Parallel double-system frequency conversion refrigerator with electronic expansion valve and control method of parallel double-system frequency conversion refrigerator

Abstract

The invention discloses a parallel-connection dual-system frequency conversion refrigerator with an electronic expansion valve and a control mode of the parallel-connection dual-system frequency conversion refrigerator. Comprising an inverter compressor and an electronic expansion valve. An outlet of the inverter compressor is connected with the condenser, an outlet of the condenser is connected with the capillary tube, and the capillary tube is connected with the electronic expansion valve in series. The electronic expansion valve outlet is connected with the electromagnetic three-way valve first interface; a third interface of the electromagnetic three-way valve is connected with the refrigerating chamber evaporator; the electromagnetic three-way valve is connected with the freezing evaporator; the refrigeration evaporator is connected with the freezing evaporator in parallel, the air return pipe is connected with the capillary tube to form a heat regenerator, and a temperature sensor is installed at an outlet of the heat regenerator on the air return pipe. By adopting the mode that the capillary tube and the electronic expansion valve are connected in series and matched, the adjusting sensitivity of the electronic expansion valve in the refrigerator is improved while the original heat regeneration mode of the refrigerator is not changed. The control modes comprise an electronic expansion valve and variable frequency compressor coupling control mode and a variable frequency fan control mode for the system.

Description

technical field [0001] The invention relates to the technical field of refrigerators, in particular to a parallel dual-system frequency conversion refrigerator with an electronic expansion valve and a control method thereof. Background technique [0002] With the development of refrigerators, variable frequency compressors and variable frequency fans have been widely used in refrigerator systems. However, current inverter refrigerators still mostly use capillary tubes as throttling mechanisms, but there is a problem that the throttling effect cannot be adjusted and cannot effectively match other inverter equipment. The electronic expansion valve with adjustable throttling effect is a good substitute for the capillary. [0003] At present, the traditional electronic expansion valve is mostly suitable for large and medium-sized refrigeration equipment such as air conditioners. The valve aperture is too large compared to the small cooling capacity of the refrigerator, so that ...

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Problems solved by technology

[0003] At present, the traditional electronic expansion valve is mostly suitable for large and medium-sized refrigeration equipment such as air conditioners. The valve aperture is too large compared with the small cooling capacity of the refrigerator, so that the direct replacement of the refrigerator capillary by the electronic expansion valve will cause the problem of poor adjustment sensitivity.

Moreover, using an electronic expansion valve to directly replace the capillary tube will change the heat recovery method of the traditional refrigerator, which requires a redesign of the refrigerator structure, which greatly increases the development cycle and cost

Moreover, the traditional electronic expansion valve mostly uses the superheat degree of the evaporator outlet as the control signal, but for the refrigerator, the superheat degree of the evaporator outlet is very small, or even no superheat degree.

Therefore, the traditional electronic expansion valve control method cannot be directly applied to refrigerators.

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