A self-cleaning photoelectric frost thickness sensor

Abstract

The invention discloses a self-cleaned photoelectric frost thickness sensor which comprises a gear motor, a motor fixing part, a connecting main body, a positioning light emitter, a positioning light receiver, a shaft sleeve, a brush, a frost testing light emitter, a frost testing light receiver, a heat conduction part, a sensor fixing part, a front cover plate, a rear cover plate and a top cover plate, wherein the gear motor is mounted on a side of the connecting main body through the motor fixing part; the brush is fixed on a motor shaft; the heat conduction part is embedded in a groove on the bottom side of the connecting main body; the top of the heat conduction part extends outside the lower surface of the inner side of the connecting main body; the frost testing light emitter and the frost testing light receiver are respectively arranged on two sides of the heat conduction part; the positioning light emitter and the positioning light receiver are respectively arranged at the top end of the connecting main body; the heat conduction part is connected with the sensor fixing part; the connecting main body is made of a power and thermal insulating material; the heat conduction part is made of a heat conduction material. The self-cleaned photoelectric frost thickness sensor has the beneficial effects that frost thickness of refrigeration devices such as an air source heat pump unit and a heat pump room air-conditioner can be stably and effectively directly measured, and the accident of 'mal-defrosting' of the refrigeration devices can be avoided.

Description

technical field [0001] The invention relates to a self-cleaning photoelectric frost thickness sensor, specifically, for air source heat pump units, heat pump room air conditioners and other refrigeration devices, using photoelectric conversion technology to monitor the thickness of the frost layer, and using a brush to sweep the frost The self-cleaning of the sensor is realized by means of the method, combined with the water-shielding measures of the top cover plate, the sensor itself is prevented from being waterproof, drained, and dirty. Background technique [0002] Frosting is a key issue that affects the heating performance and operating performance of refrigeration devices such as air source heat pump units and heat pump room air conditioners. The growth of the frost layer increases the heat transfer resistance of the heat exchanger, reduces the air flow, and must be defrosted. Existing defrosting control methods include: 1) timing defrosting control method; 2) temper...

AI Technical Summary

Problems solved by technology

The application of the photoelectric conversion principle to the monitoring of frost layer thickness has irreplaceable advantages, but the signal will fail due to waterproof, drainage, and dirty blockage problems, and the control stability cannot be guaranteed

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