JP2854688B2 - 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. 7 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. Heat exchange with, at least one or more chamber evaporator and condenser 15, required piping and cooling / heating switching valve, and a liquid pump 17 for performing a heat cycle by these are arranged and configured. In addition, a CFC-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.

And in this air conditioner, when heating, the liquid pump
17 is operated, and the refrigerant in the liquid receiving tank 11 flows into the condenser / evaporator 13 through the first conduit 18 as shown by a thick line in the drawing,
Here, it is subjected to the evaporating action and flows into the room evaporator / condenser 15 through the second pipe 19, where it is subjected to the condensing action to heat the air inside the room. Through the receiving tank 11
Circulates within.

[Problems to be solved by the invention]

However, in such a conventional cooling and heating device, since the refrigerant is forcibly circulated by the operation of the liquid pump 17,
There is a problem that a relatively large liquid pump 17 having sufficient forced circulation capacity is required.

In particular, the chamber evaporator / condenser 15 is disposed below the liquid receiving tank 17, or the resistance of each of the pipes 18, 19, 20 is large,
Further, at the time of heating using the sixth pipeline 20, the actual head may become larger, and it may be difficult to perform sufficient forced circulation.

An object of the present invention is to solve the above-described problems and to provide a cooling and heating device that can reliably circulate a refrigerant by a relatively small liquid pump.

[Means for solving the problem]

The cooling and heating device according to claim 1 includes a liquid receiving tank that stores a refrigerant that changes in a gas-liquid phase in a liquid state, a room evaporator / condenser that exchanges heat between the refrigerant and room air; A condenser for exchanging heat with a cold heat source, an evaporator for exchanging heat between the refrigerant and an external heat source during heating, an outlet side of the liquid receiving tank, and one side of the chamber evaporator / condenser. And a second pipe connecting the other side of the chamber evaporator / condenser and the inlet side of the liquid receiving tank; A third conduit in which the condenser is disposed at a position above the liquid receiving tank which is communicated at one end and the other end with a gas portion formed at an upper portion, and an outlet side of the liquid receiving tank and the evaporator. A fourth conduit connecting one side, and connecting the other side of the evaporator to the other side of the chamber evaporator / condenser. And 5 pipe is made and a sixth conduit connecting the inlet side of the receiver tank and one side of the chamber evaporator and condenser.

According to a second aspect of the present invention, in the first aspect, the room evaporator / condenser is disposed below the liquid receiving tank and the opening / closing valve is interposed by bypassing the liquid pump in the first conduit. This is provided in a bypass pipe.

(Operation)

In the invention of claim 1, at the time of cooling, the refrigerant in the liquid receiving tank flows into the room evaporator / condenser through the first conduit, where the refrigerant in the room receives the evaporating action and cools the air inside the room. Second
Circulates into the receiving tank through a pipe. The gas of the refrigerant flowing into the gas portion of the liquid receiving tank passes through one end of the third conduit, is condensed in the condenser, and is naturally condensed from the other end of the third conduit to the liquid storing portion of the liquid receiving tank. You will fall.

On the other hand, at the time of heating, the refrigerant in the liquid receiving tank flows into the evaporator through the fourth conduit, receives the evaporating action here, flows into the room evaporator / condenser through the fifth conduit, Here, the air inside the room is heated by the condensation action, and then circulates through the sixth conduit into the liquid receiving tank.

During this heating, by supplying a cold heat source to the condenser, the refrigerant gas flowing into the gas portion of the liquid receiving tank from the sixth pipe passes through one end of the third pipe and enters the condenser. It is condensed and falls naturally from the other end of the third pipe line into the liquid storage part of the liquid receiving tank, and the internal pressure in the liquid receiving tank is reduced, whereby the refrigerant in the sixth pipe line is directed toward the liquid receiving tank. Will be drawn.

According to a second aspect of the present invention, in the first aspect, the room evaporator / condenser is disposed below the liquid receiving tank, and the opening / closing valve is interposed by bypassing the liquid pump in the first conduit. Since the bypass pipe is provided, the refrigerant in the liquid receiving tank passes through the first pipe and the bypass pipe and flows naturally to the room evaporator / condenser by opening the on-off valve of the bypass pipe during cooling. It will surely flow in a circulating state.

〔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 evaporative transfer 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 an example of the evaporator / condenser 23 for the chamber, and the first conduit 29 is formed in the first conduit 29 in order from the liquid receiving tank 21 side. , A liquid pump 31, an on-off valve 33, and a control valve 35.

