JP2000249385A - Freezer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the excessive inflow of a refrigerant to a compressor at start of heating operation, in a freezer which executes the pump down operation to collect a refrigerant in an outdoor unit at stoppage of operation of the compressor. SOLUTION: The line between the solenoid valve 31 on liquid side and the solenoid valve 32 on gas side of an outdoor unit 1 is charged with a refrigerant at stoppage of operation of a compressor 4. The circulation of the refrigerant from an outdoor heat exchanger 6 to a compressor 4 is controlled by controlling the solenoid valve 32 on gas side to open and close during the specified time from the start of heating operation. Hereby, since it is so arranged as to recover the refrigerant in the outdoor unit before stoppage of operation of the compressor 4, this freezer can prevent the leakage of a refrigerant inside a room, while since it is so arranged as to suppress the flow of the refrigerant to the compressor at start of heating operation, the excessive inflow of the refrigerant to the compressor is prevented, and the reliability on the compressor rises.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a refrigeration apparatus,
In particular, the present invention relates to a refrigeration apparatus that executes a pump-down operation for storing a refrigerant outside the room when the operation is stopped.

[0002]

2. Description of the Related Art Conventionally, in a refrigerating apparatus in which an outdoor unit and an indoor unit are connected via a communication pipe, in order to prevent leakage of refrigerant into a room, the outdoor unit is detected when refrigerant leakage is detected or when operation is stopped. There is known one in which a refrigerant is stored on the side. For example, JP-A-5-11
No. 8720 discloses a refrigeration apparatus that performs a pump-down operation for storing refrigerant in the outdoor unit when a refrigerant leaks.

Referring to FIG. 4, a conventional refrigeration system for storing a refrigerant in an outdoor unit will be described. This refrigeration apparatus has a closing valve (106) for closing the outdoor unit (111) before connecting the outdoor unit (111) and the indoor unit (112),
Separately from (107), solenoid valves (108), (109)
It has.

[0004] During the cooling operation, the refrigerant discharged from the compressor (101) passes through the four-way switching valve (102) and passes through the outdoor heat exchanger.
After condensing at (103), reducing the pressure with the electric expansion valve (104), evaporating with the indoor heat exchanger (105), the compressor (1
The circulation operation returning to 01) is performed. When the operation of the apparatus is stopped, first, the solenoid valve (109) on the liquid side (high pressure side) is closed while the operation of the compressor (101) is continued. As a result, the pressure on the low pressure side of the refrigerant circuit gradually decreases, and the low pressure switch (114) is operated to stop the operation of the compressor (101). At the same time as the operation of the compressor (101) is stopped, the solenoid valve (108) on the gas side (low pressure side) is closed to open the outdoor unit (111).
Is closed, and the refrigerant is stored in the outdoor unit (111). By such a pump-down operation, the refrigerant hardly exists in the indoor unit (112), and it is possible to prevent a large amount of refrigerant from leaking into the room.

On the other hand, during the heating operation, the refrigerant discharged from the compressor (101) passes through the four-way switching valve (102), is condensed in the indoor heat exchanger (105), and is condensed in the electric expansion valve (104). After the pressure is reduced and evaporated in the outdoor heat exchanger (103), a circulation operation is performed to return to the compressor (101) via the four-way switching valve (102). Then, when the operation of the apparatus is stopped, first, the state of the four-way switching valve (102) is switched, and the circulation path of the refrigerant is made the same as in the cooling operation. Thereafter, a pump-down operation similar to the pump-down operation during the cooling operation is performed.

[0006]

However, the outdoor unit
When the operation of the compressor (101) is restarted in the heating operation mode after the refrigerant is stored in the (111) side, the pressure on the suction side of the compressor (101) temporarily drops suddenly. Container (1
The liquid refrigerant accumulated in 03) may flow excessively into the compressor (101). When a large amount of the liquid refrigerant flows into the compressor (101) in this way, the refrigerating machine oil in the compressor (101) is diluted, and the viscosity may be reduced to make it impossible to secure the viscosity required for lubrication. Further, the liquid refrigerant may flow into the compression chamber of the compressor (101), causing liquid compression. For this reason, in the device that stores the refrigerant in the outdoor unit, the reliability of the compressor (101) during the heating operation has been reduced.

[0007] The present invention has been made in view of such a point, and an object thereof is to improve the reliability of a compressor by preventing excessive inflow of refrigerant into the compressor at the start of a heating operation. To make it happen.

