A control method for a solenoid valve with state monitorability

Abstract

The present invention discloses a state-monitorable solenoid valve, including a solenoid valve body, an upper chamber fixedly installed above the solenoid valve body, a static iron core placed in the center of the upper chamber, an electromagnet coil with the center of the upper chamber as the axis wound on the static iron core, the bottom of the static iron core is fixedly connected to one end of a reset spring, the other end of the reset spring extends into a circular hole at the top of a moving iron core, the bottom of the moving iron core is fixedly connected to a sealing member, the sealing member is used to seal the valve port of the water outlet chamber of the solenoid valve body, and two working condition monitoring sensors symmetrically arranged about the reset spring are also provided at the bottom of the static iron core, and the working condition monitoring sensors are electrically connected to a signal processing module. The present invention receives and processes the pressure signal of the working condition monitoring sensor at the bottom of the static iron core through the signal processing module, accurately judges the real-time working condition of the solenoid valve, effectively solves the problem that the working state of the traditional solenoid valve cannot be monitored, and provides a reliable basis for daily use and maintenance.

Description

Technical Field

[0001] The invention belongs to the technical field of solenoid valves, and in particular relates to a control method for a solenoid valve with a monitorable state. Background Art

[0002] With the rapid growth of the world economy and population, the consumption of freshwater resources is also increasing at an alarming rate. How to save water and achieve efficient use of freshwater resources has become a problem that humans need to solve urgently. From the perspective of automation of agricultural production (pipeline water supply control), it is particularly important to reduce waste water in the water supply process, perform precise water supply control, and find low-cost and reliable control equipment.

[0003] Solenoid valves are basic automation components that use electromagnetics to control the opening and closing of fluid passages. They have other functions such as regulating the flow direction and flow rate of the medium. Due to their small size, fast switching speed, simple wiring, low power consumption, high cost performance, and economical and practical advantages, solenoid valves have been widely used in various control links of pipeline water delivery.

[0004] The traditional solenoid valve has a relatively simple structure and can only achieve two actions: opening and closing the fluid passage. In daily use, the iron core often gets stuck, resulting in the solenoid valve not being able to open normally after power is turned on, which brings great inconvenience to the precise control and stable use of the pipeline water supply system. Under the conditions of maintaining the advantages of low price and convenient control of solenoid valves, it is urgent to develop solenoid valves with working condition feedback function to solve the problems encountered in current use. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a control method for a solenoid valve with a state that can be monitored, which solves the problem that the working state of a traditional solenoid valve cannot be monitored. The present invention receives and processes the pressure signal of the working condition monitoring sensor at the bottom of the static iron core through a signal processing module, which can provide real-time feedback on the working condition of the solenoid valve and accurately determine the opening and closing state of the solenoid valve.

[0006] Technical solution: The present invention provides a control method for a state-monitored solenoid valve, comprising a solenoid valve body, an upper chamber fixedly installed above the solenoid valve body, a static iron core placed at the center of the upper chamber, an electromagnet coil with the center of the upper chamber as the axis wound on the static iron core, the bottom of the static iron core is fixedly connected to one end of a reset spring, the other end of the reset spring extends into a circular hole at the top of a moving iron core, the bottom of the moving iron core is fixedly connected to a sealing member, the sealing member is used to seal a valve port of a water outlet chamber of the solenoid valve body, and two working condition monitoring sensors symmetrically arranged with respect to the reset spring are also provided at the bottom of the static iron core, and the working condition monitoring sensors are electrically connected to a signal processing module;

[0007] When the electromagnet coil is energized, the moving iron core is attracted by the static iron core, the return spring is compressed, and the seal is separated from the valve port of the water outlet chamber, and the solenoid valve is turned on. The operating condition monitoring sensor is used to collect the pressure signal generated by the pressure of the moving iron core, and send the pressure signal to the signal processing module. The signal processing module processes the pressure signal to obtain the status information of the solenoid valve.

