JPH07332784A - Air conditioner - Google Patents

Abstract

PURPOSE:To enable replacement of a compressor with a minimum amount of release of a refrigerant by a construction wherein the compressor, a condenser, a restricting device and an evaporator are connected in a loop by a refrigerant piping and also on-off valves being openable and closable are provided in the piping on the suction and discharge sides in the vicinity of the compressor respectively. CONSTITUTION:A compressor 1, a condenser 2, a restricting device 3 and an evaporator 4 are connected in a loop by a refrigerant piping, while on-off valves 5a and 5b being openable and closable are provided in the piping on the discharge and suction sides in the vicinity of the compressor 1 respectively. When the on-off valves 5a and 5b are opened prior to an ordinary operation, a refrigerant discharged from the compressor 1 flows, forming a refrigerating cycle of circulating to the compressor 1 via the condenser 2, the restricting device 3 and the evaporator 4. At the time when the compressor 1 fails and needs to be replaced, it can be replaced by closing the on-off valves 5a and 5b, removing the connection between the compressor 1 and the on-off valves 5a and 5b and cutting off the compressor 1 from the refrigerating cycle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner.

[0002]

2. Description of the Related Art In a conventional air conditioner, except for the piping connection portion of the indoor and outdoor units of a separation type unit, the connection of its constituent equipment and refrigerant piping are all welded.
The refrigerant is sealed. Therefore, in the unlikely event that the compressor breaks down and needs to be replaced, the welded portion at the connection with the compressor is removed and the compressor is replaced.

[0003]

However, the air conditioner having the above-mentioned conventional structure has a problem that it is necessary to discharge all the refrigerant in the refrigeration cycle to the atmosphere when the compressor is replaced.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an air conditioner capable of exchanging a compressor with a minimum refrigerant discharge amount even when exchanging the compressor. .

Further, in the air conditioner having the above-mentioned conventional structure,
When replacing the compressor, the inside of the refrigeration cycle and the compressor are open to the atmosphere and air enters, so that water in the air especially dissolves in the refrigeration oil and causes hydrolysis of the refrigerant during subsequent operation. However, there is a problem that the operation of the refrigeration cycle is interrupted by causing water chalk.

Another object of the present invention is to solve the above-mentioned problems of the prior art, and it is possible to replace the compressor with a minimum amount of refrigerant discharge even when replacing the compressor, and during replacement work. An object of the present invention is to provide an air conditioner that minimizes the internal portion of a refrigeration cycle exposed to the atmosphere.

Further, in the air conditioner of the above-mentioned conventional structure, particularly in the case of a separation type unit in which the compressor is placed outdoors, the refrigerant in the refrigeration cycle moves due to the temperature difference between the indoor and the outdoor while the compressor is stopped. Then, a so-called stagnation phenomenon occurs, in which the compressor melts into the compressor, causing oil forming and liquid compression at the next compressor start, and in the worst case, destroying the compressor.

Still another object of the present invention is to solve the above-mentioned conventional problems, and an object thereof is to provide an air conditioner which prevents the stagnation phenomenon while the compressor is stopped.

[0009]

To achieve the above object, an air conditioner of the present invention comprises a compressor, a condenser, a throttle device, and an evaporator, which are annularly connected by a refrigerant pipe. An on-off valve that can be opened and closed is provided in each of the suction side and discharge side pipes near the compressor.

Further, a hermetic compressor having a compressor opening / closing valve at each of the discharge side pipe connection portion and the suction side pipe connection portion, a condenser, a throttle device, and an evaporator are annularly formed by a refrigerant pipe. With connection, the suction side near the hermetic compressor,
The structure is provided with a connecting pipe that connects the open / close valve that is openable / closable provided in the discharge side pipe and the compressor open / close valve.

Further, a hermetic compressor having a compressor opening / closing valve that can be opened and closed at the discharge side pipe connection portion and the suction side pipe connection portion, a condenser, a throttle device, and an evaporator are annularly connected by a refrigerant pipe. Connected to, the suction side near the hermetic compressor, a solenoid valve that is closed when the power supply is not energized provided in the piping of the discharge side, and open the solenoid valve while the hermetic compressor is operating, An electromagnetic valve control device that closes the electromagnetic valve when the hermetic compressor is stopped, and a connection pipe that connects the compressor on-off valve and the electromagnetic valve are provided.