[0008]

In order to achieve the above object, the present invention limits the flow of the refrigerant to the compressor (4) at the start of the heating operation.

More specifically, the refrigeration apparatus according to the present invention comprises an outdoor unit (1) and an indoor unit (2) connected to each other,
A refrigerator that performs a pump-down operation for storing refrigerant in the outdoor unit (1) before the operation of the compressor (4) is stopped,
At the start of operation of the compressor (4), the compressor (4) is provided with an excessive inflow suppression means for suppressing the flow of the refrigerant to the compressor (4) so as to prevent the accumulated refrigerant from excessively flowing into the compressor (4). It is what you have decided.

According to the above, before the operation of the compressor (4) is stopped, the refrigerant is stored in the outdoor unit (1), and the amount of residual refrigerant in the indoor unit (2) is reduced. Therefore, even if the refrigerant leaks in the indoor unit (2), the amount of the leak is reduced. At the start of heating operation, the compressor (4)
Since the flow of refrigerant to the outdoor unit (1) is suppressed, a large amount of refrigerant accumulated in the outdoor unit (1) is prevented from flowing into the compressor (4), and the reliability of the compressor (4) is improved.

Further, another refrigeration apparatus according to the present invention comprises a compressor (4), a flow path switching mechanism (5) for switching a circulation direction of the refrigerant,
An outdoor unit (1) having an outdoor heat exchanger (6) and a pressure reducing mechanism (7), and an indoor unit (2) having an indoor heat exchanger (8)
And a liquid-side and gas-side communication pipe (3a, 3b) for connecting the outdoor unit (1) and the indoor unit (2), wherein the liquid line of the outdoor unit (1) is provided. And closing means (31, 32, 7) for closing the gas line, and the compressor
When the operation of (4) is stopped, the liquid line (25) of the outdoor unit (1) is controlled after controlling the flow path switching mechanism (5) so that the pressure on the indoor unit (2) side is a low pressure. Close and perform a pump-down operation to recover the refrigerant of the indoor unit (2) to the outdoor unit (1), and then close the gas line (21) of the outdoor unit (1) to close the outdoor unit (1). ) And a refrigerant recovery control means (35) for charging the refrigerant from the outdoor heat exchanger (6) so as to prevent excessive flow of the charged refrigerant into the compressor (4) at the start of the heating operation. (4) An excessive inflow suppressing means for suppressing the flow of the refrigerant to (4).

According to the above, when the operation of the compressor (4) is stopped, the indoor unit is operated by the flow path switching mechanism (5).
The refrigerant flow path is set so that the (2) side has a low pressure, and the liquid line of the outdoor unit (1) is closed by the liquid side closing means. As a result, the refrigerant of the indoor unit (2) is sucked into the outdoor unit (1) by the compressor (4), and is collected by the outdoor unit (1). Thereafter, the gas line of the outdoor unit (1) is closed by the gas side closing means. Thereby, the refrigerant is sealed in the outdoor unit (1). When the heating operation is started, the flow of the refrigerant from the outdoor heat exchanger (6) to the compressor (4) is suppressed by the excess inflow suppression means, and the refrigerant accumulated in the outdoor heat exchanger (6) is compressed. Large quantities are prevented from flowing into the machine (4). Therefore, the reliability of the compressor (4) is improved.

The flow path switching mechanism includes a first port (5a) connected to the discharge side of the compressor (4), a second port (5b) connected to the outdoor heat exchanger (6), A four-way switching valve (5) having a third port (5c) connected to the suction side of the compressor (4) and a fourth port (5d) connected to the indoor heat exchanger (8). The excess inflow suppression means is constituted by the four-way switching valve (5).
A valve mechanism (32) provided between the second port (5b) and the outdoor heat exchanger (6), and the valve mechanism (32) closes a gas line of the outdoor unit (1). The gas side closing means may also be used.

According to the above, the flow path switching mechanism and the excessive inflow suppressing means are simply configured. Also, since the valve mechanism also serves as the closing means, the refrigerant is sealed from the valve mechanism on the outdoor heat exchanger (6) side. Therefore, the four-way switching valve (5)
Even when using a type that causes some refrigerant leakage (the refrigerant flows between the closed ports),
Further, even when the compressor (4) is of a type that allows the refrigerant to pass therethrough during operation stoppage, the refrigerant does not leak from the outdoor unit (1) to the indoor unit (2). Is prevented.

