JP2021139488A - solenoid valve - Google Patents

Abstract

To provide a solenoid valve capable of acquiring data useful for predictive maintenance while including not only an operation period in which the solenoid valve is operated but also the other period than the operation period.SOLUTION: A solenoid valve comprises a plurality of sensors for acquiring states of respective parts of the solenoid valve, a communication unit (external transmission unit) 8, an internal storage unit 701 and a monitor processing unit 700. The monitor processing unit 700 executes first monitor processing in which a state of the solenoid valve is acquired as first acquisition data DA in a first sampling period PA and transmits the first acquisition data DA to an external device 15 via the communication unit 8 successively each time the first acquisition data are acquired, and second monitor processing in which a state of a solenoid valve 1 is acquired as second acquisition data DB respectively in a second sampling period PB (<PA) during an operation period Q in which the solenoid valve is operated, and an acquisition data group SB including the second acquisition data DB respectively acquired within the operation period Q is stored in the internal storage unit 701.SELECTED DRAWING: Figure 5

Description

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

Conventionally, a fluid pressure drive valve that opens and closes a main valve by controlling a drive fluid with a solenoid valve is known.
For example, Patent Document 1 describes a fluid pressure drive valve used for piping of plant equipment, which is a ball valve (main valve) in which the drive fluid is controlled by a solenoid valve in an emergency such as when an abnormality occurs in the equipment.
An emergency shutoff valve device that shuts off the fluid flowing through the pipe by closing the pipe is disclosed.

JP-A-2009-97539

The emergency shutoff valve device disclosed in Patent Document 1 is installed in a control room of a plant facility and detects a logic controller for energizing a solenoid valve and a valve shaft rotation operation, that is, a ball valve opening / closing operation. Then, it is provided with a limit switch that feeds back to the logic controller and performs an operation confirmation test of the ball valve.

However, Patent Document 1 only discloses that the state of the emergency shutoff valve device is monitored by using a limit switch in the operation confirmation test involving the opening / closing operation, and in the operation confirmation test, the state of each part of the solenoid valve is checked. It is not something to monitor. Further, Patent Document 1 does not disclose a method of diagnosing an abnormality of a solenoid valve and an emergency shutoff valve device other than performing an operation confirmation test accompanied by an opening / closing operation.

Therefore, it can be said that the operation confirmation test disclosed in Patent Document 1 realizes post-maintenance to grasp the occurrence of an abnormality after the fact, but in order to improve the operating rate and reliability of the plant equipment, the abnormality is found. It is desirable to realize predictive maintenance that grasps signs in advance. On top of that, the signs of abnormality are expressed as various events, so in order to accurately extract those events, not only the operation period during which the solenoid valve is operated (during unsteady operation), but also Period other than the operation period (
It is necessary to realize a mechanism to monitor the state of each part of the solenoid valve, including during steady operation).

The present invention has been made in view of such circumstances, and includes not only the operation period in which the solenoid valve is operated but also the period other than the operation period, as well as data useful for post-maintenance. The purpose is to provide a solenoid valve capable of acquiring useful data for predictive maintenance.

The present invention solves the above problems, and the solenoid valve according to the embodiment of the present invention is
Multiple sensors that acquire the state of each part of the solenoid valve,
An external transmitter that sends data to an external device,
An internal storage unit that stores data and
The state of the solenoid valve acquired by at least one of the plurality of sensors in the first sampling cycle is acquired as the first acquired data, and the first acquired data is transmitted to the outside each time it is acquired. The first monitoring process, which is sequentially transmitted to the external device via the unit,
In the operation period in which the solenoid valve is operated, the state of the solenoid valve acquired by at least one of the plurality of sensors in a second sampling cycle shorter than the first sampling cycle is obtained. The inside is a group of acquired data that is acquired as the acquired data of 2 and is configured by associating the second acquired data acquired within the operation period with the acquisition time of each of the second acquired data. It is provided with a monitoring processing unit that executes a second monitoring processing stored in the storage unit.

