JP2017101761A - Electromagnetic valve control apparatus and electromagnetic valve system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly detect a state of an electromagnetic valve under various kinds of environment while reducing manufacturing costs.SOLUTION: An electromagnetic valve control apparatus is provided with: a processing part (a driving circuit 31, a comparator 34 and a processing part 35) which executes opening/closing control processing for opening/closing an electromagnetic valve 1 by supplying driving current to an exciting coil 22 to slide a movable core 25; and an output part (an LC oscillation circuit 32 and an fV conversion circuit 33) which outputs a signal Sv to vary according to an inductance value of the exciting coil 22, in which the processing part executes position determination processing for determining which of an open valve position where a pilot valve 14 is separated from a peristome of a small hole 12h, and a closed valve position where the pilot valve 14 contacts the peristome of the small hole 12h a movable core 25 which is inserted into the exciting coil 22 is located based on a value of the signal sV to be output in a state of supplying no driving current to the exciting coil 22 and a reference value for determination, and executes predetermined processing according to its result.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electromagnetic valve control device that controls opening and closing of an electromagnetic valve, and an electromagnetic valve system that includes an electromagnetic valve control device and an electromagnetic valve.

  For example, in water supply facilities used for toilets and the like, water supply devices that control the supply of tap water by opening and closing electromagnetic valves are widely employed. In addition, in these water supply devices, tap water is continuously supplied even though the solenoid valve is shifted to a closed state by detecting the flow rate of tap water that has passed through the solenoid valve by a flow sensor. There is one that employs a configuration for detecting a situation or the like. However, in such a water supply apparatus, since it is necessary to connect a flow sensor to piping separately from the solenoid valve, there is a problem that not only miniaturization of the water supply apparatus becomes difficult, but also the manufacturing cost increases. .

  On the other hand, the following patent document describes whether the electromagnetic valve has shifted from the open state to the closed state by detecting the vibration generated when the movable core (movable iron core: plunger) slides in the actuator of the electromagnetic valve. An invention of a device capable of detecting whether the state has shifted to the valve open state (hereinafter, the device disclosed in this patent document is also referred to as “detection device”) is disclosed.

  Specifically, in this detection device, first, a current having a current value for maintaining the valve open state is supplied to the excitation coil of the electromagnetic valve that is in the valve open state in the initial state. At this time, when the vibration acceleration calculated based on the sensor signal from the vibration sensor does not exceed a predetermined value, that is, when vibration due to sliding of the movable core does not occur, the movable core does not slide. It is specified that the valve is open and in a normal state. Further, when the calculated vibration acceleration exceeds a predetermined value, that is, when vibration associated with sliding of the movable core occurs, the valve opening state is not maintained and the abnormal state is shifted to the valve closing state. Is specified.

  On the other hand, when the normal state is specified in the above processing, a current having a current value to be shifted to the closed state is supplied to the exciting coil of the solenoid valve that is in the open state. At this time, when the vibration acceleration calculated based on the sensor signal from the vibration sensor exceeds a predetermined value, that is, when vibration accompanying sliding of the movable core occurs, the movable core slides and opens. It is specified that the normal state has shifted from the valve state to the closed state. Further, when the calculated vibration acceleration does not exceed a predetermined value, that is, when vibration due to sliding of the movable core does not occur, it is specified that the abnormal state does not shift from the valve opening state to the valve closing state.

  Although not described in detail, in this detection apparatus, in addition to the above processing, whether or not vibration of vibration acceleration exceeding a predetermined value has occurred when the valve closing state should be maintained, A process is performed to determine whether the solenoid valve is in a normal state or an abnormal state based on whether vibration with a vibration acceleration exceeding a predetermined value has occurred when the valve is moved from the closed state to the open state. . Thereby, in this detection device, it is possible to detect whether or not the electromagnetic valve is operating normally without disposing a flow rate sensor in the water supply pipe.

Japanese Patent Laying-Open No. 2005-273835 (page 4-7, FIG. 1-2)

  However, the above detection device has the following problems. That is, in the detection device described above, based on the sensor signal from the vibration sensor attached to the electromagnetic valve, it is determined whether the movable core has slid when the driving current is supplied, and whether the electromagnetic valve is in a normal state or an abnormal state. A specific configuration is adopted. For this reason, in this detection device, it is possible to reduce the size of the flow sensor for specifying whether or not the solenoid valve is operating normally. However, since it is necessary to install the vibration sensor on the electromagnetic valve, it is necessary to perform a waterproof treatment on the vibration sensor, resulting in a problem that the manufacturing cost is increased.

  In addition, a solenoid valve that is a target for detection of an operating state may be installed in the vicinity of mechanical equipment that generates vibration during operation, or in the vicinity of a runway such as an automobile or a train. In such an environment, even though the movable core is not slid, vibration is detected by the vibration sensor, and the normal solenoid valve is identified as being abnormal, or the abnormal solenoid valve is normal. There is a risk of being identified as a state. For this reason, the detection device that identifies whether the electromagnetic valve is in a normal state or an abnormal state by detecting vibration generated when the movable core slides cannot be used in an environment in which vibration occurs other than when the movable core slides. There are also problems.

  The present invention has been made in view of such problems, and provides a solenoid valve control device and a solenoid valve system capable of accurately detecting the state of the solenoid valve under various environments while reducing the manufacturing cost. The main purpose.

