WO2021192981A1

WO2021192981A1 - Solenoid valve

Info

Publication number: WO2021192981A1
Application number: PCT/JP2021/009118
Authority: WO
Inventors: 文明青山
Original assignee: 金子産業株式会社
Priority date: 2020-03-27
Filing date: 2021-03-09
Publication date: 2021-09-30
Also published as: JP2021156402A; JP6795233B1

Abstract

[Problem] To provide a solenoid valve capable of monitoring a solenoid unit regardless of the presence or absence of operation of the solenoid unit and realizing correcting maintenance and predictive maintenance. [Solution] A solenoid valve (1) comprises a spool unit (2) that switches a flow path through which air (A) as a driving fluid flows, a solenoid unit (3) that displaces the spool unit (2) in response to an energized state, a third substrate (52) disposed close to the solenoid unit (3), and a magnetic sensor (46) that is placed on the third substrate (52) and measures a magnetic strength generated by the solenoid unit (3). The solenoid valve (1) further comprises an abnormality determination unit (701) that determines whether an abnormality has occurred in the solenoid unit (3) on the basis of the magnetic strength measured by the magnetic sensor (46).

Description

solenoid valve

The present invention relates to a solenoid valve and a fluid pressure drive valve.

Conventionally, various methods and means for diagnosing an abnormality as to whether or not an abnormality has occurred in a solenoid valve are known. For example, in Patent Document 1, in a solenoid valve including a vibration sensor that detects vibration of a solenoid portion generated by the operation of a movable iron core and driving of a valve body, the solenoid portion detected by the vibration sensor when the solenoid portion operates. It is disclosed that an abnormality diagnosis of a solenoid valve is performed in response to vibration.

Japanese Unexamined Patent Publication No. 2005-273835

In order to improve the operating rate and reliability of the solenoid valve and various systems to which the solenoid valve is applied, not only post-maintenance to grasp the abnormality when an abnormality occurs, but also a sign to grasp the sign of the abnormality. It is desired to realize maintenance. However, as described above, the solenoid valve disclosed in Patent Document 1 detects the vibration generated by the operation of the solenoid portion by the vibration sensor. Therefore, in the solenoid valve, it is required to operate the solenoid part as a condition for performing an abnormality diagnosis, so that the solenoid part is not operated (the solenoid part is operated at the request of the system to which the solenoid valve is applied). Abnormal diagnosis cannot be performed in situations where it cannot operate. Further, with the solenoid valve, it is not possible to monitor the change over time that occurs in the solenoid portion when the situation in which the solenoid portion is not operated continues, and it is also difficult to realize predictive maintenance. rice field.

The present invention has been made in view of such circumstances, and it is possible to monitor the solenoid unit regardless of the presence or absence of operation of the solenoid unit, and to realize post-mortem maintenance and predictive maintenance. It is an object of the present invention to provide a solenoid valve and a fluid pressure driven valve that enable it.

The present invention solves the above problems, and the solenoid valve according to the embodiment of the present invention is
A spool part that switches the flow path through which the drive fluid flows, and
A solenoid part that displaces the spool part according to the energized state, and
A substrate arranged close to the solenoid portion and
It is mounted on the substrate and includes a magnetic sensor that measures the strength of the magnetism generated by the solenoid unit.

Further, the fluid pressure drive valve according to the embodiment of the present invention is
With the above solenoid valve
Main valve and
A drive device for opening and closing the main valve by driving the valve shaft connected to the main valve according to the fluid pressure of the driving fluid is provided.
The solenoid valve is
It has a function of controlling the supply and discharge of the driving fluid to the driving device.

According to the solenoid valve and the fluid pressure drive valve according to the embodiment of the present invention, the substrate is arranged close to the solenoid portion, and the magnetic sensor is mounted on the substrate to generate the solenoid portion. Measure the strength of the magnetism.

Here, when the solenoid valve is operating normally without any abnormality, the magnetic strength to be measured by the magnetic sensor is, for example, the specification of the solenoid part (number of turns and dimensions of the solenoid coil). ), A value that can be calculated in advance according to the set current value of the coil current, the positional relationship between the solenoid unit and the magnetic sensor, etc. (design magnetic strength (a value having a predetermined width may be used)). Therefore, for example, the magnetic sensor measures the magnetic strength (measured magnetic strength) generated by the solenoid portion that is energized at a predetermined sampling cycle, and compares the measured magnetic strength with the above-mentioned design magnetic strength. By doing so, it becomes possible to detect an abnormality or a sign of the abnormality of the solenoid valve.

In addition, when the solenoid valve is operating normally without any abnormality, the magnetic strength to be measured by the magnetic sensor before and after switching between the energized state and the non-energized state of the solenoid part is It is assumed that when switching from the non-energized state to the energized state, the magnetic strength increases from zero to the design magnetic strength, and when switching from the energized state to the non-energized state, the design magnetic strength decreases to zero. Therefore, the magnetic field sensor measures the magnetic strength (measured magnetic strength) generated by the solenoid part before and after switching between the energized state and the non-energized state of the solenoid part, and the measured magnetic strength changes according to the above assumption ( By confirming whether or not the solenoid valve is rising or falling, it is possible to detect an abnormality in the solenoid valve.