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

Further, one end and the other end of the gas part 48 formed in the upper part of the liquid receiving tank 21 are communicated with the gas part 48 so that the third pipe
39 are located.

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 open / close valve 33 of the first pipe 29 and the control valve 35 and connected to the inlet side of the liquid receiving tank 21 is arranged. , An on-off valve 49 is arranged.

A control valve 53 whose degree of opening is controlled by a signal from a pressure sensor 69 disposed in the liquid receiving tank 21 is disposed in the cold heat source supply pipe 27.
It is configured such that the condensation of the refrigerant in 25 is controlled.

Further, a control valve 57 whose opening is controlled by a signal from a pressure sensor 51 disposed in the fifth conduit 45 is disposed in the heat source supply pipe 28, and 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 conduit 29, and a liquid level sensor 63 is disposed in the fourth conduit 41. The operation of the liquid pump 31 is controlled by the surface sensor 63.

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 of the refrigerant flowing into the gas portion 48 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. Will naturally fall into the liquid storage unit 50.

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, 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 conduit 41, where it is vaporized by the evaporating action,
The air flows into the room evaporator / condenser 23 through the fifth line 45, where it is condensed to heat the air inside the room, and then through the sixth line 47 into the liquid receiving tank 21. Circulates.

At the time of this heating, the cold heat source supply pipe 27 of the condenser 25
In, for example, by supplying a cold source consisting of cold water,
The refrigerant gas flowing into the gas portion 48 of the liquid receiving tank 21 from the sixth pipe 47 passes through one end of the third pipe 39, is condensed in the condenser 25, and is condensed from the other end of the third pipe 39. Liquid storage part 50 of liquid receiving tank 21
And the internal pressure of the gas portion 48 in the liquid receiving tank 21 is reduced, whereby the refrigerant in the sixth pipe 47 is drawn toward the liquid receiving tank 21.

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

Thus, in the air conditioner configured as described above,
A third conduit 39 having one end and the other end communicated with a gas portion 48 formed on the upper part of the liquid receiving tank 21 is formed.
Since the condenser 25 is disposed at a position above the liquid receiving tank 21, a cooling source is supplied to the condenser 25 during heating, so that the gas flows into the gas portion 48 of the liquid receiving tank 21 from the sixth pipe 47. The gaseous portion of the refrigerant that has passed passes through one end of the third pipe 39 and is condensed in the condenser 25, and falls naturally from the other end of the third pipe 39 into the liquid storage part 50 of the liquid receiving tank 21. The internal pressure in the tank 21 decreases, whereby the refrigerant in the sixth pipe 47 is drawn toward the liquid receiving tank 21.

Therefore, the circulation of the refrigerant in the fourth conduit 41, the fifth conduit 45, and the sixth conduit 47 becomes very smooth, and the refrigerant can be reliably circulated by the relatively small liquid pump 31.

In particular, when the chamber evaporator / condenser 23 is disposed below the liquid receiving tank 21, or when each of the pipes 41, 45, 47
When the resistance is large, sufficient forced circulation can be easily performed.

Further, since the capacity of the liquid pump 31 can be reduced, the manufacturing cost and the power consumption cost can be reduced.

Further, in the cooling / heating device configured as described above, it is not necessary to dispose the condenser 25 directly on the second conduit 37, and the flow resistance of the second conduit 37 can be reduced.

When an excess refrigerant liquid is supplied in order to improve the efficiency of the room evaporator / condenser 23, an excess liquid remains in the second conduit 37, which enters the condenser 25 and condenses. Although the efficiency is reduced, in the present invention, the liquid in the second conduit 37 is dropped and separated in the liquid receiving tank 21 and only the gas is supplied to the condenser 25, so that the reduction in the condensation efficiency is reduced. .

FIG. 4 shows another embodiment of the cooling and heating apparatus of the present invention. In this embodiment, the room evaporator / condenser 23 is disposed below the liquid receiving tank 21. 1 pipe 29
A bypass pipe 75 in which an on-off valve 73 is interposed is provided so as to bypass the liquid pump 31.

