JP2845786B2 - Heat pump type air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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 them, the basic technology of a general heat pump air conditioner will be described below.

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

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

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

The outdoor unit Ao and the indoor unit Bo are connected to pipe connection valves Va1, Va2, Vb1, 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 cooling circuit is switched to the cooling circuit by the four-way valve 2, the refrigerant flows in the direction of the solid line arrow in the drawing to form a 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 above cooling cycle, the high-temperature and high-pressure gas refrigerant exiting the compressor 1 is condensed in the outdoor heat exchanger 3 to become a high-temperature and high-pressure liquid refrigerant, and is transmitted to the outdoor unit Ao via the first check valve 7a. Exits, then flows into the indoor unit Bo,
The refrigerant that has been decompressed and expanded by the indoor decompression device Exp2 to become a two-phase refrigerant evaporates in the indoor heat exchanger 5 and absorbs heat from the indoor air (cooling operation).

On the other hand, in the heating operation, the heating circuit is switched by the four-way valve 2 and the refrigerant flows in the direction of the dashed arrow in the drawing to form a heating cycle, and the indoor heat exchanger 5 is connected to the condenser and the outdoor heat exchanger. The vessel 3 acts as an evaporator.

In the above-described heating cycle, the high-temperature and high-pressure gas refrigerant that has exited the compressor 1 is condensed in the indoor heat exchanger 5 to radiate heat (heating operation) to room air to become a high-temperature and high-pressure liquid refrigerant. The refrigerant that exits 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 in the outdoor heat exchanger 3. By doing so, a cycle of absorbing heat from outdoor air is repeated.

[0012]

However, the above-described conventional structure has an outdoor unit Ao and an indoor unit B.
o are pipe connection valves Va1 and Va requiring manual operation.
2, refrigerant pipes Pipe1, Pi via Vb1, Vb2
Since the communication is performed at pe2, it is difficult to collect the refrigerant in the refrigeration cycle when removing the air conditioner or repairing or modifying the refrigerant piping system.

That is, when recovering the refrigerant, while performing the cooling operation, the outdoor unit Ao manually closes the pipe connection valve Va1 and monitors the compressor suction side pressure with a pressure gauge or the like. When the pressure reaches pipe connection valve Va2
To shut off the compressor and then turn off the power with the remote controller in the indoor unit Ao, which has the disadvantage of requiring a troublesome operation.

Furthermore, in this case, the refrigerant can be recovered from the entire outdoor unit Ao. When a part of the refrigerant pipe in the outdoor unit Ao is repaired or remodeled, a separate refrigerant recovery device is used, or Eventually, it was released into the atmosphere, which had a drawback that it became a major problem in protecting the global environment.

In view of the above, the present invention has been made to solve the conventional problems, and has a refrigerant recovery tank in an outdoor unit, and a heat pump type air that can automatically recover refrigerant in the refrigerant recovery tank in a refrigerant recovery mode. It aims at providing a harmony machine.

[0016]

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 decompression device, an indoor decompression device, an indoor heat exchanger, a four-way valve. , In a refrigeration cycle in which a refrigerant pipe is sequentially connected in an annular manner, between an outdoor decompression device and an indoor decompression device, and a first two-way valve and a second two-way valve in a refrigerant pipe in an outdoor unit. A refrigerant tank is installed, and suction pressure detecting means for detecting the refrigerant pressure on the compressor suction side is installed.After performing the cooling operation 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 detecting means falls below a predetermined pressure,
A refrigerant recovery control device having a refrigerant recovery mode for closing the two-way valve and stopping the compressor, and a refrigerant recovery operation device.

After the heating operation has been performed for a predetermined time, the first two-way valve is closed, the outdoor blower is set to the maximum mode, and the indoor blower is set to the maximum mode. 2 A second refrigerant recovery control device having a refrigerant recovery mode for closing the two-way valve and stopping the compressor, and a refrigerant recovery operation device.

The apparatus further includes 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 equal to or lower than the predetermined temperature and the indoor temperature is equal to or higher than the predetermined temperature, a refrigerant recovery operation to the refrigerant tank is performed after performing the heating operation, and in the case of the outdoor air temperature other than the temperature condition and the indoor temperature, the cooling operation is performed. It is provided with a third refrigerant recovery control device that performs a refrigerant recovery operation to the refrigerant tank after performing the operation.

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

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that, when the refrigerant recovery mode operation is performed by starting the refrigerant recovery mode operation device during the cooling operation period, the cooling operation is first performed for a predetermined time, The second installed on the refrigerant tank outlet side
By closing the 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 a 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 a decrease in the suction pressure of the compressor.

On the other hand, the amount of the refrigerant returning from the indoor heat exchanger to the compressor gradually decreases because the refrigerant circuit is closed by the second two-way valve on the refrigerant tank outlet side, and the compressor suction pressure also decreases. If the operation of the compressor is continued as it is, vacuum operation, that is, the compressor suction pressure will be lower than the atmospheric pressure.

