JP2017180752A - Electric valve control device, electric valve control method and electric valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric valve control device which can accurately control an opening/closing motion of a valve.SOLUTION: An electric valve control device 10 performs the intermittent drive control of a valve body 62 within a prescribed time T1 by alternately repeating the drive of a brushless motor 12 at a prescribed drive time T2 and a stop of the brushless motor 12 at a pause time T3 after the drive. The electric valve control device includes an acquisition part 22, a calculation part 21, and an intermittent drive control part 24 for performing the intermittent drive control at which the drive at the prescribed drive time T2 and the stop at the pause time T3 are alternately repeated. The calculation part 21 calculates a lapse time after a start of the first drive of the intermittent drive control up to each stop, and a remaining time which is obtained by subtracting the lapse time from the prescribed time T1, and calculates each pause time T3 on the basis of an actual operation angle which is acquired by the acquisition part 22 immediately before each stop, and the remaining time. The intermittent drive control part 24 opens the valve body 62 by a prescribed amount or closes the valve body by a prescribed amount within the prescribed time T1 on the basis of the prescribed drive time T2 and each pause time T3 which is calculated by the calculation part 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor-operated valve control device, a motor-operated valve control method, and a motor-operated valve for opening and closing a valve body.

  As a valve opening / closing control method, for example, a set opening corresponding to a set flow rate for a valve to be controlled is calculated from a loss coefficient for each of a plurality of openings set in advance in the controller and a differential pressure before and after the valve read into the controller. There has been proposed a method of calculating and opening / closing an opening / closing control signal to the valve until a deviation between the calculated set opening and the current opening reaches a predetermined range (see Patent Document 1).

  Further, as a valve opening / closing control method, for example, the output time and stop time of the valve opening command or valve closing command are set in advance, and the valve opening is adjusted by inching to control the process value to the target value. In the motorized valve control device, the stop time of the valve open command or valve close command is fixed, and the output time can be continuously changed according to the deviation between the target value and the process value by the output of the motorized valve output function circuit Has been proposed (see Patent Document 2).

  Generally, the operating speed of the valve body in the valve is affected by whether the valve opening operation is performed from the fully closed state or the valve opening operation is performed. For example, a ball valve is a rotary valve that seals a valve seat by pressing a ball valve body against an annular ball seat, and its operating torque is high in a fully open position or a fully closed position of the valve and low in an intermediate position. Therefore, even when the actuator is driven by the same output actuator (for example, a brushless motor), the operation speed of the ball valve body (the angle at which the ball valve body rotates per unit time) varies depending on the current position of the ball valve body. The operating speed of the valve body is also affected by the type and flow rate of the fluid, or the nominal pressure and nominal diameter of the valve. In the control to converge to the target value such as the set opening degree as in Patent Documents 1 and 2, it is not assumed that the speed of the valve body is controlled in accordance with the actual operation of the valve body. Further, depending on the use of the valve, there is a case where it is desired to operate the valve body slowly or quickly, and an electric valve control device that satisfies such a requirement has not been proposed.

JP 2001-242939 A JP 2011-102621 A

  The present invention relates to an electrically operated valve control device and an electrically operated valve control capable of accurately controlling an opening / closing operation of a valve, and particularly capable of accurately controlling an opening / closing operation of a predetermined amount within a predetermined time according to an actual operation of a valve body. A method and a motor-operated valve using the motor-operated valve control device are provided.

[Application Example 1]
The electric valve control device according to this application example is
A motor-driven valve control device that performs intermittent drive control of a valve body within a predetermined time by alternately repeating driving of a brushless motor during a predetermined driving time and stopping of the brushless motor during a rest time after the driving,
An acquisition unit that acquires each actual operation angle at which the valve body is actually operated in each drive of the brushless motor;
A calculation unit for calculating each pause time after each drive;
An intermittent drive control unit that performs the intermittent drive control that alternately repeats the drive in the predetermined drive time and the stop in the pause time;
Including
The calculation unit calculates an elapsed time from the first drive start to each stop of the intermittent drive control and a remaining time obtained by subtracting the elapsed time from the predetermined time, and the acquisition unit immediately before each stop Calculating each pause time based on the actual operating angle and the remaining time acquired by
The intermittent drive control unit causes the valve body to perform a predetermined amount opening operation or a predetermined amount closing operation within the predetermined time based on the predetermined driving time and the pause times calculated by the calculation unit. And

  According to the motor-operated valve control device according to this application example, since each pause time is calculated based on the actual operation angle, a predetermined amount of opening or closing operation is performed in a predetermined time according to the state of the opening or closing operation of the valve body. Can be accurately controlled.

[Application Example 2]
In the electric valve control device according to this application example,
The predetermined drive time may be determined based on a time from when the brushless motor starts to drive until a torque exceeding a rated torque is output.

