JP5888898B2 - On-off valve - Google Patents

Description

  The present invention relates to an on-off valve that opens and closes a flow path such as a gas pipeline.

  In the past, motor safety valves have been developed that can open and close the gas pipeline by electrical control during normal operation and can safely close the gas pipeline in the event of an abnormality such as a power failure (for example, Patent Document 1, Patent Document 1). 2). Such a motor safety valve generally includes a valve body that opens and closes a flow path, a spring that urges the valve body in a direction to close the flow path, an armature (movable magnetic body) connected to the valve body, and this armature. An electromagnet that can be attracted and a motor that drives the electromagnet forward and backward are provided. The flow path is opened when the electromagnet attracts the armature, and the position of the valve element is controlled by driving the motor to adjust the opening of the flow path. Further, in the event of an abnormality such as a power failure, the armature is attracted by the electromagnet and the flow path is closed by the valve element.

Japanese Utility Model Publication No. 63-126684 Japanese Patent No. 4420630

  The conventional motor safety valve has a structure in which an electromagnet moves by driving a motor. For this reason, the electromagnet lead wire must follow this movement and be able to be displaced without being caught. That is, there is a problem that a space in which the lead wire can move smoothly must be secured, and that the volume of the on-off valve is increased by that amount, and that the difficulty of arranging the lead wire is increased and the wiring cost of the lead wire is increased. .

  Further, in the above conventional motor safety valve, generally, the electromagnet holding member is slid along the sliding guide of the casing, and the electromagnet is supported so as to move along a fixed path. Wear powder is generated in the sliding portion. Therefore, if there is nothing to block from the sliding part to the adsorption surface of the electromagnet and the armature, the following problems arise. That is, when the armature is detached from the electromagnet, the abrasion powder falls on the adsorption surface of the armature due to the separation vibration, and the adsorption characteristics of the subsequent armature are deteriorated.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an on-off valve that does not require a space for moving an electromagnet conducting wire and can reduce the wiring cost of the conducting wire. .

In order to achieve the above-mentioned object, the invention according to claim 1 includes a casing having an opening of a flow path, a valve body that opens and closes the opening, an armature connected to the valve body, and electromagnetic force. An on-off valve comprising a core having an adsorption surface for adsorbing the armature, an electromagnetic coil for exciting the core, and a driving means for moving the core forward and backward toward the armature, wherein the electromagnetic coil is fixed Provided with a through hole in the center, the core is provided to be movable toward the armature through the through hole of the electromagnetic coil ,
The core is held by a holding member;
A gap is provided between the core and the through hole of the electromagnetic coil,
A sliding guide for slidably supporting the holding member is provided on the opposite side of the suction surface of the core;
The electromagnetic coil has the sliding guide and is fixed to a frame member fixed to a lid material fitted to the casing.
When the driving means is driven, the holding member slides along a sliding guide, and the core moves forward and backward toward the armature .

  In the first aspect of the present invention, the electromagnet core moves forward and backward toward the armature while the electromagnetic coil of the electromagnet is fixed, thereby attracting the armature and changing the position of the armature. Therefore, it is not necessary to secure a space for moving the conductive wire of the electromagnetic coil. Furthermore, the wiring work of the electromagnetic coil conductor is facilitated, and the wiring cost can be reduced.

Moreover , the core of the electromagnet moves forward and backward through a fixed path by sliding support of the sliding guide without rubbing against the electromagnetic coil. Therefore, even if wear powder is generated as the core moves forward and backward, the friction powder is generated not in the electromagnetic coil portion but in the sliding guide portion. And since this sliding guide is provided away from the opposite side of the adsorption surface of the core, it is possible to reduce the wear powder from falling on the adsorption surface of the armature due to the separation vibration of the armature.

The invention of claim 2 is the invention according to claim 1, before Kiho support member includes a shaft portion which slides along the sliding guide, and rotation is supported so as to be suppressed And an overhang part provided on the suction surface side from the shaft part, and the width of the overhang part is formed larger than the width of the sliding part.

In the second aspect of the invention, the overhanging portion is blocked in the middle of the space that extends from the sliding guide portion to the armature suction surface. Therefore, it is possible to prevent wear powder generated in the sliding guide portion from falling on the armature adsorption surface due to the armature's separation vibration.

