JPH0626740A - Freezing and cold storage system - Google Patents

Abstract

PURPOSE:To provide a low-cost freezing and cold storage system which performs high-stable operation in a wide working temperature range by providing a volatile liquid-sealed bellows operation type fluid control valve between the condenser and the expansion device of the freezing and cold storage system for a freezer refrigerator. CONSTITUTION:A refrigerant passing from a compressor 12 through a condenser 14 flows through an inlet 5 to a housing 1 of a bellows operation type flow rate control valve 20 and is exerted on a bellows 2 sealed with volatile liquid. The bellows is expanded and contracted in relation between the pressure of a refrigerant and the saturated pressure of volatile liquid in the bellows 2 and a valve element 3 is relatively displaced to a valve seat 4. The refrigerant flows through a valve hole, formed in the valve seat 4, to an outlet 6 in a flow rate responding to displacement of the valve element 3 and flows in an expansion device 18, the refrigerant flowing therefrom to a vaporizer 16 for vaporization. The bellows 2 is sealed with the volatile liquid so that saturated steam pressure is increased, within a steady state operation temperature range, to a value higher than the saturated pressure of the refrigerant and reduced, outside the steady state working temperature range, to a value lower than the saturated steam pressure of the refrigerant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating / refrigerating system having a compressor for a refrigerator / freezer, a condenser expanding device and a vaporizer.

[0002]

2. Description of the Related Art Since a domestic refrigerator / freezer is required to have low cost and high reliability, it is desirable to reduce the number of parts and to simplify its structure. Refrigerators and refrigerators for general household use motor driven compressors, condensers, evaporators,
A gas compression refrigeration cycle equipped with a liquid receiver, a refrigerant flow restrictor, etc. is provided. Most refrigerant flow restrictors use capillaries because of their low cost and high reliability.

To explain the operation of the above-mentioned general refrigerating and refrigerating system, the refrigerant gas whose pressure has been increased by the compressor is passed through the condenser to be liquefied, and then passed through the capillary tube in the flow restrictor as a saturated or supercooled liquid. It is greatly decompressed and flows into the evaporator to be vaporized. At this time, the refrigerant absorbs heat around the evaporator and vaporizes into a low-pressure gas, which is returned to the compressor and circulated. By performing this heat absorption in the refrigerating compartment, the temperature in the refrigerating compartment can be lowered.

[0004]

The above refrigerating and refrigerating system is very inefficient unless it is operated under optimum conditions. For example, when the heat load is small, the heat in the refrigerating compartment is insufficient to vaporize the refrigerant in the evaporator, so the refrigerant is filled in the liquefied state. A significant portion of the circulating refrigerant is retained in the evaporator in a liquefied state, reducing the volume of refrigerant that is effectively working in the refrigeration system. As a result, the uncondensed gaseous refrigerant and the unheated liquid refrigerant flow into the evaporator through the capillaries and reach the compressor. As a result, the compressor is overloaded and the system efficiency drops sharply. Further, the efficiency is lowered even when the heat load in the refrigerating compartment is large and the temperature of the atmosphere is high. In this case, the amount of heat radiated by the refrigerant passing through the condenser is not sufficient, and the liquefaction of the refrigerant becomes incomplete. As a result, both the gaseous refrigerant and the liquid refrigerant coexist in the system and circulate, and the compressor is overloaded. This reduces system efficiency. It is preferred to remove the gaseous portion from the refrigerant flowing into the evaporator to improve efficiency. However, limiting the flow of refrigerant from the condenser to the evaporator when the temperature is very high is not desirable for the operating efficiency of the refrigeration system. This is because there is a risk that the compressor will be damaged if a restrictor that restricts the flow from the condenser to the evaporator is provided to increase the flow path resistance.

