Method for controlling opening degree of water meter valve

Abstract

The invention discloses a method for controlling the opening degree of a water meter valve, which is mainly used for controlling the opening degree of the valve through three stages and specifically comprises the following steps: stage 1: the valve is subjected to valve washing operation once a week by default, and the complete action time from closing to opening or from opening to closing is recorded once during valve washing; the time is used as the latest rated valve action time; stage 2, no matter what state the valve is currently in, the valve is firstly opened in place through locked-rotor current judgment, so that the advantage is that the valve is in a known and determined state; and stage 3, calculating the valve closing time according to the required opening degree, wherein the calculation formula is that the valve closing time = rated valve action time * (1-valve opening degree percentage). According to the method, the implementation scheme is simple, the accurate valve opening action can be achieved according to the flow no matter what the valve is in the opening and closing state currently, and the opening and closing angles of the valve are accurately controlled.

Description

Technical Field

[0001] The invention relates to the technical field of water meter valve opening control, in particular to a method for controlling the opening of a water meter valve. Background Art

[0002] With the popularization of intelligent water meters, operators can summarize and quantify water meter data at the terminal, and the control requirements for water meters are becoming higher and higher. Existing technologies are mostly based on automatic switching valves, which only require the valves to be opened or closed in place, and there is no demand or plan for the opening degree, and it is impossible to accurately control the opening and closing angles of the valves.

[0003] Therefore, in order to correct the above defects, we propose a method for controlling the opening of the water meter valve. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a method for controlling the opening of a water meter valve.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a method for controlling the opening of a water meter valve, which mainly controls the valve opening in three stages, as follows:

[0006] Phase 1: The valve will be cleaned once a week by default. During the cleaning, the time of a complete valve operation from closed to open or from open to closed is recorded and used as the latest rated valve operation time.

[0007] Phase 2: Regardless of the current state of the valve, the valve is first opened by determining the locked-rotor current. This has the advantage of keeping the valve in a known and determined state.

[0008] Stage 3: Calculate the valve closing time based on the required opening. The calculation formula is: valve closing time = rated valve operation time * (1-valve opening percentage). When the motor completes the operation according to this time, it is considered that the valve state has reached the required opening.

[0009] Furthermore, in the said stage 1, the valve is cleaned once a week by default, which is not only to accurately judge the valve opening and closing time at that time, but also to evaluate the moisture condition of the motor. If the motor working current exceeds 60mA throughout the whole process, it can be judged that the motor has been damp. If it exceeds 80mA throughout the whole process, it can be judged that the motor has been seriously damp and the corresponding accessories need to be replaced in time.

[0010] Furthermore, in the three stages, the valve opening and closing time will be prolonged as the working time increases. If the valve opening and closing time this time is shorter than the previous time by more than 10%, it is determined that the valve is working abnormally.

[0011] Furthermore, in the three stages, if the valve opening and closing time within a period of time is extended by more than 30% compared with the previous two times, it is judged that the moisture-proof effect of the motor is poor and has been seriously affected by moisture.

[0012] Furthermore, in the stage 3, the valve opening percentage can preset the maximum water flow rate, such as the valve opening is 30%, the maximum water flow rate = Q3×50%. When the measured maximum flow rate exceeds this value, the valve opening can be slightly closed according to the measured flow rate value, and the valve opening can be fine-tuned according to the measured flow rate - rated maximum flow rate; or when the measured maximum flow rate is lower than this value for a long time, the valve opening can be slightly opened according to the measured flow rate.

[0013] Furthermore, in the stage 3, after the valve opening is set, if the measured maximum flow rate exceeds the set value and the maximum flow rate measured after two consecutive micro-closing of the valve opening has no significant change from the previous value, the valve is judged to be abnormal.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the implementation scheme of the present invention is simple, and no matter what switching state the valve is currently in, it can achieve relatively accurate valve opening action according to the process, accurately control the valve opening and closing angles, and the water meter does not need any additional sensors, and the application cost is low. This method is suitable for magnetic transmission valve-controlled water meters, and the function of the water meter valve to operate according to the required opening is achieved by controlling the action time of the motor in conjunction with PWM modulation of the motor output and motor stall current detection. The valve control system ensures the waterproof performance of the transmission system through magnetic transmission, and controls the torque of the magnetic transmission to the motor output through PWM modulation to ensure that the motor will not be demagnetized when the valve is stalled due to excessive torque, and determines whether the valve is switched in place by detecting the motor current. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] The present invention provides a technical solution:

[0018] See also Figure 1 A method for controlling the opening of a water meter valve is proposed. The control process is mainly divided into three stages to control the valve operation.

[0019] In the first phase, the rated valve actuation time must be regularly updated to prevent changes in valve actuation time due to valve wear, motor aging, etc. By default, the valve is cleaned once a week. During this cleaning, the complete actuation time from closed to open, or from open to closed, is recorded and used as the latest rated valve actuation time.