  According to the motor-operated valve control device according to this application example, even if the predetermined time is increased, the rated torque can be output by intermittently repeating the driving with a plurality of predetermined driving times.

[Application Example 3]
In the electric valve control device according to this application example,
A continuous drive control unit for continuously driving the brushless motor to perform continuous drive control;
A setting unit for setting a set operation time from the full opening to the full closing of the valve body;
A determination unit that determines whether to perform the intermittent drive control or the continuous drive control;
Further including
The determination unit
When the set operation time is within a continuous drive time that can be continuously driven with the rated torque of the brushless motor, the continuous drive control unit outputs at least the rated torque to perform the continuous drive control,
When it is determined that the set operation time exceeds the continuous drive time, the intermittent drive control can be performed by the intermittent drive control unit.

  According to the motor-operated valve control device according to this application example, the brushless motor can be continuously driven with a high torque for a short time. Therefore, the brushless motor can be selected by selecting continuous drive control or intermittent drive control according to the set operation time. Regardless of the increase in the size of the motor, the settable operation time can be expanded.

[Application Example 4]
In the electric valve control device according to this application example,
The information processing apparatus may further include an alarm unit that outputs an alarm signal when each pause time calculated by the calculator is shorter than a predetermined pause time.

  According to the motor-operated valve control device according to this application example, it is possible to determine an abnormal operation of the valve body at an early stage based on whether or not the calculated pause time is shorter than the predetermined pause time, and output an alarm signal.

[Application Example 5]
In the electric valve control device according to this application example,
Based on the sum of the actual operating angles from the start of the first driving of the brushless motor acquired by the acquiring unit to the present, an alarm is issued when it is determined that the valve body has not operated the predetermined amount within the predetermined time. An alarm unit that outputs a signal may be further included.

  According to the motor-operated valve control device according to this application example, it is possible to reliably output an alarm signal based on the sum of the actual operating angles.

[Application Example 6]
The electric valve according to this application example is
The motor-operated valve control device;
A valve having the valve body connected to the brushless motor of the electric valve control device and a valve box having a valve seat in contact with the valve body;
It is characterized by including.

  According to the motor-operated valve according to this application example, it is possible to accurately control a predetermined amount of the opening or closing operation in a predetermined time according to the state of the actual opening or closing operation of the valve body.

[Application Example 7]
The electric valve control method according to this application example is
A motor-driven valve control method for performing intermittent drive control of a valve body within a predetermined time by alternately repeating driving of a brushless motor at a predetermined driving time and stopping of the brushless motor at a rest time after the driving,
A process of acquiring each actual operating angle at which the valve element is actually operated in each drive of the brushless motor;
A process of calculating each pause time after each drive;
A process of performing the intermittent drive control that alternately repeats the drive in the predetermined drive time and the stop in the pause time;
Including
The calculating process calculates an elapsed time from the initial driving start to each stop of the intermittent drive control and a remaining time obtained by subtracting the elapsed time from the predetermined time, and the acquisition immediately before each stop Calculating each pause time based on the actual operation angle acquired by the unit and the remaining time,
The intermittent drive control is characterized in that, based on the predetermined drive time and the calculated pause times, the valve body is operated to open a predetermined amount or close a predetermined amount within the predetermined time.

  According to the motor-operated valve control method according to this application example, since each pause time is calculated based on the actual operation angle, a predetermined amount of opening operation or closing operation is performed in a predetermined time according to the state of the opening operation or closing operation of the valve body. Can be accurately controlled.

[Application Example 8]
In the electric valve control method according to this application example,
The predetermined drive time may be determined based on a time from when the brushless motor starts to drive until a torque exceeding a rated torque is output.

According to the motor-operated valve control method according to this application example, even if the predetermined time becomes longer, the rated torque can be output by intermittently repeating the driving with the predetermined driving time a plurality of times.

1 is a longitudinal sectional view of an electric valve control device and a ball valve according to an embodiment. It is a block diagram for demonstrating the electrically operated valve control apparatus which concerns on one Embodiment. It is a graph for demonstrating transition of the output in the continuous drive of a brushless motor. It is a graph for demonstrating transition of the output of a brushless motor in predetermined drive time. It is a flowchart explaining the process of the determination part in the electrically operated valve control apparatus which concerns on one Embodiment. It is a flowchart explaining the intermittent drive control in the electrically operated valve control apparatus which concerns on one Embodiment. It is a time chart which shows the operation pattern of intermittent drive control in the motor operated valve control device concerning one embodiment. It is a flowchart explaining the process of the alarm part in the electrically operated valve control apparatus which concerns on one Embodiment. It is a flowchart explaining another process of the alarm part in the electrically operated valve control apparatus which concerns on one Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. In addition, not all of the configurations described below are essential constituent requirements of the present invention.

