Contact electromagnetic valve state monitoring device

Abstract

The utility model discloses a contact type electromagnetic valve state monitoring device relates to electromagnetic valve monitoring technical field, and the contact of displacement sensor can be telescopic and is arranged in the electromagnetic valve static iron core inside axial hole, is contacted and triggers for when the displacement of moving iron core subassembly, exports the displacement signal of the displacement position of characteristic moving iron core subassembly. State monitoring module includes signal processing circuit, and its first signal input end electricity is connected to displacement sensor for receiving displacement signal, and the second signal input end electricity is connected to the power supply circuit of electromagnetic valve coil for obtaining the on-off power state signal of characteristic electromagnetic valve coil on-off power state, and the signal output end is used for outputing the feedback signal of characteristic electromagnetic valve action state. Signal processing circuit is based on the level state of displacement signal and on-off power state signal, and generates the feedback signal containing the information of characteristic action normal or abnormal state through hardware logic circuit. Real -time monitoring electromagnetic valve's working condition, improves electromagnetic valve operation's reliability and security.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve monitoring technology, specifically to a contact-type electromagnetic valve status monitoring device. Background Technology

[0002] Solenoid valves are commonly used fluid control components, widely applied in industrial automation, fluid control, and mechanical equipment. Traditional solenoid valves mainly consist of a valve body, a moving iron core assembly, a stationary iron core, and an electromagnetic coil. The valve opens or closes by controlling the displacement of the moving iron core assembly through the switching of the electromagnetic coil on and off.

[0003] With the increasing level of industrial automation, the demand for monitoring the operating status of solenoid valves is growing. Currently, some solenoid valve products with status monitoring functions are available on the market. For example, CN211175573U discloses a solenoid valve with monitorable status, which has two condition monitoring sensors symmetrically positioned about the return spring at the bottom of the stationary iron core. A signal processing module receives and processes the pressure signals from the sensors to determine the real-time operating status of the solenoid valve. CN110630806B discloses a control method for a solenoid valve with monitorable status, employing a similar structural design and using condition monitoring sensors and a signal processing module to monitor the operating status of the solenoid valve.

[0004] CN113944800A discloses a solenoid valve with opening and closing signal feedback, which integrates a pressure sensor within the stationary iron core. The pressure sensor directly contacts the solenoid valve spring to achieve position feedback, resulting in a position feedback response rate at the millisecond level. CN109596052A discloses an electromagnet displacement sensing device, including an electromagnet displacement sensing module, a non-contact displacement detection element, and a control element. The non-contact displacement detection element detects the displacement of the electromagnet core, obtains the electromagnet's state, and controls the electromagnet's on / off state.

[0005] In addition, CN214500051U discloses a novel solenoid valve, which has a central through hole on the stationary iron core and the stud. The moving iron core connecting rod passes through the central through hole of the stationary iron core and is inserted into the central through hole of the stud. A button-type mechanical feedback component is fixed at the upper end of the central through hole of the stud. The signal of the valve opening is transmitted to the terminal through the button-type mechanical feedback component.

[0006] However, existing solenoid valve status monitoring technologies still have some shortcomings: First, most traditional solenoid valves do not monitor their operating status, making it impossible to understand the valve's operation in real time; second, although some solenoid valves are equipped with indicator lights, these lights only reflect whether the solenoid valve coil is energized, and cannot confirm whether the moving iron core assembly is properly engaged when the solenoid valve is energized, or whether it is properly reset when de-energized; third, the lack of direct monitoring of the position and status of the solenoid valve's moving iron core assembly makes it difficult to accurately determine whether the solenoid valve is operating as expected; fourth, existing monitoring methods are often complex in structure, inconvenient to install, and their reliability needs improvement; finally, when a valve malfunctions, it is impossible to immediately determine whether the malfunction is caused by abnormal solenoid valve operation, increasing the difficulty and time cost of troubleshooting.

[0007] Therefore, there is an urgent need for a solenoid valve status monitoring device that is simple in structure, easy to install, and highly reliable, capable of simultaneously monitoring the on / off state of the solenoid valve coil and the displacement position of the moving iron core assembly, accurately determining the working status of the solenoid valve, promptly detecting abnormalities, and improving the reliability and maintenance efficiency of the system. Utility Model Content

[0008] The technical problem this utility model aims to solve is to address the shortcomings of existing solenoid valves, namely, the lack of monitoring of the solenoid valve's status; although some solenoid valves are equipped with working indicator lights, these lights can only reflect whether the solenoid valve coil is energized, but cannot indicate whether the moving iron core assembly is engaged when the solenoid valve is energized, or whether the moving iron core assembly is reset when de-energized; without monitoring the position and status of the moving iron core assembly, it is impossible to accurately determine whether the solenoid valve has actuated; it is impossible to determine whether the solenoid valve is working properly; and when a valve malfunctions, it is impossible to immediately determine whether the malfunction is caused by abnormal solenoid valve operation.

