JP4105014B2 - Fluorocarbon regeneration processing device in vehicle air conditioning system - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a chlorofluorocarbon regenerating apparatus for filtering and dewatering chlorofluorocarbon filled in a vehicle air conditioning system and returning it to the air conditioning system again.
[0002]
[Prior art]
Conventionally, as described in Japanese Utility Model Publication No. 1-5716, this kind of device is temporarily collected in a tank by a vacuum pump while filtering the refrigerant in the body to be collected, and the collected regenerated refrigerant is coupled. While confirming the pressure with a meter, the refrigerant in the collection target is once collected in the tank and measured to measure the appropriate amount as described in JP-A-4-103975. There was a device to return it to the recovery body.
[0003]
[Problems to be solved by the invention]
However, in the former apparatus, the chlorofluorocarbon is once collected in the tank by evacuation, and depending on the outside air temperature and the performance of the pump at that time, the chlorofluorocarbon collecting work takes several tens of hours. In addition, the refilling relies only on pressure measurement with a coupled meter, and the appropriate pressure changes depending on the outside air temperature and the engine operating status of the vehicle. The amount tends to vary.
[0004]
In the latter device, filling is based on the measurement of Freon, so it can be performed accurately, but there are some vehicles in which the filling amount is not specified, and in that case, it cannot be handled. Further, like the former apparatus, it takes a considerable time for evacuation, and it cannot deal with a customer who has not enough time.
[0005]
[Means for Solving the Problems]
In order to solve such problems, the present invention detects high-pressure and low-pressure hoses connected to high-pressure and low-pressure service valves provided in a vehicle air-conditioning system and high-pressure and low-pressure pressures of the vehicle air-conditioning system. High pressure and low pressure sensors, a filter dryer for removing moisture and impurities from chlorofluorocarbon, an evaporator for vaporizing liquefied chlorofluorocarbon under reduced pressure, a compressor, a condenser for condensing and liquefying chlorofluorocarbon, and a tank for storing liquefied chlorofluorocarbon , Metering means for metering the tank, pipe switching means, vehicle engine speed detecting means, outside air temperature sensor, preset means for presetting the specified amount of chlorofluorocarbon in the air conditioning system, A chlorofluorocarbon regeneration processing apparatus in a vehicle air-conditioning system having a control means for stopping and switching, the vehicle engine and air-conditioning system The liquefied chlorofluorocarbon in the air conditioning system introduced from the high pressure service valve is filtered and dehydrated by the filter dryer while the system is operated, and the evaporator reduces the pressure and vaporizes the air conditioning system from the low pressure service valve. After the cycle of returning to the inside continues for a predetermined time, the high-pressure side chlorofluorocarbon pressure in the air-conditioning system is replenished to the air-conditioning system from the low-pressure service valve so that the high-pressure side chlorofluorocarbon pressure becomes a specified pressure corresponding to the predetermined engine speed and outside air temperature. Or, in a state in which the chlorofluorocarbon in the air conditioning system is recovered from the high-pressure service valve into the tank and the vehicle engine and the air conditioning system are stopped, the air conditioning system pressure is reduced to a predetermined pressure or lower. Vacuum is driven by driving the compressor and introduced from the high-pressure and low-pressure service valves. The liquefied and vaporized chlorofluorocarbon is filtered and removed by the filter dryer, depressurized and vaporized by the evaporator, sucked to the suction side of the compressor, and vaporized chlorofluorocarbon discharged from the discharge side is condensed and liquefied by the condenser. When the liquefied chlorofluorocarbon in the tank is once stored in the tank and then returned to the negative pressure air conditioning system, the decrease in the liquefied chlorofluorocarbon in the tank measured by the measuring means is stored in the preset means. It is an object of the present invention to provide a chlorofluorocarbon regeneration processing device in a vehicle air-conditioning system that can selectively execute any one of the evacuation regeneration processing steps that are completed when the preset value is reached. Is.
[0006]
In addition, the apparatus includes a service can mounting portion containing liquefied chlorofluorocarbon, and when the liquefied chlorofluorocarbon in the tank falls below a predetermined value during the circulation regeneration process, the process is temporarily interrupted and the mounting portion When liquefied chlorofluorocarbon is replenished from the service can attached to the tank, and the preset value is larger than the amount of liquefied chlorofluorocarbon stored in the tank at the end of evacuation in the evacuation regeneration processing step For example, after the evacuation is completed, it is more preferable that the liquefied chlorofluorocarbon is replenished into the tank from the service can attached to the attachment portion.
[0007]
Further, it is more preferable to provide an indicator that receives the output of the engine speed detecting means and displays whether the engine speed is maintained at a predetermined engine speed during the circulation regeneration processing step.
[0008]
Further, in the circulation regeneration processing step, when the Freon in the tank is replenished into the air conditioning system from the low pressure service valve, it is more preferable that the replenishment is performed intermittently.
