JPH0486428A - Cooling/heating device - Google Patents

Abstract

PURPOSE:To miniaturize a liquid pump by installing a first pipeline where the liquid pump is installed, a third pipeline where a condenser is laid out above a liquid receiving tank, a second pipeline, a fifth pipeline, and a sixth pipeline connected with the liquid receiving tank, an indoor vapolizer/condenser, and a vaporizer. CONSTITUTION:During cooling operation, the refrigerant in a liquid receiving tank 21 flows through a first pipeline 29 and cools the interior of a room by an indoor vaporizer/condenser 23, and enters spontaneously the tank 21, passing through a second pipeline 37. The refrigerant gas portion passes through a third pipeline 39 and it is condensed and drops into the tank 21 by gravity. During operation, the refrigerant in the tank 21 passes through a fourth pipeline 41 and enters a vaporizer 26 and enters an indoor condenser 23, passing through a fifth pipeline 45 where the room is heated. Then, the refrigerant enters the tank 21, passing through a sixth pipeline 47. At that time, the refrigerant drops into the tank 21 from the third pipeline 39 by gravity where the internal pressure in the tank 21 reduced. The refrigerant in the sixth pipeline 47 is sucked up into the tank, which can miniaturize the liquid pump 31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an air conditioning system, and more particularly to an air conditioning system using a refrigerant that undergoes a gas-liquid phase change.

[Prior Art] Conventionally, as a heating and cooling device using a refrigerant that changes gas-liquid phase, such as a fluorocarbon-based refrigerant, there is one disclosed in Japanese Patent Laid-Open No. 2-57835, which was previously filed by the present applicant. Are known.

FIG. 7 shows the air-conditioning system disclosed in this publication. It is constructed by disposing a small number of indoor evaporator/condensers 15 (more than one), necessary piping and cooling/heating switching valves, and a liquid pump 17 that performs a heat cycle by these. Furthermore, fluorocarbon-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 heating, the liquid pump 1
7 is activated, the refrigerant in the liquid receiving tank 11 flows into the condenser/evaporator 13 through the first pipe line 18, as shown by the bold line in the figure, where it is subjected to evaporation action, and then transferred to the second pipe line. The liquid flows into the indoor evaporator/condenser 15 through 19, where it undergoes a condensing action to heat the indoor air, and then circulates into the liquid receiving tank 11 through the sixth pipe line 20. .

(Problems to be Solved by the Invention) However, in such a conventional air conditioning system, the refrigerant is forcedly circulated by the operation of the liquid pump 17.
Relatively large liquid pump 17 with sufficient forced circulation capacity
The problem was that it required

In particular, an indoor evaporator/condenser 15 is installed below the liquid receiving tank 17.
is arranged, or the resistance of each pipe line 18, 19, 20 is large, and when heating using the sixth pipe line 20,
There was a possibility that the actual head would become very large, making it difficult to perform sufficient forced circulation.

The present invention solves the above-mentioned problems, and aims to provide a heating and cooling device that can reliably circulate a refrigerant using a relatively small liquid pump.

[Means to solve the problem]

A heating and cooling device according to a first aspect of the present invention includes: a liquid receiving tank that stores a refrigerant in a liquid state that undergoes a gas-liquid phase change; an indoor evaporator/condenser that exchanges heat between the refrigerant and indoor air; a condenser that exchanges heat with a cold source; an evaporator that exchanges heat between the refrigerant and an external heat source during heating; and an example of the indoor evaporator and condenser on the outlet side of the liquid receiving tank. a first pipe line connected to the liquid pump, a second pipe line connecting the other side of the room evaporator/condenser and the inlet side of the liquid receiving tank; and an upper part of the liquid receiving tank. An example of a third pipe line in which one end and the other end are communicated with a gas section formed in a gas section and the condenser is disposed above the liquid receiving tank, and an outlet side of the liquid receiving tank and the evaporator. The fourth connecting
a pipe line, a fifth pipe line connecting the other side of the evaporator and the other side of the indoor evaporator/condenser, an example of the indoor evaporator/condenser, and an inlet side of the liquid receiving tank; and a sixth conduit connecting the two.

The air conditioning system according to claim 2 is the air conditioning system according to claim 1, in which the indoor evaporator and condenser is disposed below the liquid receiving tank, the liquid pump in the first pipe is bypassed, and an on-off valve is provided. The system is equipped with a bypass pipe.

[For production]

In the invention of claim 1, during cooling, the refrigerant in the liquid receiving tank flows into the indoor evaporator/condenser through the first pipe, where it receives the evaporation action and cools the indoor air. , is circulated into the receiving tank through the second conduit. Then, the gas portion of the refrigerant that has flowed into the gas section of the liquid receiving tank passes through one end of the third pipe, is condensed in the condenser, and is naturally transferred from the other end of the third pipe to the liquid storage part of the liquid receiving tank. It will fall.