  The motor-operated valve control device according to the present embodiment performs intermittent drive control of the valve body within a predetermined time by alternately repeating the driving of the brushless motor during a predetermined driving time and the stopping of the brushless motor during the rest time after the driving. An electric valve control device that performs an acquisition unit that acquires each actual operating angle at which the valve body is actually operated in each drive of the brushless motor, and a calculation unit that calculates each pause time after each drive And an intermittent drive control unit that performs the intermittent drive control that alternately repeats the drive in the predetermined drive time and the stop in the pause time, and the calculation unit starts the first drive of the intermittent drive control And the remaining time obtained by subtracting the elapsed time from the predetermined time, and the acquisition unit immediately before each stop acquires Each pause time is calculated based on the actual operation angle and the remaining time, and the intermittent drive control unit is based on the predetermined drive time and each pause time calculated by the calculation unit, The valve element is opened or closed by a predetermined amount within the predetermined time.

Further, the motor-driven valve control method according to the present embodiment repeats alternately driving the brushless motor during a predetermined drive time and stopping the brushless motor during the rest time after the drive, thereby intermittently controlling the valve body within the predetermined time. A process for obtaining each actual operating angle at which the valve body is actually operated in each drive of the brushless motor, and a process for calculating each pause time after each drive And the process of performing the intermittent drive control that alternately repeats the drive in the predetermined drive time and the stop in the pause time, and the process of calculating each stop from the first drive start of the intermittent drive control And the remaining time obtained by subtracting the elapsed time from the predetermined time, before the acquisition unit acquired immediately before each stop Each pause time is calculated based on the actual operating angle and the remaining time, and the intermittent drive control is performed within the predetermined time based on the predetermined drive time and the calculated pause time. The valve body is opened by a predetermined amount or closed by a predetermined amount.

1. Motorized valve control device and motorized valve An outline of the motorized valve control device 10 in the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of an electric valve control device 10 and a ball valve 60 according to an embodiment, and FIG. 2 is a block diagram for explaining the electric valve control device 10 according to an embodiment.

  FIG. 1 shows an electric valve 70 including an electric valve control device 10 and a ball valve 60 as an example of a valve. The electric valve control device 10 is fixed to the ball valve 60. The electric valve 70 is configured by integrating the electric valve control device 10 and the ball valve 60. As the valve used for the motor-operated valve 70, a ball valve 60, particularly a screw connection type floating ball valve having a nominal diameter of 1/4 to 2B, which is used for flow rate control (that is, proportional control) proportional to the control signal is suitable. Further, in the motor-operated valve control device 10 of the present embodiment, a set operation time Td (that is, the time required from the fully open to the fully closed of the ball valve 60) to be described later is, for example, in a range of about 3 seconds to 30 seconds, The rated torque of the brushless motor 12 is 8 Nm, for example. The valve to which the electric valve control device 10 can be applied is not limited to the ball valve 60 and can be applied to a known valve such as a butterfly valve.

  The ball valve 60 includes a valve box 61, a fluid passage 63 penetrating the valve box 61, a substantially spherical valve body 62 provided in the middle of the fluid passage 63, and valve bodies on the inlet side and the outlet side of the fluid passage 63. Annular seats 65 and 65 that are valve seats in contact with 62, and a valve rod 64 that serves as a rotation shaft of the valve body 62. The seats 65 and 65 are provided in the valve box 61.

  The valve body 62 of the ball valve 60 has a through-hole having substantially the same diameter as the fluid passage 63 that penetrates in a direction orthogonal to its own rotation axis, and the fluid passage 63 opens and closes when the valve body 62 rotates.

  The electric valve control device 10 includes a casing 11 fixed to the valve box 61 with bolts (not shown), a brushless motor 12 disposed inside the casing 11, and a valve rod 64 of a ball valve 60 at one end. An output shaft 14 connected to the output shaft 14, a gear portion 13 having a plurality of gears for transmitting the rotation of the brushless motor 12 to the output shaft 14, a position detector 15 for measuring the rotation angle of the output shaft 14, and the brushless motor 12. The control part 20 to perform, and the setting part 18 which sets the various conditions provided with the display function are included.

  The electric valve control device 10 drives the brushless motor 12 a plurality of times in a predetermined drive time T2 (described later with reference to FIGS. 4 to 7), and opens the valve body 62 by a predetermined amount or a predetermined amount within the predetermined time T1. Intermittent drive control for closing operation can be performed. The predetermined drive time T2 is a time determined in advance in the intermittent drive control. The predetermined time T1 is a time determined when a predetermined amount of opening operation or closing operation is to be obtained based on the set operation time Td set for each electric valve control device 10. For example, in the ball valve 60, when the time (set operation time Td) required from fully closed (90 °) to fully open (0 °) is set to 27 seconds, from fully closed (90 °) to fully open (0 ° For example, if the opening operation of a predetermined amount arbitrarily set in the range up to 6) is, for example, 6 °, the opening operation must be performed by 6 ° at 1/15 of the setting operation time Td, so the predetermined time T1 is 1.8 seconds. It becomes. Thus, the predetermined time T1 is a time determined according to a predetermined amount of opening operation or closing operation that is arbitrarily set from fully closed to fully open, and is, for example, from an intermediate opening to an intermediate opening (for example, The time required for the operation from 45 ° to 60 °) or the time required for the operation from the intermediate opening to the fully closed or fully opened, or vice versa.

