JPS6347573A - Valve - Google Patents

Abstract

PURPOSE:To aim at improvement in durability as well as to prevent a handling fluid from contamination, by keeping off the occurrence of abrasive powder due to solid contact, in case of a flow regulating valve for a liquid 1 of a medicine or the like. CONSTITUTION:At least one kind of materials selected out of a permanent magnet, conductive materials or hysteretic materials is buried in a valve body 22, and this valve body 22 is made rotatable at an optical position by a rotating magnetic field. And, each dynamic pressure generating groove is formed in either of surfaces, where the valve body and a partition wall 1c or the member locked to this partition wall 1c are opposed to each other, and also either of surfaces, where the valve body 22 and a part of a position adjusting mechanism of the valve body 22 are opposed to each other. With this constitution, solid contact is in no case entailed there, therefore durability is improved, and contamination of a handling fluid is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to pulp, and in particular provides a pulp suitable for preventing contamination of liquids such as ultrapure water and pharmaceuticals.

[Prior Art] Conventionally, as a means to reduce the flow rate of fluid flowing through a pipe to 1,
Pulp is used. There are various types of valves such as gate valves, globe valves, angle valves, check valves, cocks, ball valves, and plug valves.

Figure 6 shows the conventional screw-in globe valve LJIS B2011.
(see). A valve box 1 is provided with a fluid inlet 1a and an outlet 1b, and a threaded portion for piping is formed in the inlet 1a and the outlet 1b. A JX valve 2A is screwed into the upper part of the valve box 1, and a valve body 7A is disposed to pass through the axis of the lid 2A. A handle wheel 8 is fixed to one end of the valve stem 7△ by a nut 9, and a single presser 4A is fixed to the other end □. Further, a threaded portion 7a is formed at an intermediate position of the valve stem 7Δ, and is screwed into a threaded portion 2a formed on the lid 2A, so that when the handle wheel 8 rotates, the valve stem 7a is formed.
A rotates and moves up and down.

The valve body 3 is screwed into the single presser 4A, and the outer periphery 3a of the valve body 3
The flow rate of the fluid is changed by adjusting the distance between the opening 1d of the partition wall 1c formed inside the valve box 1 using the handle wheel 8.

A packing 10 and a packing retaining ring 5 are housed in the upper part of the lid 2A, and are pressed by a packing retaining nut 6 to seal the valve stem 7A and the penetrating portion of the lid 2A.

[Problems to be Solved by the Invention] This type of valve reduces the opening area of the flow path by moving the valve body 3 toward or away from the opening 1d formed in the partition wall 1C in the valve box 1. and adjust the fluid flow m.

Therefore, when blocking the flow, the valve body 3 is pressed against the opening 1d, and the opening 1d is completely closed by the valve body 3. Therefore, when blocking the flow, always use the valve body 3.
A solid contact was made at the opening 1d and a small amount of abrasion powder was generated at this time. That is, each time the valve is opened and closed, abrasion powder is generated in the valve body 3, threaded parts 2a, 7a, shaft seal part, seal retaining ring 5, etc., and when the fluid to be handled is ultrapure water, pharmaceuticals, etc. The fluid was severely contaminated by the operation of the Therefore, in this type of field, the number of valves installed should be minimized, or
Alternatively, it is common to use a valve made of ceramics, which has significantly less wear due to sliding.

However, the former has the disadvantage of not being able to adequately control the flow rate, and the latter requires expensive valves, and basically prevents the generation of abrasion powder from solid contact parts. isn't it.

[Object of the invention] The present invention has been made in view of the above-mentioned problems.
To provide a valve that prevents the generation of abrasion powder during valve operation, has excellent durability, and has a relatively simple structure.

[Means for Solving the Problems] According to the present invention, a partition wall that partitions a fluid passage is formed with an opening for the fluid to pass therethrough, and a partition wall that is selected from a permanent magnet, a conductive material, or a hysteretic material. a valve body in which a member made of at least one kind of material is embedded and is rotatable at an arbitrary position facing the opening; a position adjustment mechanism that adjusts a gap between the body and the partition wall, one of the surfaces where the valve body and the partition wall or a member fixed to the partition wall face each other, and the valve body A groove for generating dynamic pressure is formed on one of the opposing surfaces of the position adjustment mechanism and a part of the position adjustment mechanism.

