JPH09138016A - Heat pump type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover refrigerant in a refrigerant recovery tank in a refrigerant recovery mode by an automatic operation by providing the tank in an outdoor unit. SOLUTION: A refrigerant tank Tnk is installed in a refrigerant tube in an outdoor unit A between an outdoor expansion valve Exp1 and an indoor expansion valve Exp2 via first two-way valve V1 and second two-way valve V2 in the heat pump type air conditioner, and suction pressure detecting means Prs for detecting the refrigerant pressure p1 of the suction side of a compressor 1 is installed. A refrigerant recovery controller cnt1 having a refrigerant recovery mode for closing the valve V2 and setting the outdoor blower 4 to the maximum mode and the indoor blower 8 to the maximum mode after the cooling operation is executed for a predetermined time τ and closing the valve V1 and stopping the compressor 1 when the suction pressure p1 becomes a predetermined pressure p0 or lower, and a refrigerant recovery operating unit Rmt are provided.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a refrigeration cycle control for performing a refrigerant recovery operation in a heat pump type air conditioner using air as a heat source.

[0002]

2. Description of the Related Art Heat pump type air conditioners are
Various developments have already been made, among which the basic technology of a general heat pump type air conditioner will be described below.

As shown in FIG. 8, the conventional heat pump type air conditioner comprises an outdoor unit Ao and an indoor unit Bo.

The outdoor unit Ao includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an outdoor blower 4, and an outdoor decompression device Ex.
p1, a first check valve 7a, an accumulator 6,
The indoor unit Bo is composed of an indoor heat exchanger 5, an indoor pressure reducing device Exp2, a first check valve 7a, and an indoor blower 8.

Then, the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the outdoor pressure reducing device Exp1, the indoor pressure reducing device Exp2,
The indoor heat exchanger 5 and the accumulator 6 are sequentially connected in an annular shape by a refrigerant pipe to form a refrigeration cycle.

The outdoor unit Ao and the indoor unit Bo are provided with pipe connection valves Va1, Va2, Vb1 and Vb2.
Through the refrigerant pipes P1 and P2.

The operation of the heat pump type air conditioner configured as described above will be described.

First, in the case of the cooling operation, the four-way valve 2 is switched to the cooling circuit, the refrigerant flows in the direction of the solid line arrow in the figure to form the cooling cycle, and the outdoor heat exchanger 3 is connected to the condenser and the indoor heat exchange. The vessel 5 acts as an evaporator.

In the cooling cycle, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is condensed in the outdoor heat exchanger 3 to become a high-temperature and high-pressure liquid refrigerant, and the outdoor unit Ao is discharged through the first check valve 7a. Exit, then flow into the indoor unit Bo,
The refrigerant that has been decompressed and expanded in the indoor decompression device Exp2 to become a two-phase refrigerant evaporates in the indoor heat exchanger 5 to absorb heat from the indoor air (cooling operation), and the cycle is repeated.

On the other hand, in the heating operation, the four-way valve 2 is switched to the heating circuit, the refrigerant flows in the direction of the broken line arrow in the figure to form the heating cycle, and the indoor heat exchanger 5 is replaced with the condenser and the outdoor heat exchanger. The vessel 3 acts as an evaporator.

In the heating cycle, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is condensed in the indoor heat exchanger 5 to radiate heat to indoor air (heating operation) to become a high-temperature and high-pressure liquid refrigerant. The refrigerant that has left the indoor unit B via the check valve 7b, then flows into the outdoor unit Ao, and is decompressed and expanded by the outdoor decompression device Exp1 to become a two-phase refrigerant is evaporated by the outdoor heat exchanger 3. By doing so, the cycle of absorbing heat from the outdoor air is repeated.

[0012]

However, the above-mentioned conventional configuration is different from the outdoor unit Ao and the indoor unit B.
o is a pipe connection valve Va1, Va that requires manual operation.
Refrigerant pipes Pipe1, Pi through 2, Vb1, Vb2
Since they are communicated by pe2, it is difficult to recover the refrigerant in the refrigeration cycle when the air conditioner is removed or the refrigerant piping system is repaired or modified.

That is, in the case of performing the refrigerant recovery, while performing the cooling operation, the pipe connection valve Va1 is manually closed in the outdoor unit Ao, and the pressure on the suction side of the compressor is monitored by a pressure gauge or the like, and the predetermined pressure is maintained. Connection valve Va2
There is a drawback that a laborious operation of turning off the power source by the remote controller in the indoor unit Ao is required to close the compressor and then to stop the compressor.