On the other hand, during heating, the refrigerant in the liquid receiving tank flows into the evaporator through the fourth pipe, receives the evaporation effect there, and flows into the indoor evaporator/condenser through the fifth pipe, Here, the condensing action heats the indoor air, which is then circulated into the liquid receiving tank through the sixth pipe.

During heating, by supplying a cold source to the condenser, the gas portion of the refrigerant that has flowed into the gas section of the liquid receiving tank from the sixth pipe passes through one end of the third pipe and is stored in the condenser. The liquid is condensed and naturally falls from the other end of the third pipe into the liquid storage part of the liquid receiving tank, and the internal pressure inside the liquid receiving tank is reduced.
The refrigerant in the pipe is drawn toward the liquid receiving tank.

In the air conditioning system according to claim 2, in claim 1, the indoor evaporator/condenser is disposed below the liquid receiving tank, the liquid pump in the first pipe is bypassed, and an on-off valve is interposed. Since a bypass pipe has been installed, during cooling, by opening the on-off valve of the bypass pipe, the refrigerant in the liquid receiving tank passes through the first pipe and the bypass pipe and naturally enters the indoor evaporator/condenser. It will definitely flow in a circulating state.

〔Example〕

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

FIG. 1 shows an embodiment of the air conditioning system of the present invention, and in the figure, reference numeral 21 indicates a liquid receiving tank that stores a refrigerant that changes gas-liquid phase, such as a fluorocarbon refrigerant, in a liquid state. ing.

Reference numeral 23 indicates a plurality of indoor evaporators/condensers (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.

Reference numeral 26 indicates an evaporator that exchanges heat between the refrigerant and an external heat source, and a heat source supply pipe 28 for supplying a heat source such as hot water from the outside is inserted through the evaporator 26. ing.

A first pipe line 29 is formed by connecting the outlet side of the liquid receiving tank 21 and an example of the indoor evaporator/condenser 23. , liquid pump 31. Open/close valve 33. A control valve 35 is arranged.

In addition, the other side of the indoor evaporator/condenser 23 and the liquid receiving tank 21
A second conduit 37 is formed by connecting the inlet side of the inlet.

Furthermore, a gas section 48 formed at the upper part of the liquid receiving tank 21
In this case, one end and the other end are communicated with this gas part 48, and a third
A conduit 39 is arranged.

A condenser 25 is disposed in the third pipe line 39 above the liquid receiving tank 21 .

A fourth pipe line 41 is formed by connecting the outlet side of the liquid receiving tank 21 and an example of the evaporator 26, and an on-off valve 43 is disposed in this fourth pipe line 41.

Further, a fifth pipe line 45 is formed by connecting the other side of the evaporator 26 and the other side of the indoor evaporator/condenser 23.

Furthermore, a sixth pipe branched from between the on-off valve 33 and the control valve 35 of the first pipe line 29 and connected to the inlet side of the liquid receiving tank 21.
A pipe line 47 is arranged, and an on-off valve 49 is arranged in this sixth pipe line 47.

A control valve 53 whose opening degree is controlled by a signal from a pressure sensor 69 disposed in the liquid receiving tank 21 is disposed in the cold source supply pipe 27 . Condensation of the refrigerant is configured to be controlled.

Further, a control valve 57 whose opening degree is controlled by a signal from a pressure sensor 51 arranged in the fifth pipe line 45 is arranged in the heat source supply pipe 28.
The evaporation of the refrigerant in the evaporator 26 is controlled.

Further, the control valve 35 disposed in the first conduit 29 is configured to have its opening degree controlled by a temperature sensor 59 disposed indoors.

Further, a differential pressure sensor 61 for measuring the differential pressure before and after the liquid pump 31 is disposed in the first conduit 29, and a liquid level sensor 63 is disposed in the fourth conduit 41. The surface sensor 63 is configured to control the operation of the liquid pump 31.

In the air conditioning system configured as described above, as shown in FIG. 2, during cooling, the cold source supply pipe 27 of the condenser 25
For example, a cold source consisting of cold water is supplied to the liquid pump 31, and the liquid pump 31 is operated.

Then, the refrigerant in the liquid receiving tank 21 flows into the indoor evaporator/condenser 23 through the first pipe line 29, where it receives the evaporation action and cools the indoor air. The liquid is circulated through the liquid receiving tank 21.

Then, the gas portion of the refrigerant that has flowed into the gas section 48 of the liquid receiving tank 21 passes through one end of the third pipe line 39, is condensed in the condenser 25, and is sent from the other end of the third pipe line 39 to the liquid receiving tank 21. The liquid will naturally fall into the liquid storage section 50.

