JPH0623806Y2 - Solenoid valve - Google Patents

Description

Detailed Description of the Invention A. Purpose of the Invention (1) Field of Industrial Use The present invention is characterized in that a valve chamber is formed between a fixed core and a yoke that are mutually coupled to form a housing, and the valve chamber is
The movable core is housed so as to be able to move toward and away from the fixed core, and a return spring that exerts a spring force in a direction to separate the movable core from the fixed core is interposed between the fixed core and the movable core. A solenoid valve in which a valve hole is provided facing one side of the valve chamber, and a valve body capable of opening and closing the valve hole is floatingly supported between the movable core and a retainer fixed to the movable core. Regarding the valve.

(2) Conventional technology Conventionally, a movable core is housed in a valve chamber between a fixed core and a yoke while being biased by a spring in a direction away from the fixed core, and a valve provided on either side of the fixed core and the yoke. A solenoid valve in which a valve body capable of opening and closing a hole is provided in a movable core is already known, for example, from Japanese Patent Laid-Open No. 63-318379.

(3) Problems to be Solved by the Invention By the way, in the above-mentioned conventional one, it is possible to move a relatively large diameter movable core in the axial direction while guiding it on the side surface of the valve chamber, and to make a spherical shape at the center of one end side of the movable core. The valve body of is fixed. However, according to such a configuration, if the valve body is not exactly aligned with the axis of the valve hole, the seating sealability at the time of valve closing will be poor. That is, it is preferable that the gap between the outer surface of the movable core and the side surface of the valve chamber is small in order to reliably guide the axial movement of the movable core, but then, the tilt allowable amount in the valve chamber of the movable core having a relatively large diameter is reduced. This is extremely limited, and the seat sealability may be impaired unless strict control of the dimensions is performed.

Therefore, there has already been proposed a solenoid valve that solves the above problems by floatingly supporting a valve element between a movable core and a retainer fixed to the movable core. On the other hand, in order to prevent the residual magnetism due to direct contact between the fixed core and the movable core from adversely affecting the operation of the movable core, in the above-mentioned conventional one (Japanese Patent Laid-Open No. 63-318379), A spacer made of a non-magnetic material is interposed between the movable core and the fixed core during the adsorption operation to the fixed core side. If the retainer also functions as the spacer, it is possible to reduce the number of parts and solve the problem of seating sealability and avoid the adverse effect of residual magnetism.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a solenoid valve capable of improving seating sealability while reducing the number of parts and eliminating the adverse effect of residual magnetism. .

B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above object, according to a first feature of the present invention, a retainer is made of a non-magnetic material and an end surface of the movable core facing the fixed core. Is fixed to the movable core by projecting at least a part thereof toward the fixed core.

According to the second aspect of the present invention, the retainer is provided with a plurality of protrusions protruding toward the fixed core.

(2) Action According to the configuration of the first feature described above, the retainer made of a non-magnetic material comes into contact with the fixed core, and the residual magnetism due to the direct contact between the fixed core and the movable core causes It is possible to avoid adversely affecting the operation.

Further, according to the configuration of the above-mentioned second feature, only a plurality of protrusions of the retainer come into contact with the fixed core, so that the contact area of the retainer with the fixed core can be made relatively small.

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

First, referring to FIG. 1, the housing 1 of this solenoid valve is shown.
The fixed core 2 and the yoke 3 facing the fixed core 2 are coupled to each other. The fixed core 2 has a disc portion 2a.
A short cylindrical portion 2b extending slightly inward in the axial direction from the outer edge of the disc portion 2a, and the short cylindrical portion extending inward in the axial direction from the center of the inner surface of the disc portion 2a. Two
b has an inner shaft portion 2c that extends for a long time, and an outer shaft portion 2d that has a larger diameter than the inner shaft portion 2c and that projects outward from the center of the outer surface of the disk portion 2a in the axial direction. . Also York 3
Is a disc portion 3a facing the disc portion 2a of the fixed core 2.
And a cylindrical portion 3b extending inward in the axial direction from the outer edge of the disk portion 3a, and a shaft portion 3c protruding outward from the center of the outer surface of the disk portion 3a in the axial direction. Thus, the fixed core 2 and the yoke 3 are such that the tip of the cylindrical portion 3b is the disc portion 2
They are connected to each other while being brought into contact with the outer edge of the inner surface of a.