Since a domestic refrigerator / freezer operates in a fairly wide operating range, the operation of the compressor is controlled by a temperature controller provided in the refrigerating compartment. That is, when the temperature reaches a predetermined temperature, the operation of the compressor is stopped, and the refrigerant in the condenser is allowed to flow into the evaporator through the capillaries at a low flow rate to ensure the vaporization of the refrigerant even at a low temperature. This makes it possible to make the pressure in the refrigeration system uniform, eliminate the coexistence of the gaseous refrigerant and the liquid refrigerant, and prevent the compressor from being overloaded. However, when the temperature controller restarts the compressor, it takes time for the refrigerant to be compressed, condensed, and vaporized. Therefore, the ratio of the time until the pressure in the refrigerating / refrigerating system is made uniform to the time until the refrigeration is restarted is set to a predetermined value to optimize the operation of the refrigerator / freezer. To set this ratio, the size or inner diameter of the capillaries within the flow restrictor is selected. A home-use refrigerator-freezer uses a capillary tube having a relatively large diameter. For this reason, the amount of refrigerant passing through the capillaries is large, the pressure in the system is equalized quickly, and the refrigerant quickly flows into the evaporator immediately after the compressor is started, and the system starts up quickly and easily in a steady state. It has the advantage of becoming Further, since the capillary tube is thick, the flow path resistance can be lowered, so that the restart torque can be small, and therefore, there is an advantage that a low torque motor can be used. However,
In steady state operation, there is also a drawback that the refrigerant is more likely to pass through the capillaries as a gas and flow into the evaporator, which lowers the system efficiency.

On the other hand, in the case of a household refrigerator using a thin capillary tube, from the above description, the advantage is that the operation in the steady state is efficient, but since the flow path resistance becomes high, the system pressure becomes uniform. It takes a long time to reach a steady state after the compressor starts up. Therefore, it is not suitable for a home refrigerator / freezer in which the above-mentioned on / off control is repeated. Further, there is a drawback that it is necessary to use a high torque motor because the flow path resistance is high. In a freezing / refrigerating system for a large refrigerator / freezer, an expansion valve is used instead of a capillary tube, and the expansion valve is appropriately controlled. That is, the surface temperature of the pipe at the outlet of the condenser, that is, the temperature of the refrigerant is detected to determine the supercooled state of the refrigerant, and the opening degree of the expansion valve is controlled. Such refrigeration systems are expensive and are not suitable for home refrigerators and freezers.

A refrigerating system has also been proposed which is provided with a solenoid-operated on-off valve that operates in response to the start and stop of the compressor and that increases or decreases the flow path resistance with respect to the refrigerant in steps. However, such a step-like change in flow resistance alone is not suitable for controlling the flow of the refrigerant in the refrigerating and refrigerating system. Further, the use of these electrically operated valves requires the provision of a control circuit or the like, which has the disadvantage of making the refrigeration system expensive. The present invention has been devised to solve the above problems for conventional home refrigerator-freezer, therefore the purpose of the present invention is to interrupt the flow of refrigerant from the condenser when the compressor is stopped, Moreover, it is an object of the present invention to provide an inexpensive refrigerating and refrigerating system for a domestic refrigerator / freezer, which ensures a flow of the refrigerant even in a high ambient temperature state.

[0008]

[Means for solving the problem] In order to achieve the above purpose,
According to the present invention, the refrigerant compressed by the compressor is condensed and liquefied by the condenser, and then is made to flow into the evaporator through the expansion device and vaporized by adiabatic expansion, thereby releasing heat to the atmosphere and freezing. A refrigerating and refrigerating system for cooling a refrigerator is provided with a fluid-filled bellows operation type flow control valve provided between the condenser and the expansion device. According to one aspect of the present invention, the fluid sealed in the bellows of the fluid-filled bellows operation type flow control valve is a volatile liquid, and by sealing this liquid, the internal pressure is saturated vapor pressure v. s. It changes depending on the temperature characteristics and expands and contracts the bellows, thereby displacing the valve element relative to the valve seat and adjusting the opening degree of the valve. Preferably, R-500 used in an air conditioner or the like is used as the enclosed liquid.

[0009]

