KR101639798B1 - Cleaning Equipment for pipes of refrigerator in air-conditioner and Cleaning method using the same - Google Patents

Abstract

According to an embodiment of the present invention, there is provided a refrigerant pipe cleaning apparatus in which a discharge pipe and an inflow terminal are connected to a gas pipe of a pipe to be cleaned and a liquid line for cleaning a refrigerant pipe by refrigerant circulation, And a liquid refrigerant separation unit connected to the recovery tank and separating the gas refrigerant and the liquid refrigerant from the gas refrigerant in the recovery tank before transferring the gas cleaning refrigerant vaporized by the heating of the heater to the compressor, A liquid separator connected to the liquid separator for compressing the gaseous refrigerant separated and provided in the liquid separator and a condenser connected to the compressor for condensing and liquefying the high temperature and high pressure gaseous refrigerant discharged from the compressor A condenser, a storage tank connected to the condenser and storing the liquid cleaning refrigerant condensed from the condenser, And a plurality of refrigerant channels connected to the tank, the liquid separator, the compressor, the condenser, and the storage tank and including at least one valve, and circulating the liquid cleaning refrigerant discharged from the storage tank, Remove various foreign substances including.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a refrigerant pipe cleaning apparatus and a cleaning method for a refrigeration air conditioner,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant pipe cleaning device and a cleaning method for a refrigerant air conditioner, and more particularly, to a refrigerant pipe cleaning device and a cleaning method capable of efficiently cleaning the inside of a refrigerant pipe with liquid refrigerant discharged from a compressor .

In general, when replacing the air-conditioner, existing refrigerant piping is buried on a wall or ceiling and is often reused as it is. If the refrigerant used in the existing air conditioner and the refrigerant used in the newly installed air conditioner are the same CFC (Chlorofluorocarbon) or HCFC (HydroChloroFluoroCarbon) refrigerant, existing refrigerant piping is a serious problem However, recently, the use of HFC (Hydrofluorocarbon) refrigerant has been increasing in place of the former CFC or HCFC due to environmental reasons such as ozone layer destruction.

When replacing an air conditioner using HFC refrigerant, it is necessary to clean the inside of the refrigerant pipe because refrigerant oil or other contaminants are already installed inside the refrigerant pipe in order to use the already installed refrigerant pipe as it is.

However, the following prior art document is a cleaning and regenerating device of a refrigerant circuit. In the refrigerant cleaning device according to the related art, mineral refrigerant (mineral oil) is used for CFC and HCFC refrigerant, Synthetic oil is used.

As a result, if mineral oil remains in the present refrigerant pipeline, it is mixed with synthetic oil to form a sludge-like sediment due to the chemical reaction, and the capillary of the replaced air conditioner is clogged by this pollutant, do. Also, the heat transfer performance of the condenser and the evaporator is deteriorated and the cooling ability is deteriorated.

Published Utility Model Publication No. 1995-0012004

An aspect of the present invention is to provide a refrigerant pipe cleaning apparatus and a cleaning method that can efficiently clean the inside of a refrigerant pipe with liquid refrigerant discharged from a compressor using a refrigerant recovery and regeneration device.

In another aspect of the present invention, there is provided a refrigerant pipe cleaning apparatus for recovering gas refrigerant by using a distillation-regenerated liquid refrigerant so as to enable efficient branch piping cleaning of a multi-air conditioner (system air conditioner) in which a plurality of indoor units are installed in one outdoor unit And a cleaning method.

The present invention relates to a refrigerant pipe cleaning device in which an outlet terminal and an inlet terminal are connected to a gas pipe of a cleaned refrigerant pipe and a liquid line for cleaning a refrigerant pipe by refrigerant circulation, A liquid separator connected to the recovery tank for separating the liquid refrigerant from the gas refrigerant before transferring the gaseous clean refrigerant vaporized by the heating of the heater in the recovery tank to the compressor; A condenser connected to the compressor and connected to the compressor for condensing and liquefying the high-temperature and high-pressure gas refrigerant discharged from the compressor, and a condenser connected to the condenser, A storage tank for storing the liquid cleaning refrigerant condensed from the condenser; A plurality of refrigerant channels connected to the condenser, the condenser, and the storage tank and including at least one valve, and circulating the liquid cleaning refrigerant discharged from the storage tank to remove various foreign substances including products adhering to the inside of the cleaned refrigerant pipe do.