The control unit 20 includes a CPU that executes various programs mounted on the board, a ROM that records programs, a RAM that temporarily stores data, an input / output port connected to the brushless motor 12, the position detector 15, and the like. Etc. A portion of the substrate of the control unit 20 is notched, and the brushless motor 12 is disposed in the notched portion. This is to make the casing 11 compact. A part of the control unit 20 may be mounted on the substrate of the setting unit 18.

  As shown in FIG. 2, the control unit 20 includes a brushless motor 12, a position detector 15 including an encoder, a power supply unit 17 for supplying power from an external power source, a setting unit 18 for performing various settings by a user, The alarm unit 19 is electrically connected. In addition, although the example which connects the power supply part 17 to AC power supply was shown in FIG. 2, you may connect to DC power supply.

  The control unit 20 calculates a pause time T3 for stopping the brushless motor 12; an acquisition unit 22 that acquires each actual operation angle at which the valve body 62 is actually operated in each drive of the brushless motor 12. A determination unit 23 that determines whether to perform intermittent drive control or continuous drive control, and intermittent drive control that alternately repeats driving of the brushless motor 12 during a predetermined drive time T2 and stopping of the brushless motor 12 during a pause time T3. The intermittent drive control part 24 and the continuous drive control part 25 which continuously drives the brushless motor 12 and performs continuous drive control are included.

  The calculation unit 21 calculates a pause time T3 after each driving of the brushless motor 12. The calculation unit 21 calculates the elapsed time from the first drive start to each stop of the intermittent drive control and the remaining time obtained by subtracting the elapsed time from the predetermined time T1, and the acquisition unit 22 immediately before each stop acquires the time. A pause time T3 is calculated based on the actual operating angle and the remaining time. The pause time T3 is a value that is recalculated and changes every time the brushless motor 12 is driven for a predetermined drive time T2. Since each pause time T3 is calculated based on each actual operation angle, a predetermined amount of the opening or closing operation can be accurately controlled in the predetermined time T1 in accordance with the state of the opening or closing operation of the valve element 62.

  The setting unit 18 can set a set operation time Td from the fully open to fully closed (or from fully closed to fully open) of the valve body 62. The set operation time Td may be set by giving an external instruction to the setting unit 18. The set operation time Td is set when the user installs the motor-operated valve control device 10 and the ball valve 60 in the facility, and is usually not changed once set.

  The determination unit 23 determines whether to perform continuous drive control or intermittent drive control. Specifically, the determination unit 23 outputs at least the rated torque by the continuous drive control unit 25 and performs continuous drive control when the set operation time Td is within the continuous drive time that can be continuously driven by the rated torque of the brushless motor 12. When it is determined that the set operation time Td exceeds the continuous drive time, the intermittent drive control unit 24 performs intermittent drive control. Since the brushless motor 12 can be continuously driven with a high torque for a short time, it can be set regardless of the size of the brushless motor 12 by selecting the continuous drive control and the intermittent drive control according to the set operation time Td. It is possible to widen the range of the set operation time Td.

1.1. Setting Operation Time With reference to FIG. 3, the setting operation time Td will be described together with the characteristics of the brushless motor 12 of the motor-operated valve control device 10 (characteristics in a no-load state in which no valve is connected). FIG. 3 is a graph for explaining the transition of the output in the continuous drive of the brushless motor 12.

Here, the set operation time Td is such that the valve body 62 is operated by driving the brushless motor 12 so that the ball valve 60 is fully opened (the angle of the valve body 62 with respect to the fluid passage 63 is 0 °) and is fully closed (valve The time for which the angle of the body 62 to the fluid passage 63 is 90 °), or
This is the time for operating the ball valve 60 from the fully closed state to the fully open state. The set operation time Td can be appropriately set by the user according to the use of the ball valve 60 in advance within the allowable time range in the motor-operated valve control device 10. Therefore, generally, if the set operation time Td is set longer due to the nature of the brushless motor 12, the voltage supplied to the brushless motor 12 in order to operate the valve element 62 slowly is lowered, and the set operation time Td is reduced. If it is shortened, it is necessary to increase the voltage supplied to the brushless motor 12 in order to increase the operating speed of the valve body 62.

