JPH1130459A - Refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the temperature reduction of refrigerant upon recovering the refrigerant and improve the recovering speed of refrigerant by a method wherein a refrigerant circuit is changed into refrigerant recovering mode and a refrigerant heating means, heating refrigerant in the refrigerant circuit, is operated. SOLUTION: An outdoor unit 2 is provided with a refrigerant recovering mode inputting means or a refrigerant recovering switch 101 while an indoor fan 3F and an outdoor fan 2F are operated by putting the refrigerant recovering switch 101 ON whereby liquid refrigerant, remaining in an indoor heat exchanger 31 and an outdoor heat exchanger 24, is heated by a heat source or air to promote the evaporation of liquid refrigerant and gasify the refrigerant. On the other hand, a crankcase heater 102, wound around a crankcase for a compressor, is excited when the refrigerant recovering switch 101 is put ON whereby the temperature of the compressor is increased and the evaporation of refrigerant, resolved in oil, is promoted. According to this method, the recovering speed of refrigerant can be quickened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an air conditioner,
The present invention relates to a refrigerating device such as a refrigerator and an ice machine.

[0002]

2. Description of the Related Art For example, there are a gas recovery system and a liquid recovery system as a system for recovering a refrigerant of an air conditioner.
The liquid recovery method has a higher recovery speed than the gas recovery method. However, it is rare that a port is installed in a liquid storage section of an air conditioner in the market, and in consideration of versatility, a gas recovery method has to be adopted at present. In this gas recovery method, a gas refrigerant of an air conditioner as a refrigerant recovery machine is absorbed by a compressor of the refrigerant recovery machine,
In this method, a gas refrigerant is condensed by a condenser provided on the discharge side of the compressor and stored in a recovery cylinder.

According to this gas recovery system, the air conditioner is depressurized by the compressor of the refrigerant recovery device, and the liquid refrigerant in the air conditioner evaporates. The evaporation of the liquid refrigerant takes heat of vaporization from the surroundings, and the temperature of the residual refrigerant gradually decreases. This decrease in the refrigerant temperature hinders the evaporation of the liquid refrigerant, so that there is a problem that the refrigerant recovery speed decreases.

[0004] Further, the above-mentioned decrease in the refrigerant temperature prolongs the vaporization time of the refrigerant dissolved in the refrigerating machine oil in the compressor,
Decrease the refrigerant recovery rate.

[0005]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a refrigeration apparatus capable of suppressing a decrease in refrigerant temperature during refrigerant recovery and improving a refrigerant recovery speed.

[0006]

According to a first aspect of the present invention, there is provided a refrigeration apparatus for heating a refrigerant in a refrigerant circuit, the refrigerant circuit being in a refrigerant recovery mode, and It is characterized by having a refrigerant recovery mode input means for operating the refrigerant heating means.

According to the first aspect of the present invention, when the refrigerant recovery mode input means is input, the refrigerant circuit is set to the refrigerant recovery mode, and the refrigerant heating means is operated to heat the refrigerant. Therefore, it is possible to prevent the liquid refrigerant from evaporating and evaporating due to the reduced pressure at the time of refrigerant recovery and to cool the residual refrigerant, thereby promoting the evaporation of the liquid refrigerant. Therefore, the refrigerant recovery speed can be improved.

According to a second aspect of the present invention, in the refrigeration system according to the first aspect, the refrigerant heating means supplies water to the indoor fan of the indoor heat exchanger, the outdoor fan of the outdoor heat exchanger, and the heat exchanger. It is characterized in that it is at least one of the circulation pumps for supplying.

According to a second aspect of the present invention, when the refrigerant recovery mode input means is input, at least one of an indoor fan of an indoor heat exchanger as a refrigerant heating means, an outdoor fan of an outdoor heat exchanger, and a circulation pump is provided. Run one. When the indoor and outdoor fans are operated, the liquid refrigerant remaining in the indoor and outdoor heat exchangers is heated by the heat source air and the temperature drop is suppressed, so that the refrigerant recovery speed can be increased. In addition, when the circulation pump is operated, the refrigerant in the heat exchanger is heated by the heat source water, and a decrease in the temperature of the refrigerant due to the refrigerant recovery is suppressed, so that the refrigerant recovery speed can be increased.