Further, the refrigerant pipe cleaning apparatus according to an embodiment of the present invention may further include a heating device installed in the recovery tank, for heating the liquid cleaning refrigerant recovered after the piping cleaning in the recovery tank, and cooling the refrigerant reflection impurity contained in the liquid cleaning refrigerant, And an oil separator provided between the compressor and the condenser for separating and recovering the oil or compressor lubricant contained in the high temperature and high pressure gas refrigerant.

Further, the plurality of refrigerant channels of the refrigerant pipe cleaning apparatus according to an embodiment of the present invention may include a liquid line of the liquid line to be cleaned and a suction line of the cleaning system so that the gas-cleansing refrigerant is recovered from the liquid line of the line to be cleaned A second refrigerant passage branched from the first refrigerant passage and connected to the recovery tank for recovering the liquid cleaning refrigerant from the liquid line to be cleaned, a second refrigerant passage connected to the recovery tank, A third refrigerant channel connected at one end to the recovery tank and connected at the other end to the first refrigerant channel for transferring the refrigerant to the storage tank, and a condenser for compressing the gaseous clean refrigerant sucked into the compressor through the first refrigerant channel, A fourth flow path for connecting the compressor and the condenser to discharge the refrigerant to the storage tank, A sixth flow path for connecting the liquid rinsing liquid storage tank and the compressor suction portion on the first flow path to prevent overheating of the compressor suction portion, A sixth flow path connected to the gas pipe of the cleaned refrigerant pipe so as to be discharged to the gas pipe of the cleaned refrigerant pipe in the first cleaned refrigerant pipe, one end connected to the liquid cleaning refrigerant storage tank for recovering the liquid cleaning refrigerant in the cleaned refrigerant pipe, An eighth flow path connected to the seventh flow path, and a ninth flow path branched from the fourth flow path for keeping the cleaned refrigerant in a vacuum state in the pre-charge recovery tank and the cleaned refrigerant pipe in the recovery tank.

The refrigerant pipe cleaning apparatus according to an embodiment of the present invention may further include a filling port for filling the initial cleaning refrigerant and a level sensor mounted on the upper and lower portions of the storage tank and the recovery tank for detecting the amount of liquid cleaning refrigerant, .

Further, the refrigerant pipe cleaning apparatus according to an embodiment of the present invention may further include a detecting unit installed in the compressor and measuring pressure, and a controller controlling the operation of the compressor according to the detection result of the detecting unit.

A refrigerant premix cleaning method by a refrigerant pipe cleaning apparatus according to an embodiment of the present invention includes a vacuum step of performing a vacuum operation on a refrigerant pipe and a recovery tank to be cleaned, a refrigerant filling step of injecting the liquid cleaning refrigerant into a recovery tank, A cleaning step of cleaning the refrigerant pipe through the liquid cleaning refrigerant, a liquid recovery step of recovering the liquid cleaning refrigerant remaining in the refrigerant pipe to be cleaned, and a gas recovery device for recovering gas refrigerant remaining in the refrigerant pipe to be cleaned .

According to the present invention, according to the present invention, when the refrigerating air conditioner is replaced, the cleaning circuit of the cleaned refrigerant pipe after the removal of the indoor unit and the outdoor unit is connected to the pipe cleaning device of the present invention to circulate the liquid cleaning refrigerant, It is possible to prevent damages of the compressor caused by these pollutants, deterioration of the cooling ability, and the like in advance.

