JP2005054902A - Valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve when the valve is needed to urgently close or on a power failure. <P>SOLUTION: In the valve, a passage 4 inside formed between a fluid inlet 2 and a fluid outlet 3 in a valve box 1 is partitioned into the fluid inlet 2 side and the fluid outlet 3 side with a valve seat 6, a valve port 7 of a valve seat 6 is opened and closed with a valve body 8 supported in a valve stem 12. The valve stem 12 is driven back and forth by an opening and closing drive means 13 in the axial direction. The valve port 7 is closed with a valve body 8 supported therewith by advancing, and opened by retreating. An opening and driving means 13 is provided with a motor 14, a spring 16 which is urged and stored by receiving the rotation of an output shaft 15 of the motor 14 revolving with an electric contact, and revolved in the opposite direction for an output shaft 15 of the motor 14 with a resilient force urged when the motor 14 is cut off, and a motion transforming mechanism 17 for transforming a rotation movement of the output shaft 15 of the motor 14 into a linear movement forwarding the valve stem 12, retreating the valve shaft 12 with the rotation of the output shaft 15 revolving with the resilient force of the spring 16 in the opposite direction when the motor 14 is cut off. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a valve for opening and closing a fluid flow path.

  As a valve for controlling the flow rate of fluid, a flow path in a valve box having a fluid inlet portion and a fluid outlet portion is partitioned by a valve seat, and a valve hole of the valve seat is opened and closed by a valve body supported by a valve shaft. The valve shaft is driven by an opening / closing drive means back and forth in the axial direction thereof, and there is a valve that moves forward and closes and retreats with a valve body supported by the valve body. .

Conventionally, in this type of valve, a pulse motor is used as the driving means, and the rotational force of the pulse motor is converted into a linear motion so that the valve shaft is moved forward and backward to open and close the valve hole. It is known (for example, see Patent Document 1).
Japanese Patent No. 2608579

  However, according to the above-described valve, any opening / closing operation of the valve body must be performed by driving a pulse motor. Therefore, for example, when the valve needs to be closed urgently, the valve is instantaneously closed. In the event that a power failure occurs when the valve is open, the valve cannot be closed, which may cause problems with the equipment that uses the fluid. there were.

  An object of the present invention is to provide a valve that can be instantaneously closed when it is necessary to close the valve urgently or during a power failure.

  In order to achieve the above object, in the valve according to claim 1, a flow path is formed between a fluid inlet portion and a fluid outlet portion in a valve box, and the inside of the flow path is a valve seat and the fluid inlet side. And the valve hole of the valve seat is opened and closed by a valve body supported by the valve shaft, and the valve shaft is driven back and forth in the axial direction by opening and closing drive means. A valve that is advanced to close the valve hole with the supporting valve element, and retreats to open. The opening / closing drive means includes a motor and rotation of an output shaft of the motor that is rotated by energization. And a spring that rotates the output shaft of the motor in the opposite direction by the stored elastic force when the power to the motor is cut off, and the rotational motion of the motor output shaft is converted into a linear motion. When the motor is energized, rotation of the output shaft causes the valve shaft to retreat, and the motor is de-energized. Characterized in that it is constituted by a motion converting mechanism for advancing the valve shaft by the rotation of the output shaft to rotate in the opposite direction by the elastic force of the serial spring.

    With this configuration, when the motor is driven by energization to rotate the output shaft, the spring is stored, and the rotational motion of the output shaft of the motor is converted into linear motion by the motion conversion mechanism, and the output shaft Rotation of the valve shaft retreats, the valve body is separated from the valve seat, and the valve hole is opened.

  At this time, by controlling the rotation speed and rotation amount of the motor, the separation speed and the separation amount (flow rate) of the valve body from the valve seat can be controlled.

  When the motor is de-energized, the spring accumulated by receiving the rotation of the output shaft of the motor that is rotated by the energization rotates the output shaft of the de-energized motor in the opposite direction by its elastic force. Then, the rotational movement of the output shaft is converted into a linear motion by the motion conversion mechanism, the valve shaft advances by the rotation of the output shaft, the valve body comes into contact with the valve seat, and the valve hole is instantaneously closed.

  The valve according to claim 2 is a canned motor in which the opening / closing drive means according to claim 1 is configured such that a partition between the output shaft and a portion that applies a rotational force to the output shaft is sealed with a partition wall. It is characterized by comprising.

  With this configuration, since the motor is composed of a canned motor in which a space between the output shaft and the portion that applies the rotational force to the output shaft is sealed with a partition wall, the fluid from the portion that applies the rotational force to the output shaft of the motor A situation such as leakage can be reliably prevented.

  As described above, according to the valve of the present invention, when the valve is opened, the valve hole can be slowly opened to the set flow rate, and when the valve needs to be urgently closed or during a power failure, the valve hole is opened. Since it can be closed instantaneously, it is possible to prevent the occurrence of troubles in the device using the fluid and to ensure safety.

