Temperature adjustment device, control method therefor, control apparatus thereof, and storage medium

Patent metadata

Field	Value
Publication number	US-12467651-B2
Application number	US-202217992803-A
Country	US
Kind code	B2
Filing date	Nov 22, 2022
Priority date	Dec 8, 2020
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

A compressor return air dryness detection method includes: obtaining an exhaust air pressure, a return air pressure, a working frequency, an exhaust air temperature, and a return air temperature of a compressor; determining a return air saturation temperature corresponding to the return air pressure; calculating a temperature difference value based on the return air temperature and the return air saturation temperature; and in accordance with a determination that the temperature difference value is smaller than a predetermined threshold value, calculating a return air dryness of the compressor based on the exhaust air pressure, the return air pressure, the working frequency, and the exhaust air temperature.

First claim

What is claimed is:

1 . A compressor return air dryness detection method, comprising:
obtaining an exhaust air pressure of a compressor, a return air pressure of the compressor, a working frequency of the compressor, an exhaust air temperature of the compressor, and a return air temperature of the compressor; determining a return air saturation temperature corresponding to the return air pressure; calculating a temperature difference value based on the return air temperature and the return air saturation temperature; in accordance with a determination that the temperature difference value is smaller than a predetermined threshold value, calculating a return air dryness of the compressor based on the exhaust air pressure, the return air pressure, the working frequency, and the exhaust air temperature; in accordance with a determination that the temperature difference value is greater than or equal to the predetermined threshold value, determining a predetermined return air dryness as the return air dryness of the compressor; subsequent to the calculating, generating an adjustment strategy based on the return air dryness; and adjusting an operation state of the compressor based on the adjustment strategy, to control the return air dryness of the compressor within a predetermined return air dryness interval.

2 . The compressor return air dryness detection method according to claim 1 , wherein the calculating the return air dryness of the compressor based on the exhaust air pressure, the return air pressure, the working frequency, and the exhaust air temperature comprises:
determining an exhaust air enthalpy value based on the exhaust air pressure and the exhaust air temperature; calculating a compression ratio based on the exhaust air pressure and the return air pressure, and determining a theoretical enthalpy difference based on the compression ratio; determining an absolute thermal efficiency of the compressor based on the exhaust air pressure, the return air pressure, and the working frequency; and calculating the return air dryness of the compressor based on the exhaust air enthalpy value, the theoretical enthalpy difference, the absolute thermal efficiency of the compressor, and the return air pressure.

3 . The compressor return air dryness detection method according to claim 2 , wherein the calculating the return air dryness of the compressor based on the exhaust air enthalpy value, the theoretical enthalpy difference, the absolute thermal efficiency of the compressor, and the return air pressure comprises:
calculating a return air enthalpy value based on the exhaust air enthalpy value, the theoretical enthalpy difference, and the absolute thermal efficiency of the compressor; searching for a saturated liquid enthalpy value and a saturated air enthalpy value that correspond to the return air pressure; and calculating the return air dryness of the compressor based on the saturated liquid enthalpy value, the saturated air enthalpy value, and the return air enthalpy value.

4 . The compressor return air dryness detection method according to claim 3 , wherein the calculating the return air dryness of the compressor based on the saturated liquid enthalpy value, the saturated air enthalpy value, and the return air enthalpy value comprises:
calculating, based on the saturated liquid enthalpy value, the saturated air enthalpy value, and the return air enthalpy value, the return air dryness of the compressor in accordance with a predetermined return air dryness formula:
X =( Ht 7− Hpe _ liq )/( Hpe _gas− Hpe _ liq ),

where x represents the return air dryness of the compressor, Ht 7 represents the return air enthalpy value, Hpe_liq represents the saturated liquid enthalpy value, and Hpe_gas represents the saturated air enthalpy value.

5 . The compressor return air dryness detection method according to claim 1 , wherein the obtaining the exhaust air pressure, the return air pressure, the working frequency, the exhaust air temperature, and the return air temperature of the compressor comprises:
detecting the exhaust air pressure of the compressor by an exhaust air pressure sensor, and detecting the return air pressure of the compressor by a return air pressure sensor; detecting the exhaust air temperature of the compressor by an exhaust air temperature sensor, and detecting the return air temperature of the compressor by a return air temperature sensor; and obtaining a rotational speed of the compressor, and determining the working frequency of the compressor based on the rotational speed of the compressor.

6 . A compressor return air dryness detection device, comprising:
a memory; a processor; and a compressor return air dryness detection program stored on the memory and executable on the processor, the compressor return air dryness detection program comprising instructions that, when executed by the processor, cause the processor to perform operations of the compressor return air dryness detection method according to claim 1 .

7 . A non-transitory computer-readable storage medium, storing a compressor return air dryness detection computer program, when executed by a processor, cause the processor to perform operations comprising: obtaining an exhaust air pressure, a return air pressure, a working frequency, an exhaust air temperature, and a return air temperature of a compressor;
determining a return air saturation temperature corresponding to the return air pressure; calculating a temperature difference value based on the return air temperature and the return air saturation temperature; in accordance with a determination that the temperature difference value is smaller than a predetermined threshold value, calculating a return air dryness of the compressor based on the exhaust air pressure, the return air pressure, the working frequency, and the exhaust air temperature; subsequent to calculating, generating an adjustment strategy based on the return air dryness; and adjusting an operation state of the compressor based on the adjustment strategy, to control the return air dryness of the compressor within a predetermined return air dryness interval.

Assignees

• Gd Midea Heating & Ventilating Equipment Co Ltd
• Midea Group Co Ltd

Inventors

• Zheng Chunyuan
• Luo Bin
• Ding Yunxiao
• Li Dongdong
• Guo Fangcheng
• Li Bin
• Wu Jintong

Classifications

• F24F11/83

  by controlling the supply of heat-exchange fluids to heat-exchangers · CPC title

• F24F11/80 Primary

  for controlling the temperature of the supplied air · CPC title

• G05B2219/2614

  HVAC, heating, ventillation, climate control · CPC title

• F24F2140/50

  Load · CPC title

• Y02B30/70

  Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating · CPC title