Electric control stop valve

Abstract

The utility model discloses an electric control stop valve, belongs to the technical field of stop valves, and solves the problems that the performance of the electric control stop valve is degraded and even a system fails due to performance reduction caused by turn-to-turn short circuit and aging of a coil in the working process of the electric control stop valve. Comprising a valve body, an electromagnetic coil arranged on the valve body and a monitoring protection circuit coupled with the electromagnetic coil, and the monitoring protection circuit monitors turn-to-turn short circuit and overheating states of the electromagnetic coil in real time and triggers and cuts off power connection of the electromagnetic coil after a fault is confirmed. When the stop valve works, the turn-to-turn short circuit and overheating state of the coil of the electric control stop valve can be monitored in real time, and the relay is immediately triggered to cut off the main power supply of the electromagnetic coil after a fault is confirmed, so that the performance reduction caused by the turn-to-turn short circuit and aging of the coil in the working process of the electric control stop valve is avoided; finally, the valve performance is degraded and even the system breaks down.

Description

Technical Field

[0001] This utility model relates to the field of shut-off valve technology, and in particular to an electrically controlled shut-off valve. Background Technology

[0002] An electrically controlled shut-off valve is a type of valve that uses an energized electromagnetic coil to control the opening and closing of the valve core. Its main components include the valve body, valve cover, valve core, valve stem, and electromagnetic coil. When the coil is energized, the valve core is attracted, allowing media flow; when the power is off, the valve core resets, cutting off media flow. It offers advantages such as precise control, high automation, and rapid response, enabling remote control and programmed operation. It has a wide range of applications, adapting to different fluid media, temperature, and pressure conditions, and is widely used in industrial automation, chemical, pharmaceutical, and water treatment fields to precisely control the flow of media in pipelines and ensure the stable operation of production processes.

[0003] However, during operation, the performance of the electrically controlled shut-off valve deteriorates due to short circuits between coil turns and aging, ultimately leading to valve performance degradation or even system failure.

[0004] Therefore, an electrically controlled shut-off valve is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing an electrically controlled shut-off valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An electrically controlled shut-off valve includes a valve body, an electromagnetic coil mounted on the valve body, and a monitoring and protection circuit coupled to the electromagnetic coil. The monitoring and protection circuit monitors the inter-turn short circuit and overheating status of the electromagnetic coil in real time and triggers the disconnection of the electromagnetic coil after confirming a fault.

[0008] Preferably, the monitoring and protection circuit includes a power supply module, a resistance monitoring module, a temperature monitoring module, a logic control module, and an execution module. The input terminal of the power supply module is connected to an external 24VDC power supply. The first output terminal of the power supply module provides a constant current reference voltage to the resistance monitoring module. The second output terminal of the power supply module provides a bridge power supply to the temperature monitoring module. The third output terminal of the power supply module provides an operating voltage to the logic control module. The current injection terminal of the resistance monitoring module is connected to the first terminal of the electromagnetic coil. The sampling terminal of the resistance monitoring module is connected between the second terminal of the electromagnetic coil and the ground wire. The signal output terminal of the resistance monitoring module is connected to the first input terminal of the logic control module. The temperature sensing terminal of the temperature monitoring module is mounted on the electromagnetic coil. The signal output terminal of the temperature monitoring module is connected to the second input terminal of the logic control module. The drive output terminal of the logic control module is connected to the control terminal of the execution module. The power input terminal of the execution module is connected to the positive terminal of the 24VDC power supply. The controlled output terminal of the execution module is connected in series in the power supply circuit of the electromagnetic coil.

[0009] Preferably, the power supply module includes an LM7812 three-terminal regulator, a first filter capacitor, and a second filter capacitor. The input terminal of the LM7812 three-terminal regulator is connected to an external 24VDC power supply, the ground terminal of the LM7812 three-terminal regulator is grounded, and the output terminal of the LM7812 three-terminal regulator outputs a 12V voltage. The positive terminal of the first filter capacitor is connected to the input terminal of the LM7812 three-terminal regulator, and the negative terminal of the first filter capacitor is grounded. The second filter capacitor is connected in parallel between the output terminal of the LM7812 three-terminal regulator and ground.

