JP3491629B2 - Piping cleaning device and piping cleaning method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cleaning device, and more particularly to a cleaning device for cleaning refrigerating machine oil remaining in a pipe when a refrigerant used in a refrigerating and air-conditioning system is replaced and refrigerating machine oil is also replaced at the same time. It is about.

[0002]

2. Description of the Related Art FIG. 27 shows a separate type refrigerating and air-conditioning apparatus generally used conventionally. In FIG. 27,
Reference numeral 28 denotes a heat source machine, which includes a compressor 1, a four-way valve 29, a heat source side heat exchanger 30, a first connection valve 12c, and a second connection valve 12.
d, the accumulator 10 is built in. An indoor unit 22 includes an electronic expansion valve 24 and a use side heat exchanger 23. The heat source unit 28 and the indoor unit 22 are installed at distant places and are connected by the first connecting pipe 4 and the second connecting pipe 6 to form a refrigeration cycle.

One end of the first connecting pipe 4 is connected to the four-way valve 29 via the first connecting valve 12c.
The other end is connected to the use side heat exchanger 23. One end of the second connection pipe 6 is connected to the heat source side heat exchanger 30 via the second connection valve 12d, and the other end of the second connection pipe 6 is connected to the electronic expansion valve 24. Further, an oil return hole 1 is provided at the bottom of the U-shaped tubular outflow pipe of the accumulator 10.
0a is provided.

The flow of the refrigerant in this refrigerating and air conditioning system will be described with reference to FIG. In the figure, the solid line arrow shows the flow of the cooling operation, and the broken line arrow shows the flow of the heating operation. First, the flow of the cooling operation will be described. The high-temperature and high-pressure gas refrigerant compressed by the compressor 1 flows into the heat source side heat exchanger 30 through the four-way valve 29, and exchanges heat with a heat source medium such as air and water to be condensed and liquefied.
The condensed and liquefied refrigerant flows into the electronic expansion valve 24 through the second connecting valve 12d and the second connecting pipe 6, where it is depressurized to a low pressure and becomes a low pressure gas-liquid two-phase state, and the use side heat exchanger 23
At the same time, it exchanges heat with the medium on the use side such as air to evaporate and gasify. The evaporated gasified refrigerant returns to the compressor 1 via the first connection pipe 4, the first connection valve 12c, the four-way valve 29, and the accumulator 10.

Next, the flow of heating operation will be described. Compressor 1
The high-temperature and high-pressure gas refrigerant compressed by means of the four-way valve 29, the first connection valve 12c, and the first connection pipe 4 flows into the heat exchanger 23 on the use side, where heat and a medium on the use side such as air and heat are exchanged. Replace and condense and liquefy. The condensed and liquefied refrigerant is the electronic expansion valve 24.
Into the low-pressure gas-liquid two-phase state where it is depressurized to a low pressure, passes through the second connection pipe 6 and the second connection valve 12d, and is heated in the heat-source-side heat exchanger 30 as a heat source medium such as air or water. Heat exchange with and evaporate and gasify. The evaporated and gasified refrigerant returns to the compressor 1 via the four-way valve 29 and the accumulator 10.

[0006] Conventionally, most of such refrigerating and air-conditioning systems are CFC (chlorofluorocarbon) type refrigerants and HCFCs.
(Hydrochlorofluorocarbon) type refrigerants have been used, but since chlorine contained in these molecules destroys the ozone layer in the stratosphere, CFC type refrigerants have already been completely abolished, and
Production restrictions on CFC-based refrigerants have also started.

In place of these, a refrigerating and air-conditioning system using an HFC (hydrofluorocarbon) type refrigerant which does not contain chlorine in its molecule has been put into practical use. CFC type refrigerant and HC
When the refrigerating and air-conditioning system using the FC type refrigerant is aged, it is necessary to replace it with a refrigerating and air-conditioning system using the HFC type refrigerant because these refrigerants are completely abolished and production is regulated.

When the refrigerating and air-conditioning system is a separate type constituted by the heat source unit 28, the indoor unit 22 and the connecting pipes 4 and 6 connecting them, the heat source unit 28 and the indoor unit 22 are
Since the refrigerating machine oil / organic material / heat exchanger used for the FC-based refrigerant is different from those of the HCFC-based refrigerant and the CFC-based refrigerant, it is necessary to replace it with a dedicated HFC-based refrigerant. Originally, the heat source unit 28 for CFC-based refrigerants and HCFC-based refrigerants
Since the indoor unit 22 has deteriorated and needs to be replaced, the replacement is relatively easy.

On the other hand, the connection pipes 4 and 6 are difficult to replace with new pipes when the pipes are long or buried in a building such as a pipe shaft or a ceiling, and are less likely to deteriorate. CFC refrigerant and HCF
If the connection pipes 4 and 6 used in the refrigeration cycle device using the C-based refrigerant can be used as they are, the piping work can be simplified.

[0010]

However, the connecting pipes 4 and 6 used in the refrigerating and air-conditioning apparatus using the CFC-based refrigerant or the HCFC-based refrigerant are connected to the refrigerating and air-conditioning apparatus using the CFC-based refrigerant or the HCFC-based refrigerant. Mineral oil, which is the refrigerating machine oil, remains.

FIG. 28 is a diagram showing a critical solubility curve showing the solubility of the refrigerating machine oil for HFC type refrigerant and the HFC type refrigerant (R407C) when mineral oil is mixed. Indicates temperature (° C.). When the refrigerating machine oil is mixed with the refrigerant, it may be dissolved in the refrigerant to be compatible with it or may be separated without being dissolved, and the boundary point of compatibility and separation depends on the temperature. The compatible range is in the temperature range between the lower limit temperature and the upper limit temperature, and the dissolution characteristics are represented by the critical solubility curve in FIG. Mineral oil is mixed in refrigerating machine oil (synthetic oil such as ester oil and ether oil) of a refrigerating and air-conditioning apparatus using an HFC-based refrigerant, and as the amount of the mineral oil increases, the compatible temperature range becomes narrower. Then, if a certain amount or more is mixed, FIG.
As shown in, the compatibility with the HFC-based refrigerant is lost, and when the liquid refrigerant is stored in the accumulator 10, the HFC-based refrigerant refrigerating machine oil separates and floats in the upper layer of the liquid refrigerant,
The refrigerating machine oil may not return to the compressor 1 from the oil return hole 10a in the lower part of the accumulator 10, and the sliding part of the compressor 1 may be seized. Further, in the conventional CFC-based refrigerant, mineral oil was used as the lubricating oil, whereas in the HFC-based refrigerant, synthetic oil was used as the lubricating oil, so if the mineral oil remains in the existing refrigerant pipe, In the newly installed refrigerant circuit, there is a problem that foreign matter (contamination) occurs, which blocks the throttle mechanism and damages the compressor.

In response to the above problem, the connection pipes 4 and 6 which have been used in the refrigerating and air-conditioning apparatus using the CFC-based refrigerant or the HCFC-based refrigerant in the related art are washed with a dedicated cleaning liquid (dissolving mineral oil). HCFC141b and HCFC225)
It is performed by liquid-sealing and dissolving and cleaning the mineral oil remaining in the pipe.

In this case, there are the following problems. First, the cleaning liquid used is an HCFC refrigerant, and the ozone depletion potential is not 0.
This is inconsistent with the replacement of CFC refrigerants with HFC refrigerants. In particular, HCFC141b has an ozone depletion coefficient of 0.
It is as large as 11, and it is a problem to clean the piping by using this refrigerant.

Secondly, the cleaning liquid used is not completely safe in flammability and toxicity. HC
FC141b is flammable, low toxicity, and HCF
C225 is nonflammable but has low toxicity.

Third, since the cleaning liquid has a high boiling point (H
32 ° C for CFC141b, 51-56 for HCFC225
(° C) The cleaning liquid after cleaning is less likely to evaporate and remains attached to the pipes, and in order to recover them, it takes time for the recovery process such as cleaning by blowing the cleaning liquid with nitrogen gas.

Further, even if an attempt is made to perform cleaning using a cleaning liquid which does not cause environmental problems as described above or is easy to collect, there is almost no such cleaning liquid that is soluble in mineral oil. There was a problem that it was not done promptly.

The present invention has been made in order to solve such a problem, and provides a cleaning device which can clean a pipe quickly and without causing an environmental problem, and replaces a refrigerant used in a refrigerating and air-conditioning device. Therefore, it is an object of the present invention to provide a refrigerating and air-conditioning apparatus that simplifies the re-installation work of the pipe by cleaning the pipe when updating the device and using the washed existing pipe. Further, the present invention provides versatility and reliable completion of cleaning work by pipe cleaning operation using a heat source device for refrigeration and air conditioning, and also provides a method for replacing refrigeration and air conditioning equipment with high reliability and easy replacement of refrigerant. It is intended.

[0018]

[Means for Solving the Problems] Pipe washing according to the present invention
Purifier connects compressor, condenser, expander, evaporator
Clean the existing pipe with the refrigerant conveyed by the compressor.
Flow into the existing equipment and the collection device that collects the object to be cleaned.
Refrigerant to be a gas-liquid two-phase flow with a dryness of 0.2 to 0.9
In addition, the heat exchange capacity of the condenser, the flow resistance of the expansion device and the evaporation
Control that controls at least one of the heat exchange capabilities of the reactor
It is equipped with a control device.

Further, the discharge temperature sensor is connected to the discharge side pipe of the compressor.
Sensor equipped with a sensor, the discharge temperature detected by the discharge temperature sensor
Is controlled so that is less than or equal to a predetermined target value.
Is to control.

In addition, the heat of condensation of the refrigerant obtained in the condenser
Part or all of it is exchanged as heat of vaporization in the evaporator
It is equipped with a high and low pressure heat exchanger.

Further, the physical state of the refrigerant is predetermined.
Change the heat exchange rate of the high and low pressure heat exchanger to reach the target value.
It is what makes me.

Further, the evaporation flowing out of the high and low pressure heat exchanger
A gas cooling means for cooling the formed refrigerant,
That changes the cooling capacity of the refrigerant depending on the physical state of the refrigerant.
is there.

The pipe cleaning apparatus according to the present invention is
Connect the compressor, condenser, expansion device, evaporator,
Clean the existing pipes with the transported refrigerant to clean the objects to be cleaned.
The recovery device for recovery and the refrigerant that flows into the existing pipe are the gas-liquid two
The heat exchange capacity of the condenser and the flow of the expansion device
At least one of dynamic resistance and heat exchange capacity of evaporator 1
High pressure to the control device that controls the
A force sensor and a condensation outlet temperature sensor on the outlet side piping of the condenser
High pressure and condensation detected by high pressure sensor
Calculated from the condenser outlet temperature detected by the outlet temperature sensor
The dryness of the gas-liquid two-phase refrigerant to be discharged
The control device is controlled so that the standard range is achieved.

The pipe cleaning apparatus according to the present invention is
Connect the compressor, condenser, expansion device, evaporator,
Clean the existing pipes with the transported refrigerant to clean the objects to be cleaned.
The recovery device for recovery and the refrigerant that flows into the existing pipe are the gas-liquid two
The heat exchange capacity of the condenser and the flow of the expansion device
At least one of dynamic resistance and heat exchange capacity of evaporator 1
Control device to control the low pressure and the suction side pipe of the compressor.
With a force sensor, the low pressure detected by the low pressure sensor
Control the pressure so that it exceeds a predetermined target value
It controls the control device.

The pipe cleaning apparatus according to the present invention is
Connect the compressor, condenser, expansion device, evaporator,
Clean the existing pipes with the transported refrigerant to clean the objects to be cleaned.
The recovery device for recovery and the refrigerant that flows into the existing pipe are the gas-liquid two
The heat exchange capacity of the condenser and the flow of the expansion device
At least one of dynamic resistance and heat exchange capacity of evaporator 1
High pressure to the control device that controls the
Equipped with a force sensor,
Control the pressure so that it exceeds a predetermined target value
It controls the control device.

The pipe cleaning apparatus according to the present invention is
Compressors, condensers, expanders, evaporators, accumulators
Connect and wash the existing pipe with the refrigerant carried by the compressor.
Flows into the existing equipment and the collection device that cleans and collects the objects to be cleaned.
The heat exchange capacity of the condenser so that the refrigerant
Force, the flow resistance of the expander and the heat exchange capacity of the evaporator
At least one of the control device and the compressor suction
Equipped with a low pressure sensor and suction temperature sensor in the inlet piping
The low pressure and suction temperature detected by the low pressure sensor
Inhalation excess calculated from the inhalation temperature detected by the sensor
The degree of heat is designed to prevent refrigerant from accumulating in the accumulator.
Control device so that the specified target value
It is something.

Furthermore, the operating capacity of the compressor is variable.

Further, depending on the operating capacity of the compressor, the refrigerant
It determines the control target value of the physical state.

Further, a refrigerant is added depending on the flow resistance of the existing pipe.
The control target value of the physical state of is determined.

Furthermore, the physical state of the refrigerant depends on the ambient temperature.
The control target value of is determined.

The pipe cleaning apparatus according to the present invention is
Connect the heat source unit with a compressor and the heat source unit to the pipe to be cleaned.
With a mineral oil recovery device that is connected to the heat source machine or mineral oil recovery
Discharged from compressor to at least one of the devices
Equipped with a heat exchanger that condenses the refrigerant, and a mineral oil recovery device.
Expansion to depressurize the refrigerant condensed by the heat exchanger
Separation of the object to be cleaned from the refrigerant flowing through the device and the piping to be cleaned
The cleaning object recovery means for recovery and the heat source side control of the heat source machine
Controls the operating capacity of the compressor by receiving operating information from the controller.
And a cleaning side control device.

