JPH0476334A - Cooling device and cooling/heating device - Google Patents

Abstract

PURPOSE:To provide a substantial improvement of a condensing efficiency in a condensor by a method wherein a gas-liquid-separator is disposed in the second pipe passage and this gas-liquid-separator is comprised of a tank main body, a drain pipe passage and a control means for controlling a degree of opening of a control valve. CONSTITUTION:In a cooling device, when a liquid pump 31 is operated, refrigerant within a liquid accepting tank 21 flows into an evaporator 23 through the first pipe passage 29, where it receives an evaporating action and cools indoor air. The refrigerant passes through the second pipe passage 33 and flows into a condensor 25 and it receives a condensing action. After this operation, it passes through the third pipe passage 35 and is circulated within the liquid receiving tank 21. At a cooling/heating device, the cooling operation is carried out with the indoor evaporator also acting as a condensor 1 being used as an evaporator and the operation is similarly carried out. In turn, the heating operation is carried out in such a way as the refrigerant in the liquid accepting tank 21 is flowed into an evaporator 53 through the fourth pipe passage 57 under an operation of a liquid pump 31, the evaporated refrigerant is flowed into the indoor evaporator also acting as a condensor 51 through the fifth pipe passage 61, where it receives a condensing action and the refrigerant that heated the indoor air after receiving the condensing action is circulated within the liquid receiving tank 21 through the sixth pipe passage 65.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cooling device and a heating and cooling device, and in particular,
The present invention relates to a cooling device and an air-conditioning device using a refrigerant that changes gas-liquid phase.

[Conventional technology]

BACKGROUND ART Conventionally, as a heating and cooling apparatus using a refrigerant that undergoes a gas-liquid phase change, such as a fluorocarbon-based refrigerant, there is known, for example, the one disclosed in Japanese Patent Laid-Open No. 2-57835, which was previously filed by the present applicant.

FIG. 3 shows the air conditioning system disclosed in this publication. It is configured by disposing at least one indoor evaporator/condenser 15 that exchanges heat with the indoor evaporator/condenser 15, necessary piping and cooling/heating switching valves, and a liquid pump 17 that performs a heat cycle using these. , Freon-based refrigerants are used as heat transport means.

In the above-mentioned air-conditioning equipment, a fluorocarbon-based refrigerant is circulated as a heat transport means, which reduces the amount of refrigerant transported, reduces power consumption, and reduces the size of piping to save installation space. It becomes possible to save money.

In addition, conventional liquid pump systems can only perform air conditioning, but this air conditioning system has a reversible cycle, so it can be used for both cooling and heating purposes.It is also suitable for use as a DHC heat source, and can reduce indoor loads. Unbalance can also be easily controlled.

In this air-conditioning system, during cooling, the liquid pump 1
7 is activated, and the refrigerant in the liquid receiving tank 11 passes through the first pipe line 18 to the indoor evaporator/condenser 1, as shown by the thick line in the figure.
The air flows into the evaporator/condenser 1 through the second pipe line 19, where it receives the evaporative action and cools the indoor air.
3, where it is condensed and circulated through the third pipe line 20 into the liquid receiving tank 11.

[Problem to be solved by the invention]

However, in such a conventional air conditioning system, in order to improve the heat exchange efficiency of the indoor evaporator/condenser 15 during cooling, the liquid pump 17 is used to increase the heat exchange efficiency of the indoor evaporator/condenser 15.
When a large amount of liquid refrigerant is supplied to the refrigerant, a part of the liquid refrigerant flows directly into the second pipe line 19, and the refrigerant in the second pipe line 19 becomes a mixture of gas and liquid parts. If the refrigerant in this state is directly led to the condenser/evaporator 13, there is a problem in that the condensation efficiency in the condenser/evaporator 13 is extremely reduced.

The present invention solves the above-mentioned problems, and aims to provide a cooling device and an air-conditioning device that can significantly improve the condensing efficiency of a condenser compared to the conventional one.