[0012]

In the air conditioner of the present invention configured as described above, the compressor, the condenser, the expansion device, and the evaporator are annularly connected by the refrigerant pipes, and the suction side near the compressor,
Since the discharge side pipe is provided with an open / close valve that can be opened and closed, it is possible to replace the compressor with a minimum refrigerant discharge amount when replacing the compressor.

Further, a hermetic compressor having a compressor opening / closing valve which can be opened and closed at each of the discharge side pipe connecting portion and the suction side pipe connecting portion, the condenser, the expansion device, and the evaporator are annularly formed by a refrigerant pipe. With connection, the suction side near the hermetic compressor,
Since each of the open / close valves provided in the discharge side pipe is provided with a connecting pipe connecting the compressor open / close valve and the open / close valve, a minimum refrigerant discharge amount is required when replacing the compressor. The compressor can be replaced and the portion of the refrigeration cycle that is exposed to the atmosphere during the replacement operation can be minimized.

Further, a hermetic compressor having a compressor opening / closing valve that can be opened and closed at each of the discharge side pipe connection portion and the suction side pipe connection portion, the condenser, the expansion device, and the evaporator are connected by refrigerant pipes. A solenoid valve that is connected in an annular shape and that is closed in the pipes on the suction side and the discharge side near the hermetic compressor and that closes when the power is off, and opens the solenoid valve when the hermetic compressor is operating. When the hermetic compressor is stopped, a solenoid valve control device that closes the solenoid valve and a connection pipe that connects the compressor opening / closing valve and the solenoid valve are provided, so that it is possible to minimize the time when the compressor is replaced. It is possible to replace the compressor with the refrigerant discharge amount, and to minimize the internal portion of the refrigeration cycle that is exposed to the atmosphere during the replacement work, and further to prevent the stagnation phenomenon when the compressor is stopped.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the air conditioner according to the present invention will be described below with reference to FIG.

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to a first embodiment of the present invention. In FIG. 1, 1 is a compressor, 2 is a condenser, 3 is a throttle device, 4 is an evaporator, 5a,
Reference numeral 5b is an on-off valve provided in each of the suction side and discharge side pipes near the compressor 1.

The operation of the air conditioner configured as above will be described below. First, if the on-off valves 5a and 5b are opened prior to the normal operation, the refrigerant discharged from the compressor 1 is circulated to the compressor 1 via the condenser 2, the expansion device 3 and the evaporator 4, and is then frozen. Since the flow forms a cycle, air conditioning can be performed.

Next, when the compressor 1 fails and needs to be replaced, the on-off valves 5a and 5b are closed, the connection between the compressor 1 and the on-off valves 5a and 5b is disconnected, and the compressor 1 is frozen. This can be done by disconnecting from the cycle.

At this time, the refrigerant inside the compressor 1 is released into the atmosphere, but the amount thereof is small when viewed from the entire refrigeration cycle, and most of it is sealed by the on-off valves 5a and 5b. It is left on the side where it is.

After installing the new compressor 1,
For example, if a service branch pipe is provided in the pipe portion between the on-off valves 5a and 5b and the compressor 1, a refrigeration cycle is completed by pinching after vacuuming and gas charging, the on-off valve is then completed. The operation can be started by opening 5a and 5b.

As described above, the air conditioner according to this embodiment has the compressor 1, the condenser 2, the expansion device 3, and the evaporator 4.
And refrigerant are connected in an annular shape by a refrigerant pipe, and an open / close valve 5 that can be opened and closed in the suction side and discharge side pipes near the compressor 1 respectively.
Since a and 5b are provided, the compressor can be replaced with a minimum refrigerant discharge amount even when the compressor is replaced.

