JPS6347578A - Step drive type fluid control valve - Google Patents

Abstract

PURPOSE:To eliminate a torque loss due to rotational resistance, by driving a spool with a magnet disc for rotation in a state of being separated from plural pieces of coils by a separation wall. CONSTITUTION:A cylindrical spool is provided with a bore 2, while it forms a bottomed cylindrical bore 4 extending in an axial direction inside, constituting a first valve part 5. A permanent magnet 6a is set up rotatably as one body concentrically, and there are provided with six pieces of both N and S poles alternately in the circumferential direction. A passage 9 piercing a radial wall part is formed in a small diametral part 8 of a housing, constituting a second valve part 10 which is properly interconnectible to the bore 2 and controls a fluid flow rate. The permanent magnet 6a and plural coils 15 and 19 are separated in a state of being opposed to each other, so that a plate 21 as a separation wall is interposed between them.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a step drive method in which the pressure and flow 54 of the liquid are obtained stepwise by 1tIllmL by driving the spool with a magnet and controlling the flow path of the fluid. Regarding the formula fluid I11 valve.

[Prior Art] Conventionally, there is a fluid control valve that controls the pressure, flow rate, etc. of a fluid in a stepwise manner, and a step motor is used to drive a spool. This step motor has a plurality of coils on an annular stator core, and is configured to actuate a spool by sequentially energizing the coils with pulses. However, this step motor has a complicated structure and occupies a larger space than the spool, resulting in the disadvantage that the entire fluid aI control valve becomes larger. However, since the step-9 requires a seal mechanism at the rotational connection between the step motor and the spool in order to prevent contamination or immersion in the fluid, the seal resistance of the seal R1m causes torque loss in the spool, resulting in savings. The drawback is that it cannot be converted to electricity. Further, the orange seal structure may cause fluid leakage due to seal failure or seal wear, which is a problem that must be solved in practice.

[Objective of the Invention 1] The present invention aims to solve the above-mentioned problem, and aims to improve the fluid control ability by driving and controlling the spool with high precision, and has a simpler configuration than the conventional step motor. transformation,
Ensures reliability and durability, overcomes fluid leakage, achieves miniaturization, #V quantity, and low cost, and eliminates torque loss to the spool by eliminating the need for a seal mechanism in the rotating part. An object of the present invention is to provide a step drive type fluid υ1911 valve which is designed to save power.

[Structure of the Invention] The step-driven fluid tjJ II valve of the present invention includes a spool having a first valve portion that controls the flow rate of fluid, and a N pole fixed coaxially with the spool and a N pole in the circumferential direction. A magnetic disc in which south poles are arranged alternately, a spool hole that rotatably and slidably accommodates the spool, a second valve part that controls the fluid flow rate together with the first valve part of the spool, and the magnetic disc. a plurality of coils arranged in the circumferential direction facing the magnetic disk; and a plurality of coils interposed between the magnetic disk and the plurality of coils. The structure includes a non-magnetic isolation wall that isolates the coil from the disk chamber.

With this configuration, the spool is rotated while being separated from the plurality of coils by the separating wall. For this reason, the spool does not require a sealing mechanism on the rotating part.
Torque loss due to rotational resistance caused by the seal mechanism can be eliminated.

The step-driven fluid control valve of the present invention controls the pressure and flow rate of gas, liquid, etc. by 1.11 all.

The spool is cylindrical in shape and has at least one radially extending groove or bore at one end. This groove or lumen constitutes a first valve portion that controls fluid flow. The first valve portion can allow flow mi, II @ not only in one direction but in multiple directions.

The magnet disk induces polarization and is made of cast magnets, sintered magnets, rubber magnets, etc. The magnetic disk may be integrally connected to the spool, or the spool itself may be a magnetic spool made of a magnet. Moreover, the shape of the magnetic disc may be modified in various ways. For example, it can have a ring shape.

The housing accommodates the spool and the magnetic disc in a manner that allows for free movement with good airtightness, and together with the first valve part of the spool constitutes a second valve part that controls the flow rate of the fluid. Flow rate not only in one direction but in multiple directions1IIJiII
can be made possible.

The plurality of coils are magnetically polarized by energization, and the opposing magnetic poles of the adjacent magnets are energized! ! The spool is rotated by inductive attraction or repulsion. The coil can be an electrically conductive coil such as a printed coil, and the magnets and the magnets are arranged facing each other in the axial direction of the spool through a partition wall (described later), and are arranged concentrically in the radial direction of the spool through a partition wall (described later). It is also possible to arrange them oppositely in a ring.

Further, the magnet and the coil may each have a different combination configuration such as 4 poles and 6 poles, 4 poles and 8 poles, 6 poles and 8 poles, or 5 poles and 6 poles, 7 poles and 8 poles, etc.

The rotational drive amount of the spool is determined by the magnetic logarithm of the magnet and the coil, and can be easily arbitrarily changed by appropriately selecting and combining these conditions.

Further, the plurality of coils are electrically connected via a controller or the like as an electric circuit.