According to a third aspect of the present invention, in the refrigeration apparatus according to the first or second aspect, when the refrigerant recovery mode input means is input, power is supplied to a crankcase heater of the compressor and the compressor is driven. A compressor heating means for performing at least one of open phase energization of the motor to be operated and phase switching of energized electric power to the motor for driving the compressor to increase the temperature of the compressor.

According to a third aspect of the present invention, when the refrigerant recovery mode input means is input, the compressor heating means energizes a crankcase heater of the compressor and an open phase energization of a motor for driving the compressor. , At least one of phase switching of the electric power supplied to the motor driving the compressor. As a result, in addition to raising the temperature of the compressor and directly heating the refrigerant, the oil temperature in the compressor is raised and the evaporation of the refrigerant dissolved in the oil is promoted, so that the refrigerant recovery speed is increased. Can be.

According to a fourth aspect of the present invention, a predetermined degree of superheat is obtained when the refrigerant recovery mode input means for setting the refrigerant circuit to the refrigerant recovery mode and the refrigerant recovery mode input means are input. As described above, the present invention is characterized in that a timer operating means for operating the compressor for a predetermined time by narrowing the expansion valve of the refrigerant circuit is provided.

According to the present invention, when the refrigerant recovery mode input means is inputted, the refrigerant circuit is set to the refrigerant recovery mode. Then, in order to obtain a predetermined degree of superheat, the timer operation means throttles the expansion valve of the refrigerant circuit and operates the compressor for a predetermined time. By this operation, the refrigerant temperature, the compressor temperature, and the oil temperature in the compressor are increased, and the evaporation of the refrigerant is promoted, so that the refrigerant recovery speed can be increased.

Further, the invention of claim 5 provides the invention according to claims 1 to 3
In the refrigeration apparatus according to any one of the above, when the refrigerant recovery mode input means is input, the expansion valve of the refrigerant circuit is throttled so as to obtain a predetermined degree of superheat, and the compressor is operated for a predetermined time. It is characterized by having a timer operation means for performing the operation.

According to a fifth aspect of the present invention, when the refrigerant recovery mode input means is input, the refrigerant circuit is set to the refrigerant recovery mode, and the refrigerant heating means is operated to heat the refrigerant. At the same time, the timer operating means throttles the expansion valve of the refrigerant circuit and operates the compressor for a predetermined time. By this driving,
Since the refrigerant temperature, the compressor temperature, and the oil temperature in the compressor rise and the refrigerant is heated by the refrigerant heating means to promote the evaporation of the refrigerant, the refrigerant recovery speed can be increased.

Further, the invention of claim 6 provides the invention according to claims 1 to 5
The air conditioner according to any one of the above, wherein the refrigerant recovery mode input means is constituted by a switch provided in an outdoor unit of the refrigerant circuit.

According to the sixth aspect of the present invention, since the refrigerant recovery mode input means is constituted by a switch provided in the outdoor unit, there is no fear that a user may operate the refrigerant recovery mode input means erroneously during a normal cooling / heating operation. Disappears.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 shows a refrigerant piping system of an outdoor unit 2 and an indoor unit 3 in an air conditioner 1 as an embodiment of a refrigeration system of the present invention. This outdoor unit 2 has an output frequency of 4 to 10 in a range of 30 to 116 Hz.
It has a compressor 21 whose operating capacity is adjusted by an inverter 2a variably switched every Hz. The outdoor unit 2 switches between an oil separator 22 that separates oil in the gas refrigerant discharged from the compressor 21 during a cooling operation as indicated by a solid line in the drawing, and switches during heating operation as indicated by a broken line in the drawing. It has a four-way switching valve 23. Further, the outdoor unit 2 has an outdoor heat exchanger 24 as a heat source side heat exchanger serving as a condenser during cooling operation and an evaporator during heating operation, and an outdoor fan 2F attached to the outdoor heat exchanger 24.
Further, the outdoor unit 2 has an outdoor electric expansion valve 25 that is a heat source side expansion mechanism that performs a throttling operation of the refrigerant during the heating operation. Further, the outdoor unit 2 has a receiver 26 for storing a liquefied refrigerant and an accumulator 27. Each device such as the compressor 21 and the outdoor heat exchanger 24 is connected so that a refrigerant can flow through the refrigerant pipe 4.