Further, in this case, it is the entire outdoor unit Ao that can recover the refrigerant, and when a part of the refrigerant pipe in the outdoor unit Ao is repaired or modified, a separate refrigerant recovery device is used, or Eventually, it was released into the atmosphere, which had the drawback of becoming a major problem in terms of protecting the global environment.

Therefore, the present invention solves the conventional problems, and a heat pump type air is provided which has a refrigerant recovery tank in the outdoor unit and can automatically recover the refrigerant in the refrigerant recovery tank in the refrigerant recovery mode. The purpose is to provide a harmony machine.

[0016]

[Means for Solving the Problems] The technical means of the present invention for achieving the above object is a compressor, a four-way valve, an outdoor heat exchanger, an outdoor pressure reducing device, an indoor pressure reducing device, an indoor heat exchanger, a four-way valve. In the refrigeration cycle in which the refrigerant is sequentially connected in an annular shape by a refrigerant pipe, a first two-way valve and a second two-way valve are provided between the outdoor decompression device and the indoor decompression device and in the refrigerant pipe in the outdoor unit. A refrigerant tank is installed therethrough, suction pressure detection means for detecting the refrigerant pressure on the suction side of the compressor is installed, and after the cooling operation is performed for a predetermined time, the second two-way valve is closed and the outdoor blower is set to the maximum mode, When the indoor blower is set to the maximum mode and the refrigerant pressure detected by the suction pressure detection means becomes equal to or lower than the predetermined pressure, the first
A refrigerant recovery control device having a refrigerant recovery mode in which the two-way valve is closed and the compressor is stopped, and a refrigerant recovery operation device are provided.

Further, after the heating operation is performed for a predetermined time, the first two-way valve is closed, the outdoor blower is set to the maximum mode, the indoor blower is set to the maximum mode, and when the refrigerant pressure by the suction pressure detecting means becomes equal to or lower than the predetermined pressure, The second refrigerant recovery control device has a refrigerant recovery mode in which the two-way valve is closed and the compressor is stopped, and the refrigerant recovery operation device.

Further, there are provided an outside air temperature detecting means for detecting an outside air temperature and an indoor air temperature detecting means for detecting an indoor temperature,
When the outside air temperature is lower than or equal to a predetermined temperature and the indoor temperature is higher than or equal to a predetermined temperature, a refrigerant recovery operation is performed in the refrigerant tank after performing a heating operation, and the outside air temperature other than the temperature conditions and the indoor temperature are cooled. A third refrigerant recovery control device that performs a refrigerant recovery operation to the refrigerant tank after performing the operation is provided.

Furthermore, the refrigerant tank is installed below any other component in the outdoor unit.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION In the invention described in claim 1 of the present invention, when the refrigerant recovery mode operation is performed by the start operation of the refrigerant recovery mode operation device during the cooling operation period, first, after performing the cooling operation for a predetermined time, The second installed on the refrigerant tank outlet side
By closing a part of the annular refrigerant circuit by closing the two-way valve, the gas refrigerant discharged from the compressor is condensed in the outdoor heat exchanger and becomes liquid refrigerant, which accumulates in the refrigerant tank. Put in.

At this time, the outdoor blower is set to the maximum mode, the condensing capacity of the outdoor heat exchanger is maximized, and the indoor blower is set to the maximum mode to suppress the decrease of the suction pressure of the compressor.

On the other hand, the amount of refrigerant returning from the indoor heat exchanger to the compressor gradually decreases because the second two-way valve on the refrigerant tank outlet side closes the refrigerant circuit, and the compressor suction pressure increases. If the compressor continues to operate as it is, the vacuum operation, that is, the suction pressure of the compressor becomes equal to or lower than the atmospheric pressure.

Therefore, when the pressure falls below a predetermined pressure in consideration of the operational reliability of the compressor, the first two-way valve on the inlet side of the refrigerant tank is closed to separate the refrigerant tank from the refrigerant circuit and then the operation of the compressor is stopped. Control collection.

As a result, the CFC refrigerant in the refrigerant circuit at the time of removal or modification of the air conditioner can be easily and automatically recovered in the refrigerant recovery tank, and the refrigerant tank can be separated from the air conditioner to be recovered. The refrigerant can be used for other purposes.