The pipe cleaning apparatus according to the present invention is
Transmission of operation information to the compressor and operation control device installed outside
A heat source device having a heat source side control device that enables the heat source device;
Having a mineral oil recovery device connected between the pipe to be cleaned,
At least one of the heat source machine and the mineral oil recovery system
Equipped with a heat exchanger that condenses the refrigerant discharged from the compressor
And was condensed by the heat exchanger in the mineral oil recovery unit.
The expansion device that decompresses the refrigerant and the cold that flows through the pipe to be washed.
Cleaning means for separating and recovering the cleaning object from the medium, and heat
Driving information between the source control device and / or the driving control device
Equipped with a cleaning-side control device that can transmit information
The equipment is operating information from the heat source side controller and cleaning side control.
The heat exchange amount of the heat exchanger or
Smaller amount of expansion device throttling or compressor operating capacity
Both control either one.

Further, a heat source side control device included in the heat source device,
Between or outside the washing-side control device of the mineral oil recovery device
Operation control device, heat source side control device and cleaning side control
There is a problem in the transmission of driving information between the
Stop the compressor installed in the heat source
The heat source side control device is provided with the function.

Further, the heat source side control device and the cleaning side control device
Alternatively, at least one of the operation control devices should be washed with a pipe.
Storage means or display to record the progress of clean operation
It is provided with a display means.

Further, the heat source side control device and the cleaning side control device
Or having at least one of the operation controller
Record the completion or incompletion of the pipe cleaning operation in the storage means.
It is something.

Furthermore, the pipe cleaning operation was not completed and was interrupted.
In this case, the pipe cleaning operation should be based on the progress record of the pipe cleaning operation.
Cleaning side control device or operation control function to restart clean operation
It is provided for at least one of the devices.

Further, the heat source side control device is equipped with a pipe cleaning operation.
If the completion record is not recorded, wash the pipes in the heat source unit.
It prohibits operations other than clean operation.

The pipe cleaning method according to the present invention is
Remove the existing refrigeration and air-conditioning system from the existing piping.
And a pipe cleaning device with a compressor on the existing pipe
And the pipe cleaning device to perform the pipe cleaning operation.
Away from the control step installed in the pipe cleaning device
During pipe cleaning operation that is transmitted to a centralized control device installed at a remote location
High pressure and low pressure during pipe cleaning operation based on
Power, discharge temperature, superheat of compressor suction, flow into existing pipe
Whether the dryness of the refrigerant is set to an appropriate target value.
And a step of judging the suitability of the pipe cleaning operation.
is there.

Further, according to the suitability judgment of the pipe cleaning operation,
Change the operation control conditions or the refrigerant amount adjustment.
It is equipped with a table.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a refrigerant circuit diagram of a pipe cleaning device according to a first embodiment. In the figure, 1 is a compressor, 2 is an oil separator, 3 is a condenser, 4 and 6 are existing pipes that connect the heat source unit of the refrigerating and air-conditioning system and the indoor unit, pipes to be cleaned 5 are existing pipes 4, A bypass pipe connecting one end of 6, an electronic expansion valve 7, an evaporator 8, a device 9 for separating and collecting objects to be cleaned, and an accumulator 10. Reference numeral 11 is a pipe cleaning device, and a pipe cleaning device 1
1 is a compressor 1, an oil separator 2, a condenser 3, an electronic expansion valve 7,
The evaporator 8, the separation / collection device 9, and the accumulator 10 are sequentially connected to each other, and the bypass pipes 5 of the existing pipes 4 and 6 are connected to the other ends of the pipes 6 and 6 not connected to each other via connection valves 12a and 12b. The compressor 1 is a compressor whose rotation speed is variable, and the flow rate of the refrigerant to be conveyed can be increased / decreased by changing the rotation speed, and the condenser 3 and the evaporator 8 are pipe cleaning blown by a fan (not shown). Heat exchange is performed with the outside air around the device 11. 13a is a temperature sensor for measuring the discharge temperature of the compressor 1, 13b is a temperature sensor for measuring the temperature of the outlet of the condenser 3 and the inlet of the pipe to be cleaned 4, 13c is a temperature sensor for measuring the suction temperature of the compressor 1. , 14a is a pressure sensor for measuring the high pressure of the pipe cleaning device, and 14b is a pressure sensor for measuring the low pressure of the pipe cleaning device. 15 is a temperature sensor 13a, 13b, 13c, pressure sensor 14a, 14
From the measured value of b, the rotation speed of the compressor 1, the condenser 3, the evaporator 8
Is a measurement control device for controlling the fan air flow rate and the opening degree of the electronic expansion valve 7.

In the present invention, the refrigeration cycle is configured as shown in FIG. 1, and R407C which is an HFC mixed refrigerant is used as the refrigerant circulating in the refrigeration cycle.
R407C has 23 / R32 / R125 / R134a
It is a non-azeotropic mixed refrigerant mixed in a ratio of 25/52 wt%, and as refrigerating machine oil, ester oil compatible with this refrigerant is used. A refrigerating and air-conditioning system using an HCFC refrigerant is connected to the existing pipes 4 and 6 in the past, and mineral oil, which is a refrigerating machine oil for the HCFC refrigerant, remains in this existing pipe. Solubility of mineral oil in R407C is 1%
Below, it is almost insoluble in mineral oil.

Next, the cleaning procedure of the present invention will be described.
A heat source unit that needs to be replaced and is connected to the existing pipes 4 and 6.
The indoor unit is removed, and the pipe cleaning device 11 and the bypass pipe 5 are connected to the existing pipes 4 and 6 as shown in FIG. After connection, the entire refrigeration cycle is evacuated and then R407C is filled in an appropriate amount. Then, the compressor 1 is operated. The operation status of the refrigeration cycle at this time is as follows. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 first passes through the oil separator 2. At this stage, the refrigerating machine oil discharged from the compressor 1 together with the gas refrigerant is separated by the oil separator 2 and returned to the suction side of the compressor 1. The high-temperature high-pressure gas refrigerant is then partially cooled by the condenser 3 to become a liquid, and becomes a high-pressure gas-liquid two-phase refrigerant. This high-pressure gas-liquid two-phase refrigerant passes through the existing pipe 4, the bypass pipe 5, and the existing pipe 6 to wash the inside of these pipes, and then is decompressed to a low-pressure gas-liquid two-phase refrigerant by the electronic expansion valve 7. . After this, it is heated in the evaporator 8 to become a low-pressure gas. Next, it passes through the separation / recovery device 9, and at this time, the mineral oil that has been washed in the existing pipes 4 and 6 and peeled off from the adhesion inside the pipes is separated from the refrigerant, and the mineral oil is retained in the separation / recovery device 9. The low-pressure refrigerant gas is then sucked into the compressor 1 via the accumulator 10.

By operating the refrigeration cycle by the pipe cleaning device in this manner, it becomes possible to flow a gas-liquid two-phase mixed flow, that is, a refrigerant in which gas and liquid are mixed, in the existing pipe which is the pipe to be cleaned. Here, the reason why the gas-liquid two-phase refrigerant is caused to flow through the existing pipe for cleaning will be described. FIG. 2 is a diagram showing the cleaning characteristics according to the present invention by the residual amount of the mineral oil pipe and the cleaning time for each state of the refrigerant during cleaning, the horizontal axis represents the cleaning time, and the vertical axis represents the mineral oil remaining in the pipe after cleaning. It represents the quantity. When cleaning mineral oil as shown in Fig. 2, among the three states of gas single phase, liquid single phase, and gas-liquid two-phase (gas-liquid mixture), the gas-liquid two indicated by the one-dot chain line in the figure is indicated. It can be seen that the cleaning characteristics are excellent when the cleaning is performed in the phase.

In the conventional cleaning, a cleaning liquid such as HCFC225 is flowed as a liquid single phase into a pipe, and the cleaning liquid is dissolved by dissolving the mineral oil adhering to the pipe. Also, R40
When 7C is flowed for cleaning, if it is poured as a liquid in the pipe and washed as in the conventional case, the refrigerant and the mineral oil have almost no solubility. Therefore, the mineral oil is pulled by the shearing force with R407C and moved. Will be washed. in this case,
The moving speed of mineral oil is remarkably slow as compared with the flow speed of the refrigerant liquid, and it takes a long time to perform cleaning, which is not practical. In addition, R for piping
There is also a method of flowing 407C as a gas, but in this case as well, mineral oil is pulled by the shearing force with R407C and moved to be washed in the same manner, and the moving speed of the mineral oil is slow and it takes time to perform the washing. Not.

On the other hand, in the case of cleaning with a gas-liquid two-phase mixed flow, the two-phase flow causes the gas-liquid to mix and flow, so that the turbulence of the flow becomes larger than that in the case where a liquid single phase or a gas single phase flows. Therefore, the turbulence of the liquid refrigerant in the gas-liquid two-phase refrigerant becomes large near the wall surface of the pipe, and the mineral oil adhering to the wall surface is peeled off from the wall surface. Since the mineral oil peeled off from the wall surface moves in the refrigerant, the moving speed becomes the same as that of the refrigerant. Therefore R407
It becomes possible to move the refrigerant at a high speed as compared with the case where the refrigerant is pulled and moved by the shearing force with C to be washed, and the mineral oil is quickly washed in a short time.

As described above, the cleaning characteristics of the mineral oil removal by the gas-liquid two-phase refrigerant depend on the ability to move the mineral oil by the shearing force and the ability to peel the mineral oil from the pipe. Becomes larger, the cleaning capacity in pipe cleaning improves as the refrigerant flow rate increases. Therefore, when the flow rate of the refrigerant increases, it becomes possible to perform the cleaning in a short time, or to perform more sufficient cleaning even in the same cleaning time.

After the cleaning of the pipe is completed, the operation of the compressor 1 is stopped and the connection valve 12a is closed. Then, when the compressor 1 is operated again, the connection valve 12a is closed, so that the refrigerant discharged from the compressor 1 is driven into and accumulated in the condenser 3, while the existing pipes 4 and 6 and the bypass pipe 5 are stored. The refrigerant inside is drawn out to the accumulator 10 and the so-called pump down operation is performed, so that the R407C remaining in the existing pipes 4 and 6
Collect. Since the boiling point of R407C is as low as -43 ° C,
By performing this pump down operation, the gas is easily vaporized, so that R407C as a cleaning liquid can be easily recovered. Connection valve 12b after pump down operation
Is closed and the recovery of R407C is completed.

After the recovery of R407C, the pipe cleaning device 11 and the bypass pipe 5 are removed from the existing pipe, the heat source unit and the indoor unit which are newly installed after replacement are attached, and the cleaning of the existing pipe and the replacement of the refrigeration / air-conditioning system are completed. By doing so, it becomes possible to easily replace the refrigerating and air-conditioning device without re-installing the pipe.

Next, a method of operating the pipe cleaning device 11 during the cleaning operation will be described. As described above, in order to improve the cleaning ability, shorten the cleaning time, and realize more sufficient cleaning, it is necessary to perform an operation in which the cleaning flow rate of the refrigerant is large. Therefore, focusing on the operation characteristics of the compressor 1, as shown in FIG. 3, the flow rate of the refrigerant to be conveyed increases as the rotation speed of the compressor 1 increases and as the suction pressure of the compressor 1, that is, the low pressure increases. Therefore, in the cleaning operation, the compressor 1 is operated at a rotation speed as high as possible within a range that does not hinder the operation. By operating in this way, the flow rate of the transported refrigerant is increased, and the cleaning capacity can be improved. However, when the high pressure on the compressor discharge side may exceed the allowable design pressure of the pipe cleaning device 11 such as the compressor 1, or when the overload operation is performed and the operating load of the compressor 1 may exceed the allowable value. In some cases, the rotational speed is appropriately reduced to operate the compressor 1 to ensure the reliability of the operation of the compressor 1.

Even when the operating capacity is changed by changing the number of cylinders (number of cylinders) other than the method of changing the number of revolutions of the compressor, it is possible to perform as much as possible during the cleaning operation. The operating capacity of the compressor is largely controlled so that a large amount of refrigerant flows, and the high pressure causes the compressor 1 to operate.
When there is a risk that the allowable design pressure of the pipe cleaning device 11 will be exceeded, or when the operating load of the compressor 1 may exceed the allowable value due to overload operation, the operating capacity should be reduced appropriately. , Ensure reliability of operation of the compressor 1.

Further, in order to increase the washing flow rate, it is possible to control by controlling the low pressure side pressure of the refrigeration cycle, which is the suction pressure of the compressor, to be high. For example, a cleaning flow rate at which cleaning can be completed within the target cleaning time is set in advance,
When the rotation speed of the compressor 1 is determined, the target value of the low pressure for securing the flow rate required for cleaning can be determined from the correlation of FIG. Control of each device of the pipe cleaning device 11 is performed so as to realize this low pressure. For example, when the current low pressure during the cleaning operation is lower than the target value, the low pressure is increased by increasing the opening degree of the electronic expansion valve 7 or increasing the fan air volume of the evaporator 8. Further, the low pressure can be raised even if the fan air volume of the condenser 3 is reduced. In this case, the high pressure rises due to the decrease in the fan air volume, and the low pressure rises with the rise.

Although the target value of the low pressure is set, the low pressure value may exceed this value during operation. In this case, since the flow rate of the refrigerant carried by the compressor 1 is further increased, the cleaning ability is further improved and more sufficient cleaning is possible even with the same cleaning time. However, if the low pressure is operated too high, the flow rate of the refrigerant carried by the compressor 1 becomes too large, and the compressor 1 may be overloaded and the operating load may exceed the allowable value. In such a case, the upper limit of the low pressure is set, and the fan air volume of the condenser 3 is increased, the fan air volume of the evaporator 8 is decreased, and the electronic expansion valve 7 is controlled so as not to perform the operation at the low pressure or more. Control the opening small.

