JP2008138769A - Spring return type electric flow rate regulating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quantitatively report replacement timing of a return spring by automatically and accurately counting the number of times of spring return operations. <P>SOLUTION: A return operation completion position θSR is defined outside of a normal opening control range θ0-θ100 of a valve element 7. For example, the return operation completion position θSR is on a position lower than a full close position θ0 when a fail safe direction is defined as the full close direction. Number of times when the operation position of the drive shaft 1 reaches the return operation completion position θSR are counted as number of times of spring return operation, and is updated and retained in a nonvolatile memory. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a spring return type electric flow rate adjusting device having a function of forcibly returning an operation position of a drive shaft to a predetermined return operation end position by a return force of a return spring.

  Conventionally, as this type of spring return type electric flow rate adjusting device, an electric flow rate adjusting device such as a valve for flow rate control or a damper for air volume control has been used. In this spring return type electric flow rate adjusting device, torque is increased by transmitting the rotational force of the motor to the drive shaft via an electromagnetic clutch and a speed reduction mechanism, thereby controlling the opening degree of a flow rate regulating mechanism such as a valve or a damper. Do. The drive shaft is provided with a return spring.When the power to the electric flow control device is cut off due to a power failure, the electromagnetic clutch is disengaged, and the return regulating force of the return spring forcibly drives the flow control mechanism. Closed or fully open.

  FIG. 7 shows an example of a conventional spring return type electric valve (spring return type electric flow control device) (for example, see Patent Document 1). In the figure, 1 is a drive shaft, 2 is a return spring attached to the drive shaft 1, 3 is a speed reduction mechanism, 4 is an electromagnetic clutch, 5 is a motor, 6 'is a control unit, and 7 is an operating position of the drive shaft 1. Accordingly, a valve body (flow rate regulating mechanism) that regulates the flow rate of the fluid, and 8 is an opening degree sensor that detects the operating position of the drive shaft 1 as the current opening degree θpv of the valve body 7.

  In the spring return type motor operated valve 100 ′, the control unit 6 ′ operates by receiving a power supply (for example, AC 24 V) and sends a forward rotation command and a reverse rotation command to the motor 5. In addition, the electromagnetic clutch 4 is constantly supplied with power branched to the control unit 6 ′, is in clutch engagement, and the output shaft of the motor 5 is always rotationally coupled to the drive shaft 1 via the speed reduction mechanism 3.

  Thereby, the rotational force of the motor 5 is transmitted to the drive shaft 1 via the electromagnetic clutch 4 and the speed reduction mechanism 3, and the opening degree control of the valve body 7 is performed. In this case, the control unit 6 ′ sends a forward rotation command and a reverse rotation command to the motor 5 so that the current opening degree θpv of the valve body 7 matches the target opening degree θsp. When the motor 5 stops after receiving a forward rotation command or a reverse rotation command, the drive shaft 1 maintains the current operating position by the holding torque of the motor 5.

When the supply of power to the spring return type electric valve 100 ′ is interrupted due to a power failure or the like, the power to the electromagnetic clutch 4 is also cut off. For this reason, the electromagnetic clutch 4 is disconnected, the torque of the motor 5 is not transmitted to the drive shaft 1, the drive shaft 1 operates in the closing direction or the opening direction (fail-safe direction) by the return force of the return spring 2, and the valve body 7 is forcibly fully closed (θ0 ) Or fully open (θ100). This function is called a spring return function.

  In this spring return type motor operated valve 100 ', an operator confirms whether or not the spring return function works normally at the time of installation at the site or during periodic inspection. The operation confirmation of the spring return function (confirmation of the spring return operation) is performed by intentionally shutting off the power supply to the spring return type motor operated valve 100 'or a confirmation button attached to the spring return type motor operated valve 100' (see FIG. By pressing (not shown). When the confirmation button is pressed, the control unit 6 ′ receives a signal indicating that the confirmation button has been pressed as an operation confirmation command (spring return operation confirmation command) for the return spring 2, and disconnects the electromagnetic clutch 4. .

  In this spring return type motor operated valve 100 ′, the return spring 2 gradually gets tired and deteriorated every time the spring return operation is performed. Therefore, the manufacturer of the spring return type electric valve 100 'recommends that the upper limit value of the number of spring return operations be determined and that the return spring 2 be replaced when the upper limit value is exceeded.