Accordingly, when the pressure becomes equal to or lower than a predetermined pressure in consideration of the operation 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. Perform collection control.

As a result, Freon 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 recover the refrigerant. The refrigerant can be used for other purposes.

[0025] Further, 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, the heating operation is performed for a predetermined time, and then the refrigerant tank is operated. By closing a part of the annular refrigerant circuit by closing the first two-way valve installed on the outlet side, the gas refrigerant discharged from the compressor is condensed by the indoor heat exchanger and becomes liquid refrigerant. And 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 suppress a decrease in the suction pressure of the compressor.

On the other hand, the amount of refrigerant returning from the outdoor heat exchanger to the compressor gradually decreases as in the case of cooling operation because the refrigerant circuit is closed by the first two-way valve on the refrigerant tank outlet side. As the pressure increases, the compressor suction pressure also decreases. If the operation of the compressor is continued, the vacuum operation, that is, the compressor suction pressure becomes lower than the atmospheric pressure.

Therefore, when the pressure becomes equal to or lower than a predetermined pressure in consideration of the operational reliability of the compressor, the refrigerant is stopped by closing the second two-way valve on the inlet side of the refrigerant tank and separating the refrigerant tank from the refrigerant circuit. Perform collection control.

As a result, as in the case of the cooling operation, the refrigerant in the refrigerant circuit when the air conditioner is removed or remodeled 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 collected refrigerant can be used for other purposes.

According to a third aspect of the present invention, with the provision of the third refrigerant recovery control device, the outside air temperature around the outdoor unit is kept at a predetermined temperature during the refrigerant recovery operation in an intermediate period between the cooling operation and the heating operation. Below, and when 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, and in the case of an outside air temperature other than the temperature condition, and an indoor temperature, After performing the cooling operation, a refrigerant recovery operation to the refrigerant tank is performed.

Therefore, when performing the refrigeration cycle operation, the refrigerant recovery operation can be performed while satisfying the air conditions in consideration of the operational reliability of the compressor, so that the refrigerant recovery efficiency is high.
In addition, overload operation of the compressor can be avoided, and device reliability can be maintained.

According to a fourth aspect of the present invention, the liquid refrigerant remaining 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 recovered by the action of gravity.

An embodiment 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,
An outdoor heat exchanger 3, an outdoor blower 4, an 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 provided with an outdoor expansion valve Exp.
1 and the indoor expansion valve Exp2, and the outdoor unit A
A first two-way valve V1 and a second two-way valve V2
The compressor 1 has a suction pipe provided with suction pressure detecting means Prs for detecting a refrigerant pressure. In the outdoor unit A, a refrigerant recovery operating device Rmt, which is a switch for starting a refrigerant recovery mode, and a first refrigerant recovery operation device Rmt.
A refrigerant recovery control device Cnt1 is provided.

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 by the refrigerant recovery operating device Rmt in step 1, the cooling operation is started, that is, the operation is switched to the cooling circuit by the four-way valve 2, and the refrigerant flows in the direction of the solid line arrow in the drawing. 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 above 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 of the outdoor expansion valve Exp1 is set to fully open. For this reason, the outdoor unit A
And flows into the indoor unit B, is decompressed and expanded by the indoor expansion valve Exp2, becomes a two-phase refrigerant, and evaporates in the indoor heat exchanger 5 to absorb heat from the indoor air (cooling operation).

When the operation elapsed time τ of the cooling operation reaches the predetermined time τ1 under the control of the first refrigerant recovery control device Cnt1 in step 2, the second side installed at the outlet side of the refrigerant tank Tnk in step 3 By closing a part of the annular refrigerant circuit by closing the valve V2, the gas refrigerant discharged from the compressor 1 is discharged from 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 a decrease in 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 refrigerant circuit is closed by the second two-way valve V2 at the outlet 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 compressor suction pressure becomes lower than the atmospheric pressure. .

Accordingly, when the suction pressure p1 of the compressor 1 becomes equal to or lower than the predetermined pressure p0 in consideration of the 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, and the refrigerant tank Tnk is closed. Is separated from the refrigerant circuit, the operation of the compressor 1, the outdoor blower 4, and the indoor blower 8 is stopped in step 7.

As a result, the Freon refrigerant in the refrigerant circuit when the air conditioner is removed or remodeled can be easily and automatically recovered in the refrigerant tank Tnk, and the refrigerant tank Tnk can be separated from the outdoor unit A, thereby recovering the refrigerant. The used Freon refrigerant can be used for other purposes.

(Embodiment 2) FIG. 3 is a refrigeration cycle diagram of a heat pump type air conditioner according to Embodiment 2 of the present invention. In FIG. 3, the heat pump air conditioner includes an outdoor unit A ′ and an indoor unit B.

