JPH035735Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a solenoid valve, and its main purpose is to reduce the inclination of the plunger by adopting a structure in which the plunger is loosely engaged with the outer peripheral surface of a column that projects into the valve chamber. The purpose of the present invention is to prevent malfunctions caused by external vibrations by reducing the amount of vibration and ensuring reliable valve operation, and by reducing the weight of the plunger.

[Conventional technology]

Conventionally, this type of electromagnetic valve is known to have a plunger 9 whose overall length is shortened to reduce its weight, as shown in FIG. 6, but this plunger 9 tilts in the valve chamber 3 due to its small bore ratio. Sometimes.

Therefore, in many solenoid valves, the overall length of the plunger 9 is increased, as shown in FIG. 7, and the so-called bore ratio is increased. A guide portion that comes into contact with the body forming the chamber is provided to prevent the plunger from tilting in the valve chamber as much as possible, thereby allowing relatively good valve operation.

Note that in FIG. 7, reference numeral 2 represents a coil, and 1a represents a cylinder.

[The problem that the idea attempts to solve]

However, the solenoid valve shown in Fig. 7 and Utility Model Application Publication No. 57-141278 has an empty plunger, so it is heavy and when installed in a vibrating system (such as an automobile), the plunger will vibrate due to inertia, causing malfunction. may occur.

Furthermore, since the valve disk 16 of the solenoid valve shown in FIGS. 6 and 7 is insert molded into the plunger 9, there are problems such as high molding costs.

[Means to solve the problem]

The present invention has been made in view of the above-mentioned drawbacks of the conventional example. Specifically, the cylinder of the bobbin around which the coil is wound is used as a valve chamber, and the plunger is placed in the valve chamber before suction. In the electromagnetic valve, a spring is disposed to return the valve to its original position, and a valve disk supported by the plunger is opposed to the valve port. A thin, hollow cylindrical plunger is loosely connected to the body by protruding the body, and having the valve port at the tip of the column, and providing a ridge portion on the outer peripheral surface of the column to form a fluid passage. A hole is formed at the end of the plunger opposite to the valve port, and the valve disk is engaged with the hole.

[Effect]

According to the present invention, the plunger is guided by a column projecting into the valve chamber, so that the problem of tilting of the plunger is solved.

Furthermore, since the plunger is thin and has a hollow cylindrical shape, it is lightweight, and malfunctions due to vibration do not occur.

Further, since there is a gap between the inner wall of the cylinder and the outer periphery of the plunger, even if the cylinder undergoes some degree of thermal deformation or contraction, the operation of the plunger is not affected.

〔Example〕

The present invention will be described below with reference to FIGS. 1 and 2, which show embodiments, and FIGS. 3 to 5, which are sectional views of the main parts of FIGS. 1 and 2.

First, referring to FIGS. 1 and 2, which are sectional views of a three-neck solenoid valve, reference numeral 1 indicates a resin bobbin around which a coil 2 is wound, and a valve chamber 3 is formed within a cylinder 1a of the bobbin 1. Further, a hollow column 4 made of a non-magnetic material integrally molded with the bobbin 1 protrudes from the valve chamber 3, and a normally closed port 6 is formed in a joint pipe 5 extending from the column 4. Furthermore, bobbin 1
A joint pipe 7 extending in a direction intersecting the joint pipe 5 is integrally molded in the joint pipe 5, and a common port 8 is provided in the joint pipe 7.
is formed.

A plunger 9 made of a thin cylindrical magnetic material is loosely connected to the column 4, and an end 9a of the plunger 9 faces a valve port 10 formed at the tip of the column 4. The outer periphery of the plunger 9 is placed a short distance from the inner wall of the cylinder 1a.

Incidentally, the outer peripheral surface of the columnar body 4 is provided with a ridge 4a, and the ridge 4a has a bead shape in the embodiment shown in FIG. 3, and a chevron shape in the embodiment shown in FIG. Here, the ridge portion 4a serves to guide the plunger 9 in a sliding manner, and forms a fluid passage 11 on the outer periphery of the columnar body 4. Also, cylinder 1 of bobbin 1
A joint pipe 13 made of a magnetic material and provided with a normally open port 12 is inserted into the shaft a through an O-ring 19, and faces the column 4 with a gap in between. The joint pipe 13 has a valve port 14 bored at its end on the valve chamber side, and the valve port 14 communicates with the normally open port 12 .

On the other hand, the end 9a of the plunger 9 opposite the valve port has a hole 1.
5 is bored, and a valve disk 16 made of an elastic body is engaged with the hole 15. By the way, one end of the valve disk 16 is spherical and faces the valve port 10 of the columnar body 4, and the other end is flat and faces the joint pipe 13.
It faces the valve port 14 of. Further, a spring 17 is resiliently mounted between the end 9a of the plunger 9 facing the valve port and the end of the joint pipe 13 on the valve chamber side for returning the plunger 9 to the position before suction.