JP 2002-174269 A Japanese Patent Laid-Open No. 10-332040 (Japanese Patent No. 3129677)

  Conventionally, however, the operator manually and visually confirms the spring return operation, which is cumbersome and has an operation error and an operation count error. In addition, there are cases where it is not possible to confirm the operation because it is installed in a place where an operator cannot easily approach it.

  In Patent Document 2, a detection body that transmits a position detection signal when the drive shaft rotates to the fully closed position and the fully open position of the valve body is provided, and the number of transmissions of the position detection signal of these detection bodies is integrated and displayed. Thus, the time for replacing the valve body and the seat ring is notified.

  However, in the technique disclosed in Patent Document 2, since the position detection signal is only transmitted when the drive shaft rotates to the fully closed position and the fully open position of the valve body, for example, the fail-safe direction is set to the fully closed direction. In this case, the number of transmissions is integrated without distinguishing between when the drive shaft is rotated to the fully closed position by normal opening control and when the drive shaft is rotated to the fully closed position by the spring return operation. For this reason, it is impossible to accurately count the number of times the spring return operation is performed, and determination of whether the return spring is normal or abnormal has to rely on the operator's visual confirmation as before.

  The present invention has been made to solve such problems, and the object of the present invention is to accurately count the number of spring return operations and automatically know the return spring replacement time. An object of the present invention is to provide a type electric flow control device.

  In order to achieve such an object, the first invention (the invention according to claim 1) is connected to a motor that rotates upon receiving power supply, and an output shaft of the motor via an electromagnetic clutch and a speed reduction mechanism. The drive shaft, the flow rate regulating mechanism that regulates the flow rate of the fluid according to the operating position of the drive shaft, the control unit that gives a command to the motor to control the opening degree of the flow rate regulating mechanism, and the electromagnetic clutch are disconnected. In the spring return type electric flow control device having a return spring that returns the operation position of the drive shaft to a predetermined return operation end position, the return operation end position is set outside the normal opening control range of the flow restriction mechanism. The number of times the operating position of the drive shaft reaches the return operation end position is counted as the number of spring return operations, and is updated and held in a non-volatile memory. A.

According to the present invention, the normal opening control range of the flow regulating mechanism is fully closed (θ0 ) To fully open (θ100), the return operation end point (θSR) is determined outside the opening range. For example, when the fail safe direction is the fully closed direction, the return operation end point position is determined at a position lower than the fully closed position. Thereby, only when the electromagnetic clutch is disengaged, the operating position of the drive shaft exceeds the normal opening control range and reaches the return operation end position, it is counted as the number of spring return operations. For example, when the electromagnetic clutch is disengaged upon receiving a spring return operation command, the operation position of the drive shaft is returned to the return operation end position by the return force of the return spring. At this time, the number of spring return operations is increased by 1, and updated and held in the nonvolatile memory. Further, when the power supply to the electric flow control device is shut off and the electromagnetic clutch is disconnected, the operating position of the drive shaft is returned to the return operation end position by the return force of the return spring. In this case, after the interruption of the power supply is restored, the number of spring return operations is increased by 1 and is updated and held in the nonvolatile memory.

  In the first invention, the number of spring return operations includes the number of spring return operations (NA) when a spring return operation confirmation command is received and the spring return operation when power supply is interrupted without receiving the spring return operation confirmation command. It is counted as a total value (NT = NA + NB) combined with the number of times (NB), and this is updated and held in the nonvolatile memory as the number of spring return operations. In the first invention, the number of spring return operations when power supply is interrupted includes the number of times when power supply is intentionally interrupted and the number of times when a power failure occurs.

  In the second invention (the invention according to claim 2), the number of times the operating position of the drive shaft reaches the return operation end position after receiving the spring return operation confirmation command is counted as the number of spring return operations. That is, only the number of spring return operations (NA) when a spring return operation confirmation command is received is counted, and the number of spring return operations (NB) when power supply is interrupted without receiving the spring return operation confirmation command. ) Is not counted. If the power supply is not shut off, it is possible to know the return spring replacement time only by the number of spring return operations (NA) when a spring return operation confirmation command is received.

