JP3348402B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

FIG. 4 shows a cooling and heating device disclosed in this publication. The cooling and heating device includes a liquid receiving tank 11,
A condenser / evaporator 13 for exchanging heat with an external cold or hot heat source 13
And at least one or more room evaporator / condenser 15 for exchanging heat with room air, necessary piping and cooling / heating switching valves, and a liquid pump 17 for performing a heat cycle by these.
And a chlorofluorocarbon-based refrigerant is used as a heat transfer means.

[0004] In the above-described cooling and heating apparatus, since the CFC-based refrigerant is circulated and used as the heat transfer means, the amount of the refrigerant to be conveyed is reduced, and the power is reduced.
It is possible to reduce the size of the piping and save the installation space.

[0005] Further, in the conventional liquid pump system, only cooling can be performed. However, this cooling and heating device can be used for both cooling and warming because of a reversible cycle.
It is suitable for use with a heat source and can easily control the imbalance of indoor load.

[0006]

However, in such a conventional cooling and heating apparatus, since the liquid receiving tank 11 is disposed, a relatively large amount of refrigerant is required in the piping system, and the amount of refrigerant is large. Therefore, when the refrigerant leaks from the piping system into the room, there is a problem that the room may be in an oxygen-deficient state.

Further, since the liquid receiving tank 11 is disposed, the number of components of the piping system increases, and there is a problem that the apparatus becomes complicated. In addition, both during cooling and during heating,
It is necessary to operate the liquid pump 17 at all times to forcibly circulate the refrigerant, and there is a problem that the operation of the liquid pump 17 requires a large amount of electric energy.

The present invention has solved the above-mentioned problems, and it is possible to significantly reduce the amount of refrigerant in a piping system as compared with the prior art, and to stop the operation of the liquid pump during heating. The purpose is to provide.

[0009]

SUMMARY OF THE INVENTION A cooling and heating apparatus according to the present invention comprises a room evaporator / condenser for exchanging heat between a refrigerant that changes in gas-liquid phase and room air, and the refrigerant and external cold and hot water. A condenser / evaporator for exchanging heat with a heat source, and a first pipe connecting one side of the condenser / evaporator and one side of the chamber evaporator / condenser and having a liquid pump interposed therebetween. A second conduit connecting the other side of the chamber evaporator / condenser to the other side of the condenser / evaporator; and an on-off valve arranged to bypass the liquid pump of the first conduit. And a bypass pipe having the following .: The chamber evaporator / condenser is arranged above the condenser / evaporator, and the liquid pump is arranged below the condenser / evaporator. Things.

[0010]

According to the present invention, during cooling, the on-off valve of the bypass line is closed and the liquid pump is operated.
The refrigerant flows into the room evaporator / condenser through the first conduit,
Here, the air inside the room is cooled by receiving the evaporative action, and flows into the condenser / evaporator through the second pipe, where it is subjected to the condensing action and circulates in the piping system.

In this case, since the liquid pump is disposed below the condenser / evaporator, the effective suction head of the liquid pump is sufficiently ensured. On the other hand, during heating, the on-off valve of the bypass pipe is opened, the liquid pump is stopped, and the refrigerant is bypassed because the condenser / evaporator is disposed below the room evaporator / condenser. The natural gas flows into the condenser / evaporator through the pipe in a natural circulation state, where it is subjected to the evaporating action, passes through the second pipe to the room evaporator / condenser, where it is subjected to the condensing action and receives the condensing action. Heats the air and naturally circulates through the piping system.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 shows an embodiment of a cooling and heating apparatus according to the present invention. 1 shows an evaporator / condenser for use (only one is shown).

Reference numeral 23 denotes a condenser / evaporator for exchanging heat between the refrigerant and an external cold or hot heat source. The condenser / evaporator 23 has a cold source such as cold water or the like from the outside. A cold / hot heat source supply pipe 25 for supplying a hot heat source such as hot water is inserted therethrough.

A first conduit 27 is formed by connecting one side of the condenser / evaporator 23 to one side of the chamber evaporator / condenser 21. A pump 29 is provided.

A second conduit 31 is formed by connecting the other side of the chamber evaporator / condenser 21 to the other side of the condenser / evaporator 23. Further, a bypass pipe 33 is disposed so as to bypass the liquid pump 29 of the first pipe 27, and an on-off valve 35 is disposed in the bypass pipe 33.

In this embodiment, the room evaporator / condenser 21 is disposed above the condenser / evaporator 23 by a height Hc. Further, the liquid pump 29 is disposed below the condenser / evaporator 23 by a height Hs.

In the cooling and heating device configured as described above,
At the time of cooling, as shown in FIG. 2, the on-off valve 35 of the bypass pipe 33 is closed, and the cold / hot heat source supply pipe 25 of the condenser / evaporator 23 is supplied with a cold source made of, for example, cold water. , The liquid pump 29 is operated.

Then, the refrigerant flows through the first pipe 27 into the evaporator / condenser 21 for the room, where it undergoes the evaporating action to cool the air inside the room, and condenses through the second pipe 31. It flows into the evaporator / evaporator 23, where it undergoes a condensation action and circulates through the piping system.

