JPH0828974A - Cold heat carrying equipment - Google Patents

Abstract

PURPOSE:To use no water as a heating medium and to attain simplification of piping work and others by taking a means of constructing a closed cycle by connecting a heat exchanger which can exchange heat with an evaporator and a heat exchanger on the use side sequentially, a means of providing a gas-liquid separator on the outlet side of the heat exchanger on the use side, etc. CONSTITUTION:Cold heat carrying equipment carries cold heat of a refrigerating cycle on the heat source side comprising a compressor 1, a condenser 2, a throttle 3 and an evaporator 4, to a heat exchanger 12 on the use side. In this case, a heat exchanger 19 which can exchange heat with the evaporator 4, a liquid refrigerant tank 16, a liquid refrigerant pump 11 and the heat exchanger 12 on the use side are connected in this sequence so that a closed cycle be constructed. Besides, a gas-liquid separator 14 is provided on the outlet side of the heat exchanger 12 on the use side, while a circuit 18 for returning a liquid refrigerant separated by the separator to the liquid refrigerant tank 16 is provided. Moreover, the outlet of the liquid refrigerant pump 11 and that of the heat exchanger 19 are connected through the intermediary of a flow control valve 121. According to this constitution, no water is used as a heating medium and simplification of piping work, reduction of initial cost, elimination of damage due to leakage of water, etc., are attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold heat transfer device for transferring a cold heat source generated in a refrigerating device as a refrigerant.

[0002]

2. Description of the Related Art FIG. 6 is a system diagram of a conventional cold heat transfer device. In the figure, 1 is a compressor, 2 is a condenser, 3 is a throttle,
4 is an evaporator, 5 is a cooling water pipe, 21 is a water pump, 26 is a heat exchanger capable of exchanging heat with the evaporator 4, 22 is a use side heat exchanger, 24 is a water supply pipe line, and 25 is a return pipe. Numeral 23 indicates a fan assembly. In this system, reference numerals 21, 22,
The parts denoted by 23, 24, 25, and 26 constitute a cold heat transfer device.

The high-pressure, high-temperature gas compressed by the compressor 1 radiates heat to the cooling water in the cooling-water pipe 5 in the condenser 2, becomes a high-pressure liquid, enters the evaporator 4 through the throttle 3, and enters the evaporator 4. At this time, heat is exchanged with cold water having a relatively high temperature in the heat exchanger 26 connected to the water return pipe line 25, and after evaporating, it returns to the compressor 1. On the other hand, in the heat exchanger 26 capable of exchanging heat with the evaporator 4, the cold water in the supply pipeline 24, which has undergone heat exchange, is heat-exchanged with room air in the use-side heat exchanger 22, becomes high temperature, and becomes hot in the water pump 21. By the function, it is circulated and cooled in the heat exchanger 26 capable of exchanging heat with the evaporator 4.

[0004]

In the conventional cold heat transfer device, since water is used as the heat medium for supplying the cold heat source to the use side heat exchanger 22, the refrigerant (R-22 or the like) is used as the medium.
Compared to a direct expansion package air conditioner that uses, there are drawbacks in piping work including freeze prevention measures in winter, increase in initial cost such as increase in pipe diameter to reduce water pressure loss, maintenance, water leakage, etc. there were.

The present invention solves the above-mentioned drawbacks of the prior art, provides a cold heat transfer device that does not use water as a heat medium, facilitates piping work, reduces initial cost, facilitates maintenance, and eliminates water leakage damage. It is intended to try.

[0006]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems, and conveys cold heat of a heat source side refrigeration cycle including a compressor, a condenser, a throttle and an evaporator to a utilization side heat exchanger. In the cold heat transfer device, a heat exchanger capable of exchanging heat with the evaporator, a liquid refrigerant tank, a liquid refrigerant pump, and a use side heat exchanger are connected in this order to form a closed cycle. A gas-liquid separator is provided on the outlet side, and a circuit for returning the liquid refrigerant separated by the gas-liquid separator to the liquid refrigerant tank is provided.Furthermore, the refrigerant flow rate is adjusted between the liquid refrigerant pump outlet and the use side heat exchanger outlet. It is characterized by being connected via a valve.

