WO2015072472A1

WO2015072472A1 - Valve with antistatic function and jig for mounting same

Info

Publication number: WO2015072472A1
Application number: PCT/JP2014/079923
Authority: WO
Inventors: 正澄船渡
Original assignee: 株式会社キッツ
Priority date: 2013-11-12
Filing date: 2014-11-12
Publication date: 2015-05-21
Also published as: JPWO2015072472A1; JP5996100B2

Abstract

Provided is a valve with an antistatic function, with which static electricity can be removed from the valve body and the stem, thereby reliably preventing the buildup of a charge, and with which a component used for conducting electricity can easily be attached from the outside due to a simple construction, and the presence of this component can be confirmed from the outside both before and after the valve is assembled. In addition, this component can be manufactured in a highly versatile manner while reducing the contact resistance and maintaining operability. Also provided is a tool for mounting this valve. A valve element (3) is provided in a body (2) so as to be capable of rotating via a stem (5) axially mounted on an axial mounting part (6). A conductive thin wavy plate member (20) of a prescribed length is mounted in an annular mounting groove (10) provided in the axial mounting part (6) and/or the stem (5), and this thin wavy plate member (20) makes contact with the outer circumferential surface (22) of the stem (5) and the inner circumferential surface (23) of the axial mounting part (6).

Description

Antistatic function valve and its mounting jig

The present invention relates to a valve with an antistatic function for preventing static electricity from being charged to a valve body and a stem, and a mounting jig for the valve.

For valves that use rubber or synthetic resin for valve seats such as ball valves, butterfly valves, plug valves, etc., or valve body side, the valve seat friction is caused by friction between the valve seats during opening and closing, and friction between the valve body and fluid. Static electricity may be generated on the body or stem. In this case, if the continuity from the valve body to the valve body is not secured, static electricity accumulates in the valve body, and discharge may occur between the valve body and the valve body, causing fluid to burn or explode and cause disasters, etc. There is. In order to prevent such a situation, a valve having an antistatic function in which static electricity is removed by connecting a valve body, a stem, and a valve body is known.

As this type of valve, for example, a valve with an antistatic device of Patent Document 1 has been proposed. In this valve, a hole is provided in the fitting portion of the stem into the groove, and a metal ball is fitted into this hole via a metal compression spring, and the metal ball is elastically pressed against the inner surface of the groove by the elastic force of the compression spring. This prevents static charges. A metal ball and a compression spring are prevented from slipping into the hole by caulking at the edge of the hole, and a valve in which charging is prevented by such a metal ball and a spring is generally used in many cases.
On the other hand, in Patent Document 2, a conductive ground spring is provided between the stem and the stem receiving cylinder to hold the packing, and the conductive leaf spring is bent into a concave groove formed on the inner peripheral surface of the conductive ground. A ball valve with an antistatic device in which is inserted and locked is disclosed.

Japanese Utility Model Publication No.59-11230 Japanese Utility Model Publication No. 63-39488

However, in the former anti-static valve such as Patent Document 1, it is difficult to perform caulking while storing the metal ball and the compression spring in the concave groove. It takes. Moreover, if the caulking process fails, the metal ball may not be able to contact the valve body or may not operate properly, so that it is necessary to replace the stem or remanufacture and perform the caulking process again. It is difficult to secure the space for mounting the metal ball and the compression spring on the stem, and it is necessary to provide the mounting space while maintaining the strength of the stem. Since the metal ball and the compression spring are provided in the liquid contact portion, it may be necessary to form the material with a special material in order to be able to operate in the liquid contact state.
Furthermore, it is difficult to determine whether the crimped state is good or not from the outside, and it is also difficult to confirm the mounting of the assembled metal ball or compression spring.

In the ball valve of the latter patent document 2, since the upper surface of the ground to which the leaf spring is attached is covered with a pressing plate for preventing the conductive leaf spring from falling off, it is difficult to confirm the attachment of the leaf spring. Become. When attaching a leaf spring, it is difficult to attach the leaf spring because the leaf spring, which has been bent in advance, must be attached to the groove on the inner periphery of the ground while bending the leaf spring by hand with the ground removed from the stem. It is also difficult to keep the contact point with the ground and stem constant. After the leaf spring is attached, it is necessary to attach the ground to the stem again. When the valve is used, both ends of the leaf spring and the bent portion facing each other at an angle of 180 ° are brought into contact with the inner periphery of the ground. Therefore, the contact may become unstable and static electricity may not be removed. At this time, the fact that the route for conducting static electricity is from the ground to the body from the bolt via the pressing plate is also an unstable factor of the deterioration of conductivity.
Since the leaf spring is arranged so as to hold the stem from the outside, the contact force of the leaf spring to the stem increases, and the stem load increases due to the spring load of the leaf spring, which adversely affects the operation. There was also.

