JPH0634234A - Air conditioner - Google Patents

Abstract

PURPOSE:To eliminate an erroneous operation to a dehumidifying at the time of a high temperature and to effectively perform a room cooling. CONSTITUTION:A compressor, a four-way switching vale, an outdoor heat exchanger, an expansion valve, a first indoor heat exchanger, a second indoor heat exchanger are sequentially connected via conduits, and a switching valve 1 for controlling switching of room cooling/heating and dehumidifying and a capillary tube 38 are connected in parallel between the first and the second heat exchangers. A first passage 2 connected to the first exchanger, a second passage 3 connected to the second exchanger and a valve seat 4 connected between both the passages are provided in the valve 1. A valve disc 5 extended at an end 5a having a small diameter to be extended to the side of the passage 3 is so disposed at the passage 2 as to be freely reciprocated. The disc 5 is energized in a valve opening direction by a bias spring 7 compressed in the passage 2 and in a valve closing direction by a shape memory spring 6 compressed in the passage 3. The spring 6 is elongated by high temperature refrigerant fed from the passage 2 to bring the disc 5 into contact with the seat 4.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention has an opening / closing valve provided with a spring made of a shape memory alloy between two divided indoor heat exchangers, which enables dehumidifying operation in addition to cooling / heating operation. Air conditioner

[0002]

2. Description of the Related Art Conventionally, an air conditioner of this type is known, for example, as shown in FIG.
260564). This air conditioner includes a compressor 3
1, four-way switching valve 32, outdoor heat exchanger 33, expansion valve 34, first
The indoor heat exchanger 35a and the second indoor heat exchanger 35b are sequentially connected by pipelines 36a to 36f, and an opening / closing valve 37 and a capillary tube as a pressure reducing means are provided between the first and second indoor heat exchangers 35a and 35b. 38 connected in parallel with each other,
7 is opened to operate both indoor heat exchangers 35a and 35b as an evaporator or a condenser for cooling and heating operations, while the on-off valve 37 is closed to make the first indoor heat exchanger 35a a condenser and the second indoor The heat exchanger 35b serves as an evaporator to perform the dehumidifying operation. Also, the compressor 3
1. A heat storage heat exchanger 39 that stores heat radiation from the compressor in a heat storage material inside is provided on the outer periphery of 1, and one end 39a of the heat storage heat exchanger 39 is connected to the motorized valve 40.
Is connected to the pipe 36c of the expansion valve 34 on the side of the outdoor heat exchanger 33 by the first bypass pipe 41, while the other end 39b of the heat storage heat exchanger is connected to the expansion valve 34 by the second bypass pipe 42. Connected to the pipe line 36d on the side of the first indoor heat exchanger 35a to allow the refrigerant to flow into the heat storage heat exchanger 39 for heating, and the heated refrigerant is defrosted from the outdoor heat exchanger 33 and the on-off valve 37 described later.
It is used to close the valve. In addition, outdoor and indoor heat exchangers 33, 3
5 is blown by the outdoor fan 43 and the indoor fan 44, respectively.

