Frequency reduction control method and device for variable frequency compressor

The technology of a frequency conversion compressor and a control method, which is applied in the field of frequency conversion compressors, can solve the problems of the frequency conversion compressor being easy to lose steps, and achieve the effect of not easily losing steps.

Active Publication Date: 2018-04-06
NINGBO AUX ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a frequency reduction control method for a frequency conversion compressor to solve the problem that the frequency conversion compressor is easy to lose synchronization when the frequency conversion is performed in a low frequency operation state

Method used

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  • Frequency reduction control method and device for variable frequency compressor
  • Frequency reduction control method and device for variable frequency compressor
  • Frequency reduction control method and device for variable frequency compressor

Examples

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no. 1 example

[0030] see figure 1 , figure 1 Shows the flow chart of the variable frequency compressor frequency reduction control method provided by the embodiment of the present invention, the following figure 1 The specific process shown will be described in detail.

[0031] Step S101, controlling the frequency of the variable frequency compressor to decrease at a first preset speed.

[0032] In the state of low frequency, it is necessary to reduce the frequency of the inverter compressor according to the actual situation. For example, the inverter compressor is connected to 4 indoor units. When one indoor unit is turned off, the operating frequency of the inverter compressor needs to be reduced to match the operation of the other three indoor units.

[0033] Since the required frequency of the inverter compressor is stored in the controller and pre-stored when the three indoor units are working, after turning off one indoor unit, the controller will control the inverter compressor to...

no. 2 example

[0060] see image 3 , which is provided by the preferred embodiment of the present invention figure 1 The schematic diagram of the functional units of the inverter compressor down-frequency control device 100 is shown. It should be noted that the basic principles and technical effects of the inverter compressor down-frequency control device 100 provided in this embodiment are the same as those of the above-mentioned embodiments. Refer to the corresponding content in the above-mentioned embodiments. The variable frequency compressor frequency reduction control device 100 includes a frequency reduction control unit 110, a judgment unit 120, a phase current acquisition unit 130, a phase current comparison unit 140, a frequency reduction speed adjustment unit 150, and a frequency reduction stop unit 160.

[0061] The frequency reduction control unit 110 is configured to control the frequency of the frequency conversion compressor to decrease at a first preset speed.

[0062] It...

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Abstract

The invention provides a frequency reduction control method and a device for a variable frequency compressor, and relates to the technical field of variable frequency compressors, in particular to thefrequency reduction control method and the device for the variable frequency compressor. The method comprises the following steps that the variable frequency compressor is controlled to perform frequency reduction at a first preset speed, and when the frequency of the variable frequency compressor is reduced to a preset staying frequency, the magnitude of the phase current and the preset currentis compared, and the frequency reduction speed of the variable frequency compressor is controlled according to the comparison result. A staying frequency is preset in the frequency reduction process of the variable frequency compressor, and when the frequency of the variable-frequency compressor is reduced to the staying frequency, the frequency of the variable frequency compressor can keep the frequency for a period of time so as to realize the detection of the phase current at the moment, and meanwhile, the result is compared according to the comparison result of the phase current and the preset current. The variable frequency compressor is controlled to carry out frequency reduction at a preset speed, so that in the frequency reduction process, the actual phase current of the variable frequency compressor is closer to the preset phase current of the system, and the situation of loss of synchronism doesn't easily occur is avoided.

Description

technical field [0001] The present invention relates to the technical field of variable frequency compressors, in particular to a frequency reduction control method and device for variable frequency compressors. Background technique [0002] The frequency conversion compressor is mainly to adjust the speed of the compressor. By detecting the load of the frequency conversion compressor, or the number of indoor units, and the detection of the ambient temperature, the speed of the speed of the frequency conversion compressor is adjusted. When the load of the variable frequency compressor is light, or when the current temperature is close to the set target temperature, the speed of the variable frequency compressor will slow down, so that the cooling and heat output by the variable frequency compressor will be reduced; this will serve the purpose of energy regulation. The low frequency of the variable frequency compressor can realize precise control temperature and power saving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/86F24F11/64F24F11/61
CPCF25B2600/021F25B2600/0253
Inventor 侯丽峰赵攀秦宪吴锦平
Owner NINGBO AUX ELECTRIC
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