JPH0426769Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a type of electromagnetic valve in which a passage switching member contacts one or the other valve seat to open and close a plurality of fluid passages by energizing and de-energizing an electromagnetic coil. It is.

Electromagnetic systems of the type described above are already known and widely used. However, in order to configure two valve seats facing each other, which are opened and closed by the vertical movement of the valve switching member, the structure of the valve body becomes complicated, and the connection between the electromagnetic part and the valve body also becomes complicated. It is difficult to manufacture the solenoid valve itself at low cost. Furthermore, it is difficult to set the correct stroke of the valve switching member due to variations in the dimensions of each component, and furthermore, there is a drawback that malfunction may occur due to uneven wear during operation.

The purpose of the present invention is to provide a solenoid valve that operates stably and reliably by preventing the adverse effects of variations in the dimensions of each component related to the stroke of a passage switching member and by allowing uneven wear to be easily corrected. The gist thereof is an electromagnetic part having an electromagnetic coil wound around a hollow bobbin, a fixed iron core inserted into the center of the bobbin, and a yoke combined with the fixed iron core, and a valve connected via a lower flange of the bobbin. The passage switching member, which consists of a main body and a movable iron core that is attracted to the lower end surface of the fixed iron core, is swung by the energization and de-excitation of the electromagnetic coil. In a solenoid valve in which a valve seat and an upwardly facing valve seat provided on the main body side are selectively opened and closed by the passage switching member, a lower end surface of the fixed iron core forming a lower end surface of the electromagnetic part. , the lower end surface of the yoke, the lower end surface of the downward facing valve seat, and the lower end surface of the lower flange of the bobbin are polished to the same plane, and the passage switching member is accommodated in the valve body side, and one end thereof is The yoke is forcibly brought into contact with the lower end surface of the yoke by a spring so that this end portion is used as a fulcrum for the swinging, and the lower end surface of the electromagnetic portion is used as an attraction surface of the passage switching member.

The present invention will be explained in detail based on illustrated embodiments.

The drawing shows an example of a three-port solenoid valve, and this solenoid valve is composed of a solenoid section 1, a valve body 2, and a sub-base 3. The electromagnetic section 1 has an electromagnetic coil 4, a bobbin 5, a fixed core 6, a shading coil 7, a yoke 8, and a movable core, that is, a passage switching member 9. The passage switching member 9 has one end in contact with the yoke 8 and serves as a fulcrum for swinging. is,
A valve rubber 10 is attached to the other end. A valve chamber 11 is formed in the valve body 2, and a valve seat 12 facing upward and a valve seat 13 facing downward formed on the bobbin 5 opposite to the valve seat 12 are provided. The valve seats 12 and 13 are provided with fluid passages 14 and 15, respectively, and the valve rubber 10 of the passage switching member 9 is connected to the valve seats 12 and 1.
3 so that the fluid passages 14 and 15 can be selectively opened and closed. The leaf spring 16 brings the swinging fulcrum of the passage switching member 9 into contact with the yoke 8, and the spring 17 presses the valve rubber 10 of the passage switching member 9 against the valve seat 12 when the electromagnetic valve is in a non-energized state. . The sub-base 3 is attached to the lower part of the valve body 2,
A supply port 20 and an output port 21 are provided,
Supply port 20 passes through fluid passageway 14 to valve seat 12
The output port 21 communicates with the valve chamber 11 via a fluid passage (not shown). In the present invention, as shown in FIG. 2, one valve seat 13 is attached to the bobbin 5.
are formed, and the parts related to the stroke of the passage switching member 9, that is, the end faces of the fixed iron core 6, yoke 8, and valve seat 13, to which the passage switching member 9 is attracted in an excited state.
The lower end surface of the lower flange 25 of the bobbin 5, which forms the combined sealing surface of the valve body 2 and the electromagnetic valve 1, is flush.

Here, to explain the operation of the above-mentioned solenoid valve, FIG. 1 shows a non-excited state, and the passage switching member 9
is separated from the fixed iron core 6, the valve rubber 10 is pressed against the lower valve seat 12 by the spring 17, and the fluid passage 14,
The supply port 20 is isolated from the valve chamber 11. Then, the valve seat 13 opens and the fluid passage 15 opens into the valve chamber 1.
1. Communicates with the output port 21.

When the electromagnetic valve is energized, the valve rubber 10 of the passage switching member 9 opens the valve seat 12 and closes the valve seat 13, as shown in FIG. Therefore, supply port 20
communicates with the output port 21 via the fluid passage 14, the valve seat 12, and the valve chamber 11. Then, since the valve seat 13 is closed, the valve chamber 11 and the fluid passage 15 are cut off.