In addition, since the same liquid cleaning refrigerant used in the existing piping circulates through the closed pipeline to be cleaned, impurities are removed and the refrigerant is not consumed and the cleaning efficiency is high. Especially, the liquid cleaning refrigerant recovered to the recovery tank after the cleaning is distilled It is possible to maintain a clean refrigerant state at all times and to efficiently perform pipeline cleaning through circulation of clean refrigerant and to completely recover the cleaned refrigerant from the refrigerant pipe after the cleaning, so that the new system is not adversely affected.

1 is a schematic view of a refrigerant pipe cleaning apparatus according to an embodiment of the present invention;
Fig. 2 is a schematic view showing a state in which the refrigerant pipe cleaning apparatus shown in Fig. 1 is connected to a device to be cleaned. Fig.
3 is a schematic flow chart of a refrigerant pipe cleaning method according to one embodiment of the present invention.
FIG. 4 is a schematic use state of a refrigerant pipe cleaning apparatus according to an embodiment of the present invention; FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a refrigerant pipe cleaning apparatus according to an embodiment of the present invention. As shown in the figure, the refrigerant pipe cleaning apparatus 100 is connected to a device to be cleaned to clean the refrigerant pipe.

More specifically, the refrigerant pipe cleaning apparatus 100 includes a recovery tank 110, a compressor 120, a liquid separator 130, an oil separator 140, a condenser 150, and a storage tank 160.

The refrigerant pipe cleaning apparatus 100 connects the recovery tank 110, the compressor 120, the liquid separator 130, the oil separator 140, the condenser 150, and the storage tank 160, And a plurality of freezing flow paths (L) including a valve (V).

The refrigerant flow path for cleaning the refrigerant piping of the plurality of freezing flow paths L is connected to the liquid line of the liquid line to be cleaned and the cleaning system suction line so as to recover gas cleansing refrigerant from the liquid line of the liquid line to be cleaned A first refrigerant passage (L1) connecting the suction port of the compressor without passing through a tank, a second refrigerant passage branched from the first refrigerant passage to be connected to the recovery tank for recovering the liquid cleaning refrigerant from the liquid line of the cleaned refrigerant pipeline, A third refrigerant passage L3, one end of which is connected to the recovery tank and the other end of which is connected to the first refrigerant passage, and a third refrigerant passage L3 which is connected to the first refrigerant passage for conveying the purified gas- A fourth flow path (L4) for connecting the compressor and the condenser to compress the gaseous clean refrigerant sucked into the compressor through the third refrigerant passage and discharge the refrigerant to the condenser, A fifth flow path (L5) for connecting the condenser and the storage tank to store the cleaned refrigerant in the liquid state as the storage tank, and a fifth flow path (L5) for preventing overheat of the compressor suction part or for controlling the pressure of the storage tank, A sixth flow path L6 connecting the compressor suction port on the first flow path to the cleaned refrigerant pipeline gas line so that the liquid cleaning refrigerant is discharged to the cleaned refrigerant pipeline from the storage tank, An eighth flow path L8 for one end to be connected to the liquid rinsing liquid storage tank and the other end to be connected to the seventh flow path so as to pressurize the liquid rinsing liquid refrigerant in the cleaned liquid refrigerant pipe, And a ninth flow path L9 branched from the fourth flow path for keeping the pre-fill recovery tank and the cleaned refrigerant piping in a vacuum state in the tank.

The refrigerant pipe cleaning apparatus 100 may further include a heater 170 connected to the recovery tank 110.

The upper level sensor 111 and the lower level sensor 112 are mounted on the recovery tank 110 and the upper level sensor 161 and the lower level sensor 162 may be mounted on the storage tank 160. have.

Hereinafter, the respective technical constructions and the action and effect of the organic combination thereof will be described in detail.

First, the recovery tank 110 is for filling the initial liquid cleaning refrigerant or recovering the piping cleaning liquid cleaning refrigerant.

The liquid separator 130 is connected to the recovery tank 110 and supplies the gas cleaning refrigerant vaporized by the heating of the heater 170 to the recovery tank 110, For separating refrigerant and liquid refrigerant.

The compressor 120 is connected to the liquid separator 130 and sucks the gas refrigerant separated and provided by the liquid separator 130 and discharges the gas refrigerant into the high temperature and high pressure gas refrigerant.