According to the second aspect of the invention, when the refrigerant recovery mode operation is performed by the start operation of the refrigerant recovery mode operation device during the heating operation period, similarly, after the heating operation is performed for a predetermined time, the refrigerant tank By closing the first two-way valve installed on the outlet side to close a part of the annular refrigerant circuit, the gas refrigerant discharged from the compressor is condensed in the indoor heat exchanger and becomes liquid refrigerant. Accumulates in the refrigerant tank.

At this time, the indoor blower is set to the maximum mode, the condensing capacity of the indoor heat exchanger is maximized, and the outdoor blower is set to the maximum mode to prevent the suction pressure of the compressor from decreasing.

On the other hand, the amount of refrigerant returning from the outdoor heat exchanger to the compressor gradually decreases, as in the case of the cooling operation, because the refrigerant circuit is closed by the first two-way valve on the refrigerant tank outlet side. Along with this, the suction pressure of the compressor also decreases, and if the operation of the compressor is continued as it is, the vacuum operation, that is, the suction pressure of the compressor becomes below atmospheric pressure.

Therefore, when the pressure falls below a predetermined pressure in consideration of the operational reliability of the compressor, the second two-way valve on the refrigerant tank inlet side is closed to separate the refrigerant tank from the refrigerant circuit and then the compressor operation is stopped. Control collection.

As a result, as in the case of the cooling operation, the CFC refrigerant in the refrigerant circuit at the time of removing or modifying the air conditioner can be easily and automatically recovered in the refrigerant recovery tank, and the refrigerant tank can be separated from the air conditioner. By making it possible, the recovered refrigerant can be used for other purposes.

According to the third aspect of the present invention, the third refrigerant recovery control device is installed so that the outside air temperature around the outdoor unit is at a predetermined temperature during the refrigerant recovery operation in the intermediate period between the cooling operation and the heating operation. In the following, if the indoor temperature around the indoor unit is equal to or higher than a predetermined temperature, perform a refrigerant recovery operation to the refrigerant tank after performing a heating operation, outside air temperature other than the temperature conditions, and in the case of indoor temperature, After performing the cooling operation, the refrigerant recovery operation to the refrigerant tank is performed.

Therefore, when the refrigeration cycle operation is performed, the refrigerant recovery operation can be performed after satisfying the air condition in consideration of the operational reliability of the compressor, so that the refrigerant recovery efficiency is high.
Moreover, it is possible to avoid overload operation of the compressor and maintain device reliability.

According to a fourth aspect of the present invention, the liquid refrigerant staying in the outdoor heat exchanger or the refrigerant pipe is provided by installing the refrigerant tank below any other component in the outdoor unit. Can be easily collected by the action of gravity.

Embodiments of a heat pump type air conditioner according to the present invention will be described below with reference to the drawings. The same components as those of the conventional example are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment 1) FIG. 1 is a refrigeration cycle diagram of a heat pump type air conditioner according to Embodiment 1 of the present invention. In FIG. 1, the heat pump type air conditioner includes an outdoor unit A and an indoor unit B.

The outdoor unit A includes a compressor 1, a four-way valve 2,
The outdoor heat exchanger 3, the outdoor blower 4, the outdoor expansion valve Exp1,
It is composed of a refrigerant tank Tnk and an accumulator 6,
The indoor unit B includes an indoor heat exchanger 5, an outdoor blower 8, and an indoor expansion valve Exp2.

The refrigerant tank Tnk is an outdoor expansion valve Exp.
1 between the indoor expansion valve Exp2 and the outdoor unit A
A first two-way valve V1 and a second two-way valve V2 in the refrigerant pipe inside
The suction pressure detecting means Prs for detecting the refrigerant pressure is installed in the suction pipe of the compressor 1. Further, in the outdoor unit A, a refrigerant recovery operation device Rmt, which is a start switch of a refrigerant recovery mode, and a first
A refrigerant recovery control device Cnt1 is provided.

The operation of the heat pump type air conditioner constructed as described above will be described below. The operation in this case is performed according to the flowchart shown in FIG.

At step 1, when the refrigerant recovery mode is turned on by the refrigerant recovery operation device Rmt, the cooling operation is started, that is, the four-way valve 2 switches to the cooling circuit, and the refrigerant flows in the direction of the solid line arrow in the figure. A cooling cycle is formed, and the outdoor heat exchanger 3 acts as a condenser and the indoor heat exchanger 5 acts as an evaporator.

