JPH06257874A - Heat pump type air-conditioning machine - Google Patents

Abstract

PURPOSE:To improve the performance of a heat exchanger and achieve the miniaturization of the heat exchanger by a method wherein a plurality of four-way changeover valves are provided in the title machine so that refrigerant is conducted from one direction with respect to an outdoor heat exchanger and an indoor heat exchanger upon both of cooling and heating. CONSTITUTION:Four-way changeover switches 2, 3, 7 are positioned as shown by solid lines in a diagram to pass high-pressure high-temperature gas refrigerant, compressed by a compressor 1, from the four-way changeover valve 2 into an outdoor heat exchanger 4 through the four-way changeover valve 3 so as to obtain liquid refrigerant by effecting heat exchange in the outdoor heat exchanger 4 between air sent by an outdoor fan 11 and supply it into an indoor heat exchanger 10 through the four-way changeover valve 3, a check valve 5 and a throttle 9 for cooling whereby cold air is generated upon cooling. On the other hand, upon heating, respective four- way changeover valves 2, 3, 7 are switched to positions shown by dotted lines to send discharged gas refrigerant into the indoor heat exchanger 10 to generate warm air by heat exchange between air sent by an indoor fan 12, then, the refrigerant is returned to the compressor 1 through a check valve 8, throttle 6 for heating, the outdoor heat exchanger 4 and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type heat exchanger capable of improving the performance of indoor and outdoor heat exchangers.

[0002]

2. Description of the Related Art A refrigerant circuit of a conventional heat pump type air conditioner is shown in FIG. Reference numeral 1 is a compressor, 2 is a four-way switching valve, 4 is an outdoor heat exchanger, 5 is a check valve, 6 is a throttle for heating provided in parallel with the check valve 5, 8 is a check valve, and 9 is a check valve. A cooling throttle provided in parallel with the valve, 10 is an indoor heat exchanger, 11 is an outdoor fan, and 12 is an indoor fan.

During cooling, the high-temperature and high-pressure gas refrigerant compressed by the compressor 1 enters the outdoor heat exchanger 4 from the four-way switching valve 2 and exchanges heat with the air sent by the outdoor fan 11 to become a high-pressure liquid refrigerant. The pressure is reduced by the cooling throttle 9 through the check valve 5, enters the indoor heat exchanger 10, and is heated by the air sent by the indoor fan 12 (the air is cooled and used for cooling).
It becomes low-pressure gas, and returns from the four-way valve 2 to the compressor 1. At the time of heating, the four-way switching valve 2 is switched, and the indoor heat exchanger 10
The action of the outdoor heat exchanger 4 is reversed.

[0004]

In the indoor and outdoor heat exchangers, the four-way switching valve 2 is switched during cooling and heating, so that the flow of the refrigerant is reversed as shown by the arrow in FIG. On the other hand, since the air flow indicated by the white arrow is one direction, the refrigerant flow and the air flow direction are parallel flow in either heat exchanger and counter flow in the other heat exchanger. . Regarding both condenser capacity and evaporator capacity, the refrigerant and air flows in opposite directions, that is, the counterflow is larger. When the heat exchanger is used as a condenser, the counterflow is more likely to cause supercooling and requires a smaller amount of refrigerant.

In the conventional heat exchanger, as described above,
Since the flow of the refrigerant and the flow of the air are parallel flows in one of the indoor and outdoor heat exchangers, it is inevitable that the condenser capacity or the evaporator capacity becomes small.

The present invention is intended to provide a heat pump type air conditioner capable of solving the above problems.

[0007]

A heat pump heat exchanger according to the present invention has a compressor, a four-way switching valve, an outdoor heat exchanger, a throttle mechanism, and an indoor heat exchanger, and the four-way switching valve causes a refrigerant flow. A heat pump type air conditioner that switches between directions to perform cooling and heating, characterized by comprising means for flowing a refrigerant from one direction to the outdoor heat exchanger and the indoor heat exchanger during both cooling and heating. .

[0008]

In the present invention, the direction of the refrigerant flowing through the indoor heat exchanger and the outdoor heat exchanger is always made to be one direction during both the cooling and the heating, so that the air flow and the refrigerant flow are always opposite to each other. Therefore, the capacities of the indoor heat exchanger and the outdoor heat exchanger are enhanced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, in the refrigerant circuit of the heat pump type air conditioner shown in FIG. 4, the four-way switching valve 3
And a four-way switching valve 7 are added.
4, the same parts as those in FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted.

