the cooling system to move a float up and down depending on an increase or decrease in the amount of liquid refrigerant present at the condenser outlet, thereby opening and closing the valve part. 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.

In other words, the float buoyancy that operates the float valve is:
It is affected by the state of the liquid refrigerant; for example, when there is insufficient condensation, a state of gas-liquid mixture occurs, causing fluctuations in buoyancy. Therefore, it is desirable to use completely liquefied refrigerant to cool the inside of the float as much as possible, and the present invention aims to stabilize the operation of the 7 o -to valve by interposing a float valve downstream of the auxiliary condenser.

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

In the figure, reference numeral 1 denotes a refrigerator body, and a partition member 4 is provided to partition the inside of a cabinet 3 made of a heat insulating wall 2 into upper and lower parts, and the upper chamber is divided into a freezing chamber 5 and the lower chamber into a refrigerator chamber 6. Both chambers 5 and 6 have dedicated freezer compartment doors 7 and refrigerator compartment doors 8, respectively. Inside the partition member 4, an evaporator 9 forming part of a well-known cooling system and a fan 1o for sending cold air into the refrigerator are provided, including a cold air outlet 11 for the freezer compartment and a cold air outlet for the refrigerator compartment. 12 to each chamber 6.6 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 conventionally known damper thermostat, so a detailed explanation will be omitted. A thermostat 1 is installed on the upper surface of the freezer compartment 5 to detect the temperature inside the freezer compartment 6 and turn the operation of the compressor 14 ON-OFF.
It is equipped with 6. The cooling system is a rotary type compressor that generates high pressure inside a closed container14. The main condenser 16a, the auxiliary condenser 1eb, the capillary tube 17, and the evaporator 9 are connected in sequence, and a check valve 18 is provided between the outlet of the evaporator 9 and the suction port of the compressor 14. The outlet of the check valve 18 and the inlet of the check valve 18 are connected by a first suction pipe 19, and the outlet of the check valve 18 and the suction port of the compressor 14 are connected by a second suction pipe 2o. 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.

61. -... The auxiliary condenser 18b is disposed on the front opening edge 3a of the main body 1 for heat exchange, and prevents sweating on the front opening edge 3a, which has a lower temperature than the outside air, and also prevents the refrigerant condensed in the main condenser 16a. is further supercooled. 21 is a float valve body provided between the outlet of the auxiliary condenser 16b and the capillary tube 1a, and the float valve body 21 and the suction pipe 19
are in contact with each other for heat exchange and are embedded in the heat insulating wall 2 to promote supercooling of the refrigerant in the float valve body 21 and to prevent the supercooled liquid 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 Pall valve 24. Approximately half of it is made of insert foam. The above-mentioned pole valve 2 is located below the float part 22.
4, forming a valve seat 25 that is closed at the float valve outlet 2.
A refrigerant passage 25a communicating with 6 is provided. The refrigerant passage 26a has seven pages with a small diameter on the valve seat 26 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. 2
The float part 23 of the float part 22 can be made smaller by reducing the pressure loss at 6 and operating with a small opening force, that is, a slight buoyant force when the ball valve 24 is opened.

Further, the float valve outlet 26 is provided with an outlet vibe 26a whose inner diameter is approximately the same as the outer diameter of the capillary tube 17.
is inserted and fixed. In addition, for float valve population 28,
A filter 2 having a smaller diameter than the small diameter of the refrigerant passage 25a.
8a, 28b, and a desiccant 28a such as molecular sheep
is provided to adsorb moisture in the cooling system and to prevent metal scraps and the like from entering the float valve body 21.

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

Furthermore, 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 float portion 22 is constructed in a dimensional relationship that prevents excessive movement. Therefore, when liquid refrigerant exists in the float valve body 21, the float part 22 is pressed against the upper surface 21a of the float valve body by the buoyancy of the float part 23. At this time, the float valve inlet 28 - convex stop horn Z -
27 - a gap between the inner periphery of the float valve main body 21 and the outer periphery hexagonal part of the float part 23 - the float valve outlet 26, and a refrigerant flow path is formed. Conversely, when the amount of liquid refrigerant in the float valve main body 21 decreases, the buoyancy of the float section 23 decreases, and the float section 22 descends due to its own weight, and the ball valve 24 causes the valve seat 26 to
Close the circuit.

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

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

Damper 1 provided at cold air outlet 12 for refrigerator compartment in refrigerator compartment 6
3, adjust the opening of the cold air outlet 12 for the refrigerator compartment,
The amount of cold air cooled by the evaporator 9 and sent at 77% 09B into the refrigerator compartment 6 is controlled to cool the refrigerator compartment 6 to a predetermined temperature.

In addition, the thermostat 16 provided in the freezer compartment 6 allows
The temperature of the freezer compartment 6 is detected, and if the temperature is above a predetermined temperature, the compressor 14. The fan 7 is operated to control the temperature to a predetermined temperature. During cooling operation, the compressor 14. Main condenser 16a, auxiliary condenser 16b, capillary tube 17. The evaporator 9 constitutes a regular cooling system, and when the compressor 14 is operated and the refrigerant begins to condense and liquefy in the main condenser 16a and the auxiliary condenser 16b, the float valve body installed vertically Refrigerant liquid begins to accumulate inside 21.

At this time, inside the float valve body 21, the valve seat 26° ball valve 24 is sealed so that the high-pressure refrigerant compressed by the compressor 14 pushes down the float portion 22 and the refrigerant does not flow into the capillary tube 17.