In the cooling cycle, the high-temperature and high-pressure gas refrigerant that has exited the compressor 1 is condensed in the outdoor heat exchanger 3 to become a high-temperature and high-pressure liquid refrigerant, and the opening degree of the outdoor expansion valve Exp1 is set to be fully open. Therefore, the outdoor unit A remains as high-pressure liquid refrigerant.
From the indoor air to the indoor unit B to be decompressed and expanded by the indoor expansion valve Exp2 into a two-phase refrigerant, which is evaporated in the indoor heat exchanger 5 to absorb heat from the indoor air (cooling operation).

Then, when the elapsed operation time τ of the cooling operation reaches the predetermined time τ1 by the control of the first refrigerant recovery control device Cnt1 at step 2, the second two-way installed on the outlet side of the refrigerant tank Tnk at step 3 is performed. By closing a part of the annular refrigerant circuit by closing the valve V2, the gas refrigerant discharged from the compressor 1 is transferred to the outdoor heat exchanger 3
Is condensed and becomes a liquid refrigerant and accumulates in the refrigerant tank Tnk. At this time, in step 4, the outdoor blower 4 is set to the maximum mode, the condensing capacity of the outdoor heat exchanger 3 is maximized, and the indoor blower 8 is set to the maximum mode to suppress the decrease of the suction pressure p1 of the compressor 1.

On the other hand, the amount of refrigerant returning from the indoor heat exchanger 5 to the compressor 1 gradually decreases because the second two-way valve V2 on the outlet side of the refrigerant tank Tnk closes the refrigerant circuit. The suction pressure p1 detected by the suction pressure detection means Prs of the suction pipe of the compressor 1 also decreases, and if the operation of the compressor 1 is continued as it is, the vacuum operation, that is, the suction pressure of the compressor becomes equal to or lower than the atmospheric pressure. .

Therefore, when the suction pressure p1 of the compressor 1 becomes equal to or lower than the predetermined pressure p0 in consideration of operational reliability in step 5, the first two-way valve V1 on the inlet side of the refrigerant tank Tnk is closed in step 6 to close the refrigerant tank Tnk. After separating from the refrigerant circuit, the operation of the compressor 1, the outdoor blower 4 and the indoor blower 8 is stopped at step 7.

As a result, the Freon refrigerant in the refrigerant circuit at the time of removing or modifying the air conditioner can be easily and automatically recovered in the refrigerant tank Tnk, and the refrigerant tank Tnk can be separated from the outdoor unit A to recover the refrigerant. The chlorofluorocarbon refrigerant can be used for other purposes.

(Second Embodiment) FIG. 3 is a refrigeration cycle diagram of a heat pump type air conditioner according to a second embodiment of the present invention. In FIG. 3, the heat pump type air conditioner is composed of an outdoor unit A ′ and an indoor unit B.

The outdoor unit A'is the first refrigerant recovery control device Cnt1 in the outdoor unit A shown in the first embodiment.
Has the same configuration as the outdoor unit A except that the second refrigerant recovery control device Cnt2.

The operation of the heat pump type air conditioner configured as described above will be described below. The operation in this case is performed according to the flowchart shown in FIG.

When the refrigerant recovery mode is turned on in the refrigerant recovery operation device Rmt, the heating operation is started in step 1, that is, the four-way valve 2 switches to the heating circuit, and the refrigerant flows in the direction of the white arrow in the figure. As a result, a heating cycle is formed, and the indoor heat exchanger 5 acts as a condenser and the outdoor heat exchanger 3 acts as an evaporator.

In the above heating cycle, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is condensed in the indoor heat exchanger 5 and becomes the high-temperature and high-pressure liquid refrigerant by performing the heating operation, and the opening degree of the indoor expansion valve Exp2. Is set to be fully opened, so that the high-pressure liquid refrigerant exits the indoor unit B as it is, flows into the outdoor unit A ′, is decompressed and expanded by the outdoor expansion valve Exp1, becomes a two-phase refrigerant, and is evaporated in the outdoor heat exchanger 3. This absorbs heat from the outdoor air.