The effective saturated vapor pressure of the liquid enclosed in the bellows is determined by the elastic force of the bellows and the ambient temperature.
The amount of the enclosed liquid in the bellows is set so that this effective saturated vapor pressure becomes lower than the saturated vapor pressure of the refrigerant in the refrigeration system above and below the steady state temperature range. Therefore, outside the steady-state temperature range, the bellows contract due to the saturated vapor pressure of the refrigerant to lift the valve element from the valve seat and allow the refrigerant to flow into the evaporator. In the steady state temperature range,
The effective saturated vapor pressure becomes higher than the saturated vapor pressure of the refrigerant,
If the compressor is not operating, the bellows seat the valve element on the valve seat and stop the flow of refrigerant. Thus, if the compressor is operating, the saturated vapor pressure is raised and the bellows contracts to lift the valve element from the valve seat. Since this lift amount depends on the pressure and temperature of the refrigerant, the amount of refrigerant flowing into the evaporator is appropriately adjusted. Therefore, even if a large-diameter capillary tube is used for the expansion device, even if the intermittent operation of the evaporator is performed in a steady state, it is possible to significantly reduce the possibility that the gaseous refrigerant will flow into the evaporator. When the ambient temperature is very high or very low, a large amount of refrigerant can be made to flow into the evaporator, so that the refrigerant pressure in the system can be made uniform, so that stable operation of the refrigeration system can be expected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a schematic diagram showing a gas compression type freezing / refrigerating system 10 used in a home refrigerator / freezer. The freezing / refrigerating system 10 is a circuit in which a refrigerant such as R-16 is sealed, and the compressor 12 compresses the refrigerant and circulates the sending circuit. The refrigerant from the compressor 12 releases heat to the outside in the condenser 1 and is liquefied, and the expansion device 1
It flows into the evaporator 16 via 8 and is adiabatically expanded and vaporized. As the expansion device 18, a capillary tube having a relatively large diameter is used, and the refrigerant is squeezed by the capillary tube and the post-evaporator 1 is used.
It flows into 6 and expands rapidly and vaporizes. As a result of the vaporization of the refrigerant,
The refrigerant absorbs heat in the freezer and returns to the compressor 12,
Then, it is compressed again, and the heat absorbed by the evaporator 16 is discharged to the outside in the condenser 14 to be liquefied. By repeating this household, the heat in the freezer-refrigerator is absorbed and released by the refrigerant, and the temperature in the refrigerator is lowered. The temperature inside the refrigerator-freezer is maintained at a predetermined temperature by intermittently operating the compressor 12 by a temperature controller (not shown) provided inside the refrigerator-freezer. In the above refrigerating and refrigerating system, in the present invention, the volatile liquid-filled bellows operation type flow control valve 20 of the condenser 14 and the expansion device 18 is provided to ensure the operation of the refrigerating and refrigerating system 10 and improve the operation efficiency. ing.

FIG. 2 shows a schematic structure of the volatile fluid-filled bellows operation type flow control valve 20. The upper end of a metal bellows 2 having elasticity is fixed to the upper wall of the valve housing 1. The lower end of the bellows 2 carries a conical valve element 3, and the tip of the valve element 3 projects into the valve hole in the center of the valve seat 4. The medium from the condenser 14 flows into the housing 1 from the inlet 5, passes through the valve hole of the valve seat 4, and flows into the expansion device 18 from the outlet 6. The bellows 2 expands and contracts according to the pressure and temperature of the medium, the valve element 3 moves up and down, and the lift with respect to the valve seat 4 is changed. Thereby, the flow rate of the refrigerant to the expansion device 18 is controlled. In the bellows 2, volatile liquid,
Preferably, R-500 is encapsulated.

Saturated vapor pressure of R-500 v. s. The temperature characteristic is shown by the curve A in the graph of FIG. 4, and the saturated vapor pressure v. s. The temperature characteristic is shown by the curve C in the figure. Since the refrigerant R-500 is enclosed in the elastic metal bellows 2, the characteristics shown by the curve B can be given by appropriately adjusting the elastic force and the refrigerant enclosure amount. That is, the saturated vapor pressure given by the curve B is set higher than the saturated vapor pressure of the refrigerant in the steady-state temperature range of the refrigerator-freezer from 10 ° C to 40 ° C. The curves A and B are broken at a temperature of around 40 ° C. because the enclosed liquid superheats at a temperature around that temperature.

The operation of the volatile liquid-filled bellows operation type flow control valve 20 having the above construction will be described. In the above steady-state temperature range (about 10 to 43 ° C.), the saturated vapor pressure of the liquid enclosed in the bellows 2 becomes higher than the saturated vapor pressure of the refrigerant, so that the bellows 2 expands, the valve element 3 descends, and the valve seat 3 rises. Sit in 4. However, when the compressor 12 is operating, the refrigerant pressure rises, so the bellows 2 contracts and lifts the valve element 3 from the valve seat 4. The refrigerant flows into the expansion device 18 at a flow rate commensurate with this lift amount. Since the lift amount in this case is set small, the flow rate of the refrigerant is small.
When the operation of the compressor 12 is interrupted, the pressure of the refrigerant drops to its saturated vapor pressure, so that the bellows 2 expands, the valve element 3 is seated on the valve seat 4, and the valve hole is closed. As described above, in the steady-state operation, the flow rate of the refrigerant is considerably limited, and the pressure on the upstream side of the flow rate control valve 20 is kept relatively high, so that the gaseous refrigerant can be prevented from flowing into the expansion device 18.

