JP2009275845A - Gas cutoff valve unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas cutoff valve unit capable of preventing use while a valve element is in an incompletely opened partially opened state, and capable of notifying occurrence of the partially opened state to a user. <P>SOLUTION: The gas cutoff valve unit 100 is equipped with a channel, the valve element 4 opening and closing the channel, and a motor 5 turning the valve element 4. If it is detected that the valve element 4 is not in a fully closed position after driving the motor 5 so as to turn the valve element 4 from a fully opened position to the fully closed position, the motor 5 is driven so as to turn the valve element 4 to the fully closed position and it is notified that there is failure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gas cutoff valve, and more particularly to a gas cutoff valve that shuts off the supply of gas when an abnormality such as gas leakage occurs.

  Conventionally, a solenoid valve that opens and closes a valve element attached to a movable iron piece by moving the movable iron piece (plunger) using an electromagnet has been used as a gas cutoff valve. Since this solenoid valve performs opening and closing operations by positioning the valve body in the fully open position or the fully closed position with an electromagnet, the gas shut-off valve is always in either the fully open state or the fully closed state, and the valve body is fully open. There is no half-open state of the gas shut-off valve located between the position and the fully closed position (ie halfway position), and the solenoid valve has a high operating speed, so the valve body can be operated quickly It was suitable as a shutoff valve that needed to shut off gas instantaneously.

  However, when a solenoid valve is applied to a gas pipe with a high flow rate, a large valve body that matches the gas flow rate and a large electromagnet that generates a strong magnetic force that can open and close the valve body are required. There was a problem that the valve was enlarged. In addition, since the solenoid valve opens and closes the valve body by magnetic force, the opening and closing operation is affected by gravity, and therefore, the assembling direction to the gas pipe (for example, the moving direction of the movable iron piece is horizontal). There was a problem that there were restrictions and the number of places that could be incorporated into gas piping was limited. In addition, the solenoid valve is composed of the valve element, the movable iron piece, and the electromagnet in one piece. In other words, only a part of them cannot be replaced. In addition, since the entire system is replaced, a lot of work time is required, resulting in a problem that the maintenance cost becomes high.

  In order to avoid the problems in these solenoid valves, in recent years, a motor valve that opens and closes a valve element using a motor has been adopted as a gas shut-off valve. An example of this motor valve is shown in FIG.

  The gas shut-off valve 700 includes a valve body portion 701 and a valve driving portion 702 fixed to the upper portion of the valve body portion 701 with a bolt.

  The valve body portion 701 includes a first port 731, a valve chamber 733, a pipe line 734, and a second port 732 that are sequentially connected to each other, and a spherical body that is rotatably disposed in the valve chamber 733. And a ball valve 704 which is a valve body. The ball valve 704 includes a conduction path 704a provided through the center and a driven shaft 741 connected to the upper portion.

  The valve drive unit 702 includes a valve drive motor 705 and a rotational force transmission mechanism 706. The rotational force transmission mechanism 706 is a small-diameter gear 761 coaxially fixed to the main shaft 751 of the valve driving motor 705, a large-diameter gear 762 meshed with the gear 761, and a rotational shaft of the gear 762 and is connected thereto. And a drive shaft 707 that is coaxially connected to the driven shaft 741 of the ball valve 704 by a pin 708.

  The gas shut-off valve 700 transmits the forward / reverse rotation (rotation) of the valve drive motor 705 to the ball valve 704 via the rotational force transmission mechanism 706, so that the ball valve 704 is approximately 90 degrees in the valve chamber 733. Accordingly, the first port 731 and the conduit 734 are electrically connected (that is, the gas shut-off valve 700 is fully opened) with the central axes of the conductive passage 704a and the conduit 734 being parallel (that is, fully opened position). ) Or the central axis of the conduction path 704a and the pipe line 734 are orthogonal (that is, the fully closed position), and the first port 731 and the pipe line 734 are blocked by the ball valve 704 itself (that is, the gas cutoff valve). 700 in a fully closed state).

