JPH0462344A - Heating device - Google Patents

Abstract

PURPOSE:To enable miniaturization of a liquid pump and to confirm compulsory liquid circulation by arranging a condenser for cooling refrigerant in a return pipe at a position upward of a liquid receiving tank of the return pipe. CONSTITUTION:In a heating device, a condenser 59 for cooling refrigerant in a return pipe 45 is arranged at a position upward of a liquid receiving tank 31 of the return pipe 45. In this arrangement, gas element in the return pipe 45 is condensed again within the condenser 59, while reducing inner pressure of the condenser 59 and liquid receiving tank 31. Thereby, the refrigerant in the return pipe 45 is attracted toward the condenser 59 side. Accordingly, circulation of the refrigerant in a first pipe 39, a second pipe 42 and the return pipe 45 becomes very smooth, whereby the refrigerant can be circulated firmly with a relatively small liquid pump 41.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heating device, and particularly relates to a heating device that changes gas-liquid phase [Prior art] Conventionally, refrigerants that change gas-liquid phase, such as fluorocarbon-based refrigerants, have been used. As an example of a heating and cooling device, one disclosed in Japanese Patent Application Laid-Open No. 1-57835, which was previously filed by the present applicant, is known.

Figure 2 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, 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.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 through the first pipe line 19 to the condenser/evaporator 13, 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 21, where it undergoes a condensing action and heats the indoor air, and then circulates into the receiving tank 11 through the return line 23.

(Problem to be Solved by the Invention) However, in such a conventional air-conditioning device, since 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, the indoor evaporator/condenser 15 is located below the liquid receiving tank 17.
is arranged, or the resistance of each pipe line 19, 21, 23 is large, and when heating using the return pipe line 23,
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 an object of the present invention is to provide a heating device that can reliably circulate a refrigerant using a relatively small liquid pump.

[Means to solve the problem]

The heating device according to the present invention includes: a liquid receiving tank that stores a refrigerant in a liquid state that undergoes a gas-liquid phase change; an evaporator that exchanges heat between the refrigerant and an external heat source; and a heating device that exchanges heat between the refrigerant and indoor air. a condenser to be replaced; 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 the other side of the evaporator and one side of the condenser. and a return pipe connecting the other side of the condenser and the inlet side of the liquid receiving tank. A condenser is arranged to cool the refrigerant in the pipe.

[Function] In the heating device of the present invention, when the liquid pump is operated, the refrigerant in the liquid receiving tank flows into the evaporator through the first pipe line, undergoes an evaporation action here, and then flows into the second pipe. The air flows into the condenser through the channel, where it undergoes a condensing action and heats the indoor air.
The liquid is circulated through the return line into the receiving tank.

In addition, in the present invention, since the condenser for cooling the refrigerant in the return conduit is arranged above the liquid receiving tank in the return conduit, the gas in the return conduit is absorbed into the condenser. recondensed,
The internal pressure in the condenser and the liquid receiving tank is reduced, which causes the refrigerant in the return line to be drawn toward the condenser.

[Example] Hereinafter, an example will be described in which details of the present invention are shown in the drawings.

FIG. 1 shows an embodiment of the heating device of the present invention.
In the figure, a symbol 31 indicates a liquid receiving tank that stores a refrigerant that changes gas-liquid phase, such as a fluorocarbon refrigerant, in a liquid state.

Reference numeral 33 indicates an evaporator for exchanging heat between the refrigerant and an external heat source, and a heat source supply pipe 35 for supplying the heat source from the outside is inserted through the evaporator 33 .

Reference numeral 37 indicates a plurality of condensers (only one is shown) that exchange heat between the refrigerant and indoor air.

A first pipe line 39 is formed by connecting the outlet side of the liquid receiving tank 31 and one side of the evaporator 33, and a liquid pump 41 is disposed in the first pipe line 39.

Further, a second pipe line 42 is formed by connecting the other side of the evaporator 33 and one side of the condenser 37.

Furthermore, a return pipe line 45 is formed by connecting the other side of the condenser 37 and the inlet side of the liquid receiving tank 31.