Therefore, since the solenoid valve and the fluid pressure drive valve are equipped with a magnetic sensor, the solenoid part can be monitored regardless of the presence or absence of operation of the solenoid part, and post-maintenance maintenance and predictive maintenance can be realized.

It is sectional drawing which shows an example of the fluid pressure drive valve 10 which concerns on embodiment of this invention. It is sectional drawing which shows an example of the solenoid valve 1 which concerns on embodiment of this invention. It is a block diagram which shows an example of the solenoid valve 1 which concerns on embodiment of this invention. It is a schematic diagram which shows the mounting example of a plurality of sensors 4 on the substrate 5 which concerns on embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

(Embodiment)
FIG. 1 is a cross-sectional view showing an example of a fluid pressure drive valve 10 according to an embodiment of the present invention.

The fluid pressure drive valve 10 opens and closes the main valve 11 by driving the main valve 11 arranged in the middle of the pipe 100 and the valve shaft 13 connected to the main valve 11 according to the fluid pressure of the driving fluid. The drive device 12 is provided, and the solenoid valve 1 having a function of controlling the supply and discharge of the drive fluid to the drive device 12 is provided.

The fluid pressure drive valve 10 is installed in, for example, a pipe 100 through which various gases, oil, etc. flow in the plant equipment, and is an emergency shutoff for shutting off the flow of the pipe 100 in the event of an emergency stop such as when an abnormality occurs in the plant equipment. Used as a valve. The installation location and application of the fluid pressure drive valve 10 are not limited to the above examples.

Air (air) A is supplied to the fluid pressure drive valve 10 from the air supply source 14 as an example of the drive fluid, and the air A from the air supply source 14 is passed through the first air pipe 140. Is supplied to the electromagnetic valve 1 and further supplied to the drive device 12 via the second air pipe 141. Further, the fluid pressure drive valve 10 includes a communication cable 150 for transmitting and receiving various data between the external device 15 and the solenoid valve 1, and a power cable 160 for supplying electric power from the external power supply 16 to the solenoid valve 1. And are connected. The driving fluid is not limited to the above-mentioned air A, and may be another gas or a liquid (for example, oil).

The external device 15 is composed of, for example, a computer for plant management (including a local server and a cloud server), a diagnostic computer used by a maintenance inspector, or an external storage unit such as a USB memory or an external HDD. There is. The communication between the external device 15 and the solenoid valve 1 may be wireless communication.

In the present embodiment, the fluid pressure drive valve 10 adopts an airless closing method. Therefore, during steady operation, the main valve 11 is fully opened by supplying air A (air supply) from the air supply source 14 to the drive device 12 via the solenoid valve 1, and during emergency stop or test operation. By discharging air A (exhaust) from the drive device 12 via the solenoid valve 1, the main valve 11 is fully closed. The fluid pressure drive valve 10 may adopt an airless open system. In that case, the fluid pressure drive valve 10 is fully opened by supplying the air A to the drive device 12, and the air A is discharged from the drive device 12. The main valve 11 may be fully closed.

The main valve 11 is composed of, for example, a valve called a ball valve. As a configuration example thereof, the main valve 11 includes a valve box 110 arranged in the middle of the pipe 100 and a ball-shaped valve body 111 rotatably provided in the valve box 110, and is provided on the upper portion of the valve body 111. Is connected to the first end 130A of the valve shaft 13. The valve body 111 rotates in the valve box 110 in response to the valve shaft 13 being rotationally driven from 0 degrees to 90 degrees, and the main valve 11 can be switched between a fully open state (state shown in FIG. 1) and a fully closed state. .. The valve used as the main valve 11 is not limited to the ball valve, and may be another type such as a butterfly valve.

The drive device 12 is arranged between the main valve 11 and the solenoid valve 1, for example, and is configured as a single-actuated air cylinder mechanism. As a configuration example thereof, the drive device 12 includes a cylindrical cylinder 120, a pair of

pistons

122A and 122B provided in the cylinder so as to be reciprocally linearly movable, and connected via a piston rod 121, and a first piston 122A. A coil spring 123 provided on the side, an air supply / discharge port 124 formed on the second piston 122B side, a valve shaft 13 and a piston rod 121 arranged so as to penetrate the cylinder 120 along the radial direction. It is provided with a transmission mechanism 125 provided at a portion where the cylinders are orthogonal to each other. The drive device 12 is not limited to the single-acting type, and may be configured in another form such as a double-acting type.

The first piston 122A is urged by the coil spring 123 in the direction of closing the main valve 11. The second piston 122B is pressed by the air A (air supply) supplied from the air supply / exhaust port 124 in the direction of opening the main valve 11 against the urging force of the coil spring 123. The transmission mechanism 125 is composed of, for example, a rack and pinion mechanism, a link mechanism, a cam mechanism, etc., and converts the reciprocating linear motion of the piston rod 121 into a rotary motion and transmits it to the valve shaft 13.