The indoor unit 3 includes an indoor heat exchanger 31 as a use-side heat exchanger serving as an evaporator during a cooling operation and a condenser during a heating operation, and the indoor heat exchanger 3.
1 has an indoor fan 3F attached thereto. On the liquid pipe side of the refrigerant pipe 4 connected to the indoor heat exchanger 31, an indoor electric expansion valve 32 that adjusts the flow rate of the refrigerant during the heating operation and performs the throttling action of the refrigerant during the cooling operation is provided.

The outdoor unit 2 and the indoor unit 3 are connected by a communication pipe 41 which is a refrigerant pipe 4, and the compressor 21, the outdoor heat exchanger 24, the indoor heat exchanger 31 and the like are connected to the refrigerant pipes respectively. The main refrigerant circuit 11 is connected to a closed circuit by 4 so as to release heat obtained by heat exchange with outdoor air to indoor air.

In FIG. 1, reference numeral 42 denotes a heating overload control bypass which bypasses the outdoor heat exchanger 24. In this bypass passage 42, an auxiliary heat exchanger 4a installed in an air passage common to the outdoor heat exchanger 24, a capillary tube 4b, and an auxiliary open / close valve 4c that opens when the refrigerant is at a high pressure are sequentially connected in series. It is connected in parallel to the outdoor heat exchanger 24.

The auxiliary opening / closing valve 4c is turned on when the heating overload control bypass passage 42 is turned on at all times during the cooling operation and when the high pressure excessively rises during the heating operation. Thus, a part of the discharge gas is bypassed from the main refrigerant circuit 11 to the heating overload control bypass passage 42, and a part of the discharge gas is condensed by the auxiliary heat exchanger 4a.

The liquid injection bypass passage 43 injects a liquid refrigerant into the suction side of the compressor 21 during cooling / heating operation to adjust the degree of superheat of the suction gas. The liquid injection bypass passage 43 has an injection valve 4d which is opened when the discharge pipe temperature of the compressor 21 rises excessively.
And a capillary tube 4e. The oil return pipe 44 returns lubricating oil from the oil separator 22 to the compressor 21 via the capillary tube 4f. The equalizing hot gas bypass 45 connects the discharge-side refrigerant pipe 4 and the suction-side refrigerant pipe 4 of the compressor 21. In the pressure equalizing hot gas bypass 45, a pressure equalizing valve 4g and a capillary tube 4h, which are opened for a certain period of time when the compressor 21 is stopped due to a thermo-off state or the like and before restarting, are interposed.

The equalizing passage 46 is connected between the receiver 26 and the equalizing hot gas bypass passage 45. One end is connected to the upper end face of the receiver 26, and the other end is connected to the equalizing hot gas bypass 45. The passage 45 is connected to the upstream side of the pressure equalizing valve 4g. A check valve 4i that allows only the refrigerant flow from the receiver 26 to the pressure equalizing hot gas bypass 45 is provided in the pressure equalizing path 46. And 4g of pressure equalizing valve
Is opened, the gas refrigerant in the upper layer in the receiver 26 passes through the equalizing hot gas bypass 45 and the compressor 2
1 can be introduced into the suction side. Further, the suction pipe heat exchanger 2b cools the suction refrigerant by heat exchange between the suction refrigerant on the suction side of the compressor 21 and the liquid refrigerant in the liquid pipe of the refrigerant pipe 4, and the degree of superheat of the refrigerant in the communication pipe 41. Is to compensate for the rise.