  In addition, the gas shut-off valve 700 easily separates the valve drive unit 702 and the valve body unit 701 by pulling out the connecting pin 708 and removing the bolt that fixes the valve drive unit 702 to the valve body unit 701. be able to.

  According to this gas shut-off valve 700, since the large ball valve 704 can be driven by the small valve drive motor 705 by the rotational force transmission mechanism 706, even when the gas shut-off valve is installed at a location where the gas flow rate is high, It is possible to avoid an increase in size, and since the opening and closing operation of the ball valve 704 is not affected by gravity or the like, the installation location is not limited, and the ball valve 704 can be incorporated at any location on the gas pipe. Since the body part 701 and the valve drive part 702 can be separated, it is possible to replace only the valve drive motor 705 that is liable to cause a failure, and the maintenance cost can be kept low. Further, since the ball valve 704 is rotated by the valve drive motor 705, the operation speed is slower than that of the solenoid valve. However, the operation necessary as a gas shut-off valve can be achieved by appropriately adjusting the reduction ratio between the gear 761 and the gear 762. The speed could be secured.

  It should be noted that there is no prior art document information to be disclosed because there is no document known invention related to the present invention that the applicant knows at the time of filing the patent.

  However, the gas shut-off valve 700 described above is opened and closed by rotating the ball valve 704 by the valve driving motor 705, so that the valve element reaches the fully closed position from the fully open position, or conversely, from the fully closed position. Until reaching the fully open position, the valve body is in the middle position between the fully open position and the fully closed position, that is, there is a half-open state in which the gas cutoff valve 700 is incompletely opened, and the gas cutoff In the valve 700, for example, when the ball valve 704 and the valve chamber 733 remain in contact with each other for a long time, or foreign matter enters the gap between the ball valve 704 and the valve chamber 733 and is caught by each other. The rotation resistance of the ball valve 704 increases, the torque of the valve driving motor 705 becomes insufficient, and the ball valve 704 is in the above-mentioned midway position (that is, in a half-open state). There would stop fear (i.e., sticking of the ball valve 704). When the gas shut-off valve 700 stops in this half-open state in the conduction operation (full open operation) of the gas shut-off valve 700, a necessary amount of gas is supplied to the gas demanding device connected downstream of the gas shut-off valve 700. There was a problem that it could lead to a serious accident because the gas could not be supplied. Further, since the gas shut-off valve 700 cannot notify the user that the gas shut-off valve 700 has stopped in this half-open state, the shut-off valve 700 continues to be used even though the gas shut-off valve 700 cannot operate normally, resulting in a serious accident. There was a problem that there was a risk of reaching.

  The present invention aims to solve the above problems. That is, the present invention provides a gas shut-off valve unit that can prevent the valve body from being used in an incompletely opened half-open state and can notify the user of the occurrence of the half-open state. It is aimed.

  In order to achieve the above object, the invention described in claim 1 includes a flow path connected to a gas pipe, and a valve body rotatably incorporated in the flow path and opening and closing the flow path. A motor for rotating the valve body, an open drive control means for positively driving the motor so as to rotate the valve body from a fully closed position to a fully open position, and the motor by the open drive control means. An open position sensor for detecting whether or not the valve body is in the fully open position after being driven; and a closed position sensor for detecting whether or not the valve body is in the fully closed position. In the valve unit, when the open position sensor detects that the valve body is not in the fully open position, an abnormality determining unit that determines that there is an abnormality in the opening operation of the valve body; and If there is an abnormality in the opening movement of the body Closed, the motor is reversely driven to rotate the valve body toward the fully closed position until the closed position sensor detects that the valve body is in the fully closed position. A gas comprising: drive control means; and failure notification means for notifying that a failure has occurred when it is determined by the abnormality determination means that there is an abnormality in the opening operation of the valve body. It is a shut-off valve unit.

