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Detection method of water shortage protection of constant-pressure variable-frequency water pump

A technology of water shortage protection and variable frequency water pumps, which is applied in the direction of non-variable pumps, pumps, pump control, etc., can solve the problems of low detection accuracy of water shortage protection and easy false alarms, so as to prolong the service life and reduce energy waste Effect

Active Publication Date: 2021-03-23
LEO GRP ZHEJIANG PUMP CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0013] In order to make up for the shortcomings of the existing technology and solve the problem of low detection accuracy and easy omission of the existing water shortage protection, the present invention proposes a detection method for constant pressure variable frequency water pump water shortage protection

Method used

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  • Detection method of water shortage protection of constant-pressure variable-frequency water pump
  • Detection method of water shortage protection of constant-pressure variable-frequency water pump
  • Detection method of water shortage protection of constant-pressure variable-frequency water pump

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Embodiment approach

[0039] As an embodiment of the present invention, after the controller enters the water shortage protection detection, and before disconnecting the power supply of the water pump, the controller detects the pressure of the water outlet 5 of the water pump through the pressure sensor; the controller completes the water outlet 5 of the water pump once every 2ms. Pressure detection; a judgment condition B is set in the controller; the judgment condition B is the pressure detection value P this time 1 and the last pressure detection value P 2 The absolute value of the difference between, that is, B=|P 1 -P 2 |; A counting condition T is set in the controller, and the initial value of the counting condition T is equal to 0; when the value of the judging condition B is equal to 0, the value of the counting condition is increased by 1, that is, when B=0, T= T+1; when the value of the counting condition T is equal to 10, the controller judges that the pressure of the water outlet 5 ...

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Abstract

The invention belongs to the technical field of water shortage protection of constant-pressure variable-frequency water pump, in particular to a detection method of water shortage protection of a constant-pressure variable-frequency water pump. The method comprises the following steps: setting maximum operation frequency S1 of the water pump in a controller of the water pump; setting triggering frequency A for triggering water shortage protection in the controller of the water pump; ensuring that the triggering frequency A is equal to the maximum operation frequency S1-2Hz, i.e., A is equal toS1 -2; currently controlling the operation frequency for operation of a driving motor of the water pump to be set as S2 through the controller, triggering a controller detection mechanism when S2 ismore than or equal to A, and entering a water-shortage protection detection state; and ensuring that the controller has no actions when S2 is less than A and the water pump keeps the operation state invariable. The detection method of water shortage protection of the constant-pressure variable-frequency water pump disclosed by the invention is low in detection cost, high in reliability and quick in response.

Description

technical field [0001] The invention belongs to the technical field of water shortage protection of water pumps, in particular to a detection method for water shortage protection of constant pressure variable frequency water pumps. Background technique [0002] At present, domestic variable frequency water pumps and commercial variable frequency water pumps on the market are equipped with a dedicated controller to control the motor to drive the water pump, and use the pressure sensor as a signal feedback through the PID control algorithm to meet the user's constant pressure water demand. As one of the most commonly used and essential protection functions in pump applications, water shortage protection can automatically identify the water outage state and stop in time to prevent the pump from running dry and improve its life when the water is out of service. In the design of this function in the prior art, the following means are often used: [0003] ⒈ Detect the current run...

Claims

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Application Information

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IPC IPC(8): F04D13/06F04D15/00
CPCF04D13/06F04D15/0077F04D15/0088Y02A20/00
Inventor 莫世佳於海洋孙祥
Owner LEO GRP ZHEJIANG PUMP CO LTD
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