JPH071571Y2 - Self-holding solenoid valve with manual switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a self-holding solenoid valve provided with a manual switching device for manually switching a movable iron core between a suction position and a separation position.

[Prior Art] In general, a self-holding solenoid valve is a valve for switching a fluid flow between ports in a valve hole of a valve body having a plurality of ports, as disclosed in Japanese Utility Model Laid-Open No. 64-045074. A valve portion provided with a body and a solenoid portion for driving the valve body, the solenoid portion fixing a movable iron core connected to the valve body, a fixed iron core facing the movable iron core, and a movable iron core. It is composed of a first winding that is attracted to the iron core, a permanent magnet that holds the movable iron core in an attracted state to the fixed iron core, and a second winding that separates the movable iron core from the fixed iron core. The first winding is excited to move. When the iron core is attracted to the fixed iron core, the movable iron core is held in the attracted state by the permanent magnet even after the de-energization, and is separated from the fixed iron core when the second winding is excited. In this case, there is also one in which the first winding and the second winding are the same winding, and the movable iron core is attracted and separated by exciting in the opposite direction.

In such a self-holding solenoid valve, a manual switching device for manually switching the movable iron core between the suction position and the separation position so that the valve body can be opened and closed even in the event of a power failure. It is also known that the
In the conventional manual switching device, since the means for moving the movable iron core to the suction position and the means for moving the movable iron core to the separation position are separately configured, the structure is complicated and the switching operation is troublesome. There is a drawback that the solenoid valve becomes large due to the installation of the means.

Further, an electromagnetic valve having a manual switching device for directly switching the valve element by rotating the arm is proposed in Japanese Utility Model Laid-Open No. 54-022228.

Since this solenoid valve with a manual switching device can switch the valve element by rotating one arm in the forward and reverse directions, the switching operation is simple, but the valve element is directly displaced by the rotation of the arm. Since a dead zone for preventing the valve body from being displaced and a mechanism for regulating the displacement amount of the valve body are required, the structure becomes complicated and it is difficult to miniaturize.

[Problem to be Solved by the Invention] An object of the present invention is to provide a self-holding solenoid valve having a manual switching device which is simple in configuration and switching operation and can be downsized.

[Means for Solving the Problems] In order to solve the above problems, in a self-holding solenoid valve of the present invention, a valve body is provided in a valve hole of a valve body having a plurality of ports to switch a fluid flow between the ports. With the main valve
A pilot valve for switching the valve element by supplying and discharging pilot fluid to and from the main valve, the pilot valve including a movable iron core for opening and closing a pilot valve seat, a fixed iron core facing the movable iron core, and a fixed iron core for the movable iron core. A winding for adsorbing to the fixed core, a permanent magnet for holding the movable core in an attracted state to the fixed core, and a winding for separating the movable core from the fixed core,
Further, in a self-holding type solenoid valve having a manual switching device for manually switching the movable iron core between the suction position and the separated position, the manual switching device is mounted on the valve body so as to be rotatable in forward and reverse directions. And a protrusion formed on the movable iron core side. The operator has a pushing surface for pushing the protrusion, and the pushing surface rotates the operator to a neutral position. When this is done, the protrusion is released parallel to the axis of the movable iron core, and when the operation element is rotated in one direction, the protrusion is pushed in one direction to move the movable iron core to the adsorption position and rotate in the opposite direction. Then, the projection is pushed in the opposite direction to move the movable iron core to the separated position.

[Operation] When the manipulator in the manual switching device is rotated to the neutral position, the pushing surface is positioned parallel to the axis of the movable iron core to release the projection, so that the movable iron core moves in the axial direction regardless of the manipulator. It can be moved freely, and the valve element of the main valve can be switched by opening and closing the pilot valve seat by electromagnetic operation.

When switching the valve element by manual operation, when the above-mentioned operator is rotated in one direction from the neutral position, one end of the pushing surface engages with the protrusion, and the movable iron core is pushed to the suction position via the protrusion. Since the movable iron core is displaced, the movable iron core is attracted to the permanent magnet through the fixed iron core and is held in that state.

When the operator is rotated in the opposite direction, the other end of the pushing surface engages with the projection, and the movable iron core is pushed and displaced to the separated position via the projection.

Therefore, the valve element can be switched by shifting the movable iron core between the suction position and the separation position by the forward and reverse rotation operations of the single operator.

The manual switching device is provided with a protrusion on the movable core side and a pushing surface for pressing the protrusion on the operator, and the movable iron core is moved between the suction position and the separated position by rotating the operator in the forward and reverse directions. Therefore, the structure is extremely simple and can be downsized, and the switching operation is easy.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

The self-holding solenoid valve illustrated in FIG.
Main valve 1 configured as a port valve and configured to switch spool valve element 5 by pilot fluid
And a pilot valve 2 that supplies and discharges pilot fluid to and from the main valve 1, and is provided with a manual switching device 3 for manually switching the spool valve element 5.