[0009] To address the aforementioned technical problems, this utility model provides a contact-type solenoid valve status monitoring device, comprising: a displacement sensor, the contact of which is retractably disposed in an axial channel inside the stationary iron core of the solenoid valve, for being contacted and triggered when the moving iron core assembly is displaced, and outputting a displacement signal characterizing the displacement position of the moving iron core assembly; a status monitoring module, including a signal processing circuit; the status monitoring module having a first signal input terminal electrically connected to the displacement sensor for receiving the displacement signal; the status monitoring module having a second signal input terminal electrically connected to the power supply line of the solenoid valve coil for acquiring an on / off status signal characterizing the on / off state of the solenoid valve coil; the status monitoring module having a signal output terminal for outputting a feedback signal characterizing the operating state of the solenoid valve; the signal processing circuit being configured to generate the feedback signal through hardware logic circuitry based on the level states of the displacement signal and the on / off status signal; the feedback signal at least includes status information characterizing normal or abnormal operation.

[0010] Preferably, the displacement sensor is a contact mechanical sensor, which is detachably installed in the axial channel of the solenoid valve stationary iron core through a threaded structure.

[0011] Furthermore, the extension and retraction direction of the contact of the displacement sensor is parallel to the movement direction of the moving iron core assembly. When the contact is compressed, the moving iron core assembly is at its minimum stroke position, and when the contact is extended, the moving iron core assembly is at its maximum stroke position.

[0012] Furthermore, the logic implemented by the signal processing circuit is as follows: when the displacement signal indicates that the moving iron core assembly is at its minimum stroke position and the on / off state signal indicates that the coil is energized, a feedback signal indicating that the moving iron core is normally engaged is generated; when the displacement signal indicates that the moving iron core assembly is at its maximum stroke position and the on / off state signal indicates that the coil is de-energized, a feedback signal indicating that the moving iron core is normally reset is generated; when the displacement signal and the on / off state signal do not satisfy any of the above combinations, a feedback signal indicating abnormal operation is generated. The logic is implemented by hardware logic circuit.

[0013] Optionally, the hardware logic circuit includes an AND gate logic circuit for performing an AND operation between the displacement signal and the power-on / off state signal.

[0014] Preferably, the status monitoring module integrates a communication interface circuit, which is connected to the signal output terminal and is used to convert the feedback signal into at least one of an active switch signal, an RS485 signal, a HART signal, or a LoRa wireless signal.

[0015] Furthermore, it also includes a housing and a valve body disposed at the lower end of the housing. The stationary iron core, coil and status monitoring module are installed inside the housing. The housing is provided with an interface for connecting an external cable. The moving iron core assembly is mechanically connected to a return spring.

[0016] Optionally, the displacement sensor is adapted to a solenoid valve with a stationary iron core diameter ≥ 16 mm, and the maximum stroke range of its contacts covers the full working displacement range of the moving iron core assembly.

[0017] Compared with the prior art, the present invention achieves the following beneficial technical effects:

[0018] By incorporating a contact sensor within the stationary iron core of the solenoid valve to monitor the position of the moving iron core assembly in real time, real-time monitoring of the solenoid valve is achieved. The built-in monitoring module determines whether the solenoid valve's operation is normal based on the monitored position information and the commands currently received by the solenoid valve. When the solenoid valve malfunctions, the monitoring module can promptly provide alarm information, enabling rapid troubleshooting. In case of valve malfunction, the feedback information from the solenoid valve can be used to eliminate whether the malfunction is caused by abnormal solenoid valve operation. The contact sensor used features low failure rate, long lifespan, and fast response time, with an operating life of over 5 million cycles, a response time of up to 50ms, and a repeatability of 0.001mm, ensuring the reliability and accuracy of the monitoring device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the contact-type solenoid valve status monitoring device of this utility model.

[0020] Figure 2 yes Figure 1 A cross-sectional view of section AA in the middle.

