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A control method and system for an expansion valve of a heat pump unit

A technology of heat pump unit and control method, which is applied in the direction of refrigeration and liquefaction, refrigerators, refrigeration components, etc., can solve the problems of exceeding the evaporation temperature of the compressor, damage of the compressor, and high evaporation temperature, and achieve the effect of improving heat exchange efficiency

Active Publication Date: 2022-03-08
GUANGDONG NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the control of the traditional suction superheat degree, the basic control is the superheat degree of the refrigerant at the outlet of the evaporator. When the superheat degree at the outlet of the evaporator is 3°C-5°C, it can ensure that the compressor does not experience liquid compression, but When heating at a high ambient temperature, if the superheat is still controlled at 3°C-5°C, the evaporation temperature will be very high at this time, even exceeding the allowable operating evaporation temperature of the compressor. damage

Method used

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  • A control method and system for an expansion valve of a heat pump unit
  • A control method and system for an expansion valve of a heat pump unit
  • A control method and system for an expansion valve of a heat pump unit

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Embodiment 1

[0042] see figure 1 As shown, a method for controlling an expansion valve of a heat pump unit, the method includes the following steps:

[0043] S1: Obtain the current ambient temperature Tn, turn to S2;

[0044] S2: Judging whether Tn is less than or equal to the interval ambient temperature Ts, if the judgment result is yes, turn to S3, if the judgment result is no, turn to S4;

[0045] S3: The control of the expansion valve adopts the normal suction superheat control;

[0046] S4: The expansion valve is controlled by evaporation temperature control.

[0047] Preferably, the interval ambient temperature Ts is 35°C.

[0048] The control of the expansion valve adopts the normal suction superheat control and needs to determine the value of the control target superheat, the control target superheat = set target superheat + correction value S, preferably, the set target superheat is 1°C , the correction value S is obtained by looking up the superheat correction value S value ...

Embodiment 2

[0068] A control system for an expansion valve of a heat pump unit, the heat pump unit includes a controller, a compressor, an evaporator, an ambient temperature sensor, and an expansion valve, and the controller is connected to the compressor, the evaporator, the ambient temperature sensor, and the expansion valve respectively The ambient temperature sensor is used to measure the ambient temperature, the expansion valve is located on the pipeline of the refrigerant inlet of the compressor, and the evaporator is provided with an evaporation temperature sensor for measuring the vaporization of the refrigerant in the evaporator The control system includes an ambient temperature acquisition module, a control mode judgment module, an expansion valve superheat control module, and an expansion valve evaporation temperature control module, and the ambient temperature acquisition module is used to obtain the current ambient temperature; further, the The ambient temperature acquisition ...

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Abstract

The invention discloses a control method and system for an expansion valve of a heat pump unit, which comprises the following steps: obtaining the current ambient temperature Tn, judging whether Tn is less than or equal to the interval ambient temperature Ts, and if the judging result is yes, the expansion valve is controlled by normal suction Superheat control, the judgment result is no, the expansion valve is controlled by evaporation temperature control; the expansion valve is controlled by normal suction superheat control, and the value of the control target superheat needs to be determined, and the control target superheat = set target The degree of superheat + the correction value S, the correction value S is obtained by looking up the value table of the correction value S of the superheat; the control system is used to realize the above control method. Under normal working conditions, use superheat control to ensure that the compressor does not generate hydraulic pressure, and improve the heat exchange efficiency of the evaporator as much as possible. The compressor operates with the highest efficiency at the highest evaporating temperature allowed to operate.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to a control method and system for an expansion valve of a heat pump unit. Background technique [0002] At present, for units controlled by electronic expansion valves, the control strategy of electronic expansion valves generally adopts suction superheat control or exhaust superheat control. Hydraulic compression, thus protecting the compressor. [0003] For the control of the traditional suction superheat degree, the basic control is the superheat degree of the refrigerant at the outlet of the evaporator. When the superheat degree at the outlet of the evaporator is 3°C-5°C, it can ensure that the compressor does not experience liquid compression, but When heating at a high ambient temperature, if the superheat is still controlled at 3°C-5°C, the evaporation temperature will be very high at this time, even exceeding the allowable operating evaporation temperature of the compre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B49/02
CPCF25B49/02
Inventor 赵密升周晓丹钟惠安
Owner GUANGDONG NEW ENERGY TECH DEV