The excess inflow suppression means includes a solenoid valve (32) provided between the compressor (4) and the outdoor heat exchanger (6), and the outdoor heat exchanger (6). Control means (35) for controlling the opening and closing of the solenoid valve (32) so as to suppress the flow of the refrigerant to 4) may be provided.

According to the above, at the start of the heating operation, the solenoid valve (3) provided between the compressor (4) and the outdoor heat exchanger (6) is used.
2) is opened and closed, and the refrigerant intermittently flows from the outdoor heat exchanger (6) toward the compressor (4). Therefore, the compressor
Excessive flow of refrigerant into (4) is prevented.

Further, the above-mentioned excessive inflow suppressing means is provided with a compressor
(4) a control valve having an adjustable opening provided between the outdoor heat exchanger (6) and a refrigerant valve from the outdoor heat exchanger (6) to the compressor (4); Control means for controlling the opening of the control valve as described above.

According to the above, at the start of the heating operation, the opening degree of the control valve provided between the compressor (4) and the outdoor heat exchanger (6) is adjusted, so that the compression from the outdoor heat exchanger (6) is started. The flow of the refrigerant toward the machine (4) is suppressed. Therefore, the refrigerant is prevented from excessively flowing into the compressor (4).

When the refrigerant is a refrigerant containing a flammable refrigerant or a slightly flammable refrigerant (including a flammable refrigerant or a slightly flammable refrigerant itself), it is necessary to strictly control refrigerant leakage in a room. Therefore, it is particularly desired to store the refrigerant in the outdoor unit. Therefore, at the start of the heating operation, the necessity of preventing the refrigerant from excessively flowing into the compressor (4) is further increased.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> As shown in FIG.
The refrigeration apparatus (51) according to the embodiment, an outdoor unit (1) installed outdoors, an indoor unit (2) installed indoors,
A communication pipe (3) for connecting the outdoor unit (1) and the indoor unit (2) is provided. The refrigerant circuit of the refrigeration apparatus (51) is filled with a flammable refrigerant.

First, the configuration of the outdoor unit (1) will be described. The outdoor unit (1) includes a compressor (4), a four-way switching valve (5) as a flow path switching mechanism, an outdoor heat exchanger (6), an outdoor blower
(9) The electric expansion valve (7) is housed.

The discharge pipe (27) of the compressor (4) is connected to the first port (5a) of the four-way switching valve (5), and the suction pipe (28) of the compressor (4) is It is connected to the third port (5c) of the road switching valve (5). The discharge side pipe (27) is provided with a high pressure switch (29), and the suction side pipe (28) is provided with a low pressure switch (30). The second port (5b) of the four-way switching valve (5)
It is connected to one end of the outdoor heat exchanger (6) via a pipe (21). This pipe (21) has a gas side solenoid valve as a valve mechanism.
(32) is provided. That is, the gas side solenoid valve (32)
It is provided between the second port (5b) of the four-way switching valve (5) and the outdoor heat exchanger (6).

The other end of the outdoor heat exchanger (6) is connected to one end of an electric expansion valve (7) via a pipe (22). One end of a pipe (25) is connected to the other end of the electric expansion valve (7). The pipe (25) is a pipe forming a part of the liquid line of the refrigerant circuit. The pipe (25) is provided with a liquid-side solenoid valve (31) as closing means for closing the liquid line of the outdoor unit (1). The other end of the pipe (25) is connected to one end of a liquid-side stop valve (14), and the other end of the liquid-side stop valve (14) is connected to one end of a liquid-side communication pipe (3a).

One end of a pipe (26) is connected to the fourth port (5d) of the four-way switching valve (5). This pipe (26) is a pipe forming a part of the gas line of the outdoor unit (1). The other end of the pipe (26) is connected to one end of a gas-side shut-off valve (15), and the other end of the gas-side shut-off valve (15) is connected to a gas-side communication pipe (3b).

The indoor unit (2) includes an indoor heat exchanger (8) and an indoor blower (not shown). Indoor heat exchanger (8)
Is connected to the other end of the liquid-side communication pipe (3a) via the pipe (11). The other end of the indoor heat exchanger (8) is connected to the pipe (12)
Is connected to the other end of the gas side communication pipe (3b).

The liquid-side stop valve (14) and the gas-side stop valve (1
5) connects the outdoor unit (1) and the indoor unit (2)
This is a closing valve for closing the refrigerant circuit on the outdoor unit (1) side before connecting via (3), that is, before assembling the refrigeration apparatus.