  In order to achieve the above object, the solenoid valve control device according to claim 1 is inserted into a bobbin, an exciting coil formed by winding a conducting wire around a cylindrical portion of the bobbin, and one end of the cylindrical portion. A fixed core that is restricted from sliding with respect to the bobbin, a movable core that is inserted on the other end side of the cylindrical portion so as to be slidable with respect to the bobbin, and a portion of the cylindrical portion on the other end side. A movable core provided with an actuator including a yoke that is provided with a possible insertion hole and that is integrated with the bobbin to form a magnetic path in a state where the cylindrical portion is inserted through the insertion hole; Is controlled by an electromagnetic valve having a valve element attached to the opposite end, supplying a driving current to the exciting coil and sliding the movable core relative to the bobbin. Open and close An electromagnetic valve control device including a processing unit for performing control processing, comprising: an output unit that outputs a predetermined electrical parameter that changes in accordance with an inductance value of the exciting coil; and the processing unit includes: Based on the electrical parameter output from the output unit and the reference value for determination in a state in which the driving current is not supplied to the exciting coil, the movable core inserted in the exciting coil includes the solenoid valve. Position determination processing is performed to determine which position is the valve opening position where the valve body is spaced from the valve opening and the valve closing position where the valve body is in contact with the valve opening, A predetermined process is executed according to the result of the position determination process.

  The electromagnetic valve control device according to claim 2 is the electromagnetic valve control device according to claim 1, wherein the output unit includes an LC oscillation circuit configured to include the excitation coil, and the Either the oscillation frequency that changes according to the change in the insertion length of the movable core or the voltage value that changes according to the change in the oscillation frequency is output to the processing unit as the electrical parameter.

  Further, the electromagnetic valve control device according to claim 3 is the electromagnetic valve control device according to claim 1 or 2, wherein the processing unit is executed after the opening / closing control processing for sliding the movable core to the valve closing position. When it is determined in the position determination process that the movable core is located at the valve opening position, the opening / closing control process for sliding the movable core to the valve closing position is executed as the predetermined process. .

  Furthermore, the electromagnetic valve control device according to claim 4 is the electromagnetic valve control device according to any one of claims 1 to 3, wherein the processing unit slides the movable core to the valve closing position. When it is determined in the position determination process executed after that that the movable core is positioned at the valve opening position, the movable core is positioned at the valve opening position as the predetermined process. A notification process is performed to notify the user in an identifiable manner.

  According to a fifth aspect of the present invention, an electromagnetic valve system includes the electromagnetic valve control device according to any one of the first to fourth aspects and the electromagnetic valve.

  The electromagnetic valve control device according to claim 1, wherein the processing unit is inserted into the excitation coil based on an electrical parameter output from the output unit and a reference value for determination in a state where no driving current is supplied to the excitation coil. Position determination to determine whether the movable core is positioned at the valve open position where the valve element is separated from the valve opening of the solenoid valve or the valve closing position where the valve element is in contact with the valve opening A process is executed, and a process specified in advance according to the result of the position determination process is executed. The electromagnetic valve system according to claim 5 includes the electromagnetic valve control device and the electromagnetic valve.

  Therefore, according to the solenoid valve control device according to claim 1 and the solenoid valve system according to claim 5, the solenoid valve is closed or opened based on the flow rate detected through the flow sensor. The electromagnetic valve system can be sufficiently miniaturized in comparison with a device configured to determine whether or not an electric coil such as a vibration sensor is attached to the electromagnetic valve, and changes according to the inductance value of the exciting coil. Since the position of the movable core can be determined based on the electrical parameters, the manufacturing cost of the solenoid valve control device and the solenoid valve system is sufficiently reduced by the amount that eliminates the need for waterproofing of electrical components such as vibration sensors. be able to. Moreover, since the position of the movable core can be accurately detected even in an environment where vibration is generated other than when the movable core is slid, it is possible to determine whether the solenoid valve is closed or open in various environments. It can be determined accurately.

  According to the electromagnetic valve control device of claim 2 and the electromagnetic valve system including such an electromagnetic valve control device, the output unit includes an LC oscillation circuit including an excitation coil, A relatively simple configuration by outputting either the oscillation frequency that changes according to the change of the insertion length of the movable core to the coil or the voltage value that changes according to the change of the oscillation frequency to the processing unit as an electrical parameter. Nevertheless, the position of the movable core can be accurately determined. For this reason, the manufacturing cost of a solenoid valve control device and a solenoid valve system can be further reduced.

  Furthermore, according to the solenoid valve control device according to claim 3 and the solenoid valve system including such a solenoid valve control device, the processing unit is executed after the opening / closing control process for sliding the movable core to the valve closing position. When it is determined in the position determination process that the movable core is located at the valve open position, the opening / closing control process for sliding the movable core to the valve closing position is performed as a pre-defined process. The situation in which the state in which the solenoid valve to be kept remains in the open state and the state where the liquid is continuously supplied to the supply target can be suitably avoided.

  Furthermore, according to the solenoid valve control device according to claim 4 and the solenoid valve system including such a solenoid valve control device, the processing unit is executed after the opening / closing control process for sliding the movable core to the valve closing position. When it is determined in the position determination process that the movable core is located at the valve opening position, a notification process is performed to preferentially notify that the movable core is located at the valve opening position as a predetermined process. By doing so, it is possible to make the user or administrator accurately recognize that the solenoid valve that should be closed is still in the open state. Thereby, the return operation | work from an abnormal state can be started rapidly.

1 is a configuration diagram of a solenoid valve system 100. FIG. 1 is an external perspective view of a solenoid valve 1. FIG. 1 is a cross-sectional view of a solenoid valve 1. FIG. It is a fragmentary sectional view of the solenoid valve 1 in a valve closing state. It is a fragmentary sectional view of electromagnetic valve 1 in a valve open state.

  Embodiments of a solenoid valve control device and a solenoid valve system according to the present invention will be described below with reference to the accompanying drawings.

  An electromagnetic valve system 100 shown in FIG. 1 is an example of an “electromagnetic valve system”, and includes an electromagnetic valve 1 and a control device 2. The solenoid valve 1 is a “pilot solenoid valve” which is an example of a “solenoid valve”, and includes a valve body 10a and an actuator 10b attached to the valve body 10a as shown in FIG. According to the control, the passage of liquid such as tap water is restricted / allowable. As shown in FIG. 3, the valve body 10 a includes a first block 11, a second block 12, a main valve 13, and a pilot valve 14.