When a large load is applied to the refrigerating / refrigerating system such as by pouring a large amount of food or the like into the freezer / refrigerator, the temperature of the refrigerant becomes the upper limit of the steady state range (43 ° C. in this embodiment).
As a result, the saturated vapor pressure inside the bellows 2 becomes lower than the saturated vapor pressure of the refrigerant, so the bellows 2 contracts and the valve element 3 of the valve seat lifts greatly. For this reason, a large amount of the refrigerant flows into the evaporator through the expansion device, so that the evaporation of the refrigerant is promoted, whereby the inside of the refrigerator-freezer is quickly cooled. Further, in a relatively low temperature state where the surroundings of the refrigerator / freezer are lower than the lower limit of the steady state temperature range (10 ° C. in this embodiment), similarly, the saturated vapor pressure in the bellows 3 becomes lower than the saturated vapor pressure of the refrigerant. Therefore, the valve element 3 lifts and the refrigerant flows to the expansion device 18. In such a state, the refrigerant temperature does not rise even if the compressor 12 operates,
If the valve element 3 is seated on the valve seat 4 and the valve hole is kept closed, the refrigerant accumulates in the condenser 14, and the flow of the lubricant mixed in the refrigerant also deteriorates. It becomes insufficient and the compressor 12 is likely to be damaged. However, since the saturated vapor pressure of the volatile filled liquid in the bellows 3 has the characteristic that it becomes lower than the saturated vapor pressure of the refrigerant at a low temperature as described above, the valve element 3 lifts as described above, and the refrigerant becomes Since the lubricant flows even in such a low temperature state, the lubricant does not become insufficient.

FIG. 3 is a longitudinal sectional view showing a modification of the volatile liquid-filled bellows operation type flow control valve 20. Control valve 2
Reference numeral 0 denotes a first housing 24 having a conical top wall provided with an inlet pipe 40 in the center and a cylindrical body, and a second housing having a conical bottom wall provided with an outlet pipe 42 in the center. Three
8 and 8 are joined vertically by circumferential flanges 50 and 52, which are integrally provided around the ends of the body, respectively, to form a main body. Peripheral flanges of the upper and lower dish-shaped frames 32 and 34 of the control valve assembly, which are generally designated by the reference numeral 30, are sandwiched and held by the flanges 50 and 52 in an overlapping manner. The upper dish-shaped frame 32 has a tubular body 54 crimped and fitted into a central hole of a top wall thereof, and a lower end portion of the tubular body 54 is fitted into the central hole of the upper wall of the bellows 23. 52 is fitted and fixed. The sealing tube 52 is, for example, R-5.
Used when encapsulating a volatile liquid such as 00 in the bellows 23, it is melted and closed after use to seal the volatile liquid. Further, the enclosing tube 52 also serves to support the bellows 23 with respect to the upper frame 32.

The bellows 23 is made of a thin plate of stainless steel for springs, and carries a disc-shaped valve element 56 made of an elastic plastic material such as polytetrafluoroethylene at its bottom wall. The valve element 56 faces a convex valve seat 58 provided at the center of the lower frame 34. With this configuration, the relative position of the valve element 56 and the valve seat 58 changes due to the expansion and contraction of the bellows 23, and the flow rate of the refrigerant changes. In the above structure, the upper frame 3
2 has a large number of through holes, through which the refrigerant from the condenser 14 can pass through the pipe 40, enter the flow valve body, and reach the periphery of the bellows 23. Since the lower frame 34 has no through hole other than the valve hole provided at the center of the valve seat 58, the refrigerant is formed in the outlet below the lower frame unless it passes through the valve hole. Cannot flow into the chamber. Therefore, the flow rate of the refrigerant flowing from the outlet pipe 42 into the expansion device 18 can be controlled by the degree of expansion and contraction of the bellows 23.

The housing and the upper and lower frames of the flow control valve having the above structure can be manufactured at low cost by punching a metal plate. The operating principle of the flow control valve is
The flow control valve shown in FIG. 2 is similar to that described above, and therefore its description is omitted.

