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Low-power centrifugal pump

A technology for centrifugal pumps and electric motors, applied in pumps, pump control, pump devices, etc., can solve problems such as inconsistent pressure or assembled pipelines, high cost, affecting flow design and use effects, etc.

Active Publication Date: 2018-12-21
HANYU GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the inconsistency of the ambient pressure at the outlet and inlet of the traditional small-power centrifugal pump or the installation pipeline, the actual flow rate of the centrifugal pump is uncertain when it is used, which affects the flow design and use effect.
Using the classic flow detection negative feedback stabilization control, the cost is relatively high

Method used

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Embodiment Construction

[0028] The basic mechanical structure of the centrifugal pump in the embodiment of the present invention is as follows: figure 1 As shown, it is improved on a traditional centrifugal pump for washing utensils. The impeller of the centrifugal pump is centrifugal, with a diameter of 90mm, a number of 7 blades, and a rated speed of 2500r / m; other diameters in the range of 70-110mm, more blades (preferably within 11 pieces) and higher speeds are also available. The rated length of the outlet pipe is 1-10m. Major improvements include:

[0029] ——The motor 17 fixed on the casing is changed from the original AC motor to a sensorless permanent magnet brushless DC motor with a rated voltage of 24V;

[0030] ——The control circuit installed in the rear cover of the motor is changed to circuit board 8;

[0031] ——The AC power supply of the external power grid supplies power to the AC motor through the original control circuit after being input from the traditional centrifugal pump powe...

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Abstract

A low-power centrifugal pump comprises a centrifugal impeller, a pump case which is tangent to an outlet in the rotation direction, an electric motor directly driving the impeller and a control circuit of the electric motor. The low-power centrifugal pump is characterized in that the diameter of the impeller is 70-110 mm, and the rated speed is not lower than 2000 r / m; the electric motor is a permanent magnetic brushless motor; the control circuit inputs a power supply and pulse-width modulation (PWM) signals controlling the power supply to control the rotation speed and outputs rotation speedsignals; the control circuit contains a built-in program; the built-in program comprises the step of inputting the power supply and the PWM signals controlling the power supply to the electric motoraccording to the constant value of the flow of the centrifugal pump and the rotation speed signals; and when the rotation speed of the electric motor is changed, the duty ratio of the PWM signals andthe changes of the rotation speed change positively and relatively. The flow of the centrifugal pump can be better constant, and the cost is low.

Description

technical field [0001] The invention relates to a small-power centrifugal pump, in particular to the cooperation of its machinery, motor and control method. The IPC classification can belong to F04D13 / 06 or F04D15 / 00. Background technique [0002] Due to the inconsistency of the ambient pressure of the outlet and the inlet of the traditional small-power centrifugal pump or the installation pipeline, the actual flow of the centrifugal pump is uncertain when it is used, which affects the flow design and use effect. Using the classic flow detection negative feedback stabilization control, the cost is relatively high. [0003] Regarding terminology and common sense, except as specified in this manual, you can refer to the national standard GB7021-86 "Terminology for Centrifugal Pumps", GB / T 23105-2008 "Household and Similar Electric Water Pumps" and "Engineering Fluid Mechanics" (Northeast Institute of Technology Li Shijiu, Mechanical Industry Press, 1st edition in Beijing in 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D13/06F04D15/00
CPCF04D13/06F04D15/0066
Inventor 区长钊
Owner HANYU GRP CO LTD