As a method of operating the pipe cleaning device 11 during the cleaning operation, a target value of the high pressure may be set in advance and the pipe cleaning device 11 may be operated so as to reach this target value. When the high pressure is high, the temperature of the two-phase refrigerant to be washed also rises,
Along with that, the temperature of the oil to be cleaned also rises. Since the viscosity of liquids such as oil decreases as the temperature rises, when the mineral oil is moved by the shearing force, the mineral oil easily moves and the cleaning ability is improved. Therefore, the temperature at which the required cleaning capacity is obtained is set in advance, and the pressure at which the temperature can be achieved is set as the target value of the high pressure. This temperature is 30 when considering the cleaning ability.
It is desirable to set the temperature above ℃. The pipe cleaning device 11 is operated so as to reach the target value of this high pressure. For example, when the current high pressure during the cleaning operation is lower than the target value, the high pressure is increased by decreasing the fan air flow rate of the condenser 3. In addition, the opening of the electronic expansion valve 7 can be increased and the evaporator 8
The fan air volume may be increased. By doing so, the low pressure rises, and the high pressure can rise with the rise.

Although the target value of the high pressure is set, the high pressure value may exceed this value during operation. In this case, since the viscosity of the oil is further reduced, the cleaning ability can be further improved. However, if the high pressure is operated too high, there is a possibility that the allowable design pressure of the pipe cleaning device 11 such as the compressor 1 may be exceeded. In such a case, the upper limit of the high pressure is set, and the fan air flow rates of the condenser 3 and the evaporator 8 and the opening degree of the electronic expansion valve 7 are controlled so that the operation at the high pressure or higher is not performed.

Further, when the lengths of the pipes to be cleaned 4 and 6 are long, the pressure loss of the pipes becomes large. Therefore, unless the high pressure is raised to a certain extent, the low pressure is reduced due to the pressure loss of the pipes, and the compressor is reduced. In some cases, the flow rate of the refrigerant conveyed in 1 may be lower than the flow rate required for cleaning. In order to cope with such a situation, the high pressure is operated so as to be higher than a certain value so that the low pressure does not decrease more than necessary. The control method for increasing the high pressure in this case can be carried out by the same method as described above.

As an operating method of the pipe cleaning apparatus 11 during the cleaning operation, the upper limit of the discharge temperature of the compressor 1 may be set in advance. When the operation for raising the high pressure is performed as described above, the discharge temperature is likely to rise accordingly. At this time, if the discharge temperature rises to a temperature that causes deterioration of the oil in the compressor 1, the operating reliability of the compressor 1 is reduced, which is not preferable. In order to avoid such a state, when the discharge temperature during operation may exceed the upper limit of the discharge temperature, the discharge temperature is lowered. In order to lower the discharge temperature, it is effective to lower the high pressure or lower the suction temperature of the compressor 1. Therefore, the fan air volume of the condenser 3 is increased to lower the high pressure, or the evaporator 8 is used. By decreasing the fan air flow rate or increasing the opening degree of the electronic expansion valve 7, the refrigerant superheat degree at the outlet of the evaporator 8 and the suction temperature are decreased, thereby decreasing the discharge temperature.

As a method of operating the pipe cleaning device 11 during the cleaning operation, the range of the refrigerant superheat on the suction side of the compressor 1 may be set. When the control for increasing the low pressure and the high pressure of the refrigeration cycle as described above is performed, depending on the control of each device, the refrigerant sucked in the compressor 1 does not become the superheated gas state, and the liquid returns to the compressor, or the compression is performed. The refrigerant superheat degree of the suction of the machine 1 becomes too large, and the suction temperature rises, which may cause the discharge temperature to rise. The liquid return to the compressor 1 and the rise of the discharge temperature reduce the reliability of the operation of the compressor 1. Therefore, in order to ensure the reliability of the operation of the compressor 1, the refrigerant superheat degree of the intake of the compressor 1 is An appropriate range is set, for example, a superheat degree of 5 ° C. to 10 ° C., and the refrigerant superheat degree is controlled within this range. The degree of superheat of the refrigerant can be controlled directly by controlling the opening degree of the electronic expansion valve 7, but may be indirectly controlled by controlling the fan air flow rates of the condenser 3 and the evaporator 8. That is, when the degree of refrigerant superheat is high, the degree of superheat is lowered by increasing the opening degree of the electronic expansion valve 7. However, as another method, the fan air volume of the evaporator 8 is reduced, so that The amount of heat exchange may be reduced to reduce the degree of superheat, the fan air flow rate of the condenser 3 may be reduced, the high pressure may be increased, and the low pressure may be increased accordingly. May be brought close to each other to reduce the amount of heat exchange in the evaporator 8 and reduce the degree of superheat. On the contrary, when the refrigerant superheat degree is low, the superheat degree is controlled to be high by performing the operation opposite to these operations.

Further, the pipe cleaning apparatus 1 during the cleaning operation
As the first operating method, the refrigerant state flowing into the pipe to be cleaned 4 may be used as a gas-liquid two-phase refrigerant, and the dryness of the gas-liquid two-phase refrigerant may be controlled to fall within a predetermined range. Pipe to be cleaned 4
As described above, the cleaning ability is improved when the state of the refrigerant flowing into is a gas-liquid two-phase refrigerant. Even if it is a gas-liquid two-phase refrigerant, if its dryness is close to 1,
The droplets are atomized in the gas flow and become almost the same as the gas single phase. When the dryness is close to 0, bubbles are flowing in the liquid flow. There is also a case where it becomes a bubbly flow and becomes almost the same flow as the liquid single phase, and it is difficult to obtain the effect of improving the cleaning ability by the gas-liquid two-phase flow. Therefore, even with the same gas-liquid two-phase refrigerant, considering the cleaning ability, a gas-liquid two-phase flow that is not in the vicinity of dryness 1 and dryness 0, that is, the dryness is about 0.2 to 0.9. It is desirable to set. The following control is carried out to control the state of the refrigerant flowing into the pipe to be cleaned 4 as a gas-liquid two-phase refrigerant and to control the dryness of the two-phase refrigerant within a predetermined range.

First, regarding the method of detecting the dryness of the gas-liquid two-phase refrigerant, the high pressure and the outlet temperature of the condenser 3 are measured. When R407C is used as the cleaning refrigerant, due to its non-azeotropic property, the pressure, temperature, and dryness have a correlation as shown in FIG. FIG. 4 is a diagram showing the relationship between the dryness of the refrigerant and the temperature when the pressure is constant. The horizontal axis represents the dryness of the refrigerant and the vertical axis represents the temperature of the refrigerant. It can be seen from FIG. 4 that the temperature of the refrigerant increases in proportion to the increase in dryness. Therefore, the dryness can be obtained by detecting the pressure and the temperature. This control method is used when the dryness is lower than the target dryness, for example, lower than 0.2. In this case, however, the amount of condensation in the condenser 3 is too large, and the fan air volume of the condenser 3 is reduced. The dryness is controlled to be high by reducing the amount of condensation. Further, the opening degree of the electronic expansion valve 7 may be increased or the fan air volume of the evaporator 8 may be decreased. By doing this, the degree of superheat in the evaporator 8 is reduced,
The area where the gas refrigerant exists in the evaporator 8 decreases, and the area where the separated refrigerant exists increases. Therefore, the amount of the refrigerant existing in the evaporator 8 increases, so that the increased amount of the refrigerant moves from the condenser 3 to the evaporator 8. Therefore, the amount of the refrigerant in the condenser 3 is reduced, and as a result, the dryness of the refrigerant at the outlet of the condenser 3 is controlled to be higher. When the dryness is higher than the target dryness, the dryness is controlled to be low by performing the reverse operation of these operations.

The method of controlling the heat exchange amount of the condenser 3 and the evaporator 8 described above is performed by increasing / decreasing the fan air volume. At this time, one method for reducing the fan air volume is as follows.
You may stop the fan itself. Further, instead of increasing / decreasing the heat exchange amount in the condenser 3 and the evaporator 8 by increasing / decreasing the fan air volume, the condenser 3 or the evaporator 8 is branched into a plurality of heat exchangers as shown in FIG. In such a configuration, the heat exchange amount may be changed by closing the branched portion with a valve 16 such as a solenoid valve or by increasing or decreasing the flow rate of the flow. In this case, by controlling the opening of the valve 16 in the closing direction, a part of the branch is closed, or the flow rate is reduced to reduce the heat exchange amount, and conversely, the opening of the valve 16 is controlled in the opening direction. It is also possible to reduce or eliminate the branch portion to be closed, or to increase the heat exchange amount without reducing the flow rate of the branch portion.

Further, as shown in FIG. 6, the condenser 3 or the evaporator 8 may be provided with a bypass pipe 17 for bypassing these heat exchangers. This bypass pipe 17 is also provided with a valve 16 such as a solenoid valve that can be closed or the flow rate can be adjusted.
The flow rate of the bypass pipe 17 is increased by controlling the opening degree of the valve 1 in the opening direction to increase the heat exchange amount.
By controlling the opening degree of 6 in the closing direction, the flow rate of the bypass pipe 17 is reduced or the bypass pipe 17 is closed. By performing such control, it is possible to control the heat exchange amounts of the condenser 3 and the evaporator 8 as in the case of increasing or decreasing the fan air flow.

When the temperature of the outside air around the pipe cleaning device 11 is low, the amount of heat exchange due to heat dissipation to the outside air in the condenser 3 becomes too large even if the fan is stopped, and control for reducing the amount of heat exchange is performed. It also occurs when it cannot be fully implemented. In this case, the condenser 3 or the entire pipe cleaning device 11 may be provided with a cover or the like for disconnecting it from the outside air. FIG. 7 is a diagram showing a configuration of a condenser in the pipe cleaning device, and FIGS. 8, 9 and 10 are diagrams showing a method of installing a cover in the pipe cleaning device. For example, as shown in FIG. 7, the condenser 3 has a pipe cleaning device 1
1, the outside air is installed in the inside of the device 1
When the structure is such that the air flows in from the outside and is ventilated to the outside air outlet 19 on the upper surface of the outer shell as shown in the figure, the outside air inlet 18 and the outside air outlet 19 are covered with the outside air as shown in FIG. 20 is provided. Alternatively, as shown in FIG. 9, a cover 20 is provided on the entire pipe cleaning device 11. By doing so, it is possible to reduce the heat radiation amount in the condenser 3 when the outside air temperature is low, and it is possible to appropriately control the heat exchange amount in the condenser 3. It should be noted that these covers 20 may be provided with an air passage 21 through which the outside air passes, as shown in FIG. 10, in order to secure an air passage for the outside air when the fan is operated. By thus providing the air passage 21 through which the outside air passes, even if the cover 20 is installed, the heat exchange amount can be controlled by increasing or decreasing the fan air amount. It should be noted that the same effect can be obtained even if the cover 20 is installed not only in all of the portions shown in FIGS. 8 and 9 but also in a part thereof.

When the outside air temperature around the pipe cleaning device 11 is low and the amount of heat exchange in the condenser 3 becomes too large even if the fan is stopped, another countermeasure is provided on the upstream side of the refrigerant circuit of the condenser 3. Alternatively, a heating device such as a heater for heating the downstream side or the suctioned outside air may be installed. When the amount of heat radiation becomes too large, the effect of the amount of heat radiation acting on the refrigerant can be reduced by heating the refrigerant or the intake air with a heating device, and the amount of heat exchange in the condenser 3 can be adjusted appropriately. It becomes possible to control. In addition, condenser 3
Alternatively, although the evaporator 8 is configured to exchange heat with the outside air, it may be configured to exchange heat with another medium such as water heat exchange. In this case, by controlling the amount of the medium such as the amount of water supplied to the heat exchanger, the same control as in the case of controlling the fan air flow can be performed.

Further, when the pipes 4 and 6 to be cleaned are long, the pressure loss in the pipes becomes large, so the method of controlling the opening of the electronic expansion valve 7 to a large extent so as not to lower the low pressure has been described. Depending on the configuration of the expansion valve 7, even if the opening degree is set to the maximum opening degree, a pressure difference may occur in the electronic expansion valve 7 to some extent, and it may not be possible to prevent the low-pressure pressure from decreasing. In such a case, as shown in FIG. 11, the bypass pipe 17 and the bypass pipe 17 are provided in parallel with the electronic expansion valve 7.
If a valve 16 such as a solenoid valve is provided above and the pressure difference in the electronic expansion valve 7 is desired to be reduced, the valve 16 is opened to allow the refrigerant to flow through the bypass pipe 17, so that the electronic expansion valve 7
The pressure difference at may be reduced. By doing so, even if the pipes 4, 6 to be cleaned are long and the pressure loss in the pipes is large,
It is possible to prevent the low pressure from decreasing and to secure the flow rate of the refrigerant required for cleaning.

In the control method described so far, the compressor 1,
By controlling the fan air volume of the condenser 3 and the evaporator 8 and the opening degree of the electronic expansion valve 7, the high pressure, the low pressure of the pipe cleaning device 11, the discharge temperature, the superheat degree of the compressor suction, and the flow into the pipe 4 to be cleaned. Although the method of controlling the dryness of the refrigerant is described, these state quantities may be controlled by adjusting the refrigerant quantity filled in the pipe cleaning device 11. When the refrigerant charge amount is increased, the high pressure during operation of the pipe cleaning device 11 is high, the low pressure is high, the discharge temperature is low, the superheat of the compressor suction is low, and the dryness of the refrigerant flowing into the pipe to be cleaned 4 is low. Since it changes, the amount of the filled refrigerant is adjusted so that the preset target values of the high pressure, the low pressure, the discharge temperature, the superheat degree of the suction of the compressor, and the dryness degree of the refrigerant flowing into the pipe 4 to be cleaned can be realized. As for this filling amount, the amount of refrigerant obtained by a predetermined calculation formula based on information such as the installation state of the pipes 4 and 6 to be cleaned and the outside air temperature may be filled. The amount of refrigerant to be charged may be increased or decreased based on the deviation from each target value.

