Flow compensation technology of digital frequency conversion metering pump

A technology of flow compensation and digital frequency conversion, which is applied in the field of metering pumps, can solve the problems of heavy fertilization workload, high cost of manpower and financial resources, etc., and achieve the effect of improving output accuracy and precise fluid dosing

Inactive Publication Date: 2011-04-27
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (6) Fertilizer irrigation is an important means to improve the yield and quality of agricultural products, but the workload of fertilizing a large area of ​​land is very large, which requires a lot of manpower and financial resources

Method used

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  • Flow compensation technology of digital frequency conversion metering pump
  • Flow compensation technology of digital frequency conversion metering pump
  • Flow compensation technology of digital frequency conversion metering pump

Examples

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Embodiment Construction

[0025] exist figure 1 Middle: The digital frequency conversion metering pump is composed of a special digital frequency converter 1, a three-phase asynchronous gear motor 2 and a reciprocating diaphragm metering pump 3. The dedicated digital frequency converter consists of a main control module 4 and a drive module 5 . By detecting information such as the temperature of the drive module 5 and whether it is overcut (overcurrent), the main control module 4 decides whether to take corresponding protection measures; through the speed detection components (parts) such as encoders or Hall devices, detect three-phase asynchronous The speed of geared motor 2 is used for closed-loop control. If there is no speed signal after starting the three-phase asynchronous geared motor 2, it indicates that there is a fault in the three-phase asynchronous geared motor 2 or a fault in the speed sensor, and the main control module 4 controls the drive module 5 to enter the protection state. If the...

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Abstract

The invention belongs to the technical field of metering pumps, and particularly relates to the flow compensation technology of a digital frequency conversion metering pump. The flow compensation technology is characterized by comprising a method for determining and compensating for the error of manufacturing accuracy, a method for determining and compensating for rotate speed and outlet pressure, a method for determining and compensating for fluid viscosity coefficients and a method for determining and compensating for working hours. In the technology, error values of theoretical displacement caused by four factors of the manufacturing accuracy, the rotate speed and outlet pressure, the fluid viscosity coefficients and the working hours are calculated, and the theoretical displacement is compensated for according to the error values to obtain accurate actual displacement finally, so that the flow is calculated accurately by using the actual displacement in actual flow control; and in the technology, the manufacturing accuracy, the rotate speed and outlet pressure, the fluid viscosity coefficients and the working hours which influence the output displacement of the metering pump can be compensated, so the output accuracy of the metering pump is improved effectively, and the accurate constant-ratio addition of fluid is realized.

Description

technical field [0001] The invention belongs to the technical field of metering pumps, in particular to a flow compensation technology of a digital variable frequency metering pump. Background technique [0002] As a branch of reciprocating pumps, metering pumps are widely used in the quantitative and proportional dosing of fluids in industries such as petroleum, chemical industry, water treatment, food, pharmaceuticals, environmental protection, and medical equipment. heart and engine. According to incomplete statistics, metering pumps are mainly used in the following aspects: [0003] (1) Adjustment and control of additive flow rate and PH value in chemical process and power plant boiler water quality treatment process. The dosage of various reaction catalysts and additives must be controlled within a certain range in order to ensure product quality requirements. [0004] (2) Proportion delivery of chemical or biological additives during water treatment. In this applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B51/00
Inventor 余世明朱智勇
Owner ZHEJIANG UNIV OF TECH
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