Note that 18 is a resin mold that insulates the coil 2.

In the embodiment configured as described above, when the coil 2 is not energized, the plunger 9 is in the state shown in the figure due to the repulsive force of the spring 17, and the spherical part of the valve disc 16 closes the valve port 10 of the columnar body 4. The flat portion is separated from the valve port 14 of the joint pipe 13, leaving the valve port 14 open. Therefore, in this case, when fluid flows in from the common port 8 of the joint pipe 7, the fluid flows out from the normally open port 12 through the space between the plunger 9 and the cylinder 1a and through the valve port 14 of the joint pipe 13. become.

Next, when the coil 2 is energized, the magnetic circuit changes to the yoke 20.
21 and the joint pipe 13, and the valve chamber side end of the joint pipe 13 becomes a magnetic (adsorption) wall, so the plunger 9 is pulled toward the joint pipe 13 side against the repulsive force of the spring 17. At the same time, the valve disc 16 closes the valve port 14 of the joint 13,
The valve port 10 of the columnar body 4 is opened. Therefore, in this case, when fluid is allowed to flow in from the common port 8 of the joint pipe 7, the fluid passes through the fluid passage 11 between the plunger 9 and the column 4 and the valve port 10 of the column 4 to the normally closed port 6. It will flow out from.
When the coil 2 is de-energized again, the plunger 9 is brought into the state shown in the figure due to the reaction force of the spring 17, and the common port 8 and the normally open port 12 are communicated with each other.

By the way, since the plunger 9 slides while being guided by the column 4, there is no tilting movement, and the valve disk 16 can be reliably brought into surface contact with the valve seats around the valve ports 10 and 14, so that so-called complete valve port closure is achieved. achieved. Furthermore, since the plunger 9 has a thin cylindrical shape and is lightweight, malfunctions due to vibration do not occur, and the repulsive force of the spring 17 can also be selected to be as small as possible.

Furthermore, the member that guides the sliding movement of the plunger 9 is the column 4 instead of the cylinder 1a of the bobbin 1, and since there is a gap between the inner wall of the cylinder 1a and the outer periphery of the plunger 9, the heat of the cylinder 1a Malfunction of the plunger 9 due to deformation or contraction can be prevented. Further, since the plunger 9 is provided with a hole 15 and the valve disk 16 is engaged with the hole 15, the cost for assembling the valve disk 16 can be significantly reduced.

[Effect of idea]

As mentioned above, in the present invention, the plunger is thin-walled, hollow cylindrical, and lightweight, so malfunctions due to vibration do not occur, and the repulsive force of the spring can be selected to be as small as possible. Further, since the member that guides the sliding movement of the plunger is a column, if the distance between the plunger and the cylinder is sufficiently large, malfunction of the plunger due to thermal deformation or contraction of the cylinder can be prevented. Furthermore, since a hole is formed in the plunger to engage the valve disk, the cost for assembling the valve disk can be significantly reduced.

In addition, the member that guides the sliding of the plunger is a column rather than the cylinder of the bobbin, and there is a gap between the inner wall of the cylinder and the outer periphery of the plunger, so the plunger may malfunction due to thermal deformation or contraction of the cylinder. can be prevented.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a three-port solenoid valve that is an embodiment of the present invention, Figure 2 is a cross-sectional view of the solenoid valve shown in Figure 1 taken in different directions, and Figure 3 is an embodiment of the present invention. 4 is a sectional view showing a modified example of FIG. 3, FIG. 5 is a sectional view of the plunger portion in a similar embodiment, and FIG. 6 is a conventional electromagnetic FIG. 7 is a sectional view showing another conventional electromagnetic valve. 1... Bobbin, 1a... Cylinder, 2... Coil, 3... Valve chamber, 4... Column, 4a... Ridge, 5
...Joint pipe, 6...Normally closed port, 7
...Joint pipe, 8...Common port, 9...Plunger, 9a...End, 10...Valve port, 11...Fluid passage, 12...Normally open port, 13
...Joint pipe, 14...Valve port, 15...Hole, 16...
...Valve disc, 17...Spring, 18...
...Resin mold, 19...O ring, 20...Yoke, 21...Yoke.

Claims (1)

[Scope of utility model registration request] The inside of the cylinder of the bobbin around which the coil is wound is used as a valve chamber, and a plunger and a spring for returning the plunger to the position before suction are arranged in the valve chamber,
In the electromagnetic valve in which the valve disk supported by the plunger is opposed to the valve port, a gap is provided between the inner wall of the cylinder and the outer periphery of the plunger, and a column protrudes into the valve chamber. A thin-walled, hollow cylindrical plunger is provided with the valve port at its tip, and a ridge portion is provided on the outer circumferential surface of the column to form a fluid passage, and the end of the plunger opposite to the valve port is provided with a ridge portion to form a fluid passage. A solenoid valve characterized in that a hole is formed to engage the valve disk.