  The first block 11 is a member that forms an upstream space Si into which a liquid to be regulated / allowed to pass, and a downstream space So into which a liquid allowed to pass through flows. A pipe connected to a supply source (hereinafter also referred to as “supply source side pipe”: not shown) is connected to an introduction port Hi (a pipe connection port communicating with the upstream space Si), and a liquid supply destination A pipe connected to the pipe (hereinafter also referred to as “supply side pipe”: not shown) can be connected to a discharge port Ho (a pipe connection port communicating with the downstream space So). Yes. The second block 12 is a member that forms a pressure chamber Sp for controlling the opening and closing of the main valve 13 in combination with the first block 11 and the main valve 13. The first block is configured so as to sandwich the main valve 13. 11 and the actuator 10b in a state where the pilot valve 14 is attached.

  The main valve 13 is a “valve body (diaphragm)” that restricts / allows passage of the liquid flowing into the upstream space Si in the first block 11, and includes a main body portion 13 a, a valve membrane portion 13 b, and a spring 13 c. . In this case, in the solenoid valve 1 of this example, a small hole 13h (an orifice serving as a starting point of the pilot line) for allowing the liquid to flow into the pressure chamber Sp from the upstream space Si into the valve membrane portion 13b integrated with the main body portion 13a. ) Is formed. Further, in the electromagnetic valve 1 of this example, the spring 13c is attached so as to urge the main body portion 13a and the valve membrane portion 13b toward the valve port 11h of the first block 11 (inlet of the downstream space So), A configuration is adopted in which one end of the spring 13c is inserted into the small hole 13h of the valve membrane portion 13b and the inside of the small hole 13h is cleaned when the main body portion 13a and the valve membrane portion 13b are opened and closed.

  The pilot valve 14 is attached to the actuator 10 b and opens / closes the small hole 12 h of the second block 12. In the electromagnetic valve 1 of this example, the pilot valve 14 corresponds to a “valve element”, and the upper end portion of the small hole 12 h formed in the second block 12 corresponds to a “valve opening”.

  The actuator 10b is an example of an “actuator”. As shown in FIGS. 3 to 5, the actuator 10b includes a bobbin 21, an excitation coil 22, a mold case 23, a fixed core 24, a movable core 25, a spring 26, a yoke 27, and a magnet 28. It is prepared for. The bobbin 21 is a “winding frame” for forming the exciting coil 22, and a cylindrical portion 21 a that is an example of a “cylindrical portion” and flange portions 21 b and 21 b are integrally formed. The exciting coil 22 is configured by winding a conducting wire around a cylindrical portion 21 a in the bobbin 21. In this case, both ends of the conducting wire constituting the exciting coil 22 are connected to a signal line 22a (see FIGS. 2 and 3), and are connected to the control device 2 via the signal line 22a. The mold case 23 seals the exciting coil 22 in combination with the bobbin 21 by insert molding in which the bobbin 21 in a state where the exciting coil 22 (conductive wire) is wound is molded (ensures insulation and excites the magnet). The coil 22 is prevented from getting wet or damaged).

  The fixed core (fixed iron core: plug nut) 24 is formed in a substantially cylindrical shape and is inserted into one end portion side (the upper end portion side in FIGS. 3 to 5) of the cylindrical portion 21 a of the bobbin 21, and will be described later. Is integrated with the bobbin 21 by the yoke 27 so that the sliding is restricted. The movable core (movable iron core: plunger) 25 is formed in a substantially cylindrical shape having substantially the same diameter as the fixed core 24, and can be slid with respect to the bobbin 21. The other end side of the cylindrical portion 21a (the lower end in FIGS. 3 to 5) Part side). In this case, the electromagnetic valve 1 (actuator 10b) of this example employs a configuration in which the pilot valve 14 is attached to the end of the movable core 25 opposite to the fixed core 24 (the lower end in FIGS. 3 to 5). ing. The spring 26 is disposed between the fixed core 24 and the movable core 25 and urges the fixed core 24 in a direction to separate the movable core 25.

  The yoke 27 forms a magnetic path (magnetic path extending from one end side of the cylindrical portion 21a to the other end portion) connecting the fixed core 24 and the movable core 25 inserted in the cylindrical portion 21a around the mold case 23. A path forming member, which is a U-shaped member in a front view and a flat plate-like member, are fixed to each other by caulking so as to sandwich the bobbin 21 and the excitation coil 22 molded by the mold case 23, whereby the bobbin 21, the exciting coil 22, the mold case 23, and the fixed core 24. In this case, in the yoke 27 of this example, the insertion hole 27a through which the portion of the bobbin 21 on the other end side (the side where the movable core 25 is inserted) of the cylindrical portion 21a can be inserted is one end surface (in this example, a flat plate shape). The insertion hole 27b through which the positioning convex portion of the fixed core 24 inserted into the one end portion side of the cylindrical portion 21a can be inserted into the other end surface (in this example, a U-shape in front view). Member).

  The magnet 28 is a permanent magnet for latching the movable core 25 (regulating sliding of the movable core 25), and surrounds the cylindrical portion 21a protruding from the insertion hole 27a of the yoke 27 (each of the outer surfaces of the yoke 27). It is removably attached around the insertion hole 27a in the lower surface in the drawing. In this case, in the electromagnetic valve 1 (actuator 10b) of this example, the ring magnet (magnetized so that either one of the surface in contact with the yoke 27 and the back surface thereof is the S pole and the other surface is the N pole ( The magnet 28 is composed of a magnet magnetized in the thickness direction, and as an example, a configuration is adopted in which the magnet 28 is attached to the yoke 27 so as to contact the surface that is the S pole.