  According to the first aspect of the present invention, when the valve element is not rotated to the fully open position in the opening operation for rotating the valve element from the fully closed position to the fully open position, the valve element is returned to the fully closed position. Therefore, it is possible to notify the failure while returning the valve body to the original fully closed position, so that the valve body stops at the middle position between the fully closed position and the fully opened position. It is possible to prevent the supply from being performed and to notify the user of the occurrence of the failure. Therefore, the valve body can be prevented from being used in an incompletely opened half-open state, and the user can be notified of the occurrence of this half-open state (ie, a failure), which may be caused by the half-open state. A serious accident can be avoided.

  Hereinafter, the gas cutoff valve unit which shows embodiment of this invention is demonstrated with reference to FIGS.

  As shown in FIG. 1, the gas cutoff valve unit 100 includes a valve body portion 1 and a valve drive portion 2.

  The valve body portion 1 includes a valve housing 3 formed into a tubular shape, and a ball valve 4 incorporated in the valve housing 3.

  The valve housing 3 includes a first port 31 formed of a taper screw formed at one end and screwed to a gas pipe (not shown), and a taper screw formed at the other end and screwed to a gas pipe (not shown). A second port 32, and a valve chamber 33 and a conduit 34 formed so as to be connected to each other between the first port 31 and the second port 32 are provided. The first port 31, the valve chamber 33, the pipe line 34, and the second port 32 are sequentially connected to form one conduit (that is, corresponding to the flow path described in the claims). The first port 31, the pipe line 34, and the second port 32 are arranged so that the central axes thereof are positioned on the same line. The valve housing 3 is provided with a mounting seat 3A for mounting the valve drive unit 2.

  The valve chamber 33 is a substantially cylindrical space formed so that the axis is perpendicular to the central axis of the conduit 34. In the valve chamber 33, valve seats 35, 35 are arranged along the periphery of the opening portion connected to the first port 31 and the pipe line 34, and the ball valve 4 Arranged in the chamber 33 so as to be in close contact with the valve seats 35, 35.

  The ball valve 4 corresponds to the valve body described in the claims, and is formed in a substantially spherical shape. The ball valve 4 includes a conduction path 4a that passes through the center thereof, and a driven shaft 41 that is connected to the outer surface of the ball valve 4 and serves as a rotation shaft of the ball valve 4. The ball valve 4 is rotatably disposed in the valve chamber 33 so that the driven shaft 41 and the shaft core of the valve chamber 33 are located on the same line and with a slight gap between the ball valve 4 and the valve chamber 33. The driven shaft 41 is supported by a bearing (not shown) provided in the valve housing 3, and the end of the driven shaft 41 is exposed to the outside of the valve housing 3.

  Further, the ball valve 4 rotates approximately 90 degrees in the valve chamber 33 about the driven shaft 41 as a rotation shaft, whereby the gas shut-off valve unit 100 is switched between the fully open state and the fully closed state. That is, as shown in FIG. 7A, when the central axis of the conduction path 4a and the central axis of the pipe 34 are substantially orthogonal (that is, the fully closed position), the ball valve 4 itself and the first port 31 are connected to the pipe. When the passage 34 is blocked (that is, fully closed), and the center axis of the conduction passage 4a and the center axis of the pipe 34 are parallel (that is, fully opened position) as shown in FIG. 9A. The first port 31 and the pipe line 34 are electrically connected (that is, fully opened) through the conductive path 4a.

  The valve drive unit 2 includes a lower case unit 2A incorporating a valve drive motor 5, a rotational force transmission mechanism 6, a display unit (not shown), and an upper case unit 2B incorporating a microcomputer 10. I have.

  The valve drive motor 5 corresponds to the motor described in the claims, and is a well-known stepping motor that rotates in response to a pulse signal (number of pulses, etc.) input as a control signal. The valve driving motor 5 is disposed in the lower case portion 2A with its main shaft 51 protruding from the upper case portion 2B. The valve driving motor 5 is connected to the microcomputer 10, and driving (turning) control is performed by a pulse signal input from the microcomputer 10.