The outdoor unit A 'is provided with 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 unit becomes 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 by the refrigerant recovery operating device Rmt, the heating operation is started in step 1, ie, the heating circuit is switched to the heating circuit by the four-way valve 2, and the refrigerant flows in the direction of the white arrow in the figure. Thus, 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 heating cycle, the high-temperature and high-pressure gas refrigerant that has exited the compressor 1 is condensed in the indoor heat exchanger 5 to perform a heating operation to become a high-temperature and high-pressure liquid refrigerant, and the opening degree of the indoor expansion valve Exp2 is increased. Is set to be fully open, it leaves the indoor unit B with the high-pressure liquid refrigerant, flows into the outdoor unit A ′, is decompressed and expanded by the outdoor expansion valve Exp1, becomes a two-phase refrigerant, and evaporates in the outdoor heat exchanger 3. This absorbs heat from outdoor air.

Under the control of the second refrigerant recovery control device Cnt2, when the operation elapsed time τ of the heating operation reaches a predetermined time τ2 at step 2, the first two-way motor installed at the outlet side of the refrigerant tank Tnk at step 3 By closing a part of the annular refrigerant circuit by closing the valve V 1, the gas refrigerant discharged from the compressor 1 is cooled by 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 a decrease in 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 because 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 compressor suction pressure becomes lower than the atmospheric pressure. .

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

As a result, Freon refrigerant in the refrigerant circuit when the air conditioner is removed or remodeled can be easily and automatically collected in the refrigerant tank Tnk, and the refrigerant tank Tnk can be removed from the outdoor unit A ′.
By making it more separable, the collected Freon 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 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 an outdoor air temperature detecting means Th1 for detecting an outdoor air temperature and a third refrigerant recovery control device Cnt
3 and has the same configuration as the outdoor unit A except that the first refrigerant recovery control device Cnt1 becomes the third refrigerant recovery control device Cnt3. The indoor unit B ′ is different from the indoor unit B shown in the first embodiment in that the indoor unit B ′ is provided with an indoor air temperature detecting means Th2 for detecting an indoor temperature.
It has the same configuration 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 detection means Th1 and the room temperature Ti around the indoor unit B ′ by the room temperature detection means Th2 are detected to perform the heating operation. It is determined whether a predetermined condition is satisfied.

That is, in step 2, when the outside air temperature To is equal to or lower than the predetermined temperature T1 and the room temperature Ti is equal to or higher than the predetermined temperature T2 (T1 ≦ T2), after the heating operation is performed, the refrigerant is transferred to the refrigerant tank. Perform refrigerant recovery operation. And
When 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 performing the refrigeration cycle operation, an operation mode that satisfies the air condition in consideration of the operation reliability of the compressor 1 can be automatically selected, and the automatic refrigerant recovery operation can be performed. In addition, overload operation of the compressor 1 can be avoided, and device reliability can be maintained.

(Embodiment 4) FIG. 7 is a refrigeration cycle diagram of a heat pump air conditioner according to Embodiment 4 of the present invention. The configuration is the same as that of the third embodiment except for the position of the refrigerant tank Tnk, and a detailed description thereof will be omitted.

In the heat pump type air conditioner shown in FIG. 7, in the outdoor unit A ″, the position of the refrigerant tank Tnk is installed at a position lower than any other components.

As a result, not only the fluorocarbon refrigerant in the refrigerant circuit can be easily and automatically recovered in the refrigerant tank Tnk, but also the liquid refrigerant remaining in the outdoor heat exchanger 3 and the refrigerant pipe is recovered by the action of gravity. It can be 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. A tank is installed, suction pressure detecting means for detecting the refrigerant pressure on the compressor suction side is installed, and after performing the cooling operation for a predetermined time, the second
When the 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 detecting means becomes equal to or lower than a predetermined pressure, the first two-way valve is closed and the compressor is stopped. Since a refrigerant recovery control device with a recovery mode and a refrigerant recovery operation device are provided, Freon refrigerant in the refrigerant circuit when the air conditioner is removed or remodeled can be easily and automatically recovered in the refrigerant recovery tank. By being able to be separated from the air conditioner, the collected refrigerant can be used for other purposes.

