JPH0723666Y2 - Solenoid valve - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention excites by energizing a coil to adsorb a movable iron core to a fixed iron core so that a valve element is separated from a valve seat to open the valve. The present invention relates to an electromagnetic on-off valve in which a valve body is pressed together with a movable iron core to a valve seat side by a spring force when the valve is closed to close the valve. The present invention relates to an electromagnetic opening / closing valve for preventing the above.

Problems to be solved by the conventional technology and device In the conventional direct-acting electromagnetic on-off valve, the valve seat made of synthetic resin that easily fits with the valve seat is integrally fixed to the tip of the movable iron core. When the valve body comes into contact with the valve seat due to the urging force of the spring to close the valve seat, the weight of the movable iron core is applied to the valve body, causing the valve body to violently collide with the valve seat and easily be damaged. In the valve state, the valve element is pressed against the valve seat by the biasing force of the spring to cause a depression, but since there is a gap between the movable iron core and the sleeve that guides this, it hits another position each time the valve is closed. As a result, there is a problem that a gap is created between the valve body and the valve seat and the sealing property is deteriorated.

Means for Solving the Problems As a means for solving the above problems, the present invention provides a cylindrical body that communicates with an inflow port and that communicates with an outflow port so as to project from the cylindrical body. A non-magnetic sleeve is attached to the vacant chamber of the valve body with the valve seat formed on the front end surface, a coil with a fixed iron core fitted to one end is fitted to the sleeve, and it is slidably fitted into the sleeve. A device hole is formed in the projecting end of the movable iron core biased in the direction of projecting from the sleeve by the spring elastic force, and the valve element biased in the direction of contacting the valve seat by the spring elastic force is fitted into the device hole, and A stopper is attached to the projecting end of the movable iron core that abuts against the step formed on the outer circumference of the valve body to prevent the valve body from escaping. The structure is such that a mating fitting portion is formed.

Actions and Effects The present invention has the above-mentioned configuration, and when the coil is energized, the movable iron core is attracted toward the fixed iron core by excitation, and the stopper is locked to the step portion of the valve body and moves together with the movable iron core to open the valve.
In this state, when the coil is de-energized, the attraction force is released and the movable iron core moves toward the valve seat due to the biasing force of the spring. At this time, since the valve element is biased in the device hole in the direction of abutting the valve seat by the spring elasticity, the valve element abuts the valve seat during the movement of the movable iron core, and the spring is released after the movable iron core stops. Due to the elasticity, it abuts the valve seat and closes the valve. Therefore, the weight of the movable iron core does not act on the valve body,
It is elastically pressed against the valve seat to prevent damage due to a shocking abutment. In addition, since a fitting part is formed on the inner circumference of the stopper that fits closely to the outer circumference of the tip of the cylinder, the fitting part fits on the outer circumference of the tip of the cylinder when the valve is closed. Is determined, and the valve body abuts the valve seat at the same position every time.
Therefore, even if a depression is formed in the valve element, the valve element comes into contact with the valve seat at the position of the depression every time, and the sealing performance is secured.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 2 in the figure denotes a valve body in which an empty chamber 6 communicating with the inflow port 4 is formed, and a valve seat is provided at the tip of a cylindrical body 10 communicating with the outflow port 8.
12 are formed. A spacer 14 is fitted in the chamber 6 and a sleeve 16 made of a non-magnetic material is fitted around the spacer 14 to close the upper surface of the chamber 6 and is fixed to the valve body 2 by a screw body 17. . A fixed iron core 18 is fitted on the upper end of the sleeve 16, and a coil 20 is fitted on the outer side thereof. The movable iron core 22 is slidably fitted into the sleeve 16 and is pushed downward by the elasticity of the first coil spring 24, and is stopped at a position where the stopper 26 screwed to the lower end contacts the spacer 14. It is about to do. A guide cylinder 28 is fitted in the center of the movable iron core 22, and a spring bearing 30 is slidably fitted in the hollow of the movable core 22. The spring elasticity between the guide barrel 28 and the spring bearing 30 is the first coil spring 24. A larger second coil spring 32 is mounted. A valve body 36 made of synthetic resin is slidably fitted in a device hole 34 formed at the center of the lower surface of the movable iron core 22 and is pressed downward by a spring bearing 30 to be pressed against the valve seat 12. At the same time, the stepped portion 38 formed on the outer periphery abuts the stopper 26. Further, the inner circumference of the stopper 26 serves as a fitting portion 27 that is tightly fitted to the outer circumference of the upper end portion of the cylindrical body 10. A ring 40 is fitted around the stopper 26.