When the flow resistance in the pipes 4, 6 to be cleaned is large, for example, when the pipes 4, 6 to be cleaned are long or the pipe diameter is small, the control target value in the cleaning operation of the pipe cleaning device 11 is set. It may be changed according to the flow resistance of the pipe to be cleaned. For example, when the flow resistance in the pipes 4 and 6 to be cleaned is large and the low pressure does not rise and the flow rate required for cleaning cannot be secured, the low pressure is increased by correcting the target value of the high pressure to be high. , Ensure the flow rate of the refrigerant required for cleaning. Alternatively, when the gas-liquid two-phase flow flows, the flow resistance in the pipes 4, 6 to be cleaned increases as the proportion of the gas increases, that is, as the dryness increases, so that the flow resistance in the pipes to be cleaned is reduced. The target value of the dryness of the refrigerant flowing into Nos. 4 and 6 is corrected to be low. By doing this, the pipes to be cleaned 4, 6
It reduces the flow resistance in the process and raises the low pressure to secure the flow rate required for cleaning. Regarding the flow resistance in the pipes 4 and 6 to be cleaned, information about the form of the pipes 4 and 6 to be cleaned is input to the measurement control device 15 in advance before the cleaning operation, and the flow resistance is calculated from the input value. The target value for operation may be changed based on the judgment, or if the low pressure does not rise from the operating state during the cleaning operation, it is judged that the flow resistance is large and the target value for the operation is changed. May be.

In the above operation of the pipe cleaning apparatus 11, the case where the indoor unit attached to one end of the pipes 4 and 6 to be cleaned was detached for cleaning was explained. However, as shown in FIG. Even if the cleaning is performed with the attached, the operation with the improved cleaning ability can be performed by performing the same operation control. FIG. 12 is a refrigerant circuit diagram showing another embodiment of the pipe cleaning device, in which 22 is an indoor unit, 2
3 is a use side heat exchanger, 24 is an electronic expansion valve, and the same parts as those in FIG. As for this indoor unit 22, the indoor unit 22 connected before the pipe cleaning may be cleaned at the same time as the pipes 4 and 6 to be cleaned, and may be continuously used even after the heat source device is replaced, or the heat source device is replaced. At the same time, the indoor unit 22 may be replaced with a new one, and the cleaning operation may be performed while the new indoor unit 22 is connected.

As described above, in the operation control of the pipe cleaning device 11, the refrigerant flow rate required for cleaning is secured, the temperature of the refrigerant flowing into the pipe to be cleaned 4 is increased, and the refrigerant flows into the pipe to be cleaned 4. By making the refrigerant state a gas-liquid two-phase flow with a dryness within a certain defined range, operation with improved cleaning capability is realized, and at the same time, high pressure, discharge temperature of the compressor 1, suction dry of the compressor 1 By controlling the temperature so as not to cause a problem in the operation of the pipe cleaning device 11, it becomes possible to enhance the reliability of the operation of the pipe cleaning device 11.

R407 is used as the cleaning refrigerant for cleaning the piping.
Not limited to C, other HFC-based single or mixed refrigerants may be used, such as R32 (slightly flammable / non-toxic) and R12.
5 (nonflammable / nontoxic), R134a (nonflammable / nontoxic), R
Cleaning may be performed with 410A (nonflammable / nontoxic) and R404A (nonflammable / nontoxic). Further, an HC type refrigerant such as propane, butane, or isobutane and a mixed refrigerant thereof, or a natural refrigerant such as ammonia or carbon dioxide may be used.

Embodiment 2. Embodiment 2 of the present invention will be described below with reference to the drawings. FIG. 13 is a refrigerant circuit diagram of the pipe cleaning device in the second embodiment. In the figure, reference numeral 25 is a high / low pressure heat exchanger, the same parts as those in FIG. 1 of the other embodiment 1 are designated by the same reference numerals, and the description thereof will be omitted. In the high / low pressure heat exchanger 25, heat is exchanged between the high pressure refrigerant partially cooled in the condenser 3 and the low pressure refrigerant flowing out from the electronic expansion valve 7. FIG. 14 is a circuit configuration diagram of the high and low pressure heat exchanger 25. In the figure, 26 is a double pipe, in which the high pressure refrigerant flows in the outer pipe and the low pressure refrigerant faces in the inner pipe. It has a flowing structure. Reference numeral 17 is a bypass pipe in the low-pressure side refrigerant flow, 16 is a valve such as a solenoid valve that adjusts the flow rate of the refrigerant flowing through the bypass pipe 17, and by opening and closing the valve 16 to adjust the flow rate of the refrigerant passing through the bypass pipe 17, The amount of heat exchange in the low pressure heat exchanger 25 can be controlled.

The operation status of this pipe cleaning device is shown in P of FIG.
A description will be given based on the H diagram. In the figure, the horizontal axis shows the enthalpy H and the vertical axis shows the pressure. The high-temperature and high-pressure gas refrigerant (A) discharged from the compressor 1 shown in FIG. 13 first passes through the oil separator 2. At this stage, the refrigerating machine oil discharged from the compressor 1 together with the gas refrigerant is separated by the oil separator 2 and the compressor 1
Returned to the suction side. The high-temperature and high-pressure gas refrigerant is then cooled by the condenser 3 by the amount of the input of the compressor and becomes a gas whose temperature has dropped (B). Thereafter, this high-pressure gas refrigerant is further partially cooled by the high-and-low-pressure heat exchanger 25 (C), and then passes through the existing pipe 4, the bypass pipe 5, and the existing pipe 6, and then the low-pressure gas-liquid liquid is applied by the electronic expansion valve 7. The pressure is reduced to two-phase refrigerant (D). After this, it is heated in the high and low pressure heat exchanger 25 to become a low pressure gas (E). At this time, since the heat exchange amount on the high pressure side and the heat exchange amount on the low pressure side are the same, the enthalpy difference between BC and the enthalpy difference between DE are the same value. Next, it passes through the separation and recovery device 9, and at this time, the mineral oil washed in the existing pipes 4 and 6 is separated, and the mineral oil is held in the separation and recovery device 9.
The low-pressure refrigerant gas is then sucked into the compressor 1 via the accumulator 10. When the high-and-low pressure heat exchanger 25 is provided instead of the evaporator 8 as described above, the evaporator 8 needs to exchange heat with the outside air as shown in the first embodiment, and therefore, the heat transfer efficiency on the air side. The heat exchanger size of the evaporator 8 has increased, but in the case of the high and low pressure heat exchanger 25, since heat exchange is performed between the refrigerants, the heat transfer efficiency is good,
The size of the high / low pressure heat exchanger 25 is reduced, and the pipe cleaning device 11 can be made compact.

Next, the operation control of the pipe cleaning device 11 will be described. By controlling the fan air flow rates of the compressor 1 and the condenser 3, the opening degree of the electronic expansion valve 7, and adjusting the refrigerant charging amount, the high pressure, the low pressure, the discharge temperature of the pipe cleaning device 11, the superheat degree of the compressor suction side, Since the method of controlling the dryness of the refrigerant flowing into the pipe to be cleaned 4 is the same as that in the first embodiment, the description thereof will be omitted. Next, regarding the method of controlling the heat exchange amount of the high / low pressure heat exchanger 25, when the heat exchange amount of the high / low pressure heat exchanger 25 is increased, the heat exchange capacity for condensing the high pressure refrigerant and the heat exchange capacity for evaporating the low pressure refrigerant. Will increase together. 16. Here, FIG. 16 is a PH diagram showing the operating state when the heat exchange amount of the high and low pressure heat exchanger of the pipe cleaning device changes, the enthalpy H is plotted on the horizontal axis and the pressure P is plotted on the vertical axis, and the solid line shows the large heat exchange amount. , The dotted line shows a small amount of heat exchange. Therefore, as shown by the solid line in FIG. 16, in the operating state of the pipe cleaning device 11, the high-pressure side decreases, the low-pressure side increases, and the dryness of the refrigerant at the high-pressure side outlet of the high-low pressure heat exchanger 25 serving as a condenser, that is, The dryness of the refrigerant flowing into the cleaning pipe 4 becomes low, and the superheat degree of the refrigerant at the low-pressure side outlet becomes high. As the refrigerant superheat degree at the low-pressure side outlet of the high-low pressure heat exchanger 25 increases, the suction superheat degree of the compressor 1 also increases, which increases the discharge temperature of the compressor 1.

When the discharge temperature of the compressor, the superheat degree of the suction of the compressor 1 and the dryness of the refrigerant flowing into the pipe to be cleaned 4 are controlled to the target values, the control characteristics of the high and low pressure heat exchanger 25 are set as follows. Control the amount of heat exchange. On the other hand, it is a case where high pressure and low pressure are controlled, but the low pressure is low and the flow rate of the refrigerant required for cleaning cannot be secured. Two
The heat exchange amount of 5 is controlled to be small. When the control is performed in this manner, the high pressure is high and the low pressure is low. At this time, since the differential pressure between the pipe to be cleaned 4 and the electronic expansion valve 7 becomes large,
When the flow resistance of the pipe to be cleaned 4 to the electronic expansion valve 7 does not change, it becomes possible to flow a larger amount of refrigerant. Therefore, the low pressure rises so that the flow rate of the refrigerant corresponds to the increase in the pressure difference, and the flow rate of the refrigerant carried by the compressor 1 is increased. Therefore, if the heat exchange amount of the high / low pressure heat exchanger 25 is controlled to be small, as a result, the high pressure is increased and the low pressure is also increased, and the operation for increasing the refrigerant flow rate can be performed.
On the contrary, when it is desired to reduce the flow rate of the refrigerant by reducing both the high pressure and the low pressure in the overload operation state, conversely, the heat exchange amount of the high and low pressure heat exchanger 25 is largely controlled.

There is an optimum range for the heat exchange amount of the high and low pressure heat exchanger 25. To increase the refrigerant flow rate,
As described above, the heat exchange amount increases as the heat exchange amount decreases, but if the heat exchange amount is too small, the refrigerant superheat degree at the intake of the compressor 1 becomes 0, liquid back to the compressor 1 occurs, and the reliability of the compressor 1 increases. Not preferable. Further, when the operation is such that the liquid refrigerant returns to the compressor 1 in this way, the operation is such that the liquid refrigerant accumulates in the accumulator 10 on the suction side of the compressor 1. At this time, the amount of refrigerant existing in other refrigeration cycles such as the pipes 4 and 6 to be cleaned decreases, so that in the pipes 4 and 6 to be cleaned, the amount of gas in the gas-liquid two-phase flow increases, that is, the dryness increases. As a result, the flow resistance in the cleaned pipes 4 and 6 increases. If the pipes 4 and 6 to be cleaned have long pipe lengths and the flow resistance is originally large, and the flow resistance is further increased, the low pressure will drop, and as a result the refrigerant flow rate required for cleaning will be secured. It will be impossible to drive. Further, if the heat exchange amount of the high / low pressure heat exchanger 25 is increased, the flow rate of the refrigerant is reduced and the cleaning performance is lowered, which is not preferable, but at the same time, if the heat exchange amount is increased to increase the intake superheat degree, the compressor 1 If the discharge temperature is too high and becomes too high, it is not preferable in terms of reliability of the compressor.

From the above, as the design capacity of the heat exchange amount of the high and low pressure heat exchanger 25, the resulting superheat of suction of the compressor 1 is in a predetermined appropriate range, for example, the superheat of suction of the compressor 1 is 0 ° C. It is desirable to set it in a range that is larger than 20 ° C., and also when controlling the heat exchange amount of the high and low pressure heat exchanger 25, similarly, the suction superheat degree of the compressor 1 is in a predetermined appropriate range. It is desirable to be controlled to.

The heat exchange amount of the high / low pressure heat exchanger 25 may be changed according to the outside air temperature. When the outside air temperature is low in the operation of the pipe cleaning device 11, the operation status is as shown in FIG. Figure 17 shows outside temperature 40
It is the figure which showed the operating condition of the pipe washing | cleaning apparatus in 20 degreeC, -20 degreeC, and the horizontal axis shows enthalpy H and a vertical axis shows pressure. When the outside air temperature is −5 ° C. (solid line in the figure), heat radiation from the pipes 4, 6 to be cleaned and the pipe cleaning device 11 becomes large, so that the outlet enthalpy (D) of the pipe to be cleaned 6 and the suction of the compressor 1 are not absorbed. Enthalpy (E) tends to be small.
As a result, the operation is such that the superheat degree of the suction of the compressor 1 is reduced. When the outside air temperature is lower, or when the pipe lengths of the pipes 4 and 6 to be cleaned are long and the amount of heat radiation tends to be large, the superheat degree of the suction of the compressor 1 is further reduced, and the liquid back to the compressor 1 is reduced. The operation is such that the refrigerant is generated or the refrigerant is accumulated in the accumulator 10 and the refrigerant flow rate is reduced. Therefore, in order to avoid such a situation, when the outside air temperature is low, control is performed in advance so that the heat exchange amount of the high / low pressure heat exchanger 25 becomes large. By performing the control in this manner, it is possible to realize an operation in which the superheat degree of the suction of the compressor is appropriately ensured, the reliability of the compressor 1 can be ensured, and the refrigerant flow rate required for cleaning can be ensured.

