JPH083791Y2 - solenoid valve - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve.

[0002]

2. Description of the Related Art A bobbin around which a coil is wound, a fixed iron core mounted in a center hole of the bobbin, a magnetic frame and a magnetic plate surrounding the bobbin,
A movable iron core slidably inserted into the center hole of the bobbin and the magnetic plate, and a solenoid portion having a return spring for the movable iron core, a plurality of ports, a valve seat in a passage communicating these ports, and the movable iron core. A solenoid valve including a valve portion having a valve body that opens and closes the valve seat is already known without needing a specific example. However, the known solenoid valve has a problem that the movable iron core collides with the fixed iron core, so that the iron core is greatly worn and the life of the solenoid portion is short.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a solenoid valve which prevents wear due to collision between iron cores by utilizing a seal member for sealing a coil.

[0004]

In order to solve the above-mentioned problems, the present invention provides a bobbin around which a coil is wound, a fixed iron core mounted in a central hole of the bobbin, a magnetic frame and a magnetic plate surrounding the bobbin,
A movable iron core slidably inserted into the center hole of the bobbin and the magnetic plate, and a solenoid portion having a return spring thereof, a plurality of ports, a valve seat in a passage communicating these ports, and driven by the movable iron core. In a solenoid valve including a valve portion having a valve body that opens and closes the valve seat, an annular seal member that seals a coil formed of an elastic material is provided between the bobbin and the magnetic plate, It is characterized in that the iron core is provided with expanded diameter portions facing the center hole of the magnetic plate and the valve portion side surface of the seal member, respectively, and the distance between the seal member and the expanded diameter portion is smaller than the stroke of the movable iron core. I am trying.

[0005]

[Function] When the coil is energized, the fixed iron core attracts the movable iron core. When the coil is de-energized, the movable iron core returns to its original state, and the valve body opens and closes the valve seat. In this case, the distance between the seal member that seals the coil and the expanded portion of the movable iron core is smaller than the stroke of the movable iron core, so wear due to collision between the iron cores can be prevented, and the movable iron core becomes a fixed iron core. Since it is not adsorbed, it has a good recovery response.
In addition, since the expanded core of the movable iron core and the seal member that seals the coil prevent the iron cores from colliding with each other, these fluctuations are not affected by the slow switching speed of the solenoid valve and the high and low fluid pressure. Even if there is, the cores can be reliably prevented from colliding with each other. Further, since the expanded diameter portion of the movable iron core faces the center hole of the magnetic plate, the magnetic resistance between them is reduced, so that the electromagnetic force can be increased.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the present invention.
The solenoid unit 1 and the valve unit 2 are provided, and these are integrally connected by appropriate means (not shown). The solenoid part 1 includes a bobbin 5 around which a coil 4 is wound, a fixed iron core 6 which is airtightly mounted in a central hole of the bobbin 5, a magnetic frame 7 and a magnetic plate 8 which surround these, a central hole of the bobbin 5 and a larger diameter A movable iron core 9 slidably inserted into the center hole of the magnetic plate 8 and a return spring 10 thereof, and a synthetic resin or the like for sealing the coil 4 between the bobbin 5 and the magnetic plate 8. An annular seal member 11 formed of an elastic material and having a central hole of substantially the same diameter as the central hole of the bobbin 5 is attached. On the other hand, the valve main body 13 of the valve portion 2 is provided with a pressure fluid input port P, an output port A, a discharge port R, and a passage connecting these ports, which are formed so as to face each other, and which is provided between the ports P and A. The valve seat 14 and the exhaust valve seat 15 between the ports A and R, the supply valve chamber 16 and the exhaust valve chamber 17 which are substantially concentric with these valve seats, and the communication hole 1 for communicating the valve chambers 16 and 17 with each other.
., And an O-ring 19 is attached to the surface facing the solenoid section 1.

The movable core 9 has a diameter slightly smaller than that of the center hole of the magnetic plate 8 and an enlarged diameter portion 21 facing the center hole and the valve portion side surface of the seal member 11, and the enlarged diameter portion 21. .. and a recess 22 at the tip of the valve portion, and the distance between the seal member 11 and the expanded diameter portion 21 is the distance between the fixed iron core 6 and the movable iron core 9. If so, the stroke is made slightly smaller than the stroke of the movable iron core 9, and the cap 23 formed of an elastic material is attached to the reduced diameter portion 9a on the valve portion 2 side. Supply valve body 2 for opening and closing supply valve seat 14
Reference numeral 4 is slidably inserted into the recess 22 and is biased in a direction of closing the supply valve seat 14 by a first valve spring 25 that is contracted between the recess 22 and the bottom surface of the recess 22. It is locked to 23a and is prevented from jumping out from the concave portion 22.