The valve shaft 13 is formed in a shaft shape and is arranged so as to penetrate the drive device 12 in a rotatable state. The first end 130A of the valve shaft 13 is connected to the main valve 11, and the second end 130B of the valve shaft 13 is pivotally supported by the solenoid valve 1. The valve shaft 13 may have a plurality of shafts connected by, for example, a coupling or the like.

The solenoid valve 1 has a function of controlling the supply and discharge of air A to the drive device 12, and is, for example, a three-way solenoid valve of a normally closed type (“open” when energized, “closed” when not energized) at two positions. It is configured as. The solenoid valve 1 has a spool portion 2 that switches the flow path through which the air A flows inside the accommodating portion 6 that functions as a housing of the indoor type or explosion-proof type solenoid valve 1, and is in an energized state (when energized or de-energized). It is provided with a solenoid unit 3 that displaces the spool unit 2 accordingly. The solenoid valve 1 is not limited to a two-position, normally closed type three-way solenoid valve, but may be a three-position solenoid valve, a normally open type, a four-way solenoid valve, or the like, and is composed of various formations based on any combination. May be. Further, in the present embodiment, the solenoid valve 1 is used as a pilot valve in the fluid pressure drive valve 10, but the application of the solenoid valve 1 is not limited to this.

The spool portion 2 has an input port 20 connected to the air supply source 14 via the first air pipe 140, an output port 21 connected to the drive device 12 via the second air pipe 141, and a drive device. The exhaust port 22 for discharging the exhaust from the 12 is provided.

The solenoid unit 3 displaces the spool unit 2 so as to communicate between the input port 20 and the output port 21 when energized, and communicates between the output port 21 and the exhaust port 22 when the power is off. , Displace the spool portion 2.

Therefore, when the solenoid valve 1 is energized, the air A (air supply) from the air supply source 14 is the first air pipe 140, the input port 20, the output port 21, and the second air pipe 141. The second piston 122B is pressed and the coil spring 123 is compressed by flowing in this order and being supplied to the air supply / discharge port 124. Then, when the valve shaft 13 is rotationally driven via the piston rod 121 and the transmission mechanism 125 by the amount that the piston rod 121 moves in response to the compression of the coil spring 123, the valve body 111 rotates in the valve box 110. The main valve 11 is operated in the fully open state.

On the other hand, when the solenoid valve 1 is in the non-energized state, the air A (exhaust) in the cylinder 120 flows from the air supply / exhaust port 124 to the second air pipe 141, the output port 21, and the exhaust port 22 in this order. By being discharged to the outside air, the pressing force of the second piston 122B is reduced, and the coil spring 123 is restored from the compressed state. Then, when the valve shaft 13 is rotationally driven via the transmission mechanism 125 by the amount that the piston rod 121 moves in response to the restoration of the coil spring 123, the valve body 111 rotates in the valve box 110, and the main valve 11 rotates. It is operated in the fully closed state.

(About the configuration of the solenoid valve)
FIG. 2 is a cross-sectional view showing an example of the solenoid valve 1 according to the embodiment of the present invention.

In addition to the spool portion 2 and the solenoid portion 3 described above, the solenoid valve 1 includes a plurality of sensors 4 for acquiring the state of each portion of the solenoid valve 1 and a substrate 5 on which at least one of the plurality of sensors 4 is mounted. A spool portion 2, a solenoid portion 3, a plurality of sensors 4, and an accommodating portion 6 for accommodating the substrate 5 are provided.

The accommodating portion 6 is adjacent to the first accommodating portion 60 accommodating the spool portion 2 and the first accommodating portion 60, and also accommodates the solenoid unit 3, the plurality of sensors 4, and the substrate 5. A terminal box 62 to which the communication cable 150 and the power cable 160 are connected is provided. The first accommodating portion 60 and the second accommodating portion 61 are made of, for example, a metal material such as aluminum.

The first accommodating portion 60 has openings (not shown) that function as input ports 20, output ports 21, and exhaust ports 22, respectively.

The second accommodating portion 61 includes a cylindrical housing 610 with both ends (first housing end 610a and second housing end 610b) open, a body 611 arranged inside the housing 610, and a second housing portion 61. A solenoid cover 612 that covers the solenoid portion 3 fixed to the housing end portion 610a of 1 from the outside air, and a terminal box cover 613 that covers the terminal box 62 fixed to the second housing end portion 610b from the outside air are provided.

The housing 610 has a shaft insertion port 610c formed in the lower portion thereof and into which the second end 130B of the valve shaft 13 is inserted, a body insertion port 610d formed in the upper portion thereof into which the body 611 is inserted, and a second. It has a cable insertion port 610e formed on the housing end portion 610b side of the above and into which the communication cable 150 and the power cable 160 are inserted.

