JP2006317004A - Shut-off valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve accuracy in operation of a valve element and to realize secure valve closing action. <P>SOLUTION: In a mechanism for converting rotating motion of a rotating shaft into linear motion of the valve element 15 by rotating the rotating shaft 11 by a stepping motor, and slidably engaging the valve element 15 with a lead screw 10 mounted on the rotating shaft 11, an engaging means slidable in the axial direction of the rotating shaft 11 is constructed between a flange 22 and the valve element 15, thus the rotation of the valve element 15 is controlled, and the accuracy in operating position of the valve element 15 to the rotation of the lead screw 10 is improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention uses a safety valve (international patent classification F16K 17/36) that operates according to an external situation and uses an electric motor as an operation means (international patent classification F16K 31/04), in particular, a gas shut-off device that prevents a gas accident in advance. More specifically, the present invention relates to a shutoff valve used as a shutoff mechanism, and more specifically, a motor that performs a shutoff return operation of the flow path by moving the valve body forward or backward relative to a valve seat formed in the flow path is used as a power source. It relates to the shut-off valve.

  Conventionally, this type of shut-off valve has a stud portion formed in a cap, and a hole in which the stud fits into the valve body, and converts the rotational motion of the rotor into a linear motion (see, for example, Patent Document 1). .

FIG. 5 shows a conventional shut-off valve described in Patent Document 1. As shown in FIG. As shown in FIG. 5, it is comprised from the valve body 9 provided with the flange 1, the stator 2, the rotor 5 provided with the rotating shaft 4 with the lead screw 3, the cap 7 provided with the stud 6, and the fitting hole 8. As shown in FIG. Yes.
Japanese Patent Laid-Open No. 11-2351

  However, in the conventional configuration, in order to convert the rotational movement of the rotary shaft into a linear motion with a lead screw, the stud formed on the cap is inserted into the hole of the valve body to stop the jointing of the valve body.

  However, when the rotational force of the valve body is applied to the cap, the cap rotates, and the valve opening / closing position deviates from the set position, resulting in incomplete shutoff or insufficient flow.

  The present invention solves the above-described conventional problems, and the valve opening and closing position is shifted by stopping rotation of the valve body with a flange that serves as a chassis that fixes the entire shut-off valve to the mounted portion. The object is to provide a reliable and reliable shut-off valve.

  In order to solve the above-described problems, the present invention provides a stator, a metallic partition disposed inside the stator, a rotor including a rotary shaft with a lead screw disposed inside the partition, A valve body having a female screw portion that fits into a lead screw and having a notch portion for preventing co-rotation, and a bearing that is coaxially arranged at the open end of the partition wall and through which the rotating shaft can pass. And a flange that separates the valve body and the stator and has a sealing surface between the lid and the flow path, and the valve body is fitted to the lead screw of the rotating shaft to form a straight line. It is provided with a rotation prevention structure that restricts the rotational force when performing exercise.

  As a result, no force is applied to the structurally unstable cap, so that the valve opening and closing position of the valve body will not be inadvertently shifted. A high shutoff valve can be provided.

  Since the shut-off valve of the present invention has a structure in which the valve opening / closing position of the valve body is not inadvertently shifted, the certainty of the valve opening / closing can be improved.

  A shutoff valve according to claim 1 of the present invention is a stator, a metallic partition disposed inside the stator, a rotor including a rotary shaft with a lead screw disposed inside the partition, A valve body having a female thread portion that fits into the lead screw and having a notch portion for preventing co-rotation, and a hole that is coaxially disposed at the open end of the partition wall and through which the rotating shaft can pass are provided. A flange having a seal surface between the lid housing the bearing and the flow path is provided to partition the valve body and the stator, and the valve body is fitted to the lead screw of the rotating shaft. By using a shut-off valve with an anti-rotation structure that restricts the rotational force when performing linear motion, the valve element is prevented from rotating with a flange that serves as a chassis that is fixed to the flow path that is the attached part. By the disc Opening closing position it is possible to provide a high cutoff valve without reliable deviate unexpectedly in force.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a sectional view of a shutoff valve in the first embodiment of the present invention. In FIG. 1, a partition wall 13 covers the periphery of a rotor 12 having a rotary shaft 11 with a lead screw 10, and a lid 14 provided with a bearing portion is disposed on the lead screw side of the partition wall.

  As shown in FIG. 2, the valve body 15 inserted into the lead screw 10 has a notch 18 a having a notch portion 18 a that prevents co-rotation with the bend rubber 16 and the female screw portion 17 fitted into the lead screw 10. It is comprised with the bengal rubber | gum 19 provided with.