[0008] Furthermore, the working condition monitoring sensor is a resistance strain sensor, and its resistance value changes with the size of the external pressure; the signal processing module obtains the state information of the solenoid valve according to the pressure signal transmitted by the change of the resistance value of the resistance strain sensor. When the moving iron core hits the working condition monitoring sensor, the strain gauge is deformed and the resistance value increases; when the moving iron core is blocked and cannot move upward, the strain gauge of the resistance strain sensor does not deform and its resistance value does not change.

[0009] Furthermore, a working condition verification sensor is also provided in the water outlet chamber of the solenoid valve body. The working condition verification sensor is electrically connected to the signal processing module. The signal processing module determines the status information of the solenoid valve based on the water flow pressure signal transmitted by the working condition verification sensor and combined with the pressure signal of the working condition monitoring sensor.

[0010] Furthermore, the signal processing module determines the state information of the solenoid valve according to the pressure signal of the working condition monitoring sensor and the water flow pressure signal of the working condition verification sensor, and the process is as follows: when the working condition monitoring sensor has a pressure signal and the working condition verification sensor has a water flow pressure signal and reaches the maximum value corresponding to the normal working condition, the signal processing module determines and processes the two signals to determine that the solenoid valve is normally open; when the working condition monitoring sensor has a pressure signal and the working condition verification sensor has no water flow pressure signal or the water flow pressure signal is less than the maximum value corresponding to the normal working condition, the signal processing module determines that there is a blockage in the water outlet chamber of the solenoid valve body; when the working condition monitoring sensor has no pressure signal and the working condition verification sensor has a water flow pressure signal, the signal processing module determines that the moving iron core is stuck and the solenoid valve cannot be fully opened or the solenoid valve has leakage and cannot be completely closed; when the working condition monitoring sensor has no pressure signal and the working condition verification sensor has no water flow pressure signal, the signal processing module determines that the solenoid valve is normally closed.

[0011] Furthermore, the operating condition verification sensor is a resistive strain sensor, whose resistance value changes with the magnitude of the external pressure; when the solenoid valve is normally opened, the water flow pressure passing through the water outlet chamber of the solenoid valve body makes the resistance value of the operating condition verification sensor reach the maximum value under the corresponding operating condition; when the water outlet chamber of the solenoid valve body is blocked, the resistance value of the operating condition verification sensor is lower than the maximum value under normal operating conditions.

[0012] Furthermore, a junction box is fixedly installed on one side of the upper chamber, and a power supply is arranged in the junction box, and the power supply supplies power to the electromagnet coil, the working condition monitoring sensor, the signal processing module and the working condition verification sensor.

[0013] Furthermore, the signal processing module is a single chip microcomputer.

[0014] Furthermore, the signal processing module is also electrically connected to a display, and the display is connected to a power supply of a junction box via a power connection line.

[0015] Beneficial effects: the present invention has the following advantages:

[0016] (1) Based on the pressure signal generated by the working condition monitoring sensor arranged at the bottom of the static iron core received by the signal processing module, it can accurately and reliably determine whether the moving iron core is sucked up, and feedback the opening and closing status of the solenoid valve, avoiding the failure to achieve the predetermined control effect due to the failure of the solenoid valve to open normally, and providing a basis for timely maintenance;

[0017] (2) Based on the water flow pressure signal generated by the working condition verification sensor arranged inside the water outlet chamber of the solenoid valve body and received by the signal processing module, the working condition of the solenoid valve is verified in combination with the pressure signal of the working condition monitoring sensor, and the working conditions of the solenoid valve such as normal opening, normal closing, blocking of the moving iron core, and blockage of the water outlet chamber are jointly judged, so that the monitoring results are more accurate and detailed, which is convenient for users to grasp the real-time working condition of the solenoid valve and provides a reliable basis for daily use and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention. Specific embodiments