  Further, according to the use of the electromagnetic valve system 100, the actuator 10 b is configured such that the electromagnetic valve 1 is made a “latch type electromagnetic valve” by attaching a magnet 28 to the yoke 27 as shown in FIGS. Instead, by attaching a spacer having the same shape as the magnet 28 (for example, a washer made of non-magnetic material: for example, a resin washer made of polyacetal resin: not shown), each component other than the magnet 28 is changed. The electromagnetic valve 1 can be made to be a “non-latching electromagnetic valve” without doing so. In the following description, as an example, a state in which the magnet 28 is attached to the yoke 27, that is, an example in which the electromagnetic valve 1 is used as a “latch type electromagnetic valve” will be described.

  The control device 2 is an example of an “electromagnetic valve control device”, and controls the supply of liquid to the object by moving the electromagnetic valve 1 to either a valve open state or a valve close state. As shown in FIG. 1, the control device 2 includes a drive circuit 31, an LC oscillation circuit 32, an fV conversion circuit 33, a comparator 34, and a processing unit 35. The drive circuit 31 constitutes a “processing unit” in combination with the comparator 34 and the processing unit 35, and supplies a driving current to the electromagnetic valve 1 (excitation coil 22) according to the control signal S 1 output from the processing unit 35. As a result, the movable core 25 is slid with respect to the bobbin 21 (excitation coil 22), thereby executing the opening / closing control process for shifting the solenoid valve 1 from the open state to the closed state or from the closed state to the open state. To do.

  The LC oscillation circuit 32 is configured such that the exciting coil 22 of the actuator 10b is “L (inductor)” and has a capacitor (value “C”) so that the oscillation frequency is frequency (= 1 / (2π√L · C). The “LC oscillation circuit” is an example of an “output unit” in combination with the fV conversion circuit 33. As will be described later, the LC oscillation circuit 32 has a movable core 25 with respect to the excitation coil 22. A signal Sf that can specify an oscillation frequency that changes according to the change in the insertion length is output, where the state of the electromagnetic valve 1 (valve open / closed state), the insertion length of the movable core 25 with respect to the exciting coil 22, and The mutual relationship between the oscillation frequencies of the LC oscillation circuit 32 will be described in detail later.

  The fV conversion circuit 33 is an example of a signal Sv indicating a voltage value obtained by performing fV conversion on the frequency of the signal Sf output from the LC oscillation circuit 32 (“predetermined electrical parameter that changes according to the inductance value of the exciting coil”). (An example of a voltage value that changes in response to a change in oscillation frequency) is output. The relationship between the frequency of the signal Sf output from the LC oscillation circuit 32 and the voltage value of the signal Sv output from the fV conversion circuit 33 will be described in detail later.

  For example, the comparator 34 outputs the high-level specifying signal S2 when the voltage value of the signal Sv output from the fV conversion circuit 33 is equal to or higher than a predetermined voltage value (an example of “determination reference value”). When the voltage value of the signal Sv output from the fV conversion circuit 33 is lower than the above-mentioned predetermined voltage value, the low-level specifying signal S2 is output.

  The processing unit 35 generally controls the electromagnetic valve system 100. Specifically, the processing unit 35 outputs the control signal S1 to the drive circuit 31 and supplies the drive current from the drive circuit 31 to the actuator 10b (excitation coil 22), thereby opening the electromagnetic valve 1 from the open state. The valve is moved to the closed state, or the valve is moved from the closed state to the opened state.

  Further, the processing unit 35 determines that the movable core 25 of the actuator 10b is based on the specifying signal S2 output from the comparator 34 in a state where the driving circuit 31 does not supply the driving current to the actuator 10b (excitation coil 22). It is located at either the valve open position where the pilot valve 14 is spaced from the edge (valve) of the small hole 12h or the valve closed position where the pilot valve 14 is in contact with the edge of the small hole 12h. A position determination process for determining whether or not The relationship between the specifying signal S2 output from the comparator 34 and the position of the movable core 25 will be described in detail later.

  Further, the processing unit 35 executes “predetermined processing” according to the result of the position determination processing. Specifically, the processing unit 35 outputs the control signal S1 to the drive circuit 31 to execute the opening / closing control process for sliding the movable core 25 of the actuator 10b to the valve closing position. When it is determined that is positioned at the valve opening position, “opening / closing control processing” for sliding the movable core 25 to the valve closing position is executed again as “predetermined processing” (execution of retry processing). In addition, the processing unit 35 outputs the control signal S1 to the drive circuit 31 to execute the opening / closing control process for sliding the movable core 25 to the valve opening position, so that the movable core 25 is positioned at the valve closing position in the position determination process. When it is determined that the opening is performed, the “opening / closing control process” for sliding the movable core 25 to the valve opening position is executed again as the “predetermined process” (execution of the retry process).

  Furthermore, as an example, the processing unit 35 executes the “open / close control process (retry process)” as the “predetermined process” three times, and the movable core 25 should be positioned at the valve closing position. Is positioned at the valve opening position or when the movable core 25 that should be positioned at the valve opening position is positioned at the valve closing position, the solenoid valve 1 is normally controlled by turning on an indicator (not shown). The “notification process” for notifying that it cannot be performed is executed. The “notification process” is not limited to the configuration that is executed when the “retry process” as described above is not improved, and the “retry process” is performed when the result of the position determination process is not normal. It is also possible to employ a configuration in which only the “notification process” is executed without executing the “retry process” in parallel.

  In using the electromagnetic valve system 100, first, the electromagnetic valve 1 is connected between the supply source side piping and the supply destination side piping. Specifically, the supply source side pipe is connected to the introduction port Hi of the valve body 10a in the solenoid valve 1, and the supply destination side pipe is connected to the discharge port Ho. In this case, in the electromagnetic valve 1 in the electromagnetic valve system 100 of this example, as shown in FIG. 3, the main body 13a and the valve membrane 13b are moved by the spring 13c into the valve opening 11h in the first block 11 (inlet of the downstream space So). The valve port 11h is closed by the valve membrane portion 13b. Therefore, the liquid that has flowed into the upstream space Si from the introduction port Hi through the supply source side piping is in a state where the passage of the liquid from the upstream space Si to the downstream space So is restricted by the main valve 13.