[Operations and Effects of the Invention] The valve of the present invention has a member made of at least one material selected from a permanent magnet, a conductive material, and a hysteresis material embedded in a valve body disposed opposite to an opening through which fluid passes. The valve body can be rotated at any position by a rotating magnetic field, and the valve body and the valve can be rotated at any one of the surfaces where the valve body and the partition wall or the member fixed to the partition wall face each other. Since a groove for generating dynamic pressure is formed on one of the surfaces facing the part of the body position adjustment mechanism, the valve body can be fixed to the partition wall or the partition wall by rotating the valve body. Fluid dynamic pressure is generated between the valve body and a part of the position adjustment mechanism, respectively, and the gap between the valve body and the partition wall or the member fixed to the partition wall becomes extremely small. Even in the case of solid-state contact, there is no solid contact due to the dynamic pressure of the fluid.

That is, in the valve of the present invention, when adjusting the flow rate of fluid, since there is no solid contact, no abrasion powder is generated, and therefore it is suitable as a valve for handling clean liquids such as ultrapure water and pharmaceuticals.

[Preferred Embodiment] For carrying out the present invention, the combination of the rotating magnetic field generating means and the member embedded in the valve body that rotates in synchronization with the rotating magnetic field is a laminated sheet coil and a permanent magnet, or a conductive material, Alternatively, a member formed from a hysteretic material is preferable, and a magnetic coupling between permanent magnets, gi1
A synchronous magnetic coupling between a stone and a permanent magnet or a known magnetic coupling is preferred.

When carrying out the present invention, the valve body position adjustment mechanism may be a manual type, an electric type, a hydraulic type, or a pneumatic type; Alternatively, a hydraulic type is better.

When carrying out the present invention, the valve body and the member whose surface faces the valve body are made of a hard ceramic material, such as Si
It is preferable to use C, Si3 N4, An203, or the like. In this way, corrosion resistance against fluid flow and durability against slurry can be improved.

In carrying out the present invention, the surface of the valve body and the member whose surface faces the valve body is formed into a smooth flat surface with a waviness of 1 μm or less and a surface roughness of 1 (Rmax) or less. is preferred.

In carrying out the present invention, the groove for generating dynamic pressure is formed in a spiral shape or a herringbone shape, and the land portion of the member made of the hard ceramic material is coated with a synthetic resin, and the groove is formed to a depth of 3 to 50 μm by shot blasting. It is preferable to form it in a straight line.

In carrying out the present invention, the shape of the valve body is preferably a disk, but it is also preferable to form it into a cone. In the case of a conical shape, the groove for generating dynamic pressure causes a flow from the downstream side toward the upper FRm, and the flow can be blocked by making 2 to 1 nodes, and the outflow can also be finely adjusted. be able to.

When implementing the present invention, it is preferable to provide a bellows between the valve body side of the position adjustment mechanism and the lid of the valve body. In this way, it is possible to prevent the liquid from leaking into the solid contact portion and contaminating it with abrasion powder.

[Example] The present invention will be described in detail below with reference to the drawings.

Portions in FIG. 1 that correspond to those in FIG. 6 are given the same reference numerals and redundant explanation will be omitted.

In FIG. 1, a valve seat 20 made of an annular hard ceramic material is integrally fixed to the wall surface on the outlet side of the opening 1d of the partition wall 1c, and an opening 21 is also formed in the center of the valve seat 20. 1d and 21 form an opening through which fluid passes. Note that 22 is a valve body 22 in which a permanent magnet 23 is embedded, the details of which will be described later.

A lid 2 is screwed onto the upper part of the valve cylinder 1, and a valve rod 7 is disposed to pass through the axis of the lid 2. The tip of the valve rod 7 is attached to a fixing plate 4C of a presser foot 4, which will be described later. It is in contact. The valve stem 7, handle wheel 8, threaded parts 7a, 2a, and presser foot 4 constitute a position adjustment mechanism for the valve body 22, and the inner peripheral surface of the threaded part 2b of the lid 2 is made of synthetic resin. The outer peripheral surface of one end of the bellows 24 is fixed with adhesive.

The presser foot 4 includes a sliding plate 4a facing the valve body 22, a stator 4b adhered to the upper surface of the sliding plate 4a, and a stator 4b.
a fixing plate 4C that holds the bottom of the bellows 24 between;
It consists of a stator 4b, a bellows 24, and a pin 4d that integrally connects a fixed plate 4C.

The sliding plate 4a is made of a hard ceramic material, the stator 4b is formed by laminating sheet coils, and the lead wire 2b fixed to the fixed plate 4C is inserted into the through hole 2C provided in the lid 2.
It is connected to an external power supply (not shown) through the The stator 4b is configured to generate a rotating magnetic field (including an alternating magnetic field) by being supplied with power from a power source, and constitutes a rotating magnetic field generating means of the position adjustment mechanism.