On the other hand, in the operation of the pipe cleaning device 11 when the outside air temperature is high, the operating conditions are as shown in FIG.
As shown in the case of ℃ (dashed line in the figure), since the heat absorption amount from the outside air in the pipes 4, 6 and the pipe cleaning device 11 becomes large, the outlet enthalpy (D) of the pipe 6 and The enthalpy (E) of the compressor 1 suction tends to be large. As a result, the operation is such that the superheat degree of the suction of the compressor 1 becomes large. In this case, if the discharge temperature rises and the outside air temperature is high and the discharge temperature is too high, the reliability of the compressor 1 is not preferable. Therefore, in order to avoid such a situation, when the outside air temperature is high, control is performed in advance so that the heat exchange amount of the high / low pressure heat exchanger 25 becomes small. When the control is performed in this manner, an operation in which the superheat degree of the suction of the compressor is lowered can be realized, and the reliability of the compressor can be secured.

As described above, by appropriately controlling the heat exchange amount of the high and low pressure heat exchanger 25, the reliability of the operation of the compressor 1 is ensured, and the operation in which the refrigerant flow rate required for cleaning is ensured is realized. can do.

In the first embodiment, the high and low pressure heat exchanger 25 is described as a double pipe, but the same control is performed even if another heat exchanger such as a plate heat exchanger is used. By doing so, the same effect can be obtained. In addition, as a method of controlling the heat exchange amount, as shown in another circuit configuration diagram of the high and low pressure heat exchanger shown in FIG. 18, a plurality of heat exchangers are prepared, and the flow rate of the refrigerant flowing through a part thereof is reduced by the valve 16. Alternatively, the heat exchange amount may be controlled by closing the flow path.

Third Embodiment Hereinafter, a third embodiment of the present invention
Will be described with reference to the drawings. FIG. 19 is a refrigerant circuit diagram of the pipe cleaning apparatus according to the third embodiment. In FIG. 19, 2
Reference numeral 7 denotes a gas cooler, and the same parts as those of the other first and second embodiments are designated by the same reference numerals and the description thereof will be omitted. The gas cooler 27 exchanges heat with the outside air around the pipe cleaning device 11 blown by a fan.

FIG. 20 shows the operating condition of the pipe cleaning device 11.
This will be described based on the PH diagram of No. In the figure, the horizontal axis shows the enthalpy H and the vertical axis shows the pressure. The high temperature and high pressure gas refrigerant (A) discharged from the compressor 1 shown in FIG. 19 first passes through the oil separator 2. At this stage, the refrigerating machine oil discharged from the compressor 1 together with the gas refrigerant is separated by the oil separator 2 and returned to the suction side of the compressor 1. The discharged high-temperature and high-pressure gas refrigerant is then cooled by the high-low pressure heat exchanger 25 to become a gas-liquid two-phase refrigerant (B), which passes through the existing pipe 4, the bypass pipe 5, and the existing pipe 6 and then by the decompression device 7. The pressure is reduced to a low pressure gas-liquid two-phase refrigerant (C). After this, high and low pressure heat exchanger 2
It is heated at 5 and becomes a low-pressure gas (D). At this time, since the high pressure side refrigerant flowing into the high and low pressure heat exchanger 25 is in the discharge state of the compressor 1, it becomes higher in temperature than the outside air under most operating conditions and exchanges heat with the other refrigerant in the high and low pressure heat exchanger 25. Therefore, the temperature of the low-pressure gas also becomes higher than that of the outside air. At this time, since the heat exchange amount on the high pressure side and the heat exchange amount on the low pressure side are the same, the enthalpy difference between AB and the CD is the same value. Then, after this, the gas refrigerant is cooled by the outside air by the gas cooler 27 (E). Next, it passes through the separation and recovery device 9, and at this time, the mineral oil washed in the existing pipes 4 and 6 is separated, and the mineral oil is held in the separation and recovery device 9. The low-pressure refrigerant gas is then sucked into the compressor 1 via the accumulator 10. When the high / low pressure heat exchanger 25 is provided in place of the condenser 3 as described above, the condenser 3 needs to exchange heat with the outside air, so that the heat transfer efficiency on the air side is poor and the heat exchanger of the condenser 3 is used. Although the size has increased, in the case of the high / low pressure heat exchanger 25, heat exchange is performed between the refrigerants, so that the heat transfer efficiency is good, the size of the high / low pressure heat exchanger 25 is reduced, and the pipe cleaning device is It can be made compact.

Next, the operation control of the pipe cleaning device 11 will be described. The heat exchange amount of the compressor 1 and the high / low pressure heat exchanger 25,
By controlling the opening degree of the electronic expansion valve 7 and adjusting the refrigerant filling amount, the high pressure, the low pressure, the discharge temperature of the pipe cleaning device 11, the superheat of the compressor suction, and the dryness of the refrigerant flowing into the pipe 4 to be cleaned can be controlled. The method of controlling is the same as in the first and second embodiments, and thus the description thereof is omitted.

Next, regarding the method of controlling the gas cooler 27, when the gas cooler 27 is controlled, the following operating conditions are obtained. When the fan air volume of the gas cooler 27 is increased, the cooling amount is increased, so that the suction superheat degree of the compressor is reduced and the discharge temperature is accordingly reduced. When the discharge temperature decreases, the inlet gas temperature of the high / low pressure heat exchanger 25 also decreases. Here, looking at the high pressure side refrigerant state in the high and low pressure heat exchanger 25, it is cooled from the gas refrigerant to become a saturated gas refrigerant and remains as a gas during this time, and then is further cooled to partially condense the gas and liquid two-phase refrigerant. Become. Since the heat transfer efficiency of the gas-liquid two-phase refrigerant that causes condensation is about 3 to 5 times better than that of the gas single phase, the heat transfer efficiency of the high-low pressure heat exchanger 25 increases as the portion where the two-phase refrigerant exists increases. It improves and the amount of heat exchange increases. When the inlet gas temperature of the high / low pressure heat exchanger 25 decreases, the saturated gas refrigerant is likely to become, so that the proportion of the gas portion in the high / low pressure heat exchanger 25 decreases, and conversely the proportion of the gas-liquid two-phase portion increases. Therefore, the amount of heat exchange increases. Therefore, as described in the second embodiment, the operating state of the pipe cleaning device 11 is reduced to both high and low pressures, and the refrigerant flow rate is reduced.

FIG. 21 is a PH diagram showing a change in the operating condition of the gas cooler 27 due to the fan air volume control.
In the figure, the horizontal axis shows the enthalpy H and the vertical axis shows the pressure. The solid line shows the case where the gas cooler fan air flow is large, and the dotted line shows the case where the gas cooler fan air flow is small. As shown by the solid line in FIG. 21, when the fan air volume of the gas cooler 27 is increased,
Both the high pressure and the low pressure decrease, the discharge temperature and the suction temperature decrease, and the dryness of the refrigerant flowing into the pipe to be cleaned 4 decreases. Depending on such control characteristics, high pressure, low pressure, discharge temperature,
Fan control of the gas cooler is performed based on the deviation between the current value and the target value of the degree of superheat of the suction of the compressor 1 and the dryness of the refrigerant flowing into the pipe to be cleaned 4, and the high pressure, low pressure, and discharge temperature are controlled. The superheat degree of the suction of the compressor 1 and the dryness value of the refrigerant flowing into the pipe 4 to be cleaned are controlled to be appropriate values.

By thus controlling the operation of the pipe cleaning device 11, the flow rate of the refrigerant required for cleaning can be secured, the cleaning performance can be improved, and the pipe cleaning device can be operated with high reliability.

Fourth Embodiment 22 is a view showing a fourth embodiment of the present invention and is a refrigerant circuit diagram of a pipe cleaning device. In the figure, 28 is a heat source device, and the refrigerant circuit is composed of a compressor 1, an oil separator 2, a four-way valve 29, a heat source side heat exchanger 30, and an accumulator 10.
31 is a mineral oil recovery device, and the refrigerant circuit has a high / low pressure heat exchanger 25, an electronic expansion valve 7, a separation / recovery device 9, and a check valve 3.
2a, 32b, 32c, 32d. Again 12
Reference characters a and 12b are connection valves that connect the mineral oil recovery device 31 and the existing pipes 4 and 6, and reference characters 12c, 12d, 12e, and 12f are connection valves that connect the heat source device 28 and the mineral oil recovery device 31.

In the present embodiment, instead of the pipe cleaning device 11 shown in FIG. 13 or FIG. 19, the heat source device 28 and the mineral oil recovery device 31 installed after replacement are combined for cleaning. The refrigeration cycle configured in FIG. 22 has a four-way valve 2
When 9 is set to flow in the solid line direction, the refrigerant flows in the direction of the solid line arrow in the drawing, the circuit configuration is the same as that in FIG. 13, and the same effect as that of the above-described second embodiment is obtained. Can be similarly performed. Also four-way valve 2
9 is set to flow in the direction of the dotted line arrow, the heat source side heat exchanger 30 corresponding to the gas cooler 27 and the mineral oil recovery device 9
However, the circuit configuration is the same as that in FIG. 19, but the same effects as those of the above-described third embodiment are obtained, and the pipe cleaning can be performed in the same manner. After the cleaning is completed, the mineral oil recovery device 31 and the bypass pipe 5 are removed, and the heat source device 28 and the indoor unit are connected to the existing pipes 4 and 6, thereby completing the cleaning of the pipe and the replacement of the refrigeration / air-conditioning device.

Further, in FIG. 22, 15 is a measurement control device of the heat source unit 28, and 33 is a measurement control device of the mineral oil recovery device 31. The operation of each measurement control device in the operation control of the pipe cleaning operation is performed as follows. First, in the measurement control device 15 of the heat source device 28, the discharge temperature, the suction temperature, the high pressure, and the low pressure of the compressor 1 are detected by the temperature sensor 13.
a, 13c, the pressure sensors 14a, 14b are used to obtain measured values, and this information is used as the measurement control device 33 of the mineral oil recovery device 31.
To transmit. In the measurement control device 33 of the mineral oil recovery device 31, temperature information and heat source at the outlet of the high and low pressure heat exchanger 25 measured by the temperature sensor 13b provided at the condensation side outlet of the high and low pressure heat exchanger and provided at the inlet of the pipe to be cleaned. The control method of the compressor 1, the fan air volume of the heat source side heat exchanger 30, the heat exchange amount of the high / low pressure heat exchanger 25, and the opening degree of the electronic expansion valve 7 are determined in combination with the above information transmitted from the machine 28. Then, the operation control of the compressor 1 and the control method of the fan (not shown) of the heat source side heat exchanger 30 are instructed to the measurement control device 15 of the heat source device 28, and the heat of the high / low pressure heat exchanger 25 is controlled. Exchange amount, electronic expansion valve 7
Control the opening degree of. Measurement control device 1 of heat source unit 28
In step 5, the information from the mineral oil recovery device 31 is received, and the rotation speed of the compressor 1 and the rotation speed of the fan of the heat source side heat exchanger 30 are controlled. On the other hand, the operation control of the heat source device 28 as a normal refrigerating air-conditioning device after the mineral oil recovery device 31 is removed is
It is implemented by the measurement control device 15.

As described above, the operation control during the pipe cleaning operation is left to the measurement control device 33 of the mineral oil recovery device 31, and the measurement control device 15 of the heat source device 28 is used for the operation control of the heat source device 28 as a normal refrigerating and air-conditioning device. 22 by specializing
Even if it is a heat source machine that was not originally compatible with the pipe cleaning method configured as described in 1., the pipe cleaning operation can be performed without major control changes. The width can be widened and versatility can be improved.

As another form of the fourth embodiment, FIG.
You may take the form shown in. FIG. 23 is a diagram showing a refrigerant circuit diagram of the pipe cleaning device, in which 36 is an operation control device, and the same or corresponding parts as in FIG. 22 are designated by the same reference numerals. The refrigerant circuit is the same as that of FIG.
8 is different from the measurement control device 15 of 8 and the measurement control device 33 of the mineral oil recovery device 31 in that an operation control device 36, which is provided outside and is communicatively connected, is provided. The operation control device 36 is a portable mobile terminal such as a personal computer, and has a function capable of controlling the operation of the heat source device 28 and the mineral oil recovery device 31, and the measurement control device 15 of the heat source device 28 and the measurement control device 33 of the mineral oil recovery device 31 and information. With the function of transmitting. The operation control during the pipe cleaning operation is performed as follows. First, in the heat source side measurement control device 15 provided in the heat source device 28, as described above, the measured value of the operating state of the heat source device 15 side is obtained from each pressure sensor and temperature sensor, and this information is transmitted to the operation control device 36. To do. Further, in the cleaning side measurement control device 33 provided in the mineral oil recovery device 31, as described above, the high / low pressure heat exchanger 25 measured by the temperature sensor 13b.
The temperature measurement value at the outlet is obtained, and this information is supplied to the operation controller 36.
To transmit. The operation control device 36 obtains these operation information and outputs the control content for each actuator in the heat source device 28 such as the compressor 1 and the control content for each actuator in the mineral oil recovery device 31 such as the high and low pressure heat exchanger 25. Then, the measurement control devices 15 and 33 are instructed to perform the determined control.

