JPH0218386Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Purpose of invention] (Industrial application field) The present invention relates to a solenoid valve.

(Prior Art) A solenoid valve generally has a coil disposed outside a plunger that opens and closes the valve, and by energizing this coil, the plunger is attracted to open the valve, and the coil is de-energized. This causes the plunger to be biased by a spring to close the valve.

However, with this solenoid valve, the coil must be constantly energized in order to keep the valve open.

For this reason, there is an electromagnetic valve that uses a latching solenoid to open and close the valve, as described in, for example, Japanese Utility Model Application Publication No. 58-4870. This latching solenoid has two coils arranged outside the plunger in the axial direction in which the plunger moves, and a permanent magnet arranged between the coils.
By energizing the coil, the plunger can be moved to one side or the other in the axial direction about the permanent magnet, and the plunger can be moved to one or the other side in the axial direction about the permanent magnet. As a result, a magnetic flux circuit is formed in which the magnetic flux generated by the permanent magnet flows through the plunger and urges the plunger in its moving direction, and the plunger is maintained in a moving state even when the coil is de-energized. Therefore, in a solenoid valve using a latching solenoid, if the coil is temporarily excited to move the plunger when the valve is opened or closed, the valve can be maintained in the open or closed state by a magnetic flux circuit made up of permanent magnets. can do.

(Problem to be solved by the invention) In the solenoid valve using a latching solenoid as described above, the valve can maintain the open/closed state even if the coil is de-energized. The plunger must be moved to one side or the other in the axial direction, resulting in a very long movement stroke of the plunger, which also lengthens the opening/closing stroke of the valve, resulting in the problem that both the valve opening/closing mechanism and the valve body become large. be.

The present invention was developed in view of these points, and is capable of maintaining the open/closed state of the valve even when the coil is de-energized, and is compatible with cases where the moving stroke of the plunger is short. The object of the present invention is to provide a solenoid valve whose valve body can be made compact.

[Structure of the idea]

(Means for Solving the Problems) The present invention has a valve body 22 that opens and closes a valve seat 18, and is biased in the closing direction by a spring 23 to the outside of the plunger 21. A first main coil 26 is arranged to be moved to
A first permanent magnet 30 that generates a magnetic flux that biases the plunger 21 in the opening direction is disposed on one side of the first main coil 26, and is received from the outside on the other side of the first main coil 26. A second permanent magnet 33 whose polarity is reversed depending on the direction of the magnetic flux and changes to the same phase or opposite phase to the magnetic flux direction of the first permanent magnet 30.
is arranged outside the second permanent magnet 33 and is excited together with the first main coil 26 so that the polarity of the second permanent magnet 33 is in opposite phase to the magnetic flux direction of the first permanent magnet 30. A second main coil 36 is disposed outside the plunger 21 to move the plunger 21 in the closing direction when energized, and to change the polarity of the second permanent magnet 33 to that of the first permanent magnet 30. An auxiliary coil 27 is provided to reverse the magnetic flux direction so that it is in the same phase as the magnetic flux direction.

(Function) In the present invention, the plunger 21 is in the closed state,
When each coil 26, 27, 36 is not excited, the magnetic flux directions of the first permanent magnet 30 and the second permanent magnet 33 are in the same phase, and the magnetic flux direction from the first permanent magnet 30 to the second permanent magnet 33, a magnetic flux circuit is formed that flows from this second permanent magnet 33 to the first permanent magnet 30, and there is almost no magnetic flux passing through the plunger 21 in the axial direction, so that the plunger 21 is biased by the spring 23. It is kept closed by.

Also, from that state, the first and second main coils 2
6 and 36, the plunger 21 is moved in the opening direction against the bias of the spring 23 by the magnetic flux generated by the first main coil 26, and is in the open state. Due to the magnetic flux generated by 36, the polarity of the second permanent magnet 33 is reversed and becomes the opposite phase to the magnetic flux direction of the first permanent magnet 30, and the polarity of the second permanent magnet 33 is reversed. A magnetic flux circuit is configured in which the magnetic flux that biases the plunger 21 in the opening direction passes through the plunger 21 in the axial direction, and even if the first and second main coils 26 and 36 are de-energized, the plunger 21 is maintained in the open state. be done.

Furthermore, when the auxiliary coil 27 is excited from this state, the plunger 21 is moved in the closing direction by the magnetic flux generated by the auxiliary coil 27 to be in the closed state, and the polarity of the second permanent magnet 33 is changed again. The direction of the magnetic flux is reversed to be in the same phase as the magnetic flux direction of the first permanent magnet 30, and a magnetic flux circuit is formed between the first permanent magnet 30 and the second permanent magnet 33 as described above, and the auxiliary coil 27 is excited. Even when the plunger 21 is released, the plunger 21 is biased by the spring 23 and held in the closed state.