On the inner side of the cylindrical portion 3b, between the short cylindrical portion 3b of the fixed core 2 and the disk portion 3a of the yoke 3, a cylindrical body 4 made of a non-magnetic material and a basically ring-shaped guide member 5 are fixed. An annular seal member 6 that is provided in order from the core 2 side and is in contact with the outer surface of the cylindrical portion 3b is fitted on the outer surface of the cylindrical body 4. A flange portion 4a is provided at the end of the cylindrical body 4 on the side of the yoke 3 so as to extend inward in the radial direction. An annular seal member 7 that contacts the inner end of the flange portion 4a over the entire circumference is fixed core. It is fitted on the outer surface of the front end portion of the inner shaft portion 2c in FIG. Thus, an annular space is formed by the disk portion 2a, the cylindrical body 4 and the inner shaft portion 2c, and the solenoid 9 wound around the bobbin 8 surrounds the base end portion of the inner shaft portion 2c in the space. Are arranged.

By the way, the housing 1 is sandwiched between the first case 11 and the second case 12 which are coupled to each other, and the outer shaft portion 2d of the fixed core 2 is attached to the first case 11 via the annular seal member 13. The shaft portion 3c of the yoke 3 is fitted into the second case 12 via the annular seal member 14. Thus, the outer shaft portion 2 of the fixed core 2 is provided in the first case 11.
The entrance passage 15 is provided coaxially with the second case 12 and
An outlet passage 16 is formed coaxially with the inlet passage 15.

In the housing 1, the fixed core 2, the cylindrical body 4,
A valve chamber 17 is defined by the guide member 5 and the yoke 3, and a movable core 18, which is basically cylindrical, is housed in the valve chamber 17, and the movable core 18 and the fixed core 2 are formed.
A return spring 19 that elastically urges the movable core 18 toward the yoke 3 side is provided between the two.

The fixed core 2 is coaxially provided with an inlet passage 20 for communicating the inlet passage 15 with the valve chamber 17.
A filter 21 is arranged at the outer end of the. Further, an enlarged diameter portion 20a is provided at an inner end portion of the inlet flow path 20 via a step portion 20b, and the return spring 19 is accommodated in the enlarged diameter portion 20a such that one end thereof is received by the step portion 20b. It

The fixed core 2 is coaxially provided with an outlet passage 22 for communicating the valve chamber 17 with the outlet passage 16.
At the inner end of 2, the valve seat member 23 whose front end faces the valve chamber 17
Are press-fitted and fixed via the seal member 24. The valve seat member 23 is basically formed in a bottomed cylindrical shape with the closed end as the closed end, and a valve hole 25 communicating with the outlet flow passage 22 is formed at the center of the closed end. It

The guide member 5 is basically formed in a ring shape, but on its inner surface, a protrusion 27 that projects radially inward is provided over the entire circumference, and the protrusion 27 has a plurality of protrusions 27. Holes 26 are drilled. The movable core 18 is arranged in the guide member 5 while having an outer diameter slightly smaller than the inner peripheral edge diameter of the protrusion 27 and being basically formed in a ring shape.
Moreover, the ring-shaped metal diaphragms 28, 2 having a plurality of holes between the guide member 5 and the movable core 18 are formed.
8 are respectively stretched, and these diaphragms 2
The axis of the movable core 18 is held coaxially with the axis of the guide member 5 by 8, 28.

In the center of the movable core 18, there is coaxially formed a through hole 34 having a support flange 33 extending inward in the radial direction on the inner surface of the intermediate portion, and is basically formed in a ring shape by a non-magnetic material. The retainer 31 is press-fitted and fixed to the end of the through hole 34 on the fixed core 2 side. Thus, the support collar 33 and the retainer 31
A valve body 30 capable of opening and closing the valve hole 25 is held between and. That is, the valve body 30 is provided with a shaft portion 30a that gently penetrates the retainer 31 and the support collar 33, and the shaft portion 30a so as to be arranged between the support collar 33 and the retainer 31 while allowing a slight movement in the axial direction. The movable core 18 is composed of a flange portion 30b extending outward in the radial direction and a valve body portion 30c formed by fixing a sphere to the tip of the shaft portion 30a, while allowing a slight displacement in the radial direction and the axial direction.
And it will be held between the retainers 31. Moreover, the shaft portion 30a of the valve body 30 is provided with a communication hole 35 that communicates the portions of the valve chamber 17 facing both axial end surfaces of the movable core 18.