[0010] Preferably, the resistance monitoring module includes a REF5050 reference source, an LM334 constant current source, a first resistor, an INA128 instrumentation amplifier, a sampling resistor, a first LM339 voltage comparator, and a first resistor divider circuit. The REF5050 reference source is connected to a 12V voltage at its power input terminal and outputs a 5V reference voltage at its output terminal. The current adjustment terminal of the LM334 constant current source is connected to ground in series with the first resistor. The positive voltage terminal of the LM334 constant current source is connected to the output terminal of the REF5050 reference source. The negative voltage terminal of the LM334 constant current source is connected to the first terminal of the electromagnetic coil. The first input terminal of the INA128 instrumentation amplifier is connected to the first terminal of the electromagnetic coil. The second input terminal of the INA128 instrumentation amplifier is connected to ground in series with the sampling resistor. The non-inverting input terminal of the first LM339 voltage comparator is connected to the output terminal of the INA128 instrumentation amplifier. The inverting input terminal of the first LM339 voltage comparator is connected to the first resistor divider circuit.

[0011] Preferably, the first voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor. One end of the first voltage divider resistor is connected to power, and its other end is connected to one end of the second voltage divider resistor. The other end of the second voltage divider resistor is grounded. The inverting input of the first LM339 voltage comparator is connected between the first voltage divider resistor and the second voltage divider resistor.

[0012] Preferably, the temperature monitoring module includes a thermistor, a Wheatstone bridge, an AD620 instrumentation amplifier, a second resistor divider circuit, and a second LM339 voltage comparator. One end of the thermistor is grounded, and the other end of the thermistor is connected to the Wheatstone bridge. The output of the Wheatstone bridge is connected to the input of the AD620 instrumentation amplifier. The thermistor is connected to the gain input of the AD620 instrumentation amplifier. The output of the AD620 instrumentation amplifier is connected to the non-inverting input of the second LM339 voltage comparator. The non-inverting input of the second LM339 voltage comparator is connected to the second resistor divider circuit.

[0013] Preferably, the second voltage divider circuit includes a third voltage divider resistor and a fourth voltage divider resistor. One end of the third voltage divider resistor is connected to power, and its other end is connected to one end of the fourth voltage divider resistor. The other end of the fourth voltage divider resistor is grounded. The inverting input of the second LM339 voltage comparator is connected between the third voltage divider resistor and the fourth voltage divider resistor.

[0014] Preferably, the logic control module includes a CD4071 OR gate, an NE555 timer, and a ULN2003 driver chip. The two inputs of the CD4071 OR gate are respectively connected to the outputs of a first LM339 voltage comparator and a second LM339 voltage comparator. The output of the CD4071 OR gate outputs a fault signal to the trigger input of the NE555 timer. The output of the NE555 timer is connected to the input of the ULN2003 driver chip. The output of the ULN2003 driver chip outputs a drive signal.

[0015] Preferably, the execution module includes a transistor, a relay, and a relay switch. The base of the transistor is connected to the output terminal of the ULN2003 driver chip, the collector of the transistor is energized, the emitter of the transistor is connected in series with the coil of the relay and then grounded, and the relay switch is connected in series in the power supply circuit of the electromagnetic coil.

[0016] This utility model has the following beneficial effects:

[0017] When the shut-off valve of this invention is in operation, it can monitor the inter-turn short circuit and overheating status of the coil of the electrically controlled shut-off valve in real time, and immediately trigger the relay to cut off the main power supply of the electromagnetic coil after confirming the fault. This avoids the performance degradation of the electrically controlled shut-off valve due to inter-turn short circuit and aging of the coil during operation, which would ultimately lead to valve performance deterioration or even system failure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural block diagram of the present invention.

[0020] In the diagram: 1. Power supply module; 2. Resistance detection module; 3. Temperature monitoring module; 4. Logic control module; 5. Execution module. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] An electrically controlled shut-off valve, such as Figure 1 As shown, it includes a valve body, an electromagnetic coil mounted on the valve body, and a monitoring and protection circuit coupled to the electromagnetic coil. The monitoring and protection circuit monitors the inter-turn short circuit and overheating status of the electromagnetic coil in real time and triggers the disconnection of the electromagnetic coil after confirming the fault.