The valve body 10 of the main valve 1 has an input port 11
And first and second output ports 12a, 12b located on both sides of the input port 11 and first and second discharge ports 13a, 13b located on both sides of these output ports 12a, 12b. In addition, a valve hole 14 for opening these ports is provided, and the spool valve element 5 for switching the flow direction of the fluid between the ports is slidably disposed in the valve hole 14. A first pilot pressure chamber 15a is formed on one side of the spool valve body 5, and a piston 17 having a larger pressure receiving area than the spool valve body 5 is provided in a piston chamber formed on the other side of the spool valve body 5. A second pilot pressure chamber 15b and a back pressure chamber 18 are formed on both sides of the piston 17 so as to be slidable, and the first pilot pressure chamber 15a is
The second pilot pressure chamber 15b is in continuous communication with the input port 11 through the pilot passage hole 19a. The second pilot pressure chamber 15b includes a push rod insertion hole 20, an iron core chamber 21, a pilot supply valve seat 22, and a pilot passage hole 19a.
It communicates with the input port 11 through b and the pilot discharge port 24 through the pilot discharge valve seat 23,
The back pressure chamber 18 communicates with the discharge port 24 through the through hole 18a.

A pilot discharge valve body 25 for opening and closing the pilot discharge valve seat 23 is disposed in the second pilot pressure chamber 15b,
The push rod 27 inserted into the push rod insertion hole 20 is connected to the movable iron core 30 of the pilot valve 2, and the valve body 25 is attached between the pilot discharge valve body 25 and the piston 17 in the valve closing direction. The biasing return spring 26 is contracted.

The pilot valve 2 includes a movable iron core 30 arranged axially movably in an iron core chamber 21, a fixed iron core 31 mounted so as to face the movable iron core 30, and a movable iron core 30 by excitation. Winding 32 that attracts the fixed core 31 to the fixed core 31 and the permanent magnet 3 that holds the movable core 30 in the state where the movable core 30 is attracted to the fixed core 31.
4, and a second winding 33 that separates the movable iron core 30 from the fixed iron core 31 by excitation. The movable iron core 30 has a movable auxiliary rod 35 whose tip abuts the fixed iron core 31, and the auxiliary rod 35. And a return spring 36 compressed between the
Is urged in a direction away from the fixed iron core 31, and a pilot supply valve element 37 for opening and closing the pilot supply valve seat 22 is attached to the tip of the movable iron core 30.

Therefore, when the first winding 32 is excited from the state shown in FIG. 1, the movable iron core 30 is attracted to the fixed iron core 31, and the pilot supply valve seat
Since 22 opens and the pilot discharge valve seat 23 closes, the pilot fluid flows into the second pilot pressure chamber 15b through the pilot passage hole 19b, the pilot supply valve seat 22, the iron core chamber 21, and the push rod insertion hole 20, and the piston 17 Act on. On the other hand, the pilot fluid always flows into the first pilot pressure chamber 15a and acts on the end portion of the spool valve body 5 to push the spool valve body 5 to the right in the figure. The spool valve element 5 moves leftward because the acting force acting on the input port 11 and the first output port 12a is large.
And the second output port 12b and the second discharge port 13b communicate with each other, and the second switching position is switched.

The movable iron core 30 is held in the attracted state by the permanent magnet 34 even after the excitation by the first winding 32 is released.

Next, when the second winding 33 is excited, the movable iron core 30 becomes a fixed iron core.
It is separated from 31, and is returned to the separated position of FIG. 1 by the return spring 36. For this reason, the pilot supply valve seat 22 is closed and the pilot discharge valve seat 23 is opened, and the pilot fluid in the second pilot pressure chamber 15b is discharged, so that the spool valve element 5 is disposed inside the first pilot pressure chamber 15a. It moves to the right due to the action force of the pilot fluid pressure, and switches to the illustrated first switching position in which the input port 11 and the second output port 12b communicate with each other and the first output port 12a and the first discharge port 13a communicate with each other. .

Further, the manual switching device 3 for manually switching the movable iron core 30 is a block forming a part of the valve body 10.
It is composed of an operator 40 attached to 10a and a protrusion 41 formed on the movable iron core 30 side. The protrusion 41 is formed by the movable iron core 30.
On the cap 42 fitted to the tip of the movable core 30, the movable core 30 is projected toward the side, while the manipulator 40 is rotated about an axis 40a orthogonal to the axis 30a of the movable core 30. It can be rotated in the opposite direction.
Is provided with a pushing surface 43 for pushing.

