JP2854689B2 - Air conditioning - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling and heating device, and more particularly to a cooling and heating device using a refrigerant that changes in gas-liquid phase.

[Conventional technology]

2. Description of the Related Art Conventionally, as a cooling and heating device using a refrigerant that changes in gas-liquid phase such as a chlorofluorocarbon-based refrigerant, for example, a cooling and heating device disclosed in Japanese Patent Application Laid-Open No. 2-57835 filed by the present applicant has been known.

FIG. 4 shows a cooling / heating device disclosed in this publication. The cooling / heating device includes a liquid receiving tank 11, a condenser / evaporator 13 for exchanging heat with an external cooling / heating source, and indoor air. At least one room evaporator / condenser for heat exchange
15, a required piping and a cooling / heating switching valve, and a liquid pump 17 for performing a heat cycle by these, are arranged, and a chlorofluorocarbon-based refrigerant is used as a heat transfer means.

In the cooling and heating apparatus as described above, since the CFC-based refrigerant is circulated and used as the heat transport means, the amount of the refrigerant transported is reduced, the power is reduced, the size of the piping is reduced, and the installation space is reduced. It is possible to save money.

In addition, the conventional liquid pump system can perform only cooling, but this cooling / heating device can be used for both cooling and warming because of the reversible cycle, and is also suitable for use with a DHC heat source. Unbalance can be easily controlled.

[Problems to be solved by the invention]

However, in such a conventional cooling and heating device, it is necessary to always operate the liquid pump 17 and to forcibly circulate the refrigerant during both cooling and heating, which requires a large amount of electrical energy to operate the liquid pump 17. There was a problem.

An object of the present invention is to solve the above-described problem and to provide a cooling and heating device that can stop the operation of a liquid pump during heating.

[Means for solving the problem]

The cooling and heating device according to the present invention includes a liquid receiving tank that stores cooling that changes in gas-liquid phase in a liquid state, a room evaporator and condenser that exchanges heat between the cooling and room air, A condenser for exchanging heat with a cold heat source during cooling,
An evaporator for exchanging heat between the refrigerant and an external heat source during heating, and a liquid pump interposed between an outlet side of the liquid receiving tank and one side of the chamber evaporator / condenser. One conduit, a second conduit connecting the other side of the chamber evaporator / condenser and the inlet side of the liquid receiving tank, and one end and another part in a gas portion formed on the upper part of the liquid receiving tank. A third conduit in which the end is communicated and the condenser is arranged at a position above the liquid receiving tank, and a fourth conduit connecting an outlet side of the liquid receiving tank and one side of the evaporator. A fifth conduit connecting the other side of the evaporator and the other side of the chamber evaporator / condenser, and one side of the chamber evaporator / condenser and an inlet side of the liquid receiving tank. A sixth conduit for connection, wherein the chamber evaporator / condenser is arranged above the liquid receiving tank, and at a position below the liquid receiving tank. Serial in which the evaporator is arranged comprising.

(Operation)

In the present invention, at the time of cooling, the liquid pump is operated, and the refrigerant in the liquid receiving tank flows into the room evaporator / condenser through the first pipe, where the refrigerant in the room is subjected to the evaporating action and the air inside the room is received. It cools and circulates through the second conduit into the liquid receiving tank.
The refrigerant gas flowing into the gas portion of the liquid receiving tank passes through one end of the third conduit and is condensed in the condenser.
It will fall naturally from the other end of the pipe to the liquid storage part of the liquid receiving tank.

On the other hand, at the time of heating, the liquid pump is stopped, and the refrigerant in the liquid receiving tank flows into the evaporator in a natural circulation state through the fourth pipe because the evaporator is disposed below the liquid receiving tank, Here, it is subjected to the evaporating action and flows into the room evaporator / condenser through the fifth pipe, where it is subjected to the condensing action to heat the air inside the room and then received through the sixth pipe. Natural circulation in the liquid tank.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of a cooling and heating apparatus according to the present invention. In the drawing, reference numeral 21 denotes a liquid receiving tank for storing a refrigerant that changes in gas-liquid phase such as a CFC-based refrigerant in a liquid state. ing.