[0021] Figure 3 This is a side view of the contact-type solenoid valve status monitoring device of this utility model.

[0022] Figure 4 yes Figure 3 A sectional view of section BB in the middle.

[0023] Figure 5 This is a system block diagram of this utility model.

[0024] Figure 6 This is a wiring diagram illustrating the working principle of this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0026] like Figures 1 to 6 As shown, this utility model provides a contact-type solenoid valve status monitoring device, which includes a valve body 1, a moving iron core assembly 2, a stationary iron core 3, a coil 4, a displacement sensor 5, a housing 6, and a status monitoring module 7.

[0027] Reference Figure 2The valve body 1 is located at the lower end of the device, and the moving iron core assembly 2 can move axially within the valve body 1. The stationary iron core 3 is fixedly installed inside the housing 6, and the coil 4 is wrapped around the outside of the stationary iron core 3. The moving iron core assembly 2 is mechanically connected to the return spring 2-1, which is used to push the moving iron core assembly 2 back to the maximum stroke position when the coil 4 is de-energized.

[0028] The stationary iron core 3 has an axial channel inside, and the displacement sensor 5 is retractably installed in this axial channel. The displacement sensor 5 is a contact-type mechanical sensor, which is detachably installed in the axial channel of the stationary iron core 3 via a threaded structure. Figure 4 As shown, the extension and retraction direction of the contact of displacement sensor 5 is parallel to the movement direction of moving iron core assembly 2. When the contact is compressed, the moving iron core assembly 2 is at its minimum stroke position, and when the contact is extended, the moving iron core assembly 2 is at its maximum stroke position. Displacement sensor 5 is compatible with solenoid valves with a stationary iron core diameter ≥ 16mm, and the maximum stroke range of its contact covers the entire working displacement range of moving iron core assembly 2.

[0029] The status monitoring module 7 is installed inside the housing 6 and includes a signal processing circuit. The status monitoring module 7 has a first signal input terminal, which is electrically connected to the displacement sensor 5 to receive a displacement signal A characterizing the displacement position of the moving iron core assembly 2. The status monitoring module 7 also has a second signal input terminal, which is electrically connected to the power supply line of the solenoid valve coil 4 to acquire an on / off status signal B characterizing the on / off state of the solenoid valve coil 4. The status monitoring module 7 has a signal output terminal for outputting a feedback signal characterizing the operating state of the solenoid valve.

[0030] like Figure 5 As shown, the signal processing circuit is configured to generate a feedback signal based on the level states of the displacement signal A and the on / off state signal B through hardware logic circuitry. This feedback signal contains at least state information indicating whether the operation is normal or abnormal. The logic implemented by the signal processing circuit is as follows: when the displacement signal A indicates that the moving iron core assembly 2 is at its minimum stroke position and the on / off state signal B indicates that the coil 4 is energized, a feedback signal indicating normal engagement of the moving iron core is generated; when the displacement signal A indicates that the moving iron core assembly 2 is at its maximum stroke position and the on / off state signal B indicates that the coil 4 is de-energized, a feedback signal indicating normal reset of the moving iron core is generated; when the displacement signal A and the on / off state signal B do not satisfy any of the above combinations, a feedback signal indicating abnormal operation is generated. This logic is implemented by hardware logic circuitry.

[0031] The hardware logic circuit includes AND gates to perform an AND operation between the displacement signal A and the on / off state signal B. In this way, the device can monitor the operating status of the solenoid valve in real time and promptly detect any abnormalities.

[0032] The status monitoring module 7 integrates a communication interface circuit, which is connected to the signal output terminal to convert the feedback signal into at least one of the following outputs: active switching signal, RS485 signal, HART signal, or LoRa wireless signal. Figure 6 As shown, these signals can be transmitted to an external control system through an interface provided on housing 6 for connecting external cables.

[0033] In practical applications, when the solenoid valve coil 4 is energized, the generated electromagnetic force attracts the moving iron core assembly 2 towards the stationary iron core 3, compressing the contacts of the displacement sensor 5. The displacement sensor 5 outputs a displacement signal A indicating that the moving iron core assembly 2 is at its minimum stroke position. Simultaneously, the status monitoring module 7 acquires the on / off status signal B, indicating that the coil 4 is energized, through the second signal input terminal. Based on these two signals, the signal processing circuit uses an AND gate logic circuit to determine whether the moving iron core is properly engaged and generates a corresponding feedback signal.