[0018]

EFFECTS OF THE INVENTION With a structure in which a volatile liquid-filled bellows operation type flow control valve is provided between a condenser and an expansion device of a refrigerating and refrigerating system, a refrigerator and a refrigerator operate in a steady state, an overload state and a low load state. In any of the above cases, it becomes possible to operate the refrigeration system efficiently. Furthermore, a volatile liquid is enclosed in the bellows, and the bellows is expanded and contracted by the relative relationship between the saturated vapor pressure of the volatile liquid in the bellows and the saturated vapor pressure of the refrigerant in the refrigeration system. Since the flow rate from the condenser of the refrigeration / refrigeration system to the expansion device can be controlled, the refrigeration / refrigeration system can be automatically and optimally controlled without the need for an electrical control valve or control circuit, so the refrigeration / refrigeration system can be manufactured at a low price. It can be something.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating a refrigerating and refrigerating system embodying the present invention.

FIG. 2 is a cross-sectional view showing a volatile liquid-filled bellows operation type flow control valve used in the refrigerating and refrigerating system of the present invention.

FIG. 3 is a cross-sectional view showing a modified example of a volatile liquid-filled bellows operation type flow control valve.

FIG. 4: Saturated vapor pressure of filled liquid and refrigerant v. s. The graph which shows a temperature characteristic.

[Explanation of symbols]

 1 Housing 2 Bellows 3 Valve Element 4 Valve Seat 5 Inlet 6 Outlet 10 Refrigerating / Refrigerating System 12 Compressor 14 Condenser 16 Evaporator 18 Expander 20 Volatile Liquid Filled Bellows Operated Flow Control Valve 23 Bellows 24 First Housing 30 Valve Set Solid 32 Upper frame 34 Lower frame 38 Second housing 40 Inlet pipe 42 Outlet pipe 50 Flange 52 Flange 56 Valve element 58 Valve seat

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[Procedure amendment]

[Submission date] April 6, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a schematic diagram showing a gas compression type freezing / refrigerating system 10 used in a home refrigerator / freezer. The freezing / refrigerating system 10 is a circuit in which a refrigerant such as R- 12 is enclosed, and the compressor 12 compresses the refrigerant and circulates the sending circuit. The refrigerant from the compressor 12 releases heat to the outside in the condenser 4 to be liquefied, and the expansion device 1
It flows into the evaporator 16 via 8 and is adiabatically expanded and vaporized. As the expansion device 18, a capillary tube having a relatively large diameter is used, and the refrigerant is squeezed by the capillary tube and the post-evaporator 1 is used.
It flows into 6 and expands rapidly and vaporizes. As a result of the vaporization of the refrigerant,
The refrigerant absorbs heat in the freezer and returns to the compressor 12,
Then, it is compressed again, and the heat absorbed by the evaporator 16 is discharged to the outside in the condenser 14 to be liquefied. By repeating this process , the heat in the freezer-refrigerator is absorbed and released by the refrigerant, and the temperature in the refrigerator is lowered. The temperature inside the refrigerator-freezer is maintained at a predetermined temperature by intermittently operating the compressor 12 by a temperature controller (not shown) provided inside the refrigerator-freezer. In the above refrigerating and refrigerating system, in the present invention, the volatile liquid-filled bellows operation type flow control valve 20 of the condenser 14 and the expansion device 18 is provided to ensure the operation of the refrigerating and refrigerating system 10 and improve the operation efficiency. ing.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

FIG. 2 shows a schematic structure of the volatile fluid-filled bellows operation type flow control valve 20. The upper end of a metal bellows 2 having elasticity is fixed to the upper wall of the valve housing 1. The lower end of the bellows 2 carries a conical valve element 3, and the tip of the valve element 3 projects into the valve hole in the center of the valve seat 4. The medium from the condenser 14 flows into the housing 1 from the inlet 5, passes through the valve hole of the valve seat 4, and flows into the expansion device 18 from the outlet 6. The bellows 2 expands and contracts according to the pressure and temperature of the medium, the valve element 3 moves up and down, and the lift with respect to the valve seat 4 is changed. Thereby, the flow rate of the refrigerant to the expansion device 18 is controlled. In the bellows 2, volatile liquid,
Preferably, R-500 is encapsulated.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