[0009]
The intermittent replenishment is interrupted when the low-pressure side pressure becomes a first predetermined pressure higher than a specified pressure, and then replenished when a second predetermined pressure higher than the specified pressure but lower than the first predetermined pressure is reached. If the cycle of restarting is repeated, a more preferable aspect is obtained.
[0010]
Further, it is more preferable to provide a fine adjustment means for finely adjusting the chlorofluorocarbon filling amount after completion of the circulation regeneration processing step and the evacuation regeneration processing step.
[0011]
[Action]
The operator selects one of the circulation regeneration process and the vacuum regeneration process.
If the amount of chlorofluorocarbon in the air conditioning system of the customer's vehicle that desires regeneration cannot be confirmed, or if the customer does not have much time, the circulation regeneration process is selected. At this time, since the vehicle engine is driven, the liquefied chlorofluorocarbon in the air conditioning system is introduced into the device from the high pressure service valve by the pressure of the compressor of the air conditioning system, and the introduced liquefied chlorofluorocarbon is filtered and removed by the filter dryer. It is watered and vaporized by an evaporator and drawn into the air conditioning system through a low-pressure service valve. By continuing this cycle for about 1 minute, the Freon regeneration in the air conditioning system is completed. After that, in a state where the engine is maintained at a predetermined number of revolutions, the high-pressure side pressure of the chlorofluorocarbon of the air conditioning system is replenished from the tank in the apparatus or the tank so that it becomes a specified pressure with respect to the outside air temperature detected by the outside air temperature sensor. It is collected in.
In addition, when the customer has a relatively long time and the chlorofluorocarbon prescribed amount in the air conditioning system is known, the prescribed amount is preset and the evacuation regeneration processing step is selected. At this time, since the vehicle engine is stopped, the chlorofluorocarbon in the air conditioning system is drawn into the device from the low pressure and high pressure service valves by the compressor of the device, filtered and dewatered by the filter dryer, and vaporized by the evaporator. It is introduced into the suction side of the compressor at a low pressure, liquefied by a condenser, and once recovered in the tank. The evacuation is performed for several tens of minutes until the pressure in the air conditioning system becomes equal to or lower than the predetermined pressure, and then the chlorofluorocarbon in the tank is filled into the air conditioning system until the preset amount reaches the preset amount.
[0012]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of the present invention. A coupler 2 and 3 with check valves for fitting with high-pressure and low-pressure service valves provided in an air conditioning system of a vehicle are provided at the tip of the apparatus body 1. The high-pressure and low-pressure hoses 4 and 5 of a predetermined length attached to the pipe 1 are extended. The high-pressure hose 4 is connected to the pipe line 6 in the main body 1, and the low-pressure hose 5 is connected to the pipe line 7. The pipe 6 is provided with a high pressure sensor 8, a filter dryer 9 for removing impurities and moisture from the liquefied chlorofluorocarbon, and an evaporator 10 for vaporizing the liquefied chlorofluorocarbon under reduced pressure. A pressure sensor 11, a liquefied fluorocarbon-containing service can 12a mounting portion 12, and a lubricating oil-containing service can 13a mounting portion 13 are provided. Further, a pipeline 14 is connected to the pipeline ends of the pipelines 6 and 7, and a pipeline 15 is connected to the pipelines 6 and 7, and the pipeline 14 is used to condense and liquefy the compressor 16 and the chlorofluorocarbon. A capacitor 17 is disposed, and a tank 18 for merging with the pipe line 15 and storing liquefied chlorofluorocarbon is disposed at the end. A safety valve 19 is attached to the upper part of the tank 18 so that when the pressure in the tank 18 exceeds a predetermined level, the air is released to the atmosphere and the air in the upper part of the tank 18 is released. Further, the weight of the liquefied fluorocarbon stored in the tank 18 is measured by a load cell 20 attached to the tank 18. In each of the pipes, solenoid valves 21 to 26 for switching the pipes and check valves 27 to 32 for preventing backflow are interposed.
[0013]
FIG. 2 shows the operation unit. In the upper part, a filling amount display unit 33 for displaying the liquefied chlorofluorocarbon filling amount, a high pressure display unit 34 for displaying the pressure on the high pressure side, and what level the vehicle engine speed is currently at. And a low pressure indicator 36 for displaying the pressure on the low pressure side. The indicator is composed of a plurality of vertically embedded LEDs, and only the yellow LED group in the low rotation range, the yellow LED group and the green LED group in the proper rotation range, and yellow and yellow in the high rotation range. A green LED group and a red LED group are lit. In the lower part, a circulation regeneration key 37 for selecting a circulation regeneration course, an additional filling key 38 for selecting an additional filling course, a vacuum regeneration key 39 for selecting a vacuum regeneration course, and a preset amount are set. Or a key 41 for finely adjusting the filling amount, an oil injection key 42 for injecting oil, a start key 43 for starting the selected course, or for temporarily interrupting the operation. A stop key 44 and an end key 45 for returning the apparatus to the initial state after the completion of all work are arranged in order from the left in consideration of operability. And in order to alert | report the present work condition, the work to perform next, the content of a maintenance, etc., LED is each arrange | positioned so that it may show with a small circle around a display part or a key part.