Furthermore, by making the plurality of coils of a printed type and embedding them in the plastic plate serving as the partition wall, it is possible to construct the coils to be extremely thin, thereby further reducing the size and weight.

In addition, since the cover has a structure in which the coil and the partition wall are integrally molded with resin, various durability such as heat dissipation, water resistance, oil resistance, etc. can be increased, and the cover can also be made smaller and lighter. be able to.

As the non-magnetic isolation wall, a plate-shaped isolation wall made of non-magnetic material such as plastic, ceramic, copper, aluminum, zinc, etc. can be used.

By interposing this separation wall between the magnet and the coil, the spool and magnet disc are kept confidential within the housing to prevent fluid leakage, and together with the cover, the separation wall prevents the fluid in the coil from leaking. It is possible to ensure prevention of contamination and immersion.

[Operations and Effects of the Invention] According to the configuration of the step-driven fluid tIJ III valve of the present invention, a set of 211 coils at opposing positions is connected to a DC power source via a controller, and currents in opposite directions are applied to the step timing. , and sequentially energizes adjacent coils in one clockwise or counterclockwise direction to form a magnetic field and electromagnetically induce the magnetic disk interposed between the partition walls to displace it to a predetermined rotation angle, The seventh valve portion of the spool can be quickly, stably, and smoothly rotated and spun to a desired position. As a result, the first valve part of the spool is efficiently displaced relative to the second valve part of the fixed housing, and the flow passages in both valve parts are opened and closed to control the fluid flow rate with high precision. can do.

Furthermore, the step drive type fluid control of the present invention [#] efficiently connects the spool and the magnet circle by disposing FB'EJ in a disk configuration that alternately induces polarization in the circumferential direction of the spool as a valve member. The board can be rotated together.

Moreover, the spool as the valve member and the magnetic disc as the drive unit can be connected compactly.
Rotates with the spool like a conventional step motor #8
It is no longer necessary to equip the sealing mechanism on the spool, which not only eliminates torque loss to the spool and saves power, but also eliminates wear of the sealing member (drastically improving durability. The coil becomes magnetic when energized, and can electromagnetically attract the opposing magnetic poles of the adjacent magnets to drive the spool to rotate a predetermined number of times. The magnet and spool are separated and separated from each other with good airtightness, thereby reliably preventing contamination or immersion of the coil in the fluid.Furthermore, the magnet and spool are separated and separated within the housing with good airtightness. By storing the housing in the housing, leakage of fluid from the inside of the housing to the inside of the cover or outside can be reliably prevented.

Therefore, the fluid 11i+1 wJ valve of the present invention has a simpler configuration compared to conventional step motors, can ensure reliability and durability, and has numerous advantages such as smaller size, lighter weight, and lower cost. It has practical effects. , [Example] The present invention will be explained below with reference to a typical example shown in FIGS. 1 to 8.

Figures 1 and 2 show the structure of the hydraulic i, lI tall valve of this embodiment, in which a cylindrical spool 1 has a slit-shaped inner cavity 2 passing through it in the radial direction at one end, and A reinforcing ring 3 is integrally connected to the inner cavity 4, which forms a cylindrical inner cavity 4 with a bottom that extends in the axial direction, and the slit-shaped inner cavity I! ! 2 and controls the fluid flow ω.
It constitutes the valve part 5. Further, at the other end of the spool 1, as shown in FIGS. 3 and 4, a permanent magnet 6a such as a ferrite magnet is coaxially rotatable as a unit, and six pieces of Ni and SvM are arranged alternately in the circumferential direction. It is arranged in a disk shape as a whole. Further, the hollow cylindrical housing 7 shown in FIG. 1 has a different diameter inner cavity formed of a small diameter part 8 and a large diameter part 11 inside. The small diameter portion 8 is the spool 1
is rotatably housed with good confidentiality. A second valve part 10 is formed in the small diameter part 8 and has a flow passage 9 penetrating through the wall in the radial direction, and can communicate with the slit-like lumen 2 of the spool 1 as appropriate to control the fluid flow rate. It consists of

Further, inside the large diameter portion 11, a disk chamber 12 is formed to accommodate the magnet disk 6 of the spool 1. The eight coils 13, 14, 15, 16, 17, 18, 19, 20 are all right-handed with a predetermined number of turns as shown in Figure 5.
It! The induction coils are arranged circumferentially and in the direction of the plate 21 facing the magnetic disk 6. In order to isolate the magnetic disk 6 and the plurality of coils 13 to 20 while facing each other in the axial direction of the spool 1, a plate 21 as a separating wall made of a non-magnetic material such as plastic is interposed between them. are doing. With this, coil 1
3 to 20 are isolated from the disk chamber 12. The plate 21
is attached to the housing 7 with an O-ring 22 as a fixed sealing member interposed between the housing 7 and the whole disc 12 to maintain the airtightness of the disc chamber 12 well. In addition, the plate 21 has a cover 2 made of resin material on the side where the coils 13 to 20 are attached.
3, and the cover 23 is integrally attached to the housing 7 together with the plate 21 to enclose the coils 13-20. The coils 13 to 20 are connected to their respective terminals A so as to be able to ii!
-P is connected to each terminal of the controller CPU as shown in FIG. 6, and can be electrically connected to the DC power supply 24 as appropriate.