The on-off valve 37 detects the temperature of the refrigerant and automatically opens and closes. As shown in FIG.
A first passage 52 connected to the first indoor heat exchanger 35a and a second passage 53 connected to the second indoor heat exchanger 35b are formed therein, and the first passage 52 is provided between both passages. The valve seat 54 is formed toward the upper end of the first passage, and an annular spacer 55 is slidably fitted in the large diameter portion 52a of the first passage, and the spacer 55 is biased by a shape memory spring 56 in the valve closing direction. The valve element 58, which is biased in the valve opening direction by 57, has a flange portion 58b at the rear end that prevents the valve seat 54 from opening and closing by opening and closing the valve seat 54 in the center hole of the spacer 55. It is made by fitting in. Then, during the cooling operation shown in FIG. 3 (A), the shape memory spring 56 contracts in contact with the low-temperature refrigerant flowing in as indicated by the arrow, and the bias spring 57 acts to cause the spacer 5 to move.
5, the valve element 58 is separated from the valve seat 54, and the on-off valve 3
7 opens, the shape memory spring 56 expands in contact with the high temperature refrigerant flowing in as indicated by the arrow during the dehumidifying operation shown in FIG. 3 (B), and the spacer 55 contacts the tip end step portion of the large diameter portion 52a. The valve element 58 receives the fluid force of the inflowing refrigerant and slides in the valve seat direction to close the on-off valve 37. On the contrary, during the heating operation shown in FIG. 3C, the shape memory spring 56 extends in contact with the high-temperature refrigerant flowing in from the second passage 53 side as indicated by the arrow, and the spacer 55 causes the tip of the large diameter portion 52a to move. Although contacting the step, the valve body 58 slides toward the first passage 52 side until it contacts the pin 59 by receiving the fluid force of the inflowing refrigerant, and the on-off valve 37 opens.

In the above air conditioner, in order to perform the cooling operation, the expansion valve 34 is opened to a predetermined opening, the electric valve 40 is closed, and the refrigerant discharged from the compressor 31 is circulated as indicated by the solid arrow in FIG. And after condensing with the outdoor heat exchanger 33,
It is evaporated in the indoor heat exchanger 35. At this time, the first and second
The on-off valve 37 between the indoor heat exchangers 35a and 35b is shown in FIG.
Since the valve is opened by contraction of the shape memory spring 56 as described in (A), both the indoor heat exchangers 35a and 35b work as an evaporator, and the indoor fan 44 blows air to cool the room. On the contrary, in order to perform the heating operation, the four-way switching valve 32 is switched to circulate the discharged refrigerant in the reverse direction as indicated by the broken line arrow in FIG. Then, the on-off valve 37 is opened by the fluid force of the inflowing refrigerant as described with reference to FIG.
Both 35b work as a condenser, and are heated by the blow of the indoor fan 44.

On the other hand, in order to perform the dehumidifying operation, the four-way switching valve 32 is set to the same switching position as in the cooling mode, both the outdoor and indoor fans 43 and 44 are stopped, and the expansion valve 34 and the motor-operated valve 4 are operated.
Fully open 0. The refrigerant discharged from the compressor 31 remains at a high temperature through the expansion valve 34 without being condensed in the outdoor heat exchanger 33, and a part of the refrigerant is further heated from the first bypass pipe 41 through the heat storage heat exchanger 39. And flows into the first indoor heat exchanger 35a and reaches the on-off valve 37, respectively. Then, the on-off valve 37 is closed by the rapid expansion of the shape memory spring 56 as described in FIG. 3 (B), so that all the refrigerant flows through the capillary tube 38 and is expanded and depressurized there. ,
The first indoor heat exchanger 35a on the upstream side functions as a condenser, and the second indoor heat exchanger 35b on the downstream side functions as an evaporator.
Then, the indoor air is blown by the indoor fan 44 to be first cooled and dehumidified through the second indoor heat exchanger 35a, and then heated to room temperature through the first indoor heat exchanger 35a to become dehumidified air. In the defrosting operation at the start of the heating operation, the four-way switching valve 32 is set to the same switching position as in the heating mode,
The indoor fan 44 is stopped, the expansion valve 34 is closed, and the electric valve 40
To drive the compressor 31. Then, the discharged refrigerant is
After passing through the indoor heat exchanger 35 at a high temperature without condensing, passing through the heat storage heat exchanger 39 in the direction opposite to the one-dot chain line arrow, after being heated, it flows into the outdoor heat exchanger 33, and the high temperature refrigerant heats the outdoor heat. Frost attached to the exchanger 33 is removed.