(Embodiment) Hereinafter, the configuration of an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, 11 is a valve body, and this valve body 11 is composed of a body 12, a guide cylinder 13, and a base 14. The body 12 is formed into a horizontally long cylindrical shape, and an inlet 15 is formed on one side thereof, and an outlet 16 is formed on the other side, and the inlet 15 is formed as an opening in the upper part of the body 12. A cylindrical valve seat 18 that communicates with the flow port 17 and communicates with the outlet 16 is provided within the flow port 17 . The base 14, on which the lower end of the guide cylinder 13 is fitted and fixed, is hermetically fitted to the upper part of the body 12 via an O-ring 19 fitted to the inner edge of the flow port 17.

A plunger 21 made of a magnetic material is fitted into the guide tube 13 so as to be movable in the vertical direction.
A valve body 22 is attached to the lower end of the plunger 21 to open and close the flow port 17 by moving toward and away from the valve seat 8. Further, a coil-shaped spring 23 is provided between the upper end of the guide tube 13 and the plunger 21.
A head 24 made of a magnetic material is hermetically fitted with the head 24 interposed therebetween, and the bias of the spring 23 causes the plunger 21 to move in the direction of the valve seat 18, that is, the flow port 17.
is always biased in the closing direction.

Further, on the outside of the guide tube 13, there is a first main coil 26 that generates a magnetic flux that moves the plunger 21 in the opening direction during excitation, and the phase of the magnetic flux generated by this first main coil 26 is opposite to that of the first main coil 26. Auxiliary coils 27 are arranged above and below to generate a magnetic flux that moves the plunger 21 in the closing direction and reverses the polarity of a second permanent magnet 33 (described later) so that it is in the same phase as the magnetic flux direction of the first permanent magnet 30. has been done. Flux plates 28 and 29 are attached to the lower surface of the first main coil 26 and the upper surface of the auxiliary coil 27, respectively. On one side is the plunger 2.
A first permanent magnet 30 that generates a magnetic flux that biases the first permanent magnet in the opening direction is attached via a magnet holder 31 that fits and holds the first permanent magnet 30. The polarity is reversed and the first
A second permanent magnet 33 that changes in phase with or in opposite phase to the magnetic flux direction of the permanent magnet 30 is disposed, and an iron core 34 fitted with this second permanent magnet 33 is formed on the flux plates 28 and 29. They are respectively fitted into and held in the fitted fitting holes 35 . The outside of the second permanent magnet 33 and the iron core 34 is excited together with the first main coil 26 to change the polarity of the second permanent magnet 33 to a phase opposite to the magnetic flux direction of the first permanent magnet 30. A second main coil 36 is fitted that generates a magnetic flux that is reversed so that

Further, a cover body 38 is attached over the upper surface of the upper flux plate 28 and the side part of the lower flux plate 29, and a fixing bolt 39 is attached to the cover body 38 and the upper flux plate 29 through a spring washer 40. They are inserted into through holes 38a, 28a formed in the flux plate 28, and screwed onto the upper part of the head 24.

Note that a conduit or the like through which fluid flows is airtightly connected to the inlet 15 and outlet 16 of the body 12.

Then, as shown in FIG. 2, this electromagnet is connected to an open switch 45 and a close switch 46 in parallel from the (+) pole of the power supply, and this open switch 45
is connected to the upper end of the first main coil 26 and the lower end of the second main coil 36, and the lower end of the first main coil 26 and the upper end of the second main coil 36 are connected to the power source. The close switch 46 is also connected to the lower end of the auxiliary coil 27, and the upper end of this auxiliary coil 27 is connected to the (-) pole of the power supply.

In FIG. 1, the plunger 21 is in a closed state in which it is lowered, and the coils 26, 27, and 36 are not excited. In this state, as shown in FIG. 3, the magnetic flux directions of the first permanent magnet 30 and the second permanent magnet 33 are in the same phase, and the first permanent magnet 30
A magnetic flux circuit is constructed in which the flux flows from the upper flux plate 28 to the second permanent magnet 33, and from this second permanent magnet 33 to the lower flux plate 29 and then to the first permanent magnet 30. Almost no magnetic flux passes through the plunger 21 in the axial direction, so the plunger 21 is kept closed by the bias of the spring 23.

