JPS61205755A - 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] [Industrial application field] This invention relates to a refrigeration system.

[Conventional technology]

FIG. 2 is a refrigerant system diagram of a conventional refrigeration system.

In FIG. 2, 1 is a compressor, 2 is a discharge pipe through which the gas refrigerant compressed by the compressor 1 is passed, 3 is a heat storage tank containing a heat storage material 31, and 4 is a heat storage tank that stores the heat of the compressed gas refrigerant through the heat storage material 31. 5 is a bypass pipe that bypasses the entrance and exit of the heat exchanger 4, 6 is a condenser, 7 is a liquid pipe that passes the liquid refrigerant condensed in the condenser 6, and 8 is provided in the liquid pipe 7. solenoid valve,
9 is a bypass pipe connecting the discharge pipe 2 and the outlet side portion of the solenoid valve 8 of the liquid pipe 7; 10 is a high-temperature gas refrigerant solenoid valve provided in the bypass pipe 9; 11 is an expansion mechanism such as an expansion valve; 12
13 is an evaporator; 14 is a suction pipe connecting the outlet of the evaporator 13 and the compressor 1; 15 is a suction-side solenoid valve provided in the suction pipe 14;
Reference numeral 17 denotes a suction side heat exchanger that bypasses the suction side electromagnetic valve 16 and is provided in the heat storage tank 3 via the pressure reducing valve 16 to exchange heat with the heat storage material 31.

Next, the operation of this refrigeration system will be explained.

During cooling operation, high-temperature gas refrigerant compressed by the compressor 1 passes through the discharge pipe 2 and is transferred to the heat storage material 3 in the heat storage tank 3 by the heat exchanger 4.
1 and stores the heat in the heat storage material 31.

A part of the gas refrigerant passes through the bypass pipe 5 without passing through the heat exchanger 4, joins with the refrigerant exiting the heat exchanger 4, and enters the condenser. During cooling operation, the solenoid valve 8 and suction side solenoid valve 15 of the liquid pipe I are open, and the high temperature gas refrigerant solenoid valve 10 and bypass Kanken valve 12 are closed, so the liquid refrigerant condensed in the condenser 6 flows into the liquid pipe 7. The air is depressurized by the expansion mechanism 11, evaporated by the evaporator 13, cools the object to be cooled, and then passes through the suction pipe 14 and the suction side electromagnetic valve 15, and returns to the compressor 1 again. Note that the bypass pipe 5 is only for preventing the heat storage material 31 from overheating.

Also, during defrosting, the solenoid valve 8 of the liquid pipe 7 and the suction side solenoid valve 15 are closed, the high temperature gas refrigerant solenoid valve 10, and the bypass solenoid valve 1.
2 is open. The high temperature gas refrigerant compressed by the compressor 1 is then transferred to a discharge pipe 2, a heat exchanger 4, a bypass pipe 9,
High temperature gas refrigerant solenoid valve 10, liquid piping 7, bypass solenoid valve 1
2 and is supplied to the evaporator 13. In the evaporator 13, the high-temperature gas refrigerant exchanges heat with the frost adhering to the evaporator 13, melts and removes the frost, and liquefies the refrigerant. Evaporator 13f: The liquefied refrigerant is depressurized from the suction pipe 4 by the pressure reducing valve 16, enters the suction side heat exchanger 17, and is transferred to the heat storage material 3 in the heat storage tank 3.
It exchanges heat with compressor 1, reevaporates, and returns to compressor 1.

[Problem that the invention seeks to solve]

In the conventional refrigeration system as described above, the size of the bypass pipe 5 that bypasses the heat storage tank 3 is selected based on the maximum capacity of the compressor 1 combined with the defrosting means. is selected so that it does not boil. For this reason,
When combined with a small-capacity compressor 1, the large diameter of the bypass pipe 5 reduces the amount of gas refrigerant passing through the heat exchanger 4, and the amount of heat exchanged with the P heat storage material 31 decreases due to the decrease in refrigerant flow rate. There is a problem in that the amount of heat of re-evaporation of the refrigerant liquefied during defrosting operation decreases, resulting in defrosting failure and liquid backlash.

The object of the present invention is to solve the above-mentioned problems and provide a refrigeration system that can perform good defrosting for everything from small-capacity compressors to large-capacity compressors.

[Means for solving problems]

The present invention provides a refrigeration system as described above, in which an on-off valve is provided in the bypass piping of the heat exchanger.

[Effect]

In the refrigeration system according to the present invention, the on-off valve is closed or opened to a small degree in the case of a small-capacity compressor, and opened or opened to a large degree in the case of a large-capacity compressor, so that the compressed high-temperature refrigerant is The amount passing through the bypass piping and heat exchanger can be controlled, and in the case of a small-capacity compressor, it prevents insufficient heat storage in the heat storage material, eliminates defrosting defects and liquid backlog caused by this, and also prevents large-capacity compressors. In the case of a high-capacity compressor, overheating of the heat storage material can be prevented.