[0006]

However, in the above-mentioned conventional air conditioner, the on-off valve 37 which is interposed between the indoor heat exchangers 35a and 35b and automatically closes during the dehumidifying operation.
As described in FIG. 3, since the shape memory spring 56 in the first passage 52 extending in contact with the high temperature refrigerant biases the valve body 58 in the valve closing direction, the air conditioner is started. When the temperature of the room is high (for example, 40 ° C.), the on-off valve 37 in the indoor unit also has a high temperature, and the shape memory spring 56 extends to close the valve. Therefore, even if the air conditioner is started in the cooling operation mode, since the on-off valve 37 is closed, all the refrigerant flows through the capillary tube 38, and the dehumidifying operation is performed instead of the cooling operation. . Then, once the on-off valve 37 is closed as shown in FIG.
The first passage 52, which communicates with the first heat exchanger 35a that functions as a condenser on the upstream side of the capillary tube 38, does not have a low temperature, and the shape memory spring 56 in this passage may also contract due to contact with the low-temperature refrigerant. On the other hand, the on-off valve 37 remains closed due to the pressure difference across the capillary tube 38.
Therefore, the cooling operation in which both the indoor heat exchangers 35a and 35b work as evaporators cannot be performed.

Therefore, an object of the present invention is to improve the dehumidifying operation at high temperature with a simple structure by devising the arrangement of the shape memory spring in the on-off valve that automatically opens and closes by sensing the refrigerant temperature. An object of the present invention is to provide an air conditioner that can be eliminated and can reliably perform cooling operation.

[0008]

In order to achieve the above object, the air conditioner of the present invention has a compressor 31, a four-way switching valve 32, an outdoor heat exchanger 33, as illustrated in FIGS. ,
The expansion valve 34, the first indoor heat exchanger 35a, and the second indoor heat exchanger 35b are sequentially connected by pipelines 36a to 36f, and the first,
An on-off valve 37 and a pressure reducing means 38 are connected in parallel between the second indoor heat exchangers 35a and 35b, and the on-off valve 37 is opened so that both indoor heat exchangers 35a and 35b function as an evaporator or a condenser. Cooling and heating operations are performed while the on-off valve 37 is closed to operate the first indoor heat exchanger 35a as a condenser and the second indoor heat exchanger 35b as an evaporator to perform dehumidification operation. , The on-off valve 3
Reference numeral 7 denotes a first passage 2 connected to the first indoor heat exchanger 35a and a second passage 2 connected to the second indoor heat exchanger 35b.
A passage 3, a valve seat 4 provided between the first and second passages 2 and 3, and a reciprocatingly arranged on the side of the first passage 2 for opening and closing the valve seat 4 and having a small diameter. A valve body 5 having a tip portion 5a extending through the opening formed by the valve seat 4 toward the second passage 3 side, and contracted into the first passage 2 to urge the valve body 5 in the valve opening direction. The mounted bias spring 7 and the second passage 3 are compressed so as to urge the valve body 5 in the valve closing direction, and expand when they come into contact with the high-temperature refrigerant flowing from the first passage 2 side. Then, the shape memory spring 6 that brings the valve body 5 into contact with the valve seat 4
It is characterized by consisting of.

[0009]