The present invention has been developed to solve the above-mentioned problems, and its purpose is to remove static electricity to the valve body and stem to reliably prevent charging, and to provide a conductive structure with a simple structure. Can be easily mounted from the outside, and the presence or absence and mounting state of this part can be determined from the outside regardless of before and after the valve assembly, reducing contact resistance to ensure operability and manufacturing with high versatility Another object is to provide a valve with an antistatic function and a mounting jig for the same.

In order to achieve the above object, the invention according to claim 1 is provided so as to be rotatable through a stem in which a valve body provided in a body is mounted on a shaft mounting portion, and either the shaft mounting portion or the stem or A conductive thin plate corrugated member having a predetermined length is attached to the annular mounting grooves provided on both sides, and this thin plate corrugated member is brought into contact with the outer peripheral surface of the stem and the inner peripheral surface of the shaft mounting portion. It is a valve.

According to the second aspect of the present invention, an annular insertion port is formed in the upper gap between the shaft mounting portion and the stem, and the wave shape wave height of the thin plate corrugated member is reduced and the insertion port is inserted into the mounting groove. The thin corrugated member is restored by an elastic force at a position where the stem and the shaft mounting portion face each other so that the peaks and troughs of the thin corrugated member are in contact with both of them.

In the invention according to claim 3, the position of the mounting groove in the shaft mounting portion is above the shaft seal position of the stem, and a thin corrugated member is mounted in the mounting groove in a curved state, and both end portions of the thin corrugated member are With antistatic function that accumulates elastic force in the diameter expansion direction, elastically engages the inner peripheral surface of the mounting groove, and elastically contacts the stem by the pressure generated when the center side of the thin corrugated member is bent around the fulcrum It is a valve.

The invention according to claim 4 is a valve with an antistatic function in which a taper or an R surface is provided on the outer periphery of the stem, and a thin corrugated member can be inserted from the insertion port along the taper or the R surface.

The invention according to claim 5 is a valve with an antistatic function in which the width of the insertion port is made smaller than the width of the outer peripheral surface of the stem and the inner peripheral surface of the shaft mounting portion.

The invention according to claim 6 is a valve with an antistatic function in which the thin corrugated member has a length of about 25% to 50% of the circumference of the stem.

In the invention according to claim 7, a ground plate is provided in the shaft mounting portion, and a thin corrugated member is inserted into a mounting groove provided in the ground plate so that the thin corrugated member and the stem are in intermittent contact with each other. This is a valve with a prevention function.

The invention according to claim 8 is a mounting jig for a valve with an antistatic function, wherein an annular protrusion is formed at an end of the cylindrical body, and the annular protrusion is inserted into a mounting groove and a stem. And a thin plate corrugated member is bent in the curved state to be engaged with the mounting groove, and the outer periphery of the stem and the inner periphery of the mounting groove are provided in contact with each other.

According to the first aspect of the present invention, the conductive thin plate corrugated member is mounted in the annular mounting groove provided in one or both of the shaft mounting portion and the stem, and the thin plate corrugated member is connected to the stem and the shaft mounting portion. By making contact with the body, the static electricity to be charged to the valve body and stem through this thin corrugated member is conducted from the shaft side to the body side, and discharged from the body to the outside to reliably prevent static electricity from being charged. To do. In addition, since the thin corrugated members are in contact with each other while repelling in the outer circumferential direction, the valve can be operated while reducing the contact resistance to the stem and ensuring excellent operability with light operation torque. Conductive parts can be easily mounted from the outside with a simple structure without disassembling the valve or removing the parts, and the presence or absence of these parts can be visually recognized from the outside regardless of before and after the valve is assembled to prevent erroneous mounting. . A thin corrugated member can be provided according to various valve sizes, and since the mounting space for the thin corrugated member is small, it can be manufactured with high versatility.

According to the invention of claim 2, with the shaft mounting portion integrated into the body, the thin corrugated member is inserted from the insertion opening in the gap above the shaft mounting portion and the stem while accumulating the elastic force due to the wave shape. It can be mounted in a mounting groove provided after the insertion opening. For this reason, it is possible to easily attach the thin corrugated member with the valve assembled without attaching or detaching the shaft mounting part, and when the thin corrugated member reaches the mounting groove, the thin corrugated member is restored by elastic force while preventing it from coming out. It can be reliably arranged at a predetermined position. After installation, the presence or absence of the thin corrugated member can be visually confirmed from the insertion port above the mounting groove without removing the shaft mount, and during use, the corrugated thin corrugated member is attached to the stem and shaft at multiple locations. Continuous conduction is possible by contacting both of the parts.

