JP6177002B2 - Refrigerant processing equipment - Google Patents

Description

  The present invention relates to a refrigerant processing apparatus that performs processing such as recovering refrigerant filled in an air conditioning system, regenerating the recovered refrigerant, and charging the regenerated refrigerant into the air conditioning system.

  Patent Document 1 is known as this type of device. The refrigerant processing apparatus shown in Patent Document 1 is connected to a vehicle air conditioning system, and recovers and regenerates the refrigerant from the vehicle air conditioning system by a built-in compressor, evaporator, filter dryer, oil separator, condenser, and refrigerant recovery tank. The recovery and regeneration work and the filling work of adding new refrigeration oil to the recovered refrigerant and filling the vehicle air conditioning system are performed.

  The recovery and regeneration work is performed by connecting the high-pressure hose and low-pressure hose of the device body to the high-pressure service valve and low-pressure service valve of the vehicle air conditioning system and driving the compressor with the vehicle engine stopped. As a result, the refrigerant of the vehicle air conditioning system is introduced in the state of high-pressure liquid, the evaporator is decompressed and vaporized, the refrigeration oil is separated by the oil separator, filtered and dewatered by the filter dryer, and liquefied by the condenser, and the refrigerant recovery tank To be recovered.

  The filling operation is performed by driving the vehicle engine to operate the vehicle air conditioning system. The refrigerant in the refrigerant recovery tank is charged into the vehicle air conditioning system from the low pressure side, and the refrigerant in the refrigerant recovery tank is only a specified amount. By reducing the amount, the vehicle air conditioning system is filled with a specified amount of refrigerant.

  Now, in the gas filling method in which the air conditioning system for a vehicle is operated and the refrigerant in the refrigerant recovery tank is drawn as in the above filling operation, when the outside air temperature is low (for example, 10 ° C. or less), the refrigerant is not vaporized and charged. There is a problem that it takes time to complete or a desired filling amount cannot be obtained. Further, since the vehicle engine is driven in a vacuum state in the vehicle air conditioning system, there is a concern that parts may be damaged, and depending on the vehicle, there is a problem that the system is locked and the engine cannot be driven.

JP 2006-220381 A

  Therefore, the present invention employs a liquid filling method in which the refrigerant is compressed and pressurized in the refrigerant recovery tank to fill the vehicle air-conditioning system with the refrigerant while the vehicle engine is stopped. An object of the present invention is to provide a refrigerant processing apparatus that enables a speedy filling operation without being affected by the outside air temperature when filling, and that can reduce the influence on the vehicle.

In order to solve such a problem, the present invention provides a hose attached to and detached from a service valve of an air conditioning system, a hose pressure sensor that detects the pressure of the hose, a refrigerant recovery tank that stores refrigerant from the air conditioning system, A refrigerant processing apparatus comprising a compressor that collects refrigerant from an air conditioning system into a refrigerant tank and that fills the air conditioning system from the refrigerant tank, and an outside air temperature sensor that detects outside air temperature, the air conditioning of the refrigerant in the refrigerant tank When the system is charged, the system includes control means for driving the compressor in accordance with the outside air temperature detected by the outside air temperature sensor to increase the pressure in the refrigerant tank, and the control means corresponds to the outside air temperature detected by the outside air temperature sensor. The compressor drive time is determined and the refrigerant tank is pressurized by the compressor until the determined drive time elapses. The air conditioning system is filled from the medium tank .

  According to the present invention, when the filling operation is performed with the liquid filling type refrigerant processing apparatus, the pressure in the tank is increased according to the outside air temperature, so that an appropriate amount of the refrigerant can be charged regardless of the surrounding environment to be used. It is possible to carry out stable filling work throughout the seasons. Further, the pressure increase time and pressure increase in the tank are optimized, and temporal efficiency can be improved.

It is a whole block diagram of the refrigerant processing apparatus of this invention. It is a block diagram of the same apparatus. It is a flowchart figure which shows operation | movement of a collection | recovery reproduction | regeneration process. It is a flowchart figure which shows the operation | movement of a pressure | voltage rise filling process. It is a flowchart figure which shows the operation | movement of the pressure | voltage rise filling process in another embodiment.