[0028] The monitoring and protection circuit includes a power supply module 1, a resistance monitoring module, a temperature monitoring module 3, a logic control module 4, and an execution module 5. The input terminal of the power supply module 1 is connected to an external 24VDC power supply. The first output terminal of the power supply module 1 provides a constant current reference voltage to the resistance monitoring module. The second output terminal of the power supply module 1 provides a bridge power supply to the temperature monitoring module 3. The third output terminal of the power supply module 1 provides the operating voltage to the logic control module 4. The current injection terminal of the resistance monitoring module is connected to the first terminal of the electromagnetic coil. The sampling terminal of the resistance monitoring module is connected between the second terminal of the electromagnetic coil and the ground wire. The signal output terminal of the resistance monitoring module is connected to the first input terminal of the logic control module 4. The temperature sensing terminal of the temperature monitoring module 3 is mounted on the electromagnetic coil. The signal output terminal of the temperature monitoring module 3 is connected to the second input terminal of the logic control module 4. The drive output terminal of the logic control module 4 is connected to the control terminal of the execution module 5. The power input terminal of the execution module 5 is connected to the positive terminal of the 24VDC power supply. The controlled output terminal of the execution module 5 is connected in series in the power supply circuit of the electromagnetic coil.

[0029] Power module 1 includes an LM7812 three-terminal regulator, a first filter capacitor, and a second filter capacitor. The input terminal of the LM7812 three-terminal regulator is connected to an external 24VDC power supply. The ground terminal of the LM7812 three-terminal regulator is grounded. The output terminal of the LM7812 three-terminal regulator outputs a 12V voltage. The positive terminal of the first filter capacitor is connected to the input terminal of the LM7812 three-terminal regulator, and the negative terminal of the first filter capacitor is grounded. The second filter capacitor is connected in parallel between the output terminal of the LM7812 three-terminal regulator and ground.

[0030] The resistance monitoring module includes a REF5050 reference source, an LM334 constant current source, a first resistor, an INA128 instrumentation amplifier, a sampling resistor, a first LM339 voltage comparator, and a first resistor voltage divider circuit. The REF5050 reference source is connected to a 12V voltage, and its output is a 5V reference. The current adjustment terminal of the LM334 constant current source is connected to ground in series with the first resistor. The positive voltage terminal of the LM334 constant current source is connected to the output terminal of the REF5050 reference source, and its negative voltage terminal is connected to the first terminal of the electromagnetic coil. The first resistor of the INA128 instrumentation amplifier... The input terminal is connected to the first end of the electromagnetic coil. The second input terminal of the INA128 instrumentation amplifier is connected to ground after being connected in series with a sampling resistor. The non-inverting input terminal of the first LM339 voltage comparator is connected to the output terminal of the INA128 instrumentation amplifier. The inverting input terminal of the first LM339 voltage comparator is connected to the first resistor voltage divider circuit. The first resistor voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor. One end of the first voltage divider resistor is energized, and its other end is connected to one end of the second voltage divider resistor. The other end of the second voltage divider resistor is grounded. The inverting input terminal of the first LM339 voltage comparator is connected between the first voltage divider resistor and the second voltage divider resistor.

[0031] The temperature monitoring module 3 includes a thermistor, a Wheatstone bridge, an AD620 instrumentation amplifier, a second resistor divider circuit, and a second LM339 voltage comparator. One end of the thermistor is grounded, and the other end is connected to the Wheatstone bridge. The output of the Wheatstone bridge is connected to the input of the AD620 instrumentation amplifier. The thermistor is connected to the gain input of the AD620 instrumentation amplifier. The output of the AD620 instrumentation amplifier is connected to the non-inverting input of the second LM339 voltage comparator. The non-inverting input of the second LM339 voltage comparator is connected to the second resistor divider circuit, which includes a third and a fourth voltage divider resistor. One end of the third voltage divider resistor is energized, and its other end is connected to one end of the fourth voltage divider resistor. The other end of the fourth voltage divider resistor is grounded. The inverting input of the second LM339 voltage comparator is connected between the third and fourth voltage divider resistors.