  In actuality, after the two pipes are connected, when the pilot valve 14 is opened and closed a plurality of times for the operation test, the liquid flowing from the upstream space Si through the small hole 13h of the valve membrane portion 13b. As a result, the air in the pressure chamber Sp is discharged from the small hole 12h of the second block 12 to the downstream space So of the first block 11, and the pressure chamber Sp is filled with the liquid. In order to facilitate understanding, detailed description of the air venting operation in the pressure chamber Sp at the time of pipe connection (when the use of the solenoid valve 1 is started) will be omitted.

  In this case, in this solenoid valve system 100, the drive circuit 31 of the control device 2 supplies the drive current to the exciting coil 22 of the actuator 10b in accordance with the control signal S1 from the processing unit 35, thereby closing the solenoid valve 1. From the valve state to the valve open state, liquid is supplied from the source side pipe to the destination (supply target) via the source side pipe, or the solenoid valve 1 is shifted from the valve open state to the valve closed state. A configuration is adopted in which the supply of liquid from the supply source side pipe to the supply destination (supply target) via the supply destination side pipe is stopped.

  Specifically, in this solenoid valve system 100, a drive current is supplied from the drive circuit 31 to the excitation coil 22 of the actuator 10b, and the movable core 25 is fixed by the excitation by the excitation coil 22 as shown in FIG. The small hole 12h (valve port) of the valve body 10a (second block 12) is moved by the pilot valve 14 attached to the movable core 25 by being slid to a position separated from the position (an example of “valve closing position”). It becomes a closed state (an example of a “valve closed state”). In this state, the sliding of the movable core 25 in the cylindrical portion 21a is regulated by the urging force of the spring 26 and the magnetic force of the magnet 28 attached to the yoke 27 (the movable core 25 is latched). Therefore, even if the supply of the drive current from the drive circuit 31 is stopped, the state where the small hole 12h is closed by the pilot valve 14 is maintained.

  For this reason, as shown in FIG. 3, the liquid flowing into the upstream space Si from the introduction port Hi flows into the pressure chamber Sp as shown by the arrow Lp1 from the small hole 13h in the main valve 13, and thereby the upstream space. The hydraulic pressure in Si and the hydraulic pressure in the pressure chamber Sp are almost equal. Therefore, the state in which the valve membrane portion 13b is pressed against the valve port 11h by the urging force of the spring 13c in the main valve 13 and the valve port 11h is closed is maintained. Thus, in the state where the movable core 25 is latched and the small hole 12h is closed by the pilot valve 14 as described above, the liquid supplied to the valve body 10a (the inlet Hi of the first block 11) passes. Is maintained in a regulated state.

  On the other hand, when supplying the liquid to the supply destination, a drive current having a polarity opposite to that when the movable core 25 is separated from the fixed core 24 as described above is supplied from the drive circuit 31 to the excitation coil 22. . At this time, as shown in FIG. 5, the movable core 25 is attached to the movable core 25 by being slid to a position (an example of “valve opening position”) in contact with the fixed core 24 by excitation by the excitation coil 22. The pilot valve 14 is separated from the small hole 12h (valve port) of the valve main body 10a (second block 12) and the small hole 12h is opened (an example of the “valve open state”). In this state, since the sliding of the movable core 25 in the cylindrical portion 21a is restricted by the magnetic force of the magnet 28 (the movable core 25 is latched), the supply of the drive current from the drive circuit 31 is stopped. Even so, the state where the small hole 12h is opened is maintained.

  Further, in the state where the small hole 12h is opened, the liquid in the pressure chamber Sp flows out from the small hole 12h to the downstream space So as indicated by an arrow Lp2 in FIG. It becomes lower than the hydraulic pressure in the side space Si. For this reason, as a result of the main valve 13 (main body portion 13a and valve membrane portion 13b) being pushed up against the urging force of the spring 13c by the hydraulic pressure in the upstream space Si, the valve membrane portion 13b is opened to the valve port 11h. The valve port 11h is opened away from the valve. As a result, the liquid in the upstream space Si flows between the first block 11 (the edge of the valve port 11h) and the main valve 13 (the valve membrane portion 13b) as shown by the arrow Lm1 in FIG. It passes through the opening 11h and flows into the downstream space So as indicated by an arrow Lm2. Thereby, the liquid in the downstream space So is supplied from the outlet Ho to the supply destination via the supply destination piping.

  Further, in a state where the small hole 12h of the valve main body 10a (second block 12) is opened, the flow of the liquid flowing from the upstream space Si into the downstream space So as indicated by arrows Lm1 and Lm2 is performed in parallel. The liquid in the upstream space Si flows into the pressure chamber Sp from the small hole 13h of the main valve 13 as shown by the arrow Lp1, and the liquid in the pressure chamber Sp flows downstream from the small hole 12h as shown by the arrow Lp2. It flows out into the space So. Therefore, in the state where the movable core 25 is latched and the small hole 12h is opened as described above, the state in which the hydraulic pressure in the pressure chamber Sp is lower than the hydraulic pressure in the upstream space Si is maintained. As a result, a state in which the passage of the liquid supplied to the valve body 10a (introduction port Hi of the first block 11) is allowed is maintained.

  Further, in order to stop the supply of the liquid to the supply destination, the movable core 25 is moved to a position (valve closed position) away from the fixed core 24 by supplying a drive current from the drive circuit 31 to the excitation coil 22 of the actuator 10b. The small hole 12h of the valve body 10a (second block 12) is closed by the pilot valve 14. At this time, as described above, the hydraulic pressure in the upstream space Si and the hydraulic pressure in the pressure chamber Sp become substantially equal, and the valve membrane portion 13b is pressed against the valve port 11h by the urging force of the spring 13c. The mouth 11h is closed. Thereby, the passage of the liquid supplied to the valve main body 10a (introduction port Hi of the first block 11) is regulated.