The inner peripheral surface of the bellows 24 on the stator 4b side is connected to the stator 4b.
Therefore, the bellows 24 is bonded to the adhesive part on the threaded part 2b side, and liquid leaks into the threaded part of the threaded parts 2a and 7a and the seal retaining ring 5, thereby preventing contamination by abrasion powder. It is designed to prevent

In FIGS. 2(a) and 2(b), the valve body 22 is composed of a disk-shaped permanent magnet 23, and an upper surface plate 28 and a lower surface plate 27 each made of a hard ceramic material and covering the permanent magnet 23. , are mutually glued and integrated. The permanent magnet 23 includes a plurality of magnets (six in the illustrated example) in the circumferential direction.
The magnetic poles N and S are alternately magnetized by dividing them into equal parts. Note that 22a indicates the upper surface of the valve body 22, and 22b indicates the lower surface.

FIG. 3(a) shows the side 2 of the valve seat 20 facing the valve body 22.
0a is shown. The surface 20a has a total waviness of 1 μm.
It is formed into a smooth plane with a surface roughness (Rmax) of 1 μm or less.

FIG. 3(b) shows the lower surface 22b of the valve body 22, and in the illustrated example for generating a plurality of dynamic pressures, a spiral groove 30 (black part) that expands in the clockwise direction A when viewed from below in the axial direction is formed. ing. The depth of this groove 30 is 3 to 50 μm, and the entire surface of the adjacent land 31 is formed with waviness of 1 μm or less and surface roughness (Rmax) of 1 μm or less. Note that the circle indicated by the two-dot chain line in the central land 31a indicates the outer shape of the circle corresponding to the opening 21 of the valve seat 20. The land portion of the spiral 1j130 is coated with a synthetic resin and processed to the depth by shot blasting.

FIG. 3(C) shows the upper surface 22a of the valve body 22, and the lower surface 22a of the valve body 22.
Spiral grooves 30 and lands 31 similar to those in b are formed, and a portion (black circle portion) 33 corresponding to the land 31a on the lower surface 22b is a pressure equalizing portion formed at the same depth as the groove 30.

FIG. 3(d) shows the surface of the sliding plate 4a facing the valve body 22, and the surface roughness (R) is n and waviness is 1 μm or less.
max) is formed on a smooth surface with a side of 1 μm or less.

Next, the effect will be explained.

When power is supplied from the lead wire 26 to the stator 4b, the stator 4b
A rotating magnetic field is generated along a plane substantially perpendicular to the axial direction of the valve stem 7, and the valve body 22 rotates in the direction of the arrow in synchronization with the rotating magnetic field. As the valve body 22 rotates, the fluid is forced into the center by the spiral groove 30 for generating dynamic pressure and dynamic pressure of the fluid is generated, so that the sliding plate 4a and the valve body 22 do not come into solid contact. . Furthermore, when the valve is wide open, dynamic pressure is generated only between the valve body 22 and the sliding plate 4a, and virtually no dynamic pressure is generated between the valve body 22 and the valve seat 20. When the valve body 22 is located close to the valve seat 20, dynamic pressure is also generated between the valve body 22 and the valve seat 20, and the valve body 22 is strongly pressed against the valve seat 20 by the valve stem 7. They do not come into solid contact with each other due to the dynamic pressure of the fluid. Therefore, the flow rate of the liquid flowing through the openings 1d and 21 can be adjusted as desired, and generation of abrasion powder can be prevented, and as a result, contamination of the liquid to be handled can be prevented. Furthermore, since hard ceramic material is used for the main parts of the valve (valve seat 20, valve body 22, and sliding plate 4a), durability can be improved. Further, since the valve body 22 is formed into a disc body that is not connected to other parts, the structure can be relatively simple.

FIG. 4 shows another embodiment of the groove for generating dynamic pressure in the valve of the present invention, showing a herringbone-shaped groove 34. The herringbone-shaped groove 34 consists of an inner circumferential groove 36 and an outer circumferential groove 35, and when rotated in the direction of the arrow in this shape, the inner circumferential groove 34
The maximum dynamic pressure is generated along the circumference of the connection between the groove 6 and the outer circumferential groove 35. J3, the double-dashed chain line circle 39 in Fig. 4 is the valve seat 2.
Although the outer diameter of the circle corresponding to the opening 21 of 0 is shown, the size of this frontage 21 may be larger than the land 40 at the center.