When the refrigerant liquid accumulates up to the top surface of the float section 22,
The float part 22 floats due to the buoyant force of the float part 23, and the refrigerant liquid flows into the capillary tube 17. The specific gravity and volume of the float portion 23 are determined by the specific gravity of the refrigerant liquid, the high pressure inside the condenser 16, and the refrigerant passage area on the valve seat 26 side. Further, since the pressure in the second suction pipe 2o that is connected to the main suction pipe 9 becomes low, the refrigerant passage of the check valve 18 is also opened, and cooling operation is performed. When the cooling operation continues and the inside of the refrigerator main body 1 is cooled and the temperature decreases, the auxiliary condenser 16b, which is arranged to exchange heat with the front opening 3a of the main body 1,
The refrigerant inside exchanges heat with the front opening 3a, and the front opening 3a
At the same time, the temperature of the refrigerant in the auxiliary condenser 16b is lowered to promote supercooling, and the flow cools the float valve body 21, further supercooling the refrigerant in the float valve body 21.

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 f'14, and will not be used under high outside temperature or overload conditions. It is possible to stably maintain supercooling even when the temperature is low, and efficient cooling operation can be performed.

Here, when the compressor 14 is stopped by the thermostat 16, the liquefied refrigerant accumulated inside the condenser 16 and the float valve body 21 is removed from the float part 2 inside the float valve body 21.
3 When the refrigerant flows through the capillary tube 17 to a position slightly lower than the upper surface, the buoyancy decreases compared to the refrigerant gas pressure, the valve seat 25 is sealed by the ball valve 24, and the refrigerant flows from the capillary tube 17 into the evaporator 9. will no longer flow in.

At the same time, the high- and low-pressure airtightness created by the oil in the compressor 14 is broken, and the high-pressure, high-temperature refrigerant inside the compressor 14 flows back into the second suction pipe 2o.

As a result, the first suction pipe 19 has a lower pressure than the second suction pipe 2o, so that the refrigerant passage of the check valve 18 is closed.

Note that since the float valve inlet 28 is provided with filters 28a, 28b whose diameter is smaller than the diameter of the refrigerant passage 25a and a drying material 280, the inside of the float valve main body 21 is
and 4) metal scraps etc. do not enter into the refrigerant passage 26a and the refrigerant passage 26a is not closed. Furthermore, since the diameter of the refrigerant passage 25a on the valve seat 26 side is smaller than the inner diameter of the capillary tube 17 and the length is very short, there is little pressure loss at the valve seat 26, and the valve adsorption when the ball valve 24 is opened is reduced. The force, that is, the product of the valve seat area and the pressure difference before and after the pole valve can be reduced, and the float part 23 of the float part 22 can be made smaller.

Furthermore, since the diagonal lengths of the inner periphery of the float valve main body 21 and the hexagonal portion of the float portion 23 are approximately the same, rattling of the float portion 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 system 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 cheep. In addition to cooling the inside of the refrigerator, the temperature inside the refrigerator is controlled by ON-OFF operation as described in page 13 of the compressor, and the auxiliary condenser is disposed on the front opening edge of the refrigerator body for heat exchange, and the auxiliary condenser is Since a flow valve is installed on the downstream side of the container that opens and closes depending on the increase or decrease of the liquid refrigerant inside, the refrigerant that creates buoyancy in the float part of the float valve body that controls the refrigerant flow is overflowed by an auxiliary condenser. It is possible to operate with a liquid refrigerant that has been cooled, that is, completely liquefied, and it is possible to reduce the unstable state of the refrigerant in the float valve, that is, the gas-liquid mixed state, and to perform stable control.

Furthermore, heat exchange between the float valve body and suction tube,
Alternatively, by embedding the float valve body in a heat insulating material, vaporization within the float valve body can be reduced, more stable operation can be achieved, and a refrigeration system with low running costs can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a refrigerator to which an embodiment of the device of the present invention is applied, and FIG. 2 is a sectional view of essential parts taken along line nu' in FIG. 1.
FIG. 3 is a cooling system piping diagram, FIG. 4 is a sectional view of the float valve body, and FIG. 6 is an exploded perspective view of the main parts of FIG. 4. 14...Compressor, 16a...Main condenser, 1eb...Auxiliary condenser, 17...Capillary tube, 18-...e Back check Valve, 19.20
・－・・・・First. Second suction nove, 21
...Float valve body. Name of agent: Patent attorney Toshio Nakao and 1 other person11
Figure 112 Figure 19 1320 Figure 4

Claims (3)

[Claims] (1) A cooling system consisting of a compressor, a main condenser, an auxiliary condenser, a capillary tube, an evaporator, and a suction tube are connected in sequence to cool the inside of the refrigerator, which is insulated with a heat insulating material, and to The temperature inside the refrigerator is controlled by 0N-OFF operation, and there is a
A refrigeration system in which the auxiliary condenser is disposed for heat exchange, and further includes a float valve body downstream of the auxiliary condenser that opens and closes depending on the increase or decrease of liquid refrigerant present inside the auxiliary condenser. (2) The refrigeration apparatus according to claim 11, wherein the float valve body and the suction tube are arranged for heat exchange. (3) The refrigeration system according to claim 1 or 2, wherein the float valve main body is embedded in the heat insulating material.