Hereinafter, the refrigerant processing apparatus of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram showing a refrigerant processing apparatus of the present invention.
Reference numeral 1 denotes an apparatus main body, which extends a high pressure hose 2 and a low pressure hose 3 connected to the high pressure service valve VH and the low pressure service valve VL of the vehicle air conditioning system U. The high-pressure hose 2 and the low-pressure hose 3 include couplers 4 and 5 with check valves at one end, and the other ends are connected to the high-pressure line 6 and the low-pressure line 7 in the apparatus main body 1, respectively. The high-pressure line 6 includes a high-pressure sensor 8 and is connected to an oil separator 9. The low-pressure line 7 includes a low-pressure sensor 10 and is connected to the high-pressure line 6 between the high-pressure sensor 8 and the oil separator 9 via a connection line 11.

  A supply line 12 includes a compressor 13 and a condenser 14, one end connected to the oil separator 9, and the other end connected to the refrigerant recovery tank 15. The compressor 13 serves as a driving source for refrigerant recovery from the vehicle air conditioning system U and refrigerant filling into the vehicle air conditioning system U. The condenser 14 is disposed in the oil separator 9 on the output side of the compressor 13. A tank pressure sensor 16 is provided at a connection portion of the supply pipe 12 with the refrigerant recovery tank 15 and detects the internal pressure of the refrigerant recovery tank 15. An oil drain line 17 connects the oil separator 9 and the refrigerator oil receiver 18, and discharges the refrigerator oil separated by the oil separator 9 to the refrigerator oil receiver 18.

  A load cell 19 is attached to the refrigerant recovery tank 15 and measures the weight of the refrigerant stored in the tank 15. Reference numeral 20 denotes a filling line, which is connected to the connection line 11 from the refrigerant recovery tank 15 and fills the vehicle air conditioning system U with the refrigerant stored in the tank 15 through the high-pressure line 6. Reference numeral 21 denotes a replenishment line, which is connected to the connection line 11, and an oil can 22 for replenishing refrigerating machine oil when charging the regenerated refrigerant, and a new refrigerant when the amount of regenerated refrigerant in the refrigerant recovery tank 15 is insufficient. A chlorofluorocarbon can 23 for refilling the tank 15 is connected.

  Reference numerals 24 to 30 denote solenoid valves for switching the pipe line, and between the connecting position of the high pressure pressure sensor 8 and the connecting pipe line 11 in the high pressure pipe 6 from the connecting position of the solenoid valve 24 and the connecting pipe line 11 to the oil separator 9. Between the connection position of the low-pressure hose 3 in the low-pressure line 7 and the low-pressure sensor 10, the electromagnetic valve 27 in the oil drain pipe 17, and the electromagnetic valve 28 in the filling line 20. In addition, an electromagnetic valve 30 is provided on the oil can 22 side of the replenishment pipeline 21 and an electromagnetic valve 30 is provided on the Freon can 23 side. Reference numerals 31 to 33 are check valves, which are provided with a check valve 31 on the connecting pipe line 11 and a check valve 32 on the oil can 22 side in the refill line 21 and a check valve 33 on the Freon can 23 side. Reference numeral 34 denotes an outside air temperature sensor which is attached to the side surface of the apparatus main body 1 and detects the ambient temperature.

FIG. 2 is a block diagram showing a control system of the refrigerant processing apparatus of the present invention.
A control unit 35 is connected to the high pressure sensor 8, the low pressure sensor 10, the compressor 13, the tank pressure sensor 16, the load cell 19, the solenoid valves 24 to 30, the outside air temperature sensor 34, and the operation board 36. The stored program is executed based on the command from 36, and the compressor 13 and the solenoid valves 24 to 30 are operated according to the signals from the pressure sensors 8, 10, 16, the load cell 19, and the outside air temperature sensor 34. The operation board 36 includes a display unit 37 such as a charging amount display unit for displaying a refrigerant charging amount, a high pressure display unit for displaying a high pressure, a low pressure display unit for displaying a low pressure, and a course selection key.・ Adjustment key to adjust the filling amount, etc. ・ Start key ・ Pause key to pause the work ・ Resume key to resume filling that was stopped halfway ・ End key to return the device to the initial state after all work An input unit 38 is provided.