According to the solenoid valve according to the embodiment of the present invention, the monitoring processing unit is the first in the first monitoring processing.
The state of the solenoid valve is acquired as the first acquired data in the sampling cycle of, and each time the acquired data is acquired, the state of the solenoid valve is sequentially transmitted to the external device via the external transmitter, and the second acquired data is transmitted.
In the monitoring process of, in the operation period in which the solenoid valve is operated, the state of the solenoid valve is acquired as the second acquisition data in the second sampling cycle shorter than the first sampling cycle, and each of them is acquired within the operation period. An acquired data group configured by associating the acquired second acquired data with the acquired acquisition time of each of the acquired second acquired data is stored in the internal storage unit.

Therefore, for the first acquired data acquired in the first monitoring process that is continuously executed in a relatively long cycle (first sampling cycle), each time it is acquired, an external device is used via an external transmitter. Since the data is sequentially transmitted to the internal storage unit, the internal storage unit is not overloaded, and the communication interval (= first sampling cycle) of the external transmission unit is secured, so that the external transmission unit may be overloaded. No. Then, since the first acquired data transmitted to the external device is continuously acquired by the first sampling cycle regardless of the operation of the solenoid valve, not only the post-maintenance but also the predictive maintenance is performed. It can be used as data for.

Further, during the operation period in which the solenoid valve is operated, the second acquired data acquired in the second monitoring process temporarily executed in a relatively short cycle (second sampling cycle) is operated. Since the acquired data group configured by associating the second acquired data acquired within the period with the acquired acquisition time of each of the second acquired data is stored in the internal storage unit, a load is applied to the external transmission unit. It is not applied, and since it is limited to the operation period, an excessive load is not applied to the internal storage unit. Since the acquired data group stored in the internal storage unit is the state in which the state of each part of the solenoid valve is acquired in detail by the second sampling cycle according to the operation period in which the solenoid valve is operated. It can be used as data for predictive maintenance. Further, the acquired data group stored in the internal storage unit can also be used as data for performing post-mortem maintenance.

Therefore, while suppressing an excessive load on the external transmission unit and the internal storage unit, not only the data useful for post-maintenance but also the data useful for the post-maintenance including not only the operation period in which the solenoid valve is operated but also the period other than the operation period are included. Data useful for predictive maintenance can be obtained.

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. It is a timing chart which shows an example of the function of the monitoring processing unit 700 which concerns on embodiment of this invention. It is a data composition diagram which shows an example of the 1st acquisition data DA and the 1st acquisition data group SA. It is a data structure diagram which shows an example of the 2nd acquisition data DB and the 2nd acquisition data group SB.

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.

In the fluid pressure drive valve 10, as an example of the drive fluid, air (air) A from the air supply source 14
Is supplied, and the air A from the air supply source 14 is supplied to the solenoid valve 1 via the first air pipe 140, and further to the drive device 12 via the second air pipe 141. Will be done. 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 be an airless open system.
In that case, the main valve 11 may be fully closed by supplying the air A to the drive device 12 to fully open the operation and discharging the air A from the drive device 12.

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 is provided with a cylindrical cylinder 120 and a piston rod 121 that can reciprocate and linearly move in the cylinder.
A pair of pistons 122A and 122B connected via the above, a coil spring 123 provided on the first piston 122A side, and an air supply / discharge port 12 formed on the second piston 122B side.
4 and a transmission mechanism 125 provided at a portion where the valve shaft 13 arranged so as to penetrate the cylinder 120 along the radial direction and the piston rod 121 are orthogonal to each other are provided. The drive device 1
2 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 is
A plurality of shafts may be 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 not energized). It is provided with a solenoid unit 3 that displaces the spool unit 2 accordingly. note that,
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 good. Further, in the present embodiment, the solenoid valve 1 is
Although it is used as a pilot valve in the fluid pressure drive valve 10, the application of the solenoid valve 1 is not limited to this.

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

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 14.
The second piston 122B is pressed and the coil spring 123 is compressed by flowing in the order of 1 and being supplied to the air supply / discharge port 124. Then, the valve shaft 1 is passed through the piston rod 121 and the transmission mechanism 125 by the amount that the piston rod 121 moves according to the compression of the coil spring 123.
When 3 is rotationally driven, the valve body 111 rotates in the valve box 110, and the main valve 11 is operated in a fully open state.

On the other hand, when the solenoid valve 1 is in a non-energized state, the air A (exhaust) in the cylinder 120 becomes
The pressing pressure of the second piston 122B is reduced and the coil spring 123 is compressed by flowing 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 and being discharged to the outside air. Restore from 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. , The spool portion 2, the solenoid portion 3, the accommodating portion 6 accommodating the plurality of sensors 4 and the substrate 5.
And.