The first accommodating portion 60 and the second accommodating portion 61 are branched from the input side flow path 26 so as to penetrate the body 611, and between the input side flow path 26 and the first pressure sensor 40. A first flow path 63 that communicates, a second flow path 64 that branches from the output side flow path 27 and communicates between the output side flow path 27 and the second pressure sensor 41, a spool portion 2 and a solenoid. A spool flow path 65 through which air A for interlocking with the portion 3 flows is formed.

The spool portion 2 includes a spool hole 23 formed in a second accommodating portion 61 that functions as a spool case, a spool valve 24 that is movably arranged in the spool hole 23, and a spool that urges the spool valve 24. The spring 25, the input side flow path 26 communicating between the input port 20 and the spool hole 23, the output side flow path 27 communicating between the output port 21 and the spool hole 23, the exhaust port 22 and the spool hole 23. It is provided with an exhaust flow path 28 that communicates between the two.

The solenoid unit 3 is arranged in a solenoid case 30, a solenoid coil 31 housed in the solenoid case 30, a movable iron core 32 movably arranged in the solenoid coil 31, and a fixed state in the solenoid coil 31. A fixed iron core 33 and a solenoid spring 34 for urging the movable iron core 32 are provided.

When the solenoid valve 1 is switched from the non-energized state to the energized state, the solenoid coil 31 generates an electromagnetic force when the coil current flows through the solenoid coil 31 in the solenoid unit 3, and the movable iron core is generated by the electromagnetic force. When the 32 is sucked into the fixed iron core 33 against the urging force of the solenoid spring 34, the flow state of the air A flowing through the spool flow path 65 is switched. Then, in the spool portion 2, the flow state of the air A flowing through the spool flow path 65 is switched, so that the spool valve 24 is moved against the urging force of the spool spring 25, so that the input port 20 and the exhaust are exhausted. The state of communicating with the port 22 can be switched to the state of communicating between the input port 20 and the output port 21.

The substrate 5 includes a first substrate 50 arranged so that the substrate surfaces 500A and 500B are arranged along the valve shaft 13 inserted from the shaft insertion port 610c, and a second substrate 51 arranged close to the terminal box 62. And a third substrate 52 arranged close to the solenoid unit 3.

Of the substrate surfaces 500A and 500B of the first substrate 50, the body 611, the solenoid unit 3, and the third substrate 52 are arranged on the first substrate surface 500A side. The second substrate 51 and the terminal box 62 are arranged on the second substrate surface 500B side opposite to the first substrate surface 500A side.

The sensor 4 mounted on the first substrate 50 includes, for example, a first pressure sensor 40 for measuring the fluid pressure of air A flowing through the input side flow path 26 and the first flow path 63, and an output side flow path. The second pressure sensor 41 that measures the fluid pressure of the air A flowing through the 27 and the second flow path 64 and the rotation angle when the valve shaft 13 is rotationally driven are measured, and the main valve 11 is measured according to the rotation angle. Includes a main valve opening sensor 42 that acquires valve opening information. As a result, the first pressure sensor 40, the second pressure sensor 41, and the main valve opening sensor 42 are integrated on one substrate (first substrate 50), so that the solenoid valve 1 and the fluid pressure drive valve 10 are integrated. It is possible to realize the monitoring function required for properly diagnosing whether or not the operation is normal with a simple configuration.

The main valve opening sensor 42 is composed of, for example, a magnetic sensor, measures the magnetic strength generated by the permanent magnet 131 attached to the second end 130B of the valve shaft 13, and measures the magnetic strength. Correspondingly, the valve opening information of the main valve 11 is acquired.

The main valve opening sensor 42 faces the outer periphery of the valve shaft 13 around the axis of the first board surface 500A of the first board 50 arranged along the valve shaft 13 inserted from the shaft insertion port 610c. It is placed in the position to be used. As a result, in the accommodating portion 6, the main valve opening sensor 42 mounted on the first substrate 50 and the second end portion 130B of the valve shaft 13 are brought close to each other without wasting the arrangement space. The valve opening information can be accurately acquired.

The main valve opening sensor 42 is mounted on the first substrate 50 closer to the shaft insertion port 610c than the first pressure sensor 40 and the second pressure sensor 41. As a result, the first flow path 63 communicating with the first pressure sensor 40 and the second flow path 64 communicating with the second pressure sensor 41 are the second of the main valve opening sensor 42 and the valve shaft 13. Since it is arranged at a position separated from the end portion 130B of 2, the shape and arrangement of the first flow path 63 and the second flow path 64 can be simplified.

The sensor 4 mounted on the third substrate 52 includes, for example, a magnetic sensor 46 that measures the magnetic strength generated by the solenoid unit 3. When the solenoid valve 1 is supplied with electric power from the external power source 16, the magnetic sensor 46 determines the magnetic strength generated by the solenoid unit 3 being energized and the coil current flowing through the solenoid coil 31. measure.