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0020] like Figure 1 As shown, a control method for a state-monitored solenoid valve of the present invention comprises a solenoid valve body 1, an upper chamber 2 is fixedly installed above the solenoid valve body 1, a junction box 9 is fixedly installed on one side of the upper chamber 2, a power supply is arranged in the junction box 9, a static iron core 3 is placed in the center of the upper chamber 2, an electromagnet coil 4 with the center of the upper chamber 2 as the axis is wound on the static iron core 3, the bottom of the static iron core 3 is fixedly connected to one end of a reset spring 5, the other end of the reset spring 5 extends into a circular hole at the top of a moving iron core 6, the bottom of the moving iron core 6 is fixedly connected to a sealing member 7, the sealing member 7 is used to seal a valve port of a water outlet chamber 8 of the solenoid valve body 1, the water outlet chamber 8 is the water outlet of the solenoid valve body 1, two working condition monitoring sensors 10 symmetrically arranged about the reset spring 5 are also arranged at the bottom of the static iron core 3, and the working condition monitoring sensor 10 is electrically connected to a signal processing module 11;

[0021] When the electromagnet coil 4 is energized, the moving iron core 6 is attracted by the static iron core 3, so that the reset spring 5 is compressed, the working condition monitoring sensor 10 is subjected to the pressure of the moving iron core 6 and generates a pressure signal, and the sealing member 7 is separated from the valve port of the water outlet chamber 8, and the solenoid valve is turned on; on the contrary, after the electromagnet coil 4 loses power, the moving iron core 6 is reset under the elastic force of the reset spring 5, the working condition monitoring sensor 10 is no longer subjected to the pressure of the moving iron core 6, the sealing member 7 presses the valve port of the water outlet chamber 8, and the solenoid valve is closed; in this process, the working condition monitoring sensor 10 is used to collect the pressure signal generated by the pressure of the moving iron core 6, and send the pressure signal to the signal processing module 11, the signal processing module 11 processes the pressure signal to obtain the state information of the solenoid valve, including the opening and closing of the solenoid valve; the pressure signal generated by the working condition monitoring sensor 10 arranged at the bottom of the static iron core 3 received by the signal processing module 11 can accurately and reliably judge whether the moving iron core 6 is attracted, and feedback the opening and closing state of the solenoid valve, thereby avoiding the failure to complete the predetermined control effect due to the failure of the solenoid valve to open normally, and providing a basis for timely maintenance;

[0022] A working condition check sensor 12 is also provided in the water outlet chamber 8 of the solenoid valve body 1. The working condition check sensor 12 is electrically connected to the signal processing module 11. The signal of the working condition check sensor 12 can be used to check the working condition of the solenoid valve. The signal processing module 11 checks the working condition of the solenoid valve according to the water flow pressure signal transmitted by the working condition check sensor 12 and the pressure signal of the working condition monitoring sensor 11, and judges the state information of the solenoid valve, including the working conditions of the solenoid valve being normally opened, normally closed, the moving iron core being blocked, the water outlet chamber being blocked, etc., so that the monitoring result is more accurate and detailed;

[0023] The working condition monitoring sensor 10 and the working condition verification sensor 12 are both resistance strain sensors. The resistance value of the resistance strain sensor changes with the size of the external pressure. The principle is: when the resistance strain sensor is subjected to external pressure, the strain gauge of the resistance strain sensor is compressed and deformed, the cross-sectional area becomes smaller, and the resistance value increases to generate a pressure signal; when the external pressure disappears, the strain gauge of the resistance strain sensor returns to its original state, the resistance value decreases to the original value, and the pressure signal disappears; and the signal processing module 11 obtains the state information of the solenoid valve according to the pressure signal transmitted by the change of the resistance value of the resistance strain sensor;