[0014]
FIG. 3 is a block diagram, and as shown in the figure, the control means 46 constituted by a microcomputer or the like receives signals from each key or sensor and operates each device of the apparatus based on a program. It has become. In the figure, 47 is connected to the battery terminal of the vehicle, detects the change in voltage and picks up the engine speed as engine speed, 48 is an outside air temperature sensor for detecting outside air temperature, and 49 is a speaker for outputting various sounds. It is.
[0015]
Next, the operation of the present apparatus will be described based on the flowchart and the fluid movement diagram.
[0016]
FIG. 4 is a flowchart showing a course that can be executed by the apparatus of the present invention. As shown in the figure, the apparatus can select a course of a circulation regeneration course, an additional filling course, and a vacuum regeneration course. ing.
[0017]
First, the circulation reproduction course will be described based on the flowchart of FIG. By the way, this course is selected when the amount of chlorofluorocarbon in the air conditioning system of the customer's vehicle is unknown or when the customer does not have much time.
[0018]
First, as shown in FIG. 6, the operator connects the couplers 2 and 3 to the high-pressure and low-pressure service valves 51 and 52 of the air conditioning system 50 and detects the rotational speed at the battery terminal of the vehicle in order to detect the engine rotational speed. The cable which is means 47 is connected, and the engine of the vehicle is driven. Then, in the air-conditioning system 50, the vaporized fluorocarbon compressed by the compressor 53 is condensed and liquefied by the condenser 54, passed through the liquid tank 55, opened to a low pressure by the expansion valve 56, and vaporized by the evaporator 57.
[0019]
In this state, the operation unit selects and presses the circulation regeneration key 37 to be performed this time because the LEDs in the vicinity of the circulation regeneration key 37, the additional filling key 38, and the evacuation regeneration key 39 are blinking. Then, the LED in the vicinity of the circulation reproduction key 37 is turned on, and the other LEDs 38 and 39 are turned off to inform the operator that circulation reproduction is performed this time. Next, in order to prompt the user to press the start key 43, the LED in the vicinity of the start key 43 starts blinking. Before that, it is decided whether or not to inject oil into the regenerated fluorocarbon, and the oil injection key 42 is selected. (Step 1). In this case, the oil injection key 42 is pressed to inject oil. Then, in order to notify that the oil injection key 42 is selected, the LED in the vicinity of the oil injection key 42 is turned on. Next, when the start key 43 is pressed (step 2), the LEDs in the vicinity of the start key 43 are switched from blinking to lighting, informing that the cyclic reproduction has started. In the circulation regeneration, first, the voltage change detected by the rotation speed detection means 47 is introduced into the control means 46, and the control means 46 determines whether or not the engine is being driven reliably (step 3). Further, since the discharge pressure of the compressor 53 is applied to the pressure sensor 8, the control means 46 determines whether the air conditioning system 50 is driven by a signal output from the pressure sensor 8 (step 4). The reason for making the determination is that the circulation regeneration is a course performed by using the pressure of the compressor 53 of the air conditioning system 50.
[0020]
When each driving is confirmed, the engine / air conditioner ON LED is turned on, the solenoid valves 21 and 22 are opened (step 5), and the chlorofluorocarbon in the air conditioning system 50 is indicated by a one-dot chain line and an arrow in FIG. The playback LED lights up. The liquefied chlorofluorocarbon on the vehicle side is filtered and drained by the filter dryer 9, reduced in pressure by the evaporator 10, and returned to the air conditioning system 50. By repeating this cycle time t1 counted by a timer included in the control means 46 (t1 can be adjusted, but is normally set to about 1 minute), the CFC in the air conditioning system 50 is repeated. Is played.
[0021]
After the elapse of time t1 (step 6), the solenoid valve 21 is closed, and in order to allow the control means 46 to obtain an accurate chlorofluorocarbon filling pressure of the air conditioning system 50 in the subsequent process, the rotation speed maintaining LED is turned on. At the same time, a voice message “Please maintain the engine at an appropriate speed” is output (step 7). As a result, the operator gets into the driver's seat of the vehicle, operates the accelerator, and temporarily maintains the engine at an appropriate rotational speed while looking at the indicator 35.
[0022]
By the way, the air conditioning system 50 repeats an on / off operation of turning off when the temperature in the passenger compartment reaches a set temperature and turning on when the temperature of the vehicle interior deviates to some extent. Corresponding to this on / off operation, the load factor of the engine also changes. When the air conditioning system 50 is on, the engine speed decreases, and when it is off, the engine speed increases. Therefore, as described above, every time the air-conditioning system 50 repeats the on / off operation, even if the operator depresses the accelerator pedal by a predetermined amount to make the indicator 35 have an appropriate number of revolutions and the depression amount is substantially constant, It will deviate from the proper rotation speed. Correspondingly, it is troublesome for the operator to change the pedal depression amount each time, and only the pressure when the air-conditioning system 50 is in the on state needs to be detected in order to determine the state of filling of the Freon. Therefore, in this apparatus, it is assumed that the air conditioning system 50 is initially turned on, and if the engine speed increases after the engine is held at an appropriate speed, the air conditioning system 50 is actually turned off from on. For the operator, the pedal can be left as it is, or if the air pedal is lowered, the air conditioning system 50 is actually turned from off to on. In order to step in, write it in the instruction manual, or only in the latter case, make a voice output saying “Maintain the engine at the proper speed again”.
[0023]
By doing so, the control means 46 determines that the air-conditioning system 50 is on when the engine speed is proper and the pressure detected by the pressure sensor 8 tends to increase. When the pressure value is displayed on the high pressure display 34 and the pressure detected by the pressure sensor 8 tends to decrease when the engine speed increases, it is determined that the air conditioning system 50 is off. The pressure value when the air-conditioning system 50 is determined to be on is held in the high pressure display 34 while ignoring the pressure value. As a result, the operator does not need to change the depression amount of the accelerator pedal each time, and the pressure value measured and displayed is an accurate value.
[0024]
When the engine speed is maintained at an appropriate speed as described above (step 8), the control means 46 turns on the oil injection LED and performs the previously set oil injection operation. Here, by injecting oil, the pressure sensor 8 first detects the pressure on the high pressure side so that the chlorofluorocarbon filling into the air conditioning system 50 is not overfilled (step 9). If the detected pressure is less than or equal to p1 (a value that the air-conditioning system 50 is expected not to be overfilled even after oil injection), the solenoid valve 24 is opened (step 10), and as shown in FIG. The oil in the oil can 13a is filled from the low pressure side of the air conditioning system 50. Thereafter, when there is no change in the pressure detected by the pressure sensor 11 within a predetermined time, it is determined that all the oil in the oil can 13a is filled (step 11), and the electromagnetic valves 22 and 24 are closed (step 12). The oil injection operation ends. Further, if the detected pressure is larger than p1, in order to perform recovery by determining that it is overfilled, the solenoid valves 21 and 26 are opened and the compressor 16 is driven (step 13), as shown in FIG. Liquefied CFC in the air conditioning system 50 is drawn from the high pressure side until the pressure detected by the pressure sensor 8 is equal to or lower than p1, and is temporarily evaporated by the evaporator 10, compressed by the compressor 16, and liquefied again by the condenser 17. It is introduced into the tank 18 (at this time, part of the vaporized chlorofluorocarbon is returned to the low pressure side of the air conditioning system 50 so that the pressure does not increase too much before the compressor 16). When the pressure reaches p1 (step 14), the solenoid valves 21 and 26 are closed, the compressor 16 is stopped (step 15), and the oil injection operation is started.
[0025]
When the oil injection operation is thus completed, the filling amount adjustment LED is turned on, and the final operation of adjusting the chlorofluorocarbon filling amount in the air conditioning system 50 is performed. First, the pressure detected by the pressure sensor 8 is an appropriate pressure p0 (in the state where the engine speed is maintained at an appropriate speed, the pressure on the high-pressure side of the air conditioning system with respect to the outside air temperature at that time has a range of plus or minus several percent. ) (Step 16), the electromagnetic valves 22 and 25 are opened for additional filling into the air conditioning system 50 (step 17). Then, as the liquefied CFC in the tank 18 is at a high pressure and the compressor 53 of the air conditioning system 50 is driven, the liquefied CFC in the tank 18 is vaporized by the evaporator 10 as shown in FIG. Filling from 50 low pressure side. If the liquefied chlorofluorocarbon in the tank 18 becomes less than A (the minimum amount capable of maintaining the pressure at which the chlorofluorocarbon in the tank 18 can exist as a liquid) on the way (step 18), to replenish it. The electromagnetic valves 22 and 25 are once closed, the electromagnetic valve 23 is opened, and the compressor 16 is driven (step 19). As shown in FIG. 10, the liquefied chlorofluorocarbon in the service can 12a is evaporated by the evaporator 10 under reduced pressure. Compressed by the compressor 16, liquefied again by the condenser 17 and replenished in the tank 18. Eventually, when the amount of chlorofluorocarbon in the tank 18 reaches B (larger than A and an amount that leaves a margin for evacuation during the evacuation regeneration described later) (step 20), the replenishment to the tank 18 is completed and electromagnetic The valve 23 is closed, the electromagnetic valves 22 and 25 are opened and the compressor 16 is stopped (step 21), and the liquefied chlorofluorocarbon in the tank 18 is filled into the air conditioning system 50. Eventually, when the pressure detected by the pressure sensor 8 reaches p2 (slightly lower than the appropriate pressure p0) (step 22), the solenoid valves 22 and 25 are closed (step 23) and detected again by the pressure sensor 8. If the pressure to be measured is the appropriate pressure p0, the filling amount adjusting operation is finished.
[0026]
When the pressure detected by the pressure sensor 8 is equal to or higher than the appropriate pressure p0 after the oil injection operation is completed (step 24), the solenoid valve 21 is used to recover the overfilled CFC in the air conditioning system 50. , 22 and 26 are opened, and the compressor 16 is driven (step 25). Then, like the overfill recovery performed before the oil injection shown in FIG. 8, the liquefied chlorofluorocarbon in the air conditioning system 50 is drawn from the high pressure side, temporarily evaporated by the evaporator 10, and compressed by the compressor 16. It is liquefied again by the condenser 17 and introduced into the tank 18. When the pressure detected by the pressure sensor 8 reaches p2 (step 26), the solenoid valves 21, 22, and 26 are closed, the compressor 16 is stopped (step 27), and the pressure sensor 8 detects again. If the pressure to be measured is the appropriate pressure p0, the filling amount adjusting operation is finished.
[0027]
However, in actuality, when additional filling from the tank 18 into the air conditioning system 50 is performed while the electromagnetic valves 22 and 25 are kept open, the high pressure side pressure of the air conditioning system 50 reaches the appropriate pressure p0. When this happens, the low pressure side of the air conditioning system 50 is filled with a specified amount or more of chlorofluorocarbon, and when the high pressure side pressure of the air conditioning system 50 becomes stable after the solenoid valves 22 and 25 are closed, the proper pressure is reached. p0 is exceeded. This is because the chlorofluorocarbon in the tank 18 is at a high pressure, and the chlorofluorocarbon is filled into the low pressure side of the air conditioning system 50 by the pressure until the chlorofluorocarbon is condensed and liquefied from the low pressure side to the high pressure side. This is because it takes some time. Therefore, in order to absorb this time difference, for example, when the pressure on the low pressure side of the air conditioning system 50 reaches four times the specified pressure, the solenoid valve 25 is once closed to interrupt the filling of the Freon, and as the condensation liquefaction proceeds, the pressure decreases. When the side pressure drops to twice the specified pressure, the solenoid valve 25 is opened again to refill chlorofluorocarbon, and when this pressure is repeated, the solenoid valve 22 is reached when the pressure on the high pressure side eventually reaches the appropriate pressure p0. , 25 is ideally closed to end the filling amount adjusting operation.
[0028]
In any case, if the pressure finally detected by the pressure sensor 8 is the appropriate pressure p0, the sound “Regeneration is complete. Remove the coupler and press the end key” is output (step 28) All the LEDs other than those near the end key 45 are extinguished and only the LEDs near the end key 45 blink. The operator removes the couplers 2 and 3 from the high-pressure and low-pressure service valves 51 and 52 according to this voice, and presses the end key 45 (step 29). Then, in order to collect all the chlorofluorocarbon remaining in the pipe of the apparatus in the tank 18, the electromagnetic valves 21, 22, and 26 are opened, and the compressor 16 is driven (step 30). Then, as shown in FIG. 11, the inside of the pipe line is evacuated and collected in the tank 18 as liquefied chlorofluorocarbon. Eventually, when the pressure detected by the pressure sensor 8 or 11 becomes equal to or lower than p3 (negative pressure) (step 31), the solenoid valves 21, 22, and 26 are closed, the compressor 16 is stopped, and the vacuum in the apparatus pipe line is stopped. The drawing is finished, and the LED near the end key 45 is turned off. If the additional filling operation is performed as described above, the filling amount measured by the load cell 20 is displayed on the filling amount display unit 33 as the additional filling amount, and all the processes of circulation regeneration are completed (step 32). Here, the reason for finally evacuating is that if it is unknown in what state the chlorofluorocarbon remains in the pipe line, inconvenience occurs in the next regeneration process. It is also for accurately measuring the filling amount. In the circulation regeneration course as described above, the time required for the filtration / water removal of the chlorofluorocarbon, the oil injection, and the adjustment of the chlorofluorocarbon amount is about several minutes.
[0029]
However, in reality, when the pressure of the compressor 53 of the air conditioning system 50 is not sufficiently increased due to secular change, it is overfilled, and conversely, the temperature of the condenser 54 is considerably increased due to engine heat. May be underfilled. Therefore, in this case, it may be necessary to finely adjust the filling amount in order to obtain the original chlorofluorocarbon prescribed amount. In this apparatus, in order to cope with such a case, when the start key 43 is pressed before the end key 45 is pressed, the fine adjustment mode is once entered. In the fine adjustment mode, filling and collection can be performed in units of a predetermined amount by using the + key 40 and the-key 41, so that the operator keeps the engine speed at an appropriate speed again and checks the sight glass provided in the air conditioning system 50. Depending on the situation, the + key 40 or the-key 41 can be operated as many times as necessary to finely adjust the appropriate filling amount.
[0030]
The above is a description of the case of oil injection, but the description of the case of no oil injection (steps 33 to 39 and steps 16 to 32) is omitted because it is the same process except the oil injection process.
[0031]
Next, the vacuum regeneration course will be described based on the flowchart of FIG. By the way, in this course, the specified amount of chlorofluorocarbon in the air conditioning system of the customer's vehicle is specified in the customer's vehicle itself or is known from data prepared in advance by the manufacturer of this device, or the customer has a relatively long time margin. It is a course to choose when there is.
[0032]
The operator first connects the couplers 2 and 3 to the high-pressure and low-pressure service valves 51 and 52 of the air conditioning system 50 as shown in FIG. In this case, however, the engine is not driven. Here, as in the case of the circulation regeneration course, by connecting the cable of the engine speed detecting means 47 to the battery terminal of the vehicle, in the unlikely event that the engine is driven that is not necessary in the vacuum regeneration course. In order to prevent idling of the air-conditioning system 50, etc., when the evacuation regeneration key 39 is pressed, the driving of the apparatus is temporarily stopped and the sound is output so as to stop the driving of the engine. In addition, when the engine speed detecting means 47 is not connected to the battery, a sound prompting connection is output.
[0033]
In this state, in the operation unit, the LEDs near the circulation regeneration key 37, the additional filling key 38, and the evacuation regeneration key 39 are blinking. Therefore, the evacuation regeneration key 39 to be performed this time is selected and pressed. Then, the LED in the vicinity of the evacuation regeneration key 39 is turned on, the other LEDs in the vicinity of the keys 37 and 38 are turned off, and this time the operator is informed that the evacuation regeneration is performed, and the specified CFC amount C of the air conditioning system 50 The LED in the vicinity of the + key 40 and the − key 41 blinks and the standard filling amount D stored in advance on the apparatus side is temporarily displayed on the filling amount display unit 33. Here, when the prescribed chlorofluorocarbon amount C is different from the standard filling amount D, the operator changes the filling amount to the prescribed chlorofluorocarbon amount C by pressing the + key 40 or the − key 41 while looking at the filling amount display portion 33. Keep it.
[0034]
Next, in order to prompt the user to press the start key 43, the LED in the vicinity of the start key 43 starts blinking. Before that, it is decided whether or not to inject oil into the regenerated fluorocarbon, and the oil injection key 42 is selected. . The oil injection key 42 is pushed down this time assuming that oil is to be injected (step 40). Then, in order to notify that the oil injection key 42 is selected, the LED in the vicinity of the oil injection key 42 is turned on. Next, when the start key 43 is pressed (step 41), the display of the filling amount display unit 33 is temporarily turned off, and the LED in the vicinity of the start key 43 is switched from blinking to lighting to notify that vacuum regeneration is started.
[0035]
When evacuation regeneration is started, the solenoid valves 21, 22, 24, and 26 are opened, and the compressor 16 is driven (step 42). As shown in FIG. Then, it is filtered and removed by the filter dryer 9, liquefied by the condenser 17, and collected in the tank 18. At this time, the oil injection LED is turned on, and the oil in the oil can 13a is also drawn into the tank 18.
[0036]
Thereafter, when the pressure detected by the pressure sensor 8 becomes equal to or lower than p3 (negative pressure) (step 43) and it is determined that all the chlorofluorocarbon in the air conditioning system 50 has been drawn into the tank 18, the chlorofluorocarbon in the tank 18 is subsequently continued. It is determined whether or not the amount is equal to or greater than E (A + the specified chlorofluorocarbon amount C), that is, whether or not the specified chlorofluorocarbon amount C can be filled in the air conditioning system 50 thereafter (step 44). At this time, if it is determined that the amount of chlorofluorocarbon in the tank 18 is insufficient, the electromagnetic valve 23 is opened (step 45), and the chlorofluorocarbon in the service can 12a is in the required amount tank 18 as shown in FIG. After being drawn in, when the amount of chlorofluorocarbon in the tank 18 reaches E (step 46), the electromagnetic valve 23 is closed (step 47). In any case, if it is determined that the amount of chlorofluorocarbon in the tank 18 is sufficient, the electromagnetic valves 22, 24, and 26 are closed, the compressor 16 is stopped, and the evacuation is finished (step 48).
[0037]
When the evacuation is completed, the filling LED is turned on, the electromagnetic valve 25 is opened, and the liquefied chlorofluorocarbon in the tank 18 is filled in the evacuated air conditioning system 50 as shown in FIG. Eventually, when the amount of chlorofluorocarbon in the tank 18 decreases by -C (step 49), the solenoid valves 21 and 25 are closed assuming that the specified amount of chlorofluorocarbon has been filled in the air-conditioning system 50, and "regeneration is completed. "Please press the key" is output (step 50), and all the LEDs except for the vicinity of the end key 45 are turned off, and the LEDs near the end key 45 blink. The operator removes the couplers 2 and 3 from the high-pressure and low-pressure service valves 51 and 52 according to the voice and presses the end key 45 (step 51). Then, in order to collect all the chlorofluorocarbon remaining in the pipe of the apparatus in the tank 18, the electromagnetic valves 21, 22, and 26 are opened, and the compressor 16 is driven (step 52). Then, as shown in FIG. 11, the inside of the pipe line is evacuated and collected in the tank 18 as liquefied chlorofluorocarbon. Eventually, when the pressure detected by the pressure sensor 8 or 11 becomes equal to or lower than p3 (negative pressure) (step 53), the solenoid valves 21, 22, and 26 are closed, the compressor 16 is stopped, and the evacuation is finished. The LED near the end key 45 is turned off. If the amount of chlorofluorocarbon drawn into the tank 18 from the air conditioning system 50 is less than the amount of chlorofluorocarbon filled, the filling amount display unit 33 displays it as an additional filling amount, and all the processes of vacuum suction regeneration are completed. (Step 54). If oil is not injected, the solenoid valve 24 is not opened at the start of evacuation, and the subsequent operation is the same as described above (steps 55 and 56).
[0038]
However, in actuality, it may be overfilled or underfilled due to a preset input error or the like. Therefore, in this case, it may be necessary to finely adjust the filling amount in order to obtain the original chlorofluorocarbon-regulated amount as in the above-described circulation regeneration processing step. In this apparatus, in order to cope with such a case, when the start key 43 is pressed before the end key 45 is pressed, the fine adjustment mode is once entered. In the fine adjustment mode, the filling or recovery can be performed in units of a predetermined amount by the + key 40 and the-key 41. Therefore, the operator again maintains the engine speed at an appropriate speed, and the high pressure display 34 or the low pressure display. 36 can be confirmed, and depending on the situation, the + key 40 or the-key 41 can be operated as many times as necessary to finely adjust the proper filling amount.
[0039]
In addition, this device has a function to perform only additional filling so that it can be used even when the customer only wishes to fill chlorofluorocarbons instead of recycling. Filling is performed until the pressure reaches an appropriate pressure while measuring the pressure. In this case, since the operation of omitting the reproduction of the circulation reproduction course is performed, refer to the explanation of the circulation reproduction course for the explanation.
[0040]
【The invention's effect】
Since the apparatus of the present invention is configured as described above, in an air conditioning system in which the specified filling amount of Freon is not known, if the engine is maintained at an appropriate rotation speed, it follows the specified pressure corresponding to the outside air temperature at that time. When the specified filling amount is known, the regeneration and filling can be performed based on the filling amount. Therefore, the device can be applied to any vehicle.
In addition, it is possible to deal with customers who do not have much time in spite of the specified filling amount.
In addition, the pipe can be used in common regardless of whether pressure or weight is used for regeneration and filling, so that the apparatus can be reduced in size and manufactured at low cost.
Moreover, since the indicator which can confirm the rotation speed of an engine is provided, an exact fluorocarbon filling can be performed.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of an operation unit of the apparatus.
FIG. 3 is a block diagram of the apparatus.
FIG. 4 is a flowchart showing a course that can be executed by the apparatus;
FIG. 5 is a flowchart for explaining a circulation reproduction course of the apparatus.
FIG. 6 is an explanatory diagram showing the flow of chlorofluorocarbon during reproduction in the circulation reproduction course of the same device.
FIG. 7 is an explanatory diagram showing a flow of oil injection in a circulation regeneration course of the apparatus.
FIG. 8 is an explanatory diagram showing the flow of chlorofluorocarbon during collection in the circulation regeneration course of the same device.
FIG. 9 is an explanatory diagram showing the flow of chlorofluorocarbon during additional filling in the circulation regeneration course of the apparatus.
FIG. 10 is an explanatory diagram showing the flow of chlorofluorocarbon at the time of replenishment in the circulation regeneration course of the same device.
FIG. 11 is an explanatory diagram showing the flow of chlorofluorocarbon when collecting residual chlorofluorocarbon in the pipe line of the apparatus.
FIG. 12 is a flowchart for explaining a vacuuming regeneration course of the apparatus.
FIG. 13 is an explanatory diagram showing the flow of chlorofluorocarbon during vacuuming regeneration in the vacuuming regeneration course of the same device.
FIG. 14 is an explanatory diagram showing the flow of chlorofluorocarbon during filling in the evacuation regeneration course of the apparatus.
[Explanation of symbols]
2, 3 coupler
4, 5 hose
8 Pressure sensor for high pressure
9 Filter dryer
10 Evaporator
11 Low pressure sensor
12 Service can mounting
16 Compressor
17 Capacitor
18 tanks
20 load cells
21 to 26 Solenoid valve
35 Engine speed indicator
37 Circular playback key
39 Vacuum regeneration key
40 + key
41-key
46 Control means
47 Engine speed detection means
48 Outside air temperature sensor
50 Air conditioning system

Claims (6)

High pressure and low pressure hoses connected to the high and low pressure service valves provided in the vehicle air conditioning system, high pressure and low pressure sensors that detect the high and low pressures of the vehicle air conditioning system, and moisture and impurities from chlorofluorocarbons A filter dryer that removes liquefied chlorofluorocarbon, an evaporator, a compressor, a condenser that condenses liquefied chlorofluorocarbon, a tank that stores liquefied chlorofluorocarbon, a measuring means that measures the tank, and a line switch For vehicle, comprising: means for detecting the engine speed of the vehicle; an outside air temperature sensor; a preset means for presetting a specified amount of chlorofluorocarbon in the air conditioning system; and a control means for driving, stopping, and switching the devices. A CFC regeneration processing device in an air conditioning system,
While the vehicle engine and the air conditioning system are in operation, the liquefied chlorofluorocarbon in the air conditioning system introduced from the high pressure service valve is filtered and removed by the filter dryer, and the evaporator is depressurized and vaporized to reduce the low pressure. After continuing the cycle of returning from the service valve to the air conditioning system for a predetermined time, the high pressure side chlorofluorocarbon pressure in the air conditioning system is adjusted to the specified pressure corresponding to the predetermined engine speed and outside air temperature from the low pressure service valve. A circulation regeneration process for replenishing the air conditioning system or collecting the chlorofluorocarbon in the air conditioning system into the tank from a high-pressure service valve;
With the vehicle engine and air conditioning system stopped, the compressor is driven to evacuate until the pressure of the air conditioning system falls below a predetermined pressure, and liquefied and vaporized fluorocarbons introduced from the high and low pressure service valves Is filtered and dewatered by the filter dryer, depressurized and vaporized by the evaporator, sucked to the suction side of the compressor, and vaporized flon discharged from the discharge side is condensed and liquefied by the condenser and stored in the tank. Once stored, when the liquefied CFC in the tank is returned to the negative pressure air conditioning system, a decrease amount of the liquefied CFC in the tank measured by the measuring means is preset by the preset means. The vacuum regeneration process that ends filling when the value is reached,
A chlorofluorocarbon regeneration processing apparatus in a vehicle air conditioning system, wherein any one of the processes can be selectively executed. A service can attached with a liquefied chlorofluorocarbon containing service can, and when the liquefied chlorofluorocarbon in the tank falls below a predetermined value during the circulation regeneration process, the service can be temporarily suspended and attached to the mount. The tank is replenished with liquefied chlorofluorocarbon, and in the evacuation regeneration process, when the preset value is larger than the amount of liquefied chlorofluorocarbon stored in the tank, the evacuation is completed. 2. The chlorofluorocarbon regenerating apparatus in a vehicle air conditioning system according to claim 1, wherein liquefied chlorofluorocarbon is replenished into the tank from a service can attached to the mounting portion. 3. The vehicle air conditioning system according to claim 1, further comprising an indicator that receives an output of the engine speed detection means and displays whether the engine speed is maintained at a predetermined engine speed during the circulation regeneration processing step. Chlorofluorocarbon regeneration processing equipment. 4. The replenishment process according to claim 1, wherein, in the circulation regeneration processing step, when the Freon in the tank is replenished into the air conditioning system from the low-pressure service valve, the replenishment is intermittently performed. 5. A chlorofluorocarbon regeneration processing device in an air conditioning system for vehicles. In the intermittent replenishment, replenishment is interrupted when the low-pressure side pressure becomes a first predetermined pressure higher than a specified pressure, and then replenished when a second predetermined pressure higher than the specified pressure but lower than the first predetermined pressure is resumed. 5. The chlorofluorocarbon regeneration processing apparatus in a vehicle air conditioning system according to claim 4, wherein the cycle is repeated. 6. The vehicle air conditioning system according to claim 1, further comprising: a fine adjustment unit that finely adjusts a chlorofluorocarbon filling amount after completion of the circulation regeneration processing step and the evacuation regeneration processing step. Inside Freon regeneration processing equipment.

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