At that time, when the solenoid valve 1 is operating normally without any abnormality, the magnetic strength to be measured by the magnetic sensor 46 is, for example, the specification of the solenoid unit 3 (solenoid coil 31). With a value that can be calculated in advance according to the number of turns and dimensions of the coil current, the set current value of the coil current, the positional relationship between the solenoid unit 3 and the magnetic sensor 46, etc. (design magnetic strength (a value having a predetermined width may be used)). be. Therefore, the magnetic sensor 46 measures the magnetic strength (measured magnetic strength) generated by the solenoid unit 3 in the energized state at a predetermined sampling cycle, and compares the measured magnetic strength with the above-mentioned design magnetic strength. By doing so, it becomes possible to detect an abnormality or a sign of the abnormality of the solenoid valve.

Further, when the solenoid valve 1 is operating normally without any abnormality, the magnetic strength to be measured by the magnetic sensor 46 before and after switching between the energized state and the non-energized state of the solenoid unit 3. It is assumed that when the non-energized state is switched to the energized state, the magnetic strength increases from zero to the design magnetic strength, and when the non-energized state is switched to the non-energized state, the design magnetic strength decreases to zero. Therefore, the magnetic field sensor measures the magnetic strength (measured magnetic strength) generated by the solenoid unit 3 before and after switching between the energized state and the non-energized state of the solenoid unit 3, and the measured magnetic strength is in accordance with the above assumption. By confirming whether or not there is a change (rising or falling), it is possible to detect an abnormality in the solenoid valve.

It is also possible to obtain the current value of the coil current from the magnetic strength measured by the magnetic sensor 46. Therefore, when detecting an abnormality in the solenoid valve 1, the measured magnetic strength is not used as a judgment standard, but the current value of the coil current obtained from the measured magnetic strength is used as a judgment standard, for example, the set current value of the coil current. You may try to compare.

Here, the third substrate 52 is arranged close to the solenoid unit 3 as described above, and "proximity" means that the solenoid unit 3 (particularly the solenoid coil 31) is moved by the magnetic sensor 46. A state in which the third substrate 52 and the solenoid unit 3 are arranged within a range in which the generated magnetic strength can be measured. Therefore, the third substrate 52 and the solenoid case 30 may be arranged so as to be in contact with each other, or may be arranged at a predetermined interval, for example, via a spacer or the like. It may be attached to the solenoid case 30 or may be attached to the inner wall surface of the second accommodating portion 61.

Further, the third substrate 52 is arranged outside the solenoid case 30 and inside the accommodating portion 6. In the present embodiment, the solenoid portion 3 is accommodated in the space formed by the housing 610 and the solenoid cover 612 constituting the second accommodating portion 61, and is arranged outside the solenoid case 30. As a result, the third substrate 52 and the magnetic sensor 46 are protected without being exposed to the outside air, and the magnetism generated by the solenoid coil 31 can be reliably measured.

At that time, when the radial direction of the solenoid coil 31 is indicated by the arrow R1 in FIG. 2, the magnetic sensor 46 is arranged outside the radial direction of the solenoid coil 31. Further, the magnetic sensor 46 is preferably arranged inside both ends of the solenoid case 30 (arrow Y1 in FIG. 2) with respect to the axial direction of the solenoid coil 31, and is further inside both ends of the solenoid coil 31 (FIG. 2). It is more preferable to be arranged at the arrow Y2). The number of magnetic sensors 46 mounted on the third substrate 52 is not limited to one, and may be plural. Further, the magnetic sensor 46 is further mounted on a substrate different from the third substrate 52, and the other substrate is arranged at a position different from that of the third substrate 52 and is close to the solenoid unit 3. May be arranged.

FIG. 3 is a block diagram showing an example of the solenoid valve 1 according to the embodiment of the present invention. FIG. 4 is a schematic view showing an example of mounting a plurality of sensors 4 on the substrate 5 according to the embodiment of the present invention. Note that FIG. 4 does not strictly indicate the position where each sensor 4 is mounted on the substrate 5, and each sensor 4 is mounted on any of the first to third substrates 50 to 52. It shows the mounting state of the sensor.

As an example of electrical configuration, the solenoid valve 1 communicates with the control unit 7 that controls the solenoid valve 1 and the external device 15 in addition to the above-mentioned first to third substrates 50 to 52 and the plurality of sensors 4. It includes a communication unit (external transmission unit) 8 having a function and a power supply circuit unit 9 connected to the external power supply 16.

The plurality of sensors 4 refer to the solenoid unit 3 in addition to the above-mentioned first pressure sensor 40, second pressure sensor 41, main valve opening sensor 42, and magnetic sensor 46 as a group of sensors for measuring the physical quantity of each unit. A voltage sensor 43 for measuring the supply voltage, a current / resistance sensor 44 for measuring the current value when the solenoid unit 3 is energized and a resistance value when the solenoid unit is not energized, and a temperature sensor 45 for measuring the internal temperature of the accommodating unit 6. Be prepared.