[Means to solve the problem]

The cooling device according to the present invention includes a liquid receiver that stores a refrigerant in a liquid state that undergoes a gas-liquid phase change, an evaporator that exchanges heat between the refrigerant and indoor air, and a heat exchanger that exchanges heat between the refrigerant and an external cold source. a first condenser to be replaced; and a first condenser that connects the outlet side of the liquid receiving tank and the example of the evaporator and is equipped with a liquid pump.
a pipe line, a second pipe line connecting the other side of the evaporator and one side of the condenser, and a third pipe line connecting the other side of the condenser and the inlet side of the liquid receiving tank. In the cooling system equipped with
A gas-liquid separator is disposed in the second pipe line to separate gas and liquid in the second pipe line and guide only the gas content to the condenser, and this gas-liquid separator is connected to the liquid receiving liquid. a tank body disposed above the tank, in which a pair of divided ends of the second pipe line are opened to an upper gas part; a gas part in a lower part of the tank body and in an upper part of the liquid receiving tank; a drain pipe connecting the drain pipe, a control valve disposed in the drain pipe,
A liquid level sensor that measures the liquid level of the refrigerant in the tank body, and a liquid level signal from this liquid level sensor is input, and the control valve controls the liquid level to a predetermined value based on this value. and a control means for controlling the opening degree of the opening.

The air conditioning system of the present invention includes a liquid receiving tank that stores a refrigerant that undergoes a gas-liquid phase change in a liquid state, an evaporator that exchanges heat between the refrigerant and indoor air, and an external cooling source that exchanges heat with the refrigerant. a first conduit connecting the outlet side of the liquid receiving tank and one side of the evaporator and having a liquid pump interposed therein; and a third pipe line that connects the other side of the condenser and the inlet side of the liquid receiving tank, in which the second pipe line has a third pipe line connected to the liquid receiving tank. A gas-liquid separator that separates the gas and liquid in the two pipes and guides only the gas to the condenser is installed, and this gas-liquid separator is placed above the liquid receiving tank and separated. a tank body in which the pair of divided ends of the second pipe line are opened to the upper gas part; a drain pipe connecting the lower part of the tank body and the gas part in the upper part of the liquid receiving tank; A control valve arranged in this drain pipe, a liquid level sensor that measures the liquid level of the refrigerant in the tank body, and a liquid level signal from this liquid level sensor are input, and the liquid level is adjusted based on this value. and control means for controlling the opening degree of the control valve to a predetermined value.

[For production]

In the air-conditioning device and the air-conditioning/heating device of the present invention, during cooling, the refrigerant in the liquid receiving tank flows into the evaporator through the first pipe, where it receives the evaporation action and cools the indoor air;
It enters the condenser through the second line, where it is subjected to condensation action, and is then circulated through the third line into the receiving tank.

In the present invention, the gas-liquid separator disposed in the second pipe separates the gas and liquid in the second pipe, and only the gas is guided to the condenser.

That is, the refrigerant containing gas and liquid in the second pipe flows out from the divided end on the evaporator side to the upper part of the tank body, and only the light gas component flows out from the divided end on the condenser side. It is led from the part to the condenser and condensed in the condenser.

On the other hand, the liquid that has flowed into the tank body is guided from the lower part of the tank body to the liquid receiving tank through the drain pipe by opening the control valve by the control means.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of the present invention will be described with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of the cooling device of the present invention.
In the figure, the reference numeral 21 indicates a liquid receiving tank that stores a refrigerant that undergoes a gas-liquid phase change, such as a fluorocarbon refrigerant, in a liquid state.

Reference numeral 23 indicates a plurality of evaporators (only one is shown) that exchange heat between the refrigerant and indoor air.

Reference numeral 25 indicates a condenser for exchanging heat between the refrigerant and a cold source from the outside, and a cold source supply pipe 27 for supplying a cold source such as cold water from the outside is inserted through the condenser 25. ing.

A first pipe line 29 is formed by connecting the outlet side of the liquid receiving tank 21 and one side of the evaporator 23, and a liquid pump 31 is arranged in this first pipe line 29.

Further, a second pipe line 33 is formed by connecting the other side of the evaporator 23 and one side of the condenser 25.

Furthermore, a third pipe line 35 is formed by connecting the other side of the condenser 25 and the inlet side of the liquid receiving tank 21.

In this embodiment, a gas-liquid separator 37 is arranged in the second pipe line 33 to separate the gas and liquid parts in the second pipe line 33 and guide only the gas part to the condenser 25. There is.

This gas-liquid separation device 37 has a tank body 39 disposed above the liquid receiving tank 21 .

A pair of divided ends 41 and 43 of the divided second pipe line 33 are opened in the upper gas section of the tank body 39.