  As shown in FIG. 3, when the “set operation time Td (seconds) from fully open to fully closed” is taken on the horizontal axis and the output “torque (Nm)” of the brushless motor 12 is taken on the vertical axis, the set operation time Td is The measured torque decreases as the length increases. More specifically, when the brushless motor 12 is driven with a set operation time Td of 3.3 seconds, for example, the output torque exceeds 12 Nm, but when the brushless motor 12 is driven with a set operation time Td of 5.0 seconds, 8Nm. For example, if the rated torque in the motor-operated valve control device 10 required for the opening / closing operation of the ball valve 60 is set to 8 Nm, the set operation time can be set as long as the control only reduces the supply voltage to the brushless motor 12 (continuous drive control). Although Td cannot be set beyond 5.0 seconds, in this embodiment, when it is desired to use in a range where the set operation time Td exceeds 5.0 seconds, this limitation is achieved by using intermittent drive control. It has been resolved.

  Here, the rated torque varies depending on the type of the brushless motor 12, but the brushless motor 12 is increased in size to obtain a large rated torque. Since the brushless motor 12 is unsuitable for mounting on the ball valve 60 when the brushless motor 12 is enlarged, it is desired to reduce the size. Since the small brushless motor 12 does not have a sufficient output torque, the torque becomes insufficient when continuously driven for a long time. Therefore, when it is desired to slowly open and close the valve body 62, the motor-driven valve control device 10 uses a small set of brushless motors 12 to ensure a rated torque and a wide set operation time by using intermittent drive control. Td can be set.

1.2. Predetermined Drive Time The predetermined drive time T2 will be described with reference to FIG. FIG. 4 is a graph for explaining the transition of the output of the brushless motor 12 during the predetermined drive time T2.

  Here, the predetermined drive time T2 is each drive time when the brushless motor 12 is controlled to be intermittently driven, and is determined based on the time from when the brushless motor 12 starts to drive until the torque exceeding the rated torque is output. It is done.

  As shown in FIG. 4, when the brushless motor 12 starts driving, the output torque of the brushless motor 12 rapidly increases and reaches the rated torque (for example, set to “8 Nm” in FIG. 4). The predetermined drive time T2 in the intermittent drive control is determined based on the time from when the brushless motor 12 starts to drive until it outputs torque exceeding the rated torque. For example, when a short time has passed after exceeding the rated torque. Can be set. For example, the predetermined driving time T2 can be set to 300 milliseconds. Since the rated torque can be obtained even in a very short time of 300 milliseconds, the rated torque is pseudo-continuous by repeating this predetermined driving time T2 intermittently with the pause time T3 interposed therebetween. Therefore, even if the predetermined time T1 becomes longer, the rated torque can be output by intermittently repeating the driving with the predetermined driving time T2 a plurality of times. Note that the maximum value of the predetermined drive time T2 is set within a time during which the rated torque can be obtained.

2. Electric valve control method The electric valve control method according to the present embodiment is an intermittent operation in which the brushless motor 12 is driven a plurality of times in a predetermined drive time T2, and the valve body 62 is opened or closed for a predetermined amount within the predetermined time T1. Drive control is performed. As an explanation of the electric valve control method, specific processing of the electric valve control device 10 will be described using the flowcharts of FIGS. 5 and 6 and the time chart of FIG.

2.1. First, an example of processing in the determination unit 23 will be described with reference to FIG. FIG. 5 is a flowchart for explaining the processing of the determination unit 23 in the electric valve control device 10 according to the embodiment.

  The user sets the set operation time Td using the setting unit 18 of the motor-operated valve control device 10. The setting unit 18 may be an external computer that is electrically connected to the motor-operated valve control device 10.

  S10: It is determined whether the set operation time Td set by the user (the time from the fully open to the fully closed state of the valve body 62 or the time from the fully closed to the fully open) exceeds 5.0 seconds.

  S12: When the set operation time Td exceeds 5.0 seconds, intermittent drive control is performed. This is because the rated torque (8 Nm) cannot be obtained when the set operation time Td exceeds 5.0 seconds in the brushless motor 12 in the present embodiment as described with reference to FIG. Note that the rated torque and the set operation time Td are examples, and change according to the size of the brushless motor 12 according to the application.

  S14: If the set operation time Td is 5.0 seconds or less, continuous drive control is performed. If the set operation time Td is in the range of 5.0 seconds or less, the brushless motor 12 can be continuously driven at the rated torque (8 Nm), and therefore at least the rated torque is output to perform continuous drive control.

  Thus, since the brushless motor 12 can be continuously driven at the rated torque for a short time (the set operation time Td is 5.0 seconds or less), the continuous drive control and the intermittent drive control are selected according to the set operation time Td. Thus, regardless of the size of the brushless motor 12, the set operation time Td that can be set can be widened while ensuring the rated torque.