  In the third invention (the invention according to claim 3), the number of times the operating position of the drive shaft reaches the return operation end point is counted as the total number of spring return operations, and the return operation after receiving the spring return operation confirmation command. The number of times the operating position of the drive shaft reaches the end position is counted as the number of spring return operation tests. That is, the total of the number of spring return operations (NA) when the spring return operation confirmation command is received and the number of spring return operations (NB) when the power supply is cut off without receiving the spring return operation confirmation command. The value is counted as the total number of spring return operations (NT = NA + NB), and the number of spring return operations when a spring return operation confirmation command is received is counted as the number of spring return operation tests (NA). In the third aspect of the invention, the number of spring return operations (NB) when the supply of power is interrupted without receiving a spring return operation confirmation command is calculated from the total number of spring return operations (NT) to the number of spring return operation tests (NA). It is possible to obtain by calculation by subtracting.

  In the first and second inventions, the number of spring return operations (NT, NA) held in the memory is notified by providing a display unit in the spring return type electric flow rate adjusting device or remotely via a network. You may make it notify to the ground. In this case, it is preferable to notify related information such as the ratio of the number of spring return operations (NTmax, NAmax) to the upper limit (NTmax, NAmax) together with the number of spring return operations (NT, NA). Related invention)).

  In the fifth invention (the invention according to claim 5), as in the third invention, the total number of spring return operations (NT) and the number of spring return operation tests (NA) held in the memory are notified. . In this case, together with the total number of spring return operations (NT) and the number of spring return operation tests (NA), the number of spring return operations (NB) when power supply is cut off without receiving a spring return operation confirmation command, etc. It is better to notify related information.

  According to the present invention, the return operation end point position is defined outside the normal opening control range of the flow restriction mechanism, and the number of times the drive shaft operation position reaches the return operation end position is counted. The number of spring return operations such as the total number of return operations and the number of spring return operation tests can be accurately counted separately from the normal opening control fully closed or fully opened. This makes it possible to automatically know when to replace the return spring without relying on visual confirmation.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an outline of a spring return operation confirmation system including an embodiment of a spring return type motor operated valve (spring return type electric flow rate adjusting device) according to the present invention. In this figure, the same reference numerals as those in FIG. 7 denote the same or equivalent components as those described with reference to FIG.

  In this embodiment, the control unit 6 of the spring return type motor operated valve 100 is partially different in function from the control unit 6 ′ of the conventional spring return type motor operated valve 100 ′ shown in FIG. It has a communication function with the remote monitoring device 300 connected via the network.

  In this embodiment, the normal opening control range of the valve body (flow rate regulating mechanism) 7 of the spring return type motor operated valve 100 is an opening range from fully closed (θ0) to fully open (θ100). A return operation end position θSR is defined outside the opening range. In this example, the fail safe direction is the fully closed direction, and the return operation end point position θSR is set at a position lower than the fully closed position θ0.

  That is, when the electromagnetic clutch 4 is disengaged, the drive shaft 1 is moved in the closing direction by the return force of the return spring 2 and the valve body 7 is forcibly fully closed. Even after the fully closed state, the drive shaft 1 rotates and stops at the return operation end point position θSR defined at a position lower than the fully closed position θ0.

  When the fail-safe direction is the fully open direction, the return operation end position θSR is determined at a position higher than the fully open position θ100.

  FIG. 2 shows an outline of a hardware configuration of the control unit 6 in the spring return type electric valve 100. In the figure, 6-1 is a CPU, 6-2 is a RAM, 6-3 is a ROM, 6-4 is an AC / DC converter, 6-5 to 6-8 is an interface, and 6-9 is an EEPROM. This is a writable nonvolatile memory. The AC / DC converter 6-4 receives the power supply (AC 24V) to the electromagnetic clutch 4 and the motor 5 as a branch input, converts this power supply into a DC voltage, and converts the CPU 6-1, RAM 6-2, ROM 6-3, and interface. 6-5 to 6-8 and supplied to the non-volatile memory 6-9.

  The CPU 6-1 operates in accordance with a program stored in the ROM 6-3 while accessing the RAM 6-2 and the nonvolatile memory 6-9, sends a forward rotation command and a reverse rotation command to the motor 5, and turns on the electromagnetic clutch 4. Send commands and OFF commands. The ROM 6-3 stores a spring return operation confirmation program as a program unique to the present embodiment.

  In the non-volatile memory 6-9, in Embodiment 1 described later, it is assumed that 0 (NT = 0) is stored as the initial value of the total number of spring return operations NT at the factory shipment stage. In Embodiment 2, it is assumed that 0 (NA = 0) is stored as the initial value of the spring return operation test number NA at the factory shipment stage.