[0034] When the solenoid valve coil 4 is de-energized, the reset spring 2-1 pushes the moving iron core assembly 2 back to its maximum stroke position. The contact of the displacement sensor 5 extends, outputting a displacement signal A indicating that the moving iron core assembly 2 is at its maximum stroke position. The status monitoring module 7 acquires the on / off status signal B, indicating that the coil 4 is de-energized, through the second signal input terminal. The signal processing circuit determines whether the moving iron core reset is normal based on these two signals and generates a corresponding feedback signal.

[0035] This design enables the device to monitor the solenoid valve's operating status in real time, promptly detecting abnormalities such as valve jamming or coil malfunction, thus improving system reliability and safety. Furthermore, the use of a contact-type mechanical sensor results in a simple and reliable structure, making it suitable for various industrial environments and easy to install and maintain.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A contact-type solenoid valve status monitoring device, characterized in that, include: The displacement sensor (5) has its contacts retractably disposed in the axial channel inside the stationary iron core (3) of the solenoid valve, and is used to be contacted and triggered when the moving iron core assembly (2) is displaced, and outputs a displacement signal (A) characterizing the displacement position of the moving iron core assembly (2); The status monitoring module (7) includes a signal processing circuit; the status monitoring module (7) has a first signal input terminal, which is electrically connected to the displacement sensor (5) for receiving the displacement signal (A); the status monitoring module (7) has a second signal input terminal, which is electrically connected to the power supply line of the solenoid valve coil (4) for acquiring the on / off status signal (B) characterizing the on / off state of the solenoid valve coil (4); The status monitoring module (7) has a signal output terminal for outputting a feedback signal characterizing the action status of the solenoid valve; The signal processing circuit is configured to generate the feedback signal through hardware logic circuitry based on the level states of the displacement signal (A) and the power-on / off state signal (B); the feedback signal at least contains state information characterizing whether the action is normal or abnormal.

2. The contact-type solenoid valve status monitoring device according to claim 1, characterized in that, The displacement sensor (5) is a contact mechanical sensor, which is detachably installed in the axial channel of the solenoid valve stationary iron core (3) through a threaded structure.

3. The contact-type solenoid valve status monitoring device according to claim 1 or 2, characterized in that, The extension and retraction direction of the contact of the displacement sensor (5) is parallel to the movement direction of the moving iron core assembly (2). When the contact is compressed, the moving iron core assembly (2) is at its minimum stroke position, and when the contact is extended, the moving iron core assembly (2) is at its maximum stroke position.

4. The contact-type solenoid valve status monitoring device according to claim 1, characterized in that, The logic implemented by the signal processing circuit is as follows: When the displacement signal (A) indicates that the moving iron core assembly (2) is at its minimum stroke position and the on / off state signal (B) indicates that the coil (4) is energized, a feedback signal indicating that the moving iron core is properly engaged is generated. When the displacement signal (A) indicates that the moving iron core assembly (2) is at its maximum stroke position and the on / off state signal (B) indicates that the coil (4) is de-energized, a feedback signal indicating that the moving iron core is reset normally is generated. When the displacement signal (A) and the power on / off state signal (B) do not satisfy any of the above combinations, a feedback signal characterizing the abnormal action is generated. The logic is implemented by hardware logic circuits.

5. The contact-type solenoid valve status monitoring device according to claim 4, characterized in that, The hardware logic circuit includes an AND gate logic circuit for performing an AND operation between the displacement signal (A) and the power-on / off state signal (B).

6. The contact-type solenoid valve status monitoring device according to claim 1, characterized in that, The status monitoring module (7) integrates a communication interface circuit, which is connected to the signal output terminal and is used to convert the feedback signal into at least one of the following outputs: active switch signal, RS485 signal, HART signal or LoRa wireless signal.

7. The contact-type solenoid valve status monitoring device according to claim 1, characterized in that, It also includes a housing (6) and a valve body (1) disposed at the lower end of the housing (6). The stationary iron core (3), coil (4) and status monitoring module (7) are installed inside the housing (6). The housing (6) is provided with an interface for connecting an external cable. The moving iron core assembly (2) is mechanically connected to the reset spring (2-1).

8. The contact-type solenoid valve status monitoring device according to claim 1, characterized in that, The displacement sensor (5) is adapted to a solenoid valve with a stationary iron core diameter ≥ 16 mm, and the maximum stroke range of its contact covers the full working displacement range of the moving iron core assembly (2).

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