2.2. Continuous Drive Control Continuous drive control is processed by the continuous drive control unit 25. The continuous drive control unit 25 continuously drives the brushless motor 12 with the rated torque for the set operation time Td set by the setting unit 18.

2.3. Intermittent Drive Control The intermittent drive control in the intermittent drive control unit 24 will be described with reference to FIGS. 6 and 7. FIG. 6 is a flowchart for explaining intermittent drive control in the electric valve control apparatus 10 according to the embodiment. FIG. 7 is a time chart showing an operation pattern of intermittent drive control in the electric valve control apparatus 10 according to the embodiment. . Here, a case where the user sets the set operation time Td to 27 seconds will be described. That is, in FIG. 5, S12 is selected in S10, and the electric valve control device 10 starts intermittent drive control as follows.

The user gives an instruction to open the valve body 62 by a predetermined amount (for example, 6 °) (or may be a closing operation) to the electric valve control device 10. In the intermittent drive control unit 24, a predetermined drive time T2 (for example, 300 milliseconds) of the brushless motor 12 and a predetermined amount (for example, 3 °) that can be opened during the predetermined drive time T2 are set in advance when the motor-operated valve control device 10 is manufactured. In addition, since the set operation time Td (27 seconds) is set as described above, an instruction for opening operation by a predetermined amount (6 °) is given at a predetermined time T1 (for example, 1800 msec). Become. More specifically, as shown in FIG. 7A, this instruction is for the valve body 62 to be driven for a predetermined drive time T2 (300 milliseconds).
In the instruction, the valve body 62 is stopped for the rest time T3a (1200 msec) after being rotated by 3 ° for the first time, and further opened by rotating it 3 ° for the second predetermined driving time T2. is there. Note that the rotation angle of the valve body 62 at the predetermined drive time T2 is the same as that when the fluid is not flowing through the ball valve 60, that is, when the valve body 62 is opened or closed for the predetermined drive time T2 in the no load state. The measured value of the rotation angle.

  S20: First, the intermittent drive control unit 24 drives the brushless motor 12 for a predetermined drive time T2.

  S <b> 21: The acquisition unit 22 performs a process of acquiring each actual operation angle at which the valve body 62 is actually opened in each drive of the brushless motor 12. In FIG. 7B, the first actual operation angle acquired from the position detector 15 is 1.5 °. In other words, since only the half of the predetermined amount is rotated by driving the brushless motor 12 for the first time, it is expected that the valve can be opened only by 3 ° at the predetermined time T1 in the pause time T3a of 1200 milliseconds as the initial instruction.

  S22: The calculation unit 21 performs a process of calculating a pause time T3 for stopping the brushless motor 12 after each drive. That is, in FIG. 7B, the elapsed time from the start of the first drive of the brushless motor 12 to the first stop (here, the predetermined drive time T2) and the elapsed time from the predetermined time T1 (predetermined drive time T2) are shown. The subtracted remaining time (T1−T2 = 1500 msec) is calculated, and the first actual operation angle (the first time when the brushless motor 12 acquired by the acquisition unit 22 immediately before the stop actually opens the valve body 62) ( 1.5 °) and the calculated remaining time (1500 milliseconds), a first pause time T3b for stopping the brushless motor 12 is calculated. Here, since the actual operation angle was 1.5 °, it is assumed that the remaining opening operation is also intermittent operation by 1.5 °, and the opening operation is performed three times (3 × 1.5 ° in the remaining time (1500 msec)). ) To open 4.5 °. When the opening operation is performed three times (3 × T2 (300 msec) = 900 msec), the pause time T3b ((1500 msec−900 msec) / 3 = 200 msec) is calculated.

  S23: The intermittent drive control unit 24 stops the brushless motor 12 for each pause time T3 calculated by the calculation unit 21. In FIG. 7B, the first pause time T3 is T3b. Then, after elapse of the pause time T3b, as shown in (C) and (D) of FIG. 7, the process returns to S20 and the operations of S20 to S23 are repeated. That is, the predetermined drive time T2 for driving the brushless motor 12 and the calculated pause times T3 (T3c, T3d,...) Are alternately repeated until a predetermined amount (6 °) of opening operation is performed.

  FIG. 7C shows a state in which S20 and subsequent steps are executed again in S24 of FIG. Here, the acquisition unit 22 acquires that the second drive of the brushless motor 12 actually opens the valve body 62 by 2 °. In this way, the ball valve 60 always changes the ease of opening the valve body 62 due to the flow velocity of the fluid actually flowing through the fluid passage 63 and the friction caused by the contact between the valve body 62 and the seat 65. The calculation unit 21 recalculates according to the second actual operation angle, the second pause time T3c is calculated as 313 ms, and after the pause time T3c (313 ms) has elapsed, S20 and subsequent steps are further executed.