[0032] The first LM339 voltage comparator and the second LM339 voltage comparator mentioned above are two voltage comparators in the LM339 voltage comparator.

[0033] The logic control module 4 includes a CD4071 OR gate, an NE555 timer, and a ULN2003 driver chip. The two inputs of the CD4071 OR gate are connected to the outputs of the first LM339 voltage comparator and the second LM339 voltage comparator, respectively. The output of the CD4071 OR gate outputs a fault signal to the trigger input of the NE555 timer. The output of the NE555 timer is connected to the input of the ULN2003 driver chip, and the output of the ULN2003 driver chip outputs a drive signal.

[0034] The execution module 5 includes a transistor, a relay, and a relay switch. The base of the transistor is connected to the output terminal of the ULN2003 driver chip. The collector of the transistor is energized. The emitter of the transistor is connected in series with the coil of the relay and then grounded. The relay switch is connected in series in the power supply circuit of the electromagnetic coil.

[0035] During the operation of this electrically controlled shut-off valve, the monitoring and protection circuit can perform real-time detection of the electromagnetic coil in the valve.

[0036] When the 24VDC power supply is connected, the LM7812 three-terminal regulator of power module 1 outputs 12V voltage to power each module.

[0037] In the resistance monitoring module, the REF5050 reference source drives the LM334 constant current source to inject a 50mA test current into the electromagnetic coil. The electromagnetic coil current flows through the 0.1Ω sampling resistor to generate a voltage drop. The INA128 instrumentation amplifier amplifies the difference signal and outputs it to the first LM339 voltage comparator. If a short circuit between coil turns causes the resistance to drop beyond the threshold, the first LM339 voltage comparator outputs a high level.

[0038] Meanwhile, the temperature monitoring module 3 uses a thermistor mounted on an electromagnetic coil. As the resistance changes with temperature, the Wheatstone bridge imbalance signal is input to the second LM339 voltage comparator via an AD620 instrumentation amplifier. When the coil temperature exceeds the threshold, the second LM339 voltage comparator outputs a high level.

[0039] When any input of the CD4071 OR gate of logic control module 4 is high, the output triggers the NE555 timer. After a delay confirmation, the NE555 timer outputs a high level to drive the ULN2003 chip, which energizes the transistor and relay coil. After the relay is activated, the relay switch opens and the electromagnetic coil is de-energized.

[0040] This prevents the electromagnetic coil from operating beyond its threshold and avoids damage due to overload.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrically controlled shut-off valve, characterized in that, It includes a valve body, an electromagnetic coil mounted on the valve body, and a monitoring and protection circuit coupled to the electromagnetic coil. The monitoring and protection circuit monitors the inter-turn short circuit and overheating status of the electromagnetic coil in real time and triggers the disconnection of the electromagnetic coil after confirming the fault.

2. The electrically controlled shut-off valve according to claim 1, characterized in that, The monitoring and protection circuit includes a power supply module (1), a resistance monitoring module, a temperature monitoring module (3), a logic control module (4), and an execution module (5). The input terminal of the power supply module (1) is connected to an external 24VDC power supply. The first output terminal of the power supply module (1) provides a constant current reference voltage to the resistance monitoring module. The second output terminal of the power supply module (1) provides a bridge power supply to the temperature monitoring module (3). The third output terminal of the power supply module (1) provides a working voltage to the logic control module (4). The current injection terminal of the resistance monitoring module is connected to the first terminal of the electromagnetic coil. The sampling end of the monitoring module is connected between the second end of the electromagnetic coil and the ground wire. The signal output end of the resistance monitoring module is connected to the first input end of the logic control module (4). The temperature sensing end of the temperature monitoring module (3) is attached to the electromagnetic coil. The signal output end of the temperature monitoring module (3) is connected to the second input end of the logic control module (4). The drive output end of the logic control module (4) is connected to the control end of the execution module (5). The power input end of the execution module (5) is connected to the positive terminal of the 24VDC power supply. The controlled output end of the execution module (5) is connected in series in the power supply circuit of the electromagnetic coil.