  The rotational force transmission mechanism 6 includes a small gear 61 that is coaxially fixed to the tip of the main shaft 51 of the valve drive motor 5, a large gear 62 that is meshed with the small gear 61, and a rotation of the large gear 62. A drive shaft 7 supported by a bearing 22 provided in the upper case portion 2B as a moving shaft, and a first photo interrupter 9A and a second photo interrupter 9B for detecting the rotational position of the large gear 62 are provided. .

  The drive shaft 7 is exposed to the valve body 1 side from the upper case portion 2B, and the drive shaft 7 is coaxially connected to the driven shaft 41 of the ball valve 4 by a connecting pin 8. That is, the large gear 62 and the ball valve 4 rotate coaxially and synchronously with each other.

  As shown in FIG. 2, the small gear 61 is a gear having teeth 61a formed on the entire circumference thereof. The large gear 62 is formed in a fan shape whose diameter is larger than that of the small gear 61, and teeth 62a are formed on a part of the arc-shaped peripheral edge. Further, the large gear 62 is formed with step portions 621A and 621B at two positions separated by approximately 180 degrees, and a fan shape with a reduced diameter is formed between the step portions 621A and 621B on the side opposite to the teeth 62a. A notch 622 is formed. End portions of the notch 622 in the rotational circumferential direction are contact surfaces 622A and 622B.

  The first photo interrupter 9A corresponds to the closed position sensor described in the claims. For example, the first photo interrupter 9A includes a light emitting unit composed of an infrared LED and a light receiving unit composed of a photo sensor arranged to face the light emitting unit. , And the position of the object is determined by detecting the presence or absence of light from the light emitting unit by the light receiving unit. The first photo interrupter 9A is arranged so that the arc-shaped peripheral edge of the large gear 62 is sandwiched between the light emitting part and the light receiving part. The first photo-interrupter 9A detects the light from the light emitting part with the light receiving part when the ball valve 4 is rotated to the fully closed position, that is, when the ball valve 4 is in the fully closed position. The positional relationship with the stepped portion 621A of the large gear 62 is determined so that it is turned on at other times and turned off at other times.

  The second photo interrupter 9B corresponds to the open position sensor described in the claims, is the same as the first photo interrupter 9A, and, like the first photo interrupter 9A, has an arcuate shape of the large gear 62. Are arranged so as to be sandwiched between the light emitting part and the light receiving part. The second photo interrupter 9B is turned on so that the light from the light emitting portion is detected by the light receiving portion when the ball valve 4 is rotated to the fully open position, that is, when the ball valve 4 is in the fully open position, The positional relationship with the stepped portion 621B of the large gear 62 is determined so as to be turned off at other times.

  Further, the upper case portion 2B is integrally provided with a boss portion 21 that is formed so as to protrude from the inner surface of the upper case portion 2B toward the large gear 62. As shown in FIG. 3, the boss portion 21 comes into contact with the contact surface 622A of the large gear 62 when the ball valve 4 rotates beyond the fully closed state and out of the normal rotation range. When the ball valve 4 is rotated beyond the fully open state and out of the normal rotation range, the rotation of the large gear 62 is stopped by contacting the contact surface 622B of the large gear 62. Thereby, abnormal rotation in the ball valve 4 can be prevented, and an abnormal valve state can be avoided.

  The display unit is a part for notifying the user of the gas shut-off valve unit 100 of the operation state and the like, for example, a numerical value such as a two-digit 7-segment LED disposed on the surface of the upper case unit 2B. Is displayed, and numerical values corresponding to the respective states of the gas cutoff valve unit 100 are displayed. As an example in this embodiment, when the gas shut-off valve unit 100 is operating normally in the fully open state, “00” is always lit on and the ball valve 4 is rotated from the fully closed position to the fully open position. When an abnormality is detected in the opening operation, “31” is blinked.