Then, operation | movement of the refrigerant | coolant processing apparatus comprised in this way is demonstrated.
The regeneration and filling course is a recovery and regeneration process in which almost the entire amount of refrigerant is extracted from the vehicle air conditioning system U, and the apparatus main body 1 separates the refrigerant from the refrigerating machine oil and regenerates it by washing and refilling the refrigerant, replacing the refrigerating machine oil, and the like. Then, a filling process for filling the vehicle air conditioning system U with an appropriate amount of refrigerant is sequentially performed.

<Recovery / Regeneration Step> FIG. 3 is a flowchart. The operator first stops the vehicle engine as a preparatory work, and connects the high-pressure hose 2 of the apparatus main body 1 to the high-pressure service valve VH and low-pressure service valve VL of the vehicle air conditioning system U. The low pressure hose 3 is connected by couplers 4 and 5. In this state, when the “regeneration and filling course” is selected with the course selection key of the operation board 36, the specified refrigerant amount C to be charged is set with the adjustment key while looking at the filling amount display portion, and then the start key is input, the recovery and regeneration step Is started.

  When the recovery operation starts, the pressure PH of the high-pressure hose 2 is confirmed by the high-pressure sensor 8 (1). If a pressure higher than the predetermined value P1 is detected, it is determined that the high-pressure hose 2 is securely attached. Then, the solenoid valves 24 and 25 of the high-pressure line 6 are opened (2), and the compressor 13 is driven (3). With the drive of the compressor 13, the refrigerant of the vehicle air conditioning system U is taken in from the high pressure hose 2 in a high pressure liquid state and introduced into the oil separator 9. The liquid refrigerant introduced into the oil separator 9 is vaporized by decompression by opening the container, and the refrigeration oil contained is separated. The refrigerant from which the oil has been separated is compressed by the compressor 13 and liquefied again, passes through the condenser 14 built in the oil separator 9, and is then collected in the refrigerant collection tank 15. At this time, in the oil separator 9, the liquefied refrigerant is passed through the built-in capacitor 14, whereby the oil separator 9 is heated and heat exchange is performed efficiently.

  Next, when the pressure PH detected by the high pressure sensor 8 in the high pressure line 6 becomes equal to or less than the predetermined value P2 (4), it is determined that the refrigerant remaining on the high pressure side of the air conditioning system U is in a gaseous state. Then, the electromagnetic valve 26 of the low pressure line 7 is opened (5), and the gaseous refrigerant remaining on the high pressure side and the low pressure side of the air conditioning system U is recovered in the refrigerant recovery tank 15. Thereafter, when the pressure PL detected by the low-pressure pressure sensor 10 in the low-pressure line 7 becomes equal to or less than the predetermined value P3 (6), it is determined that almost all of the refrigerant has been recovered, and the electromagnetic valves 24, 25, 26 are turned on. Close (7), stop the compressor 12 (8) and end the recovery.

  When the recovery of the refrigerant is completed, the electromagnetic valve 27 of the discharge pipe 17 is opened (9), and the refrigerating machine oil separated in the oil separator 9 is discharged to the refrigerating machine oil receiver 18, and when a predetermined time T1 elapses (10), the electromagnetic valve 27 is closed (11), the recovery / reproduction process is completed, and a guidance for shifting to the next process is output (12).