Next, when the open switch 45 is turned on, the current from the power source flows through the first main coil 26 and the second main coil 36, and the first main coil 26, second main coil 36,
36 is excited, the first main coil 26 generates a magnetic flux that moves the plunger 21 in the opening direction, and the second
The main coil 36 generates a magnetic flux that inverts the polarity of the second permanent magnet 33 so that it has an opposite phase to the magnetic flux direction of the first permanent magnet 30. Then, the fourth
As shown in the figure, the plunger 21 is pulled up by the magnetic flux generated by the first main coil 26 against the bias of the spring 23, and the valve body 22 is separated from the valve seat 18 to be in the open state. Furthermore, since the polarity of the second permanent magnet 33 is reversed and the phase is opposite to the magnetic flux direction of the first permanent magnet 30, the plungers 21 of the first permanent magnet 30 and the second permanent magnet 33 are moved in the opening direction. A magnetic flux circuit is configured in which the energizing magnetic flux passes through the plunger 21 in the axial direction, and even if the open switch 45 is turned off and the excitation of the first and second main coils 26 and 36 is released, the plunger 21 remains in the open state. is held in

Next, when the closing switch 46 is turned on, the current from the power source flows to the auxiliary coil 27, which is excited and moves the plunger 21 in the closing direction and changes the polarity of the second permanent magnet 33 to the first
generates a magnetic flux that is reversed so that it has the same phase as the magnetic flux direction of the permanent magnet 30. Then, the fifth
As shown in the figure, the magnetic flux generated by the auxiliary coil 27 passes through the plunger 21 in the axial direction, so the plunger 21 is pushed down and the valve body 22 is brought into close contact with the valve seat 18 and closed. Further, the polarity of the second permanent magnet 33 is reversed again by the magnetic flux generated by the auxiliary coil 27, so that it becomes in phase with the magnetic flux direction of the first permanent magnet 30, and the magnetic flux circuit shown in FIG. 3 is configured. is,
Even if the closing switch 45 is turned off and the auxiliary coil 27 is de-energized, the plunger 21 is
is energized to maintain the closed state.

[Effect of idea]

According to the present invention, the first main coil for moving the plunger in the opening direction and the auxiliary coil for moving the plunger in the closing direction are disposed on the outside of the plunger, and the first permanent magnet and the polarity are arranged on both outsides thereof. By disposing second permanent magnets that are reversible and making the second permanent magnets have the same phase as the first permanent magnet, the magnetic flux of these permanent magnets will not act on the plunger, and the spring will move the plunger in the closing direction. On the other hand, if the phase is reversed, the magnetic flux of these permanent magnets acts on the plunger and can bias the plunger in the opening direction. Therefore, even if the coil is de-energized, the valve remains open. Moreover, because of the structure in which the first and second permanent magnets are arranged on the sides of the first main coil and the auxiliary coil, it can be used even when the moving stroke of the plunger is short. Both the valve opening/closing mechanism and the valve body can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the solenoid valve of the present invention, Fig. 2 is a sectional view showing its wiring state, Fig. 3 is a sectional view showing the magnetic flux circuit in the closed state of the solenoid valve, and Fig. 4 is a sectional view showing an embodiment of the solenoid valve of the present invention. The figure is a sectional view showing the magnetic flux circuit when the solenoid valve is open, and FIG. 5 is a sectional view showing the magnetic flux circuit when the auxiliary coil is excited. 18... Valve seat, 21... Plunger, 22...
Valve body, 23... Spring, 26... First main coil, 27... Auxiliary coil, 30... First permanent magnet, 33... Second permanent magnet, 36... Second main coil.

Claims (1)

[Scope of Claim for Utility Model Registration] A plunger having a valve body that opens and closes a valve seat; A spring that biases this plunger in the closing direction; A spring that is disposed on the outside of the plunger and moves the plunger in the opening direction when excited. a first main coil; a first main coil that is disposed on one side of the first main coil and that generates a magnetic flux that biases the plunger in the opening direction;
and a permanent magnet disposed on the other side of the first main coil, the polarity of which is reversed depending on the direction of the magnetic flux received from the outside and changes to the same phase or the opposite phase to the magnetic flux direction of the first permanent magnet. a second permanent magnet disposed outside the second permanent magnet and excited together with the first main coil to cause the polarity of the second permanent magnet to be opposite to the magnetic flux direction of the first permanent magnet. a second main coil that is inverted so that the phase is inverted;
An auxiliary coil for reversing the polarity of the permanent magnet so that it is in phase with the magnetic flux direction of the first permanent magnet.