According to the third aspect of the present invention, the mounting groove is located above the shaft seal position of the stem, so that liquid contact can be reliably prevented, and the thin corrugated member can be formed of various materials without depending on the type of fluid. . The both ends of the thin corrugated member in a curved state are elastically engaged with the inner peripheral surface of the mounting groove, and are elastically contacted with the stem by the pressure when the central side is bent around the fulcrum. The locked state is maintained, and it is possible to reliably prevent the slipping out.

According to the fourth aspect of the present invention, the thin corrugated member is inserted along the taper or the R surface so as to slide from the insertion opening of the mounting groove. It is possible to mount along the outer periphery of the mounting groove by reducing the diameter naturally so as to resist and guiding to the mounting groove and expanding the diameter when reaching the mounting groove. For this reason, easy mounting is possible without applying an excessive force in the direction of reducing the diameter of the thin corrugated member.

According to the invention according to claim 5, when the thin corrugated member is locked in the mounting groove between the stem outer peripheral surface and the shaft mounting portion inner peripheral surface in the restored state, the width of the insertion port is smaller than the mounting groove. The mounting state of the thin corrugated member in the mounting groove can be maintained to prevent the thin corrugated member from dropping from the insertion port.

According to the sixth aspect of the present invention, the thin corrugated member is provided shorter than the mounting groove, and the thin corrugated member can be locked to the mounting groove while giving an appropriate elastic force in the diameter increasing direction. Maintaining the contact state between the stem and the mounting groove to remove static electricity and suppressing the stem to the minimum necessary contact state against the stem prevents an increase in operating torque and facilitates valve opening and closing with a light operating force.

According to the invention of claim 7, since the thin corrugated member can be easily inserted into the ground plate provided separately from the body, and the mounting groove can be provided on the upper side of the body via the ground plate. A thin corrugated member can be mounted from the top of the body without disassembling the valve. Since the thin corrugated member and the stem contact each other intermittently, the contact area of the thin corrugated member is reduced to prevent the stem from being worn and the operating torque from increasing. Remove static electricity stably and reliably.

According to the eighth aspect of the present invention, the annular corrugated member presses and attaches the thin corrugated member by inserting the annular corrugated member into the mounting groove from the upper part of the body with the thin corrugated member temporarily attached to the body. The thin corrugated member can be easily mounted at an appropriate position in the mounting groove by inserting the groove.

It is sectional drawing which showed embodiment of the valve | bulb with an antistatic function of this invention. FIG. 2 is an AA enlarged sectional view of FIG. 1. It is the expansion perspective view which showed the insertion slot vicinity of a mounting groove. It is an expansion perspective view which shows the state which inserted the thin plate corrugated member of FIG. It is a front view which shows a thin plate corrugated member. It is the B section enlarged view of FIG. It is the perspective view which showed the other example of the thin plate corrugated member. It is a longitudinal cross-sectional view which shows the mounting state by a mounting jig. It is a principal part expanded sectional view which shows the other example of mounting | wearing of a thin plate corrugated member. It is sectional drawing which showed other embodiment of the valve with an antistatic function of this invention.

DESCRIPTION OF SYMBOLS 1 Valve main body 2 Body 3 Valve body 5 Stem 6 Shaft mounting part 9 Ground plate 10 Mounting groove 20 Thin plate corrugated member 22 Stem outer peripheral surface 23 Shaft mounting inner peripheral surface 24 End part 25 Center part 30 Taper (R surface)
31 Insertion Port 32 Tapered Surface 60 Jig Body 61 Cylindrical Body 62 Annular Projection L Length

Hereinafter, embodiments of a valve with an antistatic function and a mounting jig thereof according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the valve with an antistatic function of the present invention, and FIG. 2 shows an AA enlarged sectional view in FIG.

In FIG. 1, a valve with an antistatic function (hereinafter referred to as a valve body 1) in the present invention comprises, for example, a trunnion type ball valve. The valve body 1 has caps 2a on both sides of a body 2 by bolts and nuts 2b. It has a fixed three-piece structure. In the valve body 1, a valve body 3 is provided in the body 2, and the valve body 3 is rotatably provided via a stem 5 that is mounted on a shaft mounting portion 6 provided on the upper portion of the body 2. Yes.