[Function] First and second indoor heat exchangers 35a of the air conditioner,
In the on-off valve 37 interposed between the 35b, the first passage 2 is connected to the first indoor heat exchanger 35a, and the second passage 3 is connected to the second indoor heat exchanger 35b. The passages 2 and 3 are
They are connected to each other by external pressure reducing means 38. With the start of the cooling operation, it is discharged from the compressor 31, condensed in the outdoor heat exchanger 33, expanded valve 34 and the first indoor heat exchanger 3
The low-temperature refrigerant passing through 5a flows into the first passage 2 of the opening / closing valve 37. Since the shape memory spring 6 compressed in the second passage 3 of the on-off valve 37 is contracted unless the temperature of the chamber is extremely high, the valve body 5 is the bias spring 7 compressed in the first passage 2. The opening / closing valve 37 is opened by being urged in the valve opening direction. The shape memory spring 6 does not expand even if it contacts the inflowing low temperature refrigerant, and the open / close valve 37 maintains the open state. Therefore, both the indoor heat exchangers 35 on the upstream and downstream sides of the on-off valve 37.
Both a and 35b work as an evaporator to cool the room. On the other hand, when the temperature inside the room is extremely high, the shape memory spring 6 expands against the bias spring 7, and the open / close valve 37 is closed. Then, with the start of the cooling operation, the first
All the low temperature refrigerant flowing into the passage 2 flows through the pressure reducing means 38 in parallel with the on-off valve 37 and is expanded and depressurized there,
The first indoor heat exchanger 35a on the upstream side functions as a condenser, and the second indoor heat exchanger 35b on the downstream side functions as an evaporator, and the dehumidifying operation is performed. However, the shape memory spring 6 in the second passage 3, which is on the downstream side of the decompression device 38, contracts by contacting the refrigerant whose temperature has become low due to expansion and decompression, so that the compressor 31 is stopped after a short dehumidifying operation. . This allows
The valve body 5 that has stopped receiving the fluid force in the valve closing direction due to the circulating refrigerant is slid in the valve opening direction by the bias spring 7, and the opening / closing valve 37 opens. Therefore, when the compressor 31 is restarted, the low-temperature refrigerant passing through the outdoor heat exchanger 33 and the expansion valve 34 flows through the open on-off valve 37, and both the upstream and downstream indoor heat exchangers 35a and 35b evaporate. It works as a container and the room is cooled.

In the dehumidifying operation, by stopping the outdoor fan 43 and fully opening the expansion valve 34, the refrigerant discharged from the compressor 31 remains at a high temperature, passes through the first indoor heat exchanger 35a, and then the first opening / closing valve 37 is opened. Reach passage 2. As long as the temperature of the room is not extremely high, or even if the temperature is extremely high, the opening / closing valve 37 opens due to the cooling of the shape memory spring 6 associated with the above-mentioned valve closing. The bias spring 7 expands in contact with the high-temperature refrigerant flowing in through the opening of the seat 4.
Against this, the valve body 5 is slid to close the open / close valve 37. Then, all the refrigerant from the first indoor heat exchanger 35a flows through the decompression means 38 and is expanded and decompressed there. Therefore, the upstream first indoor heat exchanger 35a serves as a condenser, and the downstream indoor heat exchanger 35a. The two indoor heat exchangers 35b work as evaporators,
The room is dehumidified. When the on-off valve 37 is closed, the second
The shape memory spring 6 in the passage 3 is cooled by the low-temperature refrigerant passing through the pressure reducing means 38 and contracts, but the differential pressure before and after the pressure reducing means 38 acts on the valve body 5, and the valve closed state is maintained. In the heating operation, the high-temperature discharge cooling from the compressor 31 is
It reaches the on-off valve 37 via the indoor heat exchanger 35b and flows into the second passage 3. The shape memory spring 6 in the second passage 3 expands in contact with the high-temperature refrigerant and tries to slide the valve body 5 in the valve closing direction, but the fluid force of the inflowing refrigerant acts in the opposite direction,
The open / close valve 37 is maintained in the open state. Therefore, the high-temperature refrigerant flows through the open / close valve 37, and both the indoor heat exchangers 35a and 35b on the upstream and downstream sides work as a condenser to heat the room.

[0011]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. Since the refrigerant circuit of the air conditioner of the present invention is the same as that of the conventional example described in FIG. 2, except for the structure of the on-off valve interposed between the first and second indoor heat exchangers, The same number is used for the same member in the refrigerant circuit, and the description of each member is omitted. FIG. 1 is a vertical cross-sectional view showing the structure of the on-off valve. This on-off valve is used in place of the on-off valve 37 of FIG. 2 and senses the temperature of the refrigerant to automatically open and close it. The main indoor 1 has a first indoor heat exchanger 35a (see FIG. 2). The first passage 2 connected to the second indoor heat exchanger 35b
Valve passage 4 is formed between the second passage 3 connected to the first passage 2 and the second passage 3 connected to each other, and the passages 2 and 3 are connected to each other by a capillary tube 38 as an external pressure reducing means. is doing.