FIG. 7D shows a state in which the brushless motor 12 performs the third drive. The acquisition unit 22 acquires that the third drive of the brushless motor 12 actually opens the valve element 62 by 1.5 °. The calculation unit 21 recalculates according to the third actual operation angle, the third pause time T3d is calculated as 187 milliseconds, and after the pause time T3d has elapsed, the brushless motor 12 is driven for a predetermined drive time T2. . Although not shown here, the control unit 20 performs control to stop the brushless motor 12 when the opening degree of the valve body 62 reaches a predetermined amount based on the acquisition data of the acquisition unit 22. And a predetermined amount of opening operation (6 °) is performed at a predetermined time T1.

  According to the present embodiment, for example, even if the actual operating angle of the valve body 62 becomes small due to foreign matter in the fluid being caught between the valve body 62 and the seat 65 immediately before full closure, the intermittent operation is performed. The valve element 62 can be operated to the fully closed position within the predetermined time T1 while securing the rated torque by the drive control. In addition, if the valve body 62 does not fully close even by intermittent drive control, processing by the alarm unit 19 described later can be performed.

2.3. Continuous drive control Although not shown, when the user sets a set operation time Td at which a rated torque can be obtained even if the brushless motor 12 is continuously driven, the continuous drive control unit 25 performs continuous drive control. In the continuous drive control, during the set operation time Td, the brushless motor 12 is continuously driven with the rated torque, and the operation of opening the valve element 62 from the fully closed position (or the operation of fully closing the fully open position) is performed.

  As described above, according to the electric valve control method, the continuous drive control and the intermittent drive control are selected, so that the predetermined time T1 from the full open to the full close (or from the full open to the full close) in the ball valve 60 is wide. Can be set. In addition, according to the motor-operated valve control method, the pause time T3 is calculated each time based on the actual operating angle, so that a predetermined amount of opening operation or closing is performed at the predetermined time T1 according to the state of the opening operation or closing operation of the valve element 62. The operation can be controlled.

2.4. Processing of Alarm Unit An example of processing in the alarm unit 19 will be described with reference to FIG. FIG. 8 is a flowchart for explaining the processing of the alarm unit 19 in the motor-operated valve control device 10 according to the embodiment.

  As shown in FIG. 8, in S30, the alarm unit 19 outputs an alarm signal when each pause time T3 calculated by the calculator 21 in S22 in FIG. 6 is shorter than a predetermined pause time. By doing in this way, it is possible to determine an abnormal operation of the valve body 62 at an early stage and output an alarm signal depending on whether or not each calculated pause time T3 is shorter than the predetermined pause time. That is, when the pause time T3 is too short, the opening operation or the closing operation is hardly performed, and it is considered that the valve body 62 cannot be normally operated due to some trouble.

  As long as the warning signal can be notified to the user, a message or the like may be displayed on the display unit of the setting unit 18 or may be output from the motor-operated valve control device 10 to the outside.

  Moreover, the example of the other process in the alarm part 19 is demonstrated using FIG. FIG. 9 is a flowchart for explaining another process of the alarm unit 19 in the electric valve control apparatus 10 according to the embodiment.

  The intermittent drive control unit 24 may execute the process of FIG. 9 in parallel with the process of FIG. The intermittent drive control unit 24 determines whether or not the predetermined time T1 has elapsed from the start of the first drive of the brushless motor 12 (S40). If the predetermined time T1 has elapsed, the valve body 62 opens or closes. (S41).

If S41 is said example, the alarm part 19 will be predetermined time T1 (1800 milliseconds) based on the sum of each actual operation angle from the first drive start of the brushless motor 12 acquired by the acquisition part 22 to the present. When it is determined that the valve body 62 has not moved (opened or closed) by a predetermined amount (6 °), S43 is selected and an alarm signal is output. In addition, when a predetermined amount of operation (opening operation or closing operation) is performed within the predetermined time T1, S42 is selected and the brushless motor 12 is stopped. In this way, it is possible to reliably output an alarm signal based on the sum of the actual operating angles.

  In the above-described embodiment, the predetermined drive time T2 is a time determined to obtain a predetermined torque by the brushless motor 12 employed in the motor-operated valve control device 10, and has been described as a fixed value in the motor-operated valve control device 10. However, it may be a variable value. In that case, for example, when it was planned to be 3 ° in FIG. 7A but only 1.5 ° could be operated in FIG. 7B, the predetermined drive time T2 is slightly longer. (For example, 400 ms), a torque higher than 8 Nm may be obtained and operated. This is because a torque higher than the rated torque is ensured to approach the planned operation.