In this embodiment, a pipe 20 extending from the four-way switching valve 2 to the outdoor heat exchanger 4, a check valve 5 arranged in parallel from the outdoor heat exchanger 4, and a pipe 21 extending to the heating throttle 6. A four-way switching valve 3 for switching the connection between the two is provided. Also,
Four-way switching for switching the connection between the pipe 24 from the four-way switching valve 2 to the indoor heat exchanger 10, the check valve 8 provided in parallel from the indoor heat exchanger 10, and the pipe 23 to the cooling throttle 9. A valve 7 is provided. Reference numeral 22 is a pipe line connecting the check valve 5 and the heating throttle 6 to the check valve 8 and the cooling throttle 9. Further, in FIG. 1, the solid and dotted lines of the four-way switching valves 2, 3, and 7 indicate the states during cooling and heating, respectively, and the solid arrows and the white arrows indicate the flow directions of the refrigerant during cooling and heating, respectively. Show.

In this embodiment, during cooling, the four-way switching valves 2, 3 and 7 are set to the positions shown by the solid line, and the high pressure and high temperature gas refrigerant compressed by the compressor 1 is as shown by the solid line arrow in FIG. The four-way switching valve 2 passes through the four-way switching valve 3 and enters the outdoor heat exchanger 4, exchanges heat with the air sent by the outdoor fan 11 to become a high-pressure liquid refrigerant, and enters the four-way switching valve 3 again.
After passing through the check valve 5, the pressure is reduced by the cooling throttle 9 and enters the indoor heat exchanger 10, where it exchanges heat with the air sent by the indoor fan 12 to become a low-pressure gas refrigerant, which becomes a four-way switching valve 7 to a four-way switching valve 2. And returns to the compressor 1.

During heating, the four-way switching valves 2, 3, 7 are switched to the positions shown by the dotted lines, and the high-temperature high-pressure gas refrigerant compressed by the compressor 1 is switched to the four-way switching as shown by the white arrow in FIG. After passing through the valve 2 and the four-way switching valve 7 into the indoor heat exchanger 10 and cooled by the air sent by the indoor fan 10 to become a high-pressure liquid refrigerant, the four-way switching valve 7 again passes through the check valve 8 and the heating throttle 6 The outdoor heat exchanger 4 reduces the pressure in the outdoor fan 11
The heat is exchanged with the air sent in to form a low-pressure gas refrigerant, which again enters the four-way switching valve 3 and returns to the compressor 1 via the four-way switching valve 2.

In the present embodiment, as indicated by the solid arrow and the white arrow in FIG. 1, the refrigerant flows in the same direction in the indoor heat exchanger 10 and the outdoor heat exchanger 4 both during cooling and during heating. Flows to. Therefore, as shown in FIG. 2, in both heat exchangers 4 and 10, the flow of air and the flow of refrigerant can be made to be a counter flow both during cooling and during heating, and their condenser capacity and evaporator capacity can be improved. Can be increased.

A second embodiment of the present invention will be described with reference to FIG. In this embodiment, the four-way switching valve 3 of the first embodiment is used.
Instead of the solenoid valves 3a to 3d, the four-way switching valve 7 is replaced with solenoid valves 7a to 7d.

That is, the solenoid valve 3a is provided in the pipe 30 from the four-way switching valve 2 to the outdoor heat exchanger 4, and the outdoor heat exchanger 4 is provided in the pipe 31 from the outdoor heat exchanger 4 to the indoor heat exchanger 10. Solenoid valve 3b, solenoid valve 7 in this order from indoor heat exchanger 10 to
a and the throttle 9 for cooling are provided, and the solenoid valve 7b is provided in the pipe 32 from the indoor heat exchanger 10 to the four-way switching valve 2.

From the conduit 30 to the conduit 31 to the conduit 34 connecting the electromagnetic valve 3a of the conduit 30 and the outdoor heat exchanger 4 and the electromagnetic valve 3b of the conduit 31 and the electromagnetic valve 7a. A heating throttle 6 and a solenoid valve 3c are sequentially provided in this order. Between the four-way switching valve 2 and the solenoid valve 3a of the pipe 30 and the pipe 3
Conduit 3 connecting between the outdoor exchanger 4 of No. 1 and the solenoid valve 3b
3 is provided with a solenoid valve 3d. The position of the solenoid valve 7a from the confluence point of the pipe 34 and the pipe 31 between the solenoid valve 3b of the pipe 31 and the solenoid valve 7a, and the indoor heat exchanger 10 of the pipe 32 and the solenoid valve 7b. Conduit 35 connecting between
Is provided with a solenoid valve 7c. Further, a solenoid valve 7d is provided in a pipe line 36 that connects between the solenoid valve 7b of the pipe line 32 and the four-way switching valve 2 and between the cooling throttle 9 of the pipe line 31 and the indoor heat exchanger 10. There is.