A spring bearing 5c is provided at the rear end of the first passage 2.
And a spring receiver 5b is provided at the tip of a small-diameter tip portion 5a extending through the opening formed by the valve seat 4 toward the second passage 3 side, and the valve seat 4 is fixed at the end surface 5d of the large-diameter portion. The valve body 5 that opens and closes is reciprocally arranged, and the bias spring 7 is contracted between the spring receiver 5c and the annular step portion 2a provided on the inner circumference of the first passage 2 so that the valve body 5 is opened. While urging in the valve opening direction, the shape memory spring 6 made of a shape memory alloy is contracted between the spring receiver 5b and the ring 8 fitted to the inner circumference of the second passage 3 to close the valve body 5. Energized in the valve direction. The shape memory spring 6 comes into contact with the low temperature refrigerant flowing from the first passage 2 side as shown by the arrow A during the cooling operation and contracts as shown in the drawing, and the bias spring 7 separates the valve body 5 from the valve seat 4. On the other hand, the valve is closed by the high temperature refrigerant flowing from the first passage 2 side during the dehumidifying operation as shown by the arrow C and from the second passage 3 side during the heating operation as shown by the arrow B. , The spring force at extension is
The valve body 5 is brought into contact with the valve seat 4 against the bias spring 7 to close the valve in cooperation with the fluid force of the inflowing refrigerant indicated by the arrow C, and the fluid force of the inflowing refrigerant and the bias spring 7 indicated by the arrow B.
The valve body 5 is set to a size such that the valve body 5 is separated from the valve seat 4 to open the valve by bending due to the spring force. A pin 9 for restricting outward movement of the valve body 5 is provided at the inlet of the first passage 2.

The operation of the air conditioner having the above structure will be described below centering on the on-off valve 1. The first passage 2 of the opening / closing valve 1 is the first
The second passage 3 is connected to the indoor heat exchanger 35a (see FIG. 2) and the second indoor heat exchanger 35b, respectively.
Are connected to each other by an external capillary tube 38. With the start of the cooling operation, the high temperature refrigerant discharged from the compressor 31 circulates as shown by the solid line arrow in FIG.
It is condensed in the outdoor heat exchanger 33, becomes a low temperature through the expansion valve 34 and the first indoor heat exchanger 35a, and flows into the first passage 2 of the opening / closing valve 1 as shown by an arrow A in FIG. Since the shape memory spring 6 compressed in the second passage 3 of the on-off valve 1 is contracted unless the temperature of the room is extremely high (for example, 40 ° C.), the valve body 5
Is biased in the valve opening direction by a bias spring 7 that is compressed inside the first passage 2, and the opening / closing valve 1 is open. The shape memory spring 6 does not expand even when it comes into contact with the low-temperature refrigerant that flows in through the opening of the valve seat 4, and the open / close valve 1 maintains the open state. Therefore,
Both indoor heat exchangers 35a, 35b on the upstream and downstream sides of the on-off valve 1.
Work together as an evaporator to cool the room.