In addition, the plurality of sensors 4 measure at least one of the total energization time for the solenoid unit and the current energization continuous time as the operating time of the solenoid unit 3 as a sensor group for acquiring information on the operation history of each unit. A total of 47 and an operation counter 48 for counting the number of operations of each of the solenoid valve 1, the drive device 12, and the main valve 11 are provided.

The control unit 7 processes information indicating the state of each part of the solenoid valve 1 acquired by the plurality of sensors 4, and also controls the state of energization of the microcontroller 70 that controls each part of the solenoid valve 1 and the solenoid unit 3. A valve test switch 71 that opens and closes the main valve 11 during a test operation is provided.

The microcontroller 70 includes a processor (not shown) such as a CPU (Central Processing Unit) and an internal storage unit 702 composed of a ROM (Read Only Memory), a RAM (Random Access Memory), and the like.

The internal storage unit 702 stores a set value when the solenoid valve 1 operates, temporary storage data when the solenoid valve 1 operates, an electromagnetic valve control program that controls the operation of the solenoid valve 1, and the like. ..

The processor of the microcontroller 70 has a monitoring processing unit 700 that executes a monitoring process for monitoring the state of each part of the solenoid valve 1 by a plurality of sensors 4 by executing a solenoid valve control program stored in the internal storage unit 702. It functions as an abnormality determination unit 701 that determines whether or not an abnormality has occurred in the solenoid unit 3 based on the magnetic strength measured by the magnetic sensor 46.

During steady operation, the monitoring processing unit 700 is at least one of the plurality of sensors 4 regardless of whether or not the main valve 11 is opened / closed (hereinafter, referred to as “first monitored sensor 4A”). Is used to execute the "first monitoring process" for monitoring the state of the solenoid valve 1. Further, the monitoring processing unit 700 uses at least one of the plurality of sensors 4 (hereinafter, referred to as “second monitoring target sensor 4B”) during the unsteady operation in which the main valve 11 is opened and closed. The "second monitoring process" for monitoring the state of the solenoid valve 1 is executed. The first monitored sensor 4A is, for example, all of the plurality of sensors 4 (first pressure sensor 40, second pressure sensor 41, main valve opening sensor 42, voltage sensor 43, current / resistance sensor 44). , The temperature sensor 45, the magnetic sensor 46, the operating time meter 47, and the operation counter 48), but the present invention is not limited to these examples. Further, the second monitored sensor 4B is, for example, the second pressure sensor 41 and the main valve opening degree sensor 42, but is not limited to these examples.

In the first monitoring process, the monitoring processing unit 700 acquires the state of the solenoid valve 1 acquired by the first monitored sensor 4A in the first sampling period (for example, every 10 seconds) as the first acquired data. Then, each time the first acquired data is acquired, it is sequentially transmitted to the external device 15 via the communication unit 8.

In the second monitoring process, the monitoring processing unit 700 performs a second monitoring target in a second sampling cycle (for example, 10 msec interval) shorter than the first sampling cycle in the operation period in which the solenoid valve 1 is operated. The state of the solenoid valve 1 acquired by the sensor 4B is acquired as the second acquisition data, respectively. Then, the monitoring processing unit 700 internally sets the acquired data group configured by associating the second acquired data acquired within the operation period with the acquired acquisition time of each of the second acquired data as temporary storage data. It is stored in the storage unit 702. Then, the acquired data group stored in the internal storage unit 702 is transmitted to the external device 15 at a predetermined timing.

The abnormality determination unit 701 executes a plurality of abnormality determination processes on the magnetic strength (measured magnetic strength) measured by the magnetic sensor 46 to determine whether or not an abnormality has occurred in the solenoid unit 3. judge.

For example, the abnormality determination unit 701 compares the measured magnetic strength when the solenoid unit 3 is energized and the design magnetic strength as the first abnormality determination process, and whether the difference between the two is larger than a predetermined threshold value. By determining whether or not it has occurred, it is determined whether or not an abnormality has occurred. Further, as the second abnormality determination process, the abnormality determination unit 701 changes (increases or decreases) the measured magnetic strength according to the energized state and the non-energized state before and after switching between the energized state and the non-energized state of the solenoid unit 3. ), It is determined whether or not an abnormality has occurred. The abnormality determination unit 701 may execute the above abnormality determination process using the data from the magnetic sensor 46, or may perform the above abnormality determination process using the temporary storage data stored in the internal storage unit 702. You may do it.

The valve test switch 71 receives a command from the microcontroller 70 when a predetermined test operation condition is satisfied, and as a test operation, a full stroke test (hereinafter, referred to as “FST”) or a partial stroke of the solenoid valve 1 is performed. A test (hereinafter referred to as "PST") is executed.

FST diagnoses an abnormality in the fluid pressure drive valve 10 by operating the main valve 11 from the fully open state to the fully closed state and returning it to the fully open state. The PST partially closes the main valve 11 from the fully open state to a predetermined opening state and returns it to the fully open state, so that the main valve 11 is not operated to the fully closed state (that is, without stopping the plant equipment). , The abnormality of the fluid pressure drive valve 10 is diagnosed.

