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Intelligent type volume type constant-current flow gauge and measuring control method

A volumetric and intelligent technology, applied in the flow control of electric devices, etc., can solve the problems of affecting the accuracy of flow control, impact, and increased maintenance

Inactive Publication Date: 2008-09-17
王磊
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Failure to form a continuous and stable flow control has an impact on occasions that require strict uniformity such as mixing
Secondly, the sealing parts of the plug pump (metering pump) for strong corrosion liquid are easy to corrode, which affects the flow control accuracy and increases the maintenance amount

Method used

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  • Intelligent type volume type constant-current flow gauge and measuring control method
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  • Intelligent type volume type constant-current flow gauge and measuring control method

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Embodiment Construction

[0008] exist figure 1 Among them, the constant flow barrel (4) is open, and the valve outlet of the stepping electric actuator (7) is free flow. Assuming that the stepping electric actuator (7) valve outlet to the liquid level height of the constant flow barrel (4) is h, the stepping electric actuator (7) valve flow cross section is A, and the flow through the valve is according to the tori (E. Torricelli, 1644) formulas are:

[0009] Q = μA 2 gh - - - ( a )

[0010] Among them, μ is called the flow correction coefficient.

[0011] It is assumed that the increase or decrease of the valve stem displacement L of the stepping electric actuator (7) is linearly related to the increase or decrease of the valve flow section A

[0012] A=kL (b)

[0013] kScale factor.

[0014] (a)(b) incorporates:

[0015] Q ...

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Abstract

The invention pertains to high precision continuous liquid flow testing and controlling technique. The invention provides a flow controller with high testing and controlling precision which can be used in deep-etching liquid. A volume metering and constant-current regulation manner is used to measure and control flow. A time difference correcting algorithm can realize that the flow cumulative error tends towards zero when the time difference correcting algorithm is used. In the invention, a liquid inlet constant volume control is composed of a measuring tank, two bit electromagnetic valves, dried reed pipes, a circular disc magnetic float and a float conductive pole; and a liquid outlet constant volume control is composed of a constant-current tank, a dried reed pipe, a circular disc magnetic float, a float conductive pole and a step-by-step motion electric activator. The measuring tank is controlled by a liquid level dried reed pipe under the constant-current tank to have timing liquid discharge and renewable liquid inlet. The constant-current tank liquid level ascends, the outlet flow increases, and the step-by-step motion electric activator gradually closes. The constant-current tank liquid level descends, the outlet flow reduces, and the step-by-step motion electric activator gradually opens to maintaining the constant of flow quantity.

Description

Technical field: [0001] This patent belongs to high-precision and continuous liquid flow detection and control technology. Background technique: [0002] When the mixed material enters the reactor, mixing tank and other equipment, it is necessary to perform high-precision flow detection and control of the liquid to control the product quality. At present, there are mass flowmeters, ultrasonic flowmeters, and electromagnetic flowmeters for high-precision liquid flow detection, but they are expensive, have large errors in micro-flow detection, and have no flow control. At present, the most commonly used volumetric flow measurement and control is realized by measuring a certain volume of liquid under a barrel within a certain time interval, and the flow is intermittent. Syringe pump (metering pump) also belongs to volumetric flow measurement and control, and the flow output has pulsating components. Failure to form a continuous and stable flow control has an impact on occasio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D7/06
Inventor 王磊
Owner 王磊
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