[0020] In the second stage, no matter what state the valve is currently in, the valve is first opened by judging the locked-rotor current. The advantage of this is that the valve is in a known and determined state, which is convenient for subsequent processing.

[0021] In the third stage, the valve closing time is calculated based on the required opening. For example, if the rated valve operating time is 10 seconds and the valve opening requirement is 30%, the valve closing time is 10*(1-0.3)=7 seconds. Once the motor completes the required operation time, the valve is considered to have reached the required opening.

[0022] Among the above,

[0023] 1. The water meter is used in a humid environment. After the water meter has been working for a period of time, the motor speed will gradually decrease after being damp, and the valve opening and closing time will be prolonged. The valve is cleaned once a week by default. This is not only to accurately judge the valve opening and closing time at that time, but also to assess the moisture condition of the motor. For example, when the motor working current exceeds 60mA throughout the entire process, it can be judged that the motor has been damp. If it exceeds 80mA throughout the entire process, it can be judged that the motor has been seriously damp and the corresponding accessories need to be replaced in time.

[0024] 2. The valve opening and closing time will be extended as the working time increases. If the valve opening and closing time this time is significantly shorter than the previous time (such as more than 10%), it can be judged that the valve is working abnormally, such as the valve is not opened and closed in place.

[0025] 3. If the valve opening and closing time is significantly longer than the previous two times (such as an increase of more than 30%) within a period of time (such as two weeks), it can be judged that the motor's moisture-proof effect is poor and it has been seriously affected by moisture and needs to be replaced immediately.

[0026] 4. The valve opening percentage can be set to preset the maximum water flow rate. For example, if the valve opening is 30%, the maximum flow rate = Q3 × 50%. When the measured maximum flow rate exceeds this value, the valve opening can be slightly closed according to the measured flow rate (the valve opening can be fine-tuned according to the measured flow rate - rated maximum flow rate); or when the measured maximum flow rate is lower than this value for a long time, the valve opening can also be slightly opened according to the measured flow rate.

[0027] 5. After the valve opening is set, if the valve opening is 30%, the measured maximum flow rate exceeds the set value and the maximum flow rate measured after two consecutive micro-closing of the valve opening has no obvious change from the previous value, the valve is judged to be abnormal.

[0028] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for controlling the opening of a water meter valve, characterized in that: The valve opening is controlled in three stages, as follows: Phase 1: The valve will be cleaned once a week by default. During the cleaning, the time of a complete valve operation from closed to open or from open to closed is recorded and used as the latest rated valve operation time. Phase 2: Regardless of the current state of the valve, the valve is first opened by determining the locked-rotor current. This has the advantage of keeping the valve in a known and determined state. Stage 3: Calculate the valve closing time based on the required opening. The calculation formula is: valve closing time = rated valve operation time * (1-valve opening percentage). When the motor completes the operation according to this time, it is considered that the valve state has reached the required opening.

2. The method for controlling the opening of a water meter valve according to claim 1, characterized in that: In the stage 1, the valve is cleaned once a week by default. This is to accurately determine the valve opening and closing time at that time and to assess the moisture condition of the motor. If the motor operating current exceeds 60mA throughout the entire process, it can be determined that the motor has been damp. If it exceeds 80mA throughout the entire process, it can be determined that the motor has been seriously damp and the corresponding accessories need to be replaced in time.

3. The method for controlling the opening of a water meter valve according to claim 3, characterized in that: In the three stages, the valve opening and closing time will be extended as the working time increases. If the current valve opening and closing time is more than 10% shorter than the previous time, it is judged that the valve is working abnormally.

4. The method for controlling the opening of a water meter valve according to claim 1, wherein: In the three stages, if the valve opening and closing time is extended by more than 30% compared with the previous two times within a period of time, it is judged that the motor's moisture-proof effect is poor and it has been seriously affected by moisture.

5. The method for controlling the opening of a water meter valve according to claim 1, characterized in that: In the stage 3, the valve opening percentage can preset the maximum water flow rate, such as the valve opening is 30%, the maximum water flow rate = Q3 × 50%. When the measured maximum flow rate exceeds this value, the valve opening can be slightly closed according to the measured flow rate value, and the valve opening can be fine-tuned according to the measured flow rate - rated maximum flow rate; or when the measured maximum flow rate is lower than this value for a long time, the valve opening can be slightly opened according to the measured flow rate.

6. The method for controlling the opening of a water meter valve according to claim 1, characterized in that: In the stage 3, after the valve opening is set, if the measured maximum flow rate exceeds the set value and the maximum flow rate measured after two consecutive micro-closing of the valve opening has no significant change from the previous value, the valve is judged to be abnormal.

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