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. 61
And a terminal box 62 to which the communication cable 150 and the power cable 160 are connected. 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 made to penetrate the body 611.
A first flow path 63 that branches from the input side flow path 26 and communicates between the input side flow path 26 and the first pressure sensor 40, and an output side flow path 27 that branches from the output side flow path 27. A second flow path 64 communicating with the second pressure sensor 41 and a spool flow path 65 through which air A for interlocking the spool portion 2 and the solenoid portion 3 are formed are 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. First substrate surface 500A
The second substrate 51 and the terminal box 62 are on the second substrate surface 500B side opposite to the side.
Is placed.

The sensor 4 mounted on the first substrate 50 is, for example, an input side flow path 26 and a first flow path 63.
A first pressure sensor 40 that measures the fluid pressure of the air A flowing through the It includes a main valve opening degree sensor 42 that measures the rotation angle when the 13 is driven to rotate and acquires valve opening degree information of the main valve 11 according to the rotation angle. 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 5 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, the arrangement space is not wasted in the accommodating portion 6.
The main valve opening sensor 42 mounted on the first substrate 50 and the second end 130B of the valve shaft 13 can be arranged close to each other, and the valve opening information can be accurately acquired. Can be done.

The main valve opening degree 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 40 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.

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 placed on the substrate 5, and each sensor 4 does not show exactly.
Indicates the mounting state of which of the first to third substrates 50 to 52 is mounted.

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 measure the supply voltage to the solenoid unit 3 in addition to the above-mentioned first pressure sensor 40, second pressure sensor 41, and main valve opening sensor 42 as a sensor group for measuring the physical quantity of each part. The voltage sensor 43, the current / resistance sensor 44 that measures the current value when the solenoid unit 3 is energized and the resistance value when the solenoid unit is not energized, the temperature sensor 45 that measures the internal temperature of the accommodating unit 6, and the solenoid unit 3 It includes a magnetic sensor 46 that measures the strength of the generated magnetism.

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, a solenoid valve 1, a drive device 12, and a main valve 1
1 The operation counter 48 for counting the number of times of each operation is provided.

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

The microcontroller 70 is a processor such as a CPU (Central Processing Unit) (
It includes an internal storage unit 701 composed of a ROM (Read Only Memory), a RAM (Random Access Memory), and the like (not shown).

The internal storage unit 701 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 is 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 701. Function. The details of the monitoring processing unit 700 and the monitoring processing will be described later.

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. Test (hereinafter referred to as "PST".
) Is executed.

The 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.

The FST and PST are executed in parallel with the monitoring process (described later as "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. again,
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 10 It is possible to diagnose abnormalities.

As 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 701 may arrive, or the external device 15 (for example, once a year) may be used. , 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 includes 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 control current (4 to 20 mA).
A loop current controller 81 for inputting / outputting an analog signal) is provided. 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. Converts the generated power into predetermined voltage and current, and converts each part of the electromagnetic valve 1 (
It includes an internal power supply circuit 91 that supplies the solenoid unit 3, the sensor 4, the substrate 5, the control unit 7, the communication unit 8, and the like).

As shown in FIG. 4, the first substrate 50 includes a first pressure sensor 40 and a second pressure sensor 41.
, Main valve opening sensor 42, voltage sensor 43, current / resistance sensor 44, temperature sensor 45, operating time meter 47, operation counter 48, control unit 7, communication modem 80 and 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 these sensors 40.
A part of ~ 48 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 each substrate 50 to 5 with respect to the accommodating portion 6
The arrangement of 2 may be changed as appropriate.

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 solenoid unit 3 is based on the magnetic strength.
The current / resistance sensor 44 may not be provided individually by obtaining the current value at the time of energization. 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.

(About the solenoid valve monitoring function)
Next, the monitoring processing unit 700 and the details of the monitoring processing will be described.

FIG. 5 is a timing chart showing an example of the function of the monitoring processing unit 700 according to the embodiment of the present invention. FIG. 6 is a data configuration diagram showing an example of the first acquired data DA and the first acquired data group SA. FIG. 7 is a data configuration diagram showing an example of the second acquired data DB and the second acquired data group SB.