The refrigeration system (51) is provided with a controller (35) as control means for executing each control described later.

-Normal Operation- Next, the operation of the refrigeration system (51) will be described based on the circulation operation of the refrigerant. During the cooling operation, the four-way switching valve (5) is set on the solid line side in the drawing. That is, the four-way switching valve (5) connects the first port (5a) and the second port (5b), and
The state is set to connect the port (5c) and the fourth port (5d). In such a state, the refrigerant discharged from the compressor (4) passes through the four-way switching valve (5), and the outdoor heat exchanger (6)
, And the pressure is reduced by the electric expansion valve (7). And
This refrigerant is supplied to the outdoor unit through the liquid side connection pipe (3a).
It moves from (1) to the indoor unit (2) and evaporates in the indoor heat exchanger (8) to cool the indoor air. The refrigerant flowing out of the indoor heat exchanger (8) passes through the gas side communication pipe (3b) to the indoor unit.
It moves from (2) to the outdoor unit (1) and is sucked into the compressor (4) via the four-way switching valve (5). With the above-described refrigerant circulation operation, indoor cooling is performed.

On the other hand, during the heating operation, the four-way switching valve (5) is set on the broken line side in the drawing. That is, four-way switching valve (5)
Is set so that the first port (5a) and the fourth port (5d) are connected and the second port (5b) and the third port (5c) are connected. In such a state, the refrigerant discharged from the compressor (4) passes through the four-way switching valve (5) and passes from the outdoor unit (1) to the indoor unit through the gas-side communication pipe (3b).
Go to (2). The refrigerant flowing into the indoor unit (2) is condensed in the indoor heat exchanger (8) and heats the indoor air. The refrigerant flowing out of the indoor heat exchanger (8) moves from the indoor unit (2) to the outdoor unit (1) through the liquid side communication pipe (3a), and is depressurized by the electric expansion valve (7). The decompressed refrigerant evaporates in the outdoor heat exchanger (6), passes through the four-way switching valve (5), and is sucked into the compressor (4). The above-described refrigerant circulation operation heats the room.

-Pump-down operation-Next, a pump-down operation for storing the refrigerant in the outdoor unit (1) will be described. This pump-down operation is performed when the operation of the compressor (4) is stopped. In the pump-down operation, first, the four-way switching valve (5) is set to a state shown by a solid line in the drawing so that the refrigerant performs a circulation operation during the cooling operation. That is, when the cooling operation is stopped, the state of the four-way switching valve (5) is maintained as it is, and when the heating operation is stopped, the state of the four-way switching valve (5) is switched.

Then, in the above state, the liquid-side solenoid valve (31) is closed while the operation of the compressor (4) is continued. This restricts the outflow of the refrigerant from the outdoor unit (1), while controlling the indoor unit through the gas-side communication pipe (3b).
The refrigerant of (2) is collected in the outdoor unit (1).
After such a collection operation is continued for a predetermined time, the gas-side solenoid valve (32) is closed. As a result, between the gas side solenoid valve (32) and the outdoor heat exchanger (6), the inside of the outdoor heat exchanger (6), the pipe (22)
The refrigerant is sealed in the inside and between the electric expansion valve (7) and the liquid side solenoid valve (31).

—Excessive Inflow Suppression Control— Next, the excessive inflow suppression control performed at the start of the heating operation will be described. The excessive inflow suppression control is a control for preventing the accumulated refrigerant from excessively flowing into the compressor (4), and is specifically executed as follows.

As shown in the time chart of FIG. 2, at the start of the heating operation, the compressor (4) and the outdoor blower (9) are started, and the liquid-side solenoid valve (31) is opened. The electric expansion valve (7) is controlled such that the opening gradually increases to a predetermined opening. The gas side solenoid valve (32) is controlled to open and close repeatedly at predetermined intervals.

As described above, by alternately repeating the open state and the closed state of the gas side solenoid valve (32), the gas side solenoid valve (3
When 2) is in the closed state, the refrigerant flow to the compressor (4) is blocked, so that the enclosed refrigerant slowly flows into the compressor (4), and from the outdoor heat exchanger (6) to the compressor. The rapid inflow of the refrigerant into (4) is prevented.