On the other hand, when the temperature inside the room is extremely high at the start of the cooling operation, the shape memory spring 6 expands against the bias spring 7, and the fluid force by the inflowing refrigerant indicated by the arrow C is applied to the shape memory spring 6.
In addition, the on-off valve 1 is closed. Then the first
All of the low-temperature refrigerant that has flowed into the passage 2 flows through the capillary tube 38 that is in parallel with the on-off valve 1 and is expanded and decompressed there, and then enters the second passage 3. Therefore, the upstream first indoor heat exchanger 35a functions as a condenser, and the second indoor heat exchanger 35b on the downstream side functions as an evaporator, and the dehumidifying operation is performed. Here, the expanded shape memory spring 6 in the second passage 3 comes into contact with the refrigerant whose temperature has become low due to the expansion and decompression of the capillary tube 38 and contracts in a short time of about 3 minutes. Due to the closing of the on-off valve 1, the differential pressure generated before and after the capillary tube 38 acts on the valve body 5,
The on-off valve 1 maintains the closed state. Therefore, when the compressor 31 is stopped about 3 minutes after the valve is closed, the differential pressure disappears and the valve body 5 is slid in the valve opening direction by the bias spring 7, so that the opening / closing valve 1 is opened. Therefore, when the compressor 31 is restarted, the low-temperature refrigerant that has passed through the outdoor heat exchanger 33 and the expansion valve 34 flows through the opening of the open valve seat 4, and the upstream and downstream indoor heat exchangers 35a and 35b are separated. Both work as evaporators and the room is cooled. In addition, once entering the cooling operation,
Since a low-temperature refrigerant flows through the on-off valve 1, the on-off valve 1 does not close again even when the temperature inside the room is high. In this way, the shape memory spring 6 is arranged in the second passage 3 on the downstream side of the valve seat 4 with respect to the refrigerant flow during the cooling operation, and the shape memory spring 6 is expanded at a high temperature in the room to close the valve. Since the spring 6 is cooled and contracted by the low-temperature refrigerant that has flowed through the capillary tube 38 when the valve is closed, even if the dehumidifying operation is temporarily performed by closing the valve, the spring 6 is surely opened immediately for cooling. You can return to driving. Moreover, a malfunction in the dehumidifying operation can be avoided by only slightly changing the structure of the on-off valve 1 from the conventional example shown in FIG. 3, and the economy is excellent.

Next, in the dehumidifying operation, as described above with reference to FIG. 2, by stopping the outdoor fan 43 and fully opening the expansion valve 34 and the motor-operated valve 40, the refrigerant discharged from the compressor 31 remains at a high temperature. It reaches the on-off valve 1 through one indoor heat exchanger 35a. As long as the temperature of the chamber is not extremely high, or even if the temperature is extremely high, the opening / closing valve 1 opens due to the cooling of the shape memory spring 6 accompanying the above-mentioned valve closing. It extends in contact with the high-temperature refrigerant flowing through the opening of the seat 4, and cooperates with the fluid force of the inflow refrigerant indicated by the arrow C,
The valve body 5 is slid against the bias spring 7 to abut against the valve seat 4, and the on-off valve 37 is closed. Then, all of the refrigerant from the first indoor heat exchanger 35a is stored in the capillary tube 38.
Since the first indoor heat exchanger 35a on the upstream side functions as a condenser and the second indoor heat exchanger 35b on the downstream side functions as an evaporator, the indoor space is dehumidified. . When the on-off valve 1 is closed, the shape memory spring 6 in the second passage 3 is cooled and contracted by the low-temperature refrigerant passing through the capillary tube 38. However, as long as the compressor 31 is driven, the shape memory spring 6 remains in the valve body 5. A differential pressure across the capillary tube 38 acts to maintain the valve closed state.

Further, in the heating operation, the high-temperature discharge refrigerant from the compressor 31 reaches the on-off valve 1 via the second indoor heat exchanger 35b as shown by the broken line arrow in FIG.
As described above, it flows into the second passage 3. The shape memory spring 6 in the second passage 3 expands in contact with the high-temperature refrigerant and tries to slide the valve body 5 in the valve closing direction, but in the opposite direction, the spring force of the bias spring 7 and the flow of the inflowing refrigerant flow. Physical force acts and the open state of the on-off valve 1 is maintained. Therefore, the high-temperature refrigerant flows through the open on-off valve 1, both the indoor heat exchangers 35a and 35b on the upstream and downstream sides work as a condenser, and the room is heated. Needless to say, the on-off valve of the present invention is not limited to that of the embodiment shown in FIG.