  FIGS. 1 to 3 show an example of the best mode for carrying out the valve according to the present invention. FIG. 1 is a longitudinal sectional view showing a state in which a valve hole is opened in the valve of this example, and FIG. XX sectional drawing, FIG. 3 is a longitudinal cross-sectional view of the state which closed the valve hole with the valve | bulb of this example.

  In the valve of this example, the valve box 1 is provided with a fluid inlet part 2 connected to the supply side pipe and a fluid outlet part 3 connected to the discharge side pipe, and the fluid inlet part 2 and the fluid outlet part 3 are provided inside. A connecting channel 4 is provided.

  The flow path 4 is a partition wall 5 and a valve seat 6 provided on the partition wall 5, and the fluid inlet portion 2 and the fluid outlet portion 3 are partitioned. The valve seat 6 has a valve hole 7 communicating with the fluid inlet portion 2 side and the fluid outlet portion 3 side, and the valve hole 7 is opened and closed by a valve body 8 disposed on the fluid inlet portion 2 side. It has become so.

  The valve body 8 includes a disc-shaped rigid valve body portion 9 formed of metal or the like, and a disk-shaped elastic valve body portion 10 formed of rubber or the like superimposed on the rigid valve body portion 9; It is composed of a disc-like valve holder 11 formed on a metal plate or the like that is superimposed on the elastic valve body 10 and prevents deformation of the elastic valve body 10. The outer diameter of the elastic valve body portion 10 is formed larger than the outer diameter of the rigid valve body portion 9, and the lower surface of the elastic valve body portion 10 protruding outward from the outer diameter of the rigid valve body portion 9 is a tapered surface. It has become.

  Further, in the valve seat 6 with which the valve body 8 configured as described above abuts, the small diameter valve seat surface 6a with which the rigid valve body portion 9 abuts and the large diameter with which the tapered surface of the elastic valve body portion 10 abuts. A valve seat surface 6b is formed, and when the valve body 8 contacts the valve seat 6, the tapered surface of the elastic valve body portion 10 first contacts the large-diameter valve seat surface 6b. The position is set so that the rigid valve element 9 abuts against the small-diameter valve seat surface 6a through the deformation of the tapered surface.

  The valve body 8 is connected and supported at the tip of the valve shaft 12, and this valve shaft 12 is driven by the opening / closing drive means 13 back and forth in the axial direction thereof, and advances to support the valve body 8 supported by the valve body 8. The valve hole 7 is closed by being brought into contact with the seat 6, and is opened backward.

  The opening / closing drive means 13 is stored by receiving the rotation of the motor 14 and the output shaft 15 of the motor 14 that rotates by energization. When the motor 14 is de-energized, the opening / closing drive means 13 A spring 16 that rotates the output shaft 15 in the opposite direction, and a rotational motion of the output shaft 15 of the motor 14 is converted into a linear motion, and the valve shaft 12 is moved backward by the rotation of the output shaft 15 when the motor 14 is energized, The motor 14 is configured to include a motion conversion mechanism 17 that advances the valve shaft 12 by the rotation of the output shaft 15 that rotates in the opposite direction by the elastic force of the spring 16 when the energization is cut off.

  As the motor 14, a pulse motor that can easily control the rotation direction, the rotation speed, and the rotation amount is used. The motor 14 includes a canned motor 14A sealed between the output shaft 15 and a portion that applies a rotational force to the output shaft 15 with a partition wall 18 made of a nonmagnetic material. The partition wall 18 is integrated with the valve box 1. The axis of the output shaft 15 is arranged so as to coincide with the axis of the valve shaft 12.

  In this example, the canned motor 14A is rotatably disposed in a stator 19 disposed on the outer periphery of a partition wall 18 having a bottomed cylindrical shape, and in the partition wall 18 formed in the cylindrical shape, The rotor 20 is rotated by excitation of the stator 19, and the output shaft 15 is fixed to the rotation axis of the rotor 20. The output shaft 15 passes through a support member 22 that is attached to the valve box 1 and forms a spring accommodating space 21 that accommodates the spring 16 between the output shaft 15 and the tip of the output shaft 15 is inside the spring accommodating space 21. In this state, the support member 22 is rotatably supported via a bearing 23. When the stator 19 is energized and excited, the rotor 20 is rotated, and the output shaft 15 is rotated by the rotation of the rotor 20. The output shaft 15 is provided with a screw hole 24 that forms a part of the motion conversion mechanism 17, which will be described in detail later.

  As shown in FIG. 2, a spiral spring 16 a is used for the spring 16, and the spring 16 is accommodated in the spring accommodating space portion 21 formed between the valve box 1 and the support member 22, and the distal end portion thereof Is fixed to the inner wall of the support member 22 with a fixing pin 25, and the centripetal side end penetrates the support member 22 and is inserted into the spring accommodating space portion 21. It is fixed. As described above, the output shaft 15 is rotated by energization of the motor 14, is wound and stored, and when the motor 14 is de-energized, the output shaft is generated by the stored elastic force. 15 is rotated in the opposite direction.