Next, a second embodiment of the air conditioner according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 2 is a refrigeration cycle diagram of the air conditioner according to the second embodiment of the present invention. In FIG. 2, 11 is a hermetic compressor, and 15a and 15b are hermetic compressors 11,
Compressor opening / closing valves 25a and 25b provided at the discharge side piping connection portion and the suction side piping connection portion are openable and closable, respectively, and connecting pipes connecting the compressor opening / closing valves 15a and 15b and the opening / closing valves 5a and 5b.

The operation of the air conditioner configured as above will be described below. When the compressor 1 fails and needs to be replaced, the compressor on-off valves 15a and 15b and the on-off valves 5a and 5b are closed, the connecting pipes 25a and 25b are removed, and the compressor 1 is disconnected from the refrigeration cycle. be able to.

At this time, the refrigerant inside the connecting pipes 25a and 25b is released into the atmosphere, but the amount thereof is extremely small when viewed from the entire refrigeration cycle, and most of the refrigerant is mostly the on-off valves 5a and 5a.
It is left on the side sealed by 5b.

When installing a new compressor,
The refrigeration cycle on the side of the condenser 2 and the evaporator 4 has open / close valves 5a, 5
b, and the hermetic compressor 11 itself is exposed to the atmosphere because the compressor opening / closing valves 15a and 15b have previously sealed therein the refrigerating machine oil necessary for operation and the refrigerant used in the refrigerating cycle. It is possible to install without connecting. After installing the hermetic compressor 11, the connecting pipe 25
If a service branch pipe is provided on a and 25b, vacuuming and gas charging are performed, and then pinching is performed, a closed cycle will be completed. Just start driving.

As described above, the air conditioner according to this embodiment has the hermetic compressor 1 having the compressor opening / closing valves 15a and 15b which can be opened / closed at the discharge side pipe connection portion and the suction side pipe connection portion, respectively.
1, the condenser 2, the expansion device 3, and the evaporator 4 are annularly connected by a refrigerant pipe, and openable and closable opening and closing are provided in the suction side and discharge side pipes near the hermetic compressor 11. Valves 5a and 5b, compressor opening / closing valves 15a and 15b, and opening / closing valve 5
Since the connecting pipes 25a and 25b for connecting a and 5b are provided, the compressor can be replaced with a minimum refrigerant discharge amount even when the compressor is replaced, and refrigeration exposed to the atmosphere during the replacement work. The part within the cycle can be minimized.

Further, a third embodiment of the air conditioner according to the present invention will be described with reference to FIG. In addition,
The same components as those of the first and second embodiments are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 3 is a refrigeration cycle diagram of an air conditioner according to a third embodiment of the present invention. In FIG. 3, 6a,
Reference numeral 6b is a solenoid valve provided in the suction side and discharge side pipes near the hermetic compressor 11, and 7 is a solenoid valve control device.

The operation of the air conditioner configured as above will be described below. During normal operation, when the hermetic compressor 11 operates, the solenoid valve control device 7 opens the solenoid valves 6a and 6b and closes them when stopped. Therefore, in the case of a separation type unit in which the hermetic compressor 11 is placed outdoors, even if there is a temperature difference between the indoor and outdoor temperatures while the compressor is stopped, the refrigerant does not move to the inside of the compressor and The phenomenon does not occur.

Further, in the case of an abnormality, the operation of the hermetic compressor 11 is stopped, the solenoid valve control device 7 closes the solenoid valves 6a and 6b, and when the compressor is replaced in this state, it will be explained in the second embodiment. Just do what you did.

As described above, the air conditioner according to the present embodiment has the hermetic compressor 1 having the open / close compressor opening / closing valves 15a and 15b at the discharge side pipe connecting portion and the suction side pipe connecting portion, respectively.
1, the condenser 2, the expansion device 3, and the evaporator 4 are annularly connected by a refrigerant pipe, and are closed when the power is not supplied to the suction side and the discharge side pipes near the hermetic compressor 11. Solenoid valves 6a and 6b, and a solenoid valve control device 7 that opens the solenoid valves 6a and 6b when the hermetic compressor 11 is operating and closes the solenoid valves 6a and 6b when the hermetic compressor 11 is stopped. Since the compressor opening / closing valves 15a, 15b and the connecting valves 25a, 25b for connecting the solenoid valves 6a, 6b are provided, the compressor can be replaced with a minimum amount of discharged refrigerant even when the compressor is replaced. At the same time, it is possible to minimize the internal portion of the refrigeration cycle that is exposed to the atmosphere during the replacement work, and further to prevent the stagnation phenomenon when the compressor is stopped.