In FIG. 23, the operation control device 36 and the heat source side measurement control device 15 of the heat source device 28, and the operation control device 36 and the washing side measurement control device 33 of the mineral oil recovery device 31 are directly connected to each other. Although information is transmitted mainly through 36, each control device is provided with a network function so that the operation control device 36 and the measurement control device 15 of the heat source device 28, the operation control device 36 and the mineral oil recovery device 31 are washed. Even if the side measurement control device 33 is indirectly connected, the operation control device 36 and the heat source side measurement control device 15 of the heat source device 28, and the operation control device 36 and the cleaning side measurement control device 33 of the mineral oil recovery device 31.
It may be in a form capable of transmitting information to and from. For example, the operation control device 36 and the heat source side measurement control device 15 of the heat source device 28 are connected, the heat source side measurement control device 15 and the cleaning side measurement control device 33 of the mineral oil recovery device 31 are connected, and each control device is The network control function is maintained, and the operation control device 36 and the cleaning-side measurement control device 33 of the mineral oil recovery device 31.
If the information can be transmitted, the operation control device 36 can acquire the operation information and instruct the operation control as described above.

Even in such a form, the operation control during the pipe cleaning operation is left to the operation control device 36, and the operation control part of the heat source device 28 as a normal refrigerating and air-conditioning device has the above-mentioned heat source device 28. By specializing the heat source side measurement control device 15, even if the heat source device originally does not support the pipe cleaning method as shown in FIG. The pipe cleaning operation can be performed without any change, the range of application of the heat source device when the pipe cleaning operation is performed can be widened, and the versatility can be enhanced.
Further, when the mineral oil recovery device 31 is connected to various types of heat source units and is used and the control method of the pipe cleaning operation needs to be changed according to the various heat source units 28, the operation control is performed when such a mode is adopted. This can be dealt with by changing the control contents for the heat source device 28 and the mineral oil recovery device 31 held by the device 36 according to the heat source device 28. For example, the operation control device 3
When 6 is a personal computer, the operation control can be easily changed by appropriately changing the control program executed during the pipe cleaning operation. Therefore, the cleaning side measurement control device 33 of the mineral oil recovery device 31 does not need to hold the operation control method during pipe cleaning, and the cleaning side measurement control device 3 of the mineral oil recovery device 31 is specialized by driving each actuator.
It is not necessary to change the operation control method of No. 3 according to the heat source device 28, and the pipe cleaning operation when the mineral oil recovery device 31 is used can be performed with greater versatility.

22 and 23, when the pipe cleaning operation is carried out, the heat source side measurement control device 15 of the heat source device 28 and the cleaning side measurement control device 33 of the mineral oil recovery device 31, or these. Information is transmitted between the operation control devices 36. If the transmission of this information fails due to the influence of noise or the like, the operation information of the heat source device 28 cannot be transmitted, or a command for controlling the actuator of the compressor 1 or the like of the heat source device 28 is not issued. As a result, the compressor 1 of the heat source device 28 may perform an abnormal operation, and the heat source device 28 may be damaged due to an excessive increase in pressure. Therefore, when an abnormality is found in the communication between each measurement control device and the operation control device such as the transmission of information, the compressor 1 of the heat source device 28 is quickly stopped to protect the heat source device 28. As a protection method, for example, when the heat source side measurement control device 31 of the heat source device 28 detects a communication abnormality such as not being able to obtain information from another control device or receiving a reception notification of the transmitted information. The heat source unit 28 is protected by stopping the operation of the compressor 1. Also, the heat source unit 2
8. If communication abnormality is found in at least one of the heat source side measurement control device 15 of No. 8, the washing side measurement control device 33 of the mineral oil recovery device 31, and the operation control device 36, communication abnormality is present in at least one of the control devices. The state is displayed to inform the supervisor who monitors the pipe cleaning operation, and the supervisor activates the manual stop function of the compressor 1 provided in the measurement control device 15 of the heat source device 28 in advance to operate the compressor 1 You may stop. Thus, the heat source side measurement control device 1 of the heat source device 28
5 and the cleaning side measurement control device 33 of the mineral oil recovery device 31 and the operation control device 36 are not successfully transmitted, the compressor 1 of the heat source device 28 is quickly stopped and the heat source device 2
By preventing the heat source unit 28 from being damaged due to the abnormal operation of No. 8, it becomes possible to carry out a more reliable pipe cleaning operation.

When the pipe cleaning operation is carried out in the form shown in FIGS. 22 and 23, the heat source side measurement control device 15 of the heat source device 28, the cleaning side measurement control device 33 of the mineral oil recovery device 31, and the operation control device. In at least one of 36, operating conditions during the pipe cleaning operation, for example, information on the refrigerant such as pressure and temperature measured during the operation, operating information of each actuator such as the operation of the compressor 1, the cleaning time until now and the future. The progress of the pipe cleaning operation such as the required cleaning time and the completion or non-completion of the pipe cleaning operation may be displayed on the display unit and recorded using the storage means. By displaying such a display, the operation status during the pipe cleaning operation can be confirmed, and the convenience of the pipe cleaning operation is enhanced.A person who monitors the pipe cleaning operation monitors this operation status and the pipe cleaning operation is performed normally. If it can be determined that the pipe cleaning operation has not been performed, try the pipe cleaning operation again, or correct the operation control of the pipe cleaning operation as appropriate.
The pipe cleaning operation can be reliably performed. In addition, since the progress status of the pipe cleaning operation is recorded, the cause of the operation stop becomes clear from the operation status record, such as when the operation stops due to some abnormality during the pipe cleaning operation.
By taking measures against that factor, it becomes possible to reliably perform the pipe cleaning operation. Further, when the pipe cleaning operation has stopped after progressing to some extent, the remaining pipe cleaning operation time may be derived from the record of the operation status, and the pipe cleaning operation after the restart may be performed for the remaining operation time. By performing such an operation, the pipe cleaning operation is performed for a necessary and sufficient time compared to when the pipe cleaning operation is performed from the beginning again, and the time of the pipe cleaning operation can be performed without performing unnecessary unnecessary pipe cleaning operation. Can be shortened.

22 and 23, the completion or incompletion of the pipe cleaning operation is recorded in the heat source side measurement control device 15 of the heat source unit 28, and the pipe cleaning operation is completed. If not, in the heat source device 28, operations other than the pipe cleaning operation such as normal operation may be prohibited. Heat source unit 2 to carry out pipe cleaning operation
8. Even if the mineral oil recovery device 31 is configured, the pipe cleaning operation is not performed or is not completed due to some reason such as human error, and the pipe cleaning operation is terminated, and the heat source unit 28 is used for normal refrigeration and air conditioning. There is a case where the device is operated, and in this case, since the pipe cleaning has not been completed, the operation of the refrigerating and air-conditioning device may be caused due to the inflow of the residual mineral oil in the existing pipe. Therefore, when the heat source unit 28 is used to perform an operation other than the pipe cleaning operation such as an operation as a normal refrigerating and air-conditioning apparatus, the completion of the pipe cleaning operation is always recorded in the heat source side measurement control device 15 of the heat source unit 28. Like By doing this, it is possible to ensure that the pipe cleaning operation has been completed when performing operations other than the pipe cleaning operation, such as the operation as a normal refrigeration / air-conditioning system, which is more reliable. A refrigeration air conditioner can be supplied.

Embodiment 5. 24 and 25 are diagrams showing the fifth embodiment of the present invention, and are diagrams showing a flow of information during a pipe cleaning operation and during a heat source device operation after the cleaning operation is completed. 24 and 25,
Reference numeral 34 denotes a centralized control device installed at a location remote from the refrigeration / air-conditioning system (for example, a service center of a refrigeration / air-conditioning system management company). The operation information in the measurement data is used as the measurement control devices 33 and 15 for the mineral oil recovery device 31 and the heat source device 28.
Receive from In FIG. 25, 13d and 13e are temperature sensors for detecting the refrigerant temperature in the use side heat exchanger 23, and 1
3 f is a temperature sensor for detecting the indoor air temperature in the use side heat exchanger 23, and 35 is a measurement control device for the indoor unit 22.
Note that the other reference numerals in FIGS. 24 and 25 denote the first to fourth embodiments.
The description is omitted because it is the same as.

The measurement controller of the indoor unit 22 in FIG. 25 measures the information of the set temperature set by the user of the refrigerating and air-conditioning system, the refrigerant temperature in the use side heat exchanger 23, and the indoor air temperature of the heat source unit 28. The superheat degree or subcooling degree of the utilization side heat exchanger 23 is calculated based on the information transmitted from the measurement control device 15 of the heat source device 28 while being transmitted to the control device 15, and the electronic result is calculated based on the calculation result. The opening degree of the expansion valve 24 is determined, and the heat exchange amount in the utilization side heat exchanger 23 is determined and controlled by the fan air flow rate or the like.

FIG. 26 is a diagram showing a service / maintenance work and a flow of information when the refrigerating and air-conditioning apparatus is replaced with a pipe cleaning. The flow of services and information is shown below in Figure 2.
6 will be described. First, the refrigeration / air-conditioning system user 40 sends the refrigeration / air-conditioning system management company 41 to the refrigeration / air-conditioning system 42.
To update (S1). Next, the refrigeration / air-conditioning system management company 41 investigates the conditions of the existing refrigeration / air-conditioning system and the existing piping (S2), and if it judges that the existing piping is clean and usable, the refrigeration / air-conditioning system manufacturer 43 installs the refrigeration / air-conditioning system. When an order is placed (S3) and the refrigerating and air-conditioning system is delivered (S4), the contractor 44 is requested to perform pipe cleaning work and refrigerating and air-conditioning system renewal work (S5). At this time, the mineral oil recovery device 31 shown in FIG.
With regard to the above, the refrigeration / air-conditioning equipment manufacturer 43 sells the refrigeration / air-conditioning equipment management company 41 to the refrigeration / air-conditioning equipment management company 41 (S6), and the refrigeration / air-conditioning equipment management company 41 instructs the construction company 44 to perform a pipe cleaning work using the mineral oil recovery device 31. The operation information of the heat source device 28 and the mineral oil recovery device 31 during the pipe cleaning operation is sent to the refrigeration / air-conditioning device manager 41 while the contractor 44 performs the refrigerating device installation work and the pipe cleaning (S7). 23 is transmitted to the central control device 34 shown in FIG. 23 by wire communication or wireless communication by telephone line or internet (S8), and by using the central control device 34, the heat source unit 28 during the pipe cleaning operation and the mineral oil recovery device which will be described later. 31 is managed (S9).

After cleaning the pipes, as shown in FIG. 25, the normal refrigerating and air-conditioning operation is performed using the heat source unit 28, and the operation information of the heat source unit 28 and the indoor unit 22 at this time is also managed by the refrigerating and air conditioning unit. They are collected in the centralized management device 34 under the contractor 41 (S8), and the centralized management device 34 is used to manage the heat source units 28 during normal operation (S8).
9). If there is any problem during the pipe cleaning operation or normal operation and construction is required, the refrigeration and air conditioning equipment management company 41
Orders maintenance parts from the refrigeration and air conditioning manufacturer 43 (S1
At the same time, the contractor 44 is requested to perform maintenance work (S11), and when the refrigeration and air conditioning system manufacturer 43 delivers maintenance parts (S12), the contractor 44 carries out maintenance work (S13).

In this embodiment, the heat source unit 28 during the pipe cleaning operation and after the pipe cleaning operation will be described with reference to FIGS. 24 and 25.
The operation management method will be described. First, the management method during the pipe cleaning operation will be described with reference to FIG. In this case, the central control device 34 installed remotely from the construction site
The operation information of the mineral oil recovery device 31 is received from the measurement control device 33 of the mineral oil recovery device 31, and the operation information of the heat source device 28 is received via the measurement control device 33 of the mineral oil recovery device 31. As the information received at this time, control information such as the inlet temperature of the pipe 4 to be cleaned, the heat exchange amount of the high and low pressure heat exchanger 25, the opening degree of the electronic expansion valve 7 and the like from the mineral oil recovery device 31.
From the heat source device 28, the discharge temperature of the compressor 1, the suction temperature, the high pressure and the low pressure during operation, the rotation speed of the compressor 1, the control information of the device such as the fan air volume of the heat source side heat exchanger 30, And receive information such as electrical input when operating the equipment.

Next, the central control unit 34 judges whether or not the pipe cleaning operation is properly performed based on the received information. When it is determined that the pipe cleaning operation is not properly performed, the mineral oil recovery device 3 should be operated appropriately.
The operation control instruction is given to the first measurement control device 33. For example, high pressure, low pressure, discharge temperature during pipe cleaning operation,
When an appropriate target value is not set for the degree of superheat of the compressor suction and the dryness of the refrigerant flowing into the pipe to be cleaned 4, the pipe cleaning control contents shown in the above-described first to fourth embodiments Instruct. When it is determined that the amount of refrigerant that is filled is excessive or insufficient, determine how much refrigerant to add or charge, and then install the refrigerating and air-conditioning system and perform the cleaning operation. Contact the construction company 44 instructed to instruct to fill or recover the refrigerant. If it is judged from the operation information that the flow rate of the refrigerant required for cleaning is insufficient, and it is determined that the cleaning time will be longer than planned, determine the required cleaning time and ask the contractor to perform the cleaning operation for that time. Give instructions. In this way, by using the centralized management device 34 that is installed remotely to centrally manage the operation information in the pipe cleaning operation, the management company 41 can centrally manage the information and can respond to the information with a certain standard, and the cleaning operation can be reliably performed. As a result, the pipe cleaning can be performed without depending on the skill of the contractor, and the operation reliability of the pipe cleaning can be improved. Further, since the refrigeration / air-conditioning system management company can issue a work instruction from a remote service center, for example, it is possible to save the trouble of going to each installation site and reduce the work time of the pipe cleaning.