〔Example〕

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

In Figure 1, the same symbols as in Figure 2 indicate corresponding parts,
18 is an on-off valve provided in the middle of bypass piping 5 that bypasses heat exchanger 4. The structure of this embodiment other than the above is the same as the conventional one shown in FIG.

Next, the operation of the refrigeration system of this embodiment will be explained.

If the compressor 1 has a large capacity, open the on-off valve 18,
Cooling and defrosting operations similar to those of the conventional refrigeration system described above are performed.

When the capacity of the compressor 1 is small, the on-off valve 18 is closed. During cooling operation, the high temperature gas refrigerant compressed by the compressor 1 is passed through the discharge pipe 2, and the entire amount of the high temperature gas refrigerant is transferred to the heat storage tank 3.
It flows into the heat exchanger 4 inside, exchanges heat with the heat storage material 31, and enters the condenser 6. Since the solenoid valve 8 and the suction side solenoid valve 15 of the liquid pipe I are open, and the high temperature gas refrigerant solenoid valve 10 and the bypass solenoid valve 12 are closed, the refrigerant liquefied in the condenser 6 passes through the liquid pipe 7 and enters the expansion mechanism. The pressure is reduced in step 11, evaporated in evaporator 13, passed through suction pipe 14 and suction-side solenoid valve 15, and returned to compressor 1.

Also, during defrosting, the solenoid valve 8 of the liquid pipe 7 and the suction side solenoid valve 15 are closed, the high temperature gas refrigerant solenoid valve 10, and the bypass solenoid valve 1.
2 is open. The high temperature gas refrigerant compressed by the compressor 1 passes through a discharge pipe 2, a heat exchanger 4, a bypass pipe 9, a high temperature gas refrigerant solenoid valve 10, a liquid pipe 7, a bypass solenoid valve 12, and is supplied to an evaporator 13. be done. In the evaporator 13, the high-temperature gas refrigerant exchanges heat with the frost attached to the evaporator 13, defrosts it, and liquefies it. The liquefied refrigerant passes through the suction pipe 14 from the evaporator 13, is depressurized by the pressure reducing valve 16, exchanges heat with the heat storage material 31 in the suction side heat exchanger 17 in the heat storage tank 3, and evaporates. In this case, since the entire amount of high-temperature refrigerant gas discharged from the compressor 1 flows into the heat exchanger 4, heat is sufficiently stored in the heat storage material 31, and from this heat storage material 31 to the suction side heat exchanger 17. Since the liquid refrigerant receives heat, the liquid refrigerant reliably evaporates and returns to the compressor 1.

In the above-described embodiment, the on-off valve 1B is only opened and closed, but in the present invention, the opening degree of the on-off valve may be controlled to vary depending on the capacity of the compressor.

〔Effect of the invention〕

As explained above, according to the present invention, an on-off valve is provided in the bypass pipe that leads the high-temperature refrigerant compressed by the compressor to the condenser side, bypassing the heat exchanger that exchanges heat with the heat storage material. , close this on-off valve in the case of a small capacity compressor,
In the case of a large-capacity compressor, by opening the In some cases, overheating of the heat storage material can be prevented, and therefore, the effect can be obtained that it can be used from a small capacity compressor to a large capacity compressor.

[Brief explanation of drawings]

FIG. 1 is a refrigerant system diagram showing an embodiment of a refrigeration system according to the present invention, and FIG. 2 is a refrigerant system diagram showing a conventional refrigeration system. 1... Compressor, 2... Suction piping, 3... Heat storage tank,
31... Heat storage material, 4... Heat exchanger, 5... Bypass piping, 6... Condenser, 11... Expansion mechanism, 13...
...Evaporator, 14...Suction piping, 17...Suction side heat exchanger, 18...Opening/closing valve. Note that the same reference numerals in the figures indicate the same or corresponding parts. Deputy Masuo Oiwa (2 people) 1st
Figure 1, Ifni 4 U2 Raft'β' KanP! J+ Figure 2 procedural amendment (voluntary)

Claims (1)

[Claims] A compressor that compresses refrigerant, a heat exchanger that exchanges heat with a heat storage material for the high-temperature refrigerant compressed by the compressor, a condenser that condenses the refrigerant that has passed through the heat exchanger, and an expansion mechanism that condenses the refrigerant in the condenser. It is connected by piping to an evaporator that evaporates the depressurized refrigerant to cool the object to be cooled, and also has a suction side heat exchanger that exchanges heat with the heat storage material. In a refrigeration system in which refrigerant is supplied to an evaporator, the liquid refrigerant discharged from the evaporator is re-evaporated in a suction-side heat exchanger, and then sucked into a compressor, the high-temperature refrigerant compressed by the compressor is heat exchanged. A refrigeration system characterized in that an on-off valve is provided in bypass piping that bypasses the container and leads to the condenser side.