Then, when the operation elapsed time τ of the heating operation reaches the predetermined time τ2 in step 2 under the control of the second refrigerant recovery control device Cnt2, in step 3, the first two-way installed on the outlet side of the refrigerant tank Tnk. By closing the valve V1 to close a part of the annular refrigerant circuit, the gas refrigerant discharged from the compressor 1 is transferred to the indoor heat exchanger 5
Is condensed and becomes a liquid refrigerant and accumulates in the refrigerant tank Tnk. At this time, in step 4, the indoor blower 8 is set to the maximum mode, the condensing capacity of the indoor heat exchanger 3 is maximized, and the outdoor blower 4 is set to the maximum mode to suppress the decrease of the suction pressure p1 of the compressor 1.

On the other hand, the amount of refrigerant returning from the outdoor heat exchanger 3 to the compressor 1 gradually decreases as the refrigerant circuit is closed by the first two-way valve V1 on the outlet side of the refrigerant tank Tnk. The suction pressure p1 detected by the suction pressure detection means Prs of the suction pipe of the compressor 1 also decreases, and if the operation of the compressor 1 is continued as it is, the vacuum operation, that is, the suction pressure of the compressor becomes equal to or lower than the atmospheric pressure. .

Therefore, when the suction pressure p1 of the compressor 1 becomes equal to or lower than the predetermined pressure p0 in consideration of operational reliability in step 5, the second two-way valve V2 on the inlet side of the refrigerant tank Tnk is closed and the refrigerant tank Tnk in step 6. After separating from the refrigerant circuit, the operation of the compressor 1, the outdoor blower 4 and the indoor blower 8 is stopped at step 7.

As a result, the CFC refrigerant in the refrigerant circuit at the time of removing or modifying the air conditioner can be easily and automatically recovered in the refrigerant tank Tnk, and the refrigerant tank Tnk can be used as the outdoor unit A '.
By making it more detachable, the recovered CFC refrigerant can be used for other purposes.

(Embodiment 3) FIG. 5 is a refrigeration cycle diagram of a heat pump type air conditioner according to Embodiment 3 of the present invention. In FIG. 5, the heat pump type air conditioner includes an outdoor unit A ″ and an indoor unit B ′.

The outdoor unit A ″ is different from the outdoor unit A shown in the first embodiment in that the outdoor air temperature detecting means Th1 for detecting the outdoor air temperature and the third refrigerant recovery control device Cnt.
3 has the same configuration as the outdoor unit A except that the first refrigerant recovery control device Cnt1 is a third refrigerant recovery control device Cnt3. Further, the indoor unit B ′ is different from the indoor unit B shown in the first embodiment except that the indoor temperature detecting means Th2 for detecting the indoor temperature is provided.
It has the same structure as.

The operation of the heat pump type air conditioner configured as described above will be described below. The operation in this case is performed according to the flowchart shown in FIG.

At step 1, the outside air temperature To around the outdoor unit A "by the outside air temperature detecting means Th1 and the indoor temperature Ti around the indoor unit B'by the indoor air temperature detecting means Th2 are detected to perform the heating operation. It is determined whether or not a predetermined condition is satisfied.

That is, in step 2, when the outside air temperature To is lower than the predetermined temperature T1 and the indoor temperature Ti is higher than the predetermined temperature T2 (however, T1≤T2), the heating operation is carried out and then the refrigerant tank is cooled. Perform refrigerant recovery operation. And
If the temperature condition is not satisfied in step 3, the cooling operation is performed and then the refrigerant recovery operation to the refrigerant tank is performed.

As a result, when the refrigeration cycle operation is performed, the operation mode satisfying the air condition considering the operation reliability of the compressor 1 can be automatically selected and the automatic refrigerant recovery operation can be performed, so that the refrigerant recovery efficiency is high, In addition, overload operation of the compressor 1 can be avoided, and device reliability can be maintained.

(Fourth Embodiment) FIG. 7 is a refrigeration cycle diagram of a heat pump type air conditioner of a fourth embodiment of the present invention. The configuration is the same as that of the third embodiment except the position of the refrigerant tank Tnk, and thus detailed description thereof will be omitted.

The heat pump type air conditioner shown in FIG. 7 is installed in the outdoor unit A ″ at a position where the refrigerant tank Tnk is lower than any other component.

As a result, the CFC refrigerant in the refrigerant circuit can be easily and automatically recovered in the refrigerant tank Tnk, and the liquid refrigerant remaining in the outdoor heat exchanger 3 and the refrigerant pipe can be recovered by the action of gravity. Can be made easier.