  In the third embodiment to be described later, 0 (NT = 0, NA = 0) is stored as the initial values of the total number of spring return operations NT and the number of spring return operation tests NA at the time of factory shipment. In the fourth embodiment to be described later, as the initial value of the spring return operation number NB when the power supply is cut off without receiving the spring return operation test number NA and the spring return operation confirmation command at the factory shipment stage, Assume that 0 (NA = 0, NB = 0) is stored.

  The total number of spring return operations NT, the number of spring return operation tests NA, and the number of spring return operations NB when the supply of power is interrupted without receiving a spring return operation confirmation command will be described later.

[Normal mode]
In the normal mode in which the spring return operation confirmation command is not received from the remote monitoring device 300, the CPU 6-1 of the control unit 6 sends an ON command to the electromagnetic clutch 4 so that the electromagnetic clutch 4 is in a clutch engaged state. Further, a forward rotation command and a reverse rotation command are sent to the motor 5 so that the current opening degree θpv of the valve body 7 matches the target opening degree θsp. As a result, the output shaft of the motor 5 is always rotationally coupled to the drive shaft 1 via the speed reduction mechanism 3, and the rotational force of the motor 5 is transmitted to the drive shaft 1 via the electromagnetic clutch 4 and the speed reduction mechanism 3. The opening degree control is performed. When the motor 5 stops after receiving a forward rotation command or a reverse rotation command, the drive shaft 1 maintains the current operating position by the holding torque of the motor 5.

[Embodiment 1: Example of counting only the total number of spring return operations NT]
[Confirmation of spring return operation]
When the administrator wants to confirm the spring return operation of the spring return type motor operated valve 100, the administrator sends a spring return operation confirmation command from the remote monitoring device 300 to the spring return type motor operated valve 100 via the network 200. Upon receiving this spring return operation confirmation command, the CPU 6-1 of the control unit 6 sends an OFF command to the electromagnetic clutch 4. Thereby, the power supply to the electromagnetic clutch 4 is cut off, the electromagnetic clutch 4 is cut off, and the torque of the motor 5 is not transmitted to the drive shaft 1.

  In this case, if the spring return function works normally, the drive shaft 1 operates in the closing direction by the return force of the return spring 2, and the valve body 7 is forcibly closed. At this time, the operation position of the drive shaft 1 is returned to the return operation end position θSR which is set at a position lower than the fully closed position θ0. Thereby, the opening value θpv sent from the opening sensor 8 to the control unit 6 becomes θSR, and it is confirmed in the CPU 6-1 that the operating position of the drive shaft 1 has been returned to the return operation end position θSR.

  When the CPU 6-1 confirms that the operation position of the drive shaft 1 has been returned to the return operation end position θSR (YES in step 101 shown in FIG. 3), the total number of spring return operations NT from the nonvolatile memory 6-9. 1 is added to the total number of spring return operations NT (step 102), that is, the total number of spring return operations NT is incremented by 1, and the total number of spring return operations NT counted up is stored in the nonvolatile memory 6-. 9 is updated and held (step 103).

  Then, the spring return operation total number NT updated and held in the non-volatile memory 6-9 is compared with a predetermined upper limit value NTmax of the spring return operation number (step 104), and the total spring return operation number NT is the upper limit value. If it is within NTmax (NO in step 104), the total number of spring return operations NT at that time and the ratio of the total number of spring return operations NT to the upper limit NTmax ((NT / NTmax) × 100 (%)) The remote monitoring device 300 is notified via the network 200 via 6-8 (step 105).

  If the total number of spring return movements NT exceeds the upper limit value NTmax (YES in step 104), the CPU 6-1 combines with the determination result that the total number of spring return movements NT exceeds the upper limit value NTmax. The total number of spring return operations NT and the ratio of the total number of spring return operations NT to the upper limit value NTmax ((NT / NTmax) × 100 (%)) are remotely transmitted via the network 200 via the interface 6-8. The monitoring device 300 is notified (step 106).

[When power is cut off]
When the supply of power to the spring return type motor operated valve 100 is interrupted due to a power failure or the like, the power to the electromagnetic clutch 4 is also cut off. For this reason, the electromagnetic clutch 4 is disconnected, the torque of the motor 5 is not transmitted to the drive shaft 1, the drive shaft 1 operates in the closing direction by the return force of the return spring 2, and the valve body 7 is forcibly closed. Is done. At this time, the operation position of the drive shaft 1 is returned to the return operation end position θSR which is set at a position lower than the fully closed position θ0. On the other hand, since the memory 6-2 is a non-volatile memory, it holds the total number of spring operations NT before the power is shut off.