In this embodiment, the check valves 5 and 8 in the first embodiment are omitted. In FIG. 3, solid lines and white arrows indicate the flow directions of the refrigerant during cooling and heating, respectively, and solid and dotted lines of the four-way switching valve 2 indicate states during cooling and heating, respectively.

In this embodiment, during cooling, the four-way switching valve 2 is set to the position shown by the solid line and the solenoid valves 3a, 3b, 7a,
7b is opened and the solenoid valves 3c, 3d, 7c and 7d are closed. The high-pressure and high-temperature gas refrigerant compressed by the compressor 1 is shown in FIG.
As shown by the solid line arrow, the four-way switching valve 2 flows through the solenoid valve 3a in the pipe 30 and enters the outdoor heat exchanger 4 to exchange heat with the air sent by the outdoor fan 11 to become a high-temperature refrigerant. , Through the solenoid valve 3b, the solenoid valve 7a, and the cooling throttle 9 in the pipe line 31, is reduced in pressure by the cooling throttle 9, enters the indoor heat exchanger 10, and exchanges heat with the air sent by the indoor fan 12. Becomes a low-pressure gas refrigerant, and the pipeline 32
It flows through the inside through the solenoid valve 7b, and returns to the compressor 1 through the four-way switching valve 2.

During heating, the four-way switching valve is set to the position shown by the dotted line, and the solenoid valves 3c, 3d, 7c and 7d are opened,
The solenoid valves 3a, 3b, 7a, 7b are closed. The high-temperature and high-pressure gas refrigerant compressed by the compressor 1 passes through the solenoid valve 7d from the four-way switching valve 2 through the pipe 36 as shown by the white arrow in FIG.
Through which it enters the indoor heat exchanger 10 and is cooled by the air sent by the indoor fan 12 to become a high-pressure liquid refrigerant, which flows through the pipe 35 through the electromagnetic valve 7c, and through the pipe 31 and the pipe 34. Through the solenoid valve 3c and the heating throttle 6, is reduced in pressure by the heating throttle 6 and enters the outdoor heat exchanger 4, and exchanges heat with the air sent by the outdoor fan 11 to become a low-pressure gas refrigerant. It flows through 33 through the solenoid valve 3d, and returns to the compressor 1 through the four-way switching valve 2.

In this embodiment as well, in both cooling and heating, as in the first embodiment,
The refrigerant flows in the same direction in the indoor heat exchanger 10 and the outdoor heat exchanger 4, whereby the air flow and the refrigerant flow in the two heat exchangers 4 and 10 can be always opposite to each other. It is possible to enhance its condenser capacity and evaporator capacity.

[0021]

As described above, according to the present invention, in the heat pump type air conditioner, the refrigerant flows through the outdoor heat exchanger and the indoor heat exchanger in the same direction both during cooling and during heating. As a result, the performance of these heat exchangers can be improved, whereby the heat exchanger can be downsized and the amount of refrigerant can be reduced.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a flow of refrigerant and a flow of air in the heat exchanger according to the embodiment.

FIG. 3 is a refrigerant circuit diagram of a second embodiment of the present invention.

FIG. 4 is a refrigerant circuit diagram of a conventional heat pump type air conditioner.

FIG. 5 is an explanatory diagram showing the flow of refrigerant and air in the heat exchanger of the conventional heat pump type air conditioner.

[Explanation of symbols]

 1 Compressor 2,3,7 Four-way switching valve 3a-3d Solenoid valve 4 Outdoor heat exchanger 5,8 Check valve 6 Heating throttle 7a-7d Solenoid valve 9 Cooling throttle 10 Indoor heat exchanger 20-24 Pipeline 30-36 pipeline

Claims (1)

[Claims] 1. A heat pump type air conditioner having a compressor, a four-way switching valve, an outdoor heat exchanger, a throttle mechanism, and an indoor heat exchanger, wherein the four-way switching valve switches a refrigerant flow direction to perform cooling and heating. The heat pump type air conditioner according to claim 1, further comprising means for flowing the refrigerant from one direction to the outdoor heat exchanger and the indoor heat exchanger both during cooling and during heating.