Reference numeral 23 denotes a plurality of room evaporators and condensers (only one is shown) for exchanging heat between the refrigerant and room air.

Reference numeral 25 denotes 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 into the condenser 25. ing.

Reference numeral 26 denotes an evaporator for exchanging heat between the refrigerant and a heat source from the outside, and a heat source supply pipe 28 for supplying a heat source such as hot water from the outside is inserted into the evaporator 26. ing.

A first conduit 29 is formed by connecting the outlet side of the liquid receiving tank 21 and one side of the chamber evaporator and dilator 23, and the first conduit 29 is connected to the liquid receiving tank 21 from the liquid receiving tank 21 side. The liquid pump 31, the on-off valve 33, and the control valve 35 are arranged in this order.

A second conduit 37 is arranged to connect the other side of the chamber evaporator / condenser 23 to the inlet side of the liquid receiving tank 21.

The liquid receiving tank 21 has a third loop-shaped third end communicating with one end and the other end of the gas part 38 formed on the upper part of the liquid receiving tank 21.
A conduit 39 is arranged.

The condenser 25 is disposed at a position above the liquid receiving tank 21 in the third conduit 39.

A fourth conduit 41 is formed by connecting the outlet side of the liquid receiving tank 21 and one side of the evaporator 26, and an on-off valve 43 is arranged in the fourth conduit 41.

A fifth conduit 45 is formed by connecting the other side of the evaporator 26 to the other side of the chamber evaporator / condenser 23.

Further, a sixth pipe 47 branched from the first pipe 29 between the on-off valve 33 and the control valve 35 and connected to the inlet side of the liquid receiving tank 21.
, And an on-off valve 49 is disposed in the sixth conduit 47.

In addition, the cold heat source supply arrangement 27 has a gas portion of the liquid receiving tank 21.
A control valve 53 whose degree of opening is controlled by a signal from a pressure sensor 51 disposed at 38 is disposed, and the control valve 53 controls the condensation of the refrigerant by the condenser 25. .

A control valve 57 whose opening is controlled by a signal from a pressure sensor 55 disposed in the fifth conduit 45 is disposed in the heat source supply pipe 28. The control valve 57 controls the evaporator 26.
It is configured such that the evaporation of the refrigerant in is controlled.

Further, the control valve 35 arranged in the first conduit 29 is configured such that its opening is controlled by a temperature sensor 59 arranged indoors.

Further, a differential pressure sensor 61 for measuring a differential pressure before and after the liquid pump 31 is disposed in the first pipe line 29.
The operation of the liquid pump 31 is controlled by 61.

And in this embodiment, the room evaporator / condenser 23 is
It is disposed above the connection between the liquid receiving tank 21 and the sixth conduit 47 by a height H.

Further, the evaporator 26 is disposed below the liquid level in the liquid receiving tank 21 by a height L.

 In the figure, reference numerals 63 and 65 indicate on-off valves.

In the cooling / heating device configured as described above, as shown in FIG. 2, during cooling, a cooling source made of, for example, cold water is supplied to the cold heat source supply pipe 27 of the condenser 25, and the liquid pump 31
Is activated.

Then, the refrigerant in the liquid receiving tank 21 flows into the room evaporator / condenser 23 through the first line 29, where it undergoes the evaporating action to cool the air inside the room, and the second line 37 Through the receiving tank
Circulates within 21. Then, the gas portion of the refrigerant flowing into the gas portion 38 of the liquid receiving tank 21 passes through one end of the third pipe 39, is condensed in the condenser 25, and is condensed in the condenser 25 from the other end of the third pipe 39.
Naturally falls into the liquid storage part 62 of

In FIG. 2, black on-off valves indicate closed states, and white on-off valves indicate open states.

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

Then, since the evaporator 26 is disposed below the liquid receiving tank 21, the refrigerant in the liquid receiving tank 21 flows into the evaporator 26 through the fourth conduit 41, where it undergoes an evaporating action to be gasified. Then, the air flows into the indoor evaporator / condenser 23 through the fifth pipe 45, where it is condensed to heat the air inside the chamber, and then received by its own weight through the sixth pipe 47. Natural circulation in the liquid tank 21 occurs.