  Further, in the above-described embodiment, the torque required for the operation of the valve body 62 increases due to foreign matter in the fluid being caught between the valve body 62 and the seat 65 immediately before full closure, and the actual valve When the operating angle of the body 62 is expected to decrease or actually occurs, for example, intermittent driving control is selected automatically or manually, and the predetermined time T1 or the predetermined driving time T2 is set to a short time. The torque may be changed to output a torque exceeding the rated torque, and the valve body 62 may be operated to the fully closed position. If the valve element 62 does not fully close even when the predetermined time T1 or the predetermined driving time T2 is shortened, the above-described processing by the alarm unit 19 can be performed.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. In addition, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Electric valve control apparatus, 11 ... Housing | casing, 12 ... Brushless motor, 13 ... Gear part, 14 ... Output shaft, 15 ... Position detector, 17 ... Power supply part, 18 ... Setting part, 19 ... Alarm part, 20 ... Control part, 21 ... Calculation part, 22 ... Acquisition part, 23 ... Determination part, 24 ... Intermittent drive control part, 25 ... Continuous drive control part, 60 ... Ball valve, 61 ... Valve box, 62 ... Valve body, 63 ... Fluid passage, 64 ... valve rod, 65 ... seat, 70 ... motorized valve, Td ... set operation time, T1 ... predetermined time, T2 ... predetermined drive time, T3, T3a, T3b, T3c, T3d ... pause time

Claims (8)

A motor-driven valve control device that performs intermittent drive control of a valve body within a predetermined time by alternately repeating driving of a brushless motor during a predetermined driving time and stopping of the brushless motor during a rest time after the driving,
An acquisition unit that acquires each actual operation angle at which the valve body is actually operated in each drive of the brushless motor;
A calculation unit for calculating each pause time after each drive;
An intermittent drive control unit that performs the intermittent drive control that alternately repeats the drive in the predetermined drive time and the stop in the pause time;
Including
The calculation unit calculates an elapsed time from the first drive start to each stop of the intermittent drive control and a remaining time obtained by subtracting the elapsed time from the predetermined time, and the acquisition unit immediately before each stop Calculating each pause time based on the actual operating angle and the remaining time acquired by
The intermittent drive control unit causes the valve body to perform a predetermined amount opening operation or a predetermined amount closing operation within the predetermined time based on the predetermined driving time and the pause times calculated by the calculation unit. An electric valve control device. In claim 1,
The motor-driven valve control device according to claim 1, wherein the predetermined drive time is determined based on a time from when the brushless motor starts to drive until a torque exceeding a rated torque is output. In claim 1 or 2,
A continuous drive control unit for continuously driving the brushless motor to perform continuous drive control;
A setting unit for setting a set operation time from the full opening to the full closing of the valve body;
A determination unit that determines whether to perform the intermittent drive control or the continuous drive control;
Further including
The determination unit
When the set operation time is within a continuous drive time that can be continuously driven with the rated torque of the brushless motor, the continuous drive control unit outputs at least the rated torque to perform the continuous drive control,
The motor-operated valve control device, wherein the intermittent drive control is performed by the intermittent drive control unit when it is determined that the set operation time exceeds the continuous drive time. In any one of Claims 1-3,
The motor-operated valve control device further comprising an alarm unit that outputs an alarm signal when each of the pause times calculated by the calculator is shorter than a predetermined pause time. In any one of Claims 1-3,
Based on the sum of the actual operating angles from the start of the first driving of the brushless motor acquired by the acquiring unit to the present, an alarm is issued when it is determined that the valve body has not operated the predetermined amount within the predetermined time. The motor-operated valve control device further comprising an alarm unit for outputting a signal. The motor-operated valve control device according to any one of claims 1 to 5,
A valve having the valve body connected to the brushless motor of the electric valve control device and a valve box having a valve seat in contact with the valve body;
A motor-operated valve comprising: A motor-driven valve control method for performing intermittent drive control of a valve body within a predetermined time by alternately repeating driving of a brushless motor at a predetermined driving time and stopping of the brushless motor at a rest time after the driving,
A process of acquiring each actual operating angle at which the valve element is actually operated in each drive of the brushless motor;
A process of calculating each pause time after each drive;
A process of performing the intermittent drive control that alternately repeats the drive in the predetermined drive time and the stop in the pause time;
Including
The calculating process calculates an elapsed time from the initial driving start to each stop of the intermittent drive control and a remaining time obtained by subtracting the elapsed time from the predetermined time, and the acquisition immediately before each stop Calculating each pause time based on the actual operation angle acquired by the unit and the remaining time,
The intermittent drive control is characterized in that, based on the predetermined drive time and the calculated pause times, the valve body is operated to open a predetermined amount or close a predetermined amount within the predetermined time. Control method. In claim 7,
The motor-driven valve control method, wherein the predetermined drive time is determined based on a time from when the brushless motor starts to drive until a torque exceeding a rated torque is output.

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