  As described above, the motion conversion mechanism 17 converts the rotational motion of the output shaft 15 into a linear motion and changes the rotational direction of the output shaft 15 to move the valve shaft 12 forward and backward. A screw hole 24 provided in the output shaft 15, a male screw portion 27 formed in the valve shaft 12 and screwed into the screw hole 24, and the valve shaft 12 by rotating the output shaft 15 while preventing the valve shaft 12 from rotating. It is comprised with the rotation stop means 28 which makes 12 move linearly.

  The anti-rotation means 28 includes a long hole 29 formed in the valve shaft 12 in the axial direction thereof, and a detent pin 30 provided in the valve box 1 and slidably inserted into the long hole 29. Has been.

  Furthermore, in this example, a coil spring 31 for biasing the valve body 8 in the direction of the valve seat 6 is interposed between the valve box 1 and the valve body 8, and in addition to the elastic force of the spiral spring 16a, The spring force of the coil spring 31 allows the valve shaft 12 to move forward more quickly, so that a more reliable valve closing state can be obtained.

  In the valve constructed as described above, the valve body 8 is brought into contact with the valve seat 6 and the valve closed state with the valve hole 7 closed is set as the origin (FIG. 3). When the valve is first opened, the stator 19 is energized and excited. Thus, when the rotor 20 is rotated and the motor 14 is driven, the output shaft 15 is rotated by the rotation of the rotor 20, and the rotational motion of the output shaft 15 is converted into linear motion on the valve shaft 12 via the motion conversion mechanism 17. Then, the valve shaft 12 moves backward, and the valve body 8 is separated from the valve seat 6 to open the valve hole 7 (FIG. 1). At this time, by controlling the rotation speed and rotation amount of the motor 14, the separation speed and separation amount (flow rate) of the valve body 8 from the valve seat 6 can be controlled. At the same time, the rotation of the output shaft 15 that is rotated by energization of the motor 14 is received, and the spiral spring 16a is wound and stored.

  In this state, when it is necessary to close the valve, if the motor 14 is deenergized, the spiral spring 16a stored by receiving the rotation of the output shaft 15 of the motor 14 that is rotated by the energization of the spring 14 Due to the force, the output shaft 15 of the motor 14 that has been de-energized is rotated in the opposite direction, and the rotational motion of the output shaft 15 is converted into a linear motion by the valve shaft 12 via the motion conversion mechanism 17 to the valve shaft 12. Then, the valve shaft 12 moves forward, the valve body 8 comes into contact with the valve seat 6 and the valve hole 7 is instantaneously closed.

  Similarly, at the time of a power failure, the spiral spring 16a accumulated by receiving the rotation of the output shaft 15 of the motor 14 rotated by energization rotates the output shaft 15 in the opposite direction by its elastic force, and this output shaft 15 is converted into a linear motion by the valve shaft 12 via the motion conversion mechanism 17 and transmitted to the valve shaft 12, the valve shaft 12 moves forward, the valve body 8 contacts the valve seat 6 and the valve hole. 7 is closed instantaneously (FIG. 3).

The longitudinal cross-sectional view which shows the state which the valve body opened in the example of the best embodiment of the valve | bulb which concerns on this invention. XX sectional drawing of FIG. The longitudinal cross-sectional view which shows the state which the valve body closed with the valve | bulb of this example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve box 2 Fluid inlet part 3 Fluid outlet part 4 Flow path 5 Partition wall 6 Valve seat 6a Small diameter valve seat surface 6b Large diameter valve seat surface 7 Valve hole 8 Valve body 9 Rigid valve body part 10 Elastic valve body part 11 Valve holding Body 12 Valve shaft 13 Opening / closing drive means 14 Motor 14A Canned motor 15 Output shaft 16 Spring 16a Spiral spring 17 Motion conversion mechanism 18 Partition 19 Stator 20 Rotor 21 Spring accommodating space 22 Support member 23 Bearing 24 Screw hole 25, 26 Fixing pin 27 Male thread portion 28 Non-rotating means 29 Long hole 30 Non-rotating pin 31 Coil spring

Claims (2)

A flow path is formed between a fluid inlet part and a fluid outlet part in the valve box, the inside of the flow path is partitioned by a valve seat into a fluid inlet part side and a fluid outlet part side, and the valve hole of the valve seat is a valve shaft The valve shaft is driven by the opening / closing drive means back and forth in the axial direction thereof, and advances and closes the valve hole with the supporting valve body and moves backward. And the valve is designed to open
The opening / closing drive means is stored by receiving the rotation of the motor and the output shaft of the motor that rotates by energization, and the output shaft of the motor is moved in the opposite direction by the elastic force accumulated when the energization to the motor is cut off. The rotating force of the spring and the output shaft of the motor is converted into a linear motion, the valve shaft is retracted by the rotation of the output shaft when the motor is energized, the energization of the motor is cut off, and the spring force of the spring And a motion conversion mechanism for moving the valve shaft forward by rotation of an output shaft rotating in the opposite direction. 2. The motor constituting the opening / closing drive means is constituted by a canned motor in which a gap between an output shaft and a portion for applying a rotational force to the output shaft is sealed with a partition wall. valve.

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