The oil separator 140 is connected to the compressor 120 for separating and recovering oil or compressor lubricant contained in the high-temperature and high-pressure gas refrigerant.

Next, the condenser 150 is used for condensing and liquefying the high-temperature, high-pressure gas refrigerant discharged from the compressor 120, and may be air-cooled.

And the storage tank 160 is connected to the condenser and is for storing condensed liquid cleaning refrigerant from the condenser.

The heater 170 is installed in the recovery tank 110 and separates refrigerant in the liquid cleaning refrigerant recovered after piping cleaning in the recovery tank 110 from the refrigerant in a distillation regeneration mode .

In addition, the refrigerant pipe cleaning apparatus 100 according to an embodiment of the present invention includes sensing means for measuring the pressure of each component, that is, a low pressure sensor, a pressure gauge, A pressure sensor, a safety valve, and the like.

Also, the pressure signal detected by the detecting means is used as an input signal of a control unit for controlling the operation of the compressor, and is outputted to a display screen.

More specifically, the low pressure sensor is a sensor for measuring the suction pressure of the compressor 120. When the refrigerant in the recovery tank 110 is sucked, the measured pressure value is output to the display screen, When the compressor 120 is operated below the set value, the controller 120 senses the operation of the compressor 120 and stops the operation of the compressor 120.

The high pressure sensor provided in the discharging portion of the compressor 120 is a sensor for detecting the high pressure state of the compressor 120 and outputs a high pressure state of the compressor 120 on the display screen , The compressor will stop operating if operating above set pressure.

The high pressure cut-out switch applied to the condenser 150, which can be implemented in an air-cooling type, may include a fan 151 installed in the condenser 150 when the condenser 150 is operated at a set pressure or higher And performs a function of stopping the operation of the fan when the condenser operates below the set pressure.

A safety valve is provided in the recovery tank 110 and the storage tank 160. When the pressure in the tank is equal to or higher than a preset pressure value,

Fig. 2 is a schematic configuration diagram of the refrigerant pipe cleaning apparatus shown in Fig. 1 connected to the device to be cleaned.

As shown in the figure, the refrigerant pipe cleaning apparatus 100 is connected to the cleaning circuit 200 of the device to be cleaned.

In addition, the cleaning circuit 200 may remove the refrigerant in the existing refrigerant pipe by using a compressor (pump-down) in the outdoor unit of the air conditioner (system air conditioner) or using a separate recovery device, and then remove the indoor unit and the outdoor unit , The gas pipe (210) and the liquid line (220) are connected by a by-pass pipe (230) for each indoor unit in order to constitute a closed refrigerant circulation circuit after the indoor unit is removed, and a flow of rinsing refrigerant is selectively blocked Closing valve 240 is provided.

The gas pipe 210 and the liquid line 220 to be cleaned are connected to the output terminal 181 and the input terminal 182, which are the valves of the refrigerant pipe cleaning apparatus 100, And the cleaning circuit 200 are connected to each other.

In the cleaning circuit 200, R-22, which is a cleaning refrigerant, is circulated to clean the existing connecting pipe including the gas line 210 and the liquid line 220. Further, in order to constitute the closed refrigerant circulation, the liquid refrigerant tube and the gas refrigerant tube are connected to each indoor unit after the indoor unit is removed.

As described above, the cleaning circuit 200 includes a by-pass pipe 230 for directly connecting the end of the gas line and the end of the liquid line for each branch pipe, and a by- Off valves 240 are mounted.

A valve 250 is installed at the other end of the liquid line 220 connected to the opening and closing valve 240 at one end of the cleaning circuit 200. The valve 250 and the refrigerant pipeline cleaning device 100 A valve 270 is provided at the other end of the gas pipe 210 connected to the opening and closing valve 240 at one end and the valve 270 is connected to the valve 270 at the other end, A pipe 280, which is a gas line, is connected between the valve 181 provided at the output terminal of the refrigerant pipe cleaning apparatus 100.

