JPS594213Y2 - Solenoid switching valve - Google Patents

Description

[Detailed explanation of the idea] Field of use The present invention relates to an electromagnetic switching valve.

Prior art and its problems For example, as described in Japanese Utility Model Publication No. 52-43452, two valve seats facing each other in a valve chamber are opened and closed by a valve body driven directly by a movable iron core. Such a solenoid valve is known.

This solenoid valve has a pair of divided pieces formed by making a notch in the lower end of the movable core, and two valve bodies that open and close two valve seats are attached between the two divided pieces inserted into the valve chamber. The impact force of the valve body, which closes the valve directly when the movable core is attracted, is absorbed and alleviated by a coil spring contracted between the valve body and the movable core.

However, in this type of solenoid valve, the movable iron core is provided with a divided piece, and the valve body and coil spring are built inside, so the structure is complicated, and especially when downsizing the solenoid valve, it is difficult to move the solenoid valve. The disadvantage is that processing and assembly of the iron core is complicated.

Technical Problems of the Present Invention The technical problems to be solved in the present invention are to arrange the valve body and spring in a non-incorporated state in the movable core, and in particular to arrange the spring in a state that makes it easy to attach even to a small solenoid valve. The purpose of this is to simplify the valve structure.

Technical means The technical means taken to solve the above problem is to connect the valve body provided between two opposing valve seats and the movable iron core in the electromagnetic operation part to a U-shaped structure that abuts one side of the valve body. When the movable iron core is attracted through a leaf spring and a push rod, the valve body is connected to one valve seat in a direct and cushioning manner, and the valve body is connected to the other valve seat on the other side of the valve body. This is because a return valve spring that urges the valve toward the seat is compressed.

action The above technical means works as follows.

That is, the movable iron core and the valve body are connected via the push rod and the leaf spring, thereby simplifying the structure.

Further, the impact force caused by the seating of the valve body when the movable iron core is attracted is absorbed by the elasticity of the leaf spring, and the seating is performed in a cushioning manner.

Unique effects of this invention The present invention produces the following unique effects.

That is, since the U-shaped leaf spring is used for buffering the valve body, biasing force acts equally on the left and right sides of the valve body, so that the valve body is stably seated on the valve seat.

Further, by providing holes or notches in the leaf spring and cutting out the thickness, the elastic force can be easily adjusted.

Embodiment Hereinafter, an embodiment of the present invention will be explained in detail based on the drawings. In FIG.
And inside the valve housing 1 equipped with the discharge port 5,
A valve chamber 6 communicating with the output port 4 is provided, and a first valve seat 7 communicating with the input port 3 and a second valve seat 8 communicating with the discharge port 5 are formed in the valve chamber 6 to face each other. A valve body 9 is disposed between both valve seats 7 and 8 and is pressed against the first valve seat 7 by a valve spring 10, and is alternately pressed against the valve seats 7 and 8 to switch the flow of fluid.

The first valve seat 7 is provided on a partition wall 11 that is integral with the valve housing 1, and the second valve seat 8 is provided on a valve seat body 12 that is screwed into the valve chamber 6 through a sealing member 13. However, as shown in FIG. 5, the partition wall portion 11 may be formed separately from the valve housing 1 and fitted into the upper part of the valve chamber 6 via the seal member 11a. Threaded portion 12 in seat body 12
a may be formed separately from the main body portion of the valve seat body, as shown by the chain line in FIG.

The partition wall portion 11 has a guide hole 1 penetrating vertically.
4 are bored on the left and right, and the lower end of an inverted U-shaped plate spring 17 inserted into the guide hole 14 from the upper chamber 16 between the partition wall 11 and the fixed iron core 15 of the electromagnetic operation section 2 is connected to the valve chamber. 6, the push rod 18 is brought into contact with the upper surface of the valve body 9, the lower end of the vertically movable push rod 18 passing through the center of the fixed iron core 15 is brought into contact with the upper surface of the iron plate spring 17, and the push rod is led out into the iron core chamber 19. 1
The upper end of 8 is brought into contact with the lower surface of the movable iron core 20.

Further, a manual button 21 that can be pressed downward is attached to the upper end of the iron core chamber 19 via a seal member 21a, and the movable iron core 20 can be manually pressed down using the manual button 21. are doing.

In addition, in the figure, 22 is an electromagnetic coil, 23 is a sealing member, and 24
is a resin molding material that covers the outside of the electromagnetic operation section 2.

