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An air conditioning system and an economizer electronic expansion valve control method

An electronic expansion valve and control method technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the superposition of vibrations of the heating main expansion valve and the economizer expansion valve, the expansion valve control is difficult to stabilize, and the PID parameters Poor adaptability and other problems, to achieve the effect of control stability, preventing shock superposition, and improving adaptability

Active Publication Date: 2020-06-23
四川长虹空调有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the control of the electronic expansion valve, most of the existing technologies use superheat and exhaust superheat to carry out PID control. If the economizer also uses superheat or exhaust superheat as the control target, it will easily lead to Coupling with the economizer expansion valve produces shock superposition, which makes the control of the expansion valve difficult to stabilize, and the PID parameters are poorly adaptable to multiple working conditions

Method used

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  • An air conditioning system and an economizer electronic expansion valve control method
  • An air conditioning system and an economizer electronic expansion valve control method
  • An air conditioning system and an economizer electronic expansion valve control method

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Embodiment 1

[0041] an air conditioning system such as figure 1As shown, it includes compressor 101, outdoor heat exchanger 104, use-side heat exchanger 109, economizer 106, four-way valve 103, economizer electronic expansion valve 105, heating main electronic expansion valve 107 and cooling main electronic expansion valve 108, the D port of the four-way valve 103 is connected to the exhaust port of the compressor 101, the C port is connected to the outdoor heat exchanger 104, the E port is connected to the use-side heat exchanger 109, and the S port The gas-liquid separator 102 is connected to the compressor 101; the port 2 of the economizer 106 is connected to the use-side heat exchanger 109 through the refrigeration main electronic expansion valve 108, and the port 4 of the economizer 106 is connected to the compressor 101 connection, the port 1 of the economizer 106 is divided into two routes, A and B, the route A is connected to the outdoor heat exchanger 104 through the heating main ...

Embodiment 2

[0045] A method for controlling an economizer electronic expansion valve, comprising the air conditioning system described in Embodiment 1, specifically comprising the following steps:

[0046] S1: The outdoor ambient temperature T is measured by the outdoor temperature sensor 室外 , according to the water outlet temperature T at the use side measured by the water outlet temperature sensor on the use side 出水 , according to the temperature T after the electronic expansion valve of the economizer measured by the temperature sensor after the electronic expansion valve of the economizer in , according to the compressor speed measured by the compressor speed sensor.

[0047] S2: According to the outdoor ambient temperature T measured in S1 室外 , the outlet water temperature T of the use side 出水 And the compressor rotational speed data utilizes the empirical formula to determine the control target temperature T 目标 .

[0048] S3: Temperature T after the electronic expansion valve a...

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Abstract

The invention discloses an air conditioning system and an economizer electronic expansion valve control method, including a compressor, an outdoor heat exchanger, a use-side heat exchanger, an economizer, a four-way valve, an economizer electronic expansion valve, and a control unit and The water outlet temperature sensor on the use side, the outdoor temperature sensor, the temperature sensor after the electronic expansion valve of the economizer, and the compressor speed sensor are respectively connected to the control unit. The present invention controls the opening of the economizer electronic expansion valve by collecting the water outlet temperature on the use side, the outdoor temperature, the temperature after the electronic expansion valve of the economizer, and the rotational speed of the compressor, and adopts a two-dimensional fuzzy controller, thus getting rid of the excessive control in the prior art. heat dependence. The invention does not depend on the degree of superheat, can stabilize the control of the expansion valve of the economizer, can effectively improve the low-temperature heating capacity, significantly improve the energy efficiency ratio, and improve the adaptability to multiple working conditions.

Description

technical field [0001] The invention belongs to the technical field of low-temperature heat pumps, and in particular relates to an air-conditioning system and an economizer electronic expansion valve control method. Background technique [0002] Low ambient temperature heat pump (chilled water) units have been used more and more in the north. The nominal working condition is -12°C outside ambient temperature, the minimum working condition requires the operation at -25°C outside ambient temperature, and the low temperature working condition is outside ambient temperature -20°C. Low ambient temperature causes a drastic attenuation of the heating capacity and energy efficiency of the system. In order to improve the heating capacity and energy efficiency at low temperature, the air conditioning system mostly adopts steam-injection enthalpy compressors. The principle is that in front of the economizer, the refrigerant is divided into A and B paths, of which A path is throttled a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B13/00F25B41/04F25B41/06F25B49/02F25B41/20F25B41/34
CPCF25B13/00F25B49/02F25B41/40F25B41/20F25B41/31Y02B30/70
Inventor 徐强
Owner 四川长虹空调有限公司