JPH053828Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a solenoid valve that controls the flow of fluid, for example, and in particular a frame located on the outer periphery of the solenoid valve and a coil inserted into the frame. This relates to a seal structure between the turned bobbin unit.

(Prior Art) As a conventional solenoid valve of this type, there is one shown in FIG. 3, for example. That is, a hole 102 is formed in the center of a bottom portion 101 of a bottomed cylindrical frame 100 located on the outer periphery of the solenoid valve. The bobbin unit 103 is inserted in the axial direction from the open end side. This bobbin unit 103 includes a bobbin 104
A coil 105 is wound around the outer circumference, and a plunger 106 movable in the axial direction is housed in the center of the interior.

On the other hand, a center post 107 is fixed through the hole 102 of the frame bottom 101 . The center post 107 is located in the small hole 102 of the frame 100.
An O-ring 108 is provided to seal the penetration. This O-ring 108 is provided between the bobbin unit 103 and the inner surface of the bottom portion 101 of the frame 100. When assembling the bobbin unit 103, the opening of the frame 100 is covered with the plate 109, and the opening 110 is covered with the plate 109.
It is assembled and fixed by caulking. and,
The O-ring 108 is pressed by this caulking load (FIG. 4), and sealing is performed.

(Problems to be Solved by the Invention) However, according to the above-mentioned prior art, the end face of the bobbin unit 103 may not come into full contact with the frame bottom 101 but may come into partial contact, as shown in FIG. 5, for example. If there is uneven contact in this way, the caulking load will not be applied uniformly in the circumferential direction of the O-ring 108, and the crushing rate when the O-ring 108 is pressed, crushed, and deformed will not be constant, and the seal will not be completely formed. There was a problem that there was no.

In addition, if there are variations in the dimensions of the bobbin unit 103, it may be necessary for the bobbin unit 103 to be pressed and deformed in the axial direction to cause relief when a caulking load is applied in the axial direction. In this case, there was a problem in that the resistance of the bobbin unit 103 became excessive, and the deformation was not successful (see FIG. 3), resulting in an increased caulking load.

This invention was made in view of the above problems, and aims to provide a solenoid valve in which the crushing rate of the seal member in the circumferential direction is constant and the caulking load is small.

(Means for Solving the Problem) A bobbin unit having a coil wound thereon is housed in a cylindrical frame with a bottom so that the inner periphery of the bobbin unit, on which a coil is wound, is inserted into a center post that is fixed through the bottom of the frame, and the frame opening is closed. A solenoid that assembles and fixes the bobbin unit to the frame by caulking, and also attaches an annular seal member to the penetrating portion of the center post at the bottom of the frame, and crushes the seal member between the bobbin unit and the bottom of the frame for sealing. The valve is characterized in that a plurality of protrusions are provided along the circumferential direction at a portion of the bobbin unit that comes into contact with the bottom of the frame.

(Function) At the contact part of the bobbin unit with the bottom of the frame,
Since the protrusion is provided, if the bobbin unit comes into partial contact with the bottom of the frame when the bobbin unit is inserted, the bobbin unit is pushed by the protrusion that comes into contact with the bottom of the frame, thereby preventing the uneven contact. This makes the crushing rate of the seal member uniform in the circumferential direction.

On the other hand, even if the dimensions of the bobbin unit vary and are longer than a predetermined dimension, the dimensional error is absorbed by the gap between the protrusion and the bottom of the frame.

(Example) An example of the solenoid valve of this invention will be described below with reference to FIGS. 1 and 2.

A frame 1 having a generally bottomed cylindrical shape is located around the outer periphery of the solenoid valve. Bottom 2 of this frame 1
A center post 9 is fixed through the central hole 3 of the frame 1 in the direction of the central axis of the frame 1 .

On the other hand, a bobbin unit 4 in which a coil 6 is wound around a bobbin 5 is inserted through the opening of the frame 1, and the frame 1 and the bobbin unit 4 are assembled together by caulking at the opening end.

The bobbin 5 is made of resin, and flanges 8A and 8B for fixing coils are integrally provided at both ends thereof. The entire bobbin 5 has a generally cylindrical shape, and a center post 9 is inserted into the inner periphery of the bobbin 5, so that one end of the bobbin 5 is closed. A plunger 7 is housed inside the closed bobbin 5. This plunger 7 is movable in the axial direction, and is biased toward the left in the figure by a coil spring 12 provided on the center post 9.

On the other hand, in the penetrating portion of the center post 9 fixed to the frame bottom 2, an O2 as a sealing member is provided.
A ring 10 is attached. i.e. bobbin 5
The outer surface of the flange 8A on the insertion tip side is inclined toward the inner peripheral side, and the O-ring 10 is located in this inclined portion 13.

After the bobbin unit 4 is inserted into the frame 1, an annular plate 11 closes between the outer periphery of the bobbin 5 and the frame 1 at the other end of the frame 1. At this time, the plate 11 is caulked against the frame 1, and this caulking load is transmitted in the axial direction and presses the O-ring 10.

This pressing is performed between the outer surface of the flange 8A and the inner surface of the bottom portion 2 of the frame 1. A protrusion 14 is provided on the outer side of the inclined portion 13 at the portion of the outer surface of the flange 8A that comes into contact with the frame bottom portion 2.

A plurality of protrusions 14 are provided to protrude along the circumferential direction. In this embodiment, the protrusion 14 is made of synthetic resin and is integrally molded with the bobbin 5, but it may be attached as a separate member by adhesive or the like. Also, protrusion 1
The number of 4 is arbitrary, and it is desirable to arrange them evenly.

In the solenoid valve having the above structure, when the bobbin unit 4 is assembled, even if the flange 8A of the bobbin unit 4 comes into partial contact with the frame bottom 2 as shown in FIG. The bobbin unit 4 comes into contact with the bottom 2, and its reaction force acts to push back the bobbin unit 4, thereby preventing uneven contact.

Therefore, the bobbin unit 4 and the frame bottom 2
The intervals between the O-rings 10 and 10 become uniform in the circumferential direction, and the crushing margin of the O-ring 10 can be made uniform.

On the other hand, if the length of the bobbin unit 4 is long due to dimensional variations between the bobbin unit 4 and the frame 1, the dimensional error is absorbed by the axial deflection of the flange 8A of the bobbin unit 4.
In this embodiment, by providing the protrusion 14 on the flange 8A of the bobbin unit 4, a gap is formed between the flange 8A and the frame bottom 2. This gap makes the flange 8A easy to bend, and prevents the caulking load from becoming excessive during assembly. In particular, in this embodiment, the bobbin unit 4
is made of resin and is easy to bend, making it possible to further reduce the caulking load.

The operation of the solenoid valve itself of this embodiment will be explained as follows. When a current flows through the coil 6, magnetic lines of force are generated around the coil 6. These lines of magnetic force pass through the metal frame 1, plate 11, plunger 5, and center post 9 to form a magnetic path. By forming this magnetic path, the plunger 7 moves in the axial direction against the force of the coil spring 12. This axial movement causes
The flow of fluid flowing through the hole 3 formed in the center of the center post 9, the gap between the outer periphery of the plunger 7 and the inner periphery of the bobbin 5, and the small opening on the left side of the bobbin 5 in the figure can be controlled. can.

As described above, according to the solenoid valve of this invention, by providing a protrusion on the bobbin unit which presses the seal member against the inner bottom surface of the frame,
By eliminating uneven contact of the bobbin unit with the bottom of the frame, the circumferential compression rate of the O-ring can be made constant, thus achieving a perfect seal.

In addition, since the protrusion creates a gap between the bobbin unit and the bottom of the frame, the bobbin unit is easily deformed, and variations in the dimensions of the bobbin unit can be absorbed without increasing the caulking load. The settings can be made easier, and manufacturing can be facilitated.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of the solenoid valve of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1,
Figure 3 is a vertical sectional view showing a conventional solenoid valve, Figure 4 is an enlarged view showing a conventional seal in a correct state, and Figure 5 is an enlarged view showing a problem with a seal. be. Explanation of symbols, 1...Frame, 2...Bottom, 3
... hole, 4 ... bobbin unit, 5 ... bobbin,
6...Coil, 7...Plunger, 8A, 8B...
...Flange, 9...Center post, 10...O-ring, 14...Protrusion.

Claims (1)

[Claim for Utility Model Registration] A bobbin unit with a coil wound thereon is housed in a cylindrical frame with a bottom so that the inner periphery of the bobbin unit is inserted into a center post that is fixed through the bottom of the frame, and the opening of the frame is closed. A solenoid valve that assembles and fixes the bobbin unit to the frame by tightening the bobbin unit, and also attaches an annular seal member to the penetrating portion of the center post at the bottom of the frame, and crushes the seal member between the bobbin unit and the bottom of the frame to seal the solenoid valve. The solenoid valve characterized in that a plurality of protrusions are provided along the circumferential direction at a contact portion of the bobbin unit with the frame bottom.