The upper and lower sides of the valve body 3 are pivotally supported on a metal trunnion plate 13 such as stainless steel via a cylindrical radial bearing 11 and a disc-shaped thrust washer 12. The radial bearing 11 is made of non-conductive resin. In this embodiment, the outer periphery is made of PTFE (polytetrafluoroethylene) reinforced with stainless steel, and the thrust washer 12 is also made of non-conductive resin such as PTFE. It is made up of. The trunnion plate 13 is positioned and fixed to the body 2 by positioning pins 14.

A seat retainer 16 having a non-conductive resin, for example, a PTFE ball seat 15 mounted thereon, is disposed on both sides of the valve body 3, and the seat retainer 16 is biased toward the valve body 3 by a spring 17. Has been. For this reason, the static electricity charged in the valve body 3 cannot be released to the body 2 and the cap 2a via the ball seat 15 by the spring 17.

The body 2, the cap 2 a, the valve body 3, the stem 5, the bonnet 8 and the ground plate 9 described later are formed of a conductive metal, for example, stainless steel such as SUS316.
The bonnet 8 and the ground plate 9 are fixed by bolts 18, and the ground plate 9 is fixed to the body 2 by bolts (not shown). The stem 5 and the bonnet 8, and the stem 5 and the ground plate 9 are arranged in a non-contact state with a gap for rotating the stem 5 between the respective components.

The shaft mounting portion 6 has a bonnet 8 and a ground plate 9 provided on the upper side of the bonnet 8. A sealing O-ring 7 is mounted on the inner periphery of the bonnet 8, and a contact portion between the O-ring 7 and the stem outer peripheral side is a shaft seal position. Further, a radial bearing 26 made of a nonconductive material such as PTFE is mounted between the bonnet 8 and the stem 5. As shown in FIG. 8, between the bonnet 8 and the ground plate 9, for example, a gasket 19 made of a nonconductive material made of resin such as PTFE is partially attached. In the present embodiment, the ground plate 9 has a function of pressing the gasket 19 on the lower surface and a function of mounting an actuator (not shown) for opening and closing the valve on the upper surface. A radial bearing 27 made of a nonconductive material such as PTFE is mounted between the ground plate 9 and the stem 5.

Between the shaft mounting portion 6 and the stem 5, an annular mounting groove 10 is provided on the ground plate 9 on the shaft mounting portion 6 side. As shown in FIG. 2, the mounting groove 10 has conductivity. A thin corrugated member 20 having a predetermined length is mounted. The mounting groove 10 is provided above the shaft seal position of the stem 5, whereby the thin corrugated member 20 is disposed outside the wetted part through which the fluid flows.

As shown in FIGS. 2 to 4, the thin corrugated member 20 is mounted in a mounting groove 10 formed on the shaft mounting portion 6 side in a curved state concentric with the stem 5, so that the outer peripheral surface 22 of the stem 5 and the shaft Corrugated peaks and valleys are provided on the inner peripheral surface 23 of the mounting portion 6 in an intermittent manner. Both

end portions

24, 24 of the thin corrugated member 20 are elastically engaged with the mounting groove 10 of the inner peripheral surface 23 of the shaft mounting portion in a state in which the elastic force in the diameter increasing direction is accumulated, and the thin corrugated member 20 has a length. The center portion 25 that is the center side of the direction is elastically contacted by the pressure generated when the center portion 25 is bent to a fulcrum.

5 and 6, the thin corrugated member 20 is made of metal, and is made of a metal material such as spring steel such as SUS304-CSP or copper alloy. 5 and 6 show the shape of the thin corrugated member 20 in a natural state where no external force is applied.
The length L of the thin corrugated member 20 is preferably about 25% to 50% of the circumference of the stem 5. When the length L is less than 25% of the circumference of the stem 5, the thin corrugated member 20 is too short to bend, and the thin corrugated member 20 may be detached from the mounting groove 10. If the stem 5 is slightly tilted during rotation, the stem 5 may not come into contact with the thin corrugated member 20. On the other hand, if the length L exceeds 50% of the circumference of the stem 5, it may be too long, and it may take time to mount the thin corrugated member 20 in the mounting groove 10.

The plate thickness t of the thin plate corrugated member 20 is in the range of 0.06 mm <plate thickness t <0.2 mm, and preferably about 0.1 mm. If the plate thickness t is 0.06 mm or less, the elastic force becomes weak and the contact necessary for electrical conduction may not be obtained. On the other hand, if the plate thickness t is 0.2 mm or more, it is too thick and hard, and in particular, since it has a corrugated shape, the strength is too strong and it may be difficult to curve.