Next, the operation of this embodiment will be described. When the coil 20 is energized, the fixed iron core 18 and the movable iron core 22 are excited to move the movable iron core 22.
Is sucked by the fixed iron core 18 and the stopper 26 is hooked on the stepped portion 38 of the valve body 36 while the valve body 36 moves up.
By opening the valve away from the valve seat 12, the empty chamber 6 communicating with the inflow port 4 passes through the inside of the cylindrical body 10 and communicates with the outflow port 8. In this valve open state, as shown in FIG.
Is abutted on the stepped portion of the sleeve 16 to prevent the upper end of the movable iron core 22 from hitting the sleeve 16.

Next, when the coil 20 is de-energized, the fixed iron core 18 and the movable iron core 22 are de-excited, and the movable iron core 22 is pushed down by the elastic force of the first coil spring 24 and the fitting portion 27 of the stopper 26. Is fitted to the tip of the tubular body 10, and this serves as a guide, and the movable iron core 22 descends concentrically with the tubular body 10. Valve body 36 in the middle
Comes into contact with the valve seat 12, but the valve body 36 is pushed by the second coil spring 32 via the spring bearing 30, so that the weight of the movable iron core 22 does not act, and the valve body 36 does not move. To elastically abut and close the valve. After that, the movable iron core 22 further descends,
The stopper 26 separates from the stepped portion 38 of the valve body 36 and abuts on the spacer 14 to stop as shown in FIG. In this way, since the fitting portion 27 of the stopper 26 is fitted into the cylindrical body 10 to close the valve,
Even if there is a gap between the movable iron core 22 and the sleeve 16, the valve body
36 always comes into contact with the valve seat 12 at a fixed position, is pressed by the elastic force of the second coil spring 32 to form a recess at a fixed position, and since the contact is made at that position every time, the sealing performance does not deteriorate.

In order to facilitate the fitting of the stopper 26 and the tubular body 10,
The lower part of the fitting part 27 of the stopper 26 and the upper part of the fitting part of the tubular body 10 are tapered.

[Brief description of drawings]

FIG. 1 is a sectional view of a valve closed state according to an embodiment of the present invention, and FIG. 2 is a sectional view of the valve opened state. 2: Valve body, 4: Inlet, 6: Empty room, 8: Outlet, 10: Cylindrical body, 12:
Valve seat, 16: sleeve, 18: fixed iron core, 20: coil, 22: movable iron core, 24: first coil spring, 26: stopper, 27: fitting portion, 32: second coil spring, 34: device Hole, 36: Disc, 38: Step

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akiyuki Kobayashi 850 Horinouchi-cho, Kasugai-shi, Aichi Inside of C-day Controls Co., Ltd. (56) References 1-80884 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A non-magnetic sleeve is provided in the empty space of a valve body in which a cylindrical body communicating with the inflow opening communicates with the outflow opening and a valve seat is formed on the tip end surface of the cylindrical body. A coil, which is attached and has a fixed iron core fitted at one end, is fitted in the sleeve, is slidably fitted in the sleeve, and is attached to the protruding end of the movable iron core urged in the direction of protruding from the sleeve by spring elasticity. A device hole is formed, and a valve element is inserted into the device hole by a spring force in a direction of abutting against the valve seat, and the valve element comes out by abutting on a step formed on the outer periphery of the valve element. An electromagnetic on-off valve characterized in that a stopper for preventing the above is fixed to the projecting end of the movable iron core, and a fitting portion is formed on the inner circumference of the movable core so as to be fitted closely to the outer circumference of the tip end portion of the cylindrical body.