  In this case, after the interruption of the power supply is restored, the CPU 6-1 confirms that the operation position of the drive shaft 1 is returned to the return operation end position θSR (YES in Step 101), and the nonvolatile memory 6- The total number of spring return operations NT is read from 9, and 1 is added to the total number of spring return operations NT (step 102), that is, the total number of spring return operations NT is incremented by 1, and the total number of spring return operations counted up is counted. NT is updated and held in the nonvolatile memory 6-9 (step 103).

  Then, the spring return operation total number NT updated and held in the nonvolatile memory 6-9 is compared with the upper limit value NTmax of the spring return operation number (step 104), and if the spring return operation total number NT is within the upper limit value NTmax. (NO in step 104), the total number of spring return operations NT at that time and the ratio of the total number of spring return operations NT to the upper limit NTmax ((NT / NTmax) × 100 (%)) Via the network 200 to the remote monitoring device 300 (step 105).

  If the total number of spring return movements NT exceeds the upper limit value NTmax (YES in step 104), the CPU 6-1 combines with the determination result that the total number of spring return movements NT exceeds the upper limit value NTmax. The total number of spring return operations NT and the ratio of the total number of spring return operations NT to the upper limit value NTmax ((NT / NTmax) × 100 (%)) are remotely transmitted via the network 200 via the interface 6-8. The monitoring device 300 is notified (step 106).

  As can be seen from the above description, in the first embodiment, the number of spring return operations is determined based on the number of spring return operations NA when the spring return operation confirmation command is received and the supply of power without receiving the spring return operation confirmation command. The total value of the total number of spring return operations NB when interrupted is counted, and this is updated and held in the nonvolatile memory 6-9 as the total number of spring return operations NT.

  In this case, the total number of spring return operations NT is counted as the number of times that the operation position of the drive shaft 1 has reached the return operation end point position θSR determined at a position lower than the fully closed position θ0 of the valve body 7. The number of spring return operations can be accurately counted separately from the fully closed position θ0 for normal opening control, and the return spring 2 replacement time can be counted from the counted number of spring operations without relying on the operator's visual confirmation. Can know automatically.

  In the first embodiment, a spring return operation confirmation command is sent from the remote monitoring device 300 to the spring return type motor operated valve 100 via the network 200, but the confirmation attached to the spring return type motor operated valve 100 is confirmed. The spring return operation may be confirmed by pressing a button (not shown) or intentionally cutting off the power supply to the spring return type motor operated valve 100. The CPU 6-1 counts the total number of spring return operations NT including the number of spring return operations in such a case.

[Embodiment 2: Example of Counting Only Spring Return Operation Test Number NA]
[Confirmation of spring return operation]
When the administrator wants to confirm the spring return operation of the spring return type electric valve 100, the administrator sends a spring return operation confirmation command from the remote monitoring device 300 to the spring return type electric valve 100 via the network 200. Upon receiving this spring return operation confirmation command, the CPU 6-1 of the control unit 6 sends an OFF command to the electromagnetic clutch 4. Thereby, the power supply to the electromagnetic clutch 4 is cut off, the electromagnetic clutch 4 is cut off, and the torque of the motor 5 is not transmitted to the drive shaft 1.

  In this case, if the spring return function works normally, the drive shaft 1 is moved in the closing direction by the return force of the return spring 2, the valve body 7 is forcibly closed, and the operating position of the drive shaft 1 is the return operation. Returned to the end point position θSR. Thereby, the opening degree value θpv sent from the opening degree sensor 8 to the control unit 6 becomes θSR, and the CPU 6-1 confirms that the operating position of the drive shaft 1 has been returned to the return operation end position θSR.

  After receiving the spring return operation confirmation command from the remote monitoring device 300 (YES in step 201 shown in FIG. 4), the CPU 6-1 confirms that the operation position of the drive shaft 1 has been returned to the return operation end position θSR. Then (YES in step 202), the spring return operation test number NA is read from the nonvolatile memory 6-9, and 1 is added to the spring return operation test number NA (step 203), that is, the spring return operation test number NA is set. The counted number of the spring return operation test NA is incremented by one and updated and held in the nonvolatile memory 6-9 (step 204).

