Control method of electronic expansion valve of air conditioner

An electronic expansion valve and control method technology, applied in heating and ventilation control systems, refrigerators, heating methods, etc., can solve the problems of increasing the maintenance probability of air conditioners, shortening the service life of capacitors, etc., to achieve reliable design solutions and reduce start-up The effect of reducing resistance and inrush current values

Inactive Publication Date: 2014-12-10

WUHU MATY AIR CONDITIONING EQUIP CO LTD

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Problems solved by technology

[0003] When the compressor of the fixed-frequency air-conditioning system is started, it needs to provide a large current value after the capacitor is stored to generate a large torque to drive the compressor rotor to overcome t...

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Method used

Contrast accompanying drawing below, by description to embodiment, the specific embodiment of the present invention is described in further detail, to help those skilled in the art have more complete, accurate and deep understanding to inventive concept of the present invention, technical scheme understand.

The present invention provides a kind of air conditioner electronic...

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Abstract

The invention discloses a control method of an electronic expansion valve of an air conditioner. The maximum opening of the electronic expansion valve is 480 pulses. The control method comprises the steps that after a starting instruction is received, a control system of the air conditioner opens the electronic expansion valve to the maximum opening or to more than 70% of the maximum opening, and then a compressor is started; after the compressor is started and operates for a period of time till operating stably, the opening of the electronic expansion valve is adjusted to the target operating opening; an air conditioner system operates normally; when a shutting-down instruction is received, the control system of the air conditioner opens the electronic expansion valve completely. According to the technical scheme, due to the fact that the electronic expansion valve is completely opened in the starting process, the coolant pressure difference between the two ends of a system throttling device can be reduced, the starting resistance of the compressor can be reduced, and the starting current can be reduced. The service life of system elements can be prolonged. A small-capacitance capacitor can be used, and therefore the system cost can be lowered, and impact on a power grid and other household appliances can be reduced.

Application Domain

Space heating and ventilation safety systemsSpace heating and ventilation control systems +1

Technology Topic

System elementCapacitance +6

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Examples

Experimental program(1)

Example Embodiment

[0017] With reference to the accompanying drawings, the specific implementation of the present invention will be further described in detail through the description of the embodiments to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0018] The invention provides a control method for an electronic expansion valve of an air conditioner. The electronic expansion valve is used as the main throttling device of the air conditioner system. The opening of the electronic expansion valve is fully opened when the system is turned on to reduce the refrigerant pressure difference between the two ends of the system throttling device. , To reduce the starting resistance of the compressor, thereby reducing the starting current.

[0019] Such as figure 1 The control process of the present invention is shown. In the picture:

[0020] t 1 Indicates the time from the initial state to the fully opened state of the electronic expansion valve;

[0021] t 2 Indicates the time when the compressor is running smoothly;

[0022] t 3 Indicates that the electronic expansion valve has reached the target operating opening and the system is operating normally;

[0023] t 4 Indicates the time when the electronic expansion valve is fully opened after the system receives the shutdown command.

[0024] The technical scheme adopted by the present invention is:

[0025] Such as figure 1 In the air conditioner electronic expansion valve control method shown, the maximum opening of the electronic expansion valve is 480 pulses, and the specific control process is as follows:

[0026] Step 1: When the time is 0s, the start command is received, and the electronic expansion valve passes t 1 Time (12s) to open to 480 pulses;

[0027] Step 2: Compressor start operation 2 A stable operation state is reached after time (4s);

[0028] Step 3: The electronic expansion valve reaches the target opening of 220 pulses, at t 3 Maintain normal operation during the time;

[0029] Step 4: After receiving the shutdown command, the electronic expansion valve is fully opened to 480 pulses.

[0030] The analysis of the above process and the specific parameters of its control are as follows:

[0031] After receiving the start-up command, the control system of the air conditioner opens the electronic expansion valve to the maximum opening or opens the electronic expansion valve more than 70%, and the time is t 1 , T 1 It is 12s; then the compressor is started; the reason is that most of the electronic expansion valves have a relatively accurate flow control range between 20 and 70%.

[0032] At present, the Sanhua brand electronic expansion valve, the mainstream product on the market, has a maximum opening of 480 pulses, and can open above 330 pulses or directly open to 480 pulses.

[0033] Overcoming the reduction of the starting torque and reducing the current through the related components of the system helps to improve the service life of the system components. If the design scheme is reliable, smaller capacity capacitors can be used, and the system cost can also be reduced. At the same time, the impact current value of the home grid-connected system when the air conditioner is started is reduced, reducing the impact on the grid and other home appliances.

[0034] Compressor starts and runs for a period of time t 2 , Until the compressor runs smoothly; t 2 4~10s; after waiting for the compressor to start and run smoothly (the time from compressor start to stable operation, the laboratory test can reach ≤4s, in order to ensure reliable operation, the stable time of running compressor is set to ≤10s), the electronic The expansion valve opening is adjusted to the target operating opening.

[0035] The target operating opening of the electronic expansion valve is 220 pulses. In this state, the air conditioner system operates normally.

[0036] The electronic expansion valve has reached the target operating opening, and the normal operation time of the air conditioner system is t3;

[0037] When receiving the shutdown command, the time after the control system of the air conditioner fully opens the electronic expansion valve is t4. Under normal circumstances, t4 will definitely meet the requirements within 3 minutes.

[0038] When the air conditioner receives a shutdown command, the electronic expansion valve is fully opened, which helps to balance the high and low pressure difference of the compressor, and also helps the next start.

[0039] Take the HK-KF26GW/N1Y-12F1(C3)-(A)[N] split set of split outdoor unit system using Guangdong Meizhi ASM106V1VDZ compressor system as an example to illustrate:

[0040] When the electronic expansion valve is used to operate the 220-pulse compressor with a target opening degree, the instantaneous peak value of the current when starting is 17.85A, and the instantaneous peak value of the starting current of the compressor with a 480-pulse degree opening is 15.03A. 1P small systems can generally reduce 2 to 4A, and large systems above 3P can reduce 8A or more, because compressors with large displacement require large starting torque.

[0041] The present invention has been exemplarily described above in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited by the above methods, as long as the method concept and technical solution of the present invention are used for various insubstantial improvements or without improvements Any application of the concept and technical solution of the present invention directly to other occasions falls within the protection scope of the present invention.

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Classification and recommendation of technical efficacy words

Small starting current
Low starting resistance

Control method of electronic expansion valve of air conditioner

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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