JP2898368B2 - Air conditioning - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an example of a 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, where it undergoes an evaporating action, and the second conduit It flows into the room evaporator / condenser 15 through 19, where it is condensed to heat the air inside the room, and then circulates through the sixth conduit 20 into the liquid receiving tank 11.

[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 pipe line 20, the actual head becomes very large, and there is a possibility that it is 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 during cooling, an evaporator for exchanging heat between the refrigerant and an external heat source at the time of heating, and an outlet side of the liquid receiving tank and the evaporator / condenser for the chamber. And a second pipe connecting the other side of the condenser and the other side of the condenser and the first side of the condenser, and a second pipe connecting the other side of the chamber evaporator / condenser and one side of the condenser. A third conduit connecting the other side to the inlet side of the liquid receiving tank, a fourth conduit connecting the outlet side of the liquid receiving tank and one side of the evaporator, and the other side of the evaporator. A fifth conduit connecting 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 to a position above the said liquid receiving tank of the sixth conduit is made by the medium condenser for cooling the refrigerant of the sixth conduit arranged.

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. A bypass pipe is provided.

(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
Flows into the condenser through a conduit, where it is condensed,
Thereafter, the liquid is circulated through the third conduit into the liquid receiving tank.

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.

According to the first aspect of the present invention, since the condenser for cooling the refrigerant in the sixth conduit is disposed at a position above the liquid receiving tank in the sixth conduit, the gas content in the sixth conduit is reduced. Is re-condensed in the condenser, the internal pressure in the condenser and the receiving tank is reduced,
As a result, the refrigerant in the sixth conduit is drawn toward the 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. 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 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 / condenser 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.

In addition, a second conduit 37 is formed by connecting the other side of the chamber evaporator / condenser 23 to one side of the condenser 25.

Further, a third conduit 39 is formed by connecting the other side of the condenser 25 and the inlet side of the liquid receiving tank 21.

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.
The sixth pipeline 47 is provided with an on-off valve 49.

A control valve 53 whose degree of opening is controlled by a signal from a pressure sensor 51 disposed in the second conduit 37 is disposed in the cold heat source supply pipe 27.
It is configured such that the condensation of the refrigerant in 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 this embodiment, the liquid receiving tank 21 of the sixth conduit 47 is
A condenser 65 that cools the refrigerant in the sixth conduit 47 is disposed at a position above the condenser.

A chilled water supply pipe 67 for supplying chilled water is connected to the condenser 65, and the chilled water supply pipe 67 is connected to a liquid receiving tank.
A control valve 71 whose opening is controlled by a signal from a pressure sensor 69 disposed at 21 is disposed.

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 Then, it flows into the condenser 25, where it undergoes a condensation action, and thereafter circulates through the third conduit 39 into the liquid receiving tank 21.

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 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.

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

Thus, in the air conditioner configured as described above,
Since the condenser 65 for cooling the refrigerant in the sixth pipe 47 is disposed at a position above the liquid receiving tank 21 in the sixth pipe 47, the gas content in the sixth pipe 47 is reduced during heating. The refrigerant is recondensed in the condenser 65, and the internal pressure in the condenser 65 and the liquid receiving tank 21 is reduced, whereby the refrigerant in the sixth pipe 47 is drawn toward the condenser 65. Become.

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, the condenser 65 is, for example, decompressed in the sixth pipe 47 and only needs to recondense the flushed gas. It is possible to use a relatively simple one having a small capacity.

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 flows into the condenser 25 through 37, where it is condensed,
Thereafter, the liquid circulates through the third conduit 39 into 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, Condenser through 6th line 47
After being condensed at 65, it circulates in 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 condenser for cooling the refrigerant in the sixth conduit is disposed at a position above the liquid receiving tank in the sixth conduit, gas in the sixth conduit is recondensed in the condenser. Since the internal pressure in the condenser and the liquid receiving tank is reduced, and the refrigerant in the sixth conduit is drawn toward the condenser, the refrigerant in each conduit and the sixth conduit is reduced. This has the advantage that the circulation of the refrigerant becomes very smooth and 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. [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… 2nd line 39 ... 3rd line 41 ... 4th line 45 ... 5th line 47 ... 6th line 65 ... Condenser.

Continuing on the front page (72) Inventor Akiyuki Kawashima 1-48-8 Itabashi, Itabashi-ku, Tokyo 1404 Diamond Palace Itabashi 1404 (72) Inventor Satoshi Nakazawa 3-58-8, Kameido, Koto-ku, Tokyo 202 (56) References JP-A-1-174834 (JP, A) JP-A-1-252833 (JP, A) JP-A-2-57835 (JP, A) (58) Fields investigated (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 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 one side of the condenser, and another side of the condenser. A third conduit connecting the inlet side of the liquid receiving tank, a fourth conduit connecting the outlet side of the liquid receiving tank and one side of the evaporator, and the other side of the evaporator and the chamber A fifth conduit connecting the other side of the evaporator / condenser, and a sixth line connecting one side of the chamber evaporator / condenser and the inlet side of the liquid receiving tank. And a road, the upward a position of the receiver tank of the sixth conduit, heating and cooling apparatus, characterized by comprising a medium condenser for cooling the refrigerant of the sixth conduit arranged. 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: