This Application is a 371 of PCT/JP2018/002925 filed on Jan. 30, 2018 which, in turn, claimed the priority of Japanese Patent Application No. 2017-029192 filed on Feb. 20, 2017, both applications are incorporated herein by reference.
The present invention relates to an electrically operated valve, and more particularly, to an electrically operated valve capable of detecting the position of a valve body.
The use of angle sensors to detect the valve opening degree of electrically operated valves is known.
As an example of a related technique, Patent Document 1 discloses a valve opening degree detection device for an electrically operated valve. The valve opening degree detection device described in Patent Document 1 includes a magnetic drum in which north and south poles fixed to a rotation axis are equally divided on the circumference, a rotation angle detection magnetic sensor provided on the circumference of the outer side of a can opposite to the north-south pole, a magnet provided on the end of the rotation axis, a vertical position detection magnetic sensor provided on the outer side of the can opposite to the magnet, and a valve opening degree calculation means for calculating a valve opening degree based on the detected values of the rotation angle detection magnetic sensor and the vertical position detection magnetic sensor.
Also, Patent Document 2 discloses an electrically operated valve that utilizes a stepping motor. The electrically operated valve disclosed in Patent Document 2 includes a stator, a rotor rotationally driven by the stator, a detection rotor for detecting a rotational position of the rotor, and a Hall IC disposed outside the detection rotor. In the electrically operated valve described in Patent Document 2, the rotational position of the rotor is detected based on an output signal detected by a Hall IC disposed on an outer side of the detection rotor.
[Patent Document 1] Japanese Patent Application Publication No. 2001-12633
[Patent Document 2] Japanese Patent Application Publication No. 2014-161152
In the electrically operated valve described in Patent Documents 1 and 2, the rotation angle of a rotating body such as a rotor is detected by a magnetic sensor disposed in the radially outer direction of the rotating body. However, when the rotation angle of the rotating body is detected by a magnetic sensor disposed in the radially outer direction of the rotating body, it is difficult to accurately detect the rotation angle of the rotating body unless a large number of magnetic sensors are disposed in the radially outer direction of the rotating body. Disposing a large number of magnetic sensors, however, increases the cost. In addition, it becomes necessary to secure sufficient space for disposing a large number of magnetic sensors, and there is a risk that the support mechanism for supporting the large number of magnetic sensors may become complicated. In addition when the magnetic sensor detects the rotation angle by increasing or decreasing the Hall current, the rotation angle information is lost when the power is turned off, and when the power is turned on again, the absolute rotation angle of the rotating body may not be known.
It is therefore an object of the present invention to provide an electrically operated valve capable of more accurately detecting the position of the valve body by more accurately detecting the rotation angle of a rotation shaft.
In order to achieve the above object, the electrically operated valve according to the present invention includes a valve body, a driver configured to move the valve body along a first axis, a rotation shaft configured to rotate the driver around the first axis, a permanent magnet member disposed on the rotation shaft and configured to rotate with the rotation shaft, and an angle sensor configured to detect a rotation angle of a permanent magnet included in the permanent magnet member. The angle sensor is disposed above the permanent magnet.
In the electrically operated valve according to some embodiments, the angle sensor may be supported by a control substrate configured to control the rotational movement of the rotation shaft.
In the electrically operated valve according to some embodiments, a case for accommodating the permanent magnet member may be included. An end wall of the case may be disposed between the angle sensor and the permanent magnet member.
In the electrically operated valve according to some embodiments, a permanent magnet positioning member configured to maintain a constant distance between the permanent magnet and the angle sensor may be disposed inside the case.
In the electrically operated valve according to some embodiments, a partition member configured to divide a space within the case into an upper space and a lower space may be further included. The permanent magnet member may be disposed in the upper space. It should be noted that the partition member may be formed of a soft magnetic material.
In the electrically operated valve according to some embodiments, the driver and the rotation shaft may be separate bodies. The driver and the rotation shaft may be movable relative to each other along the first axis.
In the electrically operated valve according to some embodiments, the rotation shaft may be movable relative to the permanent magnet member in a direction along the first axis. The permanent magnet member may include a second engagement portion configured to engage with a first engagement portion of the rotation shaft such that the permanent magnet rotates with the rotation shaft.
In the electrically operated valve according to some embodiments, the angle sensor may include a plurality of magnetic detection elements configured to detect a component of a magnetic flux in a direction along the first axis.
In the electrically operated valve according to some embodiments, a stator member that includes a coil, a rotor member coupled to the rotation shaft so as to enable power transmission, and a computing device configured to determine the presence or absence of an operation normality of the electrically operated valve may be further included. The computing device may determine the presence or absence of an operation abnormality of the electrically operated valve based on the rotation angle measured by the angle sensor and a number of input pulses to the coil.
According to the present invention, it is possible to provide an electrically operated valve capable of more accurately detecting the position of a valve body.
Hereinafter, an electrically operated valve according to embodiments will be described with reference to the drawings. It should be noted that in the following description of the embodiments, parts and members having the same functions are denoted by the same reference numerals, and repetitive descriptions of parts and members denoted by the same reference numerals are omitted.
Referring to
The electrically operated valve A includes a valve body 10, a driver 30, a rotation shaft 50, a power source 60 for transmitting power to the rotation shaft 50, a permanent magnet member 70 that includes a permanent magnet 72, and an angle sensor 80 for detecting a rotation angle of the permanent magnet 72.
The valve body 10 closes the flow path by contacting the valve seat 20, and opens the flow path by separating from the valve seat 20.
The driver 30 is a member for moving the valve body 10 along the first axis Z. In the example illustrated in
The rotation shaft 50 is a member for rotating the driver 30 about the first axis Z. The rotation shaft 50 receives power from a power source 60 and rotates about the first axis Z. The rotation shaft 50 and the driver 30 are mechanically connected to each other. Accordingly, when the rotation shaft 50 rotates about the first axis Z, the driver 30 also rotates about the first axis Z. The rotation shaft 50 and the driver 30 may be integrally formed or may be separately formed.
In the example illustrated in
The permanent magnet member 70 rotates about the first axis Z together with the rotation shaft 50. The permanent magnet member 70 includes a permanent magnet 72, and the permanent magnet 72 includes a north pole and a south pole in a cross section perpendicular to the first axis Z. The permanent magnet member 70 may be fixed to the rotation shaft 50. Alternatively, as illustrated in the third embodiment to be described later, the permanent magnet member 70 may be non-rotatable relative to the rotation shaft 50 and may be movable relative to the rotation shaft 50 in the first axis Z direction.
The angle sensor 80 detects the rotation angle of the permanent magnet 72 included in the permanent magnet member 70. The angle sensor 80 is disposed above the permanent magnet 72. Since the angle sensor 80 is a sensor for detecting the rotation angle of the permanent magnet 72, it is arranged separately from the rotating body that includes the permanent magnet 72. The angle sensor 80 includes a magnetic detection element 82 for detecting a magnetic flux density or the like. As the permanent magnet 72 rotates about the first axis Z, the magnetic flux passing through the magnetic detection element 82 changes. In this way, the magnetic detection element 82 (the angle sensor 80) detects the rotation angle of the permanent magnet 72 about the first axis Z.
As the permanent magnet 72 rotates about the first axis Z, the angle of the magnetic flux passing through the magnetic detection element 82 located above the permanent magnet continuously changes. As a result, the magnetic detection element 82 (angle sensor 80) can continuously detect the rotation angle of the permanent magnet 72 about the first axis Z. In the example illustrated in
In the present specification, the end of the rotation shaft 50 on the valve body 10 side is referred to as a second end, and the end of the rotation shaft 50 on the opposite side to the valve body is referred to as a first end. Also, in the present specification, “upward” is defined as the direction extending from the second end toward the first end. Accordingly, in reality, even in a case in which the second end portion were to be further downward from the first end portion, the direction extending from the second end portion toward the first end portion is referred to as “upward” in this specification. It should be noted that, in the present specification, the direction opposite to the upward direction, that is, the direction extending from the first end to the second end is referred to as “downward.” Further, the angle sensor 80 is not limited to an arrangement in which the center coincides with the rotation axis of the rotation shaft 50, and the mounting position may be changed in accordance with the measurement sensitivity.
Next, an optional additional configuration example that can be employed in the first embodiment will be described. In Configuration Example 1, the valve body 10, the rotation shaft 50, the permanent magnet 72, and the angle sensor 80 are arranged in a straight line. By arranging the valve body 10, the rotation shaft 50, the permanent magnet 72, and the angle sensor 80 in a straight line, it is possible to make the entire electrically operated valve A, including the drive mechanism of the valve body and the rotation angle detection mechanism of the permanent magnet (put differently, the position detection mechanism of the valve body), compact.
In Configuration Example 2, the angle sensor 80 is supported by a control substrate 90 that controls the rotational operation of the rotation shaft 50. Accordingly, it is unnecessary to separately prepare a support member for supporting the angle sensor 80. As a result, the structure of the electrically operated valve A can be simplified, and the size of the electrically operated valve A can be reduced. It should be noted that the control substrate 90 transmits a control signal to the power source 60 to control the operation of the power source.
In Configuration Example 3, the electrically operated valve A includes a case (for example, a metal can 100) for accommodating the permanent magnet 72. The end wall 102 of the case is disposed between the angle sensor 80 and the permanent magnet member 70. In other words, the angle sensor 80 and the permanent magnet member 70 are disposed to face each other with the end wall 102 of the case interposed therebetween. It should be noted that the case is not a rotating body that rotates about the first axis Z. Accordingly, when the electrically operated valve A operates, the permanent magnet 72 rotates relative to the case, which is in a stationary state. When a rotating body such as the permanent magnet 72 rotates within the case, there is a possibility that the vibration of the rotating body is transmitted to the case. In the example illustrated in
In the example illustrated in
It should be noted that in the first embodiment, it is possible for Configuration Examples 1 to 3 to be employed in combination. For example, in the first embodiment, Configuration Example 1 and Configuration Example 2, Configuration Example 2 and Configuration Example 3, or Configuration Examples 1 to 3 may be employed. In addition, Configuration Examples 1 to 3 may be employed in the embodiments to be described later (the second embodiment and the third embodiment).
Referring to
The electrically operated valve B includes a valve body 10, a valve seat 20, a driver 30, a rotation shaft 50, a power source 60 for transmitting power to the rotation shaft 50, a permanent magnet member 70 that includes a permanent magnet 72, and an angle sensor 80 for detecting a rotation angle of the permanent magnet 72.
The electrically operated valve B includes a first flow path 112 and a second flow path 114. When the valve body 10 and the valve seat 20 are separated from each other, that is, when the valve body 10 is in the upward position, the fluid flows into the valve chamber 113 via the first flow path 112, and the fluid in the valve chamber 113 is discharged via the second flow path 114. In contrast, when the valve body 10 and the valve seat 20 are in contact with each other, that is, when the valve body 10 is in the downward position, the first flow path 112 and the second flow path 114 are in a state of non-communication with each other.
It should be noted that in the example illustrated in
In the example illustrated in
The power transmission mechanism 120 is a member for connecting the rotor member 64 and the rotation shaft 50 so as to enable power transmission. The power transmission mechanism 120 includes a plurality of gears. The power transmission mechanism 120 may include a planetary gear mechanism. Details of the planetary gear mechanism will be described later.
In the example illustrated in
In the example illustrated in
The control substrate 90 (more specifically, a circuit on the control substrate) controls the number of pulses supplied to the coil 620. When a predetermined number of pulses is supplied to the coil 620, the rotor member 64 rotates by a rotation angle corresponding to the number of pulses. The rotor member 64 and the rotation shaft 50 are connected via a power transmission mechanism 120 so as to enable power transmission.
Accordingly, when the rotor member 64 rotates, the rotation shaft 50 rotates by a rotation angle proportional to the rotation angle of the rotor member 64.
The rotation shaft 50 rotates the driver 30. In the example illustrated in
The permanent magnet member 70 is disposed at the first end 54 of the rotation shaft 50. In the example illustrated in
That is, in the second embodiment, since the rotation shaft 50 and the driver 30 are separate bodies, and the rotation shaft 50 and the driver 30 are movable relative to each other along the first axis Z, it is possible to maintain a constant distance between the permanent magnet member 70 disposed on the rotation shaft 50 and the angle sensor 80. As a result, the accuracy of the detection of the rotation angle of the permanent magnet 72 by the angle sensor 80 is improved. In cases where the rotation shaft 50 and the permanent magnet 72 move up and down along with the vertical movement of the driver 30, there is a risk that the detection accuracy of the rotation angle of the permanent magnet 72 by the angle sensor 80 may be lowered. In contrast, the second embodiment is innovative in that the rotation shaft 50 and the permanent magnet 72 are prevented from moving up and down even when the driver 30 moves vertically.
In the example illustrated in
In the example illustrated in
The material of the partition member 130 will be described. The partition member 130 of the present embodiment is made of, for example, a resin (e.g., polyphenylene sulfide (PPS)). Alternatively, the partition member 130 may be formed of a soft magnetic material. Examples of the soft magnetic material include iron, silicon steel, a resin having magnetism, and the like. The member for partitioning the inside of the can into the upper space and the lower space is made of a soft magnetic material, whereby interference between the magnetism of the permanent magnet member 70 and other magnetism, for example, the magnetism of the rotor member 64, can be prevented. In particular, the permanent magnet member 70 is magnetized at two poles in the circumferential direction, and the rotor member 64 is magnetized in such a manner that magnetic poles of four or more poles (for example, eight poles) alternate in the circumferential direction. Therefore, by preventing the interference between the magnetism of the permanent magnet member 70 and the magnetism of the rotor member 64, the deviation of the angle measured by the angle sensor 80 and the slight torque variation of the rotation of the rotor member 64 can be prevented. It is needless to say that the partition member 130 of the third embodiment described later may also be formed of a soft magnetic material.
(Power Transmission Mechanism)
An example of a mechanism for transmitting power from the power source 60 to the valve body 10 will be described in detail with reference to
In the example illustrated in
In the example illustrated in
The sun gear member 121 includes a coupling portion 1211 coupled to the rotor member 64 and a sun gear 1212. The coupling portion 1211 extends along a radial direction (that is, a direction perpendicular to the first axis Z), and the sun gear 1212 extends along the first axis Z. In the axial hole of the sun gear 1212, the rotation shaft 50 is disposed so as to be freely rotatable relative to the inner wall of the sun gear.
The external teeth of the sun gear 1212 mesh with the plurality of planetary gears 122. Each planetary gear 122 is rotatably supported by a shaft 124 that is supported by a carrier 123. The outer teeth of each planetary gear 122 mesh with an annular ring gear 125 (internal tooth fixed gear).
The ring gear 125 is a member that cannot rotate relative to the can 100. In the example illustrated in
In addition, the planetary gear 122 also meshes with an annular second ring gear 127 (an internal tooth movable gear). In the example illustrated in
The above-described gear configuration (the sun gear, planetary gear, internal tooth fixed gear, and internal tooth movable gear) constitutes a so-called eccentric planetary gear mechanism. In a reduction gear using an eccentric planetary gear mechanism, by setting the number of teeth of the second ring gear 127 to be slightly different from the number of teeth of the ring gear 125, the rotational speed of the sun gear 1212 can be reduced at a large reduction gear ratio and transmitted to the second ring gear 127.
It should be noted that in the example illustrated in
As illustrated in
An external thread 31 is provided on the outer peripheral surface of the driver 30. The external thread 31 is screwed to an internal thread 41 provided on a guide member 40 for guiding the driver. Accordingly, when the rotation shaft 50 and the driver 30 rotate about the first axis Z, the driver 30 moves up and down while being guided by the guide member 40. In contrast, the rotation shaft 50 is rotatably supported by a shaft receiving member such as the sun gear 1212 or the guide member 40, and cannot move in the first axis Z direction.
