JP2544030B2 - Refrigeration equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention compresses a refrigerant in a compressor, condenses it in a condenser, sends it to an evaporator via a liquid receiver and a main expansion mechanism, and then re-compresses the refrigerant from the evaporator. The present invention relates to a refrigerating device that is returned to the machine.

[0002]

2. Description of the Related Art This type of refrigerating apparatus is used in various fields. For example, parts, assemblies, units, etc. related to electricity and electronics are exposed to predetermined high and low temperatures to protect them from environmental resistance and thermal shock. For environmental test equipment such as temperature cycle test equipment and environmental stress screening equipment that check the properties and perform stress screening, supercooling means is attached to improve the refrigerating capacity of the equipment when the temperature drops. There are many things that have been done. A typical example of such a conventional refrigeration system is shown in FIGS. 2 and 3.

In the refrigerating apparatus shown in FIG. 2, the refrigerant is compressed by the compressor CP, condensed by the condenser CD, guided to the evaporator EV via the liquid receiver LR and the main expansion mechanism EX, and again compressed by the compressor CP.
While returning the refrigerant to the subcooling heat exchanger HE between the liquid receiver LR and the main expansion mechanism EX, the heat exchanger HE is cooled by the separately prepared subcooling refrigerator unit RU. By doing so, the refrigerant in the main circuit is supercooled by the heat exchanger HE to improve the refrigerating capacity.

In the refrigerating apparatus shown in FIG. 3, the refrigerant is compressed by the compressor CP, condensed by the condenser CD, guided to the evaporator EV via the liquid receiver LR and the main expansion mechanism EX, and again compressed by the compressor CP.
The refrigerant discharged from the liquid receiver LR is connected to the on-off valve V while the liquid receiver LR reaches the main expansion mechanism EX.
1, regenerator expansion mechanism AE, regenerator CL and main cooling valve V2
Flow through to the main expansion mechanism EX in sequence, the valve V1 and the cold storage expansion mechanism AE are provided with a subcooling bypass valve V3 in parallel, and the compressor suction side and the cold storage tank C are provided.
The outlet side of L is connected by piping via a cold storage bypass valve V4.

In this device, while the refrigeration system is on standby, the valves 2 and V3 are closed and the valves V1 and V4 are opened to allow the refrigerant to pass from the cold storage expansion valve AE to the cold storage tank CL, and from there, the cold storage bypass valve. It operates so as to return to the compressor via V4. Thus, the brine in the cold storage tank CL is cooled and stored in the brine. During the original cooling operation, the valves V1 and V4 are closed and the valves V2 and V3 are opened. Thus, the refrigerant discharged from the liquid receiver LR flows through the subcooling bypass valve V3 to the cold storage tank CL, where it is subcooled and then passes through the main cooling valve V2 and the main expansion mechanism EX to the evaporator E.
Flow to V. The refrigerating capacity is improved as much as the refrigerant is supercooled in the cold storage tank CL.

[0006]

However, according to the conventional apparatus shown in FIG. 2, since the subcooling refrigerator unit RU is required separately from the main refrigeration apparatus, an extra installation space is required, and Initial cost and running cost are high. Further, according to the conventional device of FIG. 3, a cold storage brine is required in the cold storage tank CL, and normally the latent heat of solidification of the brine is used. In that case, the supercooling temperature is lowered to the melting temperature of the brine or lower. It is not possible. In addition, since the heat of solidification and melting of the cold storage brine is used, the heat exchanger in the cold storage tank CL becomes large, and the entire cold storage tank becomes large accordingly, which requires a large installation space. Further, since the temperature of the brine in the cold storage tank gradually rises, there is a problem that the supercooling temperature changes with time and the refrigerating capacity also changes.

Therefore, in the present invention, the refrigerant is compressed by the compressor and condensed by the condenser, and then sent to the evaporator through the liquid receiver and the main expansion mechanism, and then returned from the evaporator to the compressor. In such a refrigeration system, the refrigerant discharged from the condenser can be supercooled and then flowed to the main expansion mechanism, and as a result, the entire system is downsized as compared with the conventional refrigeration system equipped with the supercooling means. It is an object of the present invention to provide a refrigerating apparatus that requires less space for installing the apparatus, can arbitrarily change the supercooling temperature, and can secure a certain refrigerating capacity.

[0008]

In order to solve the above-mentioned problems, the present invention compresses a refrigerant with a compressor and condenses it with a condenser, and then transfers it to an evaporator via a liquid receiver and a main expansion mechanism. In the refrigerating device which is sent and returned from the evaporator to the compressor again, an expansion mechanism for regenerator, an open flash type regenerator and an openable / closable main cooling valve are provided between the liquid receiver and the main expansion mechanism. The gas phase part of the liquid receiver and the gas phase part of the regenerator can be connected via a pressure equalizing bypass valve that can be opened and closed, and the suction side of the compressor and the gas phase part of the regenerator can be opened and closed. The present invention provides a refrigeration system characterized in that the refrigeration system is connected via the cold storage bypass valve.