<Pressure-filling process> Flowchart of FIG. 4 When the operator inputs a start key according to the guidance in step (12) while the vehicle engine is stopped, the pressure-filling process is started.
When the pressurizing and filling process starts, first, the electromagnetic valve 25 of the high-pressure line 6 and the electromagnetic valve 28 of the filling line 20 are opened (13), and the compressor 13 is driven (14). As the compressor 13 is driven, the refrigerant in the refrigerant recovery tank 15 circulates in the closed circuit, and the tank internal pressure of the refrigerant recovery tank 15 is increased. At this time, the target pressure value Pt of the tank internal pressure of the refrigerant recovery tank 15 is determined according to the outside air temperature detected by the outside air temperature sensor 34 in order to eliminate the difference between the filling time and the filling amount due to the outside air temperature. That is, the outside air temperature T is detected by the outside air temperature sensor 34 (15), and the corresponding target pressure value Po is determined from the prestored target pressure value data for each outside air temperature based on the detected outside air temperature T. (16).

  When the tank pressure sensor 16 detects that the tank internal pressure Po has increased to the target pressure value Pt (17), the compressor 13 is stopped (18), the electromagnetic valve 25 of the high pressure line 6 is closed (19), and the high pressure is reached. The electromagnetic valve 24 of the pipe line 6 is opened (20), and the refrigerant is filled with the internal pressure of the refrigerant recovery tank 15 from the high pressure side of the vehicle air conditioning system U. At the same time, the solenoid valve 29 of the refill line 21 is opened (21), and the refrigeration oil in the oil can 22 is injected into the vehicle air conditioning system U.

  When it is detected by the load cell 19 that the refrigerant in the refrigerant recovery tank 15 has decreased by the specified refrigerant amount C (22), it is determined that the vehicle air conditioning system U has been filled with the refrigerant of the predetermined amount C, and the high pressure pipe The electromagnetic valve 25 of the path 6 and the electromagnetic valve 28 of the filling pipe line 20 are closed (23), the boosting and filling process is completed, and a process end guidance is output (24).

  As described above, in the present invention, the refrigerant is extracted from the vehicle air conditioning system U in the recovery and regeneration process, and the extracted refrigerant is recovered by separating the refrigerating machine oil with the oil separator 9, and then recovered in the refrigerant recovery tank 15, and the boosting and filling process. Thus, the refrigerant recovery tank 15 is pressurized and the vehicle air conditioning system U is filled with the refrigerant in the tank. When the pressure inside the tank is increased, the target pressure value Pt for pressure increase is determined by the outside air temperature T, so that stable filling work can be performed even if the outside air temperature varies depending on the season, time zone, or the like.

FIG. 5 shows the operation of the boosting filling process in another embodiment.
In this boosting and filling step, the driving time Mt of the compressor 13 is determined based on the detected outside air temperature T. That is, based on the outside air temperature T detected by the outside air temperature sensor 34, the corresponding driving time Mt is determined from the driving time data for each outside air temperature stored in advance (16) ′. Thereafter, when the drive time Mt elapses (17) ′, the compressor 13 is stopped, and the operation of the process (19) in FIG. 4 is executed thereafter.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 6 High pressure line 7 Low pressure line 8 High pressure sensor 10 Low pressure sensor 12 Supply line 13 Compressor 15 Refrigerant recovery tank 16 Tank pressure sensor 20 Filling line 24-30 Solenoid valve 34 Outside air temperature sensor 35 Control unit U Vehicle air conditioning system VH High pressure service valve VL Low pressure service valve

Claims (1)

A hose that is attached to and detached from a service valve of the air conditioning system, a hose pressure sensor that detects the pressure of the hose, a refrigerant recovery tank that stores refrigerant from the air conditioning system, and a refrigerant tank that collects the refrigerant from the air conditioning system into the refrigerant tank A refrigerant processing apparatus comprising an air temperature system for detecting the outside air temperature and a compressor for filling the air conditioning system with an air temperature sensor for detecting the outside air temperature. Control means for driving the compressor according to the outside air temperature to be detected to increase the pressure in the refrigerant tank,
The control means determines the drive time of the compressor according to the outside air temperature detected by the outside air temperature sensor, boosts the inside of the refrigerant tank by the compressor until the determined drive time elapses, and then transfers the refrigerant tank to the air conditioning system. The refrigerant processing apparatus is characterized by performing charging .

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