JPH028137Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a solenoid valve having a mechanism for swinging and displacing a passage switching member by energizing and de-energizing an electric string coil to open and close a plurality of fluid passages opened in a valve chamber. This invention relates to a manual switching device.

It is known that a solenoid valve is equipped with a manual switching device, but the current manual switching device has a large number of parts.
Because of the high manufacturing costs, there is a need for an inexpensive manual switching device, especially for small solenoid valves.

The purpose of the present invention is to provide a manual switching device for a solenoid valve that has a simple structure but is reliable in operation. In the electromagnetic valve that opens and closes a plurality of fluid passages opened in a valve chamber, a valve body constituting the valve chamber and an elastic tongue-shaped protrusion protruding into the valve chamber are integrally molded from synthetic resin, and the tongue The free end of the protruding piece is formed with a slope part that is pushed up by the inner end of the operating member pushed in from the outside, and a support part that displaces the passage switching member by this pushing up action. The manual switching device for a solenoid valve is characterized in that a member is pressed toward the valve chamber by a spring having a spring pressure intermediate between high and low pressures generated within the valve chamber.

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 valve 1, a valve body 2, and a sub-base 3. The electromagnetic part 1 includes an electromagnetic coil 4, a fixed iron core 5,
It has a yoke 6, a movable core or passage switching member 7,
The passage switching member 7 has one end in contact with the yoke 6 to serve as a swinging fulcrum, and a valve rubber 8 is attached to the other end.
A valve chamber 9 facing upward is formed in the valve body 2, and a valve seat 10 facing upward and a valve seat 11 facing downward facing the valve seat 10 are provided. Fluid passages 12 and 13 are provided in the valve seats 10 and 11, respectively.
The valve rubber 8 of the passage switching member 7 contacts the valve seats 10 and 11 to enable the fluid passages 12 and 13 to be opened and closed. The spring 14 brings the swinging fulcrum of the passage switching member 7 into contact with the yoke 6, and the spring 15 presses the valve rubber 8 of the passage switching member 7 against the valve seat 10 when the electromagnetic valve is not energized. Further, the sub-base 3 is provided with ports 20, 21, and 22, the port 20 communicates with the fluid passage 12 and the valve seat 10, the port 21 communicates with the valve chamber 9 via the fluid passage 23, and the port 22 communicates with the valve chamber 9 through the fluid passage 23.
communicates with the fluid passage 13 and the valve seat 11.

The above-mentioned structure of a solenoid valve is already known, and FIG. 1 shows the non-energized state, in which the valve rubber 8 of the passage switching member 7 is pressed against the valve seat 10 by the spring 15, and the valve seat 11 is pressed against the valve seat 11. is open. Therefore, the fluid passing through the port 21 flows through the fluid passage 23, the valve chamber 9, and the fluid passage 13 to the port 22. When the electromagnetic coil 4 is energized, the fixed core 5 pulls up the passage switching member 7 against the spring 15, and the valve rubber 8 contacts the valve seat 11 and blocks the fluid passage 13. Fluid passing through port 20 passes through fluid passageway 12 and into valve chamber 9;
It flows to port 21 via fluid passage 23 . In this way, the passage switching member 7
will be opened and closed.

Next, the manual switching device according to the present invention will be explained using the solenoid valve shown in FIG. 1 having the above-mentioned structure.As shown in FIG. A protruding elastic tongue 30 is integrally molded. In the embodiment, the tongue-like protrusion 30 is composed of an elastic part 31, a support part 32 provided at the free end of the tip of the elastic part 31 and facing upward to the passage switching member 7, and a slope part 33. base 34
is integrally connected to the inner surface of the side wall of the valve chamber 9. An operating member 35 is slidably attached to the inside of the valve body 2 from a side hole, and this operating member 3
5 has a head 36 that can be operated from the outside and a shank 37 that protrudes into the valve chamber 9, and a sealing member 38.
A seal is formed between the valve body 2 and the valve body 2. The shank 37 has a spring 39 which is weaker in restoring force than the restoring force of the tongue 30 so that the inclined surface 40 at the tip maintains contact with the inclined surface 33 of the tongue 30, and the operating member 35 is connected to the retaining member 41. This prevents it from slipping out to the outside.

