Refrigerating agent filling and recovering system and refrigerating agent filling and recovering method for vehicle air conditioner test system

Abstract

The invention discloses a refrigerating agent filling and recovering system and a refrigerating agent filling and recovering method for a vehicle air conditioner test system. The refrigerating agent filling and recovering system comprises a liquid storage tank, a vacuum pump, a vacuum gauge, a first pipeline, a second pipeline, a filling tank, a recovering tank, a temperature control tank, a heater, a cooler, a weighing device and a control unit, wherein the filling tank which is arranged in a first temperature control box is connected with the liquid storage tank by virtue of a refrigerating agent replenishing valve and connected with the first pipeline by virtue of a filling valve; the recovering tank which is arranged in a second temperature control box is connected with a second pipeline by virtue of a recovering valve; the heater and the cooler are respectively used for controlling the temperature of the first temperature control box and the second temperature control box, and the two temperature control boxes are arranged on the weighing device; a low pressure pipeline and the second pipeline are respectively connected with the vacuum pump by virtue of a low-pressure vacuum valve and a high-pressure vacuum valve, a communication valve is arranged between the filling tank and the recovering tank, and one of the filling tank and the recovering tank is connected with the vacuum pump by virtue of a filling recovering vacuum valve; the control unit is connected with the weighing device, the heater, the cooler, the vacuum gauge and all valves. By adopting the system and the method, quantitative filling and temperature control can be accurately realized, and the reutilization of the refrigerating agent can be realized by switching the state of the temperature control boxes.

Description

technical field [0001] The invention relates to the technical field of air-conditioning and refrigeration, in particular to a refrigerant filling and recovery system and method for a vehicle air-conditioning test system. Background technique [0002] At present, in the filling and recycling field of automotive air-conditioning refrigerants, most of them use pump filling and compressor recovery. [0003] figure 1 It is a schematic diagram of a common device for filling refrigerant through a plunger pump, which includes a plunger pump 11, a vacuum pump 12, sensors (including a pressure sensor 13 and a vacuum sensor 14), a flow meter 15, a fluid control valve, etc., The whole process of vacuum quantitative filling of refrigerant mainly includes several process sequences of vacuuming, pressure maintaining and leak detection, secondary vacuuming, and filling. [0004] First, use the vacuum pump 12 to discharge the air in the automobile air conditioning system, and use the vacuu...

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Problems solved by technology

[0008] figure 2 The unit shown uses the compressor to recover the refrigerant, which not only increases the cost, but also if the compressor contains lubricating oil, it may also seep into the lubricating oil in the compressor

In addition, the liquid storage tank is placed in a normal temperature environment and does not have a temperature control function. When the external ambient temperature is low, the pressure in the liquid storage tank may be low, so that during the filling process, due to The pressure in the liquid storage tank is balanced with the pressure in the air conditioning system, which causes the problem that it cannot be filled normally

In addition, the filling accuracy of the device is low, generally ±5g

[0009] To sum up, the filling recovery device using a plunger pump or compressor has low filling accuracy, is difficult to control, and has high equipment costs. At the same time, the moving parts are easily damaged, which reduces the reliability of the system and generates relatively large noise.

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