In the air conditioner 1, a number of sensors are arranged. The room temperature sensor Th1 detects a room temperature T1 utilization side air temperature, which is a room suction air temperature. Further, an indoor liquid temperature sensor Th2 which is a liquid temperature detecting means.
Detects the liquid-side liquid refrigerant temperature T2 of the indoor heat exchanger 31. Further, an indoor gas temperature sensor Th serving as a gas temperature detecting means is provided.
3 is the gas refrigerant temperature T in the gas side refrigerant pipe 4 and
3 is detected.

The discharge pipe sensor Th4 is connected to the compressor 21
The outdoor liquid temperature sensor Th5 detects the discharge pipe temperature T4 of
Defrost and the like are detected from the liquid refrigerant temperature T5 of the outdoor heat exchanger 24. The suction pipe sensor Th6 is disposed in the suction refrigerant pipe 4 on the downstream side of the suction pipe heat exchanger 2b and detects the suction pipe temperature T6 of the compressor 21. Then, the outside air temperature sensor Th7 is disposed at the air suction port of the outdoor heat exchanger 24 and detects an outside air temperature T7 that is an outdoor suction air temperature.

The high-pressure sensor P1 is provided on the discharge side of the compressor 21 to detect the high-pressure side pressure of the main refrigerant circuit 11, and the low-pressure sensor P2 is provided on the suction side of the compressor 21. The low pressure side pressure of the refrigerant circuit 11 is detected. The protective high-pressure switch HPS of the compressor 21 is disposed on the discharge side of the compressor 21.

The outdoor unit 2 has a refrigerant recovery switch 101 as a refrigerant recovery mode input means.
The refrigerant recovery switch 101 is attached to a printed circuit board (not shown) of the outdoor unit 2. When the refrigerant recovery switch 101 is turned on, wiring is performed so that the indoor fan 31 of the indoor heat exchanger 31 and the outdoor fan 2F of the outdoor heat exchanger 24 operate. When the refrigerant recovery switch 101 is turned on, the compressor 21
Crankcase heater 10 wound around a crankcase
2 is energized.

Next, the cooling / heating operation of the air conditioner 1 will be described. In FIG. 1, during the cooling operation of the air conditioner, the four-way switching valve 23 is switched to the solid line side in the drawing, and the auxiliary opening / closing valve 4c of the auxiliary heat exchanger 4a is always open,
The refrigerant compressed by the compressor 21 is condensed by the outdoor heat exchanger 24 and the auxiliary heat exchanger 4a, and sent to the indoor unit 3 via the communication pipe 41.

In the indoor unit 3, the liquid refrigerant is decompressed by the indoor electric expansion valve 32 and the indoor heat exchanger 31
After returning to the outdoor unit 2 via the communication pipe 41 in a gaseous state, the refrigerant is circulated so as to be sucked into the compressor 21. That is, the liquid refrigerant cools the indoor air by performing heat exchange with the indoor air in the indoor heat exchanger 31 and evaporating.

During the heating operation, the four-way switching valve 23 is switched to the dashed line in the drawing, and the flow of the refrigerant is opposite to that during the cooling operation, and the refrigerant compressed by the compressor 21 is subjected to indoor heat exchange. Condensed in the vessel 31 and flows to the outdoor unit 2 in a liquid state,
The pressure is reduced by the outdoor electric expansion valve 25 and the outdoor heat exchanger 24 is
Circulates back to the compressor 21 after evaporation. That is, the gas refrigerant exchanges heat with the indoor air in the indoor heat exchanger 31 to condense, thereby heating the indoor air.

Next, the operation of the air conditioner 1 at the time of refrigerant recovery will be described with reference to the flowchart of FIG.