As the overall shape of the thin corrugated member 20, the number of waves, the wave height H, and the wave width W need to be considered in particular. When the width W of one wave is from mountain to mountain, or from valley to valley, and this one cycle is one wave, the number of waves in one cycle is increased, so that the stem outer peripheral surface 22 and the shaft mounting portion Since each contact point with the surrounding surface 23 increases, these become easy to conduct | electrically_connect. However, if the number of waves is increased too much, when the thin corrugated member 20 is bent and inserted into the mounting groove 10, this wave is easily caught on the bonnet 8 and becomes difficult to handle. The number of waves is good.

Since the spring load is easily stabilized by increasing the wave height H, the contact state with the stem outer peripheral surface 22 and the shaft mounting portion inner peripheral surface 23 is stabilized. However, if the wave height H is excessively increased, the contact resistance between the stem outer peripheral surface 22 and the shaft mounting portion inner peripheral surface 23 becomes excessive, and the operating torque becomes excessive. It is desirable.
By widening the wave width W, when the thin corrugated member 20 is inserted into the mounting groove 10, it can be easily elastically deformed in a curved shape, and plastic deformation at the time of mounting can be prevented to ensure a uniform spring load.

In consideration of these matters, when the thin corrugated member 20 is manufactured, the minimum number of waves is two and the maximum is about six, and the wave height H is set to the mounting groove 10. For example, it is desirable that the width W of the wave be set to a size that does not cause plastic deformation when the thin corrugated member 20 is inserted.

As the dimensions of the thin corrugated member 20 in the present embodiment, for example, when the stem diameter φD in FIG. 1 is 60 mm, the number of waves of the thin corrugated member 20 in FIG. 5 and FIG. It is preferable to set 1.7 mm, wave width W: 15 mm, length L to 90 mm, plate thickness t to 0.1 mm, and plate width X shown in FIGS. 3 and 4 to 4 mm. In this case, the curved surface R of one wave has a radius of about 8 to 9 mm. By having this curved surface R, the contact resistance to the stem 5 can be reduced and the valve body 1 can be operated with a light operating torque while increasing the number of contact points with the stem 5 and the mounting groove 10.

As shown in FIG. 4, a taper 30 is provided on the outer periphery of the stem 5 near the upper surface of the ground plate 9, and an annular insertion port 31 is formed in the gap above the shaft mounting portion 6 and the stem 5. The mounting groove 10 is positioned below the insertion port 31 on the lower side. The insertion port 31 is provided with a tapered surface 32 at a position facing the taper 30, and the thin corrugated member 20 is provided between the taper 30 and the tapered surface 32 so as to be inserted into the mounting groove 10 through the insertion port 31. It is done. As a result, the opening side of the insertion port 31 is widened to facilitate insertion of the thin corrugated member 20, and the inserted thin corrugated member 20 is guided to the mounting groove 10 by the taper 30 and the tapered surface 32. The taper 30 may be an R surface, and the thin corrugated member 20 can be inserted from the insertion port 31 of the mounting groove 10 along the taper 30 or the R surface. In the present embodiment, the insertion port 31 is provided with the tapered surface 32. However, the tapered surface 32 is not essential, and may be a straight insertion port 31 without the tapered surface 32. Instead of the tapered surface 32, a rounded surface (not shown) may be provided.

When the thin plate corrugated member 20 is attached to the valve body 1 described above, the thin corrugated member 20 is curved as shown in FIGS. 2 and 3, and the solid line shown in FIG. It inserts from the insertion port 31 in the direction of the downward arrow. Accordingly, the thin corrugated member 20 slides along the taper 30 and the taper surface 32 in a curved state and expands when reaching the mounting groove 10.

The width W1 of the insertion port 31 is larger than the plate thickness t of the thin corrugated member 20 shown in FIG. 6 and smaller than the wave height H.
Therefore, the thin corrugated member 20 is in a state where the height of the corrugated wave is reduced, specifically, in a state where the elastic force of each corrugated portion is accumulated while being crushed in the radial direction, from the insertion port 31. It is inserted into the mounting groove 10.

When the inserted thin plate corrugated member 20 reaches the mounting groove 10, it is restored by the elastic force at the opposed position of the stem 5 and the shaft mounting portion 6 in the mounting groove 10, and a peak of the corrugated portion of the thin corrugated member 20 is obtained. The valleys are respectively brought into contact with both the outer peripheral surface 22 of the stem 5 and the inner peripheral surface 23 of the shaft mounting portion 6.