Since the embodiment according to the present invention has the above-described configuration, the passage switching member 7 is connected to the spring 1 as shown in FIG.
5 to maintain the lower position, and the valve rubber 8 to the valve seat 10.
When the valve seat 11 is pressed to close the fluid passage 12, the valve seat 11 opens and the fluid passage 13 communicates with the valve chamber 9. In this state, as shown in FIG. 2, when the operating member 35 is manually pushed into the valve chamber 9, the shank 37 moves forward and its sloped portion 40
The tongue-like protrusion 30 is pushed up. That is, the elastic portion 31 of the tongue-like protrusion 30 is bent, the support portion 32 rotates the passage switching member 7 against the spring 15, and presses the valve rubber 8 against the valve seat 11.
Then, the fluid passage 13 is blocked, and the fluid passage 12
communicates with the valve chamber 9, and the solenoid valve is switched to manual mode. Here, if you release your hand from the operating member 35, the operating member 35, the tongue-like protrusion 30, and the passage switching member 7 are moved to the first position by the elasticity of the tongue-like protrusion 30 and the action of the spring 15.
This will return to the state shown in the figure.

In this embodiment, the operating member 35 can be operated as a display mechanism for the valve chamber pressure, that is, a display mechanism for the switching state of the electromagnetic valve. In order to operate only the manual switching device itself, the weak spring 39 that presses the operating member 35 in the direction of the valve chamber 9 is not necessary, and only the elastic force of the tongue 30 is used to operate the operating member 35 when the operating member 35 is opened. It can be used as resilience. However, in order to display the switching state by the operating member 35, the elastic restoring position of the tongue 30 is set to the position shown in FIG. 1, and the operating member 35 is moved outward by a certain dimension from the position shown in FIG. Supported by the valve body 2, the operating member 35 is pushed inward by a weak spring 39,
The contact between the slope parts 33 and 40 is maintained. Then, the spring pressure of the weak spring 39 may be selected so that the operating member 35 moves outward due to the high pressure at the time of switching the solenoid valve and maintains the position shown in FIG. 1 when a low pressure occurs. .

With this switching state display mechanism, during normal operation of the solenoid valve, the fluid passage 12 is opened by, for example, excitation of the solenoid valve, and the pressurized fluid flows from the port 20 through the fluid passage 12, the valve chamber 9, and the fluid passage 23. port 2
1, the pressure inside the valve chamber 9 becomes high, and the spring 3
This is the position where the operating member 35 is pressed outward against the force 9. When the solenoid valve is de-energized and the pressure in the valve chamber 9 is discharged through the fluid passage 13 to the port 22, the operating member 35 is returned to the position shown in FIG. 1 by the spring 39. This makes it possible to know the state of the pressure inside the valve chamber 9, and to confirm the actual operation of the electromagnetic valve by energizing and de-energizing it.

As mentioned above, the manual switching device for a solenoid valve according to the present invention has an extremely simple structure that enables manual switching, and in particular, since the valve body and the tongue-like protrusion are integrally molded from synthetic resin, there are no parts required. A small solenoid valve with a simple structure and a small number of points can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of a manual switching device for a solenoid valve according to the present invention, with FIG. 1 being a sectional view of the device in its non-excited state, and FIG. 2 being a sectional view of the device in its manual switching state. 1 is an electromagnetic part, 2 is a valve body, 3 is a sub-base, 4 is an electromagnetic coil, 5 is a fixed core, 6 is a yoke, 7 is a passage switching member, 8 is a valve rubber, 9 is a valve chamber,
10, 11 are valve seats, 12, 13, 23 are fluid passages, 14, 15, 39 are springs, 20, 21, 22
is a port, 30 is a tongue-shaped piece, 31 is an elastic part, 35
is an operating member.

Claims (1)

[Scope of utility model registration request] In a solenoid valve that opens and closes a plurality of fluid passages opened in a valve chamber by displacing a passage switching member by energizing and de-energizing an electromagnetic coil, a valve body forming the valve chamber and an elastic member protruding into the valve chamber are provided. The tongue-shaped protrusion is integrally molded from synthetic resin, and the free end of the tongue-like protrusion has a slope portion that is pushed up by the inner end of the operating member pushed in from the outside, and a sloped portion that is pushed up by the inner end of the operating member that is pushed in from the outside. a support portion for displacing the passage switching member, and the operating member is pressed in the direction of the valve chamber by a spring having a spring pressure intermediate between high pressure and low pressure generated in the valve chamber. Manual valve switching device.