In addition, in FIG. 2, the black-colored on-off valves each indicate a closed state, and the white on-off valves indicate an open state.

On the other hand, during heating, as shown in FIG. 3, a heat source made of, for example, hot water is supplied to the heat source supply pipe 28 of the evaporator 26, and the liquid pump 31 is operated.

Then, the refrigerant in the liquid receiving tank 21 flows into the evaporator 26 through the fourth pipe line 41, where it is gasified by the evaporation action, and passes through the fifth pipe line 45 into the indoor evaporator and condenser. The liquid flows into the container 23 where it is condensed to heat the indoor air, and then circulates into the liquid receiving tank 21 through the sixth pipe 47.

During this heating, the cold heat source supply pipe 2 of the condenser 25
7, by supplying a cold source consisting of cold water, for example, the gas portion of the refrigerant flowing from the sixth pipe line 47 into the gas section 48 of the liquid receiving tank 21 passes through one end of the third pipe line 39 and is condensed. It is condensed in the container 25 and naturally falls from the other end of the third pipe line 39 to the liquid storage part 5D of the liquid receiving tank 21, and the internal pressure of the gas part 48 in the liquid receiving tank 21 is reduced. Conduit 47
The refrigerant inside is drawn toward the liquid receiving tank 21 side.

In addition, in FIG. 3, the black-colored on-off valves each indicate a closed state, and the white on-off valves indicate an open state.

Therefore, in the air conditioning system configured as described above, a third pipe line 39 is formed, one end and the other end of which are communicated with the gas section 48 formed in the upper part of the liquid receiving tank 21. The condenser 25 is located above the liquid receiving tank 21 of 39.
, by supplying a cold source to the condenser 25 during heating, the gas portion of the refrigerant that has flowed into the gas section 48 of the liquid receiving tank 21 from the sixth pipe line 47 is transferred to one end of the third pipe line 39. , and is condensed in the condenser 25, and naturally falls from the other end of the third pipe line 39 into the liquid storage part 50 of the liquid receiving tank 21, and the internal pressure in the liquid receiving tank 21 is reduced. Conduit 4
The refrigerant in 7 is drawn toward the liquid receiving tank 21 side.

Therefore, the fourth conduit 41. Fifth conduit 45 and sixth conduit 4
The circulation of the refrigerant in 7 becomes very smooth, and it becomes possible to reliably circulate the refrigerant using the relatively small liquid pump 31.

In particular, when the indoor evaporator/condenser 23 is disposed below the liquid receiving tank 21, or when each pipe line 41,
Even when the resistance of 45.47 is large, sufficient forced circulation can be easily achieved.

Furthermore, since it is possible to reduce the capacity of the liquid pump 31, it is possible to reduce manufacturing costs and power consumption costs.

Furthermore, in the air conditioning system configured as described above, the second
It is no longer necessary to arrange the condenser 25 directly in the pipe line 37,
It becomes possible to reduce the flow resistance of the second conduit 37.

In addition, in order to improve the efficiency of the indoor evaporator/condenser 23, when an excessive amount of refrigerant liquid is supplied, the excess liquid remains in the second pipe line 37, and when this enters the condenser 25, it is condensed. Although the efficiency decreases, in the present invention, the liquid in the second pipe line 37 falls and separates in the liquid receiving tank 21, and only the gas component is supplied to the condenser 25, so the decrease in condensation efficiency is reduced. .

FIG. 4 shows another embodiment of the air conditioning system of the present invention. In this embodiment, the indoor evaporator/condenser 23 is disposed below the liquid receiving tank 21. Bypassing the liquid pump 31 of the first pipe line 29, a bypass pipe line 75 in which an on-off valve 73 is interposed is provided.

In the air-conditioning system configured as above, during cooling,
As shown in FIG. 5, the on-off valve 73 of the bypass line 75 is opened, the liquid pump 31 is stopped, and the refrigerant in the liquid receiving tank 21 is transferred from the liquid receiving tank 21 to the indoor evaporator/condenser 23.
Since it is located at the bottom, it flows through the first pipe line 29 and the bypass pipe line 75 into the indoor evaporator/condenser 23 in a natural circulation state, where it receives the evaporation action and cools the indoor air. The liquid is then circulated through the second pipe line 37 into the liquid receiving tank 21 . Then, the gas portion of the refrigerant that has flowed into the gas section of the liquid receiving tank 21 passes through one end of the third pipe line 39, is condensed in the condenser 25, and is sent from the other end of the third pipe line 39 to the liquid receiving tank 21. It will naturally fall into the liquid storage area.