Thereafter, after the opening / closing control of the gas side solenoid valve (32) is continued for a predetermined time, the gas side solenoid valve (32) is maintained in an open state,
Shift to normal heating operation.

-Effects of this embodiment- As described above, according to this embodiment, the gas-side solenoid valve (32) is controlled to open and close at the start of the heating operation. Refrigerant circulation to the machine (4) is suppressed. Therefore, excessive inflow of the liquid refrigerant to the compressor (4) is prevented, and the reliability of the compressor (4) is improved.

The gas side solenoid valve (32) is an outdoor unit.
Since (1) also serves as a closing means for charging the refrigerant, a dedicated closing valve for closing the gas line of the outdoor unit (1) can be omitted. In addition, the gas side solenoid valve (3
Since 2) is provided between the four-way switching valve (5) and the outdoor heat exchanger (6), use a four-way switching valve (5) that leaks refrigerant between the closing ports. Even, outdoor unit (1)
It is possible to prevent the refrigerant accumulated in the indoor unit (2) from flowing back to the indoor unit (2). Therefore, various types of four-way switching valves can be used. Also, similarly, the compressor
As (4), even if a type in which the refrigerant passes inside during operation stop is used, backflow of the sealed refrigerant to the indoor unit (2) is prevented. Therefore, various types of compressors can be used.

The refrigerant used in the refrigeration system (51) may be an HC-based refrigerant such as propane, a slightly flammable refrigerant such as HFC32, or a non-flammable refrigerant.

<Second Embodiment> In the second embodiment, the gas side solenoid valve (32) in the first embodiment is a solenoid valve whose opening can be adjusted in two stages, that is, a two-stage solenoid valve ("control valve"). "). The configuration of the device is the same as that of the first embodiment, and a description thereof will be omitted.

In this embodiment, the excessive inflow suppression control is performed as follows. That is, as shown in the time chart of FIG. 3, at the start of the heating operation, the compressor (4) and the outdoor blower (9) are started, and the liquid-side solenoid valve (31) is started.
To open. The electric expansion valve (7) is controlled such that the opening gradually increases to a predetermined opening. The two-stage solenoid valve is controlled to an intermediate opening.

As described above, by adjusting the opening of the two-stage solenoid valve to the intermediate opening, the flow of the refrigerant from the outdoor heat exchanger (6) to the compressor (4) is suppressed. Excessive flow of the refrigerant into (4) is prevented.

Thereafter, when a predetermined time has elapsed, the two-stage solenoid valve is controlled to be fully opened, and the operation shifts to a normal heating operation.

Therefore, also in the present embodiment, since the excess refrigerant is prevented from flowing into the compressor (4) at the start of the heating operation, the reliability of the compressor (4) is improved.

-Modifications- The solenoid valve is not limited to a two-stage solenoid valve whose opening can be adjusted in two stages, but may be a multi-stage solenoid valve whose opening can be adjusted in three or more stages.

Further, an electric valve whose opening can be adjusted may be used in place of the solenoid valve. In this case, the same effect as in the above embodiment can be obtained by controlling the opening of the motor-operated valve.

It is also possible to use the electric expansion valve (7) as closing means.

The refrigeration apparatus according to the present invention is not limited to a refrigeration apparatus in a narrow sense, but is a refrigeration apparatus in a broad sense including an air conditioner, a refrigerator and the like.

[0049]

As described above, according to the present invention, the compressor
Since the refrigerant is collected in the outdoor unit (1) before the operation is stopped in (4), it is possible to prevent the refrigerant from leaking indoors, while the refrigerant flows to the compressor (4) at the start of the heating operation. Therefore, excessive inflow of the refrigerant into the compressor (4) is prevented, and the reliability of the compressor (4) is improved.

The flow path switching mechanism is constituted by a four-way switching valve (5), a valve mechanism is provided between the four-way switching valve (5) and the outdoor heat exchanger (6), and the outdoor unit ( 1) By also using the closing means for closing the side, the refrigerant is sealed from the valve mechanism on the outdoor heat exchanger (6) side, so regardless of the type of the four-way switching valve or the compressor, the outdoor unit
Leakage of the refrigerant from (1) to the indoor unit (2) can be prevented.

An electromagnetic valve is provided between the compressor (4) and the outdoor heat exchanger (6), and the opening and closing of the electromagnetic valve is controlled at the start of the heating operation, so that the excess refrigerant flows into the compressor (4). Can be effectively prevented.