The width W2 between the stem 5 and the ground plate 9 (mounting groove 10) at the position where the mounting groove 10 is formed is larger than the width W1, in other words, the width W1 of the insertion port 31 is equal to that of the stem outer peripheral surface 22. It is smaller than the width W2 which is the width with the inner peripheral surface 23, and is smaller than the wave height H of the thin corrugated member 20 of FIG.
Accordingly, the thin corrugated member 20 is locked and fixed to the mounting groove 10 in a state where the elastic force of the corrugated portion is accumulated.

At this time, the thin corrugated member 20 is not fixed, and can freely move in the circumferential direction in the mounting groove 10. In this state, the thin corrugated member 20 is mounted in a curved shape. Then, outward forces F1 and F1 are generated on the

end portions

24 and 24 to return to the linear state, and an inward force F2 is also generated on the central portion 25 to return to the linear state. Therefore, the thin corrugated member 20 tries to return to the initial state with the

end portions

24 and 24 as fulcrums, the

end portions

24 and 24 are pressed against the mounting groove 10 by the force F1, and the central portion 25 is moved by the force F2. Press contact with the stem outer peripheral surface 22. For this reason, the stem 5 and the ground plate 9 are electrically connected via the thin corrugated member 20.
Since the thin corrugated member 20 is locked in a state of being elastically projected between the mounting groove 10 of the shaft mounting portion inner peripheral surface 23 and the stem outer peripheral surface 22, the thin plate corrugated member 20 is reliably prevented from falling off the mounting groove 10.

Furthermore, the thin plate corrugated member 20 is formed with an outer peripheral protrusion 40 and an inner peripheral protrusion 41 due to the corrugation, which form corrugated peaks and troughs. In the mounting state of the thin corrugated member 20 in the mounting groove 10, the outer peripheral protrusion 40 and the inner peripheral protrusion 41 are slightly compressed between the shaft mounting inner peripheral surface 23 and the stem outer peripheral circle 22. Thus, the elastic force of the thin corrugated member 20 to the stem 5 and the ground plate 9 is increased, and the conduction state thereof can be increased.

The outer peripheral protrusion 40 and the inner peripheral protrusion 41 are determined when the thin corrugated member 20 is mounted in the mounting groove 10 and are not determined in advance. Since the thin corrugated member 20 has no front and back sides, the thin corrugated member 20 can be mounted in any direction without being particular about the mounting direction.

In the valve with antistatic function of the above embodiment, when the mounting groove 10 is provided on the inner peripheral surface side of the shaft mounting portion 6, the mounting groove 10 is provided above the shaft seal position in addition to the ground plate 9. If there is, it may be provided in the bonnet 8. Further, the mounting groove 10 may be constituted by two parts, that is, a ground plate 9 and an actuator mounting part (not shown), or may be constituted by locking a retaining ring (not shown) on the inner periphery of the ground plate 9.

On the other hand, the mounting groove 10 may be provided on the outer peripheral surface 22 of the stem 5, and the thin corrugated member 20 may be mounted in the mounting groove 10. As described above, the annular mounting groove 10 is provided in one or both of the shaft mounting portion 6 and the stem 5, and the thin corrugated member 20 mounted in the mounting groove 10 is connected to the stem outer peripheral surface 22 and the shaft mounting portion inner peripheral surface 23. Can be prevented from being charged.

Furthermore, the mounting groove 10 may be provided in various shapes other than the annular shape, as long as the thin corrugated member 20 can be mounted while preventing dropping off and charging can be prevented. For example, by providing the outer peripheral side protrusion 40 and the inner peripheral side protrusion 41 in a shape that can be pressed evenly, it is possible to reduce torque and stabilize torque during the rotation of the stem.

Further, the thin corrugated member 20 has a length of at least 25% of the circumference of the stem 5, and both end

portions

24, 24 can abut the shaft mounting portion inner peripheral surface 23 and the center portion 25 can contact the stem outer peripheral surface 22. If so, it may be mounted on either the primary side or the secondary side of the stem 5 with respect to the flow path direction.

Furthermore, the

end portions

24 and 24 of the thin corrugated member 20 do not have to be locked to the inner peripheral surface of the mounting groove 10, and in this case, the outer peripheral projection 40 near the end 24 serves as a fulcrum. The central portion 25 is pressed against the stem outer peripheral surface 22 by the force F2.