In FIG. 2, a retainer 31 is attached to a fixed core 2 side on a ring-shaped base 31 a that is flush with the fixed core 2 side end surface of the movable core 18 in a state of being press-fitted into the through hole 34 of the movable core 18. A plurality of, for example, four protrusions 31b are provided so as to project toward each, and each protrusion 31b is arranged, for example, in a substantially cross shape. The other end of the return spring 19 whose one end is received by the step portion 20b is received by the retainer 31.

Next, the operation of this embodiment will be described. When the solenoid 9 is demagnetized, the movable core 18 is in the position shown in FIG. 1 by the spring force of the return spring 19, and the valve hole 30 is closed by the valve body 30. In this state, the valve element 30 is floatingly supported by the movable core 18 and the retainer 31 and is allowed to move relative to the movable core 18 within a limited range in the axial direction and the radial direction. Even if the relative position dimension of 18 and the valve hole 25 is not strictly controlled, the valve hole 30 can be securely closed by the valve body 30,
It is possible to improve the seating sealability when the valve is closed.

When the solenoid 9 is excited, the movable core 18 is attracted to the fixed core 2 side against the spring force of the return spring 19 until the retainer 31 abuts, and the valve body 30 opens the valve hole 25. At this time, the retainer 31 does not contact the fixed core 2 over the entire circumference thereof, but the plurality of protrusions 31 b contact the fixed core 2, so that the contact area of the retainer 31 with the fixed core 2 is relatively small.

By the way, when the solenoid 9 is demagnetized, the retainer 31 contacts the fixed core 2, so that the pressure receiving area of the movable core 18 on the side facing the fixed core 2 is substantially smaller than the pressure receiving area on the side facing the yoke 3. However, since the contact area of the retainer 31 to the fixed core 2 is relatively small, the substantial pressure receiving area difference is relatively small, and therefore the solenoid 9
When is switched from the excited state to the demagnetized state, the fluid pressure acting on the movable core 18 toward the fixed core 2 side is suppressed to a relatively low level, and the solenoid 9 is demagnetized to move the movable core 18 or the valve body 30. It is possible to reduce the delay of the valve closing operation and improve the operation response. Moreover, the valve chamber 17 and the inlet passage 20 are not blocked by the retainer 31 over the entire circumference when the movable core 18 is adsorbed to the fixed core 2 side, and the valve chamber 17 and the inlet passage 20 are not blocked.
Since fluid flow between the protrusions 31b is allowed, a large fluid resistance does not act on the movable core 18 immediately before the retainer 31 contacts the fixed core 2, and the movable core 18 when the solenoid 9 is excited. That is, it is possible to reduce the delay in the valve opening operation of the valve body 30 and improve the operation response.

C. As described above, according to the first feature of the present invention, the retainer is made of a non-magnetic material, and at least a part of the retainer projects from the end surface of the movable core facing the fixed core toward the fixed core side. Since it is fixed to the retainer, a retainer for holding the valve body between the movable core and the seating seal is improved,
The number of parts can be reduced by using it as a member for avoiding an adverse effect on the operation due to residual magnetism.

Further, according to the second feature of the present invention, the retainer is provided with a plurality of protrusions protruding toward the fixed core, so that the contact area of the retainer with the fixed core is relatively small and the operation response is improved. can do.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 1 is a longitudinal sectional view of the solenoid valve, and FIG. 2 is an enlarged perspective view of the retainer. 1 ... Housing, 2 ... Fixed core, 3 ... Yoke, 1
7 ... Valve chamber, 18 ... movable core, 19 ... return spring, 2
5 ... Valve hole, 30 ... Valve body, 31 ... Retainer, 31b
...... Projection

Claims (2)

[Scope of utility model registration request] 1. A valve chamber (1) between a fixed core (2) and a yoke (3) which are connected to each other to form a housing (1).
7) is formed, and the movable core (18) is housed in the valve chamber (17) so that the movable core (18) can be moved toward and away from the fixed core (2), and the movable core (18) is fixed to the fixed core (2). A return spring (19) that exerts a spring force in the direction of moving away from is provided between the fixed core (2) and the movable core (18), and on either side of the fixed core (2) and the yoke (3). A valve hole (25) is provided facing the valve chamber (17), and a valve body (30) capable of opening and closing the valve hole (25) is
In a solenoid valve floatingly supported between the movable core (18) and a retainer (31) fixed to the movable core (18), the retainer (31) is made of a non-magnetic material and the movable core (18). (3) is fixed to the movable core (18) by projecting at least a part of the end surface facing the fixed core (2) toward the fixed core (2). 2. The solenoid valve according to claim 1, wherein the retainer (31) is provided with a plurality of protrusions (31b) protruding toward the fixed core (2).