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Frequency conversion constant-pressure water supply system and control method thereof

A technology of water supply system, frequency conversion and constant pressure, which is applied in the configuration of water supply devices, water supply pools, buildings, etc. It can solve problems such as height increase, inability to realize constant pressure water supply, and decrease of pump outlet pressure, so as to achieve high control accuracy and avoid water pump corrosion , the effect of preventing idling

Inactive Publication Date: 2011-07-06
SHANGHAI EAST PUMP(GRP) CO LTD
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Problems solved by technology

[0005] Therefore, when the characteristic curve of the pipeline system changes, the working condition of the pump changes accordingly, and the head of the pump decreases or increases correspondingly with the increase or decrease of the flow rate, resulting in a decrease or increase of the outlet pressure of the pump, and constant pressure cannot be achieved. water supply

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  • Frequency conversion constant-pressure water supply system and control method thereof
  • Frequency conversion constant-pressure water supply system and control method thereof

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Embodiment Construction

[0030] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0031] The frequency conversion constant pressure water supply system provided by the present invention uses frequency conversion to adjust the speed of various pumps in the domestic water supply system, so that one frequency converter can control multiple water pumps at the same time, realize automatic constant pressure water supply, and can be equipped with a small pump to run at night and fire protection function.

[0032] The synchronous speed expression of the AC motor in the existing domestic water supply system:

[0033] n=60f(1-s) / p(1)

[0034] In the formula, the speed of n-asynchronous motor;

[0035] f - the frequency of the asynchronous motor;

[0036] s-motor slip;

[0037] p - the number of pole pairs of the motor.

[0038] It...

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Abstract

The invention discloses a frequency conversion constant-pressure water supply system and a control method thereof. The frequency conversion constant-pressure water supply system is characterized in that a programmable controller and a frequency converter are connected with a PID (Proportion Integration Differentiation) regulator and control a water pump set; and the PID regulator detects water pressure through a pressure sensor. The control method of the frequency conversion constant-voltage water supply system comprises the following steps of: when water consumption is increased, enhancing the working frequency of a water pump, and accelerating the revolving speed of the water pump; when water consumption is decreased, reducing the working frequency of the water pump, and decelerating the revolving speed of the water pump. The invention regulates the revolving speed of various pumps in the living water supply system by adopting the frequency converter and can realize that one frequency converter simultaneously controls multiple water pumps, realize automatic constant-pressure water supply and additionally set a night small pump operating and fire-fighting function.

Description

Technical field: [0001] The invention relates to a domestic water supply system, in particular to a constant pressure water supply system and a control method for the system. Background technique: [0002] The water supply system is a set of hydrological and hydraulic engineering systems, involving water collection, treatment, transmission and other processes, to provide users with clean fresh water. [0003] Domestic water supply system plays a vital role in people's daily life. For domestic water supply systems, the performance of the system depends on whether it can achieve constant pressure water supply and whether it can save energy. [0004] As we all know, ordinary centrifugal pumps in parallel cannot achieve constant pressure water supply, which is determined by the hydraulic geometry of centrifugal pumps. At a fixed speed, the characteristic curve of a single centrifugal pump shows a downward trend. If two centrifugal pumps of the same model are operated in paral...

Claims

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Application Information

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IPC IPC(8): E03B11/16
Inventor 吴永旭蒋燕旭
Owner SHANGHAI EAST PUMP(GRP) CO LTD
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