  Then, the spring return operation test number NT updated and held in the nonvolatile memory 6-9 is compared with a predetermined upper limit value NAmax of the spring return operation test number (step 205). If it is within the upper limit NAmax (NO in step 205), the spring return operation test number NA at that time and the ratio of the spring return operation test number NA to the upper limit value NAmax ((NA / NAmax) × 100 (%)) The remote monitoring device 300 is notified via the interface 6-8 and the network 200 (step 206).

  If the spring return operation test number NA exceeds the upper limit value NAmax (YES in step 205), the CPU 6-1 combines with the determination result that the spring return operation test number NA has exceeded the upper limit value NAmax. The spring return operation test count NA and the ratio of the spring return operation test count NA to the upper limit NAmax ((NA / NAmax) × 100 (%)) are remotely transmitted via the network 6 through the interface 6-8. The monitoring device 300 is notified (step 207).

  As can be seen from the above description, in the second embodiment, the number of spring return operations is counted only when the spring return operation confirmation command is received, and this is non-volatile as the spring return operation test number NA. The memory 6-9 is updated and held. In this case, the number of spring return operations is not counted when the supply of power to the spring return type motor operated valve 100 is interrupted without receiving a spring return operation confirmation command. You can know when to replace.

  Also in the second embodiment, a confirmation button (not shown) attached to the spring return type motor operated valve 100 may be pressed.

[Embodiment 3: Example of Counting Spring Return Operation Total Number NT and Spring Return Operation Test Number NA]
In the first embodiment, only the total number of spring return operations NT is counted, and in the second embodiment, only the number of spring return operation tests NA is counted, but the total number of spring return operations NT and the spring return operation are counted. Both of the test times NA may be counted. In this case, by subtracting the spring return operation test number NA from the total number of spring return operations NT, the spring return operation number NB when the supply of power is interrupted without receiving the spring return operation confirmation command can be obtained.

  FIG. 5 shows a flowchart in this case. According to this flowchart, the total number of spring return operations NT is counted by the processing of steps 301 to 303, and is updated and held in the nonvolatile memory 6-9. Further, the spring return operation test number NA is counted by the processing of steps 304 to 306 and updated and held in the nonvolatile memory 6-9. Then, the total number of spring return operations NT updated and held in the nonvolatile memory 6-9 is compared with the upper limit value NTmax of the number of spring return operations (step 307).

  If the total number of spring return operations NT is within the upper limit NTmax (NO in step 307), the total number of spring return operations NT, the number of spring return operation tests NA, the total number of spring return operations NT, and the spring The number of spring return operations NB when the power supply is cut off without receiving the spring return operation confirmation command calculated as the difference from the number of return operation tests NA, and the ratio of the total number of spring return operations NT to the upper limit NTmax The ratio of the spring return operation test number NT to the upper limit value NTmax and the ratio of the spring return operation number NB when the supply of power is interrupted without receiving a spring return operation confirmation command for the upper limit value NTmax are 8 through Via Ttowaku 200 it is notified to the remote monitoring device 300 (step 308).

  If the total number of spring return operations NT exceeds the upper limit value NTmax (YES in step 307), together with the determination result that the total number of spring return operations NT exceeds the upper limit value NTmax, the total number of spring return operations at that time Spring when power supply is cut off without receiving a spring return operation confirmation command calculated as the difference between NT, spring return operation test number NA, and spring return operation total number NT and spring return operation test number NA Supply of power without receiving the return operation number NB, the ratio of the total number of spring return operations NT to the upper limit value NTmax, the ratio of the spring return operation test number NT to the upper limit value NTmax, and the spring return operation confirmation command for the upper limit value NTmax Is cut off The ratio of the spring return operation number NB of if is, through the interface 6-8 via the network 200 is notified to the remote monitoring device 300 (step 309).

[Embodiment 4: Example of counting the number of spring return operations NB when the supply of power is cut off without receiving the spring return operation test number NA and the spring return operation confirmation command]
In the third embodiment, the total number of spring return operations NT and the number of spring return operation tests NA are counted, and the spring return operation test number NA is subtracted from the total number of spring return operations NT, so that no spring return operation confirmation command is received. The number of spring return operations NB when the power supply is cut off is calculated, but the number of spring return operations when the power supply is cut off without receiving the spring return operation test number NA and the spring return operation confirmation command. NB is counted, and the total number of spring return operations NT is obtained by adding the number of spring return operation tests NA and the number of spring return operations NB when power supply is cut off without receiving a spring return operation confirmation command. Like It may be.