It should be noted that in the example illustrated in
The lower end 32 of the driver 30 is rotatably connected to the upper end 12 of the valve body 10 via a ball 160 or the like. In the example illustrated in
The downward movement of the valve body 10 is performed as a result of the valve body 10 being pushed by the driver 30. The upward movement of the valve body 10 is performed by pushing the valve body 10 upward by a spring member 170 such as a coil spring while the driver 30 is moving upward. That is, in the example illustrated in
With the above configuration, it is possible to drive the valve body 10 by using the power from the power source 60. The amount of movement of the valve body 10 in the direction along the first axis Z is proportional to the amount of rotation of the rotation shaft 50 and the permanent magnet 72. Accordingly, in the second embodiment, by measuring the rotation angle of the permanent magnet 72 about the first axis Z by the angle sensor 80, it is possible to accurately determine the position of the valve body 10 in the direction along the first axis Z. It should be noted that the electrically operated valve B may include a computing device that converts the angle data output from the angle sensor 80 into position data of the valve body 10 in the direction along the first axis Z; that is, the opening degree data for the valve.
In the second embodiment, the rotation shaft 50 and the permanent magnet 72 do not move up and down with respect to the angle sensor 80. In other words, the distance between the permanent magnet 72 and the angle sensor 80 is maintained at a constant distance during the operation of the electrically operated valve B. Accordingly, in the second embodiment, it is possible to accurately calculate the rotation angle of the permanent magnet 72 and the position of the valve body 10 along the first axis Z using the angle sensor 80.
It should be noted that, in the example illustrated in
In addition, as described above, the holder 150 may have a function of supporting at least one of the cylindrical support member 126 or the guide member 40.
Further, in the example illustrated in
It should be noted that each configuration of the electrically operated valve B in the second embodiment may be adopted in the electrically operated valve A of the first embodiment illustrated in
Referring to
In the electrically operated valve C of the third embodiment, the configuration of the rotation shaft 50a and the support mechanism of the permanent magnet member 70 are different from the configuration of the rotation shaft and the support mechanism of the permanent magnet member in the first and second embodiments. Accordingly, in the third embodiment, the configuration of the rotation shaft 50a and the support mechanism of the permanent magnet member 70 will be primarily described, and the description of other repeated configurations will be omitted.
In the second embodiment, the rotation shaft 50 is a member that does not move up and down with respect to the can 100, whereas in the third embodiment, the rotation shaft 50a is a member that moves up and down with respect to the can 100 and the permanent magnet member 70. It should be noted that in the third embodiment, as in the second embodiment, the permanent magnet member 70 is a member that does not move up and down with respect to the can 100.
Referring to
As illustrated in
In the example illustrated in
In the example illustrated in
Next, a permanent magnet positioning member 180 that maintains a constant distance between the permanent magnet 72 and the angle sensor 80 will be described with reference to
The ball 184 is disposed between the end wall 102 of the can 100 and the permanent magnet member 70. The ball 184 functions as a bearing for the permanent magnet member 70, and also functions as a positioning member that defines the vertical position of the permanent magnet member 70.
In the example illustrated in
It should be noted that a suitable bearing member different from the ball 184 may be disposed between the end wall 102 of the can 100 and the permanent magnet member 70. In addition, instead of the leaf spring 182, an optional bearing member may be disposed between the partition member 130 and the permanent magnet member 70. Even in this case, the distance between the permanent magnet 72 and the angle sensor 80 is kept constant by the suitable bearing member.
In the examples illustrated in
In the first and second embodiments, an example in which the rotation shaft 50 is fixed to the output gear has been described. In contrast, in the third embodiment, the output gear 129 and the rotation shaft 50a are not fixed to each other. Instead, the output gear 129 and the rotation shaft 50a are engaged with each other about the first axis Z so as not to be capable of rotation relative to each other.
Referring to
As illustrated in
As illustrated in
As illustrated in
In the third embodiment, the output gear 129 is rotated by the power from the power source 60. As the power transmission mechanism from the power source 60 to the output gear 129, a power transmission mechanism such as the planetary gear mechanism described in the second embodiment may be utilized.
When the output gear 129 rotates, the rotation shaft 50a rotates. In the third embodiment, the rotation shaft 50a and the driver 30 are integrally formed as one member, or are integrally fixed to each other. In addition, an external thread 31 is provided on the outer peripheral surface of the driver 30, and the external thread 31 is screwed to an internal thread 41 provided on the guide member 40 for guiding the driver.
Accordingly, when the rotation shaft 50a rotates, the rotation shaft 50a (the rotation shaft 50a including the driver) moves along the first axis Z. The rotation shaft 50a and the valve body 10 are mechanically connected to each other. Accordingly, when the rotation shaft 50a moves along the first axis Z, the valve body 10 also moves along the first axis Z.
With the above configuration, it is possible to drive the valve body 10 by using the power from the power source 60. The amount of movement of the valve body 10 in the direction along the first axis Z is proportional to the amount of rotation of the rotation shaft 50a and the permanent magnet 72. Accordingly, in the third embodiment, by measuring the rotation angle of the permanent magnet 72 about the first axis Z by the angle sensor 80, it is possible to accurately determine the position of the valve body 10 in the direction along the first axis Z. It should be noted that the electrically operated valve C may include a computing device that converts the angle data output from the angle sensor 80 into position data of the valve body 10 in the direction along the first axis Z; that is, opening degree data for the valve.
In the third embodiment, it is not necessary to fix the permanent magnet member 70 to the rotation shaft 50a. In addition, it is not necessary to fix the rotation shaft 50a to the output gear. Accordingly, it is possible to efficiently assemble the electrically operated valve C.
(Example of Angle Sensor)
An example of the angle sensor 80 of each embodiment will be described with reference to
As illustrated in
The angle sensor 80 is disposed above the permanent magnet 72. In the example illustrated in
In the example illustrated in
As illustrated in
As illustrated in
As illustrated in
As can be seen from
In the examples illustrated in
In the examples illustrated in
It should be noted that each of the permanent magnet 72 and the angle sensor 80 described with reference to
(Computing Device for Determining the Presence or Absence of an Abnormality in the Operation of the Electrically Operated Valve)
Referring to
The electrically operated valve includes a computing device 200. The computing device 200 includes, for example, a hardware processor and a storage device 202, and is connected to an output device 220 so as to be capable of information transmission. The electrically operated valve may also be an electrically operated valve system that includes the computing device 200 (or, alternatively, the computing device and the output device 220).
The electrically operated valves B and C (electrically operated valve systems) include a stator member 62 having a coil 620 and a rotor member 64 as described in the second or third embodiment. The rotation angle of the rotor member 64 and the position of the valve body 10 proportional to the rotation angle of the rotor member 64 (that is, the height from the valve seat 20) are proportional to the number of input pulses input to the coil 620. Accordingly, by monitoring the number of input pulses input to the coil 620, it is possible to calculate the position of the valve body 10 (that is, the height from the valve seat 20).
On the other hand, the position of the valve body 10 (that is, the height from the valve seat 20) is also proportional to the rotation angle of the permanent magnet 72. Accordingly, by monitoring the rotation angle of the permanent magnet 72, it is possible to calculate the position of the valve body 10 (that is, the height from the valve seat 20). In principle, the position of the valve body 10 calculated from the number of pulses input to the coil 620 coincides with the position of the valve body 10 calculated from the rotation angle of the permanent magnet 72. Accordingly, when the position of the valve body 10 calculated from the number of input pulses to the coil 620 and the position of the valve body 10 calculated from the rotation angle of the permanent magnet 72 are different from each other, the computing device 200 determines that there is some abnormality in the electrically operated valves B and C. That is, the electrically operated valves B and C (electrically operated valve systems) have a self-diagnostic function for detecting the presence or absence of abnormalities in their own operation.