Hereinafter, the cleaning method of the refrigerant pipe will be described in detail with reference to FIG.

3 is a schematic flowchart of a refrigerant pipe cleaning method according to an embodiment of the present invention.

As shown in the figure, the refrigerant pipe cleaning method includes a vacuum step (S10) for performing a vacuum operation on the refrigerant pipe to be cleaned and a recovery tank, a refrigerant filling step (S20) for injecting the liquid cleaning refrigerant into the recovery tank, A cleaning step (S30) of cleaning the refrigerant pipe through the cleaning refrigerant; a liquid recovery step (S40) of recovering the liquid cleaning refrigerant remaining in the refrigerant pipe to be cleaned; and recovering the gas refrigerant remaining in the refrigerant pipe to be cleaned And a gas recovery step (S50).

More specifically, after connecting the refrigerant pipe cleaning apparatus 100 and the cleaning circuit 200, liquid cleaning refrigerant is injected into the refrigerant pipe cleaning apparatus 100, and the liquid cleaning refrigerant smoothly flows through the cleaned refrigerant pipe A vacuum operation S10 is performed on the recovery tank 110 and the refrigerant pipe to be cleaned.

At this time, the valves V1, V2, and V3 provided on the refrigerant channel of the refrigerant pipe cleaning apparatus 100 are opened while the service valve V4 is opened, the compressor 120 is operated, The operation of the compressor 120 is automatically stopped when the internal pressure of the compressor 110 becomes equal to or less than the set value.

When the vacuum operation of the recovery tank 110 and the cleaning circuit 200 is completed, the service valve V3 is closed. A vacuum pump may be installed before the compressor for vacuuming the recovery tank 110 and the refrigerant pipe to be cleaned.

After the vacuum operation of the recovery tank 110 is completed, all the valves (the electromagnetic valves) provided on the refrigerant flow path are turned off to inject the liquid cleaning refrigerant into the recovery tank 110, 110, the stop valve V5 (drain / fill valve) is connected to the stop valve V5 and the liquid refrigerant outlet valve of the refrigerant cylinder is opened. In this case, when the injection amount of the refrigerant reaches the upper level sensor 111 installed in the recovery tank 110, the injection of the refrigerant is detected and the refrigerant injection is automatically stopped. In this way, the step of filling refrigerant (S20) is implemented. Further, the amount of the initial refrigerant injected can be appropriately adjusted in accordance with the length of the cleaned refrigerant pipe.

Next, the cleaning refrigerant initially charged to the recovery tank 110 or the cleaning refrigerant recovered after the pipe cleaning is to be transferred to the storage tank 160 for the next cleaning. A valve 250 connected to an inlet port 182 of the cleaning device and a liquid line 220 which is a liquid refrigerant line of the cleaning circuit, a cleaning device outlet port 181 and a gas line The valve 270 connected to the compressor 210 is opened and the compressor 120 is operated while the valves V1, V2 and V6 are on, The cleaned refrigerant is heated by the installed heater 170 to separate the oil and the impurities.

Next, the vaporized gas cleaning refrigerant is sucked, discharged at a high temperature and a high pressure, and condensed and stored in the storage tank 160 via the air-cooled type condenser 150 and stored.

As described above, an accumulator 130 for separating liquid refrigerant is disposed at the suction end of the compressor 120, and a liquid cleaning refrigerant (not shown) is disposed between the discharge portion of the compressor 120 and the condenser 150. [ And an oil separator 140 for separating and recovering refrigerant recovered from the compressor.

The amount of liquid cleaning refrigerant stored in the storage tank 160 is sensed by the liquid level sensors 161 and 162 installed in the upper and lower portions of the storage tank 160. When the amount of liquid refrigerant is sensed by the upper level sensor 161, The liquid level sensor 112 installed at the lower part of the recovery tank 110 detects the amount of liquid refrigerant and stops the heating of the refrigerant when the amount of liquid cleaning refrigerant becomes less than the level sensor.