  FIG. 6 shows a flowchart in this case. According to this flowchart, the spring return operation test number NA is counted by the processing of steps 401 to 404 and is updated and held in the nonvolatile memory 6-9. In addition, the number of spring return operations NB when the supply of power is interrupted by the processing of steps 401 and 405 to 407 is counted and updated and held in the nonvolatile memory 6-9.

  The spring return operation test number NA updated and held in the non-volatile memory 6-9 and the spring return operation number NB when the supply of power is cut off without receiving the spring return operation confirmation command are added to the spring. The total number of return operations NT is determined (step 408), and the determined total number of spring return operations NT is compared with the upper limit NTmax of the number of spring return operations (step 409).

  If the total number of spring return operations NT is within the upper limit NTmax (NO in step 409), the total number of spring return operations NT, the number of spring return operation tests NA, and the spring return operation confirmation command are not received. The number of spring return operations NB when the power supply is cut off, the ratio of the total number of spring return operations NT to the upper limit value NTmax ((NT / NTmax) × 100 (%)), and the spring return operation with respect to the upper limit value NTmax The ratio of the number of tests NT ((NA / NTmax) × 100 (%)) and the ratio of the number of spring return operations NB when the power supply is cut off without receiving the spring return operation confirmation command for the upper limit value NTmax (( NB / NTmax) x 100 (%)) Via Esu 6-8 via the network 200 is notified to the remote monitoring device 300 (step 410).

  If the total number of spring return operations NT exceeds the upper limit value NTmax (YES in step 409), together with the determination result that the total number of spring return operations NT exceeds the upper limit value NTmax, the total number of spring return operations at that time NT, the spring return operation test number NA, the spring return operation number NB when the power supply is cut off without receiving the spring return operation confirmation command, and the ratio of the total number of spring return operations NT to the upper limit value NTmax, The ratio of the spring return operation test number NT to the upper limit value NTmax and the ratio of the spring return operation number NB when the supply of power is interrupted without receiving a spring return operation confirmation command for the upper limit value NTmax are the interface 6-8. Through the network 200 via, is notified to the remote monitoring device 300 (step 411).

  In the first embodiment described above, the ratio of the total number of spring return operations NT to the upper limit value NTmax is notified to the remote monitoring device 300 as the related information of the total number of spring return operations NT. The remaining number of times until reaching the maximum value NTmax may be notified and used for maintenance decision making. The same applies to the second to fourth embodiments.

  Further, as a method different from the third and fourth embodiments, the total number of spring return operations NT and the number of spring return operations NB when the supply of power is interrupted without receiving a spring return operation confirmation command are counted. The spring return operation test number NA may be obtained by subtracting the spring return operation number NB when the power supply is cut off without receiving the spring return operation confirmation command from the total return operation number NT.

  In the first to fourth embodiments described above, the spring return type motor operated valve 100 is connected to the remote monitoring device 300 via the network 200. However, the spring return type motor valve 100 alone is used to confirm the spring return operation. It is good also as composition which performs. In this case, the spring return type motor operated valve 100 includes the total number of spring return operations NT, the number of spring return operation tests NA, the number of spring return operations NB when power supply is cut off without receiving a spring return operation confirmation command, A display unit for notifying information related to NT, NA, and NB may be provided.

  Moreover, in Embodiment 1-4 mentioned above, based on the information from the opening degree sensor 8 which detects the operating position of the drive shaft 1 as the present opening degree (theta) pv of the valve body 7, the operating position of the drive shaft 1 returns operation | movement. Although it has been detected that it has returned to the end point position θSR, a sensor (for example, a limit switch) that detects that the operating position of the drive shaft 1 has returned to the return operation end point position θSR separately from the opening degree sensor 8. And information from this sensor may be provided to the CPU 6-1.