[0007]

In the present invention, since the above means is provided,
The refrigerant is in a gas state in the refrigerant return pipe of the cold heat transfer device, and this refrigerant exchanges heat with the low temperature refrigerant of the evaporator in the heat exchanger capable of exchanging heat with the evaporator of the refrigeration device. Is
It becomes liquid refrigerant and is stored in the liquid refrigerant tank. After that, by the refrigerant liquid pump, the refrigerant flows through the refrigerant supply pipe into the utilization side heat exchanger to exchange heat with the load side indoor air, the room air is cooled, and the cold air is sent to the room. On the other hand, the heat-exchanged refrigerant is normally in a gas state, and is recirculated from the gas-liquid separator through the refrigerant return pipe to the heat exchanger capable of exchanging heat with the evaporator. Also, when the refrigerant liquid pump is started, there may be no liquid in the liquid refrigerant tank and gas refrigerant may have accumulated, so for a few minutes after the refrigerant liquid pump is started, the refrigerant flow rate control valve is fully opened to turn off the gas refrigerant. By returning to the gas-liquid separator, it is possible to prevent gas from being caught in the refrigerant liquid pump.

[0008]

1 is a system diagram of a cold heat transfer apparatus according to an embodiment of the present invention. In the figure, 1 is a compressor, 2 is a condenser, 3 is a throttle, 4 is an evaporator, 5 is a cooling water pipe, 11 is a refrigerant liquid pump, 12 is a heat exchanger on the use side, 13 is a fan assembly, and 14 is a gas. Liquid separator, 15 liquid return pipe, 16 liquid refrigerant tank, 17 refrigerant supply pipe, 18 refrigerant return pipe, 20 refrigerant bypass pipe, 121 refrigerant flow control valve, 122 room temperature sensor, 123 refrigerant flow rate It is a controller. In this system, reference numerals 11, 12, 13, 14, 15, 16, 1
7, 18, 19, 20, 121, 122, and 123
A cold heat transfer device is configured by the portions marked with.

The refrigerant compressed by the compressor 1 becomes a high-pressure, high-temperature gas, is cooled by the cooling water flowing through the cooling water pipe 5 in the condenser 2, becomes a high-pressure liquid refrigerant, and becomes a low-pressure two-phase refrigerant by the throttle 3. , Endothermic in the evaporator 4, and becomes a gas refrigerant. On the other hand, the gas refrigerant flowing from the refrigerant return pipe 18 of the cold heat transfer device into the heat exchanger 19 capable of exchanging heat with the evaporator 4 radiates heat to the low temperature refrigerant in the evaporator 4 and is liquefied and stored in the liquid refrigerant tank 16. To be done. The liquid refrigerant discharged by the refrigerant liquid pump 11 absorbs heat from the air in the utilization side heat exchanger 12 via the refrigerant supply pipe 17, enters the gas-liquid separator 14, and the liquid passes through the liquid return pipe 15 to the liquid refrigerant tank 16. enter. The gas refrigerant enters the heat exchanger 19 via the refrigerant return pipe 18.

When the refrigerant liquid pump 11 is started, the liquid tank 1
There is a case where there is no liquid in 6 and gas refrigerant is accumulated, so the refrigerant flow rate control valve 121 is fully opened for several minutes after the refrigerant liquid pump 11 is started, and the gas refrigerant is passed through the refrigerant bypass pipe 20.
After that, the gas is returned to the gas-liquid separator 14 to prevent gas entrapment in the refrigerant liquid pump 11. Further, the opening degree of the refrigerant flow rate control valve 121 is adjusted according to the difference between the room temperature set value and the detection value of the room temperature sensor 122, and the liquid refrigerant from the refrigerant liquid pump 11 is passed through the refrigerant flow rate control valve 121 and separated into a gas-liquid separator. By bypassing to 14, the amount of the liquid refrigerant flowing to the use side heat exchanger 12 is made appropriate.

FIG. 2 shows the refrigerant flow control valve 121 of the above embodiment.
FIG. 3 is a block diagram of a refrigerant flow rate controller 123 that determines the opening degree of. 122 is a room temperature sensor, 30 is a bridge, and 31 is an amplifier. In the figure, the difference voltage E between the detected value of the room temperature sensor 122 and the room temperature set value Ts causes the bridge 30 to output the deviation voltage E as shown in FIG. 3, which is amplified by the amplifier 31 to output the DC voltage. Thereby, the opening degree of the refrigerant flow rate control valve 121 is adjusted. When the deviation voltage E is large, a large DC voltage is output, which causes the valve 121 to move toward closing. FIG. 4 is a relationship diagram of the valve opening of the refrigerant flow control valve 121 and the bypass amount ΔQ passing through the valve with respect to the temperature difference ΔT. When the temperature difference is large, the valve is closed.
Bypass amount becomes smaller. However, during a few minutes when the liquid pump 11 is started, the minimum deviation voltage E is output without depending on the above figures, and the refrigerant flow rate control valve is fully opened at this time.