In FIG. 3, the black on-off valves indicate the closed state, and the white on-off valves indicate the open state.

Thus, in the air conditioner configured as described above,
Since the chamber evaporator / condenser 23 is arranged above the liquid receiving tank 21 and the evaporator 26 is arranged below the liquid receiving tank 21, the refrigerant in the liquid receiving tank 21 is heated during heating. The air flows into the evaporator 26 through the four pipes 41, receives the evaporating action there, and flows into the evaporator / condenser 23 for the room through the fifth pipe 45, receives the condensing action here, and receives the air inside the room. Is heated, and thereafter, naturally circulates in the liquid receiving tank 21 through the sixth pipe 47, and the operation of the liquid pump 31 can be stopped during heating.

Therefore, at the time of heating, a power supply for operating the liquid pump 31 is not required, and the heating cost can be significantly reduced as compared with the related art.

Further, in the cooling and heating device configured as described above, a third pipe 39 is provided in which one end and the other end are communicated with a gas portion 38 formed above the liquid receiving tank 21. The gas portion 38 of the liquid receiving tank 21 is positioned above the liquid receiving tank 21.
Since the condenser 25 for condensing the gas of the refrigerant flowing into the tank is disposed, the internal pressure in the liquid receiving tank 21 is reduced, and the refrigerant in the second pipe 37 is drawn toward the liquid receiving tank 21 side. Become.

Therefore, the circulation of the refrigerant in the second conduit 37 becomes very smooth, and the refrigerant can be reliably circulated by the relatively small liquid pump 31.

Further, in the cooling and heating device configured as described above, the third loop 39 having a loop shape is separately provided in the liquid receiving tank 21, and the condenser 25 is arranged in the third pipeline 39. It is possible to effectively eliminate an increase in the pipeline resistance of the pipeline 37 and the like.

〔The invention's effect〕

As described above, according to the present invention, the chamber evaporator / condenser is arranged above the liquid receiving tank, and the evaporator is arranged below the liquid receiving tank. The refrigerant in the tank flows into the evaporator through the fourth conduit, receives the evaporating action here, flows into the evaporator / condenser for the room through the fifth conduit, and receives the condensing action here. The inside air is heated and then naturally circulates through the sixth conduit into the liquid receiving tank, so that the operation of the liquid pump can be stopped during heating.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing one embodiment of the cooling and heating device of the present invention. FIG. 2 is a piping system diagram showing a state during cooling in FIG. FIG. 3 is a piping system diagram showing a state at the time of heating in FIG. FIG. 4 is a piping diagram showing a conventional cooling and heating device. [Description of Signs of Main Parts] 21… Liquid receiving tank 23… Room evaporator / condenser 25… Condenser 26… Evaporator 29… First line 31… Liquid pump 37… Second pipe 38 Gas section 39 Third pipe 41 Fourth pipe 45 Fifth pipe 47 Sixth pipe.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-116051 (JP, A) JP-A-4-76333 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24F 5/00

Claims (1)

(57) [Claims] 1. A liquid receiving tank containing a refrigerant that changes in gas-liquid phase in a liquid state, a room evaporator / condenser for exchanging heat between the refrigerant and room air, a cold heat source from the outside and the refrigerant. A condenser that exchanges heat during cooling, an evaporator that exchanges heat between the refrigerant and an external heat source during heating, an outlet side of the liquid receiving tank, and one side of the evaporator / condenser for the chamber. A first pipe line connected and provided with a liquid pump, a second pipe line connecting the other side of the chamber evaporator / condenser and the inlet side of the liquid receiving tank, and an upper part of the liquid receiving tank A third conduit in which one end and the other end are communicated with a gas portion formed at the upper end of the liquid receiving tank and the condenser is disposed above the liquid receiving tank; And a fifth pipe connecting the other side of the evaporator and the other side of the chamber evaporator / condenser. And a sixth pipe connecting an example of the chamber evaporator / condenser and an inlet side of the liquid receiving tank, wherein the chamber evaporator / condenser is provided above the liquid receiving tank. A cooling and heating device, wherein the evaporator is arranged below the liquid receiving tank.