JPH05149557A - Heat transfer device - Google Patents

Abstract

PURPOSE:To reduce the degree of overcooling of an overcooled liquid refrigerant and miniaturize a radiator, in a heat transfer device utilizing a pressure rise upon heating the refrigerant for the heat of space heating. CONSTITUTION:A refrigerant heater 2 and a gas/liquid separator 1 are connected to an annular pipeline while a liquid receiver 19 is provided above the gas/liquid separator 1 through a drop-in tube 7 having a first non-return valve 6. Further, a heat transfer unit 18, consisting of an opening and closing valve 8 and a pressure equilibrium tube 9, is connected to the annular pipeline and an annular circulating passage 20, in which the gas/liquid separator 1, the radiator 10, a second non-return valve 12, the liquid receiver 19 are connected sequentially through pipings, are provided while the liquid receiver 19 is provided with a heat insulating layer 21 on the inner surface of the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer device for utilizing heat for heating or the like by utilizing a pressure rise when heating a refrigerant.

[0002]

2. Description of the Related Art A conventional heat transfer device is disclosed in, for example, Japanese Patent Laid-Open No.
As shown in Japanese Patent Publication No. 51631, the structure is as shown in FIG.

That is, the gas-liquid separator 1 is arranged above the refrigerant heater 2 and is connected by an inlet pipe 3 of the refrigerant heater 2 and an outlet pipe 4 of the refrigerant heater 2 and connected by an annular pipe line. ing. Further, the liquid receiver 5 is arranged above the gas-liquid separator 1, is connected to the gas-liquid separator 1 by a drop pipe 7 having a first check valve 6, and is further provided with a pressure equalizing pipe 9 having an opening / closing valve 8 by an outlet pipe. It is connected to the gas-liquid separator 1 via 4. The gas-liquid separator 1 and the radiator 10 arranged on the indoor side as the use side are connected by a gas refrigerant forward pipe 11, and the radiator 10 and the liquid receiver 5 are liquid refrigerant return pipes having a second check valve 12. It is connected at 13. As described above, the gas-liquid separator 1, the radiator 10, the second check valve 12, the liquid receiver 5, and the first check valve 6 form an annular circulation path sequentially connected by piping. Reference numeral 14 is a temperature detector provided in the outlet pipe of the refrigerant heater 2, and 15 is a control device for controlling the opening / closing time of the opening / closing valve 8 according to the temperature detected by the temperature detector 14. Reference numeral 16 is a burner provided in the refrigerant heater 2, and the burner 16 heats the refrigerant. A blower 17 is provided in the radiator 10.

The operation of the above structure will be described below. In the refrigerant heater 2, the refrigerant heated by the combustion heat of the burner 16 flows into the gas-liquid separator 1 through the outlet pipe 4 in a two-phase state of gas and liquid, and the liquid refrigerant is heated again from the inlet pipe 3 by the refrigerant heating. Flows into the vessel 2. On the other hand, gas-liquid separator 1
Of the two-phase refrigerant that has flowed into the gas refrigerant, the gas refrigerant enters the radiator 10 through the gas refrigerant outflow pipe 11, exchanges heat with the indoor air sent by the blower 17, and radiates condensed liquefaction.

Here, when the on-off valve 8 is closed, the refrigerant condensed and liquefied by the radiator 10 flows from the liquid refrigerant return pipe 13 to the second side.
It flows into the liquid receiver 5 via the check valve 12. At this time, the pressure inside the liquid receiver 5 is lower than the pressure inside the gas-liquid separator 1, so the first check valve 6 is in a closed state.
When the on-off valve 8 is opened in this state, the liquid receiver 5 and the gas-liquid separator 1 communicate with each other through the pressure equalizing pipe 9 to be in a pressure equalizing state, and the liquid refrigerant in the liquid receiver 5 undergoes the first check by gravity. It flows through the valve 6 into the gas-liquid separator 1.

Next, when the open / close valve 8 is closed again, the first check valve 6 is closed, the condensed liquid refrigerant of the radiator 10 is pumped into the liquid receiver 5, and the liquid receiver 5 is closed. Repeat the cycle filled with liquid refrigerant. As described above, the natural circulation cycle between the gas-liquid separator 1 and the refrigerant heater 2 is based on the evaporated refrigerant pressure, and the supply of the liquid refrigerant from the liquid receiver 5 to the gas-liquid separator 1 and the refrigerant heater 2 is performed by the open / close valve 8 It is an intermittent operation cycle according to the open / close cycle.

[0007]

In the above conventional structure, the gas refrigerant in the liquid receiver is cooled by the supercooled liquid which is radiated and liquefied by the radiator, and the liquid refrigerant is condensed in the liquid receiver by the sudden decrease in volume. The refrigerant is sucked and the refrigerant is circulated.

By the way, this supercooled liquid needs to cool not only the gas refrigerant in the liquid receiver but also the liquid receiver itself having a heat capacity. This liquid receiver is made of a metal that is a good conductor of heat, such as copper and iron, because it satisfies the conditions such as strength and workability to withstand the evaporation pressure when the refrigerant is heated. Therefore, the amount of heat for lowering the temperature of the receiver itself is relatively large, and it is necessary to increase the degree of supercooling of the supercooled liquid refrigerant, and the radiator on the user side has a low heat transfer coefficient and undercooling with poor heat exchange efficiency. Since a large liquid area is required, the radiator becomes large, and there are problems in terms of installation and machine cost.