FST and PST are executed in parallel with the second monitoring process by the monitoring processing unit 700. Therefore, the fluid pressure drive is performed by determining whether or not the operation is completed within a predetermined set time based on the state of the solenoid valve 1 acquired by each sensor 4 when the main valve 11 is operated. It is possible to diagnose the abnormality of the valve 10. Further, by analyzing the time-series change of the state of the solenoid valve 1 acquired by each sensor 4 when the main valve 11 is operated (for example, comparing with the time-series change at the normal time), the fluid pressure drive valve It is possible to diagnose 10 abnormalities.

As the test operation conditions, for example, the execution time or a specific designated date and time according to the execution frequency (for example, once a year) designated as the set value of the internal storage unit 702 has arrived, or the external device 15 (for example, once a year) has arrived. , Plant management computer), or when the test execution button (not shown) provided on the solenoid valve 1 is operated by the administrator, the test operation condition is satisfied. Should be executed.

The communication unit 8 is a communication modem 80 that transmits / receives data to / from the external device 15 in accordance with the HART (Highway Addressable Remote Transducer) communication standard, and a loop current controller that inputs / outputs a control current (analog signal of 4 to 20 mA). It includes 81. When the communication modem 80 converts the data to be transmitted into a frequency signal, the loop current controller 81 transmits a superimposed signal obtained by superimposing the frequency signal on the control current to the external device 15. When the loop current controller 81 receives the superposed signal from the external device 15 and separates the frequency signal from the superposed signal, the communication modem 80 converts the frequency signal into data to be received.

The power supply circuit unit 9 is supplied from the external power supply 16 via the power cable 160 and the reverse voltage protection circuit 90 that protects the control unit 7 from the reverse voltage generated when the power cable 160 is reversely connected to the terminal box 62. It is provided with an internal power supply circuit 91 that converts the generated power into predetermined voltages and currents and supplies them to each part of the electromagnetic valve 1 (solar part 3, sensor 4, substrate 5, control part 7, communication part 8, etc.).

As shown in FIG. 4, the first substrate 50 includes a first pressure sensor 40, a second pressure sensor 41, a main valve opening sensor 42, a voltage sensor 43, a current / resistance sensor 44, a temperature sensor 45, and an operation. A time meter 47, an operation counter 48, a control unit 7, a communication modem 80, and a reverse voltage protection circuit 90 are mounted. The loop current controller 81 and the internal power supply circuit 91 are mounted on the second substrate 51. The magnetic sensor 46 is mounted on the third substrate 52.

The plurality of sensors 4 are not limited to the above sensors 40 to 48, and may further include sensors for acquiring information on other physical quantities and operation histories, and some of these sensors 40 to 48 may be provided. It may be omitted. Further, the mounting state of the sensors 40 to 48 when the plurality of sensors 4 are mounted on the substrates 50 to 52 is not limited to the example shown in FIG. 4, and may be appropriately changed. Further, the number of substrates 5 accommodated in the accommodating portion 6 and the arrangement of the substrates 50 to 52 with respect to the accommodating portion 6 may be appropriately changed.

Further, the sensors 40 to 48 are not limited to those in which each sensor is individually provided as shown in FIGS. 3 and 4, and the specific sensor also functions as another sensor. Sensors may not be provided individually. For example, the magnetic sensor 46 measures the magnetic strength generated by the solenoid unit 3, and the current / resistance sensor 44 obtains the current value when the solenoid unit 3 is energized based on the magnetic strength. It does not have to be provided individually. Further, the microcontroller 70 may have a built-in sensor function or a part of the sensor function. For example, the microcontroller 70 has a built-in operating time meter 47 and an operation counter 48. , The operation time meter 47 and the operation counter 48 may not be provided separately.

(Other embodiments)
Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be appropriately modified without departing from the technical idea of the present invention.

For example, in the above embodiment, the drive device 12 has been described as rotating the valve shaft 13, but the valve shaft 13 may be driven in a reciprocating linear manner. In this case, as the main valve 11 whose opening / closing operation is performed in response to the reciprocating linear drive of the valve shaft 13, for example, a type such as a gate valve or a globe valve may be used.

Further, as the configuration of the electromagnetic valve 1 in this case, the accommodating portion 6 has a shaft insertion port into which the end portion of the valve shaft driven linearly by the drive device 12 is inserted, and the valve shaft is driven linearly reciprocatingly. It accommodates a driving force transmission mechanism (for example, a rack and pinion mechanism, a link mechanism, a cam mechanism, etc.) that rotationally drives the rotating shaft in conjunction with the movement. The substrate surface of the first substrate 50 is arranged along the rotation axis, and the main valve opening sensor 42 is located on the outer periphery of the substrate surface of the first substrate 50 around the axis of the rotation axis. It may be placed at opposite positions and the rotation angle of the rotation shaft may be measured in order to obtain the valve opening degree of the main valve 11.