Next, with reference to FIG. 25, a method of managing the refrigerating and air-conditioning apparatus during the normal refrigerating and air-conditioning operation of the heat source unit 28 after cleaning the pipe will be described. In this case, the central control device 3
4 receives the operation information of the heat source device 28 from the measurement control device 15 of the heat source device 28. The information received at this time is
Discharge temperature of compressor 1, suction temperature, high pressure, low pressure during operation, rotation speed of compressor 1, fan air volume of heat source side heat exchanger 30, and operating information of indoor unit, that is, use of air conditioner Information such as the air-conditioning set temperature set by the operator, the refrigerant temperature in the use side heat exchanger 23, the room air temperature, the heat exchange amount of the use side heat exchanger 23, and the opening degree of the electronic expansion valve 24 is received. Next, the centralized management device 34 determines whether the heat source device 28 is properly operated after the pipe cleaning operation based on the received information. When it is determined that the heat source device 28 is not operating properly due to, for example, poor cleaning of the pipes, the measurement control device 15 of the heat source device 28 is instructed to operate properly. The heat source unit 28 and the indoor unit 22 are repaired.

For example, when the electronic expansion valve 24 in the indoor unit 22 is fully opened, such as when the opening is wide open, the low-pressure pressure decreases, or the heat exchanger on the use side during cooling operation. The refrigerant temperature of 23 is lower than the expected temperature, the refrigerant temperature of the use side heat exchanger 23 during the heating operation is higher than the expected temperature, or the superheat degree of the use side heat exchanger 23 during the cooling operation is assumed. Higher than the value
Alternatively, when the degree of subcooling of the use side heat exchanger 23 during the heating operation is higher than the expected value, the electronic expansion valve 24
It can be judged that a part of the above is clogged with a residue that could not be cleaned when cleaning the pipe, or a foreign substance mixed in during the installation work.

In such a case, the central control unit 34 firstly opens the opening of the electronic expansion valve 24 when the opening of the electronic expansion valve 24 is still open. To the electronic expansion valve 24
Is sent to the refrigeration / air-conditioning apparatus management company 41. The refrigeration / air-conditioning system management company 41 sees the information and replaces the electronic expansion valve 24.
3, the replacement parts are ordered, and the refrigeration / air-conditioning apparatus management company 41 or the construction company 44 replaces the electronic expansion valve 24.
Further, in order to investigate the cause of the defect at this time, the refrigerating air-conditioning apparatus manager 41 investigates the property of the refrigerating machine oil in the heat source unit 28, and if there is a problem, carries out a coping operation such as refrigerating machine oil exchange.

Further, the electric input of the compressor 1 of the heat source device 28 is larger than the input value of the compressor 1 predicted from the operating conditions of the compressor, that is, the high pressure, the low pressure, the rotation speed, and the suction temperature. In this case, it can be determined that the operation of the compressor 1 is defective. Even in such a case, the refrigeration air-conditioning apparatus management company 41 investigates the properties of the refrigerating machine oil in the heat source unit 28, and if there is a problem, carries out operations such as refrigerating machine oil exchange. If the refrigerating machine oil cannot be replaced, the compressor 1 can be replaced.

As described above, even in the operation of the refrigerating and air-conditioning apparatus after cleaning the pipes, the operating information is managed by the management company using the centralized management apparatus that is installed remotely from the installation site. Information can be dealt with, and the operation of the refrigerating and air-conditioning apparatus can be reliably performed after cleaning the pipes, and the reliability in the operation of the refrigerating and air-conditioning apparatus can be improved.

The function of the centralized control device 34 is set in advance by the measurement control device 33 of the mineral oil recovery device 31 and the heat source device 28.
It may be installed in the measurement control device 15 of FIG. In this case, when there is a matter that requires countermeasures during the washing operation or the normal operation, the measurement control devices 15 and 33 issue an abnormal signal, and the refrigeration / air-conditioning device management company 4 responds to this signal.
1 or the construction company 44 implements maintenance measures, promptly responds to any abnormality that occurs, and shortens work time.

[0108]

The pipe cleaning device according to the present invention is provided with a compression device.
Machine, condenser, expansion device, evaporator are connected and transported by compressor
The existing pipe is washed with the refrigerant that is collected to collect the object to be washed.
Recovery device and the refrigerant flowing into the existing pipe
The heat of the condenser is adjusted so as to obtain a gas-liquid two-phase flow of 0.2 to 0.9.
Exchange capacity, expansion device flow resistance and evaporator heat exchange capacity
And a control device for controlling at least one of
Therefore, the cleaning ability is improved and the operation reliability is high.
A pipe cleaning device can be provided.

In addition, the discharge temperature pipe is connected to the discharge side pipe of the compressor.
Sensor equipped with a sensor, the discharge temperature detected by the discharge temperature sensor
Is controlled so that is less than or equal to a predetermined target value.
Control, so cleaning performance is improved and operational reliability is improved.
A highly efficient pipe cleaning device can be provided.

Furthermore, the heat of condensation of the refrigerant obtained in the condenser
Part or all of it is exchanged as heat of vaporization in the evaporator
Since a high and low pressure heat exchanger for
You can

Furthermore, the physical state of the refrigerant is predetermined.
Change the heat exchange rate of the high and low pressure heat exchanger to reach the target value.
Therefore, the cleaning ability is improved and the operation reliability is improved.
An expensive pipe cleaning device can be provided.

Furthermore, the evaporation flowing out of the high and low pressure heat exchanger
A gas cooling means for cooling the formed refrigerant,
Since the cooling capacity of is changed according to the physical state of the refrigerant,
Cleaning of pipes with improved cleaning ability and high operational reliability
A device can be provided.

The pipe cleaning apparatus according to the present invention is
Connect the compressor, condenser, expansion device, evaporator,
Clean the existing pipes with the transported refrigerant to clean the objects to be cleaned.
The recovery device for recovery and the refrigerant that flows into the existing pipe are the gas-liquid two
The heat exchange capacity of the condenser and the flow of the expansion device
At least one of dynamic resistance and heat exchange capacity of evaporator 1
High pressure to the control device that controls the
A force sensor and a condensation outlet temperature sensor on the outlet side piping of the condenser
High pressure and condensation detected by high pressure sensor
Calculated from the condenser Atsushi Ideguchi sensed from the outlet temperature sensor
The dryness of the gas-liquid two-phase refrigerant to be discharged
Since the control device is controlled so that it is within the standard range, the cleaning ability
And a pipe cleaning device with high operational reliability.
Can be served.

In addition, the pipe cleaning apparatus according to the present invention is
Connect the compressor, condenser, expansion device, evaporator,
Clean the existing pipes with the transported refrigerant to clean the objects to be cleaned.
The recovery device for recovery and the refrigerant that flows into the existing pipe are the gas-liquid two
The heat exchange capacity of the condenser and the flow of the expansion device
At least one of dynamic resistance and heat exchange capacity of evaporator 1
Control device to control the low pressure and the suction side pipe of the compressor.
With a force sensor, the low pressure detected by the low pressure sensor
Control the pressure so that it exceeds a predetermined target value
Controls the control device, improving cleaning ability and operating
It is possible to provide a highly reliable pipe cleaning device.

The pipe cleaning apparatus according to the present invention is
Connect the compressor, condenser, expansion device, evaporator,
Clean the existing pipes with the transported refrigerant to clean the objects to be cleaned.
The recovery device for recovery and the refrigerant that flows into the existing pipe are the gas-liquid two
The heat exchange capacity of the condenser and the flow of the expansion device
At least one of dynamic resistance and heat exchange capacity of evaporator 1
High pressure to the control device that controls the
Equipped with a force sensor,
Control the pressure so that it exceeds a predetermined target value
Controls the control device, improving cleaning ability and operating
It is possible to provide a highly reliable pipe cleaning device.

In addition, the pipe cleaning apparatus according to the present invention is
Compressors, condensers, expanders, evaporators, accumulators
Connect and wash the existing pipe with the refrigerant carried by the compressor.
Flows into the existing equipment and the collection device that cleans and collects the objects to be cleaned.
The heat exchange capacity of the condenser so that the refrigerant
Force, the flow resistance of the expander and the heat exchange capacity of the evaporator
At least one of the control device and the compressor suction
Equipped with a low pressure sensor and suction temperature sensor in the inlet piping
The low pressure and suction temperature detected by the low pressure sensor
Inhalation excess calculated from the inhalation temperature detected by the sensor
The degree of heat is designed to prevent refrigerant from accumulating in the accumulator.
Control device so that the specified target value
Therefore, the cleaning ability is improved and the operation reliability is high.
A pipe cleaning device can be provided.

Furthermore, the operating capacity of the compressor is variable.
With improved cleaning capability, piping with high operational reliability
A cleaning device can be provided.

Further, depending on the operating capacity of the compressor, the refrigerant
Since the control target value of the physical state is determined, the cleaning ability is improved.
And a pipe cleaning device with high operational reliability can be provided.
It

In addition, the refrigerant depending on the flow resistance of the existing pipe is used.
Since the control target value of the physical state of is determined, the cleaning ability is improved.
And a pipe cleaning device with high operational reliability can be provided.
It

Furthermore, the physical state of the refrigerant depends on the ambient temperature.
Since the control target value of
It is possible to provide a pipe cleaning device with high operational reliability.

The pipe cleaning apparatus according to the present invention is
Connect the heat source unit with a compressor and the heat source unit to the pipe to be cleaned.
With a mineral oil recovery device that is connected to the heat source machine or mineral oil recovery
Discharged from compressor to at least one of the devices
Equipped with a heat exchanger that condenses the refrigerant, and a mineral oil recovery device.
Expansion to depressurize the refrigerant condensed by the heat exchanger
Separation of the object to be cleaned from the refrigerant flowing through the device and the piping to be cleaned
The cleaning object recovery means for recovery and the heat source side control of the heat source machine
Controls the operating capacity of the compressor by receiving operating information from the controller.
Since it is equipped with a cleaning side control device,
Even a heat source machine that has not been considered involves major control changes
The pipe cleaning operation can be performed without any need, and the range of application of this heat source machine can be expanded.
Versatility can be improved.

The pipe cleaning apparatus according to the present invention is
Transmission of operation information to the compressor and operation control device installed outside
A heat source device having a heat source side control device that enables the heat source device;
Having a mineral oil recovery device connected between the pipe to be cleaned,
At least one of the heat source machine and the mineral oil recovery system
Equipped with a heat exchanger that condenses the refrigerant discharged from the compressor
And was condensed by the heat exchanger in the mineral oil recovery unit.
The expansion device that decompresses the refrigerant and the cold that flows through the pipe to be washed.
Cleaning means for separating and recovering the cleaning object from the medium, and heat
Driving information between the source control device and / or the driving control device
Equipped with a cleaning-side control device that can transmit information
The equipment is operating information from the heat source side controller and cleaning side control.
The heat exchange amount of the heat exchanger or
Smaller amount of expansion device throttling or compressor operating capacity
Since both control one,
Major control changes even for heat source machines that do not consider pipe cleaning
The pipe cleaning operation can be performed without
The width can be widened and versatility can be improved, and the pipes can be washed.
Even in the purifier, there is a large control change corresponding to the heat source unit.
The pipe cleaning operation can be performed without
It can be expanded and versatility can be improved.

Further, a heat source side controller provided in the heat source device
Between or outside the washing-side control device of the mineral oil recovery device
Operation control device, heat source side control device and cleaning side control
There is a problem in the transmission of driving information between the
Stop the compressor installed in the heat source
Since the heat source side control device was equipped with the function,
Highly reliable cooling that can prevent damage to the heat source due to abnormal operation
You can get a freezing air conditioner.

Further, the heat source side controller and the cleaning side controller
Alternatively, at least one of the operation control devices should be washed with a pipe.
Storage means or display to record the progress of clean operation
Since the display means is provided, the operating status can be confirmed during the pipe cleaning operation.
As a result, the convenience of pipe cleaning operation will increase and
It is easy to deal with the case where the cleaning operation is not carried out sufficiently.
The pipe cleaning operation can be performed more reliably.

Further, the heat source side control device and the cleaning side control device
Or at least one of the operation control devices
Record the completion or incompletion of the pipe cleaning operation in the storage means.
Therefore, you can check the operation status of the pipe cleaning operation
The convenience of turning can be improved.

Furthermore, the pipe cleaning operation was not completed and was interrupted.
In this case, the pipe cleaning operation should be based on the progress record of the pipe cleaning operation.
Cleaning side control device or operation control function to restart clean operation
Since it is equipped with at least one of the equipment, the pipe cleaning
It is possible to carry out the necessary and sufficient driving time for driving.
Therefore, the pipe cleaning operation can be properly performed.

Further, the heat source side control device is equipped with a pipe cleaning operation.
If the completion record is not recorded, wash the pipes in the heat source unit.
Piping cleaning operation is not completed because operations other than cleaning operation are prohibited
Occasionally, perform operations using existing piping such as normal operation.
It is possible to obtain a highly reliable refrigeration air conditioner
it can.

In addition, the pipe cleaning method according to the present invention is
Remove the existing refrigeration and air-conditioning system from the existing piping.
And a pipe cleaning device with a compressor on the existing pipe
And the pipe cleaning device to perform the pipe cleaning operation.
Away from the control step installed in the pipe cleaning device
During pipe cleaning operation that is transmitted to a centralized control device installed at a remote location
High pressure and low pressure during pipe cleaning operation based on
Power, discharge temperature, superheat of compressor suction, flow into existing pipe
Whether the dryness of the refrigerant is set to an appropriate target value.
With the step of judging the suitability of the pipe cleaning operation,
The operation information in the pipe cleaning operation is managed centrally
It can be handled according to the standard and depends on the skill level of the pipe cleaning work.
It is possible to obtain a highly reliable refrigeration air conditioner that does not exist
It

Further, according to the suitability judgment of the pipe cleaning operation,
Change the operation control conditions or the refrigerant amount adjustment.
Since it is equipped with a plug,
The effect of reducing the cleaning work time can be obtained.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of a pipe cleaning device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between the residual amount of mineral oil pipe and the cleaning time according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between a refrigerant flow rate and a compressor rotation speed of the compressor according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a relationship between dryness and temperature of a refrigerant according to the first embodiment of the present invention.