Next, in a state where the opening / closing valve of the branch pipe to be cleaned is opened and the valves (electromagnetic valves) (V1, V2, V6, V7) provided on the refrigerant channel are closed (S40). ≪ / RTI > At this time, the liquid cleaning refrigerant stored in the storage tank 160 is discharged to the gas line 280 to be cleaned connected to the cleaning device output terminal 181. As shown by the arrow, the gas line 210 to be cleaned, The liquid line connection pipe 230 and the liquid line 220 are sequentially cleaned and connected to the recovery tank 110 through the inlet terminal 182 of the refrigerant pipe cleaning apparatus connected to the liquid line Is recovered.

The refrigerant line cleaning is performed by the lower liquid coolant level sensor 162 of the storage tank 160 or by the upper level sensor 111 of the recovery tank 110 Clean until it is sensed.

Next, when the branch pipe cleaning to be cleaned is completed (the amount of liquid cleaning liquid in the recovery tank is stopped by detection by the upper level sensor) among the branch systems to be cleaned, the other branch pipe opening / closing valve is opened, The refrigerant pipe cleaning operation is repeated.

Next, after completion of the cleaning of the refrigerant pipe by the liquid cleaning refrigerant, the liquid cleaning refrigerant and the gas cleaning refrigerant remaining in the refrigerant pipe must be completely recovered.

To this end, the valves (electronic valves) V1, V2, V6 and V8 provided on the refrigerant passage are turned on with all the open / close valves of the branch pipes opened, and then the compressor 120 is operated.

Next, the compressor 120 sucks gas-cleaning refrigerant in the recovery tank 110 to lower the pressure of the recovery tank, and the sucked gaseous refrigerant is condensed and stored in the storage tank 160.

At this time, the gas refrigerant in the storage tank 160 is discharged through the separate piping to the refrigerant pipeline to be cleaned to recover the liquid cleaning refrigerant remaining in the refrigerant pipeline to be cleaned. And the liquid refrigerant recovery is stopped when the liquid refrigerant is detected by the upper liquid level sensor 111, 161 of the recovery tank or the storage tank within a predetermined time.

Then, when the liquid cleaning and refrigerant recovery is completed, the valves V9 and V6 are automatically switched to the gas cleaning refrigerant recovery state in the on state. Further, the gas refrigerant remaining in the pipe to be cleaned is sucked up to a proper vacuum state by the compressor through the gas refrigerant recovery pipe, and is stored as a liquefied liquid in the storage tank. The arrival of the proper vacuum pressure can be confirmed by the pipe vacuum pressure gauge.

When the gas cleaning refrigerant recovery is completed, the piping cleaning operation is completed, the connection valve between the cleaning device and the cleaning circuit is closed, and the connection hose is removed.

4 is a schematic view illustrating a refrigerant pipe cleaning apparatus according to an embodiment of the present invention. As shown in the figure, the refrigerant pipe cleaning apparatus 100 is connected to a plurality of indoor units 10, 20, 30, and 40, respectively. As shown by arrows, the liquid cleaning refrigerant is circulated, and various foreign materials including products adhered to the interior of the cleaned refrigerant pipe contained in the plurality of indoor units can be selectively removed by valve operation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various modifications may be made by those skilled in the art without departing from the scope of the appended claims.

110: recovery tank 111, 112: level sensor
120: compressor 130: liquid separator
140: Oil separator 150: Condenser
151: Fan 160: Storage tank
161, 162: Level sensor
170: heater 181: output terminal
182: input terminal 200: cleaning circuit
210: gas line 220: liquid line
230: by-pass tube 240: opening / closing valve
250: valves 260, 280: piping
270: Valve
10, 20, 30, 40: indoor unit
V1, V2, V3, V4, V5, V6, V7, V8, V9:

Claims (6)