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and it is an object of the present invention to reduce the degree of supercooling of a supercooled liquid refrigerant and to reduce the size of a radiator.

[0010]

In order to achieve the above object, the present invention provides a liquid receiver provided above the gas-liquid separator, in which a refrigerant heater and a gas-liquid separator are connected to an annular pipe line.
The heat transfer part connected to the annular pipe line by the drop pipe having the first check valve and the pressure equalizing pipe having the opening / closing valve, the gas-liquid separator, the radiator, the second check valve, and the liquid receiver. An annular circulation path sequentially connected by piping is provided, and a heat insulating layer is provided on the inner surface of the liquid receiver.

[0011]

With the above structure, the present invention prevents the heat transfer between the gas refrigerant and the liquid receiver, and the supercooled liquid refrigerant need only have a supercooling degree equivalent to the amount of heat for cooling the gas refrigerant. Is small, and heat transfer operation by safe refrigerant heating can be performed.

By reducing the degree of supercooling, the area of the supercooled liquid having a low heat exchange capacity becomes small, so that the radiator can be miniaturized.

[0013]

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

In FIG. 1, the same reference numerals as those in FIG. 2 indicate the same members and have the same functions, and therefore detailed description thereof will be omitted.
The different points will be mainly described.

Reference numeral 18 denotes a refrigerant heater 2 having a burner 16 and a gas-liquid separator 1 connected to an annular pipe line, and a liquid receiver 19 provided above the gas-liquid separator 1 is provided with a first check valve 6. It is a heat transfer section which is connected to the annular pipe line by an inlet pipe 7 and a pressure equalizing pipe 9 having an on-off valve 8. Reference numeral 20 denotes an annular circulation path in which the gas-liquid separator 1, the radiator 10, the second check valve 12, and the liquid receiver 19 are sequentially connected by piping. 21 is a heat insulating layer provided on the inner surface of the liquid receiver 19, 22 is a combustion amount varying device for varying the combustion amount of the burner 16, 23 is the on-off valve 8, the temperature detector 14,
The control device is electrically connected to the combustion amount varying device 22.

In the above structure, the heat transfer is performed by heating the refrigerant by the opening / closing operation of the opening / closing valve 8, the combustion in the burner 16 and the operation of the blower 17.

In the above heat transfer operation, when the liquid refrigerant in the receiver 19 is dropped into the gas-liquid separator 1 by opening the on-off valve 8, the inside of the receiver 19 is filled with the gas refrigerant generated in the refrigerant heater 2. It is filled. This gas refrigerant is cooled by the supercooled liquid refrigerant that is radiated by the radiator 10 when the on-off valve 8 is closed,
Due to the condensation and liquefaction, a sudden decompression occurs in which the volume is suddenly reduced. At this time, the gas refrigerant is cooled by the supercooled liquid refrigerant, but the liquid receiver 19 itself is thermally shielded from the gas refrigerant by the heat insulating layer 21 and the opening / closing valve 8 repeats the opening / closing operation without being cut off. By cooling the gas refrigerant in a short time, the liquid receiver 19 itself is cooled by the supercooled liquid very little.

Therefore, the supercooled liquid refrigerant does not need the amount of heat for cooling the liquid receiver 19 itself, and the degree of supercooling can be reduced.

The radiator 10 is reduced by reducing the degree of supercooling.
Since the heat transfer coefficient is low and the heat exchange temperature difference is small, the heat exchange area is wide and the necessary supercooled liquid area can be greatly reduced, which can promote the downsizing of the radiator on the user side and the installation of the user side equipment. The degree of freedom is improved and the cost can be further reduced.

When the size of the radiator on the user side is not changed, the heat radiation capacity is improved by increasing the effective heat radiating portion, and the operating room temperature region is restricted by the upper limit of the refrigerant pressure with respect to the room temperature on the user side. Is expanded to the high temperature side and comfort is improved.

Further, the amount of improvement in this heat dissipation capability is taken into consideration by the blower 1
If it is directed to reducing the air flow rate of 7, the noise can be greatly reduced on the user side, and the comfort is improved.

If the heat insulating layer 21 is formed by ceramic coating or the like, workability and cost are practical.

[0023]

As described above, the heat transfer device of the present invention is
Since a heat insulating layer is provided on the inner surface of the receiver that constitutes the heat transfer unit, the supercooled liquid refrigerant cools only the gas refrigerant without cooling the receiver itself, and the degree of supercooling can be reduced. ,
This has the effect of reducing the size of the radiator and improving the installation flexibility and cost. In addition, when the radiator is used while maintaining its size, the comfort on the user side is improved by expanding the operable room temperature range to the high temperature side and reducing noise by reducing the air flow of the radiator fan. There is also an advantage.

[Brief description of drawings]

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

FIG. 2 is a system configuration diagram of a conventional heat transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas-liquid separator 2 Refrigerant heater 6 1st check valve 8 Opening / closing valve 10 Radiator 12 2nd check valve 18 Heat transfer part 19 Liquid receiver 20 Circulation path 21 Thermal insulation layer

Claims (1)

[Claims] 1. A liquid receiver provided above the gas-liquid separator, wherein the refrigerant heater and the gas-liquid separator are connected to an annular conduit.
The heat transfer part connected to the annular pipe line by the drop pipe having the first check valve and the pressure equalizing pipe having the opening / closing valve, the gas-liquid separator, the radiator, the second check valve, and the liquid receiver. A heat transfer device having an annular circulation path sequentially connected by pipes and having a heat insulating layer provided on the inner surface of the liquid receiver.