On the other hand, at the time of heating, as shown in FIG. 3, the on-off valve 35 of the bypass pipe 33 is opened, and the cooling / heating source supply pipe 25 of the condenser / evaporator 23 is made of, for example, hot water. The temperature source is supplied, and the liquid pump 29 is stopped.

The refrigerant is supplied to the room evaporator / condenser 21
Since the condenser / evaporator 23 is disposed below,
Flows into the condenser / evaporator 23 through the bypass line 33,
Here, it is gasified by the evaporating action, flows into the room evaporator / condenser 21 through the second pipe line 31 and heats the air inside the room by the condensing action, and then bypasses by its own weight. Natural circulation is performed in the piping system through the pipe 33.

In the cooling and heating apparatus configured as described above, the apparatus is provided with a room evaporator / condenser 21 for exchanging heat between a refrigerant that changes in gas-liquid phase and room air, a refrigerant and a cold temperature from outside. A condenser / evaporator 23 for exchanging heat with a heat source;
One side of the condenser / evaporator 23 and the room evaporator / condenser 2
1 is connected to one side of the first evaporator / condenser 21 and the other end of the first conduit 27 in which the liquid pump 29 is interposed. Conduit 31 and first conduit 2
7 and a bypass line 33 having an on-off valve 35 disposed bypassing the liquid pump 29 of FIG. 7, and the room evaporator / condenser 21 is disposed at a position above the condenser / evaporator 23. Since the liquid pump 29 is disposed below the evaporator 23, the amount of refrigerant in the piping system can be significantly reduced, and the operation of the liquid pump 29 can be stopped during heating.

That is, in the cooling and heating apparatus described above, the liquid receiving tank is not required, so that the amount of refrigerant required for the piping system can be significantly reduced as compared with the related art. Further, since the amount of the refrigerant is reduced, it is possible to eliminate the fear that the room will be in an oxygen-deficient state when the refrigerant leaks from the piping system.

Further, since the liquid receiving tank is not required, the number of components of the piping system is reduced, and the apparatus becomes very simple. Further, in the above-described cooling / heating device, the room evaporator / condenser 21 is disposed at a position above the condenser / evaporator 23, so that the refrigerant is naturally circulated during heating, and the liquid pump 29 is operated during heating. Liquid pump 2
9 can reduce the electric energy required for operation.

Since the refrigerant naturally circulates during the heating, the refrigerant is not excessively supplied to the condenser / evaporator 23 during the heating, and the unevaporated refrigerant is supplied to the gas pipe of the condenser / evaporator 23. There is no danger of flowing into the air.

During cooling, the liquid pump 29 is operated, but the liquid pump 29 is located below the condenser / evaporator 23.
Is disposed, the effective suction head (NPSH) of the liquid pump 29 is sufficiently ensured, and it is possible to reliably prevent the liquid pump 29 from generating cavitation.

By using a pump having a small required effective suction head such as a gear pump as the liquid pump 29, the required height Hs can be reduced. Further, the condenser / evaporator 23 and the liquid pump 29 in the first conduit 27
By increasing the diameter of the pipe between them, the resistance to the refrigerant during this time is reduced, and the required height Hs can be reduced.

Further, by using a heat exchanger having a small internal volume such as a plate heat exchanger as the condenser / evaporator 23, it is possible to further reduce the amount of refrigerant charged into the piping system. .

[0028]

As described above, according to the present invention, it is possible to greatly reduce the amount of refrigerant in the piping system as compared with the related art, and to stop the operation of the liquid pump during heating. is there.

[Brief description of the drawings]

FIG. 1 is a piping system diagram showing one embodiment of a cooling and heating device of the present invention.

FIG. 2 is a piping system diagram illustrating a state of the cooling and heating apparatus in FIG. 1 during cooling.

FIG. 3 is a piping diagram showing a state of the cooling and heating device of FIG. 1 during heating.

FIG. 4 is a piping diagram showing a conventional cooling and heating device.

[Explanation of symbols]

 21 Room evaporator / condenser 23 Condenser / evaporator 27 1st line 29 Liquid pump 31 2nd line 33 Bypass line 35 On-off valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F28D 15/02-15/06 F25B 1/00 399 F24F 5/00

Claims (1)

(57) [Claims] 1. A room evaporator / condenser for exchanging heat between a refrigerant that changes in gas-liquid phase and room air, a condenser / evaporator for exchanging heat between the refrigerant and an external cold / hot water heat source, A first conduit connecting one side of the condenser / evaporator and one side of the chamber evaporator / condenser and having a liquid pump interposed therebetween, and the other side of the chamber evaporator / condenser and the A second conduit connecting the other side of the condenser / evaporator; and a bypass conduit having an on-off valve arranged to bypass the liquid pump of the first conduit. A cooling and heating apparatus comprising: an evaporator / condenser for a room arranged at an upper position; and a liquid pump arranged at a position below the evaporator / condenser.