Further, a control valve whose opening can be adjusted is provided between the compressor (4) and the outdoor heat exchanger (6), and the opening of the control valve is adjusted at the time of starting the heating operation. Excessive inflow of the refrigerant into (4) can be effectively prevented.

When a refrigerant containing a flammable refrigerant or a slightly flammable refrigerant is used, it is highly necessary to store the refrigerant in the outdoor unit (1), so that the above-described effect of preventing the refrigerant from excessively flowing into the compressor (4). Is more remarkably exhibited.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a refrigeration apparatus according to a first embodiment.

FIG. 2 is a time chart of the excessive inflow suppression control according to the first embodiment.

FIG. 3 is a time chart of an excessive inflow suppression control according to a second embodiment.

FIG. 4 is an overall configuration diagram of a conventional refrigeration apparatus.

[Explanation of symbols]

 (1) Outdoor unit (2) Indoor unit (3) Connecting pipe (4) Compressor (5) Four-way switching valve (flow path switching mechanism) (6) Outdoor heat exchanger (7) Electric expansion valve (pressure reducing mechanism) (8) Indoor heat exchanger (31) Liquid side solenoid valve (closing means) (32) Gas side solenoid valve (valve mechanism) (35) Controller (control means)

Claims (6)

[Claims] An refrigeration system comprising an outdoor unit (1) and an indoor unit (2) connected to each other, and performing a pump-down operation for storing refrigerant in the outdoor unit (1) before the operation of the compressor (4) is stopped. An apparatus for controlling the flow of refrigerant to the compressor (4) so as to prevent the accumulated refrigerant from flowing into the compressor (4) at the time of starting the operation of the compressor (4). A refrigeration system having an inflow suppression means. 2. A compressor (4), a flow path switching mechanism (5) for switching a circulation direction of a refrigerant, an outdoor heat exchanger (6), and a pressure reducing mechanism.
(7), an outdoor unit (2) having an indoor heat exchanger (8), and a liquid side and a gas side connecting the outdoor unit (1) and the indoor unit (2). A refrigerating apparatus including a communication pipe (3a, 3b), a closing means (31, 32, 7) for closing a liquid line and a gas line of the outdoor unit (1); When the operation is stopped, the above indoor unit
(2) The above-mentioned flow path switching mechanism so that the pressure on the side becomes a low pressure.
After controlling (5), the liquid line (2
5) is closed, a pump-down operation for recovering the refrigerant of the indoor unit (2) to the outdoor unit (1) is performed, and then the gas line (21) of the outdoor unit (1) is closed to open the outdoor unit (1). Refrigerant recovery control means (35) for charging the refrigerant into the unit (1), and from the outdoor heat exchanger (6) to prevent excessive flow of the charged refrigerant into the compressor (4) at the start of the heating operation. A refrigerating apparatus comprising: an excessive inflow suppressing means for suppressing a flow of a refrigerant to the compressor (4). 3. The refrigerating apparatus according to claim 2, wherein the flow path switching mechanism is connected to a first side of the compressor connected to a discharge side of the compressor.
A port (5a), a second port (5b) connected to the outdoor heat exchanger (6), and a third port (5c) connected to the suction side of the compressor (4). A four-way switching valve (5) having a fourth port (5d) connected to the side of the vessel (8), and the excess inflow suppressing means comprises a second port of the four-way switching valve (5).
Valve mechanism provided between (5b) and the outdoor heat exchanger (6)
(32) A refrigerating apparatus, wherein the valve mechanism (32) also serves as a gas-side closing means for closing a gas line of the outdoor unit (1). 4. The refrigeration apparatus according to claim 1, wherein the excess inflow suppression means is provided between the compressor (4) and the outdoor heat exchanger (6). An electromagnetic valve (32), and the electromagnetic valve so as to suppress the flow of refrigerant from the outdoor heat exchanger (6) to the compressor (4).
A refrigerating apparatus comprising: a control unit (35) for controlling the opening and closing of (32). 5. The refrigerating apparatus according to claim 1, wherein the excessive inflow suppressing means is provided between the compressor (4) and the outdoor heat exchanger (6). A control valve having an adjustable opening degree, and control means for controlling an opening degree of the control valve so as to suppress a flow of refrigerant from the outdoor heat exchanger (6) to the compressor (4). Refrigeration equipment. 6. The refrigeration apparatus according to claim 1, wherein the refrigerant includes a flammable refrigerant or a slightly flammable refrigerant.