JPS593349Y2 - air conditioner - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an air conditioner that cools and heats a room, and particularly relates to a heat pump type air conditioner.

[Technical background of the invention and its problems]

Conventionally, this type of heat pump air conditioner has a compressor a, a four-way valve b, and an outdoor heat exchanger C, as shown in FIG.
, capillary tube d, and indoor heat exchanger e are sequentially repeated to form a refrigeration cycle that returns from the four-way valve to the compressor a, and the room is heated and cooled by switching the four-way valve. .

However, in this air conditioner, the compressor a
The refrigerant discharged from the compressor and the refrigerant returned to the compressor a both pass through one four-way valve, so when the discharged refrigerant and the refrigerant returned to the four-way valve pass through the four-way valve, both refrigerants pass through the four-way valve. They interact with each other and exchange heat through the glass walls.

Therefore, the heat loss of the refrigerant discharged from the compressor a is large, and the amount of loss is, for example, 100 to 200 Kcal.
/ h, and there was a waste of set ability.

Further, in the above-mentioned air conditioner, since the heating and cooling capacity is constant, it is difficult to control the indoor temperature to an appropriate temperature according to the outside temperature.

Therefore, it has been desired to make the heating and cooling capacity variable so that it can be adjusted.

[Purpose of invention]

The present invention takes the above-mentioned points into consideration and aims to provide an air conditioner that can efficiently and fully utilize its set capacity by minimizing the heat loss of the discharged refrigerant.

[Summary of the idea]

In order to achieve the above object, the air conditioner according to the present invention includes a compressor, a first three-way valve having first to third ports, and a first three-way valve having first to third ports.
and a second port, an outdoor heat exchanger, a capillary tube, an indoor heat exchanger, and an on-off valve are sequentially connected through a pipe line to form a circulation path, and a third port of the first three-way valve; A pipe line between the indoor heat exchanger and the on-off valve is connected via a first pipe line, and a pipe line between the first three-way valve and the outdoor heat exchanger is connected to the pipe line between the indoor heat exchanger and the on-off valve. A conduit between the on-off valve and the compressor is connected by a second conduit through the first and second ports of a second three-way valve having first to third ports, and The third port of the three-way valve No. 2 is connected to the discharge side of the compressor, and heating and cooling are switched by switching both the three-way valves and the on-off valve without using the four-way valve. .

[Example of idea]

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

FIGS. 2 and 3 show the heat pump type air conditioner during cooling and heating.

In the figure, reference numeral 10 is a compressor, and this compressor 10 has a first three-way valve 11. The outdoor heat exchanger 12, the capillary tube 13, the indoor heat exchanger 14, and the on-off valve 15 are sequentially connected to the inflow side of the compressor 10 to constitute one refrigeration cycle.

The three-way valve 11 has first to third ports A, B, and C, and the first port A is connected to the compressor 10 and the second port B is connected to the outdoor heat exchanger 12. each connected.

Further, the third port C of the first three-way valve 11 is connected to the pipeline between the on-off valve 15 and the indoor heat exchanger 14 via the first pipeline 16, and By switching the valve 11, the refrigerant discharged from the compressor 10 is selectively supplied to either the outdoor heat exchanger 12 or the indoor heat exchanger 14.

On the other hand, a pipe line between the first three-way valve 11 and the outdoor heat exchanger 12 and a pipe line between the on-off valve 15 and the compressor 10 are connected by a second pipe line 17. There is.

In the middle of this second conduit 17, there are first to third ports.
A second three-way valve 18 having ports D, E, and F is provided, the first port D and the second port E being connected to the second port.
It is configured to communicate with the conduit 17 of.

The third port (F) of the second three-way valve 18 is connected to the discharge side of the compressor 10.

Further, a return path 21 is formed by the pipe 20 having the on-off valve 15 and the second pipe 17, and the discharge refrigerant discharged from the compressor 10 passes through this return path 21 and returns to the compressor 10. It is designed to be refluxed.

The return path 21 largely bypasses the first three-way valve 11 so that the refrigerant returned to the compressor 10 does not pass through the first three-way valve 11.

As shown in FIGS. 4 to 6, the second three-way valve 18 has a cylindrical body 25, and an electromagnetic coil 26 is disposed on the upper outer periphery of the cylindrical body 25. As shown in FIGS.

At the lower side part of this cylindrical body 25, an inlet pipe 27 from the compressor 10 connected to the third port F and a second port E
An outlet pipe 28 to the compressor 10 connected to the compressor 10 is provided close to the top and bottom.

Furthermore, a communication pipe 29 forming the second conduit 17 is connected to the first port D in addition to the introduction pipe 27 and the outlet pipe 28.

Further, a diaphragm 30 is provided at the bottom of the cylindrical main body 25.

This diaphragm 30 is connected to a detector 31 that detects room temperature, and moves up and down as the sealed gas expands and contracts as the room temperature rises and falls.

As the diaphragm 30 moves up and down, a closure body 33 connected to it via a spring 32 is elastically moved up and down.

The closing body 33 is housed inside the cylindrical body 25, and a valve body 34 is provided on the side of the closing body 33 to allow the inlet pipe 27 and the outlet pipe 28 to communicate with each other.

This valve body 34 is pressed by a spring 35 toward each port (E and F) of the inlet pipe 27 and the outlet pipe 28, and is pressed against the port side.

Now, when the electromagnetic coil 26 is kept in a non-energized state during cooling operation, the valve body 34 inserted into the closing body 33 closes at least one of the inlet pipe 27 and the outlet pipe 28, and the outlet pipe 27 is led out from the inlet pipe 27. The bypass line leading to pipe 28 is closed, thereby stopping the circulation of the refrigerant (FIG. 4).