[0024] When the solenoid valve is normally opened, the working condition check sensor 12 inside the water outlet chamber 8 of the solenoid valve body 1 is impacted by the water flow and generates a pressure signal. The passing water flow pressure makes the resistance value of the working condition check sensor 12 reach the maximum value under the corresponding working condition, that is, the pressure signal at this time is the maximum value corresponding to the normal working condition; when the water outlet chamber 8 of the solenoid valve body 1 is blocked, the water flow cannot pass through or cannot pass through the water outlet chamber 8 under normal working conditions, and the resistance value of the working condition check sensor 12 is lower than the maximum value under normal working conditions, that is, the working condition check sensor 12 is no longer impacted by the water flow or the pressure signal generated by the water flow impact is smaller than the maximum value corresponding to the normal working condition;

[0025] The signal processing module 11 determines the state information of the solenoid valve according to the pressure signal of the working condition monitoring sensor 10 and the water flow pressure signal of the working condition verification sensor 12, and the process is as follows:

[0026] When in use, the electromagnet coil 4, the working condition monitoring sensor 10, the signal processing module 11 and the working condition verification sensor 12 are powered by the power supply in the junction box 9. The signal processing module 11 is a single chip microcomputer, and the single chip microcomputer model can be STC15W4K56S4, which is located at the top of the upper chamber 2; after the electromagnet coil 4 is energized, the static iron core 3 is magnetized, and the moving iron core 6 is attracted to move upward, and the seal 7 at the bottom of the moving iron core 6 is separated from the valve port of the water outlet chamber 8. When the moving iron core 6 hits the working condition monitoring sensor 10 upward, the strain gauge is deformed, so that the resistance cross-sectional area becomes smaller, the resistance value becomes larger, and thus a pressure signal is generated; after the solenoid valve is normally opened, the water flow passing through the water outlet chamber 8 impacts the working condition verification sensor 12, causing the strain gauge to deform, so that the resistance cross-sectional area becomes smaller, the resistance value becomes larger, and the generated water flow pressure signal reaches the maximum value corresponding to the normal working condition, and the working condition monitoring sensor 10 and the resistance strain sensor of the working condition verification sensor 12 transmit the changing pressure signal to the signal processing module 11 through the signal line;

[0027] The signal processing module 11 makes accurate and reliable judgments based on the two sets of signals received to determine the real-time working condition of the solenoid valve: when the working condition monitoring sensor 10 has a pressure signal and the working condition verification sensor 12 has a water flow pressure signal and reaches the maximum value corresponding to the normal working condition, the signal processing module 11 determines and processes the two signals to determine that the solenoid valve is normally open; when the working condition monitoring sensor 10 has a pressure signal and the working condition verification sensor 12 has no water flow pressure signal or the water flow pressure signal is less than the maximum value corresponding to the normal working condition, the signal processing module 11 determines that the water outlet chamber 8 of the solenoid valve body 1 is blocked; when the working condition monitoring sensor 10 has no pressure signal and the working condition verification sensor 12 has a water flow pressure signal, the signal processing module 11 determines that the moving iron core 6 is blocked and the solenoid valve cannot be fully opened or the solenoid valve has leakage and cannot be completely closed; when the working condition monitoring sensor 10 has no pressure signal and the working condition verification sensor 12 has no water flow pressure signal, the signal processing module 11 determines that the solenoid valve is normally closed;

[0028] The signal processing module 11 is also electrically connected to the display, and the display is connected to the power supply of the junction box 9 through a power connection line. The display is an LED display screen, which is used to display the real-time working condition information of the solenoid valve;

[0029] To sum up, the state-monitored solenoid valve receives the pressure signal changes generated by the operating condition monitoring sensor 10 fixedly connected to the bottom of the static iron core 3 and the operating condition verification sensor 12 fixedly connected to the inside of the water outlet chamber 8 through the signal processing module 11, accurately judges the real-time operating condition of the solenoid valve, and effectively solves the problem that the working state of the traditional solenoid valve cannot be monitored. At the same time, it is convenient for users to grasp the real-time operating condition of the solenoid valve, providing a reliable basis for daily use and maintenance.