In this embodiment, the heat source supply pipe 35 includes a second
A control valve 49 whose opening degree is controlled by a signal from a pressure sensor 47 arranged in the pipe line 42 is arranged, and the control valve 49 is configured to control the vaporization of the refrigerant in the evaporator 33. ing.

Further, a liquid level sensor 55 is arranged on the side of the evaporator 33 in the first pipe line 39, and the operation of the liquid pump 41 is controlled by a signal from the liquid level sensor 55. ing.

Furthermore, a control valve 5 is provided near the condenser 37 in the return pipe 45.
1 is arranged, and this control valve 51 is configured so that its opening degree is controlled by a temperature sensor 53 arranged indoors.

In this embodiment, a condenser 59, which is a heat exchanger for cooling the refrigerant in the return pipe 45, is disposed above the liquid receiving tank 31 in the return pipe 45.

This condenser 59 has a cold water supply pipe 61 that supplies cold water.
A control valve 65 whose opening degree is controlled by a signal from a pressure sensor 63 disposed in the liquid receiving tank 31 is disposed in the cold water supply pipe 61 .

In the heating device configured as described above, the liquid receiving tank 31
The refrigerant inside is transferred to the first pipe line 39 by the operation of the liquid pump 41.
The air flows into the evaporator 33 through the evaporator 33, where it is evaporated, flows into the condenser 37 through the second pipe 42, where it receives the condensation action, heats the indoor air, and then returns. Conduit 45
The liquid is circulated through the liquid receiving tank 31.

Therefore, in the heating device configured as described above, since the condenser 59 for cooling the refrigerant in the return pipe 45 is disposed above the liquid receiving tank 31 in the return pipe 45,
The gas in the return pipe 45 is recondensed in the condenser 59,
The internal pressures in the liquid condenser 59 and the liquid receiving tank 31 are reduced, and as a result, the refrigerant in the return pipe 45 is drawn toward the liquid condenser 59 side.

Therefore, the first conduit 39. Second pipe line 42 and return pipe line 4
The circulation of the refrigerant in 5 becomes very smooth, and it becomes possible to reliably circulate the refrigerant using the relatively small liquid pump 41.

In particular, even when the condenser 37 is disposed below the liquid receiving tank 31 or when the resistance of each pipe line 3942.45 is large, sufficient forced circulation can be easily performed.

Furthermore, since it is possible to reduce the capacity of the liquid pump 41, it is possible to reduce manufacturing costs and power consumption costs.

Furthermore, in the heating device configured as described above, the condenser 59 only needs to re-condense the gas that has been depressurized and flashed in the return pipe 45, for example.
As such, it is possible to use a relatively simple device with a small capacity.

〔Effect of the invention〕

As described above, according to the present invention, since the condenser for cooling the refrigerant in the return pipe is disposed above the liquid receiving tank in the return pipe, the gas in the return pipe is is recondensed in the condenser, the internal pressure in the condenser and liquid receiving tank is reduced, and as a result, the refrigerant in the return pipe is drawn toward the condenser. There is an advantage that the circulation of the refrigerant in the conduit, the second conduit, and the return conduit becomes very smooth, and the refrigerant can be reliably circulated using a relatively small liquid pump.

[Brief explanation of drawings]

FIG. 1 is a piping system diagram showing an embodiment of the heating device of the present invention. FIG. 2 is a piping system diagram showing a conventional heating and cooling system. [Description of symbols of main parts] 31...Liquid receiving tank 33...Evaporator 37...Condenser 39...First pipe line 41...Liquid pump 42...Second pipe line 45...Return pipe line 59...Liquid condenser.

Claims (1)

[Claims] (1) 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 an external heat source, and a condenser that exchanges heat between the refrigerant and indoor air. , 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 second pipe line connecting the other side of the evaporator and one side of the condenser. a return pipe connecting the other side of the condenser and the inlet side of the liquid receiving tank; A heating device characterized in that it is equipped with a condenser that cools the liquid.