  A microcomputer (hereinafter referred to as MPU) 10 is a well-known small computer suitable for an embedded device. As shown in FIG. 4, the MPU 10 performs central processing for performing various processes and controls according to a predetermined program. A device (CPU) 11, a ROM 12 that is a read-only memory storing a program and control data for the CPU 11, and a readable / writable memory that stores various data and has an area necessary for processing operations of the CPU 11 And an I / O unit 14 connected to the valve drive motor 5, the first photointerrupter 9A, and the second photointerrupter 9B for transmitting / receiving control information to / from them. Yes. Further, the I / O unit 14 is connected to a display unit (not shown), and displays a numerical value indicating an operation state or the like of the gas cutoff valve unit 100 on the display unit.

  As shown in FIG. 5, the CPU 11 is based on a program stored in the ROM 12. (1) Open drive that positively drives the valve drive motor 5 so as to rotate the ball valve 4 from the fully closed position to the fully open position. When the second photo interrupter 9B detects that the ball valve 4 is not in the fully open position after the valve drive motor 5 is positively driven by the control means 11a and (2) the open drive control means 11a, the ball valve 4 Abnormality determining means 11b for determining that the opening operation of the ball valve 4 is abnormal. (3) When the abnormality determining means 11b determines that the opening operation of the ball valve 4 is abnormal, the first photo interrupter 9A A closed return drive that reversely drives the valve drive motor 5 to rotate the ball valve 4 toward the fully closed position until it is detected to be in the closed position. When the controller 11c and (4) the abnormality determining unit 11b determine that the opening operation of the ball valve 4 is abnormal, the controller 11c functions as a failure notification unit 11d that displays a numerical value corresponding to the failure on the display unit. Is. Further, the forward drive and the reverse drive indicate relative rotation directions, that is, in the fully open operation, the direction in which the ball valve 4 is rotated by the open drive control means 11a is defined as “forward drive” and vice versa. Driving in the direction is called “reverse driving”.

  Further, the ROM 12 drives a valve drive motor 5 corresponding to an upper limit angle (for example, 105 degrees) required for rotating the ball valve 4 from the fully closed position to the fully open position as control data. The upper limit number of pulses (for example, 4200 pulses) is stored.

  Next, an example of the fully open process according to the present invention executed by the CPU 11 described above will be described with reference to the flowchart shown in FIG.

  In the gas shut-off valve unit 100, the ball valve 4 is positioned at the fully closed position in the initial state, and when the gas shut-off valve unit 100 is turned on, a predetermined initialization process is performed, and then the ball valve 4 In order to position 4 at the fully open position, the processing of the CPU 11 proceeds to step S110.

  In step S110, the valve drive motor 5 corresponds to this unit angle so that the ball valve 4 which is the valve body is rotated by a predetermined unit angle (for example, 1 degree) toward the fully open position. A number of pulses (for example, 40) are transmitted. Then, the process proceeds to step S120.

  In step S120, it is determined whether or not the ball valve 4 has reached the fully open position, that is, whether the second photo interrupter 9B has been turned on or off. When the ball valve 4 is on, the ball valve 4 has normally reached the fully open position. Then, the process of this flowchart is ended (Y in S120), and when it is off, the ball valve 4 has not reached the fully open position (that is, in the middle position), and the process proceeds to step S130 (N in S120).

  In step S130, the angle at which the ball valve 4 is rotated in step S110 is integrated, that is, the number of pulses transmitted to the valve drive motor 5 in step S110 is integrated, and the integrated number of pulses is stored in the ROM 12. The upper limit pulse number is compared. When the accumulated number of pulses exceeds the upper limit number of pulses, the ball valve 4 has not reached the fully open position even though the ball valve 4 has rotated beyond the upper limit angle, that is, the ball valve 4 If the accumulated number of pulses is equal to or less than the upper limit number of pulses, the process proceeds to step S110 to rotate the ball valve 4 again by a unit angle (S130). N).

  In step S140, assuming that the gas shut-off valve unit 100 has failed, the I / O unit 14 causes the display unit to flash the numerical value “31” indicating the failure. Then, the process proceeds to step S150.