Claims

1. A control method for a state-monitorable solenoid valve, comprising a solenoid valve body, an upper chamber being fixedly mounted above the solenoid valve body, characterized in that: A static iron core is placed at the center of the upper chamber, an electromagnet coil with the center of the upper chamber as the axis is wound on the static iron core, the bottom of the static iron core is fixedly connected to one end of a reset spring, the other end of the reset spring extends into the circular hole at the top of the moving iron core, the bottom of the moving iron core is fixedly connected to a seal, the seal is used to seal the valve port of the water outlet chamber of the solenoid valve body, and two working condition monitoring sensors symmetrically arranged about the reset spring are also provided at the bottom of the static iron core, and the working condition monitoring sensors are electrically connected to the signal processing module; When the electromagnet coil is energized, the moving iron core is attracted by the static iron core, the reset spring is compressed, and the sealing element is separated from the valve port of the water outlet chamber, and the solenoid valve is turned on. The working condition monitoring sensor is used to collect the pressure signal generated by the pressure of the moving iron core, and send the pressure signal to the signal processing module, and the signal processing module processes the pressure signal to obtain the state information of the solenoid valve; A working condition check sensor is also provided in the water outlet chamber of the solenoid valve body, and the working condition check sensor is electrically connected to the signal processing module. The signal processing module determines the state information of the solenoid valve according to the water flow pressure signal transmitted by the working condition check sensor and the pressure signal of the working condition monitoring sensor; The signal processing module determines the state information of the solenoid valve according to the pressure signal of the working condition monitoring sensor and the water flow pressure signal of the working condition verification sensor, and the process is as follows: when the working condition monitoring sensor has a pressure signal and the working condition verification sensor has a water flow pressure signal and reaches the maximum value corresponding to the normal working condition, the signal processing module determines and processes the two signals to determine that the solenoid valve is normally opened; when the working condition monitoring sensor has a pressure signal and the working condition verification sensor has no water flow pressure signal or the water flow pressure signal is less than the maximum value corresponding to the normal working condition, the signal processing module determines that there is a blockage in the water outlet chamber of the solenoid valve body; when the working condition monitoring sensor has no pressure signal and the working condition verification sensor has a water flow pressure signal, the signal processing module determines that the moving iron core is blocked and the solenoid valve cannot be fully opened or the solenoid valve has leakage and cannot be completely closed; when the working condition monitoring sensor has no pressure signal and the working condition verification sensor has no water flow pressure signal, the signal processing module determines that the solenoid valve is normally closed.

2. The control method of a state-monitorable solenoid valve according to claim 1, characterized in that: The working condition monitoring sensor is a resistance strain sensor, and its resistance value changes with the size of the external pressure; the signal processing module obtains the state information of the solenoid valve according to the pressure signal transmitted by the change of the resistance value of the resistance strain sensor.

3. The control method of a state-monitorable solenoid valve according to claim 1, characterized in that: The operating condition verification sensor is a resistive strain sensor, and its resistance value changes with the magnitude of the external pressure; when the solenoid valve is normally opened, the water flow pressure passing through the water outlet chamber of the solenoid valve body causes the resistance value of the operating condition verification sensor to reach the maximum value under the corresponding operating condition; when the water outlet chamber of the solenoid valve body is blocked, the resistance value of the operating condition verification sensor is lower than the maximum value under normal operating conditions.

4. The control method of a state-monitorable solenoid valve according to claim 1, characterized in that: A junction box is fixedly installed on one side of the upper chamber, and a power supply is arranged in the junction box. The power supply supplies power to the electromagnet coil, the working condition monitoring sensor, the signal processing module and the working condition verification sensor.

5. The control method of a state-monitorable solenoid valve according to claim 1, characterized in that: The signal processing module is a single chip microcomputer.

6. The control method of a state-monitorable solenoid valve according to claim 4, characterized in that: The signal processing module is also electrically connected to the display, and the display is connected to the power supply of the junction box via a power connection line.

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