Electric switch valve adjusting method for fluid control

Abstract

The invention discloses an electric switch valve adjusting method for fluid control, which comprises the following steps: respectively calculating the corresponding speed during opening or closing according to the opening and closing time of an electric valve, and calculating the corresponding actual valve position by comparing the size of the set valve position and the actual valve position of the electric valve and utilizing the opening or closing time and speed. The method has the advantages that the electric valve is controlled to act according to the set valve position by calculating the corresponding relation between the speed and the valve position when the valve is opened and closed according to the opening and closing time of the electric valve, operation is easy and convenient, the effect is remarkable, the electric control valve does not need to be replaced, the requirement for continuous control according to the valve position is met, and investment and transformation time are saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric valve control of fluids, and particularly relates to a method for adjusting an electric on-off valve for fluid control. Background Art

[0002] On fluid medium pipelines, electric valves are often installed to open and cut off fluids. Common fluid media include water, air, dust removal flue gas, etc. However, with the requirements of process needs and energy conservation and emission reduction, electric valves usually need to be continuously controlled according to process requirements. For example, the valve on the dust removal pipeline automatically adjusts the opening degree according to process changes. Comparing with the dust removal fan when the valve is fully open, a large amount of electric energy can be saved. However, the current electric on-off valve cannot meet this requirement. If directly replacing with an electric regulating valve, a large amount of investment is necessarily required, the production cost will increase greatly, and the selection of the installation position and the installation difficulty are also very large. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems that the existing electric on-off valve cannot adjust the opening degree according to actual needs, has a high replacement cost, and a large installation difficulty, and provides a method for adjusting an electric on-off valve for fluid control, which can realize the control of the electric on-off valve according to the regulating valve, not only saving costs and time, but also having a good energy-saving effect and being easy to operate.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions: A method for adjusting an electric on-off valve for fluid control includes calculating the corresponding speed when opening or closing respectively according to the opening and closing time of the electric valve, and then calculating the corresponding actual valve position by comparing the set valve position and the actual valve position of the electric valve and using the opening or closing time and speed.

[0005] Further, when calculating the opening speed V1, first close the electric valve in place, then open the electric valve until it is opened in place, record the time T1 required for its opening degree to change from 0% to 100%, and the corresponding speed V1 from 0% to 100% of the opening degree when opening can be calculated according to the opening degree and time, with the unit of s / %, and the value is taken at least to 1 decimal place after the decimal point.

[0006] Further, when calculating the closing speed V2, first open the electric valve in place, then close the electric valve until it is closed in place, record the time T2 required for its opening degree to change from 100% to 0%, and the corresponding speed V2 from 100% to 0% of the opening degree when closing can be calculated according to the opening degree and time, with the unit of s / %, and the value is taken at least to 1 decimal place after the decimal point.

[0007] Further, when receiving the in-place limit of the electric valve opening, the actual valve position is assigned 100%; when receiving the in-place limit of the electric valve closing, the actual valve position is assigned 0%.

[0008] Further, when comparing the set valve position with the actual valve position, if the actual valve position < the set valve position, the electric valve is controlled to open. During the opening process, according to the opening time T1 and the opening speed V1, the actual valve position W1 is calculated in real time. When the actual valve position W1 reaches the set valve position, the electric valve stops.

[0009] Further, when comparing the set valve position with the actual valve position, if the actual valve position > the set valve position, the electric valve is controlled to close. During the closing process, according to the closing time T2 and the closing speed V2, the actual valve position W2 is calculated in real time. When the actual valve position W2 reaches the set valve position, the electric valve stops.

[0010] Further, if the set valve position is 100%, the electric valve opens and stops when receiving the limit that the valve is fully opened; if the set valve position is 0%, the electric valve closes and stops when receiving the limit that the valve is fully closed.

[0011] Further, the calculation and control of the valve position are realized through the PLC and DCS control systems, and the relevant signals of the valve are displayed on the local operation box and the HMI screen.