First, in step S1, the refrigerant recovery machine 201
Recovery port 202 and the liquid shutoff valve 103 of the air conditioner 1
Are connected by a charge hose 301.

Next, proceeding to step S2, the refrigerant recovery machine 2
01 is opened, and the refrigerant recovery machine 201 is operated. As a result, the refrigerant in the air conditioner 1 passes through the liquid shut-off valve 103 and the charge hose 301, and flows through the valve 20.
From 3 enter the refrigerant recovery machine 201. This refrigerant recovery machine 201
The refrigerant that has entered enters the heat exchanger 207 via the check valve 205 and the filter 206 and is heated. By this heating, the liquid refrigerant is completely gasified, then introduced into the compressor 210 via the accumulator 208 and compressed. Further, the refrigerant is supplied to the compressor 2
From 10, the oil is introduced into the heat exchanger 207 through the oil separator 211, cooled and liquefied, and then stored in the collection cylinder 215 through the closing valve 212.

Next, the process proceeds to step S3, where the refrigerant recovery switch 101 mounted on the printed circuit board of the outdoor unit 2 is manually turned on. Then, the electric expansion valve 32,
25 and each of the solenoid valves 4c, 4g, 4d are fully opened to enter the refrigerant recovery mode. Thereby, the circulation of the refrigerant in the refrigerant pipe is promoted, and the efficiency of refrigerant recovery is increased.

When the refrigerant recovery switch 101 is turned on, the indoor fan 3F and the outdoor fan 2F operate, and the liquid refrigerant remaining in the indoor heat exchanger 31 and the outdoor heat exchanger 24 becomes a heat source. Heated with air. Therefore, it is possible to prevent the cooling of the refrigerant due to the decompression by the compressor 210 of the refrigerant recovery device 201, promote the evaporation of the liquid refrigerant, promote the gasification of the refrigerant, and improve the refrigerant recovery speed.

When the refrigerant recovery switch 101 is turned on, the crankcase heater 102 wound around the crankcase of the compressor 21 is energized. Thereby, the temperature of the compressor 21 increases, and the oil temperature in the compressor 21 increases, so that the evaporation of the refrigerant dissolved in the oil is promoted, and the refrigerant recovery speed can be increased.

Next, the process proceeds to step S4, where the refrigerant recovery machine 2
When the low-pressure switch 202 detects the predetermined low pressure, the refrigerant recovery machine 201 determines that the recovery of the refrigerant has been completed, stops the compressor 210, and stops the recovery of the refrigerant.

Next, proceeding to step S5, the refrigerant recovery switch 101 of the outdoor unit 2 of the air conditioner 1 is manually turned off. Then, the indoor fan 3F and the outdoor fan 2F stop, and the power supply to the crankcase heater 102 stops.

Next, the process proceeds to step S6, where the refrigerant recovery machine 2
01 and the liquid shutoff valve 103 of the air conditioner 1
Is closed, and the charge hose 301 is removed.

As described above, according to this embodiment,
At the time of refrigerant recovery, the indoor fan 3F, the outdoor fan 2F and the crankcase heater 102 are turned on to promote the evaporation of the refrigerant, so that the refrigerant recovery speed can be increased.

Further, in this embodiment, since the refrigerant recovery switch 101 is mounted on a printed circuit board (not shown) of the outdoor unit 2, there is a concern that a user may operate the refrigerant recovery switch 101 incorrectly during a normal cooling and heating operation. Absent.

In the above-described embodiment, the refrigerant is heated by driving the indoor fan 31 and the outdoor fan 2F when the refrigerant recovery switch 101 is turned on in step S3 of the refrigerant recovery operation. In the case where is a water cooler, although not shown, a cold / hot water circulation pump may be operated to supply heat source water to the heat exchanger and heat the refrigerant with the heat source water.