It is a figure showing the outline of the spring return operation check system containing one embodiment of the spring return type electric valve concerning the present invention. It is a figure which shows the outline of the hardware constitutions of the control part of the spring return type motor operated valve in this spring return operation confirmation system. 7 is a flowchart (Embodiment 1) showing a count process of the number of times of a spring return operation in a control unit when a spring return operation is performed in this spring return type electric valve. 7 is a flowchart (second embodiment) for explaining the count processing operation of the number of times of spring return operation in the control unit when the spring return operation is performed in this spring return type motor operated valve. FIG. 10 is a flowchart (Embodiment 3) for explaining the count processing operation of the number of spring return operations in the control unit when a spring return operation is performed in this spring return type motor operated valve. FIG. 10 is a flowchart (Embodiment 4) for explaining the count processing operation of the number of spring return operations in the control unit when a spring return operation is performed in this spring return type motor operated valve. It is a figure which shows an example of the conventional spring return type motor operated valve.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Drive shaft, 2 ... Return spring, 3 ... Deceleration mechanism, 4 ... Electromagnetic clutch, 5 ... Motor, 6 ... Control part, 6-1 ... CPU, 6-2 ... RAM, 6-3 ... ROM, 6-4 ... AC / DC converter, 6-5 to 6-8 ... interface, 6-9 ... nonvolatile memory, 7 ... valve, 8 ... opening sensor, 100 ... spring return type motor operated valve, 200 ... network, 300 ... remote monitoring device.

Claims (5)

A motor that rotates in response to power supply, a drive shaft connected to the output shaft of the motor via an electromagnetic clutch and a speed reduction mechanism, and a flow rate regulating mechanism that regulates the flow rate of fluid according to the operating position of the drive shaft A control unit that gives a command to the motor to control the opening degree of the flow rate regulating mechanism, and the operation position of the drive shaft when the electromagnetic clutch is disengaged, the normal opening degree control of the flow rate regulating mechanism A spring return type electric flow control device comprising a return spring that returns to a predetermined return operation end position determined outside the range,
Return operation end position detecting means for detecting arrival of the operation position of the drive shaft at the return operation end position;
Counting means for counting the number of times the operating position of the drive shaft reaches the return operation end position as the number of spring return operations;
And a non-volatile memory that updates and holds the number of times of the spring return operation counted by the counting means. A motor that rotates in response to power supply, a drive shaft connected to the output shaft of the motor via an electromagnetic clutch and a speed reduction mechanism, and a flow rate regulating mechanism that regulates the flow rate of fluid according to the operating position of the drive shaft A control unit that gives a command to the motor to control the opening degree of the flow rate regulating mechanism, and the operation position of the drive shaft when the electromagnetic clutch is disengaged, the normal opening degree control of the flow rate regulating mechanism A spring return type electric flow control device comprising a return spring that returns to a predetermined return operation end position determined outside the range,
Clutch disengagement means for disengaging the electromagnetic clutch in response to an operation confirmation command for the return spring;
Return operation end position detecting means for detecting arrival of the operation position of the drive shaft at the return operation end position;
Counting means for counting the number of times the operating position of the drive shaft reaches the return operation end position after receiving an operation confirmation command for the return spring as the number of times of spring return operation;
And a non-volatile memory that updates and holds the number of times of the spring return operation counted by the counting means. A motor that rotates in response to power supply, a drive shaft connected to the output shaft of the motor via an electromagnetic clutch and a speed reduction mechanism, and a flow rate regulating mechanism that regulates the flow rate of fluid according to the operating position of the drive shaft A control unit that gives a command to the motor to control the opening degree of the flow rate regulating mechanism, and the operation position of the drive shaft when the electromagnetic clutch is disengaged, the normal opening degree control of the flow rate regulating mechanism A spring return type electric flow control device comprising a return spring that returns to a predetermined return operation end position determined outside the range,
Clutch disengagement means for disengaging the electromagnetic clutch in response to an operation confirmation command for the return spring;
Return operation end position detecting means for detecting arrival of the operation position of the drive shaft at the return operation end position;
First counting means for counting the number of times the operating position of the drive shaft reaches the return operation end position as the total number of spring return operations;
Second counting means for counting the number of times the operating position of the drive shaft reaches the return operation end position after receiving an operation confirmation command for the return spring as the number of spring return operation tests;
A spring return type comprising: a non-volatile memory that updates and holds the total number of spring return operations counted by the first count means and the number of spring return operation tests counted by the second count means. Electric flow control device. In the spring return type electric flow control device according to claim 1 or 2,
A spring return type electric flow rate adjusting device comprising: notification means for notifying the number of spring return operations held in the memory and related information thereof. In the spring return type electric flow control device according to claim 3,
A spring return type electric flow rate adjusting device comprising: notification means for notifying the total number of spring return operations and the number of spring return operation tests held in the memory and related information thereof.

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