Further, the above-mentioned driving force transmission mechanism may be arranged outside the accommodating portion 6, and in this case, the end portion of the rotary shaft rotationally driven by the driving force transmission mechanism is inserted from the shaft insertion port. At the same time, the substrate surface of the first substrate 50 is arranged along the rotation axis inserted from the shaft insertion port, and the main valve opening sensor 42 determines the valve opening of the main valve 11 so that the valve shaft Instead of the rotation angle of 13, the rotation angle of the rotation axis may be measured.

As described above, according to the solenoid valve 1 and the fluid pressure drive valve 10 according to the above embodiment, the third substrate 52 is arranged close to the solenoid portion 3, and the magnetic sensor 46 is the third. It is placed on the substrate 52 of the above, and the strength of the magnetism generated by the solenoid unit 3 is measured.

Therefore, the magnetic sensor 46 measures the strength of the magnetism generated by the solenoid unit 3 regardless of the presence or absence of the operation of the solenoid unit 3, thereby performing post-maintenance and predictive maintenance of the solenoid valve 1 and the fluid pressure drive valve 10. Can be realized.

1 ... Solenoid valve, 2 ... Spool part, 3 ... Solenoid part, 4 ... Sensor, 4A ... First monitored sensor, 4B ... Second monitored sensor, 5 ... Board, 6 ... Accommodating part, 7 ... Control unit , 8 ... communication unit, 9 ... power supply circuit unit, 10 ... fluid pressure drive valve, 11 ... main valve, 12 ... drive device, 13 ... valve shaft, 14 ... air supply source, 15 ... external device, 16 ... external power supply,
20 ... Input port, 21 ... Output port, 22 ... Exhaust port, 23 ... Spool hole, 24 ... Spool valve, 25 ... Spool spring, 26 ... Input side flow path, 27 ... Output side flow path, 28 ... Exhaust flow path, 30 ... Solenoid case, 31 ... Solenoid coil, 32 ... Movable iron core, 33 ... Fixed iron core, 34 ... Solenoid spring, 40 ... First pressure sensor, 41 ... Second pressure sensor, 42 ... Main valve opening sensor , 43 ... Voltage sensor, 44 ... Current / resistance sensor, 45 ... Temperature sensor, 46 ... Magnetic sensor, 47 ... Operating time meter, 48 ... Operation counter, 50 ... First board, 51 ... Second board, 52 ... Third substrate (board), 60 ... first accommodating portion, 61 ... second accommodating portion, 62 ... terminal box, 63 ... first flow path, 64 ... second flow path, 65 ... spool flow path , 70 ... Micro controller, 71 ... Valve test switch, 80 ... Communication solenoid, 81 ... Loop current controller, 90 ... Reverse voltage protection circuit, 91 ... Internal power supply circuit, 100 ... Piping, 110 ... Valve box, 111 ... Valve body , 120 ... Cylinder, 121 ... Solenoid rod, 122A ... First piston, 122B ... Second piston, 123 ... Coil spring, 124 ... Air supply / exhaust port, 125 ... Transmission mechanism, 130A ... First end, 130B ... second end, 140 ... first air pipe, 141 ... second air pipe, 150 ... communication cable, 160 ... power cable, 500A ... first board surface, 500B ... second board surface, 610 ... Housing, 610a ... First housing end, 610b ... Second housing end, 610c ... Shaft insertion port, 610d ... Body insertion port, 610e ... Cable insertion port, 611 ... Body, 612 ... Solenoid cover, 613 ... Terminal box cover, 700 ... Monitoring processing unit, 701 ... Abnormality judgment unit, 702 ... Internal storage unit, A ... Air

Claims

It ’s a solenoid valve,
A spool part that switches the flow path through which the drive fluid flows, and
A solenoid part that displaces the spool part according to the energized state, and
A substrate arranged close to the solenoid portion and
A magnetic sensor mounted on the substrate and measuring the magnetic strength generated by the solenoid portion is provided.
The solenoid part is
A solenoid coil that generates magnetism according to the energized state, and
A solenoid case for accommodating the solenoid coil is provided.
The substrate is
Located on the outside of the solenoid case
The magnetic sensor is
It is arranged outside the solenoid coil in the radial direction and inside both ends of the solenoid coil with respect to the axial direction of the solenoid coil.
A solenoid valve characterized by that.
The spool portion, the solenoid portion, the substrate, and the accommodating portion for accommodating the magnetic sensor are further provided.
The substrate is
Outside the solenoid case and inside the housing.
The solenoid valve according to claim 1.
An abnormality determination unit for determining whether or not an abnormality has occurred in the solenoid unit is further provided based on the magnetic strength measured by the magnetic sensor.
The solenoid valve according to claim 1 or 2, wherein the solenoid valve is characterized in that.
The solenoid valve according to any one of claims 1 to 3,
Main valve and
A drive device for opening and closing the main valve by driving the valve shaft connected to the main valve according to the fluid pressure of the driving fluid is provided.
The solenoid valve is
It has a function of controlling the supply and discharge of the driving fluid to the driving device.
A fluid pressure driven valve characterized by that.