Further, in the above embodiment, the temperature of the compressor 21 is raised by turning on the crankcase heater 102, but the compressor heating means is constituted by the compressor control unit 111,
The compressor control unit 111 heats the motor by conducting open-phase current to the compressor 21 to increase the temperature of the compressor 21,
The oil temperature in the compressor 21 may be increased to promote the evaporation of the refrigerant dissolved in the oil. Although not shown, in the case of a non-inverter unit, the compressor heating means may be configured by a switch for performing the open-phase operation.

Although the compressor heating means is not shown,
A switching circuit for switching the phase of the electric power supplied to the motor of the compressor (circuit for switching the connection with the normal state) may be used, and the temperature of the compressor may be raised by this phase switching.

When the refrigerant recovery switch 101 is turned on, a timer operation unit 112 that operates the air conditioner 1 for a predetermined time by squeezing the expansion valves 25 and 32 for a predetermined time.
May be provided, and the temperature of the refrigerant, the temperature of the compressor, and the temperature of the oil in the compressor may be increased by the superheat operation of the timer operation section 112 for a predetermined time.

As described above, when the refrigerant is recovered, when the refrigerant is heated by the heating degree operation in addition to the heating of the refrigerant by the refrigerant heating means, the liquid refrigerant evaporates and vaporizes due to the reduced pressure at the time of refrigerant recovery, and the residual refrigerant is evaporated. Cooling is completely prevented, the evaporation of the liquid refrigerant can be promoted, and the refrigerant recovery speed can be increased.

In the above embodiment, the air conditioner as an example of the refrigerating apparatus has been described. However, the refrigerating apparatus includes a refrigerator, an ice maker, a refrigerated container, and the like.

[0050]

As is apparent from the above description, in the refrigeration apparatus according to the first aspect of the present invention, when the refrigerant recovery mode input means is input, the refrigerant circuit is set to the refrigerant recovery mode, and the refrigerant heating means is operated to operate the refrigerant. Heat. Therefore, it is possible to prevent the liquid refrigerant from evaporating and evaporating due to the reduced pressure at the time of refrigerant recovery and to cool the residual refrigerant, thereby promoting the evaporation of the liquid refrigerant. Therefore, the refrigerant recovery speed can be improved.

According to a second aspect of the present invention, when the refrigerant recovery mode input means is input, at least one of the indoor fan of the indoor heat exchanger, the outdoor fan of the outdoor heat exchanger, and the circulation pump as the refrigerant heating means is provided. Run one. When the indoor and outdoor fans are operated, the liquid refrigerant remaining in the indoor and outdoor heat exchangers is heated by the heat source air and the temperature drop is suppressed, so that the refrigerant recovery speed can be increased. In addition, when the circulation pump is operated, the refrigerant in the heat exchanger is heated by the heat source water, and a decrease in the temperature of the refrigerant due to the refrigerant recovery is suppressed, so that the refrigerant recovery speed can be increased.

According to a third aspect of the present invention, when the refrigerant recovery mode input means is input, the compressor heating means energizes the crankcase heater of the compressor, opens the phase loss of the motor driving the compressor, At least one of phase switching of electric power supplied to a motor driving the compressor is performed. As a result, in addition to raising the temperature of the compressor and directly heating the refrigerant, the oil temperature in the compressor is raised and the evaporation of the refrigerant dissolved in the oil is promoted, so that the refrigerant recovery speed is increased. Can be.

Further, according to the invention of claim 4, when the refrigerant recovery mode input means is inputted, the refrigerant circuit is set to the refrigerant recovery mode. Then, the timer operation means throttles the expansion valve of the refrigerant circuit to obtain a predetermined degree of superheat, and then operates the compressor for a predetermined time. By this operation, the refrigerant temperature, the compressor temperature, and the oil temperature in the compressor are increased, and the evaporation of the refrigerant is promoted, so that the refrigerant recovery speed can be increased.