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 is referred to as at least one sensor among the plurality of sensors 4 (hereinafter, referred to as “second monitored sensor 4B”” during unsteady operation in which the main valve 11 is opened and closed by FST or PST. ) Is used to execute the "second monitoring process" for monitoring the state of the solenoid valve 1.

In the first monitoring process, as shown in FIG. 5, the monitoring processing unit 700 states the solenoid valve 1 acquired by the first monitored sensor 4A in the first sampling period PA (for example, every 10 seconds). Is acquired as the first acquired data DA (i), and each time the first acquired data DA (i) is acquired, it is sequentially transmitted to the external device 15 via the communication unit 8. In the external device 15,
By sequentially receiving the first acquired data DA (i), the first acquired data DA (i) and the acquired time TA (i) obtained from the first acquired data DA (i) are linked. The constituent first acquired data group SA is accumulated.

Therefore, the monitoring processing unit 700 executes the first monitoring processing, and the first sampling period PA
When the first acquired data DA (i) (i = 1, 2, ..., M) m times are acquired in the external device 15, the first acquired data group SA shown in FIG. 6 is accumulated in the external device 15. NS.

In the second monitoring process, as shown in FIG. 5, the monitoring process unit 700 has a second sampling cycle PB (for example, which is shorter than the first sampling cycle PA) in the operation period Q in which the solenoid valve 1 is operated. The state of the solenoid valve 1 acquired by the second monitored sensor 4B at intervals of 10 msec) is acquired as the second acquired data DB (j). Then, the monitoring processing unit 700 links the second acquired data DB (j) acquired within the operation period Q and the acquisition time TB (j) obtained from each of the second acquired data DB (j). Second to attach and configure
The acquired data group SB is stored in the internal storage unit 701 as temporary storage data.

Therefore, the monitoring processing unit 700 executes the second monitoring processing, and the second acquired data DB (j) (j = 1, 2, ..., N) n times in the second sampling cycle PB in the operation period Q. ) Is acquired, the second acquired data group SB shown in FIG. 7 is accumulated in the internal storage unit 701.

As described above, according to the solenoid valve 1 according to the above embodiment, in the first monitoring process, the monitoring processing unit 700 sets the state of the solenoid valve 1 as the first acquired data DA in the first sampling cycle PA. The first acquired data DA is acquired, and each time it is acquired, it is sequentially transmitted to the external device 15 via the communication unit (external transmission unit) 8, and in the second monitoring process, the solenoid valve 1 is operated. In the operation period Q, the state of the solenoid valve 1 was acquired as the second acquisition data DB in the second sampling period PB (<PA) shorter than the first sampling period, and each was acquired within the operation period Q. A second acquisition data group (acquisition data group) SB that is configured by associating the second acquisition data DB and the acquisition time TB that acquired each of the second acquisition data DBs.
Is stored in the internal storage unit 701.

Therefore, the first is continuously executed in a relatively long cycle (first sampling cycle PA).
The first acquired data DA acquired by the monitoring process of the above is sequentially transmitted to the external device 15 via the communication unit 8 each time it is acquired, so that the internal storage unit 701 is not overloaded and the internal storage unit 701 is not overloaded. Since the communication interval (= first sampling cycle PA) of the communication unit 8 is secured, an excessive load is not applied to the communication unit 8. Then, since the first acquired data DA transmitted to the external device 15 is continuously acquired by the first sampling cycle PA regardless of the opening / closing operation of the main valve 11, for example, a threshold value is set. It can be used as data for post-maintenance to detect failures in each part, and for example, predictive maintenance to grasp the tendency of failures in each part by analyzing the time series of acquired data. It can be used as data for.

Further, in the operation period Q in which the solenoid valve 1 is operated, the second acquired data DA acquired in the second monitoring process temporarily executed in a relatively short cycle (second sampling cycle PB). The acquisition data group SB is configured by associating the second acquisition data DB acquired within the operation period Q and the acquisition time TB acquired from each of the second acquisition data DBs.
Is stored in the internal storage unit 701, so that no load is applied to the communication unit 8, and since the operation period Q is limited, an excessive load is not applied to the internal storage unit 701. Then, in the second acquired data group SB stored in the internal storage unit 701, the state of each part of the solenoid valve 1 is detailed by the second sampling cycle PB according to the operation period Q in which the operation of the solenoid valve 1 is performed. Since it was acquired in, it can be used as data for predictive maintenance. Further, the second acquired data group SB stored in the internal storage unit 701 can also be used as data for performing post-mortem maintenance.