  In this case, in the solenoid valve 1 in the solenoid valve system 100 of the present example, the valve closed state shown in FIG. 4 (the movable core 25 is in the “valve closed position”) and the valve open state shown in FIG. The insertion length of the movable core 25 with respect to the excitation coil 22 is different from the state in which 25 is positioned at the “valve opening position”.

  Specifically, in the solenoid valve 1 in the closed state, as shown in FIG. 4, the pilot valve 14 is slid downward with respect to the bobbin 21, and the pilot valve 14 comes into contact with the mouth edge (valve port) of the small hole 12h. A gap having a length L1 is formed between the movable core 25 and the fixed core 24, so that the insertion length of the movable core 25 with respect to the exciting coil 22 wound around the bobbin 21 is equal to the length L2. Become. On the other hand, in the solenoid valve 1 in the open state, as shown in FIG. 5, the pilot valve 14 is slid upward with respect to the bobbin 21 to be separated from the edge (valve port) of the small hole 12 h. The movable core 25 comes into contact with the fixed core 24 (the gap with the length L1 does not exist), so that the insertion length of the movable core 25 with respect to the exciting coil 22 is the length L2 in the valve-closed state. The length L3 is longer than the length L1.

  For this reason, in the actuator 10b in the solenoid valve 1 in the valve-closed state and the actuator 10b in the solenoid valve 1 in the valve-open state, the excitation coil is caused by the difference in the insertion length of the movable core 25 (magnetic material) with respect to the excitation coil 22. The inductance value of 22 will be different. Specifically, from the inductance value of the exciting coil 22 in the closed state in which the insertion length of the movable core 25 located at the valve closing position into the exciting coil 22 is the length L2 (as an example, about 22.5 mH). However, the inductance value (for example, about 24.0 mH) of the exciting coil 22 in the valve-opening state in which the insertion length of the movable core 25 located at the valve-opening position into the exciting coil 22 is the length L3 is greater than the above. The value becomes larger by the length L1.

  Further, in the LC oscillation circuit 32 configured to include the exciting coil 22, the frequency (= 1) of the signal Sf when the movable core 25 is located at the valve closing position (the inductance value of the exciting coil 22 is small). / (2π√L · C). As an example, the frequency of the signal Sf in a state where the movable core 25 is located at the valve opening position (a state where the inductance value of the exciting coil 22 is large) than about 4.76 kHz ( As an example, about 3.70 kHz is lower. For this reason, in this electromagnetic valve system 100, the voltage value of the signal Sv obtained by fV conversion of the frequency of the signal Sf from the LC oscillation circuit 32 by the fV conversion circuit 33 in a state where the movable core 25 is located at the valve closing position (an example) As a result, the fV conversion circuit 33 performs fV conversion on the frequency of the signal Sf from the LC oscillation circuit 32 in the state where the movable core 25 is located at the valve opening position (about 3.1 V) (an example). (About 2.3V) is a smaller value.

  Therefore, in the solenoid valve system 100 (control device 2) of this example, as an example, when the voltage value of the signal Sv from the fV conversion circuit 33 is 2.7 V or more (the inductance value of the exciting coil 22 is 23.25 mH or less). , When the oscillation frequency of the LC oscillation circuit 32 is 4.23 kHz or higher), the comparator 34 outputs the high-level identification signal S2 to the processing unit 35, and the voltage value of the signal Sv from the fV conversion circuit 33 is 2 When the voltage is lower than 0.7V (when the inductance value of the exciting coil 22 exceeds 23.25 mH and the oscillation frequency of the LC oscillation circuit 32 is less than 4.23 kHz), the comparator 34 outputs the low-level identification signal S2. It is configured to output to the processing unit 35.

  Thereby, in the electromagnetic valve system 100 (control device 2) of this example, when the processing unit 35 outputs the high-level identification signal S2 from the comparator 34, the movable core 25 is positioned at the valve closing position. The movable core 25 is in the valve open position when the low level specifying signal S2 is output from the comparator 34 (the electromagnetic valve 1 is in the open position). It is possible to determine that the valve is open.

  Specifically, in the electromagnetic valve system 100 (control device 2) of this example, the processing unit 35 outputs the control signal S1 to the drive circuit 31 to execute the opening / closing control process for shifting from the valve opening state to the valve closing state. Then, it is determined whether the specifying signal S2 output from the comparator 34 is high level or low level. At this time, the movable core 25 is normally slid to the valve closing position by the above opening / closing control process, and the inductance value of the exciting coil 22 becomes about 22.5 mH. Is output, the processing unit 35 determines that the movable core 25 is located at the valve closing position, and the electromagnetic valve 1 has normally shifted to the valve closing state (an example of “position determination processing”).

  On the other hand, the movable core 25 does not slide to the valve closing position but remains in the valve opening position by the above opening / closing control process, and the inductance value of the exciting coil 22 becomes about 24.0 mH. When the low level specifying signal S2 is output from 34, the processing unit 35 is in an abnormal state in which the movable core 25 is located at the valve opening position and the electromagnetic valve 1 does not shift to the valve closing state. Determination (another example of “position determination processing”). At this time, as described above, the processing unit 35 causes the drive circuit 31 to output the control signal S1 and again perform the opening / closing control process (retry process) to shift to the valve closing state as the “predetermined process”. .

  As a result, when the high-level specifying signal S2 is output from the comparator 34, the processing unit 35 determines that the electromagnetic valve 1 has normally shifted to the closed state (an example of “position determination process”). In addition, when the low-level specifying signal S2 is output again from the comparator 34, an open / close control process (retry process) for outputting the control signal S1 to the drive circuit 31 and shifting to the valve-closing state again is performed in advance. Execute as “Process”. Further, when the high-level specifying signal S2 is not output from the comparator 34 even when such opening / closing control processing (retry processing) is repeated three times, the processing unit 35 turns on an indicator (not shown) to turn on the solenoid valve 1. The “notification process” for notifying that it cannot be normally controlled is executed.