[0012] In the technical solution of the present invention, by controlling the electric on-off valve as a regulating valve, investment and time are saved, the operation is simple and convenient, the work efficiency and the automation level are improved, and at the same time, immediate effects are achieved, and the energy-saving benefit is remarkable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a flow chart of the method for regulating an electric on-off valve for fluid control according to the present invention. DETAILED DESCRIPTION OF THE INVENTION Embodiment

[0014] To make the present invention more clearly understood, the following further describes a method for regulating an electric on-off valve for fluid control according to the present invention with reference to the drawings. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0015] See Figure 1 , a method for regulating an electric on-off valve for fluid control, characterized in that: (1) Calculation of the opening speed V1: First, close the electric valve in place, and then open the electric valve until it is fully opened. Record the time T1 required for its opening degree to change from 0% to 100%. According to the opening degree and time, the speed V1 corresponding to the opening degree from 0% to 100% during opening can be calculated, with the unit of s / %, and the value is taken to at least one decimal place. At the same time, the actual valve position is assigned 100%. (2)Calculation of the closing speed V2: First, open the electric valve fully, and then close the electric valve until it is fully closed. Record the time T2 required for its opening to change from 100% to 0%. According to the opening and time, the speed V2 corresponding to the opening change from 100% to 0% during closing can be calculated. The unit is s / %, and the value should be taken to at least 1 decimal place after the decimal point. At the same time, assign the actual valve position as 0%. (3)If the actual valve position < the set valve position, control the electric valve to open. During the opening process, according to the opening time T1 and the opening speed V1, calculate the actual valve position W1 in real time. When the actual valve position W1 reaches the set valve position, the electric valve stops. (4)If the actual valve position > the set valve position, control the electric valve to close. During the closing process, according to the closing time T2 and the closing speed V2, calculate the actual valve position W2 in real time. When the actual valve position W2 reaches the set valve position, the electric valve stops.

[0016] In this embodiment, in steps (3) and (4), if the set valve position is 100%, the electric valve opens and stops when the open limit of the electric valve is received; if the set valve position is 0%, the electric valve closes and stops when the closed limit of the electric valve is received.

[0017] In this embodiment, the calculation and control of the valve position of the electric valve are implemented within control systems such as PLC and DCS, and relevant valve signals are displayed on the local operation box, HMI screen, etc.

[0018] The present invention calculates the corresponding relationship between the speed and valve position when the electric valve opens and closes according to the opening and closing times of the electric valve, controls the electric valve to act according to the set valve position, is easy to operate, and has remarkable effects. It can meet the requirement of continuous control according to the valve position without replacing the electric control valve, saving investment and transformation time.

[0019] In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. An electric switch valve adjustment method for fluid control, characterized in that: According to the opening and closing times of the electric valve, the corresponding speeds during opening or closing are calculated respectively, and then by comparing the set valve position and the actual valve position of the electric valve, the corresponding actual valve position is calculated using the opening or closing time and speed.

2. The electric switch valve adjustment method for fluid control according to claim 1, characterized in that: When calculating the opening speed V1, first close the electric valve in place, then open the electric valve until it is fully open, record the time T1 required for its opening degree to change from 0% to 100%, and the opening speed V1 corresponding to the opening degree changing from 0% to 100% during opening can be calculated according to the opening degree and time. The unit is s / %, and the value is taken at least to 1 decimal place after the decimal point.

3. The electric switch valve adjustment method for fluid control according to claim 1, characterized in that: When calculating the closing speed V2, first open the electric valve in place, then close the electric valve until it is fully closed, record the time T2 required for its opening degree to change from 100% to 0%, and the closing speed V2 corresponding to the opening degree changing from 100% to 0% during closing can be calculated according to the opening degree and time. The unit is s / %, and the value is taken at least to 1 decimal place after the decimal point.

4. The electric switch valve adjustment method for fluid control according to claim 2 or 3, characterized in that: When the electric valve reaches the open position limit is received, the actual valve position is assigned 100%; when the electric valve reaches the closed position limit is received, the actual valve position is assigned 0%.

5. The electric switch valve adjustment method for fluid control according to claim 2, characterized in that: When comparing the set valve position and the actual valve position, if the actual valve position < the set valve position, then control the electric valve to open. During the opening process, according to the opening time T1 and the opening speed V1, the actual valve position W1 is calculated in real time. When the actual valve position W1 reaches the set valve position, the electric valve stops.

6. The electric switch valve adjustment method for fluid control according to claim 3, characterized in that: When comparing the set valve position and the actual valve position, if the actual valve position > the set valve position, then control the electric valve to close. During the closing process, according to the closing time T2 and the closing speed V2, the actual valve position W2 is calculated in real time. When the actual valve position W2 reaches the set valve position, the electric valve stops.

7. The electric switch valve adjustment method for fluid control according to claim 5 or 6, characterized in that: If the set valve position is 100%, then the electric valve opens and stops when the electric valve open position limit is received; if the set valve position is 0%, then the electric valve closes and stops when the electric valve closed position limit is received.

8. The electric switch valve adjustment method for fluid control according to claim 1, characterized in that: The calculation and control of the valve position are realized through a PLC or DCS control system, and the relevant signals of the valve are displayed on the local operation box and the HMI screen.

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