Additionally, this embodiment is provided with a manual switching device. As shown in FIG. 1, a tongue-shaped member 30 is provided within the valve chamber 11. For example, the valve body 2 is made of synthetic resin, and the tongue-shaped member 30 is molded integrally with the valve body 2. In the embodiment, the tongue member 30
is composed of an elastic part 31, a support part 32 facing upward to the passage switching member 9, and a slope part 33,
The base portion 34 of the elastic portion 31 is integrally connected to the inner surface of the side wall of the valve chamber 11 . An operating member 35 is slidably attached to the inside of the valve body 2 through a side hole, and this operating member 35 has a head 36 that can be operated from the outside and a shank 37 that protrudes into the valve chamber 11. However, a seal between the valve body 2 and the valve body 2 is provided by a seal member 38. The slope portion 39 at the tip of the shank 37 is kept in contact with the slope portion 33 of the tongue member 30, and the operating member 35 is connected to the retaining member 4.
1 prevents it from slipping out to the outside.

According to this manual switching device, in the non-excited state, the passage switching member 9 is kept in the downward position by the spring 17 as described above, and the valve rubber 10 is pressed against the valve seat 12 and closes the fluid passage 14, and at the same time, Valve chamber 13
is opened, and the fluid passage 15 communicates with the valve chamber 11. When the operating member 35 is manually pushed into the valve chamber 11 in this state, the shank 37 moves forward and its sloped portion 39 slides along the sloped portion 33 of the tongue-shaped member 30, pushing the tongue-shaped member 30 upward. That is, the elastic part 31 of the tongue member 30 is bent, and the support part 32 is bent by the spring 17.
The passage switching member 9 is rotated against the
is pressed against the valve seat 13. Then, the fluid passage 15 is shut off, the fluid passage 14 is communicated with the valve chamber 11, and the solenoid valve is switched to manual operation. If the user releases the operating member 35, the operating member 35, the tongue member 30, and the passage switching member 9 will return to their original states due to the elasticity of the tongue member 30 and the action of the spring 17.

As described above, in the solenoid valve according to the present invention, the lower end surface of the fixed core constituting the lower end surface of the electromagnetic part, the lower end surface of the yoke, the lower end surface of the downward valve seat, and the lower end surface of the lower flange of the bobbin are arranged on the same plane. Since they are polished, the passage switching member can be attracted to all these surfaces with the correct stroke. Therefore, adjustments to variations in the dimensions of each part when assembling the electromagnetic part, correction of uneven wear caused by operation, etc. can be easily and accurately performed simply by polishing the lower end surface of the electromagnetic part. It is possible to realize the operation.
Furthermore, the passage switching member is housed on the valve body side, and one end, which serves as a swinging fulcrum, is simply brought into contact with the lower end surface of the yoke of the electromagnetic part by means of a spring.
It is easy to assemble and disassemble the electromagnetic part and the valve body.

[Brief explanation of the drawing]

The drawing shows an embodiment of the solenoid valve according to the present invention,
FIG. 1 is a sectional view of the non-excited state, FIG. 2 is a sectional view of the electromagnetic section, and FIG. 3 is a sectional view of the electromagnetic portion. Symbols: 1 is the electromagnetic part, 2 is the valve body, 3 is the sub-base, 4 is the electromagnetic coil, 5 is the bobbin, 6 is the fixed core, 8 is the yoke, 9 is the passage switching member, 10 is the valve rubber, 11 is the valve chamber , 12, 13 are valve seats, 14, 15
16 and 17 are springs, 20 and 21 are ports, and 25 is a flange.

Claims (1)

[Scope of utility model registration request] It consists of an electromagnetic coil wound around a hollow bobbin, an electromagnetic part having a fixed iron core inserted into the center of the bobbin, and a yoke combined with the fixed iron core, and a valve body connected via a lower flange of the bobbin, The path switching member consisting of the movable iron core that is attracted to the lower end surface of the fixed iron core is activated by excitation of the electromagnetic coil.
By swinging by de-energizing, the passage switching member selectively opens and closes a downward facing valve seat provided on the lower flange of the bobbin and an upward facing valve seat provided on the valve body side. In the solenoid valve, the lower end surface of the fixed iron core, the lower end surface of the yoke, the lower end surface of the downward valve seat, and the lower end surface of the lower flange of the bobbin, which constitute the lower end surface of the electromagnetic part, are arranged on the same plane. The passage switching member is housed in the valve body side, and one end thereof is forcibly brought into contact with the lower end surface of the yoke by a spring, and the end is used as a fulcrum for the swinging, and the electromagnetic part is A solenoid valve characterized in that a lower end surface is an attraction surface of the passage switching member.