Therefore, while suppressing an excessive load on the communication unit 8 and the internal storage unit 701, data useful for predictive maintenance includes not only the operation period Q in which the solenoid valve 1 is operated but also the period other than the operation period Q. Can be obtained.

In the second monitoring process, as shown in FIG. 5, the monitoring processing unit 700 stores the second acquired data group SB in the internal storage unit 701, and then the first acquired data in the first monitoring process. D
The second acquisition data group SB may be transmitted to the external device 15 via the communication unit 8 at a second transmission timing CB different from the first transmission timing CA for sequentially transmitting A. As a result, both the first acquired data DA and the second acquired data group SB can be reliably transmitted to the external device 15.

Further, as the first monitored sensor 4A in the first monitoring process, all of the plurality of sensors 4 may be used, or some of the sensors may be used. Further, for the second monitored sensor 4B in the second monitoring process, all of the plurality of sensors 4 may be used, or some of the sensors 4 may be used in the same manner. Further, when the sensor type or the number of sensors is compared between the first monitored sensor 4A and the second monitored sensor 4B, both may be the same or different.

Of the above, when the number of both sensors is different, in particular, the second monitored sensor (second)
As an example in the case where the number of sensors of the first monitored sensor (first sensor group) 4A is smaller than the number of sensors of the first monitored sensor (first sensor group) 4A, the monitoring processing unit 700 is used as the first monitored sensor 4A. , As shown in FIG. 6, 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, a magnetic sensor 46, and an operating time meter. The first monitoring process is executed using the nine sensors 4 of the 47 and the operation counter 48, and as the second monitored sensor 4B, as shown in FIG. 7, the second pressure sensor 41 and the main valve open. The second monitoring process may be executed using the degree sensor 42. As a result, in the first monitoring process, various events can be captured by monitoring the entire solenoid valve 1, and post-maintenance and predictive maintenance can be performed. In the second monitoring process, the internal storage unit 701 is supplied. While suppressing the load (the storage capacity of the second acquired data group SB), it is possible to perform predictive maintenance and post-maintenance by analyzing in detail the state when the solenoid valve 1 and the fluid pressure drive valve 10 are operated. can.

Further, the conditions when the monitoring processing unit 700 executes the first monitoring processing and the second monitoring processing (for example, the above-mentioned first monitoring target sensor 4A and second monitoring target sensor 4B, and the first The sampling cycle PA and the second sampling cycle PB) may be designated as, for example, a set value of the internal storage unit 701. In that case, even if the set value can be changed via an external device 15 (for example, a computer for plant management or a computer for diagnosis), an operation panel (not shown) provided on the solenoid valve 1, or the like. good. Further, the set value may be a fixed value or a variable value that fluctuates under a predetermined condition.

(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 driving the valve shaft 13 in a rotary manner, 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.

1 ... Solenoid valve, 2 ... Spool part, 3 ... Solenoid part,
4 ... Sensor, 4A ... First monitored sensor, 4B ... Second monitored sensor,
5 ... board, 6 ... accommodating unit, 7 ... control unit, 8 ... communication unit (external transmission 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 ... 1st pressure sensor, 41 ... 2nd 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 ... 1st substrate, 51 ... 2nd substrate, 52 ... 3rd substrate,
60 ... 1st containment, 61 ... 2nd containment, 62 ... Terminal box,
63 ... 1st flow path, 64 ... 2nd flow path, 65 ... Spool flow path,
70 ... Microcontroller, 71 ... Valve test switch,
80 ... communication modem, 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 ... Piston rod,
122A ... 1st piston, 122B ... 2nd piston,
123 ... Coil spring, 124 ... Air supply / exhaust port, 125 ... Transmission mechanism,
130A ... 1st end, 130B ... 2nd end,
140 ... 1st air pipe, 141 ... 2nd air pipe,
150 ... communication cable, 160 ... power cable,
500A ... 1st substrate surface, 500B ... 2nd substrate surface,
610 ... Housing, 610a ... First housing end,
610b ... Second housing end, 610c ... Shaft insertion slot, 610d ... Body insertion slot,
610e ... Cable insertion slot, 611 ... Body,
612 ... Solenoid cover, 613 ... Terminal box cover,
700 ... Monitoring processing unit, 701 ... Internal storage unit,
A ... air, Q ... operation period PA ... first sampling cycle, DA ... first acquisition data, TA ... acquisition time,
CA ... 1st transmission timing, SA ... 1st acquisition data group,
PB ... second sampling cycle, DB ... second acquisition data, TB ... acquisition time,
CB ... 2nd transmission timing, SB ... 2nd acquisition data group (acquisition data group)