  On the other hand, in the electromagnetic valve system 100 (control device 2) of this example, the processing unit 35 also executes the position determination process when the electromagnetic valve 1 is shifted from the closed state to the opened state. Specifically, the processing unit 35 outputs the control signal S1 to the drive circuit 31 to execute the opening / closing control process for shifting from the valve closing state to the valve opening state, and then the specifying signal S2 output from the comparator 34. Determine whether is high level or low level. At this time, the movable core 25 is normally slid to the valve opening position by the above opening / closing control process, and the inductance value of the exciting coil 22 becomes about 24.0 mH, whereby the low-level specifying signal S2 is output from the comparator 34. Is output, the processing unit 35 determines that the movable core 25 is located at the valve opening position, and that the electromagnetic valve 1 has normally shifted to the valve opening state (the “position determination process” is still another Example).

  On the other hand, the movable core 25 does not slide to the valve opening position but remains in the valve closing position by the above opening / closing control process, and the inductance value of the exciting coil 22 becomes about 22.5 mH. When the high-level identification signal S2 is output from 34, the processing unit 35 is in an abnormal state in which the movable core 25 is positioned at the valve closing position and the electromagnetic valve 1 does not shift to the valve opening state. Determination (a further example of “position determination processing”). At this time, as described above, the processing unit 35 outputs the control signal S1 to the drive circuit 31 and executes the opening / closing control process (retry process) for causing the drive circuit 31 to shift to the valve opening state again as the “predetermined process”. .

  As a result, when the low-level specifying signal S2 is output from the comparator 34, the processing unit 35 determines that the electromagnetic valve 1 has successfully shifted to the open state (a further example of the “position determination process”). ). In addition, when the high-level specifying signal S2 is output again from the comparator 34, an open / close control process (retry process) for outputting the control signal S1 to the drive circuit 31 and switching to the valve opening state again is performed in advance. Execute as “Process”. Further, when the low-level specifying signal S2 is not output from the comparator 34 even if such opening / closing control processing (retry processing) is repeated three times, the processing unit 35 turns on an indicator (not shown) to turn on the solenoid valve 1. The “notification process” for notifying that it cannot be normally controlled is executed.

  As described above, in the control device 2, the “processing unit (in this example, the drive circuit 31, the comparator 34, and the processing unit 35)” does not supply a driving current to the excitation coil 22. In this example, “predetermined electrical parameters (voltage value of signal Sv output from fV conversion circuit 33 in this example)” output from “LC oscillation circuit 32 and fV conversion circuit 33)” and “determination The movable core 25 inserted in the exciting coil 22 is connected to the “valve port (in this example, a small hole in this example) based on the reference value for use (a threshold value defined in the comparator 34 in this example)”. Position determination processing for determining whether the pilot valve 14 is located away from the 12h mouth edge) or the closed position where the pilot valve 14 is in contact with the "valve mouth". Execute and position determination Depending on the sense of the results to perform the "pre-defined process". The electromagnetic valve system 100 includes the control device 2 and the electromagnetic valve 1 described above.

  Therefore, according to the control device 2 and the electromagnetic valve system 100, the control device 2 and the electromagnetic valve system 100 are compared with an apparatus configured to determine whether the electromagnetic valve 1 is in the closed state or the open state based on the flow rate detected through the flow rate sensor. Thus, the electromagnetic valve system 100 can be sufficiently miniaturized, and can be moved based on the voltage value that changes according to the inductance value of the exciting coil 22 without attaching an electrical component such as a vibration sensor to the electromagnetic valve 1. Since the position of the core 25 can be determined, the manufacturing costs of the control device 2 and the electromagnetic valve system 100 can be sufficiently reduced to the extent that waterproofing of electrical components such as a vibration sensor is not necessary. Further, since the position of the movable core 25 can be accurately detected even in an environment where vibration is generated other than when the movable core 25 is slid, it is possible to determine whether the electromagnetic valve 1 is closed or open. Accurate judgment can be made under the environment.

  Further, according to the control device 2 and the electromagnetic valve system 100, the “output unit” is configured such that the LC oscillation circuit 32 is formed including the excitation coil 22, and the movable core 25 with respect to the excitation coil 22 is configured. “Electrical parameter (voltage of signal Sv output from fV conversion circuit 33 in this example) that changes according to“ oscillation frequency (frequency of signal Sf) ”of LC oscillation circuit 32 that changes according to change in insertion length Value) ”as“ predetermined electrical parameters ”to the“ processing unit ”, the position of the movable core 25 can be accurately determined despite the relatively simple configuration. For this reason, the manufacturing cost of the control apparatus 2 and the solenoid valve system 100 can be further reduced.

  Further, according to the control device 2 and the electromagnetic valve system 100, the movable processing unit 25 opens the movable core 25 in the position determination process executed after the “opening / closing control process” for sliding the movable core 25 to the closed position. When it is determined that the valve is in the position, as the “predetermined process”, an “open / close control process” for sliding the movable core 25 to the valve-closed position is executed, so that the solenoid valve to be closed It is possible to suitably avoid a situation in which the state in which the liquid 1 continues to be supplied to the supply target while 1 remains in the open state.

  Further, according to the control device 2 and the electromagnetic valve system 100, the movable processing unit 25 opens the movable core 25 in the position determination process executed after the “opening / closing control process” for sliding the movable core 25 to the closed position. When it is determined that the movable core 25 is located at the position, the “notification process (in this example, the indicator By performing “lighting)”, it is possible to make the user or the administrator accurately recognize that the solenoid valve 1 that should be in the closed state remains in the open state. Thereby, the return operation | work from an abnormal state can be started rapidly.