It should be noted that the position of the valve body 10 and the rotation angle of the rotation shaft 50 are proportional to each other, the position of the valve body 10 and the rotation angle of the permanent magnet 72 are proportional to each other, and the position of the valve body 10 and the rotation angle of the output gear are proportional to each other. Accordingly, in the present specification, calculating the position of the valve body 10 and calculating the rotation angle of the rotation shaft 50 are equivalent, calculating the position of the valve body 10 and calculating the rotation angle of the permanent magnet 72 are equivalent, and calculating the position of the valve body 10 and calculating the rotation angle of the output gear are equivalent.
Referring to
The storage device 202 of the computing device 200 stores a first valve body position calculation program for calculating the position α of the valve body 10 based on the rotation angle data of the permanent magnet. It should be noted that, in the present specification, the position α of the valve body 10 includes a physical quantity proportional to the position of the valve body 10, such as the rotation angle of the rotation shaft 50, the rotation angle of the permanent magnet, or the rotation angle of the output gear, in addition to the position of the valve body 10 itself. The computing device 200 calculates the position α of the valve body 10 from the rotation angle data of the permanent magnet by executing the first valve body position calculation program.
In addition, the storage device 202 of the computing device 200 stores a second valve body position calculation program for calculating the position ß of the valve body 10 based on the data of the input pulse number. It should be noted that, in the present specification, the position ß of the valve body 10 includes a physical quantity proportional to the position of the valve body 10 such as the rotation angle of the rotation shaft 50, the rotation angle of the permanent magnet, or the rotation angle of the output gear, in addition to the position of the valve body 10 itself. The computing device 200 calculates the position ß of the valve body 10 from the data of the number of pulses input to the coil 620 by executing the second valve body position calculation program.
Further, the storage device 202 of the computing device 200 stores a determination program for comparing the position α of the valve body and the position ß of the valve body to determine whether or not there is an operation abnormality of the electrically operated valve (the electrically operated valve system) based on this comparison result. The computing device 200 determines whether or not there is an abnormality in the operation of the electrically operated valve (the electrically operated valve system) by executing the determination program. For example, the computing device 200 executes the determination program to determine whether or not the difference between the position α of the valve body and the position ß of the valve body is equal to or larger than a preset threshold value. Then, by executing the determination program, when the difference between the position α of the valve body and the position ß of the valve body is equal to or larger than a preset threshold value, the computing device 200 may determine that there is an operation abnormality of the electrically operated valve (the electrically operated valve system). When it is determined that there is an abnormality in the operation of the electrically-operated valve (the electrically-operated valve system), the computing device 200 may execute the determination program to transmit a signal to an output device 220 such as a display or a warning device in order to provide notification of the abnormal operation. Alternatively or additionally, when it is determined that there is an abnormality in the operation of the electrically-operated valve (the electrically-operated valve system), the computing device 200 may store the determination result in the storage device 202 by executing the determination program. In this case, the abnormal operation of the electrically operated valve (the electrically-operated valve system) is stored in the storage device 202 as log data.
When the electrically operated valve (the electrically-operated valve system) includes the above-described computing device 200, it is possible to double-check the position of the valve body 10 using both the number of input pulses to the coil 620 and the rotation angle of the permanent magnet measured by the angle sensor. As a result, the reliability of the electrically operated valve (the electrically operated valve system) is dramatically improved.
It should be noted that instead of using the programs such as the first valve body position calculation program, the second valve body position calculation program, and the determination program in the above-described computing device 200, the first valve body position calculation, the second valve body position calculation, and the determination of the presence or absence of the abnormality in the operation of the electrically operated valve (the electrically operated valve system) may be performed by an electronic circuit in a hardware manner. The electronic circuit or the hardware processor of the computing device 200 may be mounted on the control substrate 90.
The configuration of the computing device 200 and the like described with reference to
The present invention is not limited to the above-described embodiments. Within the scope of the present invention, it is possible to freely combine the above-described embodiments, to modify any component of each embodiment, or to omit any component in each embodiment.
Number | Date | Country | Kind |
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JP2017-029192 | Feb 2017 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2018/002925 | 1/30/2018 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2018/150863 | 8/23/2018 | WO | A |
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