FIG. 5 shows another embodiment of the valve body of the valve of the present invention. The valve body 41 includes a ten-sided plate 42 made of a hard ceramic material that faces the valve body 7 (not shown), and a tip facing a partition wall 44 made of a hard ceramic material and having a conical opening 48 shown by a two-dot chain line. It consists of a bottom plate 45 made of a hard ceramic material with a large diameter conical part, and a disk-shaped permanent magnet 43 embedded inside the ten-sided plate 42 and the bottom plate 45. The same magnetic poles as the permanent magnet 23 shown in FIG. 2(a) are magnetized.

Further, on the upper surface of the upper surface plate 42, that is, the surface 42a facing the valve stem 7 (not shown), a spiral groove 30 for generating dynamic pressure and a pressure equalizing portion 33 similar to those shown in FIG. 3(C) are formed.
A spiral groove (black portion) 46 for generating dynamic pressure is formed in a conical surface 45a of the lower plate 45 facing the partition wall 44. Further, the surface of the land 47 is formed to be a smooth surface as described above, and is formed so that the deviation from the ideal conical surface, that is, the waviness, is within the same range as in item 114. Further, the conical surface 48a of the opening 48 formed in the partition wall 44 is also formed to have the same slope and smoothness as the lower plate 45. In this embodiment, when the valve body 41 is rotated in the direction of arrow A by a rotating magnetic field along a plane substantially perpendicular to the axis 49,
The valve body 41 is moved to the partition wall 44 by a position adjustment mechanism (not shown).
When the valve body 41 and the partition wall 44 become close to each other, fluid dynamic pressure is generated between the valve body 41 and the partition wall 44 due to the action of the groove 46 for generating dynamic pressure, and the valve body 41 and the partition wall 44 become solid with each other. There will be no contact.

Furthermore, in this state, the groove 46 acts to push the fluid on the downstream side to the upstream side, so that the valve body 41 and the partition wall 4
4 and the flow rate can be cut off even if they are not in solid contact with each other.

That is, when trying to shut off the fluid, if there is a large amount of fluid backflow due to the 46, the total flow rate will be negative. Therefore, by adjusting the rotation speed of the valve body 41 or adjusting the force pressing the valve body 41 against the partition wall 44 depending on the differential pressure when the valve is shut off, the entire flow B can be maintained while maintaining dynamic equilibrium. can be blocked. Also, by moving the valve stem 7 away from the partition wall, the number of fluid flow ports increases, but the force pressing the valve body 41 against the valve stem 7 is weakened, so even if the rotational speed of the valve body 41 is relatively low. good.

Further, since the facing surfaces of the valve body 41 and the opening 48 are formed in a conical shape, the change filD in the mutual gap due to the movement ff1L of the valve stem 7 is as small as D=Lsin (conical angle). Therefore, the flow can be finely adjusted.

[Summary] As explained above, according to the present invention, when operating a valve, generation of wear powder due to solid contact is prevented, and
Durability can be improved and II4 construction can be simplified.

As a result, contamination of the fluid to be handled can be prevented, and the valve can be suitably used for valves that handle liquids such as ultrapure water and pharmaceuticals.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing one embodiment of the present invention, and FIG.
) is a side sectional view of the valve body, FIG. 2(b) is a sectional view taken along the line II in FIG. 1, FIG. 3(a) is a top view of the valve seat, and FIG.
) is a bottom view of the valve body, Figure 3 (C) is a top view of the valve body,
Figure (d) is a bottom view of the sliding plate, Figure 4 is a plan view showing another example of the dynamic pressure generating groove, and Figure 5 is a sectional view of the left half of the valve body showing another example. 6 is a side sectional view showing a conventional screw-in globe valve. 1... Valve box 1C... Partition wall 1d, 21...
・Opening 4... Presser foot 4a... Sliding plate 4
b...Stator 7...Valve rod 8...Handle wheel
20...Valve seat 22.41...Valve body 23.
43...Permanent magnet 30.46...Spiral groove
34... Herring ball-shaped grooves Figure 1, Figure 2 (CI) (b) Figure 4, Figure 5 (a) (c) (d)

Claims (1)

[Claims] A partition wall for partitioning a fluid passage, which is formed with an opening for the fluid to pass therethrough, and a member made of at least one material selected from a permanent magnet, a conductive material, or a hysteretic material are embedded, and the A valve body rotatable at any position facing the opening, and a position adjustment mechanism that supports the valve body and rotates the valve body using a rotating magnetic field generating means to adjust the gap between the valve body and the partition wall. and either one of the surfaces where the valve body and a partition wall or a member fixed to the partition wall face each other, and one of the faces where the valve body and a part of the position adjustment mechanism face each other. A valve characterized by having grooves for generating dynamic pressure formed on each of its surfaces.