JPH051966U - Refrigeration equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent introduction of a liquid refrigerant into a compressor and to prevent deterioration of capacity during cooling operation. [Composition] A compressor, a condenser, a throttle device, an evaporator, and heat exchange passages respectively provided on the high-pressure side and the low-pressure side and a heat storage tank containing a heat storage agent are provided, and the low-pressure side heat exchange passage is an intake bypass. In the refrigeration apparatus connected to the refrigeration cycle by a pipe as a parallel circuit, a suction accumulator is provided in the suction bypass pipe downstream of the low-pressure side heat exchange passage of the heat storage tank. [Effect] Even in the case of a liquid returning phenomenon that occurs during defrosting, introduction into the compressor in the liquid refrigerant state is prevented, the compressor is protected, and a decrease in capacity during cooling operation is also prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a refrigerating device, and more particularly to a refrigerating device for a refrigerator or a freezer.

[0002]

[Prior Art]

 FIG. 2 is a configuration diagram of a conventional refrigeration cycle, which includes a compressor 1, a condenser 2, a throttle device 3, a vaporizer 4, a suction accumulator 5, and a discharge pipe 6, a liquid pipe 7, a suction pipe 8, which connect them to each other. A refrigerating cycle is constituted by. The heat storage tank 9 for defrosting hot gas contains therein a heat storage agent 9a, a high-pressure side heat exchange passage 10, and a low-pressure side heat exchange passage 11, and the high-pressure side heat exchange passage 10 is connected to the compressor 1. It is provided in the middle of the discharge pipe 6 that connects the condenser 2. A three-way solenoid valve 12 is provided on the outlet side of the high-pressure side heat exchange passage 10, a first outlet side of the three-way solenoid valve 12 is connected to the inlet side of the condenser 2, and a second outlet side is a liquid pipe. It is connected to the discharge bypass pipe 6a connected in the middle of 7. A check valve 13 is connected between the condenser 2 of the liquid pipe 7 and the connection portion of the discharge bypass pipe 6a in the flow direction from the condenser 2 to the expansion device 3.

Next, a second electromagnetic valve 14 is connected to the upstream side of the expansion device 3, and its inlet side and the outlet side of the expansion device 3 are connected to the liquid bypass pipe 7 a and the third electromagnetic valve 15. . A fourth solenoid valve 16 is provided in the suction pipe 8, and a suction pressure regulating valve 17 and a low-pressure side heat exchange passage 11 are connected as a parallel circuit on the inlet side and the outlet side by a suction bypass pipe 8a. ing. In addition, 14, 15, 16 are second, third, and fourth solenoid valves, 18 is a condenser blower, and 19 is a cooler blower, respectively.

Next, the operation will be described. First, during the cooling operation, the refrigerant flows as indicated by the solid arrow in the refrigerant system diagram to perform the cooling operation. That is, the second solenoid valve 14 and the fourth solenoid valve 16 are energized to open the circuit, and the three-way solenoid valve 12 is in the non-energized state to communicate the high pressure side heat exchange passage 10 and the condenser 2 with each other. No. 15 is closed without being energized.

On the other hand, the heat storage agent 9 a in the heat storage tank 9 is heated when the refrigerant gas discharged from the compressor 1 is energized through the high pressure side heat exchange passage 10. The heat storage tank 9 stores a low-pressure side heat exchange passage, which is used as a re-evaporator in combination with the suction pressure adjusting valve 17 during hot gas defrosting.

Next, the defrosting operation will be described. When frost formation on the evaporator 4 is detected by a defrost detector (not shown) and hot gas defrosting is started, the three-way solenoid valve 12 and the third solenoid valve 15 are energized, and the second and fourth solenoid valves are energized. 14, 16 are not energized and become the refrigerant flow indicated by the broken line arrow in FIG. That is, the high-pressure refrigerant gas discharged from the compressor 1 evaporates via the high-pressure side heat exchange passage 10, the three-way solenoid valve 12, the discharge bypass pipe 6a, the liquid pipe 7, the liquid bypass pipe 7a, and the third solenoid valve 15. When defrosting is performed in the vessel 4, the liquefied refrigerant remains at high pressure. Then, the liquefied high-pressure liquid refrigerant is first decompressed by the suction pressure adjusting valve 17 and then vaporized by exchanging heat with the heat storage agent in the low-pressure side heat exchange passage 11 and is sucked into the compressor 1. At this time, the suction pressure adjusting valve 17 is set below the upper limit suction pressure so that the suction pressure of the compressor 1 does not exceed the allowable pressure value. When the defrosting of the evaporator 4 is completed, the defrosting detector (not shown) switches to the cooling operation.