A drain pipe line 45 is arranged to connect the lower part of the tank body 39 and the upper gas section of the liquid receiving tank 21, and a control valve 47 is arranged in this drain pipe line 45.

On the other hand, a liquid level gauge 48 is arranged on the side of the tank body 390 at the same level as the tank body 39, and this liquid level gauge 48 has a liquid level gauge 48 that outputs the liquid level of the refrigerant in the tank body 39. A sensor 49 is arranged.

In addition, in the figure, reference numeral 50 inputs a liquid level signal from the liquid level sensor 49, and based on this value, controls the opening degree of the control valve 47 so that the liquid level becomes a predetermined, for example, constant value. The control device that controls the is shown.

In the cooling device configured as described above, when the liquid pump 31 is operated, the refrigerant in the liquid receiving tank 21 is transferred to the first pipe line 2.
9, the air flows into the evaporator 23, where it receives an evaporative action, cools the indoor air, and flows through the second pipe line 33 to the condenser 25.
, where it is condensed, and then flows into the third pipe 3.
5 and circulates into the liquid receiving tank 21.

However, in the cooling device configured as above, the second
A gas-liquid separation device 37 is provided in the pipe 33 to separate the gas and liquid in the second pipe 33 and guide only the gas to the condenser 25.
At the same time, this gas-liquid separation device 37 is arranged above the liquid receiving tank 21, and the pair of divided ends 41 and 43 of the divided second pipe line 33 are opened to the upper gas section. A drain pipe 45 connecting the lower part of the tank main body 39 and the upper gas part of the liquid receiving tank 21, a control valve 47 disposed in the drain pipe 45, and a A liquid level sensor 49 that measures the liquid level of the refrigerant and a liquid level signal from this liquid level sensor 49 are input, and based on this value, the liquid level in the tank body 39 is controlled to a predetermined value. A control device 50 that controls the opening degree of the valve 47
Since the refrigerant containing the gas and liquid components in the second pipe line 33 flows out from the divided end portion 4 of the evaporator 23 to the upper part of the tank body 39, only the light gas component is discharged. is guided from the divided end 43 on the condenser 25 side to the condenser 25 and condensed in the condenser 25, while the liquid that has flowed into the tank body 39 is caused to open the control valve 47 by the control device 50. By this, the drain pipe line 45 is connected from the lower part of the tank body 39.
Since the refrigerant is guided to the liquid receiving tank 21 through It is possible to achieve a significant improvement over the conventional method.

FIG. 2 shows an embodiment of the air conditioning system of the present invention. In this embodiment, an indoor evaporator/condenser 51 having the functions of an evaporator and a condenser is arranged indoors. Also, an evaporator 53 is arranged outside the room to exchange heat between the refrigerant and a heat source from the outside.

A heat source supply pipe 55 for supplying a heat source such as hot water from the outside is inserted into the evaporator 53 .

A fourth pipe line 57 is formed by connecting the outlet side of the liquid receiving tank 21 and one side of the evaporator 53, and an on-off valve 59 is disposed in the fourth pipe line 57.

Further, a fifth pipe line 61 is formed by connecting the other side of the evaporator 53 and the other side of the indoor evaporator/condenser 51.

Furthermore, a sixth pipe line 65 is arranged which branches from between the on-off valve 63 of the first pipe line 29 and the indoor evaporator/condenser 51 and connects to the inlet side of the liquid receiving tank 21. An on-off valve 67 is arranged in the sixth conduit 65.

In the second pipe line 33, a gas-liquid separation device that is the same as the gas-liquid separation device 37 of the above-described embodiment is arranged.

In the air conditioning system configured as described above, cooling is performed in substantially the same manner as in the embodiment described above, using the room evaporator/condenser 51 as an evaporator.

On the other hand, for heating, the liquid pump 31 is operated to cause the refrigerant in the liquid receiving tank 21 to flow into the evaporator 53 through the fourth pipe line 57, and the refrigerant subjected to evaporation here is transferred to the fifth pipe line 61. The refrigerant that heats the indoor air is passed through the sixth pipe line 6 to flow into the indoor evaporator/condenser 51 where it undergoes a condensing action.
This is done by circulating the liquid through the liquid receiving tank 21 through the liquid receiving tank 21.

Even in the air-conditioning device configured as described above, substantially the same effect as the embodiment shown in FIG. 1 can be obtained during cooling.