[0062]

As described above, according to the present invention, the refrigerant is provided between the outdoor pressure reducing device and the indoor pressure reducing device and in the refrigerant pipe in the outdoor unit via the first two-way valve and the second two-way valve. After the tank is installed, the suction pressure detection means for detecting the refrigerant pressure on the suction side of the compressor is installed, and after the cooling operation is performed for a predetermined time, the second
Refrigerant that closes the first two-way valve and stops the compressor when the two-way valve is closed, the outdoor blower is in the maximum mode, the indoor blower is in the maximum mode, and the refrigerant pressure by the suction pressure detection means is equal to or lower than a predetermined pressure. Since the refrigerant recovery control device having a recovery mode and the refrigerant recovery operation device are provided, it is possible to easily and automatically recover the CFC refrigerant in the refrigerant circuit during the removal or modification of the air conditioner into the refrigerant recovery tank. By making it detachable from the air conditioner, the recovered refrigerant can be used for other purposes.

After the heating operation is performed for a predetermined time, the first two-way valve is closed, the outdoor blower is set to the maximum mode, the indoor blower is set to the maximum mode, and when the refrigerant pressure by the suction pressure detection means becomes equal to or lower than the predetermined pressure, (2) Since the second refrigerant recovery control device having the refrigerant recovery mode for closing the two-way valve and stopping the compressor and the refrigerant recovery operation device are provided, the CFC in the refrigerant circuit at the time of removal or modification of the air conditioner The refrigerant can be easily and automatically recovered in the refrigerant recovery tank, and the refrigerant tank can be separated from the air conditioner, so that the recovered refrigerant can be used for other purposes.

Further, an outside air temperature detecting means for detecting the outside air temperature and an indoor air temperature detecting means for detecting the indoor temperature are provided, and the outside air temperature around the outdoor unit is a predetermined temperature or more and the indoor temperature around the indoor unit is a predetermined temperature or less. In the case of, after performing the cooling operation, perform the refrigerant recovery operation to the refrigerant tank,
A third refrigerant recovery control device that performs a refrigerant recovery operation to a refrigerant tank after performing a heating operation when the outside air temperature around the outdoor unit is equal to or lower than a predetermined temperature and the indoor temperature around the indoor unit is equal to or higher than a predetermined temperature, and Since the refrigerant recovery operation device is provided, when performing the refrigeration cycle operation, the refrigerant recovery operation can be performed after satisfying the air condition considering the operation reliability of the compressor, so that the refrigerant recovery efficiency is high and the compressor overload is achieved. Operation can be avoided and equipment reliability can be maintained.

Furthermore, in the outdoor unit, the position of the refrigerant tank is set lower than any other component. Liquid refrigerant accumulated in the outdoor heat exchanger and the refrigerant pipe can be easily collected by the action of gravity.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of a first embodiment of a heat pump type air conditioner according to the present invention.

FIG. 2 is a flowchart showing operation control contents of the heat pump type air conditioner according to the same embodiment.

FIG. 3 is a refrigeration cycle diagram of the second embodiment of the heat pump type air conditioner according to the present invention.

FIG. 4 is a flowchart showing operation control contents of the heat pump type air conditioner according to the same embodiment.

FIG. 5 is a refrigeration cycle diagram of a third embodiment of the heat pump type air conditioner according to the present invention.

FIG. 6 is a flowchart showing the operation control contents of the heat pump type air conditioner according to the same embodiment.

FIG. 7 is a refrigeration cycle diagram of a fourth embodiment of the heat pump type air conditioner according to the present invention.

FIG. 8 is a refrigeration cycle diagram of a conventional heat pump type air conditioner.

[Explanation of symbols]

 1 compressor 2 4-way valve 3 outdoor heat exchanger 4 outdoor blower 5 indoor expansion valve 6 accumulator 7 indoor blower Exp1 outdoor expansion valve Exp2 indoor expansion valve V1 first two-way valve V2 second two-way valve Prs suction pressure detection means Cnt1 first 1 Expansion valve control device Cnt2 Second expansion valve control device Cnt3 Third expansion valve control device Rmt Refrigerant recovery operation device Th1 Outside air temperature detection means Th2 Indoor temperature detection means A, A ', A "Outdoor unit B, B' Indoor unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Takamoto Motoharu 4-2-5 Takaidahondori, Higashi-Osaka City, Osaka Prefecture Matsushita Cold Machinery Co., Ltd.