  According to the present invention, the armature connected to the valve element can be adsorbed by the electromagnet, and the adsorbed armature can be moved forward and backward to adjust the opening of the flow path. Further, since the electromagnetic coil of the electromagnet is fixed, the space for moving the conducting wire of the electromagnetic coil can be eliminated, and further, the wiring work of the conducting wire is facilitated, and the wiring cost can be reduced.

It is a motor safety valve concerning an embodiment of the present invention, and is a longitudinal section. It is the longitudinal cross-sectional view showing the time of valve adsorption | suction in a motor safety valve. FIG. 3 is a longitudinal sectional view showing the motor safety valve when the valve is fully opened.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a motor safety valve (open / close valve) according to an embodiment of the present invention. The motor safety valve opens and closes the gas flow paths 11 and 12 in a state where the opening can be adjusted by electrical control, and can automatically close the gas flow paths 11 and 12 in the event of an abnormality such as a power failure. It can be done.

  The motor safety valve is provided in the casing 10 in which the flow paths 11 and 12 are formed, the lid member 30 to which each component is mounted and sealed in the casing 10, and the opening of the flow path 11. A valve body 50 that opens or closes the opening by contacting or separating from the valve seat 13, an armature 51 connected to the valve body 50 via a valve shaft 52, and urging the valve body 50 toward the valve seat 13 side. A spring 54, an electromagnet 40 capable of attracting the armature 51, and a motor (for example, a canned motor that does not generate a seal load) 20 as a driving unit that moves the core 41 of the electromagnet 40 forward and backward toward the armature 51 are provided. .

The lid member 30, the frame members 33 and 34 for supporting each part fixedly provided, the sliding guide 36 is provided for advancing and retracting movement on one of the frame member 34 to the valve shaft 52 at a fixed path, while An electromagnetic coil 42 described later is fixed to the frame member 33.

  The electromagnet 40 includes an electromagnetic coil 42 that generates an electromagnetic force, and a core 41 that generates an electromagnetic force through a magnetic flux generated by the electromagnetic coil 42. The electromagnetic coil 42 is formed by winding a conducting wire around a cylindrical bobbin having a through hole in the center, and is fixed to a fixed frame member 33. The conducting wire of the electromagnetic coil 42 is connected to the external control circuit 101 via the lead wire 43.

  The core 41 is made of a magnetic material, and has a U shape, for example, and a part thereof is passed through the bobbin through hole of the electromagnetic coil 42. In the core 41, the end surface on the armature 51 side is set as the attracting surface 41a, and when the electromagnetic force is generated, the end surface (surface to be attracted) 51a of the armature 51 is attracted. A gap is provided between the core 41 and the through hole of the electromagnetic coil 42 so that the core 41 does not come into contact with the armature 51 when it moves forward and backward. The core 41 is held by a holding member 45 at a portion opposite to the suction surface 41a.

  The holding member 45 has a linear shaft part 45a having a thread and a projecting part 45b formed so as to project wider than the shaft part 45a. The overhanging portion 45b is formed wider than the shaft portion 45a in the entire circumferential direction of the shaft portion 45a. The shaft portion 45 a is disposed on the opposite side of the suction surface 41 a of the core 41, and the overhang portion 45 b is disposed in the middle of the path leading from the shaft portion 45 a to the suction surface 41 a of the core 41.

  The lid member 30 is provided with a sliding guide 32 that slides the shaft portion 45a of the holding member 45 and supports the shaft portion 45a so as to advance and retreat toward the armature 51. The shaft portion 45a is supported by the sliding guide 32 so that the shaft portion 45a can move forward and backward, and is prevented from rotating. The rotating shaft 21 of the motor 20 having a male screw is screwed into the thread of the shaft portion 45a. With such a configuration, the holding member 45 slides along the sliding guide 32 when the motor 20 is driven to rotate, and the core 41 moves forward and backward toward the armature 51.