Claims (6)

It ’s a solenoid valve,
Multiple sensors that acquire the state of each part of the solenoid valve,
An external transmitter that sends data to an external device,
An internal storage unit that stores data and
The state of the electromagnetic valve acquired by at least one of the plurality of sensors in the first sampling cycle is acquired as the first acquired data, and the first acquired data is transmitted to the outside each time it is acquired. In the operation period in which the first monitoring process of sequentially transmitting data to the external device via the unit and the operation of the electromagnetic valve are performed, the plurality of sensors have a second sampling cycle shorter than the first sampling cycle. The state of the electromagnetic valve acquired by at least one of the sensors is acquired as the second acquisition data, and each of the second acquisition data and the second acquisition data acquired within the operation period is obtained. It is provided with a monitoring processing unit that executes a second monitoring processing that stores the acquired data group configured by associating with the acquired acquisition time in the internal storage unit.
A solenoid valve characterized by that. The monitoring processing unit
During steady operation, the first monitoring process is executed regardless of the presence or absence of the operation.
As the operation period, the second monitoring process is executed during the unsteady operation in which the operation is performed.
The solenoid valve according to claim 1. The monitoring processing unit
In the first monitoring process, the state acquired by the first sensor group among the plurality of sensors is acquired as the first acquired data, and the state is acquired.
In the second monitoring process, the state acquired by the second sensor group, which is smaller than the number of sensors in the first sensor group among the plurality of sensors, is acquired as the second acquisition data.
The solenoid valve according to claim 1 or 2, wherein the solenoid valve is characterized in that. The monitoring processing unit
After storing the acquired data group in the internal storage unit in the second monitoring process, a second transmission different from the first transmission timing in which the first acquired data is sequentially transmitted in the first monitoring process. At the timing, the acquired data group is transmitted to the external device via the external transmission unit.
The solenoid valve according to any one of claims 1 to 3, wherein the solenoid valve is characterized in that. The solenoid valve is
It has a function of controlling the supply and discharge of the driving fluid to the driving device that opens and closes the main valve by driving the valve shaft connected to the main valve according to the fluid pressure of the driving fluid.
The plurality of sensors
A first pressure sensor for measuring the fluid pressure of the driving fluid flowing through the input side flow path of the solenoid valve connected to the driving fluid supply source, and a first pressure sensor.
A second pressure sensor for measuring the fluid pressure of the driving fluid flowing through the output side flow path of the solenoid valve connected to the driving device, and a second pressure sensor.
A main valve opening sensor that acquires valve opening information of the main valve, and
A voltage sensor that measures the supply voltage to the solenoid section of the solenoid valve, and
A current / resistance sensor that measures the current value when the solenoid is energized and the resistance value when the solenoid is not energized.
A temperature sensor that measures the internal temperature of the accommodation unit that houses the plurality of sensors, the external transmission unit, the internal storage unit, and the control unit that functions as the monitoring processing unit.
A magnetic sensor that measures the strength of the magnetism generated by the solenoid unit,
An operating time meter that measures the operating time of the solenoid unit,
An operation counter that counts the number of operations of each of the solenoid valve, the drive device, and the main valve,
Including at least
The solenoid valve according to any one of claims 1 to 4, wherein the solenoid valve is characterized in that. The monitoring processing unit
During steady operation, the first pressure sensor, the second pressure sensor, the main valve opening sensor, the voltage sensor, the current / resistance sensor, the temperature sensor, regardless of the presence / absence of the opening / closing operation. Using the magnetic sensor, the operating time meter, and the operating counter, the first monitoring process is executed.
During the unsteady operation in which the opening / closing operation is performed by the full stroke test or the partial stroke test as the operation period, the second monitoring process is executed by using the second pressure sensor and the main valve opening sensor. ,
The solenoid valve according to claim 5, wherein the solenoid valve is characterized in that.

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