On the other hand, during heating, as shown in FIG. 6, the on-off valve 73 of the bypass line 75 is closed, the liquid pump 31 is operated, and the refrigerant in the liquid receiving tank 21 passes through the fourth line 41 and evaporates. It flows into the vessel 26, where it is subjected to evaporation action, and then flows into the fifth pipe line 45.
The air flows through the indoor evaporator/condenser 23, where it receives a condensing action and heats the indoor air, and then flows into the sixth pipe 4.
7 and circulates into the liquid receiving tank 21.

Although the air-conditioning system configured as described above can achieve almost the same effect as the embodiment shown in FIG. 1,
In this embodiment, the indoor evaporator/condenser 23 is disposed below the liquid receiving tank 21, and the liquid pump 31 of the first pipe line 29 is bypassed to form a bypass pipe in which an on-off valve 73 is interposed. 75, the bypass pipe 8 is used during cooling.
By opening the on-off valve 73 of 75, the liquid receiving tank 2
Since the refrigerant in 1 reliably flows into the indoor evaporator/condenser 23 through the first pipe line 29 and the bypass pipe line 75 in a natural circulation state, the operation of the liquid pump 31 can be stopped during cooling. .

[Effects of the Invention] As described above, according to the air conditioning system of claim 1, a third pipe line is formed, one end and the other end of which are communicated with the gas section formed in the upper part of the liquid receiving tank. Since the condenser is placed above the liquid receiving tank in the third pipe line, even during heating, by supplying a cold source to the condenser, the gas flow from the sixth pipe line to the gas part of the liquid receiving tank. The gas content of the refrigerant is
It passes through one end of the pipe, is condensed in the condenser, and naturally falls from the other end of the third pipe into the liquid storage part of the liquid receiving tank, reducing the internal pressure in the liquid receiving tank. Since the refrigerant in the lines is drawn toward the liquid receiving tank, the circulation of the refrigerant in each line and the 6th line becomes extremely smooth, and the relatively small liquid pump ensures the refrigerant circulation. The advantage is that it can be done.

In the air conditioning system according to claim 2, in claim 1, the indoor evaporator/condenser is disposed below the liquid receiving tank, the liquid pump in the first pipe is bypassed, and an on-off valve is interposed. Since a bypass pipe has been installed, during cooling, by opening the on-off valve of the bypass pipe, the refrigerant in the receiving liquid passes through the first pipe and the bypass pipe and naturally flows into the indoor evaporator/condenser. Since the liquid flows in in a circulating state, there is an advantage that the operation of the liquid pump can be stopped during cooling.

[Brief explanation of drawings]

FIG. 1 is a piping system diagram showing an embodiment of the air conditioning system of the present invention. FIG. 2 is a piping system diagram showing the state of FIG. 1 during cooling. FIG. 3 is a piping system diagram showing the state of FIG. 1 during heating. FIG. 4 is a piping system diagram showing another embodiment of the air conditioning system of the present invention. FIG. 5 is a piping system diagram showing the state of FIG. 4 during cooling. FIG. 6 is a piping system diagram showing the state of FIG. 4 during heating. FIG. 7 is a piping system diagram showing a conventional heating and cooling system. [Explanation of symbols of main parts] 21...Liquid receiving tank 23...Room evaporator/condenser 25...Condenser 26...Evaporator 29...First pipe line 31... -Liquid pump 37...Second pipe line 39...Third pipe line 41...Fourth pipe line 45...Fifth pipe line 47...Sixth pipe line. Figure 31 (lump 9r Schiff"9 Figure Figure Figure Figure Figure

Claims (2)

[Claims] (1) A liquid receiving tank that stores a refrigerant that changes gas-liquid phase in a liquid state, an indoor evaporator/condenser 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 condenser for exchanging, an evaporator for exchanging heat between the refrigerant and an external heat source during heating, and a liquid pump connecting the outlet side of the liquid receiving tank and one side of the indoor evaporator/condenser. a first pipe line interposed therein, a second pipe line connecting the other side of the indoor evaporator/condenser and the inlet side of the liquid receiving tank, and a second pipe line formed in the upper part of the liquid receiving tank. A third pipe line, in which one end and the other end are communicated with the gas section and in which the condenser is disposed above the liquid receiving tank, connects the outlet side of the liquid receiving tank and one side of the evaporator. a fifth pipe line connecting the other side of the evaporator and the other side of the indoor evaporator/condenser, and one side of the indoor evaporator/condenser and the liquid receiving side. A heating and cooling device comprising: a sixth conduit connecting the inlet side of the tank. (2) The indoor evaporator/condenser is placed below the liquid receiving tank, and the liquid pump in the first pipeline is bypassed.
2. The heating and cooling system according to claim 1, further comprising a bypass pipe line in which an on-off valve is interposed.