[0007]

[Problems to be solved by the device]

 The conventional refrigeration system is configured as described above, and immediately after the start of defrost, the liquid refrigerant in the circuit returns to the compressor 1 via the low-pressure side heat exchange passage 11, but a large amount of liquid temporarily flows, In the low-pressure side heat exchange passage 11, the liquid refrigerant cannot be completely evaporated and is partially introduced into the compressor 1 as a liquid refrigerant. However, if sucked into the compressor 1 in the state of liquid refrigerant, there is a danger that the compressor 1 will be damaged by liquid compression and the like, so a suction accumulator 5 was provided immediately before the compressor 1 to deal with it. However, the suction accumulator 5 has a large pressure loss due to the internal structure, the pipe diameter, the shape, etc., which causes a decrease in the capacity during the cooling operation.

The object of the present invention is to solve the above-mentioned conventional problems, and to prevent introduction into a compressor in the state of a liquid cooling medium and to prevent deterioration of capacity during cooling operation. To provide a device.

[0009]

[Means for Solving the Problems]

 A refrigeration system according to the present invention comprises a compressor, a condenser, a throttle device, an evaporator, and heat exchange paths provided on the high pressure side and the low pressure side, respectively, and a heat storage tank containing a heat storage agent. In a refrigeration system in which an exchange path is connected as a parallel circuit to a refrigeration cycle by a suction bypass pipe, a suction accumulator is provided in the suction bypass pipe downstream of the low-pressure side heat exchange passage of the heat storage tank. .

[0010]

[Action]

 In the refrigerating apparatus of the present invention, the liquid refrigerant that cannot be completely evaporated in the heat exchange passage on the low pressure side immediately after the start of defrost is temporarily stored in the accumulator, and only the gas refrigerant is supplied to the compressor.

[0011]

【Example】

 Hereinafter, the refrigerating apparatus of the present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram showing a refrigerating apparatus 20 according to an embodiment of the present invention. The refrigerating cycle of the refrigerating apparatus 20 of the present invention is basically the same as the conventional refrigerating cycle shown in FIG. 2, and includes a compressor 1, a condenser 2, a throttle device 3, an evaporator 4, and a refrigerating cycle, respectively. It is composed of a discharge pipe 6, a liquid pipe 7, and a suction pipe 8 which connect the above. However, in the refrigeration system 20 of this embodiment, the suction accumulator 5 is not installed in the suction pipe 8 as in the conventional case, and the suction pipe 8 on the outlet side of the fourth solenoid valve 16 is directly connected to the inlet of the compressor 1. Connected to the side.

A suction accumulator 21 is installed in the suction bypass pipe 8 a that connects the low-pressure side heat exchange passage 11 and the suction pipe 8 on the outlet side of the fourth solenoid valve 16. Since other configurations are similar to those of the conventional refrigerating apparatus shown in FIG. 2, corresponding parts are designated by the same reference numerals and description thereof is omitted.

In the refrigerating apparatus 20 of the above-described embodiment, during the normal cooling operation shown by the solid line arrow, the suction pipe 8 does not have the suction accumulator that causes pressure loss, so that the capacity does not decrease. Further, since the suction accumulator 21 is provided in the suction bypass pipe 8a which is the downstream portion of the low pressure side heat exchange passage 11 of the defrost circuit, the liquid refrigerant which cannot be completely evaporated in the low pressure side heat exchange passage 11 immediately after the defrost start is temporarily stored in the accumulator. It is stored in 21 and only the gas refrigerant is supplied to the compressor 1.

[0014]

[Effect of the device]

 As described above, according to the refrigerating apparatus of the present invention, the defrost circuit is provided with an accumulator, and it is possible to operate under conditions with less pressure loss during normal cooling operation, so that the capacity drop is suppressed as much as possible and the liquid return that occurs during defrosting. At the time of the phenomenon, the accumulator in the defrost circuit can store the liquid and protect the compressor.

[Submission date] June 28, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

[Action]

In the refrigeration apparatus of the present invention may have liquid refrigerant that fully evaporated in the low-pressure side heat exchanger immediately after defrosting start is stored within one Tokia accumulator, only the gas refrigerant is Ru is supplied to the compressor.

[Brief description of drawings]

FIG. 1 is a block diagram showing a refrigerating apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional refrigeration system.

[Explanation of symbols]

 1 Compressor 2 Condenser 3 Throttle device 4 Evaporator 6 Discharge pipe 7 Liquid pipe 8 Suction pipe 8a Suction bypass pipe 9 Heat storage tank 9a Heat storage agent 10 High pressure side heat exchange passage 11 Low pressure side heat exchange passage 20 Refrigeration equipment 21 Suction accumulator

Claims (1)

[Claims for utility model registration] Claims: 1. A compressor, a condenser, a throttle device, an evaporator, a heat exchange path provided on each of a high pressure side and a low pressure side, and a heat storage tank containing a heat storage agent. A refrigeration system in which the low-pressure side heat exchange passage is connected as a parallel circuit to a refrigeration cycle by a suction bypass pipe, wherein a suction accumulator is provided in the suction bypass pipe downstream of the low-pressure side heat exchange passage of the heat storage tank. Refrigerating device characterized by.