In the first, second and third embodiments, the connecting portion between the on-off valves 5a and 5b and the compressor 1 and the connecting pipe 25.
Although the connecting portions of a and 25b have welding specifications, they may have joint specifications.

[0034]

As described above, according to the present invention, the compressor, the condenser, the expansion device, and the evaporator are annularly connected by the refrigerant pipe, and the suction side pipe and the discharge side pipe near the compressor are connected. Since each of them has an opening / closing valve that can be opened and closed, the compressor can be replaced with a minimum amount of discharged refrigerant even when the compressor is replaced.

Further, a hermetic compressor having a compressor opening / closing valve at each of the discharge side pipe connection portion and the suction side pipe connection portion, a condenser, a throttling device, and an evaporator are annularly formed by a refrigerant pipe. With connection, the suction side near the hermetic compressor,
Since it is equipped with an on-off valve that can be opened and closed in each of the discharge side pipes and a connecting pipe that connects the compressor on-off valve and the on-off valve, the minimum refrigerant discharge even when the compressor is replaced. The compressor can be replaced in volume and the portion of the refrigeration cycle that is exposed to the atmosphere during the replacement operation can be minimized.

Further, a hermetic compressor having a compressor opening / closing valve that can be opened and closed at each of the discharge side pipe connection portion and the suction side pipe connection portion, a condenser, a throttle device, and an evaporator are connected by a refrigerant pipe. A solenoid valve that is connected in an annular shape and that is closed in the pipes on the suction side and the discharge side near the hermetic compressor and that closes when the power is off, and opens the solenoid valve when the hermetic compressor is operating. When the hermetic compressor is stopped, a solenoid valve control device that closes the solenoid valve, and a connection pipe that connects the compressor opening / closing valve and the solenoid valve are provided. It is possible to replace the compressor with a minimum amount of refrigerant discharge, minimize the internal part of the refrigeration cycle exposed to the atmosphere during the replacement work, and prevent the stagnation phenomenon while the compressor is stopped. it can.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram in a first embodiment of an air conditioner according to the present invention.

FIG. 2 is a refrigeration cycle diagram in the second embodiment of the air conditioner according to the present invention.

FIG. 3 is a refrigeration cycle diagram in a third embodiment of the air conditioner according to the present invention.

[Explanation of symbols]

 1 Compressor 2 Condenser 3 Throttle device 4 Evaporator 5a, 5b Open / close valve 6a, 6b Solenoid valve 7 Solenoid valve control device 11 Closed type compressor 15a, 15b Compressor open / close valve 25a, 25b Connection pipe

Claims (3)

[Claims] 1. A compressor, a condenser, a throttling device, and an evaporator are annularly connected by a refrigerant pipe, and an opening / closing valve that is openable / closable is provided in each of a suction side pipe and a discharge side pipe near the compressor. An equipped air conditioner. 2. A hermetic compressor having a compressor opening / closing valve at each of a discharge side pipe connection portion and a suction side pipe connection portion, a condenser, a throttle device, and an evaporator are annularly formed by a refrigerant pipe. An air conditioner provided with a connection pipe that is connected and that connects the compressor opening / closing valve and an opening / closing valve that is openable / closable in the suction side and discharge side pipes near the hermetic compressor. 3. A hermetic compressor having a compressor opening / closing valve that can be opened and closed at each of a discharge side pipe connection part and a suction side pipe connection part, a condenser, a throttle device, and an evaporator are annularly formed by a refrigerant pipe. A solenoid valve that is connected and that is closed in the vicinity of the hermetic compressor at the suction side and the discharge side, and that is closed when the power is off.
A solenoid valve control device that opens the solenoid valve when the hermetic compressor is in operation and closes the solenoid valve when the hermetic compressor is stopped, and a connection that connects the compressor on-off valve and the solenoid valve. Air conditioner with pipe.