A mode switching method of frequency conversion heat pump

A technology of mode switching and heating mode, applied in the field of frequency conversion control, can solve the problems of shortening the service life of the compressor, difficult to maintain stable inlet water temperature, affecting the stable operation of the system, etc. Avoid the effect of shutdown

Active Publication Date: 2017-11-14
GUANGDONG PHNIX ECO ENERGY SOLUTION
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AI Technical Summary

Problems solved by technology

[0003] 1. After the system is shut down at a constant temperature and then re-heating / cooling, it is difficult to maintain a stable inlet water temperature, which affects the user's comfort;
[0004] 2. It will cause the compressor to stop and start frequently, which not only affects the stable operation of the system, but also shortens the service life of the compressor

Method used

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  • A mode switching method of frequency conversion heat pump
  • A mode switching method of frequency conversion heat pump
  • A mode switching method of frequency conversion heat pump

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Embodiment Construction

[0020] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0021] refer to figure 1 , a mode switching method of a variable frequency heat pump, comprising the following steps:

[0022] A. When the heat pump unit starts to work, calculate the difference between the inlet water temperature and the target temperature, and control the working mode as cooling or heating mode according to the difference;

[0023] B. The inlet water temperature is detected by the temperature sensor;

[0024] C. When it is detected that the inlet water temperature reaches the target temperature, control the working frequency of the unit to the lowest working frequency and continue to run in the current working mode;

[0025] D. When the unit continues to run at the lowest operating frequency and detects that the difference between the inlet water temperature and the target temperature is 0.5-1°C, control the unit to switch the...

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Abstract

The invention discloses a mode switching method for a variable frequency heat pump. The method comprises the following steps of controlling a default working mode according to a difference between water inlet temperature and target temperature; when the water inlet temperature is detected to reach the target temperature, controlling the working frequency of a unit to be minimum working frequency; when the difference between the water inlet temperature and the target temperature is detected to be 0.5 to 1 DEG C, switching the working mode. According to the method, the mode of the variable frequency heat pump is switched, so that water inlet temperature fluctuation caused by the restarting of the unit after constant temperature stopping is avoided, a compressor is kept running in such a process, frequent stopping and starting is avoided, and system stability and the service life of the compressor are ensured; in addition, a four-way valve is switched at the minimum working frequency, so that current shock caused by the switching of the four-way valve at high frequency is avoided, the service life of the four-way valve is prolonged, and the system stability is further improved; the mode switching method for the variable frequency heat pump can be widely applied to the field of variable frequency control.

Description

technical field [0001] The invention relates to the field of frequency conversion control, in particular to a mode switching method of a frequency conversion heat pump. Background technique [0002] In the past, when the frequency conversion heat pump is heating / cooling, when the inlet water temperature reaches the target temperature, the heat pump system will keep running at a low frequency and then stop at a constant temperature. However, such a frequency control method will have the following problems in the actual use process: [0003] 1. After the system is shut down at a constant temperature and then re-heating / cooling, it is difficult to maintain a stable inlet water temperature, which affects the user's comfort; [0004] 2. It will cause the compressor to stop and start frequently, which not only affects the stable operation of the system, but also shortens the service life of the compressor. Contents of the invention [0005] In order to solve the above-mentioned...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/02
CPCF25B49/022F25B2400/19F25B2500/06F25B2600/021
Inventor 吴洁云高翔刘远辉柳维
Owner GUANGDONG PHNIX ECO ENERGY SOLUTION
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