A discharge valve body 27 for opening and closing the discharge valve seat 15
Is urged in the direction of closing the discharge valve seat 15 by the second valve spring 29 that is contracted between the discharge valve body 2 and the spring seat 28.
The tip of the pressing member 30 that drives 7 has a communication hole 18, ...
It is in contact with the locking portion 23a through the. Reference numeral 32 in the figure
Is a manual operation button that opens the supply valve seat 14 by pressing
Reference numeral 3 is a wiring board for supplying power to the coil 4, and is provided with electric / electronic parts 34, ... Such as a resistor and a back electromotive force preventer necessary for controlling the solenoid.

In the above embodiment, when the solenoid portion 1 is assembled, the seal member 11 is sandwiched between the bobbin 5 and the magnetic plate 8 and the valve portion 2 is airtightly assembled to the solenoid portion 1 by the seal ring 19.

When the coil 4 is not energized, the first valve spring 2
The supply valve body 24 closes the supply valve seat 14 by the urging force of 5, and the discharge valve body 27 pressed by the pressing member 30 opens the discharge valve seat 15, so that the ports A and R are in communication (FIG. (See 1 left half). When the coil 4 is energized, the fixed iron core 6 attracts the movable iron core 9 against the urging force of the return spring 10, so that the supply valve body 24 opens the supply valve seat 14 and
The discharge valve body 27 closes the discharge valve seat 15 by the urging force of the second valve spring 29, and the ports P and A communicate (see the right half of FIG. 1). In this case, since the distance between the expanded diameter portion 21 of the movable iron core 9 and the valve portion side of the seal member 11 is slightly smaller than the stroke of the movable iron core 9, the expanded diameter portion 21 and the seal member 11 come into contact with each other to move. Since the iron core 9 does not collide with the fixed iron core 6,
The wear due to the collision between the movable core 9 and the fixed core 6 can be prevented, and the life of the solenoid valve can be extended. In addition, the movable iron core 9
The mutual collision preventing means composed of the expanded diameter portion 21 and the seal member 11 of the coil 4 is not affected by the slow switching speed of the solenoid valve and the high or low of the fluid pressure. The collision of the iron core can be reliably prevented. Further, since the expanded diameter portion 21 of the movable iron core 9 faces the large-diameter center hole of the magnetic plate 8, the magnetic resistance between them is reduced and the electromagnetic force can be increased.

When the coil 4 is de-energized, the return spring 1
By the biasing force of 0, the movable iron core 9 returns to the original state.
In this case, the movable iron core 9 is not attracted to the fixed iron core 6, so that the return response is good.

Although the above embodiment is a 3-port valve,
The solenoid valve of the present invention is not limited to this, and may be any one having a plurality of ports.

[0013]

The solenoid valve of the present invention prevents the cores from colliding with each other by the seal member for sealing the coil and the expanded portion of the movable core, so that the wear of the cores is reduced and the service life of the solenoid valve is extended. The responsiveness when returning to the movable iron core is good. Further, since there is no influence of the slow switching speed of the solenoid valve and the high or low of the fluid pressure, it is possible not only to reliably prevent the collision of the iron core but also to increase the electromagnetic force even if there is such variation.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an embodiment.

[Explanation of symbols]

 1 Solenoid part 2 Valve part 4 Coil 5 Bobbin 6 Fixed iron core 7 Magnetic frame 8 Magnetic plate 9 Movable iron core 10 Return spring 11 Sealing member 14 Supply valve seat 21 Expanding part 24 Supply valve body P, A, R ports

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Takumi Matsumoto 4-2-2 Kinnodai, Taniwahara-mura, Tsukuba-gun, Ibaraki SMC Tsukuba Technical Center (56) Reference JP-A-62-115585 (JP, A) Actual opening 2-143580 (JP, U) Actual opening Sho 63-89478 (JP, U) Actual opening 3-98381 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A bobbin around which a coil is wound, a fixed iron core mounted in a center hole of the bobbin, a magnetic frame and a magnetic plate surrounding the core,
A movable iron core slidably inserted into the center hole of the bobbin and the magnetic plate, and a solenoid portion having a return spring thereof, a plurality of ports, a valve seat in a passage communicating these ports, and driven by the movable iron core. In a solenoid valve including a valve portion having a valve body that opens and closes the valve seat, an annular seal member that seals a coil formed of an elastic material is provided between the bobbin and the magnetic plate, In the iron core, expanded diameter portions facing the central hole of the magnetic plate and the surface of the seal member on the valve portion side are provided, respectively, and the distance between the seal member and the expanded diameter portion is made smaller than the stroke of the movable iron core. Characteristic solenoid valve.