JPH0559308B2 - - Google Patents

Description

[Detailed Description of the Invention] [Subject of the Invention] The present invention relates to an electromagnetic rotary valve device, and more specifically, an electromagnetic rotary valve that proportionally controls the flow rate of fluid by a rotary valve that rotates in response to electromagnetic force. It is related to the device.

[Field of application of the present invention]

The electromagnetic rotary valve device described above can control the communication flow rate of fluid between the input and output ports with a relatively high precision relative to the applied current value. It is used in valve devices such as purification systems that require extremely high precision and ensuring proportionality in the entire control range from small flow rates to large flow rates.

[Prior art]

Conventionally, this type of rotary valve device was manufactured by, for example,
As disclosed in Japanese Patent No. 56-113874, the motor section that generates electromagnetic force and the valve section that controls the flow rate of fluid have an integrated structure, that is, both the motor section and the valve section are housed in one housing. It was configured to be set up. Therefore, approximately 180
Since the valve part is directly affected by high heat around ℃, it is necessary to use a heat-resistant resin or metal material for the coil holding member. In addition, in the motor section, since it is necessary to generate a parallel magnetic field on the magnet concentric with the valve rotor, there is no flexibility in the arrangement of the coil section, which deteriorates the winding efficiency of the coil and furthermore, the shape It is complicated and increases manufacturing costs.

Therefore, in view of the problems of the conventional rotary valve device described above, in order to prevent the effects of high heat generated from the coil from reaching the valve section, the present applicant's earlier application was filed in 1983. A valve device disclosed in No.-15041 has been proposed. This valve device includes a solenoid composed of a bobbin and a coil, a center core disposed at the center of the solenoid, a magnetic yoke coupled to the center core at one end and having a magnet placement hole at the other end. an L-shaped yoke coupled to the magnet yoke and the inner core; a valve housing fixed by both yokes and having a pair of input/output ports; and a valve housing press-fitted into the center of the valve housing and each located at a position corresponding to the input/output port. This structure includes a valve cylinder having an opening, a rotary valve rotatably disposed in the valve cylinder, and a magnet fixed to one end of the rotary valve and located in the magnet placement hole.

[Problems with conventional technology and their technical analysis]

In the valve device disclosed in the above-mentioned Application No. 15041/1980, the rotary valve is constantly urged to rotate by a spring, one end of which is engaged with a groove of the rotary valve, and the other end of the spring is engaged with a groove of the rotary valve. was a cylindrical torsion spring fitted into a protrusion of a spring holder. Therefore, as the valve rotates, the fitting portion of the spring with the valve receives a force so as to move in the direction of the groove, and the outer diameter portion of the spring comes into contact with the inner diameter portion of the spring holder. On the other hand, if the tip of the spring is crimped to the rotary valve so that it does not move, if the spring crimped portion deviates from the center, the spring constant will act at a value different from the designed spring constant. In addition, with cylindrical torsion springs, there is contact between the lines as the spring expands and contracts, and in either case, this causes operational hysteresis in the rotary valve, making it necessary to accurately and reliably control the fluid flow rate in response to the input current value. I couldn't do it.

[Technical issues]

Therefore, the technical object of the present invention is to reduce the hysteresis of a rotary valve.

[Technical Means] The technical means taken to solve the above technical problem are: a solenoid consisting of a bobbin and a coil; a center core disposed at the center of the solenoid; A magnet yoke that has a hole for magnet placement in its part, an L-shaped yoke that is combined with the magnet yoke and center core, a valve housing that is fixed to both yokes and has a pair of input and output ports, and a valve housing that is press-fitted into the center of the valve housing. a fixed valve cylinder having openings at positions corresponding to the input and output ports of the valve housing; a rotary valve rotatably arranged in the valve cylinder and having a through hole in the center; In an electromagnetic rotary valve device equipped with a magnet located in a magnet placement hole, a small diameter end is housed in a slotted groove formed at the other end of the rotary valve, and the small diameter end is housed in the slotted groove formed at the other end of the rotary valve. A conical torsion spring biased in a direction opposite to the rotational direction, a spring holder having an outer circumferential groove for accommodating a large diameter end of the torsion spring, and a protrusion that fits into a recess formed in the spring holder, and is integrated with the spring holder. The valve cylinder is provided with an adjuster that is rotatable and movable in the axial direction, and a stopper formed on the valve cylinder so as to lock the tip of the small diameter end of the torsion spring.

[Effect of technical means]

Since a stopper is formed on the valve cylinder at the tip of the small diameter end of the torsion spring, the small diameter end of the spring is prevented from moving in the direction of the groove as the valve rotates, and the outer periphery of the spring is prevented from contacting the spring holder. It is also possible to prevent contact between the wires when the spring expands and contracts. Therefore, contact of the outer peripheral portion of the torsion spring with the spring holder and contact between the lines of the spring are respectively prevented, and it is possible to reduce the operating hysteresis of the rotary valve.

[Special effects produced by the present invention]

If a cylindrical torsion spring is made without contact between the wires, the installation space for the spring will be large, but by using a conical torsion spring, the installation space will not be large, and in terms of spring installation space. It's advantageous. Furthermore, since the spring is conical, the centering of the spring is stable even when the valve is twisted during rotation. Furthermore, since the large diameter end of the spring is inserted into the outer groove of the spring holder, the spring can be easily installed by hand without the need for tools.
Spring assembly work efficiency is greatly improved.

〔Example〕

An embodiment embodying the technical means of the present invention will be described in detail below with reference to the accompanying drawings.

