Rime ice detection device, heat-pump air-conditioner and defrosting control method thereof

Abstract

A rime ice detection device of the invention comprises a light emitting device and a light receiving device; a heat-pump air-conditioner comprises a rime ice detection device installed on a circulation system, the rime ice detection device comprises a light emitting device and a light receiving device, the rime ice detection device is connected with a control component circuit, and converts a detected light signal into an electric signal to transmit the signal to a control component. The rime ice detection device uses the rime ice as barriers of a light beam channel, after shading and refracting the light beam and changing intensity of the light, an output signal of the light receiving device is changed. The rime ice detection device can be used for aspects, such as defrosting control of refrigerators, rime ice volume control and the like. The rime ice is detected by the rime ice detection device or dual-detection of a pipeline temperature sensor and the rime ice detection device. The defrosting control method of the heat-pump air-conditioner of the invention controls the rime ice detection device to detect the circulation system, so that frosting or not can be accurately judged, frost can be effective removed, and heating efficiency of the air-conditioner is improved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to a frost detection device, a heat pump air conditioner and a defrosting control method thereof. The invention relates to a defrosting method for a heat pump air conditioner, which can detect frosting on an outdoor heat exchanger and can start a defrosting operation in a heating working mode. Background technique [0002] The defrosting control of air conditioners in the prior art all uses temperature, pressure, wind speed, rotational speed and other sensors to detect frosting conditions indirectly for defrosting control. During the implementation process, due to the influence of the system and the environment and other factors, there is a big difference between the actual and the theoretical, or the defrosting is not complete, or the defrosting is in advance, which will reduce the heating efficiency of the heat pump. [0003] For example, in a traditional heat p...

AI Technical Summary

Problems solved by technology

In order to solve the above problems, many companies have proposed some defrosting modes, but they have not solved this problem well, such as the invention patent application CN1164006A disclosed in the Chinese Patent Gazette, the publication date was November 5, 1997, and the applicant was South Korea. LG Electronics Co., Ltd., the patent application discloses a defrosting method for a heat pump type air conditioner, including: for measuring the temperature difference between the indoor duct temperature TE1 and the room temperature TR1 after m1 minutes have elapsed since the heating operation start time The first temperature measuring step of TD1, the second temperature measuring step of TD2 for measuring the temperature difference TD2 between the indoor pipe temperature TE2 and the room temperature TR2 after m2 minutes has elapsed, and the second temperature measuring step for combining the first and second temperature measuring steps The individual temperatures measured in the comparison with the reference value and the defrost step for detection of frost build-up

The invention patent application starts the defrosting operation by relying on the indoor pipe temperature sensor and the indoor temperature sensor in the heating operation mode. After making the difference, make the difference again, and then compare it with a certain set value to determine the defrosting time. By setting different comparison values, the invention will get different set defrosting time periods, which changes the traditional The problem of the fixed time in the defrosting method has improved the accuracy of defrosting, but it still does not solve the problem of automatically adjusting the defrosting time of the heat pump air conditioner with the frosting on the outdoor heat exchanger.

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