[Effects of the Invention] As described above, according to the present invention, the second
A gas-liquid separator is installed that separates the gas and liquid in the pipeline and guides only the gas to the condenser.This gas-liquid separator is placed above the liquid receiving tank and A tank body in which a pair of divided ends of a second pipe are opened to an upper gas part, a drain pipe connecting a lower part of this tank main body and an upper gas part of a liquid receiving tank, and this drain pipe. A control valve placed in the channel, a liquid level sensor that measures the liquid level of the refrigerant in the tank body, and a liquid level signal from this liquid level sensor are input, and the liquid level is determined in advance based on this value. Since the refrigerant in the second pipe line includes a gas component and a liquid component,
It flows out from the divided end on the evaporator side to the top of the tank body,
Only the light gas component is led to the condenser from the divided end on the condenser side and condensed in the condenser, while the liquid component that has flowed into the tank body is controlled by opening the control valve by the control means. Since the refrigerant is led from the bottom of the tank body through the drain pipe to the liquid receiving tank, the refrigerant supplied to the condenser does not contain liquid refrigerant that reduces heat exchange efficiency and does not require condensation. There is an advantage that the condensation efficiency in the container can be significantly improved compared to the conventional method.

[Brief explanation of drawings]

FIG. 1 is a piping system diagram showing an embodiment of the cooling device of the present invention. FIG. 2 is a piping system diagram showing an embodiment of the air conditioning system of the present invention. FIG. 3 is a piping system diagram showing a conventional heating and cooling system. [Explanation of symbols of main parts] 21...Liquid receiving tank 23...Evaporator 25...Condenser 29...First pipe line 31...Liquid pump 33...Second pipe line 35... Third pipe line 39... Tank body 41.43... Divided end portion 45... Drain pipe line 47... Control valve 49... Liquid level sensor 50... Control device . Figure 1

Claims (2)

[Claims] (1) A liquid receiving tank that stores a refrigerant that changes gas-liquid phase in a liquid state, an evaporator that exchanges heat between the refrigerant and indoor air, and a condenser that exchanges heat between the refrigerant and an external cold source. , a first pipe line connecting the outlet side of the liquid receiving tank and one side of the evaporator and having a liquid pump interposed therein; and a first pipe line connecting the other side of the evaporator and one side of the condenser. In the cooling device comprising two pipes and a third pipe connecting the other side of the condenser and the inlet side of the liquid receiving tank, the second pipe is connected to the gas in the second pipe. A gas-liquid separator is disposed that separates the gas from the liquid and leads only the gas to the condenser, and this gas-liquid separator is disposed above the liquid receiving tank and connected to the separated second pipe A tank body with a pair of divided ends opening into the upper gas section, a drain pipe connecting the lower part of the tank main body and the upper gas part of the liquid receiving tank, and a drain pipe arranged in the drain pipe. A control valve, a liquid level sensor that measures the liquid level of the refrigerant in the tank body, and a liquid level signal from this liquid level sensor are input, and the liquid level is adjusted to a predetermined value based on this value. and a control means for controlling the opening degree of the control valve. (2) A liquid receiving tank that stores a refrigerant that changes in gas-liquid phase in a liquid state, an evaporator that exchanges heat between the refrigerant and indoor air, and a condenser that exchanges heat between the refrigerant and an external cold source. , a first pipe line connecting the outlet side of the liquid receiving tank and one side of the evaporator and having a liquid pump interposed therein; and a first pipe line connecting the other side of the evaporator and one side of the condenser. In the air conditioning system, the air conditioning system has a cooling circuit including two pipes and a third pipe connecting the other side of the condenser and the inlet side of the liquid receiving tank. A gas-liquid separator is disposed that separates the gas component from the liquid component and guides only the gas component to the condenser, and the gas-liquid separator is disposed above the liquid receiving tank and A tank main body in which a pair of divided ends of two pipes are opened to an upper gas section, a drain pipe connecting a lower part of this tank main body and an upper gas section of a liquid receiving tank, and this drain pipe. A control valve disposed in the tank body, a liquid level sensor that measures the liquid level of the refrigerant in the tank body, and a liquid level signal from this liquid level sensor is input, and the liquid level is determined in advance based on this value. and a control means for controlling the opening degree of the control valve so that the opening degree of the control valve is adjusted to a certain value.