After the heating operation has been performed for a predetermined time, the first two-way valve is closed, the outdoor blower is set to the maximum mode, and the indoor blower is set to the maximum mode. (2) To provide a second 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, the CFCs in the refrigerant circuit when the air conditioner is removed or modified. The refrigerant can be easily and automatically recovered in the refrigerant recovery tank, and the refrigerant 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 an outside air temperature and an indoor air temperature detecting means for detecting an indoor temperature are provided, wherein the outside air temperature around the outdoor unit is higher than a predetermined temperature and the indoor temperature around the indoor unit is lower than a predetermined temperature. In the case of, performing the refrigerant recovery operation to the refrigerant tank after performing the cooling operation,
A third refrigerant recovery control device that performs a refrigerant recovery operation to the refrigerant tank after performing the heating operation, when the outside air temperature around the outdoor unit is equal to or lower than the predetermined temperature, and the indoor temperature around the indoor unit is equal to or higher than the 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 conditions in consideration of the operational reliability of the compressor, so that the refrigerant recovery efficiency is high and the compressor is overloaded. Operation can be avoided and equipment reliability can be maintained.

Further, in the outdoor unit, the position of the refrigerant tank is installed at a position lower than any other components. The liquid refrigerant remaining in the outdoor heat exchanger or 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 heat pump air conditioner according to a first embodiment of the present invention.

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

FIG. 3 is a refrigeration cycle diagram of Embodiment 2 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 embodiment.

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

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

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

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 compressor 2 four-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 2nd expansion valve control device Cnt3 3rd expansion valve control device Rmt Refrigerant recovery operation device Th1 outside air temperature detecting means Th2 indoor temperature detecting means A, A ', A "outdoor unit B, B' indoor unit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor ▲ Taka ▼ Motoharu Matsushita Refrigerating Machinery Co., Ltd. 4-5-2-5 Takaidahondori, Higashiosaka-shi, Osaka (58) Field surveyed (Int. Cl. ⁶ , (DB name) F25B 1/00 F25B 13/00

Claims (4)

(57) [Claims] 1. An outdoor unit comprising a compressor, a four-way valve, an outdoor heat exchanger, an outdoor decompression device and an outdoor blower, and an indoor unit comprising an indoor decompression device, an indoor heat exchanger and an indoor blower, And the compressor, a four-way valve, an outdoor heat exchanger, an outdoor decompression device, an indoor decompression device, an indoor heat exchanger,
In a refrigeration cycle in which four-way valves are sequentially connected in a ring by a refrigerant pipe, between an outdoor decompression device and an indoor decompression device,
And 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 detecting means for detecting the refrigerant pressure on the compressor suction side is installed. After performing for 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 when the refrigerant pressure by the suction pressure detecting means becomes equal to or lower than the predetermined pressure, the first two-way valve is closed. A heat pump air conditioner including a first refrigerant recovery control device having a refrigerant recovery mode for stopping a compressor, and a refrigerant recovery operation device. 2. An outdoor unit including a compressor, a four-way valve, an outdoor heat exchanger, an outdoor decompression device, and an outdoor blower; and an indoor unit including an indoor decompression device, an indoor heat exchanger, and an indoor blower, And the compressor, a four-way valve, an outdoor heat exchanger, an outdoor decompression device, an indoor decompression device, an indoor heat exchanger,
In a refrigeration cycle in which four-way valves are sequentially connected in a ring by a refrigerant pipe, between an outdoor decompression device and an 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 detecting means for detecting the refrigerant pressure on the suction side of the compressor is installed, and the heating operation is performed. Is performed for a predetermined time, the first two-way valve is closed, the outdoor blower is set to the maximum mode, and the indoor blower is set to the maximum mode.
A heat pump type air conditioner including a second refrigerant recovery control device having a refrigerant recovery mode in which a two-way valve is closed and a compressor is stopped, and a refrigerant recovery operation device. 3. An outdoor unit including a compressor, a four-way valve, an outdoor heat exchanger, an outdoor decompression device, and an outdoor blower, and an indoor unit including an indoor decompression device, an indoor heat exchanger, and an indoor blower, And the compressor, a four-way valve, an outdoor heat exchanger, an outdoor decompression device, an indoor decompression device, an indoor heat exchanger,
In a refrigeration cycle in which four-way valves are sequentially connected in a ring by a refrigerant pipe, between an outdoor decompression device and an indoor decompression device,
And 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 detecting means for detecting a refrigerant pressure on the compressor suction side is installed. The outdoor unit is provided with an outside air temperature detecting means for detecting an outside air temperature, and the indoor unit is provided with an indoor air temperature detecting means for detecting an indoor temperature. After performing for a predetermined time, the first two-way valve is closed, the outdoor blower is in the maximum mode, the indoor blower is in the maximum mode, and when the refrigerant pressure by the suction pressure detecting means is equal to or lower than a predetermined pressure, the second two-way valve is closed, And, in the case of the refrigerant recovery mode in which the compressor is stopped, and in the case of the outside air temperature other than the above, and the indoor temperature, 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 in the maximum. Mode A third refrigerant recovery control device having a refrigerant recovery mode for closing the first two-way valve and stopping the compressor when the refrigerant pressure by the suction pressure detecting 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, wherein the refrigerant tank is installed below any other component in the outdoor unit.