  Note that the configurations of the “solenoid valve control device” and the “solenoid valve system” are not limited to the configuration examples of the control device 2 and the solenoid valve system 100 described above. For example, an example in which the magnet 28 is attached to the yoke 27 and the solenoid valve 1 is used as a “latch type solenoid valve” has been described as an example. Also when using as, it can detect suitably whether the movable core 25 is located in a valve closing position. In this case, in the “solenoid valve system” equipped with the “non-latching solenoid valve”, the drive current is supplied to the “excitation coil” from the transition from the closed state to the open state until the return to the closed state. Although it is necessary to continue, when shifting to the valve-closed state or maintaining the valve-closed state, it is not necessary to supply a driving current to the “excitation coil”, and thus the control device 2 in the electromagnetic valve system 100 described above. Whether or not the “movable core” is in the “valve closing position” can be determined by the same configuration as in FIG.

  Specifically, as an example, in the electromagnetic valve system 100 including the non-latching electromagnetic valve 1 with the magnet 28 removed, the processing unit 35 stops supplying the driving current to the excitation coil 22, thereby causing the electromagnetic valve 1. After the “opening / closing control process” for shifting the valve to the valve closing state, the “position determination process” is executed, so that when the specifying signal S2 from the comparator 34 is at the high level, the movable core 25 is normally in the valve closing position. When it is determined that the valve has moved to the normally closed state and the specifying signal S2 is at a low level, the movable core 25 remains in the valve open position, and is in an abnormal state that cannot be shifted to the valve closed state. judge. Therefore, even in the electromagnetic valve system 100 including the non-latching electromagnetic valve 1, the same effect as that of the electromagnetic valve system 100 including the latching electromagnetic valve 1 can be achieved.

  Moreover, although the example of the control apparatus 2 which controls the solenoid valve 1 which is an example of a "pilot type solenoid valve" was demonstrated, it replaced with the solenoid valve 1 and replaced with the "direct acting solenoid valve" (not shown). An “opening / closing control process”, a “position determination process”, and the like can be executed by a “solenoid valve control device” having the same configuration as the control device 2 as a control target.

  Furthermore, the configuration for executing the “notification process” for notifying that an abnormal state is caused by the lighting of the indicator has been described as an example. However, instead of (or in addition to) such a configuration, a buzzer is used. The process of notifying the abnormal state with sound such as sound is executed as “notification process”, or the process of notifying the administrator of the “solenoid valve system” via the public line or the Internet is notified as “notification process”. It is also possible to adopt a configuration that is executed as “processing”.

  In addition, the configuration in which the position of the movable core 25 is specified using the voltage value of the signal Sv from the fV conversion circuit 33 as the “predetermined electrical parameter” has been described as an example. Further, it is possible to adopt a configuration in which the position of the movable core 25 is specified by using the frequency of the signal Sf from the LC oscillation circuit 32 as a “predetermined electrical parameter”. Further, it is possible to adopt a configuration in which the processing unit 35 performs digital processing on the signal Sv output from the fV conversion circuit 33 and executes position determination processing without using the comparator 34.

DESCRIPTION OF SYMBOLS 100 Solenoid valve system 1 Solenoid valve 2 Control apparatus 10a Valve main body 10b Actuator 12h Small hole 14 Pilot valve 21 Bobbin 21a Tube part 22 Excitation coil 22a Signal line 24 Fixed core 25 Movable core 26 Spring 27 York 27a, 27b Insertion hole 28 Magnet 31 Drive circuit 32 LC oscillation circuit 33 fV conversion circuit 34 Comparator 35 Processing section Hi introduction port Ho discharge port L1 to L3 length S1 control signal S2 identification signal Sf, Sv signal

Claims (5)

A bobbin, an exciting coil formed by winding a conductive wire around a cylindrical portion of the bobbin, a fixed core that is inserted into one end of the cylindrical portion and is restricted from sliding on the bobbin, and a slide on the bobbin A movable core inserted on the other end side of the cylindrical portion and an insertion hole through which the portion on the other end side of the cylindrical portion can be inserted are provided so that the cylindrical portion is inserted into the insertion hole. An electromagnetic valve having an actuator having a yoke integrated with the bobbin in a state where the bobbin is integrated to form a magnetic path and having a valve element attached to the end of the movable core opposite to the fixed core side As an electromagnetic valve control device comprising: a processing unit that supplies a driving current to the excitation coil and slides the movable core relative to the bobbin to open and close the electromagnetic valve.
An output unit that outputs a predetermined electrical parameter that changes according to the inductance value of the exciting coil;
The processing unit is inserted in the excitation coil based on the electrical parameter and the determination reference value output from the output unit in a state where the driving current is not supplied to the excitation coil. Position determination for determining whether the core is located at a valve opening position where the valve element is spaced from the valve opening of the electromagnetic valve or a valve closing position where the valve element is in contact with the valve opening An electromagnetic valve control device that executes a process and executes a process specified in advance according to a result of the position determination process.   The output unit includes an LC oscillation circuit configured to include the excitation coil, and an oscillation frequency that changes according to a change in the insertion length of the movable core with respect to the excitation coil, and a change in the oscillation frequency. The solenoid valve control device according to claim 1, wherein any one of the changing voltage values is output to the processing unit as the electrical parameter.   When the processing unit determines that the movable core is located at the valve opening position in the position determination process performed after the opening / closing control process for sliding the movable core to the valve closing position, The electromagnetic valve control device according to claim 1 or 2, wherein the opening / closing control processing for sliding the movable core to the valve closing position is executed as the prescribed processing.   When the processing unit determines that the movable core is located at the valve opening position in the position determination process performed after the opening / closing control process for sliding the movable core to the valve closing position, The electromagnetic valve control device according to any one of claims 1 to 3, wherein a notification process for notifying that the movable core is located at the valve opening position is performed as the specified process.   A solenoid valve system comprising the solenoid valve control device according to claim 1 and the solenoid valve.

Images