[0017]

As is apparent from the above description, the air conditioner of the present invention includes a compressor, a four-way switching valve, an outdoor heat exchanger, an expansion valve, a first indoor heat exchanger and a second indoor heat exchanger. The above-mentioned opening and closing are connected in parallel with an on-off valve for controlling the switching between cooling and heating and dehumidifying operation by opening and closing and a pressure reducing means between the first and second indoor heat exchangers. The valve has a first passage connected to the first indoor heat exchanger, a second passage connected to the second indoor heat exchanger, and a valve seat between both passages. A reciprocatingly movable valve element having a narrow tip extending through the opening of the valve seat and extending toward the second passage, and the valve element is opened in the valve opening direction by a bias spring compressed in the first passage. In addition, the shape memory springs are compressed in the second passage to urge them in the valve closing direction, respectively, and come into contact with the high temperature refrigerant flowing from the first passage side. The shape memory spring expands so that the valve element comes into contact with the valve seat, so the open / close valve closes due to the expansion of the shape memory spring due to the high temperature in the room with a simple and economical structure. Even when the dehumidifying operation is temporarily performed, the shape memory spring can be cooled and contracted by the low-temperature refrigerant that has passed through the pressure reducing means, and the valve can be reliably opened after a short time to return to the cooling operation.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an on-off valve used in an air conditioner of the present invention.

FIG. 2 is a refrigerant circuit diagram of a conventional air conditioner and an air conditioner of the present invention.

FIG. 3 is a vertical cross-sectional view showing an on-off valve used in a conventional air conditioner.

[Explanation of symbols]

1 ... Main body of on-off valve, 2 ... First passage, 3 ... Second passage, 4 ...
Valve seat, 5 ... Valve body, 5a ... Thin tip, 6 ... Shape memory spring, 7 ... Bias spring, 31 ... Compressor, 32 ... Four-way switching valve, 33 ... Outdoor heat exchanger, 34 ... Expansion valve , 35 ... Indoor heat exchanger, 35a ... First indoor heat exchanger, 35b ... Second indoor heat exchanger, 36a to 36f ... Pipe line, 37 ... Open / close valve, 38 ... Capillary tube, 43 ... Outdoor fan, 44 ... Indoor fan.

Claims (1)

[Claims] 1. A compressor (31), a four-way switching valve (32), an outdoor heat exchanger (33), an expansion valve (34), a first indoor heat exchanger (35a).
And the second indoor heat exchanger (35b) through the conduits (36a-3
6f), the first and second indoor heat exchangers (35a, 35)
The open / close valve (37) and the pressure reducing means (38) are connected in parallel with each other between b), and the open / close valve (37) is opened to open both the indoor heat exchangers.
Cooling (35a, 35b) by acting as an evaporator or condenser,
While performing the heating operation, the opening / closing valve (37) is closed to operate the first indoor heat exchanger (35a) as a condenser and the second indoor heat exchanger (35b) as an evaporator to perform the dehumidification operation. In the air conditioner to perform, the on-off valve includes a first passage (2) connected to the first indoor heat exchanger (35a) and a second passage connected to the second indoor heat exchanger (35b). (3) and the first and second passages (2, 3)
And a valve seat (4) provided between the valve seat (4) and the first passage (2) side so as to open and close the valve seat (4) so that the valve seat (4) has a small diameter tip (5a). A valve body (5) extending through the opening formed by the seat (4) toward the second passage (3), and the valve body (5)
A bias spring (7) compressed in the first passage (2) to urge the valve body (5) in the valve opening direction and the second passage (3) to urge the valve body (5) in the valve closing direction. ) Inside the first passage
A shape memory spring that expands when it comes into contact with the high-temperature refrigerant flowing in from the (2) side to bring the valve body (5) into contact with the valve seat (4).
An air conditioner comprising (6).