Then, the effect | action in the said embodiment of the valve with an antistatic function of this invention is demonstrated.
In the valve with antistatic function of the present invention, when the thin corrugated member 20 is mounted, the thin corrugated member 20 with the wave height reduced is inserted from above the stem 5 of the body 2 to which the shaft mounting portion 6 is attached. The thin corrugated member 20 can be guided and mounted so as to slide from the insertion port 31 through the taper 30 and the tapered surface 32 to the mounting groove 10. As described above, since the insertion slot 31 can be surely disposed at a predetermined position of the mounting groove 10, the mounting operation is facilitated.

After the thin corrugated member 20 is mounted, the width W2 is larger than the width W1 and smaller than the wave height H as described above, so that the thin corrugated member 20 is elastically increased to the width W2. While being restored, it can be locked to the mounting groove 10 to maintain the mounting state in the mounting groove 10, and can be prevented from falling off the insertion port 31.

Since the mounting groove 10 is formed on the lower side following the insertion port 31, the mounting groove 10 can be seen from the upper part of the stem 5 through the insertion port 31, and the thin corrugated member 20 is mounted on the mounting part 10. It is possible to easily check the presence or absence and state of wearing. In this case, as described above, an actuator may be mounted on the upper portion of the ground plate 9, but since this actuator is mounted after the shipping inspection, the mounting state of the thin corrugated member 20 can be confirmed before mounting the actuator. .

By mounting the conductive thin plate corrugated member 20 in the mounting groove 10 formed in the ground plate 9 of the shaft mounting portion 6, the outer peripheral projection 40 comes into pressure contact with the mounting groove 10 of the ground plate 9, and the inner peripheral side The protrusion 41 is in pressure contact with the stem 5. Thereby, the thin plate corrugated member 20 contacts both the stem outer peripheral surface 22 and the shaft mounting portion inner peripheral surface side 23, and the bonnet 8 and the body integrated with the ground plate 9 from the stem 5 through the thin plate corrugated member 20. 2 is used as a ground part to ensure electrical conductivity from the valve body 3 to the body 2, and static electricity charged on the valve body 3 and the stem 5 can be reliably removed via the thin plate corrugated member 20.

In this case, when static electricity is generated in the valve body 3 by operating the stem 5 or the like, the static electricity charged in the valve body 3 is conducted to the stem 5 that is in direct contact with the metals. This static electricity is conducted to the ground plate 9 through the thin corrugated member 20, and then to the bonnet 8 that is in direct contact with the ground plate 9, and further to the body 2 that is in direct contact with the bonnet 8. Thus, charging of the valve body 3 is prevented. The static electricity conducted to the body 2 is conducted to a cap 2a that is in direct contact with the body 2 and a pipe (both not shown) connected to the cap 2a via a metal bolt, and discharged to the outside. .

The thin corrugated member 20 is restored by an elastic force at a position where the stem 5 and the shaft mounting portion 6 are opposed to each other in the mounting groove 10 so that the valve body 3 is rotated by the stem 5. In this case, the contact state of both the thin corrugated member 20 to the stem 5 and the shaft mounting portion 6 can be ensured by the elastic force, and the antistatic performance can be maintained for a long time.

FIG. 7 shows another example of the thin corrugated member. The thin plate corrugated member 50 is provided with a linear material formed in a corrugated shape, and can be press-contacted to the shaft mounting portion inner peripheral surface 23 and the stem outer peripheral surface 22 in FIG. 2 as in the case of the thin plate corrugated member 20 described above. The outer peripheral side protrusion 40 and the inner peripheral side protrusion 41 are provided. Even when the thin plate corrugated member 50 is mounted in the mounting groove 10 of FIGS. 2 to 4, the same function as the thin plate corrugated member 20 is exhibited. In this case, the cross-section of the thin corrugated member 50 may be distorted, which may cause distortion. However, if the thin corrugated member 50 is inserted at the same time as the valve body 1 is assembled, it can be easily mounted in the mounting groove 10. become. At this time, the thin corrugated member 50 is mounted on the mounting groove 10 so as to be inclined at an angle, so that the falling is reliably prevented. Further, the cross-sectional shape of the thin corrugated member may be other than such a circular shape or the rectangular shape, and can be provided in various shapes.