  In step S150, the number of pulses (for example, 40) corresponding to the unit angle is transmitted to the valve driving motor 5 so that the ball valve 4 is rotated by the unit angle described above toward the fully closed position. To do. Then, the process proceeds to step S160.

  In step S160, it is determined whether or not the ball valve 4 has reached the fully closed position, that is, it is determined whether the first photo interrupter 9A is on or off. When the ball valve 4 is on, the ball valve 4 has normally reached the fully closed position. As a result, the processing of this flowchart is finished (Y in S160), and when it is off, it is assumed that the ball valve 4 has not reached the fully closed position (that is, is in the middle position), and again toward the fully closed position. The process proceeds to step S150 to rotate the unit angle (N in S160).

  Note that steps S110, S120, and S130 correspond to the open drive control means described in the claims, step S130 also corresponds to the abnormality determination means, and steps S150 and S160 also correspond to the closing return drive control means. Step S140 also corresponds to failure notification means.

  Next, an example of the fully open operation according to the present invention in the gas cutoff valve unit 100 will be described with reference to FIGS.

  FIG. 7A is a diagram showing a state in which the ball valve 4 is in the fully closed position, and FIG. 7B is a diagram illustrating the first photo interrupter 9A, the second photo interrupter 9B, and the large gear 62 at that time. It is a figure which shows these positional relationships. FIG. 8A is a diagram showing a state in which the ball valve 4 stops rotating at a midway position between the fully closed position and the fully opened position, and FIG. 8B shows the first photo interrupter at that time. It is a figure which shows the positional relationship of 9A, the 2nd photo interrupter 9B, and the large gearwheel 62. FIG. FIG. 9A is a diagram showing a state in which the ball valve 4 is in the fully open position, and FIG. 9B is a diagram of the first photo interrupter 9A, the second photo interrupter 9B, and the large gear 62 at that time. It is a figure which shows a positional relationship.

  As shown in FIG. 7, when the ball valve 4 is in the fully closed position, the arcuate peripheral edge of the large gear 62 is positioned between the light emitting part and the light receiving part of the second photo interrupter 9B. That is, the light of the light emitting unit is blocked and the second photo interrupter 9B is turned off. This indicates that the ball valve 4 is not in the fully open position. Further, in the first photo interrupter 9A, the step portion 621B is positioned slightly shifted toward the second photo interrupter 9B between the light emitting portion and the light receiving portion, that is, the light of the light emitting portion reaches the light receiving portion. The first photo interrupter 9A is turned on. This indicates that the ball valve 4 is in the fully closed position (that is, the fully closed state). In this fully closed state, when an opening operation for rotating the ball valve 4 from the fully closed position to the fully opened position is started, the large gear 62 is moved from the stepped portion 621B to the second photo interrupter 9B by the valve driving motor 5. It starts to rotate in the approaching direction (ie, the positive direction) (S110). Further, since the large gear 62 and the ball valve 4 are connected by the drive shaft 7 and the driven shaft 41, they are rotated in synchronization with each other.

  When the large gear 62 is rotated in the forward direction, the light emitted from the light emitting portion of the first photo interrupter 9A is blocked by the arc-shaped peripheral edge of the large gear 62, the first photo interrupter 9A is turned off, and When the movement proceeds and the foreign substance I solidified by the components contained in the gas enters the gap between the ball valve 4 and the valve chamber 33, the ball valve 4 is caught and the rotational resistance increases, as shown in FIG. As described above, the ball valve 4 stops at an intermediate position. Even in this state, the valve drive motor 5 rotates until the second photo interrupter 9B is turned on (S120) or until the rotation angle of the ball valve 4 reaches the upper limit angle 105 degrees (S130). Continue. At this time, the large gear 62 and the ball valve 4 are not actually rotated.

