JPH0486433A - Cooling device and cooling/heating device - Google Patents

Abstract

PURPOSE:To enhance the condensing efficiency of a condenser by a method wherein a part of a drain pipe passage of a main body of a tank of a gasliquid- separator device is projected upwardly up to a maximum liquid level surface of refrigerant within a main body of the tank so as to form a liquid level adjusting part. CONSTITUTION:A gas-liquid separator device 37 has a main body 39 of a tank disposed above a liquid receiving tank 21. A pair of separated ends 41 and 43 are opened at an upper gaseous part 38 in the main body 39 of the tank. A lower opening of the main body 39 of the tank and the upper gaseous part 49 are connected and a drain pipe passage 45 is disposed. A part of the drain pipe passage 45 is projected upwardly up to a maximum liquid level surface L of refrigerant within the main body 39 of the tank and then a liquid level adjusting part 47 is formed. With such an arrangement, only light gaseous substance is fed from the separated end 43 at the condenser 25 toward the condenser 25, condensed at the condenser 25 and in turn refrigerant to be supplied to the condenser 25 does not contain any liquid refrigerant, but it is possible to improve a condensing efficiency of the condenser 25.

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 composed of an indoor evaporator/condenser 15 of at least one size or more, which 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, while conventional liquid pump systems can only perform cooling, this air-conditioning system has a reversible cycle, so it can be used for both cooling and heating purposes, and is also suitable for use as a DHC heat source. It is also possible to easily control the imbalance.

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 13 through the second pipe line 19, where it receives the evaporative action and cools the indoor air.
The liquid flows into the liquid receiving tank 11, undergoes a condensation action there, and circulates 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 for Solving the Problems] A cooling device according to 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; a condenser that exchanges heat between the liquid receiving tank and a cold source from the outside; a first liquid pump that connects the outlet side of the liquid receiving tank and one side 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 device 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 section; a lower opening of the tank body and an upper gas section of the liquid receiving tank; and a drain pipe connecting the refrigerant, and a part of the drain pipe protrudes upward to the maximum liquid level of the refrigerant in the tank body to form a liquid level adjustment part. be.

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 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 an example of the condenser connecting the other side of the evaporator with In the air-conditioning device, the cooling/heating system has a cooling circuit including a second conduit connecting the condenser, and a third conduit connecting the other side of the condenser and the inlet side of the liquid receiving tank. A gas-liquid separator that separates gas and liquid in the pipe line and guides only the gas to the condenser is disposed, and this gas-liquid separator is disposed 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, and a drain pipe connecting the lower opening of the tank body and the upper gas part of the liquid receiving tank. A part of the drain pipe is protruded upward to the maximum liquid level of the refrigerant in the tank body to form a liquid level adjustment part.

(Function) In the cooling device and air conditioning device of the present invention, during cooling, the refrigerant in the liquid receiving tank flows into the evaporator through the first pipe, where it undergoes an evaporative action and absorbs indoor air. Air conditioned,
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, when the liquid that has flowed into the tank body exceeds a predetermined liquid level, the refrigerant is guided to the liquid receiving tank side beyond a liquid level adjustment part formed in the drain pipe.

〔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 38 of the tank body 39.

A drain pipe 45 is arranged to connect the lower opening of the tank body 39 and the upper gas section 49 of the liquid receiving tank 21 .

A part of this drain pipe 45 is connected to the tank body 39.
It is projected upward to the maximum liquid level of the refrigerant inside.
A liquid level adjustment section 47 is formed.

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. It consists of a tank body 39 and a drain pipe 45 that connects the lower opening of the tank body 39 and the upper gas section 49 of the liquid receiving tank 21. Since the liquid level adjustment part 47 is formed to protrude upward to the maximum liquid level of the refrigerant, the second pipe line 33
The refrigerant containing gas and liquid in the tank is discharged from the divided end 41 of the 23 evaporators to the upper part of the tank body 39, and only the light gas is discharged from the divided end 43 of the 25 condensers. The refrigerant is led to the condenser 25 and condensed in the condenser 25. On the other hand, when the liquid that has flowed into the tank body 39 exceeds a predetermined liquid level, the refrigerant flows into the drain pipe. Since the refrigerant is guided to the liquid receiving tank 21 side beyond the liquid level adjustment part 47 formed in the passage 45, the refrigerant supplied to the condenser 25 contains liquid refrigerant that does not require condensation and reduces heat exchange efficiency. Therefore, the condensation efficiency in the condenser 25 can be significantly improved compared to the conventional case.

Further, in the cooling device configured as described above, a part of the drain pipe 45 is formed to protrude upward to the maximum liquid level of the refrigerant in the tank body 39 to form the liquid level adjustment part 47. It becomes possible to easily and reliably adjust the liquid level without requiring any special equipment such as a control valve or sensor.

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 an example 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 using the indoor evaporator/condenser 51 as an evaporator in substantially the same manner as in the embodiment described above.

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 heated the indoor air is flowed into the indoor evaporator/condenser 51 where it is condensed.
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.

〔Effect 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 It consists of a tank main body in which a pair of divided ends of the second pipe are opened to the upper gas section, and a drain pipe connecting the lower opening of the tank main body and the upper gas section of the liquid receiving tank. ,
A part of this drain pipe was formed to protrude upward to the maximum liquid level of the refrigerant in the tank body to form a liquid level adjustment part, so that the liquid level contained in the second pipe was contained. The refrigerant flows out from the divided end on the evaporator side to the upper part of the tank body, and only the light gas component is led to the condenser from the divided end on the condenser side and is condensed in the condenser. When the liquid that has flowed into the tank exceeds a predetermined level, the refrigerant is guided to the liquid receiving tank beyond the liquid level adjustment part formed in the drain pipe, so that the refrigerant supplied to the condenser is This has the advantage that it does not contain a liquid refrigerant that reduces heat exchange efficiency and does not require condensation, and the condensation efficiency in the condenser 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 38.49...Gas section 39...Tank body 41.43...Divided end portion 45...Drain pipe line 47...Liquid level adjustment part. Figure 1 Figure 3

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 It consists of a tank body with a pair of divided ends opening into the upper gas section, and a drain pipe connecting the lower opening of the tank main body and the upper gas part of the liquid receiving tank. A cooling device characterized in that a part of the tank body is formed by protruding upward to a maximum liquid level of the refrigerant in the tank body to form a liquid level adjustment part. (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 Consisting of a tank body in which a pair of divided ends of two pipes are opened to the upper gas part, and a drain pipe connecting the lower opening of the tank body and the upper gas part of the liquid receiving tank, A heating and cooling device characterized in that a part of the drain pipe is protruded upward to a maximum liquid level of the refrigerant in the tank body to form a liquid level adjustment part.