FIG. 5 is a diagram showing another form of the condenser and the evaporator according to the first embodiment of the present invention.

FIG. 6 is a diagram showing another form of the condenser and the evaporator according to the first embodiment of the present invention.

FIG. 7 is a cross-sectional view showing the configurations of a pipe cleaning device and a condenser according to the first embodiment of the present invention.

FIG. 8 is a diagram showing a method of installing a cover in the pipe cleaning device according to the first embodiment of the present invention.

FIG. 9 is a diagram showing another example of the method of installing the cover in the pipe cleaning device according to the first embodiment of the present invention.

FIG. 10 is a diagram showing another example of the method of installing the cover in the pipe cleaning device according to the first embodiment of the present invention.

FIG. 11 is a diagram showing another form using the electronic expansion valve according to the first embodiment of the present invention.

FIG. 12 is a refrigerant circuit diagram showing another mode of the pipe cleaning device according to the first embodiment of the present invention.

FIG. 13 is a refrigerant circuit diagram of the pipe cleaning device according to the second embodiment of the present invention.

FIG. 14 is a diagram showing a form of a high / low pressure heat exchanger according to a second embodiment of the present invention.

FIG. 15 is a diagram showing an operating condition of a pipe cleaning device according to a second embodiment of the present invention.

FIG. 16 is a diagram showing an operating condition when the heat exchange amount of the high / low pressure heat exchanger of the pipe cleaning device in the second embodiment of the present invention is changed.

FIG. 17 is a diagram showing an operating condition of the pipe cleaning device according to the second embodiment of the present invention when the outside air temperature changes.

FIG. 18 is a diagram showing another form of the high and low pressure heat exchanger according to the second embodiment of the present invention.

FIG. 19 is a refrigerant circuit diagram of a pipe cleaning device showing a third embodiment of the present invention.

FIG. 20 is a diagram showing an operating condition of a pipe cleaning device according to a third embodiment of the present invention.

FIG. 21 is a diagram showing an operating condition when the gas cooler fan air volume changes in the pipe cleaning device in the third embodiment of the present invention.

FIG. 22 is a refrigerant circuit diagram of the pipe cleaning device according to the fourth embodiment of the present invention.

FIG. 23 is a refrigerant circuit diagram of another pipe cleaning device according to the fourth embodiment of the present invention.

FIG. 24 is a refrigerant circuit diagram of a pipe cleaning device showing a fifth embodiment of the present invention.

FIG. 25 is a refrigerant circuit diagram of a refrigeration / air-conditioning apparatus according to Embodiment 5 of the present invention.

FIG. 26 is a diagram showing service contents at the time of updating a refrigerating and air-conditioning apparatus according to Embodiment 5 of the present invention.

FIG. 27 is a refrigerant circuit diagram of a conventional refrigeration / air-conditioning system.

FIG. 28 is a relationship diagram of a critical solubility curve showing the solubility of the HFC refrigerating machine oil and the HFC refrigerant when the conventional refrigerating machine oil (mineral oil) is mixed.

[Explanation of symbols]

1 compressor, 2 oil separator, 3 condenser, 4 and 6 pipes (existing pipes, connecting pipes, pipes to be cleaned), 5 bypass pipes, 7 electronic expansion valves, 8 evaporators, 9 separation and recovery devices,
10 Accumulator, 10a Oil return hole, 11 Pipe cleaning device, 12a, 12b, 12c, 12d, 12e, 1
2f connection valve, 13a, 13b, 13c, 13d, 13
e Temperature sensor, 14a, 14b Pressure sensor, 15
Measurement control device, 16 valves, 17 bypass piping, 18
Outside air inlet, 19 Outside air outlet, 20 Cover, 21 Air passage, 22 Indoor unit, 23 Use side heat exchanger, 24 Electronic expansion valve, 25 High and low pressure heat exchanger, 26 Double pipe, 27
Gas cooler, 28 heat source machine, 29 four-way valve, 30 heat source side heat exchanger, 31 mineral oil recovery device, 32a, 32b, 3
2c, 32d check valve, 33 (cleaning side) measurement control device, 34 central control device, 35 (heat source side) measurement control device, 36 operation control device.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Osamu Morimoto 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (56) References JP 2000-9368 (JP, A) JP 6- 221727 (JP, A) JP 63-297784 (JP, A) JP 61-1963 (JP, A) JP 2000-111182 (JP, A) JP 9-105560 (JP, A) Open 2000-320908 (JP, A) JP 2000-329432 (JP, A) JP 7-83545 (JP, A) JP 7-275561 (JP, A) Actually open 62-31987 (JP, U) International publication 96/012921 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 45/00 B08B 9/06 F04B 49/00 321 F16L 55/24

Claims (22)

(57) [Claims] 1. A recovery device, which connects a compressor, a condenser, an expansion device, and an evaporator, and which cleans an existing pipe by a refrigerant carried by the compressor to recover an object to be cleaned, and the existing pipe.
Is a gas-liquid two-phase flow with a dryness of 0.2 to 0.9
As will be, the condenser of the heat exchange capacity, pipe cleaning apparatus characterized by comprising a control device for controlling at least one of the heat exchange capacity of the flow resistance and the evaporator of the expansion device . 2. A discharge temperature sensor is provided in the discharge side pipe of the compressor.
The discharge temperature detected by the discharge temperature sensor is
Set the control device so that it becomes less than or equal to the predetermined target value set in advance.
The pipe cleaning apparatus according to claim 1, wherein the pipe cleaning apparatus is controlled.
Place 3. A part of the heat of condensation of the refrigerant obtained in the condenser.
High or low that heat is exchanged as heat of evaporation in the evaporator
The pressure heat exchanger is provided, The claim 1 characterized by the above-mentioned.
Pipe cleaning device. 4. A target value in which the physical state of the refrigerant is predetermined.
Change the heat exchange amount of the high and low pressure heat exchanger so that
The pipe cleaning device according to claim 3, wherein the pipe cleaning device is a pipe cleaning device. 5. Evaporated cold flowing out of the high and low pressure heat exchanger.
A gas cooling means for cooling the medium,
Changing the cooling capacity according to the physical state of the refrigerant
The pipe cleaning device according to claim 3. 6. A compressor, a condenser, an expansion device and an evaporator are connected.
Continuing, the existing pipe is replaced by the refrigerant conveyed by the compressor.
A recovery device for cleaning and recovering the object to be cleaned, and the existing pipe
So that the refrigerant flowing into the gas becomes a gas-liquid two-phase flow.
Heat exchange capacity, flow resistance of the expansion device and the evaporator
For controlling at least one of the heat exchange capacities of
Device and high pressure sensor on the discharge side piping of the compressor,
The condenser outlet temperature pipe is equipped with a condenser outlet temperature sensor,
High pressure detected by the high pressure sensor and the condensation
Calculated from the condenser outlet temperature detected by the outlet temperature sensor
The dryness of the gas-liquid two-phase refrigerant to be discharged
The control device is controlled so that the standard range is achieved.
Pipe cleaning equipment. 7. A compressor, a condenser, an expansion device and an evaporator are connected.
Continuing, the existing pipe is replaced by the refrigerant conveyed by the compressor.
A recovery device for cleaning and recovering the object to be cleaned, and the existing pipe
So that the refrigerant flowing into the gas becomes a gas-liquid two-phase flow.
Heat exchange capacity, flow resistance of the expansion device and the evaporator
For controlling at least one of the heat exchange capacities of
A low pressure sensor on the suction side of the compressor.
The low pressure detected by the low pressure sensor is
The control device is adjusted so that it becomes equal to or higher than a predetermined target value set in advance.
A pipe cleaning device characterized by controlling the installation. 8. A compressor, a condenser, an expansion device and an evaporator are connected.
Continuing, the existing pipe is replaced by the refrigerant conveyed by the compressor.
A recovery device for cleaning and recovering the object to be cleaned, and the existing pipe
So that the refrigerant flowing into the gas becomes a gas-liquid two-phase flow.
Heat exchange capacity, flow resistance of the expansion device and the evaporator
For controlling at least one of the heat exchange capacities of
Device and a high pressure sensor on the discharge side of the compressor
The high pressure detected by the high pressure sensor is
The control device is adjusted so that it becomes equal to or higher than a predetermined target value set in advance.
A pipe cleaning device characterized by controlling the installation. 9. A compressor, a condenser, an expansion device, an evaporator, and
Connect the accumulator to the refrigerant carried by the compressor.
Therefore, a recovery device that cleans the existing pipes and recovers the objects to be cleaned.
And the refrigerant flowing into the existing pipe becomes a gas-liquid two-phase flow.
The heat exchange capacity of the condenser and the flow resistance of the expander.
And / or at least one of the heat exchange capabilities of the evaporator
Control unit to control the
A low pressure pressure sensor and a suction temperature sensor,
Low pressure detected by a pressure sensor and the suction temperature sensor
Inhalation superheat calculated from the inhalation temperature detected from the
To prevent refrigerant from accumulating in the accumulator.
Control device so that the specified target value
A pipe cleaning device characterized in that 10. The operation capacity of the compressor is variable.
10. The method according to any one of claims 1 to 9, wherein
Pipe cleaning equipment. 11. The refrigerant according to the operating capacity of the compressor
The control target value of a physical state is determined, The claim characterized by the above-mentioned.
10. The pipe cleaning device according to 10. 12. A refrigerant depending on the flow resistance of the existing pipe.
Claim to determine the control target value of the physical state of
The pipe cleaning device according to any one of claims 1 to 11. 13. The physical state of the refrigerant is controlled according to the ambient temperature.
Claim 1 thru | or Claim which determines a target value.
13. The pipe cleaning device according to any one of 12. 14. A heat source device having a compressor, and the heat source device.
And a mineral oil recovery device connected between the pipe to be cleaned and
In the pipe cleaning device, the heat source device or the mineral oil recovery
Discharge from the compressor to at least one of the devices
And a heat exchanger for condensing the generated refrigerant.
The oil recovery device reduces the refrigerant condensed by the heat exchanger.
The expansion device that pressurizes and the refrigerant that has flowed through the pipe to be cleaned.
And a heat recovery device for separating and recovering the cleaning target from the
The operation information is received from the heat source side control device of the source machine,
And a washing-side controller for controlling the operating capacity of the compressor
A pipe cleaning device characterized by the above. 15. An operation control device provided outside the compressor.
With a heat source side control device that can transmit operating information to the
Source machine, ore connected between the heat source machine and the pipe to be cleaned
In a pipe cleaning device having an oil recovery device, the heat source
Machine and / or mineral oil recovery equipment
A heat exchanger for condensing the refrigerant discharged from the compressor
In addition, the heat exchanger is provided in the mineral oil recovery device.
Expansion device to reduce the pressure of the condensed refrigerant and the cleaning target
Cleaning target that separates and recovers the cleaning target from the refrigerant flowing through the pipe
Object recovery means and the heat source side controller or / and the above
Cleaning side control that enables transmission of operation information between operation control devices
Control device, the operation control device, the heat source side control
Operation information from the device and operation from the cleaning side control device
Informed, the heat exchange amount of the heat exchanger or the expansion device throttle
Quantity and / or compressor operating capacity 1
A pipe cleaning device characterized by controlling one of them. 16. A heat source side control device and a mineral oil included in a heat source machine
Between the cleaning side control device of the recovery device or outside
Arranged operation control device, heat source side control device, and cleaning
There is a problem in the transmission of operating information between the
When operating, the operation of the compressor installed in the heat source unit
The heat source side control device is provided with a function to stop.
The pipe cleaning apparatus according to claim 15, wherein 17. A heat source side control device, a cleaning side control device, and
At least one of the operation control devices
A storage means for recording the progress of the transfer or a display for displaying
The means according to claim 15 or 16, characterized in that it is provided with means.
On-board pipe cleaning device. 18. A heat source side control device, a cleaning side control device, and
Is a memory in at least one of the operation control devices
The method should record the completion or incompletion of the pipe cleaning operation.
The method according to any one of claims 15 to 17, characterized in that
The described pipe cleaning device. 19. When the pipe cleaning operation is not completed and is interrupted
The pipe cleaning operation based on the progress record of the pipe cleaning operation.
The controller for cleaning side or the operation controller for restarting the rotation
A contract characterized by having prepared for at least one of
The pipe cleaning device according to claim 18. 20. Completion of pipe cleaning operation in the heat source side control device
If no record is made, pipe cleaning operation at the heat source unit
20. Driving other than turning is prohibited.
The described pipe cleaning device. 21. Is the existing refrigeration / air-conditioning system used for existing piping?
And a compressor in the existing pipe
Installing the pipe cleaning device,
The pipe cleaning operation with the
Centralized management device installed remotely from the control device installed in the purification device
Pipe cleaning based on the information during pipe cleaning operation transmitted to the
High pressure, low pressure, discharge temperature, compressor suction during cleaning operation
The degree of superheat of the refrigerant and the dryness of the refrigerant flowing into the existing pipe are appropriate.
Whether the pipe cleaning operation was appropriate or not was judged to be the standard value.
A method for cleaning pipes, characterized in that
Law. 22. According to the suitability judgment of the pipe cleaning operation,
Steps for changing operation control conditions or refrigerant amount adjustment
The pipe cleaning apparatus according to claim 21, further comprising:
Method.