In the cooling and heating apparatus configured as described above, at the time of cooling, as shown in FIG. 5, the on-off valve 73 of the bypass pipe 75 is opened, the liquid pump 31 is stopped, and the refrigerant in the liquid receiving tank 21 is cooled. Since the chamber evaporator / condenser 23 is disposed below the liquid receiving tank 21, the first pipe 29 and the bypass pipe 75
Flows into the room evaporator / condenser 23 in a natural circulation state,
Here, the air inside the room is cooled by the evaporating action, and the second pipe line is cooled.
It circulates through the liquid receiving tank 21 through 37. Then, the gas component of the refrigerant flowing into the gas portion of the liquid receiving tank 21 is supplied to the third pipe.
After passing through one end of 39, it is condensed in the condenser 25 and falls naturally from the other end of the third conduit 39 into the liquid storage part of the liquid receiving tank 21.

On the other hand, at the time of heating, as shown in FIG. 6, the on-off valve 73 of the bypass pipe 75 is closed, the liquid pump 31 is operated, and the refrigerant in the liquid receiving tank 21 evaporates through the fourth pipe 41. Into the chamber 26, where it undergoes the evaporative action, flows through the fifth conduit 45 into the room evaporator / condenser 23, where it undergoes the condensing action to heat the air inside the room, It circulates through the sixth pipe 47 into the liquid receiving tank 21.

Although the cooling / heating device configured as described above can obtain substantially the same effect as the embodiment shown in FIG. 1, in this embodiment, the room evaporator / condenser 23 is moved from the liquid receiving tank 21 Since the bypass pump 75 is disposed below and bypasses the liquid pump 31 of the first pipe 29 and the bypass pipe 75 provided with the open / close valve 73 is provided, the open / close valve 73 of the bypass pipe 75 is opened during cooling. As a result, the refrigerant in the liquid receiving tank 21 reliably flows into the room evaporator / condenser 23 through the first pipe 29 and the bypass pipe 75 in a natural circulation state. Operation can be stopped.

〔The invention's effect〕

As described above, according to the air conditioner of claim 1,
Since a third pipe line having one end and the other end communicated with the gas portion formed at the upper part of the liquid receiving tank was formed, and the condenser was arranged at a position above the liquid receiving tank in the third pipe line, Even during heating, by supplying a cold heat source to the condenser, the refrigerant gas flowing into the gas portion of the liquid receiving tank from the sixth pipe passes through one end of the third pipe and is condensed in the condenser. , Naturally falls from the other end of the third conduit into the liquid storage portion of the liquid receiving tank, and the internal pressure in the liquid receiving tank is reduced, whereby the refrigerant in the sixth conduit is drawn toward the liquid receiving tank. Therefore, the circulation of the refrigerant in each pipeline and the sixth pipeline becomes very smooth,
There is an advantage that the refrigerant can be reliably circulated by a relatively small liquid pump.

According to a second aspect of the present invention, in the first aspect, the room evaporator / condenser is disposed below the liquid receiving tank, and the opening / closing valve is interposed by bypassing the liquid pump in the first conduit. Since the bypass pipe is provided, the refrigerant in the liquid receiving tank passes through the first pipe and the bypass pipe and flows naturally to the room evaporator / condenser by opening the on-off valve of the bypass pipe during cooling. There is an advantage that the operation of the liquid pump can be stopped at the time of cooling since the inflow is ensured in a circulating state.

[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 another embodiment of the cooling / heating device of the present invention. FIG. 5 is a piping diagram showing the state of the cooling system shown in FIG. FIG. 6 is a piping system diagram showing a state at the time of heating in FIG. FIG. 7 is a piping diagram showing a conventional cooling and heating device. [Explanation 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 pipeline 39 ... Third pipeline 41 ... Fourth pipeline 45 ... Fifth pipeline 47 ... Sixth pipeline.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-76336 (JP, A) JP-A-4-86431 (JP, A) JP-A-63-116051 (JP, A) JP-A-2- 57835 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) F24F 5/00

Claims (2)

(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 for exchanging heat, an evaporator for exchanging 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 are connected. A first pipe line in which a liquid pump is interposed, a second pipe line connecting the other side of the chamber evaporator / condenser and an inlet side of the liquid receiving tank, and formed on an upper portion of the liquid receiving tank. A third conduit in which one end and the other end are communicated with the gas part to be disposed and the condenser is disposed at a position above the liquid receiving tank, an outlet side of the liquid receiving tank, and one side of the evaporator. A fourth pipe connecting the other side of the evaporator and the other side of the chamber evaporator / condenser; Air conditioner characterized by comprising and a sixth conduit connecting the one side of the serial chamber evaporator and condenser and the inlet side of the receiver tank. 2. An evaporator / condenser for a room is disposed below a liquid receiving tank, and a bypass line provided with an on-off valve is provided to bypass a liquid pump in a first line. The cooling and heating device according to claim 1, wherein: