JPS6345654Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a refrigerant filling amount detection device that detects the amount of refrigerant filled when refrigerant is being filled into an air-conditioning system of a car, etc., and it recognizes the accurate filling amount and always ensures reliable filling work. It has been made possible.

Generally, in this type of filling equipment, the quality of filling is judged by reading the refrigerant pressure displayed on a compound gauge connected to the high pressure side and low pressure side of the compressor of the equipment to be filled. The appropriate filling pressure, which is the standard for knowing, varies greatly depending on the outside temperature at the time of filling, and it is necessary to measure the temperature and confirm the appropriate pressure each time. There were some drawbacks. Conventionally, it is known to measure the weight of the refrigerant can and determine whether the refrigerant is filled properly or not based on the weight of the refrigerant filled. skills were required.

This idea was created in response to the above points.
This will be explained in detail below with reference to embodiments shown in the figures.

Reference numeral 1 denotes a refrigerant filling device main body, which has hoses 4, which connect to service valves 3, 3' on the high-pressure side and low-pressure side provided in the compressor 2 of the cooling device, which is filled during work.
Connect 4'. Reference numerals 5 and 5' designate high-pressure side and low-pressure side pressure coupling gauges, which communicate with the high and low service valves 3 and 3', respectively, via conduits, and display the pressures on the high-pressure side and low-pressure side, respectively. Reference numeral 6 denotes a vacuum pump, which performs evacuation work to discharge air, water, etc. from the pipes of the cooling device and the filling device prior to filling. An evaporator 7 completely vaporizes the refrigerant to be filled, and a compressor 2 compresses the liquid refrigerant to prevent overload. Reference numerals 8, 9, and 10 are electromagnetic valves provided in the conduit of the main body 1, which are normally closed and opened during vacuum evacuation work.First, valves 8 and 9 are opened to remove older refrigerant from the connected cooling device. The air is discharged from the relief valve 11, and then the valve 10 is further opened and the vacuum pump 6 is driven to perform evacuation. Reference numeral 12 denotes a refrigerant filling amount detection device provided in the main body 1, and is connected to the evaporator 7 via a highly flexible refrigerant hose 13 made of a soft material such as rubber. A manifold 14 is provided in the detection device 12 and communicates with the hose 13, and is provided with a plurality of refrigerant can attachment ports 16 for attaching a plurality of refrigerant cans 15 upside down. Reference numeral 17 denotes a weight detection section located below the manifold 14, which has a weighing function such as a spring scale, and is provided with a manifold 14 that can be moved up and down by a flexible hose 13, and a refrigerant can attached to this manifold 14. 15 and has the function of detecting the weight and converting the weight into an electrical signal. Reference numeral 18 denotes a filling amount display section for displaying the weight detected in response to the signal given by the detection section 17, which includes a memory calculation circuit 20 and a display 18a, and functions as a filling amount detection means and a filling amount display means, respectively.
Before the start of filling, 0 is displayed on the display 18a, and as the filling is started and the refrigerant flows out from the refrigerant can 15, the memory calculation circuit 20 calculates the decrease in weight given by the weight detection section 17, and the display shows 18a displays the decreased amount as the refrigerant filling amount. Further, this display section 18 has a charging amount setting device 19, and if the operator sets an appropriate charging amount in this setting device 19 in advance, the refrigerant charging amount given by the memory calculation circuit 20 will match this set value. When the refrigerant temperature reaches or approaches the set value, the alarm 21 issues an alarm, and when the set value is reached or exceeds the set value, the solenoid valve 22 provided in the refrigerant outlet path is automatically closed. ing. In addition, FIG. 3 shows another embodiment in which the filling device main body 1 and the refrigerant filling amount detection device 12 are separated, so that it can be additionally attached to a filling device that is not equipped with the detection device 12. It can be used simply by switching and connecting the normally provided manifold 14' and the refrigerant path.

Here, to explain the operation and work of the device according to this invention, after connecting the filling device 1 and the compressor 2 of the cooling device via the connecting hoses 4, 4', first open the solenoid valves 8, 9 and open the cooling device. The old refrigerant inside is released from the relief valve 11, and then the solenoid valve 10 is opened and the vacuum pump 6 is driven to draw a vacuum, and then the solenoid valves 9 and 10 are closed and the solenoid valve 2 is
2 is opened and the refrigerant can 15 is filled with refrigerant. The filling operation may be performed while checking the filling amount displayed on the filling amount display section 18, and the filling may be interrupted when the appropriate filling amount for the cooling device is reached. Furthermore, if an appropriate filling amount is set in advance in the filling amount setting device 19, filling is automatically completed.

This invention is constructed as described above, and includes a manifold connected to a refrigerant pipe line of a refrigerant filling device and provided with a plurality of refrigerant can mounting ports, and a weight detection unit that detects the weight of the manifold and the refrigerant cans attached to the manifold. and a filling amount detecting means for calculating the weight that decreases as the refrigerant is filled based on a signal from the weight detecting section to obtain the filling amount, and a filling amount displaying means for displaying the filling amount given by the filling amount detecting means. So,
The refrigerant can be filled based on the refrigerant filling weight displayed on the display means, and compared to the conventional method of filling while checking the refrigerant pressure, there is no inconvenience such as the appropriate charging pressure fluctuating depending on the outside temperature, and it requires less skill. Refrigerant filling can be performed easily and without mistakes. In addition, since the amount of refrigerant filled can be accurately detected, the performance of the cooling device and the filling device can be easily confirmed by comparing the pressure displayed on a pressure compound gauge installed in a normal filling device. In other words, if the pressure indicated on the compound meter does not reach the proper pressure after filling the appropriate amount, it is assumed that there is a pipe leak in the cooling device or filling device, poor performance of the compressor, etc.; If the pressure is exceeded, it is assumed that air has entered the cooling device or filling device, or there is a defect in vacuuming. This allows you to easily identify malfunctions or work errors in each device, and ensure reliable filling at all times. Can do work.

[Brief explanation of the drawing]

Fig. 1 is an external view of an embodiment of this invention, Fig. 2 is an explanatory diagram of the configuration of the same embodiment, Fig. 3 is an explanatory diagram of the configuration of another embodiment, and Fig. 4 is a block diagram showing the control system of the embodiment. In the figure, 1 is a refrigerant filling device main body, 12 is a refrigerant filling amount detection device according to the present invention, 14 is a manifold, 1
Reference numeral 5 denotes a refrigerant can, 16 a refrigerant can attachment opening, 17 a weight detection section, 18 a filling amount display section, 18a a display serving as a filling amount display means, and 20 a storage/arithmetic circuit serving as a filling amount detection means.

Claims (1)

[Scope of utility model registration request] A manifold connected to a refrigerant pipe line of a refrigerant filling device and provided with a plurality of refrigerant can mounting ports, a weight detection section that detects the weight of the manifold and the refrigerant cans attached to the manifold, and a signal from the weight detection section. A refrigerant filling amount detection device comprising: a filling amount detecting means for calculating the weight that decreases with refrigerant filling based on the refrigerant filling amount and obtaining the filling amount; and a filling amount displaying means for displaying the filling amount given by the filling amount detecting means. Device.