Claims (4)

[Claims] 1. An outdoor unit including a compressor, a four-way valve, an outdoor heat exchanger, an outdoor pressure reducing device, and an outdoor blower, and an indoor unit including an indoor pressure reducing device, an indoor heat exchanger, and an indoor blower, And the compressor, four-way valve, outdoor heat exchanger, outdoor decompressor, indoor decompressor, indoor heat exchanger,
In a refrigeration cycle in which four-way valves are sequentially connected in a ring by a refrigerant pipe, between the outdoor decompression device and the indoor decompression device,
In addition, a refrigerant tank is installed in the refrigerant pipe in the outdoor unit via the first two-way valve and the second two-way valve, and suction pressure detection means for detecting the refrigerant pressure on the suction side of the compressor is installed to perform cooling operation. After a predetermined time, the second two-way valve is closed, the outdoor blower is set to the maximum mode, the indoor blower is set to the maximum mode, and the first two-way valve is closed when the refrigerant pressure by the suction pressure detection means is equal to or lower than the predetermined pressure. A heat pump type air conditioner including a first refrigerant recovery control device having a refrigerant recovery mode for stopping the compressor, and a refrigerant recovery operation device. 2. An outdoor unit including a compressor, a four-way valve, an outdoor heat exchanger, an outdoor pressure reducing device, and an outdoor blower, and an indoor unit including an indoor pressure reducing device, an indoor heat exchanger, and an indoor blower, And the compressor, four-way valve, outdoor heat exchanger, outdoor decompressor, indoor decompressor, indoor heat exchanger,
In a refrigeration cycle in which four-way valves are sequentially connected in a ring by a refrigerant pipe, between the outdoor decompression device and the indoor decompression device,
In addition, a refrigerant tank is installed in the refrigerant pipe in the outdoor unit via the first two-way valve and the second two-way valve, and suction pressure detection means for detecting the refrigerant pressure on the suction side of the compressor is installed to perform heating operation. After a predetermined time, the first two-way valve is closed, the outdoor blower is set to the maximum mode, the indoor blower is set to the maximum mode, and when the refrigerant pressure detected by the suction pressure detection means is equal to or lower than the predetermined pressure, the second
A heat pump type air conditioner comprising a second refrigerant recovery control device having a refrigerant recovery mode for closing a two-way valve and stopping a compressor, and a refrigerant recovery operation device. 3. An outdoor unit including a compressor, a four-way valve, an outdoor heat exchanger, an outdoor pressure reducing device, and an outdoor blower, and an indoor unit including an indoor pressure reducing device, an indoor heat exchanger, and an indoor blower, And the compressor, four-way valve, outdoor heat exchanger, outdoor decompressor, indoor decompressor, indoor heat exchanger,
In a refrigeration cycle in which four-way valves are sequentially connected in a ring by a refrigerant pipe, between the outdoor decompression device and the indoor decompression device,
In addition, a refrigerant tank is installed in the refrigerant pipe in the outdoor unit via the first two-way valve and the second two-way valve, and suction pressure detection means for detecting the refrigerant pressure on the suction side of the compressor is installed. The indoor unit has an outdoor air temperature detecting means for detecting the outdoor air temperature, and the indoor unit has an indoor air temperature detecting means for detecting the indoor temperature.When the outdoor air temperature is equal to or lower than a predetermined temperature and the indoor temperature is equal to or higher than the predetermined temperature, the heating operation is performed. After carrying out for a predetermined time, the first two-way valve is closed, the outdoor blower is set to the maximum mode, the indoor blower is set to the maximum mode, and when the refrigerant pressure by the suction pressure detection means becomes equal to or lower than the predetermined pressure, the second two-way valve is closed, In addition, in the refrigerant recovery mode in which the compressor is stopped, and the outside air temperature and the indoor temperature other than the above, after performing the cooling operation for a predetermined time, the second two-way valve is closed, the outdoor blower is in the maximum mode, and the indoor blower is set to the maximum. Mode and A third refrigerant recovery control device having a refrigerant recovery mode in which the first two-way valve is closed and the compressor is stopped when the refrigerant pressure by the suction pressure detection means becomes equal to or lower than a predetermined pressure, and a refrigerant recovery operation device. Heat pump type air conditioner. 4. The heat pump type air conditioner according to claim 1, 2, or 3, wherein the refrigerant tank is installed below any other component in the outdoor unit.