  When the second photo interrupter 9B remains off even when the rotation angle reaches 105 degrees, it is assumed that there is an abnormality in the fully open operation, that is, the gas shut-off valve unit 100 has failed. A numerical value “31” indicating a failure is blinkingly displayed (S140), and at the same time, the large gear 62 is moved away from the second photo interrupter by the valve drive motor 5 (ie, in the reverse direction). The first photo interrupter 9A is rotated until it is turned on (S150, S160). Finally, the ball valve 4 is returned to the fully closed position.

  Further, in the fully closed state shown in FIG. 7, after starting the fully opening operation for rotating the ball valve 4 from the fully closed position to the fully open position, when the ball valve 4 reaches the fully open position and becomes fully open, In response to the photo interrupter being turned on, the driving of the valve driving motor 5 is stopped, and the display unit indicates that it is operating normally in the fully opened state (that is, it has been normally fully opened). “00” is displayed.

  As described above, according to the present invention, when the ball valve 4 is not rotated to the fully open position in the opening operation in which the ball valve 4 is rotated from the fully closed position to the fully open position, the ball valve 4 is returned to the fully closed position. Since the failure state can be displayed while the ball valve 4 is returned to the original fully closed position, the ball valve 4 is stopped at an intermediate position between the fully closed position and the fully open position. It is possible to prevent the gas from being supplied and to notify the user of the occurrence of the failure. Therefore, it is possible to prevent the ball valve 4 from being used in an incompletely opened half-open state, and to notify the user of the occurrence of the half-open state (that is, failure), which may be caused by the half-open state. A serious accident can be avoided.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is sectional drawing of the gas cutoff valve unit which shows embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is a figure which shows the rotation range of a large gearwheel. It is a block diagram which shows the structure and connection of a microcomputer. It is a block diagram which shows the function of a microcomputer. It is a flowchart which shows an example of the process which concerns on this invention in CPU of a microcomputer. (A) is a figure which shows the state which has a ball valve in a fully closed position, (B) is a figure which shows the positional relationship of the 1st photo interrupter in the state, a 2nd photo interrupter, and a large gearwheel. is there. (A) is a figure which shows the state which the ball valve stopped in the middle position, (B) is a figure which shows the positional relationship of the 1st photo interrupter in the state, a 2nd photo interrupter, and a large gearwheel. is there. (A) is a figure which shows the state which has a ball valve in a fully open position, (B) is a figure which shows the positional relationship of the 1st photo interrupter in the state, a 2nd photo interrupter, and a large gearwheel. . It is sectional drawing which shows the conventional gas cutoff valve.

Explanation of symbols

1 Valve body part 2 Valve drive part 4 Ball valve (valve body)
5 Valve drive motor (motor)
6 Rotational force transmission mechanism 9A First photo interrupter 9A (open position sensor)
9B Second photo interrupter 9B (closed position sensor)
10 Microcomputer 11a Open drive control means (CPU)
11b Abnormality determination means (CPU)
11c Closed return drive control means (CPU)
11d Failure notification means (CPU)
62 Large gear 100 Gas shut-off valve unit

Claims (1)

A flow path connected to a gas pipe, a valve body rotatably incorporated in the flow path and opening and closing the flow path by rotation, a motor for rotating the valve body, and the valve body being fully closed An open drive control means for positively driving the motor to rotate from a position to a fully open position; and whether the valve body is in the fully open position after the motor is positively driven by the open drive control means. In a gas shutoff valve unit having an open position sensor for detecting, and a closed position sensor for detecting whether or not the valve body is in the fully closed position,
An abnormality determining means for determining that there is an abnormality in the opening operation of the valve body when the open position sensor detects that the valve body is not in the fully open position;
When the abnormality determining means determines that there is an abnormality in the opening operation of the valve body, the valve body is moved to the fully closed position until the closed position sensor detects that the valve body is in the fully closed position. Closed return drive control means for reversely driving the motor so as to rotate toward
A gas shut-off valve unit comprising: failure notification means for notifying that a failure has occurred when the abnormality determination means determines that there is an abnormality in the opening operation of the valve body.

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