According to a fifth aspect of the present invention, when the refrigerant recovery mode input means is input, the refrigerant circuit is set to the refrigerant recovery mode, and the refrigerant heating means is operated to heat the refrigerant. At the same time, the timer operating means throttles the expansion valve of the refrigerant circuit and operates the compressor for a predetermined time. By this operation, the refrigerant temperature, the compressor temperature, and the oil temperature in the compressor rise, and together with the heating of the refrigerant by the refrigerant heating means, the evaporation of the refrigerant is promoted, so that the refrigerant recovery speed can be increased.

According to the sixth aspect of the present invention, since the refrigerant recovery mode input means is constituted by a switch provided in the outdoor unit, the user erroneously operates the refrigerant recovery mode input means during a normal cooling / heating operation. Eliminate worries.

[Brief description of the drawings]

FIG. 1 is a diagram showing a refrigerant circuit of an air conditioner as an embodiment of a refrigeration apparatus of the present invention.

FIG. 2 is a flowchart illustrating a refrigerant recovery operation of the air conditioner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air conditioner, 2 ... Outdoor unit, 2a ... Inverter, 2F ... Outdoor fan, 3 ... Indoor unit, 3F ... Indoor fan, 4 ... Refrigerant piping, 4a ... Auxiliary heat exchanger, 4b ... Capillary tube, 4c ... Auxiliary On-off valve, 4e, 4f, 4
h: capillary tube, 11: main refrigerant circuit, 21: compressor, 22: oil separator, 23: four-way switching valve, 24: outdoor heat exchanger, 26: receiver, 27: accumulator, 3
DESCRIPTION OF SYMBOLS 1 ... Indoor heat exchanger, 32 ... Indoor electric expansion valve, 41 ... Communication piping, 42 ... Heating overload control bypass path, 45 ... Equalizing hot gas bypass path, 101 ... Refrigerant recovery switch, 1
02 ... Crankcase heater, 103 ... Liquid shutoff valve, 20
DESCRIPTION OF SYMBOLS 1 ... Refrigerant recovery machine, 202 ... Recovery port, 203 ... Valve, 205 ... Check valve, 206 ... Filter, 207 ... Heat exchanger, 208 ... Accumulator, 210 ... Compressor, 21
1 ... oil separator, 212 ... close valve, 215 ... recovery cylinder.

Claims (6)

[Claims] A refrigerant heating means (2F, 3F) for heating a refrigerant in a refrigerant circuit, a refrigerant recovery mode input means (10) for setting the refrigerant circuit to a refrigerant recovery mode and operating the refrigerant heating means.
A refrigeration apparatus characterized by comprising (1). 2. The refrigeration apparatus according to claim 1, wherein the refrigerant heating means includes: an indoor fan (3F) of an indoor heat exchanger (31); an outdoor fan (2F) of an outdoor heat exchanger (24); A refrigeration unit, which is at least one of a circulation pump that supplies water to the exchanger. 3. The crankcase heater (102) of the compressor (21) according to claim 1, wherein said refrigerant recovery mode input means (101) is input.
At least one of energization to the compressor, open-phase energization of the motor driving the compressor (21), and phase switching of energization power to the motor driving the compressor (21) is performed to reduce the temperature of the compressor. A refrigeration system comprising a compressor heating means (111) for raising. 4. A refrigerant recovery mode input means (101) for setting a refrigerant circuit to a refrigerant recovery mode, and a predetermined degree of superheat is obtained when the refrigerant recovery mode input means (101) is input. A refrigerating apparatus comprising a timer operating means (112) for restricting an expansion valve (32, 25) of a refrigerant circuit to operate a compressor for a predetermined time. 5. The refrigeration apparatus according to claim 1, wherein when the refrigerant recovery mode input means (101) is input, expansion of the refrigerant circuit is performed so that a predetermined degree of superheat is obtained. A refrigeration system comprising timer operation means (112) for operating the compressor for a predetermined time by restricting the valves (32, 25). 6. The refrigeration apparatus according to claim 1, wherein the refrigerant recovery mode input means is constituted by a switch (101) provided in an outdoor unit (2) of the refrigerant circuit. Characterized refrigeration equipment.