When a large load is applied to the refrigerating / refrigerating system such as by pouring a large amount of food or the like into the freezer / refrigerator, the temperature of the refrigerant becomes the upper limit of the steady state range (43 ° C. in this embodiment).
As a result, the saturated vapor pressure inside the bellows 2 becomes lower than the saturated vapor pressure of the refrigerant, so the bellows 2 contracts and the valve element 3 of the valve seat lifts greatly. For this reason, a large amount of the refrigerant flows into the evaporator through the expansion device, so that the evaporation of the refrigerant is promoted, whereby the inside of the refrigerator-freezer is quickly cooled. Further, in a relatively low temperature state in which the surroundings of the refrigerator / freezer are lower than the lower limit of the steady state temperature range (10 ° C. in this embodiment), the saturated vapor pressure in the bellows 2 is lower than the saturated vapor pressure of the refrigerant. Therefore, the valve element 3 lifts and the refrigerant flows to the expansion device 18. In such a state, the refrigerant temperature does not rise even if the compressor 12 operates,
If the valve element 3 is seated on the valve seat 4 and the valve hole is kept closed, the refrigerant accumulates in the condenser 14, and the flow of the lubricant mixed in the refrigerant also deteriorates. It becomes insufficient and the compressor 12 is likely to be damaged. However, since the saturated vapor pressure of the volatile filled liquid in the bellows 2 has the characteristic that it becomes lower than the saturated vapor pressure of the refrigerant at a low temperature as described above, the valve element 3 lifts as described above, and the refrigerant becomes Since the lubricant flows even in such a low temperature state, the lubricant does not become insufficient. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 22, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a schematic diagram showing a gas compression type freezing / refrigerating system 10 used in a home refrigerator / freezer. The refrigeration system 10 is a circuit in which a refrigerant such as R-12 is sealed, and the compressor 12 compresses the refrigerant and circulates the sending circuit. The refrigerant from the compressor 12 releases heat to the outside in the condenser 14 and is liquefied, flows into the evaporator 16 through the expansion device 18, adiabatically expands, and is vaporized. As the expansion device 18, a capillary tube having a relatively large diameter is used, and the refrigerant is squeezed by the capillary tube and the post-evaporator 1 is used.
It flows into 6 and expands rapidly and vaporizes. As a result of the vaporization of the refrigerant,
The refrigerant absorbs heat in the freezer and returns to the compressor 12,
Then, it is compressed again, and the heat absorbed by the evaporator 16 is discharged to the outside in the condenser 14 to be liquefied. By repeating this process, heat in the refrigerator / freezer is absorbed and released by the refrigerant, and the temperature in the refrigerator is lowered. The temperature inside the refrigerator-freezer is maintained at a predetermined temperature by intermittently operating the compressor 12 by a temperature controller (not shown) provided inside the refrigerator-freezer. In the above refrigerating and refrigerating system, in the present invention, the volatile liquid-filled bellows operation type flow control valve 20 of the condenser 14 and the expansion device 18 is provided to ensure the operation of the refrigerating and refrigerating system 10 and improve the operation efficiency. ing.

Claims (3)

[Claims] 1. A refrigerating refrigerator that condenses and liquefies a refrigerant compressed by a compressor and then liquefies it into an evaporator through an expansion device and vaporizes it by adiabatic expansion, thereby releasing heat into the atmosphere. A refrigerating and refrigerating system for cooling the inside, wherein a fluid filled bellows operation type flow control valve is provided between the condenser and the expansion device. 2. The refrigeration system according to claim 1, wherein the fluid-filled bellows flow control valve has a flow valve main body having an inlet for introducing the refrigerant from the condenser and an outlet for supplying the refrigerant to the expansion device. A bellows, which is provided in the main body and in which a refrigerant from the condenser is introduced, and in which a volatile liquid is sealed, a valve element operated by the bellows, and the valve element cooperate with each other. A medium having a valve seat and flowing into the inflow chamber is configured to flow to the outlet through a valve hole provided in the valve seat, and the saturated vapor pressure of the volatile liquid in the bellows. However, within the steady operating temperature range of the refrigeration system, higher than the saturated vapor pressure of the refrigerant, outside the steady operating temperature range,
A refrigerating and refrigerating system characterized in that the saturated vapor pressure of the refrigerant is lower. 3. The refrigerating and refrigerating system according to claim 2, wherein the bellows has an upper surface held in the valve body and a lower surface holding the valve element.