3. The electrically controlled shut-off valve according to claim 2, characterized in that, The power module (1) includes an LM7812 three-terminal regulator, a first filter capacitor, and a second filter capacitor. The input terminal of the LM7812 three-terminal regulator is connected to an external 24VDC power supply. The ground terminal of the LM7812 three-terminal regulator is grounded. The output terminal of the LM7812 three-terminal regulator outputs a 12V voltage. The positive terminal of the first filter capacitor is connected to the input terminal of the LM7812 three-terminal regulator, and the negative terminal of the first filter capacitor is grounded. The second filter capacitor is connected in parallel between the output terminal of the LM7812 three-terminal regulator and ground.

4. The electrically controlled shut-off valve according to claim 2, characterized in that, The resistance monitoring module includes a REF5050 reference source, an LM334 constant current source, a first resistor, an INA128 instrumentation amplifier, a sampling resistor, a first LM339 voltage comparator, and a first resistor divider circuit. The REF5050 reference source is connected to a 12V voltage at its power input terminal and outputs a 5V reference voltage at its output terminal. The current adjustment terminal of the LM334 constant current source is connected to ground in series with the first resistor. The positive voltage terminal of the LM334 constant current source is connected to the output terminal of the REF5050 reference source. The negative voltage terminal of the LM334 constant current source is connected to the first terminal of the electromagnetic coil. The first input terminal of the INA128 instrumentation amplifier is connected to the first terminal of the electromagnetic coil. The second input terminal of the INA128 instrumentation amplifier is connected to ground in series with the sampling resistor. The non-inverting input terminal of the first LM339 voltage comparator is connected to the output terminal of the INA128 instrumentation amplifier. The inverting input terminal of the first LM339 voltage comparator is connected to the first resistor divider circuit.

5. The electrically controlled shut-off valve according to claim 4, characterized in that, The first voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor. One end of the first voltage divider resistor is connected to power, and the other end is connected to one end of the second voltage divider resistor. The other end of the second voltage divider resistor is grounded. The inverting input of the first LM339 voltage comparator is connected between the first voltage divider resistor and the second voltage divider resistor.

6. The electrically controlled shut-off valve according to claim 2, characterized in that, The temperature monitoring module (3) includes a thermistor, a Wheatstone bridge, an AD620 instrumentation amplifier, a second resistor divider circuit, and a second LM339 voltage comparator. One end of the thermistor is grounded, and the other end of the thermistor is connected to the Wheatstone bridge. The output of the Wheatstone bridge is connected to the input of the AD620 instrumentation amplifier. The thermistor is connected to the gain input of the AD620 instrumentation amplifier. The output of the AD620 instrumentation amplifier is connected to the non-inverting input of the second LM339 voltage comparator. The non-inverting input of the second LM339 voltage comparator is connected to the second resistor divider circuit.

7. The electrically controlled shut-off valve according to claim 6, characterized in that, The second voltage divider circuit includes a third voltage divider resistor and a fourth voltage divider resistor. One end of the third voltage divider resistor is connected to power, and the other end is connected to one end of the fourth voltage divider resistor. The other end of the fourth voltage divider resistor is grounded. The inverting input of the second LM339 voltage comparator is connected between the third voltage divider resistor and the fourth voltage divider resistor.

8. The electrically controlled shut-off valve according to claim 2, characterized in that, The logic control module (4) includes a CD4071 OR gate, an NE555 timer, and a ULN2003 driver chip. The two input terminals of the CD4071 OR gate are respectively connected to the output terminals of the first LM339 voltage comparator and the second LM339 voltage comparator. The output terminal of the CD4071 OR gate outputs a fault signal to the trigger input terminal of the NE555 timer. The output terminal of the NE555 timer is connected to the input terminal of the ULN2003 driver chip. The output terminal of the ULN2003 driver chip outputs a drive signal.

9. The electrically controlled shut-off valve according to claim 2, characterized in that, The execution module (5) includes a transistor, a relay, and a relay switch. The base of the transistor is connected to the output terminal of the ULN2003 driver chip. The collector of the transistor is energized. The emitter of the transistor is connected in series with the coil of the relay and then grounded. The relay switch is connected in series in the power supply circuit of the electromagnetic coil.

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