Hydrocarbon Refrigerant Emission and Low Explosive Limit Measuring Device for Household Appliances

Abstract

The invention discloses a device for measuring whether leaked hydrocarbon refrigerant reaches lower-explosive limit or not for home appliances. The device comprises a hydrocarbon refrigerant concentration measuring system, a refrigerant temperature and flow control system and a quality measuring system. The device is characterized by further comprising a box body temperature control system and an external thermal insulation layer, the influence of the hot-air convection to the quality measuring system can be reduced due to the design, the refrigerant temperature and flow control system adopts an external storage pipeline mechanism, the quality measuring system adopts a three-point weighing and measuring structure, and a concentration measuring sensor of the hydrocarbon refrigerant concentration measuring system is externally arranged; and the device is mainly used for the measuring whether the leaked hydrocarbon refrigerant reaches the lower-explosive limit or not for the refrigerator and the air conditioner, is controlled by a PLC (programmable logic controller), has the functions of refrigerant heating and releasing controlling, concentration measuring, and alarming when the leaked hydrocarbon refrigerant reaches the explosive limit, and has a first-stage alarm function and a second-stage alarm function when the leaked hydrocarbon refrigerant reaches the explosive limit.

Description

technical field [0001] The invention relates to a detection device for household electrical appliances, in particular to a method for detecting whether the concentration of hydrocarbon refrigerant leaked in household electrical appliances has reached its low explosion limit. Background technique [0002] In order to protect the environment, according to the 1987 Montreal Announcement, fluorine-containing refrigerants are gradually replaced by some low-harm and environmentally friendly refrigerants. Hydrocarbons and HFCs are the main research directions for alternative refrigerants. Hydrocarbon alternative refrigeration refrigerants mainly include: propane (R-290) and isobutane (R-600a). Propane and isobutane have low toxicity, good performance, no ODP value and low GWP value. Hydrocarbons are currently widely used in small household appliances, such as refrigerators, air conditioners and other refrigeration appliances, due to their natural environmental protection and excell...

AI Technical Summary

Problems solved by technology

[0004] At present, there is no uniform test method for the explosion limit of flammable refrigerants in the world. At present, the laboratory does not have a systematic measurement method. It only simulates and measures the leakage position of the refrigerant, and cannot accurately simulate the actual operating state of the refrigerant (including temperature and pressure conditions) and the accurate value of the low explosion limit of the flammable gas.

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