A refrigerant pipe cleaning apparatus in which an outlet terminal and an inlet terminal are connected to a gas pipe of a cleaned refrigerant pipe and a liquid line for cleaning a refrigerant pipe by refrigerant circulation,
A recovery tank for filling initial liquid cleaning refrigerant or for recovering piping cleaning liquid cleaning refrigerant;
A liquid separator connected to the recovery tank for separating the liquid refrigerant from the gas refrigerant before transferring the gas cleaning refrigerant vaporized by the heating of the heater in the recovery tank to the compressor;
A compressor connected to the liquid separator and compressing the gaseous refrigerant separated and provided in the liquid separator;
A condenser connected to the compressor for condensing and liquefying the high-temperature and high-pressure gas refrigerant discharged from the compressor;
A storage tank connected to the condenser and storing the liquid cleaning refrigerant condensed from the condenser; And
And a plurality of refrigerant channels connecting the recovery tank, the liquid separator, the compressor, the condenser, and the storage tank and including at least one valve,
The liquid cleaning liquid refrigerant discharged from the storage tank is circulated to remove various foreign substances including products adhering to the inside of the cleaned refrigerant pipe,
The plurality of refrigerant channels
A first refrigerant passage connecting the compressor inlet through the cleaned refrigerant pipe and the cleaning system suction line without passing through the recovery tank so that gas cleansing refrigerant is recovered from the liquid line of the cleaned refrigerant pipeline;
A second refrigerant passage branched from the first refrigerant passage and connected to the recovery tank for recovering the liquid cleaning refrigerant from the liquid line of the cleaned refrigerant pipe;
A third refrigerant passage having one end connected to the recovery tank and the other end connected to the first refrigerant flow path for transferring the distillation-stagnated gas cleaning refrigerant to the storage tank;
A fourth flow path for connecting the compressor and the condenser to compress the gaseous clean refrigerant sucked into the compressor through the first refrigerant passage or the third refrigerant passage and discharge the refrigerant to the condenser;
A fifth flow path connecting the condenser and the storage tank to store the condensed liquid rinsing refrigerant in the storage tank;
A sixth flow path connecting the liquid rinsing liquid storage tank and the compressor suction part on the first flow path for preventing overheating of the compressor suction part or for regulating the pressure of the storage tank;
A seventh flow path connected to the gas pipe of the cleaned refrigerant pipe so that the liquid cleaning refrigerant is discharged from the storage tank to the gas pipe of the cleaned refrigerant pipe;
An eighth flow path for one end to be connected to the liquid rinsing liquid storage tank and the other end to be connected to the seventh flow path so as to pressurize the liquid rinsing liquid refrigerant in the cleaned refrigerant pipe;
And a ninth passage branched from the fourth passage for keeping the cleaning refrigerant in the recovery tank in a vacuum state before the filling tank and the cleaning fluid to be cleaned.
The method according to claim 1,
A heater mounted on the recovery tank for heating the liquid cleaning refrigerant recovered in the recovery tank after piping cleaning and separating refrigerant adhering impurities contained in the liquid cleaning refrigerant from the refrigerant; And
Further comprising an oil separator provided between the compressor and the condenser for separating and recovering oil or compressor lubricant contained in the high-temperature and high-pressure gas refrigerant.
delete The method according to claim 1,
And a level sensor mounted on upper and lower portions of the storage tank and the recovery tank, respectively, for sensing the amount of liquid cleaning refrigerant, and a filler for filling the initial cleaning refrigerant.
The method according to claim 1,
Further comprising a detecting unit installed in the compressor and measuring a pressure of the refrigerant, and a controller controlling the operation of the compressor in response to the detection result of the detecting unit.
A refrigerant premix cleaning method using a refrigerant pipe cleaning apparatus according to any one of claims 1, 2, 4, and 5,
A vacuum step of performing a vacuum operation on the refrigerant pipe to be cleaned and the recovery tank;
A coolant filling step of injecting the liquid cleaning refrigerant into the recovery tank;
A cleaning step of cleaning the refrigerant pipe through the liquid cleaning refrigerant;
A liquid recovery step of recovering the liquid cleaning refrigerant remaining in the refrigerant pipe to be cleaned; And
And a gas recovery step of recovering gas refrigerant remaining in the inside of the refrigerant pipe to be cleaned.

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