The hydraulic &+111 valve of this embodiment having the above-mentioned configuration has a plurality of coils 1 connected to the power source 24 via the controller CPU.
A magnetic field is formed by sequentially passing a direct current in a clockwise or counterclockwise direction so that the coils of 2 g and 1 A are placed in opposite positions among the coils of 3 to 20 and have opposite polarities. This is expressed as 1I in hydraulic pressure 1 control ll valve.
Taking as an example FIG. 7 showing the relative position between the coil and magnet disk 6 of IJ ill liJ and FIG. 8 showing the relative position between the coil and magnet disk 6 after t11 control, the outer circumferential side in the figure is The magnetic poles corresponding to the magnetic poles of the plurality of coils 13 to 20 and the magnet disk 6 are shown as J0, and the inner circumferential side shows the magnetic poles of the magnet disk 6, respectively. In this embodiment, two of the eight coils are placed opposite to each other, and a plurality of coils 1 are used as a group.
By sequentially switching the exciting coils from 3 and 17 to 14 and 18, and maintaining the current direction inverted,
The magnetic disk 6 is electromagnetically induced to rotate the phase by 15 degrees from FIG. 7 to FIG. 8. Thereby, the first valve portion 5 of the spool 1 can be quickly, stably, and smoothly rotated to a predetermined position inside the small diameter portion 8 of the housing 7. Therefore, the first valve part 5 of the spool 1 is displaced relative to the second valve part 10 of the fixed housing 7, and both valve parts 5.1
IFOrRl it/J tin L
The flow rate of the fluid can be controlled with high precision, and the hydraulic pressure of the fluid can be controlled to a predetermined value.

Also, Honji II! lW4 hydraulic pressure! In the IIJ till valve, magnets 6a are arranged alternately in a disc configuration in the circumferential direction of the spool 1 having the first valve part 5, so the spool 1 and the magnet disc 6 can be rotated together, and both The compact design reduces torque loss and saves power.

Roughly speaking, each of the plurality of coils 13 to 20 is energized to excite the adjacent magnetic disc 7, thereby enabling the spool 1 to be accurately driven at a predetermined rotation angle. Moreover, the coil 13~
Since the coils 20 can be isolated from the magnet disk 6 and the spool 1 separately and with good airtightness via the plate 21, it is possible to eliminate inconveniences such as contamination or immersion of the coils 13 to 20 in the fluid. In addition, the magnet disk 6 and the spool 1
Because it can be stored in the housing 7 with good mv property by the plate 21, it can be stored from inside the housing 7 to the outside or the cover 23.
This has the effect of accurately preventing fluid from leaking into the interior.

In this way, the hydraulic υ1rs valve of this embodiment has a simple configuration,
Reliability and durability can be ensured, and furthermore, it has practical effects such as reduction in size, weight, and cost.

[Brief explanation of the drawing]

1 to 8 each show an embodiment of the present invention, so FIG. 1 is a longitudinal sectional view of the hydraulic control valve of the embodiment, and FIG. 2 is taken along line I-1 in FIG. 1. 3 is a perspective view showing the spool and magnet disk of this embodiment, FIG. 4 is a plan view of the magnet disk, and FIG. 5 is a diagram showing how a plurality of coils are arranged on the plate. A plan view, and FIG. 6 is a circuit diagram showing the connection status between the terminals of multiple coils and the controller and power source.
FIGS. 7 and 8 are explanatory diagrams showing the operating conditions of the coil and the magnetic disk. In the figure, 1... Spool 5... First valve part 6...
・Magnet disc 6a...Magnet 7...Housing 10...Second valve part 12...Disc chambers 13-20...
・Multiple i coils 21...Plate 22...0 ring 23...Cover 24 Power supply Patent applicant Omada Koki Co., Ltd. Agent Patent attorney Hiroshi Okawa Agent Patent attorney Akio Maruyama Figure 7 Figure 8 figure

Claims (2)

[Claims] (1) A spool that has a first valve part that controls the flow rate of fluid, a magnetic disk that is fixed coaxially with the spool and has N poles and S poles arranged alternately in the circumferential direction, and rotates the spool. a housing having a spool hole that slidably accommodates the spool, a second valve section that controls fluid flow rate together with the first valve section of the spool, and a disk chamber that accommodates the magnetic disk; It is composed of a plurality of coils arranged in the direction, and a non-magnetic isolation wall interposed between the magnetic disk and the plurality of coils and separating the plurality of coils from the disk chamber. Features a step-driven fluid control valve. (2) The step drive type fluid control valve according to claim 1, wherein the magnet disk is constituted by a plurality of magnets having N poles and S poles arranged alternately at equal intervals in the circumferential direction.