The pushing surface 43 is formed by a surface parallel to the rotation axis 40a of the operating element 40, and when the operating element 40 is rotated to the neutral position (see FIG. 2), the pushing surface 43 43 is positioned parallel to the axis 30a of the movable iron core 30 to release the protrusion 41,
When the movable iron core 30 is kept in a freely movable state and the operator 40 is rotated in one direction from the neutral position (see FIG. 3), one end of the pushing surface 43 engages with the protrusion 41 and the protrusion 41 By pushing 41, the movable iron core 30 is moved to a position where it is attracted to the fixed iron core 31, and the manipulator 40 is rotated in the opposite direction (see FIG. 4).
Then, the other end of the pushing surface 43 engages with the projection 41 and pushes the projection 41 in the opposite direction, whereby the movable iron core 30 is displaced to a position separated from the fixed iron core 31. Therefore, the projection 41 and the rotation center axis line 40a of the operator 40 are arranged so as to be located at a slight distance from each other in the side surface direction of the movable iron core 30.

In FIG. 1, 47 is a seal ring, and 48 is a stopper that defines the rotation range of the operator 40.

In addition, in the block 10a, as shown in FIG.
It is desirable to provide a display 50 indicating the switching position of the operator 40 with reference to the notch 49 cut at the top of 0, and the operator 40 is moved to the neutral position by a biasing means such as a spring. It is desirable to configure it to return automatically.

In the manual switching device 3 having the above structure, when the manipulator 40 is rotated to the neutral position as shown in FIG. 2, the pushing surface 43 is positioned parallel to the axis 30a of the movable iron core 30 and releases the projection 41. The movable iron core 30 is movable in the axial direction independently of the operator 40, and the spool valve element 5 can be switched by the electromagnetic operation as described above.

When switching the spool valve element 5 by manual operation,
When the manipulator 40 is rotated in one direction (ON direction) from the neutral position, one end of the pushing surface 43 engages with the protrusion 41 as shown in FIG. 3, and the movable iron core 30 passes through the protrusion 41. Is moved to the attracting position, the movable iron core 30 is attracted to the fixed iron core 31 excited by the permanent magnet 34 and held in that state. Therefore, the spool valve element 5 is switched to the second switching position by the action of the pilot fluid pressure.

When the operator 40 is rotated in the reverse direction (OFF direction), the other end of the pushing surface 43 engages with the protrusion 41 as shown in FIG.
The movable iron core 30 is pushed and displaced to the separated position via 41. Therefore, the spool valve element 5 is switched to the first switching position by the action of the pilot fluid pressure.

The self-holding solenoid valve of the present invention is not limited to the 5-port valve shown in the above embodiment, but may be a poppet type valve or may be a valve other than the 5-port valve.

[Advantage of the Invention] According to the present invention having the above-mentioned configuration, the valve element can be switched by shifting the movable iron core between the suction position and the separation position by the forward and reverse rotation operations of the single operator. Manual switching operation is extremely easy.

Further, since it is only necessary to provide the operator with the pushing surface and the projection on the movable iron core side, the configuration is extremely simple and the manual switching device can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a self-holding solenoid valve according to the present invention, FIGS. 2 to 4 are explanatory views showing an operating method of a manual switching device, and FIG. 5 is a main part of the solenoid valve. It is a top view. 1 ... Main valve, 2 ... Pilot valve, 3 ... Manual switching device, 5 ... Valve body, 10 ... Valve body, 11 ... Input port, 12a, 12b ... Output port, 13a, 13b ... Discharge port,
14 …… Valve hole, 30 …… Movable iron core, 31 …… Fixed iron core, 32,33
...... Winding, 34 ...... Permanent magnet, 40 ...... Operator, 41 ...... Projection, 43 ...... Pushing surface.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A main valve having a valve body for switching the flow of fluid between the ports in a valve hole of a valve body having a plurality of ports, and a pilot fluid is supplied to and discharged from the main valve to switch the valve body. A pilot valve, which comprises a movable iron core for opening and closing the pilot valve seat, a fixed iron core facing the movable iron core, windings for adsorbing the movable iron core to the fixed iron core, and a movable iron core for adsorbing the fixed iron core A self-holding solenoid valve including a permanent magnet for holding and a winding for separating the movable iron core from the fixed iron core, and having a manual switching device for manually switching the movable iron core between the attracting position and the separating position. In the above, the manual switching device includes an operator mounted on the valve body so as to be rotatable in forward and reverse directions, and a protrusion formed on the movable iron core side, and the operator pushes the protrusion. A pushing surface, the pushing surface is positioned parallel to the axis of the movable iron core to release the protrusion when the operator is rotated to the neutral position,
Rotating the actuator in one direction pushes the protrusion in one direction to move the movable iron core to the suction position, and rotating it in the opposite direction pushes the protrusion in the opposite direction to move the movable iron core to the separated position. A self-holding solenoid valve with a manual switching device, which is characterized in that it is displaced.