[0009]

According to the refrigerating apparatus of the present invention, when the refrigerating apparatus is on standby, the liquid refrigerant accumulated in the liquid receiver cools the open flash type regenerator through the regenerator expansion mechanism. The refrigerant evaporated in the regenerator is sucked into the compressor through the regenerator bypass valve. At the same time, the refrigerant accumulated in the regenerator also self-cools to the saturation temperature, becomes a supercooled liquid, and accumulates a certain amount to store the cold.

On the other hand, during the original cooling operation, the bypass valve for cold storage and the expansion mechanism for cold storage are closed, the bypass valve for pressure equalization and the main cooling valve are opened, and the supercooled liquid refrigerant in the regenerator is expanded. It flows through the mechanism to the evaporator and cools its ambient atmosphere.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. In the refrigerating apparatus of FIG. 1, the refrigerant is compressed by the compressor 1, condensed by the condenser 2, and then sent to the evaporator 5 via the liquid receiver 3 and the main expansion valve 4, and then compressed again from the evaporator. Machine 1
The basic configuration is to return to. In the illustrated example, the evaporator 5 is arranged in the test tank 10 of the thermostat.

In this refrigeration system, the regenerator expansion valve 6 and the regenerator 7 are further provided on the way from the liquid receiver 3 to the main expansion valve 4.
And the main cooling valve 8 is connected in this order. Further, the vapor phase portions of the liquid receiver 3 and the regenerator 7 are connected via a pressure equalizing bypass valve 80. Further, the gas phase portion of the regenerator 7 is connected to the suction side of the compressor 1 via the regenerator bypass valve 9.

The regenerator 7 is a so-called open flash type regenerator in which the refrigerant stored therein self-cools by self-evaporation. According to this refrigeration system, the condensed refrigerant accumulated in the liquid receiver 3 passes through the cold storage expansion valve 6 and cools the regenerator 7 when the device is on standby. Further, the refrigerant evaporated in the regenerator 7 passes through the regenerator bypass valve 9 and passes through the compressor 1
Is sucked into. At the same time, the liquid refrigerant accumulated in the regenerator 7 is also self-cooled to the saturation temperature, becomes a supercooled liquid, and a certain amount is accumulated and stored.

On the other hand, when the cooling operation is performed by the temperature drop signal from the temperature sensor (not shown) in the test tank 10, the cold storage bypass valve 9 is closed and the pressure equalizing bypass valve 80 and the main cooling valve 8 are opened. Thus, the supercooled liquid refrigerant in the regenerator 7 reaches the evaporator 5 in the test tank through the main expansion valve 4, and is returned to the compressor 1 from there. Thus, the evaporator 5 cools the inside of the test tank to a predetermined temperature.

According to the refrigerating apparatus described above, the regenerator 7
Since it is an open flash type and does not require a heat exchanger, it has the advantage of being able to supercool the refrigerant, yet simplifying the overall structure, and making it compact to save installation space. is there. Further, the supercooling temperature of the refrigerant can be arbitrarily changed by adjusting the cold storage expansion valve 6, and the supercooling temperature can be adjusted to an optimum value depending on the load in the test tank 10, the capacity of the compressor 1, and the like. Furthermore, when the test tank 10 is cooled, the maximum and constant refrigerating capacity is ensured by the circulation of the supercooled liquid in the regenerator at a constant temperature.

[0016]

As described above, according to the present invention, the refrigerant is compressed by the compressor and condensed by the condenser, and then sent to the evaporator through the liquid receiver and the main expansion mechanism, and the evaporation is performed. Refrigerating device to return to the compressor from the compressor, can be flowed to the main expansion mechanism after cooling the refrigerant exiting the condenser, yet compared to a conventional refrigerating device equipped with supercooling means, It is possible to provide a refrigerating apparatus in which the entire apparatus is downsized, the apparatus installation space is reduced accordingly, the supercooling temperature can be arbitrarily changed, and a certain refrigerating capacity can be secured.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional example.

FIG. 3 is an explanatory diagram of another conventional example.

[Explanation of symbols]

 1 Compressor 2 Condenser 3 Liquid receiver 4 Main expansion valve 5 Evaporator 6 Cooling expansion valve 7 Regenerator 80 Equalization bypass valve 8 Main cooling valve 9 Cooling bypass valve 10 Incubator test tank

Claims (1)

(57) [Claims] 1. A refrigerant is compressed by a compressor and condensed by a condenser, and then sent to an evaporator via a liquid receiver and a main expansion mechanism, and then returned from the evaporator to the compressor again. In the refrigeration apparatus described above, an expansion mechanism for regenerator, an open flash type regenerator, and an openable / closable main cooling valve are connected between the receiver and the main expansion mechanism, and the vapor phase portion of the receiver and the cold storage The gas phase portion of the container is connected via a pressure equalizing bypass valve that can be opened and closed, and the suction side of the compressor and the gas phase portion of the regenerator are connected via an open and close cool storage bypass valve. Refrigerating device.