FIG. 5 is an electrical wiring diagram of the above embodiment. S
Is an operation switch, 1a is an electromagnetic contactor of the compressor 1, 1a-
1 is the contact, 11a is the electromagnetic contactor of the refrigerant liquid pump 11, 11a-1 is its contact, 13a is the electromagnetic contactor of the motor of the fan assembly 13, T is a timer and t is its contact. When the operation switch S is turned on, the electromagnetic contactor 1 of the compressor 1
a is excited and its contact 1a-1 is closed, and a few seconds later, the timer T is excited and its contact t is closed, and the electromagnetic contactor 11a of the refrigerant liquid pump 11 and the electromagnetic contactor 13a of the motor of the fan assembly 13 are closed. Are excited and their contact points 11a-
1 is closed and the cold heat transfer device is operated.

In the present embodiment, a refrigerant (R) is used as a heat carrier medium for carrying the cold heat produced by a chiller, a turbo refrigerator, an absorption refrigerator, etc., which has conventionally been air-conditioned with water as a medium, into the room.
-22) is used, there is no need for water piping work, and there is no fear of damage such as water leakage in a room where OA equipment is used. In addition, by arranging the liquid tank, the front of the liquid pump is always sealed with liquid, and the refrigerant flow rate control valve is fully opened for several minutes when the refrigerant liquid pump is started, so degassing can be performed and no trouble of the liquid pump occurs. . Further, for a constant discharge amount of the refrigerant liquid pump, a constant amount of the liquid refrigerant is bypassed by the refrigerant flow control valve, and a proper amount of the refrigerant is sent to the utilization side heat exchanger, so that high performance can be achieved.

[0014]

In the cold heat transfer apparatus of the present invention, the evaporator and the heat exchanger capable of exchanging heat, the liquid refrigerant tank, the liquid refrigerant pump, and the utilization side heat exchanger are connected in this order to form a closed cycle. , A gas-liquid separator is provided on the outlet side of the use-side heat exchanger, and a circuit for returning the liquid refrigerant separated by the gas-liquid separator to the liquid-refrigerant tank is provided. Since it is connected to the outlet of the unit via a refrigerant flow rate control valve and water is not used as a heat medium, it is possible to facilitate piping work, reduce initial costs, facilitate maintenance, and eliminate water leakage damage. it can.

[Brief description of drawings]

FIG. 1 is a system diagram of a cold heat transfer apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of a refrigerant flow rate controller of the above embodiment.

FIG. 3 is a relationship diagram of the deviation voltage with respect to the difference between the room temperature detected value and the room temperature set value in the above embodiment.

FIG. 4 is a relationship diagram of a valve opening degree and a bypass amount of a refrigerant flow rate control valve with respect to a difference between a room temperature detected value and a room temperature set value in the above embodiment.

FIG. 5 is an electrical wiring diagram of the above embodiment.

FIG. 6 is a system diagram of a conventional cold heat transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Throttle 4 Evaporator 5 Cooling water piping 11 Refrigerant liquid pump 12 User side heat exchanger 13 Fan assembly 14 Gas-liquid separator 15 Liquid return pipe 16 Liquid tank 17 Refrigerant supply pipe 18 Refrigerant return pipe 19 Evaporation Exchanger 4 capable of exchanging heat with the reactor 20 Refrigerant bypass pipe 121 Refrigerant flow rate control valve 122 Room temperature sensor 123 Refrigerant flow rate controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Chio Shiramatsu 3-chome, Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Air-conditioner factory (72) Inventor Toshihiko Yamanaka Iwatsuka-cho, Nakamura-ku, Nagoya The first highway in the letter Mitsubishi Heavy Industries, Ltd. Nagoya Research Institute (72) The inventor Takeshi Ito Iwatsuka-cho, Nakamura-ku, Nagoya The first highway in the Nagoya Institute Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] 1. A cold heat transfer device for transferring cold heat of a heat source side refrigeration cycle, which comprises a compressor, a condenser, a throttle, and an evaporator, to a heat exchanger on the use side, and a heat exchanger capable of exchanging heat with the evaporator. , A liquid refrigerant tank, a liquid refrigerant pump, and a use side heat exchanger are connected in this order to form a closed cycle, and a gas liquid separator is provided at the outlet side of the use side heat exchanger and A cold heat transfer device, characterized in that a circuit for returning the separated liquid refrigerant to the liquid refrigerant tank is provided, and the liquid refrigerant pump outlet and the utilization side heat exchanger outlet are connected via a refrigerant flow rate control valve.