In the electromagnetic rotary valve device 10 shown in FIG.
A center core 14 made of a magnetic material is disposed at the center of the solenoid 13. A magnet placement hole 15a is formed at one end 14a of the center core 14 and at the other end of the magnetic yoke 15. Magnetic yoke 15 and the other end 14b of the center core 14
An L-shaped yoke 16 is coupled to the L-shaped yoke 16, the magnetic yoke 15, and the center core 1.
4. A magnetic circuit is formed by the solenoid 13.

A valve housing 19 having a pair of input ports 17 and output ports 18 shown in FIG. 2 is fixed by the yokes 15 and 16. A resin valve cylinder 20 press-fitted into the center of the valve housing 19 and fixed by caulking is rotatably arranged in the valve cylinder 20 having openings 21 and 22 at positions corresponding to the input and output ports 17 and 18. The rotary valve 23 has an elliptical through hole 24 in the center, and a thrust stopper 25 and a magnet mounting flange 26 at one end.
The other end portions each have a slotted groove 27 for storing a spring. A donut-shaped magnet 28 is magnetized in the radial direction at the left end of the rotary valve 23, that is, between the stopper 25 and the flange 26, and at the same time, the magnet 28 is magnetized in the magnet placement hole 15a of the magnetic yoke 15. is located. Non-magnetic cap 29 fixed to magnetic yoke 15
The opening end on the right side in the figure is the valve cylinder 19.
It serves both as centering of the magnet placement hole 15a and as an external seal.

The torsion spring 29 that rotationally biases the rotary valve 23 is a conical coil spring having ineffective portions corresponding to end turns at both ends. That is, spring 2
The small diameter end 29a of the valve 9 is housed in the slotted groove 27 of the first valve 23, and the straight end turn portion 29b is also placed on the valve 23, and its tip is locked to a stopper 20a formed on the valve cylinder 20. . On the other hand, the large diameter end 29c of the spring 29 has a large diameter corner end portion 29d at its tip. The large winding portion 29d
Outer circumferential groove 30a formed in resin spring holder 30
The projection 31a (shown in FIG. 8) of the resin adjuster 31 is fitted into the rotation recess 30b (shown in FIG. 6) formed in the holder 30, so that the adjuster 31 and the holder 30 rotate together and become movable in the axial direction, and the spring 29
The mounting load can be set arbitrarily within a predetermined range. The adjuster 31 has an O-ring 3 in the outer circumferential groove 31b.
2 is inserted, and a driver groove 31c is formed in the flat part.

Now, the operation of the valve device having the above configuration will be explained next.

When an electric signal is sent to the coil 12 of the solenoid 13 and electricity is supplied, a magnetic circuit is formed by the coil 12, the center core 14, the magnetic yoke 15, and the L-shaped yoke 16, and the coil 12 is located in this magnetic circuit. A rotating force is applied to the magnet 28.
As the magnet 28 rotates, the rotary valve 23 rotates against the urging force of the spring 29. When the rotary valve 23 is held in the position shown in FIG.
22 respectively, and thus between the input port 17 and the output port 18. At this time, rotary valve 2
3 rotates against the biasing force of the spring 29 is proportional to the input current value received by the coil 12.
The communication area between the through hole 24 and both openings 21 and 22 is controlled in proportion to the input current value. That is, the fluid communication flow rate between the input port 17 and the output port is proportionally controlled according to the current value applied to the coil 12.

[Brief explanation of drawings]

1 is a sectional view showing an embodiment of the device according to the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a plan view of the conical torsion spring in FIG. 1, and FIG. The figure is a sectional view taken along line B-B in Figure 3, Figure 5 is a plan view of the spring holder in Figure 1, Figure 6 is a sectional view taken along CC in Figure 5, and Figure 7 is a plane view of the adjuster in Figure 1. 8 is a sectional view taken along line DD in FIG. 7. 10... Electromagnetic rotary valve device, 11... Bobbin, 12... Coil, 13... Solenoid, 14
... Center core, 15 ... Magnetic yoke, 1
5a... Hole for magnet placement, 16... L-shaped yoke, 17... Input port, 18... Output port, 19... Valve housing, 20... Valve cylinder, 20a... Stopper, 21, 22...
Opening, 23... rotary valve, 24... through hole,
27...Slotted groove, 28...Magnet, 29
. . . Coco-shaped torsion spring, 29a . . . Small diameter end of the spring, 29b . . . End winding portion of the spring, 29c
...Large diameter end of the spring, 29d...Large diameter corner end portion of the spring, 30...Spring holder, 30a...Outer circumferential groove,
30b... recess, 31... adjuster, 31a...
…protrusion.

Claims (1)

[Claims] 1. A solenoid composed of a bobbin and a coil;
A center core disposed at the center of the solenoid, a magnet yoke coupled to the center core at one end and having a magnet placement hole at the other end, and an L-shaped yoke coupled to the magnet yoke and the center core. , a valve housing fixed to both the yokes and having a pair of input/output ports; a valve cylinder press-fitted into the center of the valve housing and having openings at positions corresponding to the input/output ports of the valve housing; and the valve. In the electromagnetic rotary valve device, the electromagnetic rotary valve device includes a rotary valve rotatably arranged in a cylinder and having a through hole in the center, and a magnet fixed to one end of the rotary valve and located in the magnet placement hole. a conical torsion spring whose small diameter end is accommodated in a slotted groove formed at the other end of the rotary valve, and which urges the rotary valve in a direction opposite to the rotational direction; and a large diameter of the torsion spring. a spring holder having an outer circumferential groove for accommodating the end; an adjuster having a protrusion that fits into a recess formed in the spring holder; an adjuster that rotates together with the spring holder and is movable in the axial direction; and a small diameter end of the torsion spring. An electromagnetic rotary valve device comprising: a stopper formed on the valve cylinder so as to lock the tip thereof.