Next, when the detector 31 detects a fall in the room temperature and the diaphragm 30 moves downward, the closing body 33 moves downward and the valve body 3
4 communicates the inlet pipe 27 and the outlet pipe 28 with each other to circulate the refrigerant within the bypass pipe line.

In this case, the opening amount of each port of the inlet pipe 27 and the outlet pipe 28 is adjusted by the amount of movement of the valve body 34, and thereby the temperature of the refrigerant returned to the inflow side of the compressor 10 can be adjusted, and the temperature of the refrigerant returned to the inflow side of the compressor 10 can be adjusted. In addition, the cooling capacity can be changed and adjusted (Fig. 5).

Furthermore, when the electromagnetic coil 26 is energized during heating operation, the closing body 33 rises and the communication pipe 2
9 and the outlet pipe 28 to form a refrigerant flow path different from that during cooling operation.

Next, the operation of the air conditioner will be explained.

During cooling operation, as shown in Fig. 2, the first three-way valve 1
The first three-way valve (11. After being sequentially guided to the outdoor heat exchanger 12 and capillary tube 13, this refrigerant is supplied to the indoor heat exchanger 14, where it exchanges heat with indoor air, cools the room, and then passes through an on-off valve (two-way valve). ) 15 to the compressor 10 again.

In that case, if the room temperature drops too much, it will be detected by the detector (temperature sensing part) 31 and the diaphragm 30 will be actuated to open each port (E, F) of the inlet pipe 27 and outlet pipe 28 of the second three-way valve 18. and open the bypass line.

As a result, a part of the refrigerant discharged from the compressor 10 circulates within the bypass pipe line, and the cooling capacity changes.

At this time, since the vertical movement of the diaphragm 30 is controlled in accordance with the room temperature, the amount of refrigerant circulating in the bypass pipe can be adjusted, and accurate room temperature control and power saving can be achieved.

In addition, during heating operation, the first three-way valve 11 is switched to communicate the first port A and the third port C, as shown in FIG. The air is guided to the exchanger 14, where it exchanges heat with indoor air to heat the room.

In this case, the second three-way valve 18 is switched to connect the first port D and the second port E to connect the communication pipe 29 and the outlet pipe 2.
8, and the on-off valve 15 is closed.

The refrigerant that has been heat exchanged and cooled in the indoor heat exchanger 14 passes through the capillary tube 13 and the outdoor heat exchanger 12, and then is guided into the second pipe line 17, and then passed through the second three-way valve 18. It is returned to the compressor 10 through the

Of course, the refrigerant flow paths can be switched simultaneously by interlocking the two three-way valves 11, 18 and the on-off valve 15 without operating them individually.

Therefore, the air conditioner according to this embodiment has high temperature and
Since the high-pressure refrigerant does not exchange heat with the low-temperature, low-pressure refrigerant that is returned to the compressor 10, no heat loss occurs at all as in conventional air conditioners using four-way valves.

By using the two three-way valves 11, 18 and the on-off valve 15, the discharge side pipe line and the return line 21 can be made into separate systems that do not come into contact with each other for heat exchange. Able to drive efficiently.

Also, during cooling operation, the second three-way valve 18 with a diaphragm
Accordingly, the amount of refrigerant discharged through the refrigeration cycle can be automatically adjusted and controlled depending on the room temperature, so the cooling capacity of the entire device can be varied, and room temperature adjustment and power saving can be achieved.

[Effect of idea]

As described above, in the air conditioner according to the present invention, the refrigerant flow path is switched using two three-way valves and an on-off valve without using a four-way valve, so that the high-temperature and high-pressure refrigerant discharged from the compressor is However, there is no direct heat exchange at the flow path switching section with the low-temperature, low-pressure refrigerant that is returned to the compressor, making it possible to operate while effectively preventing heat loss, while ensuring sufficient and reliable operating efficiency. It has excellent effects such as being able to achieve the desired results.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram showing a conventional air conditioner, Figs. 2 and 3 are refrigeration cycle diagrams during heating and cooling, and Fig. 4 shows an embodiment of the air conditioner according to this invention. is a cross-sectional view of a three-way valve incorporated in the return path to the compressor, and FIG. 5 is a cross-sectional view of the main part of the three-way valve when the cooling capacity is variable.
FIG. 6 is a sectional view of essential parts of the three-way valve during heating. 10...Compressor, 11...First three-way valve, 12...Outdoor heat exchanger, 13...
・Capillary tube, 14... Indoor heat exchanger, 15... Closure valve (three-way valve), 16...
...First pipe line, 17... Second pipe line, 18.
...Second three-way valve, 20...Pipe line, 21
...Return path, 27...Introduction pipe, 28.
...Outlet pipe, 29...Communication pipe, 30...
...Diaphragm, 33...Occluded body, 34
... Valve body, 35 ... Spring.

Claims (1)

[Scope of utility model registration request] A compressor, first and second ports of a first three-way valve having first to third ports, an outdoor heat exchanger, a capillary tube, an indoor heat exchanger, and an on-off valve are sequentially connected by a pipe line. forming a circulation path, connecting the third port of the first three-way valve and the pipe line between the indoor heat exchanger and the on-off valve via the first pipe line, A pipe line between the first three-way valve and the outdoor heat exchanger and a pipe line between the on-off valve and the compressor are connected to a second three-way valve having first to third ports. An air conditioner characterized in that the first and second ports are connected by a second pipe line, and the third port of the second three-way valve is connected to the discharge side of the compressor.