  Furthermore, the flange 22 provided with the rotating shaft through hole 21 with the protrusion 20 for stopping the rotation of the valve body 15 is integrated with the stator 23 by caulking or the like.

  The operation and action of the shut-off valve configured as described above will be described below.

  First, the rotor 12 is rotated by the current passed through the stator 23, and the notch 18 a of the flange portion 18 of the rubber bezel 19 into which the lead screw 10 of the rotating shaft 11 is inserted is caught on the protrusion of the flange 22, and the valve body 15 By stopping the co-rotation, the valve body 15 can be directly moved in the thrust direction.

  As described above, in the present embodiment, in order to stop the joint rotation of the valve body 15, the protrusion 20 is provided in the rotation shaft through hole 21 of the flange 22, and the protrusion 20 is notched in the flange portion 18 of the rubber band 19. As a result, the movement of the valve body 15 is converted into a linear motion. Therefore, by applying a rotational force to a rigidly unstable portion as in the prior art, the valve closing does not shift, You can change direction.

  Further, in the present embodiment, by providing a plurality of protrusions 20 of the rotary shaft through-hole 21 around the rotary shaft 11, no component force in the direction of tilting the rotary shaft 11 is applied when the rotary motion is received. Thus, it is possible to prevent the valve body 15 from shifting in the radial direction.

(Embodiment 2)
FIG. 3 is a perspective view of the flange and valve body of the shutoff valve according to the second embodiment of the present invention. In FIG. 3, reference numeral 24 denotes a non-circular rotary shaft through hole provided in the flange 25, and 27 denotes a rubber bezel having a flange portion 26 having substantially the same shape as the rotary shaft through hole 24. Is configured.

  The operation and action of the shut-off valve configured as described above will be described below.

  First, the rotation operation of the rotor 12 is transmitted to the valve body 28 through the rotary shaft 11. And since the flange part 26 of substantially the same shape has entered into the non-circular rotating shaft through hole 24 of the flange 25, the valve element 28 cannot be rotated and converted to a movement in the thrust direction.

  Further, in the present embodiment, it is possible to make the rotary shaft through hole 24 and the flange portion 26 of the rubber bezel 27 simple, and it is possible to make a structure with high rigidity and high reliability.

(Embodiment 3)
FIG. 4 is a perspective view of the flange and valve body of the shutoff valve according to the third embodiment of the present invention. In FIG. 4, reference numeral 29 denotes a rotation stop hole other than the rotation shaft through hole 31 of the flange 30, and is configured so that the protrusion 33 of the valve body 32 is fitted.

  The operation and action of the shut-off valve configured as described above will be described below.

  First, the rotating operation of the rotor 12 is transmitted to the valve body through the rotating shaft 11. Next, since the protrusion 33 of the valve body 32 enters the rotation stop hole 29 other than the rotation shaft through hole 31 of the flange 30, the valve body 32 cannot be rotated and is converted into a movement in the thrust direction. Become.

  As described above, since the shut-off valve according to the present invention has a structure in which the valve closing position and the valve opening position of the valve body are not inadvertently shifted, it is possible to improve the reliability of the valve closing, and therefore, other than gas. It can also be applied to other fluid shutoff valves.

Sectional drawing of the cutoff valve in Embodiment 1 of this invention The perspective view of the flange and valve body in Embodiment 1 of this invention The perspective view of the flange and valve body in Embodiment 2 of this invention The perspective view of the flange and valve body in Embodiment 3 of this invention Cross-sectional view of a conventional shut-off valve

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lead screw 11 Rotating shaft 12 Rotor 13 Bulkhead 14 Lid 15, 28, 32 Valve body 18, 26 Gutter part 18a Notch part 20 Protrusion 21, 24, 31 Rotating shaft through-hole 22, 25, 30 Flange 23 Stator 29 For rotation prevention hole

Claims (1)

A stator, a metallic partition disposed inside the stator, a rotor including a rotary shaft with a lead screw disposed inside the partition, and a female screw portion fitted into the lead screw Between the valve body having a notch portion for preventing co-rotation, a lid coaxially disposed at the open end of the partition wall and having a hole through which the rotating shaft can pass, and housing a bearing, and a flow path And a flange that separates the valve body and the stator from each other and has a sealing surface on the flange, and the flange restricts the rotational force when the valve body engages with the lead screw of the rotating shaft and performs a linear motion. A shut-off valve with a prevention structure.

Images