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Method for controlling fluid flow through a valve

A technology of fluid flow and controller, which is applied in the field of fluid flow of valves, and can solve problems such as increasing the cost of fluid flow systems and expensive flow sensors

Active Publication Date: 2020-12-25
DANFOSS AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Those flow sensors capable of measuring low flow rates with high accuracy are quite expensive and can add significantly to the cost of the fluid flow system

Method used

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  • Method for controlling fluid flow through a valve
  • Method for controlling fluid flow through a valve
  • Method for controlling fluid flow through a valve

Examples

Experimental program
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Embodiment Construction

[0048]figure 1 It is a cross-sectional view of the valve 100 which includes a valve seat 101 and a valve element 102. The valve element 102 can move relative to the valve seat 101, and the opening degree of the valve 100 is determined by the relative position between the valve seat 101 and the valve element 102. The fluid flowing through the valve 100 enters the valve 100 through the fluid inlet 104, passes through the passage defined between the valve seat 101 and the valve element 102, and exits the valve 100 through the fluid outlet 105. The position of the valve element 102 relative to the valve seat 101 determines the size of the passage, thereby determining the opening degree of the valve 100.

[0049]The valve 100 also includes a flow sensor 103 arranged at the fluid inlet 104. However, it should be understood that the flow sensor 103 may alternatively be arranged at the fluid outlet 105 or at other suitable locations along the flow path through the valve 100. Therefore, the flo...

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PUM

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Abstract

A method for controlling a fluid flow through a valve (100) arranged in a fluid flow system (400), the fluid flow system further having a flow sensor (103) arranged therein. A flow rate, Q M , is measured by means of the flow sensor (103) and compared to a predetermined flow rate threshold value, Q T . In the case that Q M <Q T , a calibration of the flow sensor (103) is performed including changing the opening degree of the valve (100) while measuring the flow rate by means of the flow sensor (103), establishing a relationship between actual flow rate and opening degree of the valve (100), based on the measurements of the flow rate during change of the opening degree and determining a correction, C, based on the established relationship. The opening degree of the valve (100) is then controlled on the basis of flow rate measurements performed by means of the flow sensor (103), corrected by the correction.

Description

Technical field[0001]The invention relates to a method for controlling the flow of fluid through a valve arranged in a fluid flow system.Background technique[0002]In order to improve the energy efficiency of the fluid flow system, it is necessary to measure and adjust the fluid flow. By measuring, controlling, and adjusting, for example, the flow rate in a heating or cooling system, the amount of energy exchanged by the system to heat or cool a building is measured and adjusted. The flow of fluid is regulated by many valves (ie, by changing the opening degree of the valve). The valves are usually controlled by the system controller, which determines the desired flow through the system. The system controller can be or form part of a building management system, room controller, etc. In the case where the fluid flow system includes at least one flow sensor, the system controller may receive the current fluid flow value from the flow sensor that measures the fluid flow, and control the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D3/01F16K1/32F16K31/00F16K37/00
CPCG05D7/06G01F15/003G01F15/005G05D7/0635G01F1/00G01F25/00
Inventor 彼得·诺斯
Owner DANFOSS AS