Introduction and research on FT-1000A refrigerant filling and recycling machine

This is a device that combines functions of recycling, regeneration, vacuuming, filling, and refueling to achieve multi-purpose use. The utility model has the advantages that the corresponding operation key is simple and easy to understand, the pipeline connection is simple and convenient, the electronic weighing is automatically charged, the high-efficiency purification filter is used to restore and regenerate the old refrigerant, and the like. The following functions can be realized: automatic recovery of refrigerant, refrigerant recovery and automatic removal of moisture, acid and impurities in the old refrigerant, automatic vacuuming, automatic charging of refrigerant, elimination of waste refrigeration oil and replenishment of air conditioning system Frozen oil. The device can efficiently recycle and reuse refrigerant. In the test, the recovery rate was 6 g/s (gaseous), 12 g/s (liquid), and the recovery amount was over 95%. Refrigerant charge reduction R12 charge and change of R12 in maintenance are also a good way to reduce R12 consumption and emissions <6>. In the test, by using FT-1000A refrigerant refilling machine Quantitative filling and the use of a leak-proof filling tool with a check valve to reduce the refrigerant charge, the filling rate is 1.6g / s, the charging accuracy is ± 10g, at the same time, improve the repair service Quality and maintenance level are important links to reduce refrigerant consumption. Therefore, automotive air conditioning maintenance personnel must undergo strict professional training before they can be employed. The refrigeration system for improving the sealing of automobile air conditioners generally consists of a compressor, a condenser, a liquid reservoir, an expansion valve, and an evaporator. In order to improve the sealing performance, the specific method is as follows: First, the leak detection method of the air conditioning system is performed by using a fluorescent leak detection method. When in use, it is only necessary to add the fluorescer to the system in a certain proportion. After the system is operated for 21 minutes, special glasses are worn, and the outside of the system is irradiated with the leak detector lamp, and the leak will be yellow fluorescent. Fluorescent leak detection is simple, accurate, fast, clean and safe. In the test, the new “Hongshi” black light produced by Wenzhou Hongshi Technology was used to conduct comprehensive leak detection and related maintenance. Second, in the case of ensuring that the system is not leaking, the following methods are adopted to improve the sealing of the system:

(1) Change the compressor shaft seal form. Because the automotive air-conditioning compressor adopts an open structure, the main shaft protrudes out of the compressor body, so it is necessary to install a sealing device at this part. In the experiment, the multi-lip seal type shaft seal developed by Nippon Denso Co., Ltd. is a sealing method that is better than the mechanical seal type shaft seal. (2) All hard joints are sealed with O-rings, and a cylindrical radial seal structure is used in the experiment. (3) The plate type quick joint is used for the connection between the pipe and the compressor, and the fast filling type connector is used for the filling valve. At present, R134a is recognized as the preferred replacement for automotive air conditioners. Through the analysis of some experimental performance parameters of R12 and R134a, the saturated steam heat transfer coefficient of HFC134a is 32% higher than that of CFC12 under the same mass flow rate; the thermal conductivity of saturated liquid is about 16% higher than that of CFC12. This shows that with equal cooling capacity or heat release, R134a can reduce the heat exchange area compared to R12. In addition, HFC134a has good atmospheric environment characteristics, ozone depletion potential (ODP) is zero, and global warming potential (GWP=1600) is much lower than R12's global warming potential (GWP=10600).