Next, the operation of the electromagnetic switching valve described above will be explained.

In the state shown in FIG. 1 in which the electromagnetic coil 22 is not energized, the valve body 9
is pressed against the first valve seat 7 by the biasing force of the valve spring 10 to seal the fluid supplied from the manual port 3, and at the same time opens the second valve seat 8 to open the output port 4 and the discharge port 5.
It communicates with

When the electromagnetic coil 22 is energized, the movable iron core 20 is attracted by the fixed iron core 15 and moves downward. At this time, the leaf spring 17 is pushed down via the push rod 18, so the valve body 9 resists the valve spring 10. It is pressed down, opening the first valve seat 7 and closing the second valve seat 8.

Therefore, the input port 3 and the output port 4 communicate with each other, and the discharge port is blocked.

Therefore, when switching the valve body 9, the acting force due to the suction of the movable iron core 20 acts directly on the valve body 9 via the push rod 18 and the leaf spring 17, so that the switching is performed smoothly and reliably. Furthermore, the impact force when the valve body 9 is directly seated on the second valve seat 8 is absorbed by the elasticity of the leaf spring 17, and the valve body 9 is seated in an extremely cushioning manner. Become.

Moreover, since the iron plate spring 17 has a U-shape, the biasing force of the plate spring 17 acting on the valve body 9 is equal on the left and right sides, thereby ensuring stable seating of the valve body 9.

After the valve body 9 is seated, the urging force of the leaf spring 17 causes the valve body 9 to be
is held in pressure contact with the second valve seat 8.

Further, if the manual button 21 is pressed in the switching state shown in FIG. 1, the movable iron core 20 is pushed down, so that the valve body 9 can be switched without energizing the electromagnetic coil 22 during that time.

The above-mentioned valve body 9 may be formed integrally with only an elastic material, but as shown in FIG. 2, an elastic material 9b may be inserted into the center of a holder 9a made of synthetic resin or metal. Alternatively, the leaf spring 17 may be formed in a composite manner by providing a hole 17b or a notch 17C in the spring material 17H and cutting out appropriate thickness, as shown in FIGS. 3 and 4. By doing this, it is possible to improve the elasticity, and in order to prevent damage to the valve body, the lower end 17d can be folded back to improve contact with the valve body.

In the above embodiment, the movable core 20 and the valve body 9 are connected via the inverted U-shaped leaf spring 17 and the push rod 18, but the following spring mechanism is also provided. Connecting means can be employed.

That is, in the case of FIG. 6, the U-shaped leaf spring 25 and the valve body 9 are inserted into the connecting hole 25a at the lower end of the leaf spring and the protrusion 9 at the upper end of the valve body.
The presser plate 26 is brought into contact with the upper end of the leaf spring 25, and the presser rod 18 is attached to the upper surface of the presser plate 26.
The lower ends of the two are in contact with each other.

In this case, the presser plate 26 is also made to maintain elasticity, and the plate spring 25
The elasticity of both the presser plate 26 and the presser plate 26 may be utilized.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view showing an example of the valve body, Figs. 3 and 4 are perspective views showing an example of the structure of a leaf spring, and Fig. 5. and FIG. 6 are sectional views of main parts of different embodiments of the present invention. 1... Valve housing, 2... Electromagnetic operation section, 3
...Input port, 4...Output port,
5...Discharge port, 6...Valve chamber, 7.
...First valve seat, 8...Second valve seat, 9...
... Valve body, 10... Valve spring, 17.
25...Plate spring, 20...Movable iron core.

Claims (1)

[Scope of utility model registration request] A valve chamber communicating with the output port is provided inside a valve housing provided with an input port, an output port, and a discharge port, and a first valve seat communicating with the input port and a second valve seat communicating with the discharge port are provided in the valve chamber. are formed to face each other, and these valve seats are alternately opened and closed by a valve body driven by the electromagnetic force of the electromagnetic operation part and the return force of a spring,
The valve body and the movable core in the electromagnetic operating section are connected to each other by a U-shaped leaf spring and a push rod that contact one surface of the valve body, and when the movable core is attracted, the valve body is directly and directly attached to the valve seat. What is claimed is: 1. An electromagnetic switching valve characterized in that the valve element is connected to the other side of the valve element so as to be press-contactable in a cushioning manner, and a return valve spring that urges the valve element toward the other valve seat is contracted.