  FIG. 2 is a longitudinal sectional view showing when the motor safety valve according to the present embodiment is adsorbed, and FIG. 3 is a longitudinal sectional view showing when the motor safety valve is fully opened. In the motor safety valve configured as described above, as shown in FIG. 2, current is passed through the electromagnetic coil 42 in a state where the core 41 of the electromagnet 40 is lowered to a position where it contacts the armature 51 by driving the motor 20. . As a result, the armature 51 is adsorbed to the core 41. At this time, since a closed magnetic circuit is formed by the U-shaped core 41 and the armature 51, leakage of magnetic flux is reduced, and a strong attracting force is efficiently obtained.

  As shown in FIG. 3, in this state, the motor 20 is driven and the core 41 of the electromagnet 40 is raised, so that the valve body 50 is separated from the valve seat 13 and the flow path 11 is opened. FIG. 3 shows the flow path 11 fully opened, but the distance (opening) between the valve body 50 and the valve seat 13 can be arbitrarily adjusted by controlling the drive amount of the motor 20.

  In the motor safety valve according to the present embodiment, as described above, when the armature 51 is moved, the core 41 is moved while the electromagnetic coil 42 of the electromagnet 40 is fixed. Therefore, the lead wire 43 of the electromagnet 40 is not displaced, and it is not necessary to secure the movement space, and the wiring cost of the lead wire 43 can be reduced. Further, when the armature 51 is moved, it is not necessary to move the electromagnetic coil 42. Therefore, the load on the motor 20 can be reduced correspondingly, and the power consumption can be reduced.

  In the motor safety valve according to the present embodiment, when an abnormality such as a power failure occurs while the flow path is open, the current flowing through the electromagnet 40 is stopped and the electromagnetic force is released. Then, as shown in FIG. 1, the armature 51 is detached from the core 41, and the valve body 50 is pressed against the valve seat 13 by the biasing force of the spring 54, so that the flow path is safely closed.

  At this time, generally, the vibration of the valve body 50 is generated in the core 41, and the abrasion powder generated in the portion of the sliding guide 32 may be shaken off. However, in the motor safety valve according to the present embodiment, the sliding guide 32 is provided on the opposite side of the armature 51, and the overhanging portion 45b of the holding member 45 blocks the space between them. This prevents the wear powder from falling on the armature 51. Therefore, it is possible to avoid adverse effects on the subsequent adsorption action of the armature 51.

  In the above-described embodiment, the motor 20 is shown as the driving means for moving the core 41. However, various driving means such as a solenoid actuator may be applied. Further, the shape of the core and the arrangement of the electromagnetic coils can be variously changed. The core holding member may be integrated with the core. Moreover, although the example which applied this invention to the motor safety valve which opens and closes the flow path of gas was shown in the said embodiment, the fluid by which a flow is controlled by an on-off valve is not restrict | limited to gas.

DESCRIPTION OF SYMBOLS 10 Casing 11,12 Flow path 13 Valve seat 20 Motor (drive means)
21 Rotating shaft 30 Lid material 32 Sliding guide 33, 34 Frame member 40 Electromagnet 41 Core 41a Adsorption surface 42 Electromagnetic coil 45 Holding member 45a Shaft (sliding part)
45b Overhang part (overhang part)
50 Valve body 51 Armature 52 Valve shaft 54 Spring

Claims (2)

A casing having an opening of a flow path, a valve body for opening and closing the opening, an armature connected to the valve body, a core having an adsorption surface for adsorbing the armature by electromagnetic force, and exciting the core In an on-off valve comprising an electromagnetic coil for driving and a driving means for moving the core forward and backward toward the armature,
The electromagnetic coil is fixedly provided and has a through hole in the center,
The core is provided to be movable toward the armature through the through hole of the electromagnetic coil ,
The core is held by a holding member;
A gap is provided between the core and the through hole of the electromagnetic coil,
A sliding guide for slidably supporting the holding member is provided on the opposite side of the suction surface of the core;
The electromagnetic coil has the sliding guide and is fixed to a frame member fixed to a lid material fitted to the casing.
The on-off valve is characterized in that when the driving means is driven, the holding member slides along a sliding guide, and the core moves forward and backward toward the armature . Before Kiho support member slides along the sliding guide, and a shaft portion supported such that the rotation is prevented, and a projecting portion the provided suction surface side of the shaft portion Have
The on-off valve according to claim 1 , wherein a width of the overhanging portion is formed larger than a width of the sliding portion.

Images