FIG. 8 shows a case where, for example, the thin corrugated member 20 is mounted using a mounting jig for the valve with an antistatic function (hereinafter referred to as a jig body 60). The jig body 60 is used to easily attach the thin corrugated member 20 to the ground plate 9.
The jig body 60 is integrally formed of metal, for example, and has a cylindrical body 61 and an annular annular protrusion 62. A through hole 63 is formed in the center of the cylindrical body 61, and an annular protrusion 62 is provided on the end side of the cylindrical body 61. The thickness S of the annular protrusion 62 can be inserted between the taper 30 and the tapered surface 32 constituting the insertion port 31, specifically, between the maximum outer periphery of the stem 5 and the minimum inner periphery of the ground plate 9. Dimension is provided. The height T of the annular protrusion 62 is set such that the thin corrugated member 20 can be inserted into the mounting groove 10 and the thin corrugated member 20 is not pushed down too much. Specifically, the height T is provided with substantially the same dimension as the length from the upper surface of the ground plate 9 (the upper surface in the vicinity of the mounting groove 10) to the upper end of the mounting groove 10. The through hole 63 is provided with an inner diameter that matches the shaft diameter of the stem 5 so that the stem 5 can be inserted.

4 and 8, when the thin corrugated member 20 is mounted, first, the thin corrugated member 20 is lightly inserted between the taper 30 and the tapered surface 32. Subsequently, the jig body 60 is mounted from above so that the annular protrusion 62 is inserted between the mounting groove 10 into which the thin corrugated member 20 is inserted and the stem 5 while inserting the stem 5 into the through hole 63. To do. Thereby, the annular protrusion 62 presses the thin corrugated member 20 in the mounting direction, and the thin corrugated member 20 can be guided and locked to the mounting groove 10 in a curved state.

In this case, the thin corrugated member 20 is inserted while being crushed in the radial direction by the taper 30 and the tapered surface 32, and is expanded in the radial direction by elastic force when pushed into the mounting groove 10. Fixed. At this time, since the thin corrugated member 20 reaches the mounting groove 10 and spreads instantaneously and emits a contact sound, the jig corrugated member 60 is inserted until the thin contact corrugated member 20 is confirmed. Can be mounted in the groove 10. If the jig main body 60 is used in this manner, the mounting of the thin corrugated member 20 becomes easier. However, the jig main body 60 is not necessarily mounted, and may be mounted directly with fingers or the like. .

FIG. 9 shows another mounting example of the thin corrugated member 20. For example, the thin corrugated member 20 is mounted on the bonnet 8 in the shaft mounting portion 6. In this case, an annular mounting groove 70 is provided above the liquid contact portion of the bonnet 8, specifically, above the O-ring 7 that is the shaft seal position, and the thin corrugated member 20 is mounted in the mounting groove 70. . At the time of assembling, the thin corrugated member 20 is mounted along the mounting groove 70, and then the bonnet 8 is mounted on the body 2 from the upper part of the stem 5. In this case, the length of the thin corrugated member 20 is preferably about 50% of the circumference of the stem 5 in order to prevent dropping after assembly. .

When the thin corrugated member 20 is attached to the bonnet 8, the presence or absence of the thin corrugated member 20 and the state of attachment may be confirmed by visual observation from above before attaching the ground plate 9. After mounting the ground plate 9, the thin corrugated member 20 can be confirmed by using an appropriate tester or the like. Although it is possible to mount the thin corrugated member 20 on the liquid contact side of the bonnet 8, it is desirable to mount it on the outside of the liquid contact portion in order to reliably exhibit the antistatic function.

Furthermore, the thin corrugated member 20 may be provided in a shaft mounting portion other than the bonnet 8 and the ground plate 9. A thin corrugated member can also be mounted in the groove. In any case, the antistatic function is exhibited in the same manner as described above. However, it is difficult to process the mounting groove on the body 2, and the processing of the mounting groove on the stem 5 increases the strength by increasing the stem diameter φD. And the stem is a high-strength material, which makes it difficult to work. In consideration of these, it is desirable that the thin corrugated member 20 is mounted in the mounting groove 10 provided in the ground plate 9. The ground plate 9 may be provided integrally with the bonnet 8.

FIG. 10 shows another embodiment of the valve with an antistatic function of the present invention. In this embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The valve body 80 in this embodiment is a floating ball valve, and has a two-piece structure in which a cap 82 is fixed to a body 81 with bolts and nuts 2b. A valve body 83 is provided in the body 2, and the valve body 83 is rotatably provided via a stem 85 that is mounted on a shaft mounting portion 84 provided on the body 81.

For example, PTFE ball seats 86 are disposed on both sides of the valve body 83, respectively. For this reason, static electricity charged on the valve body 83 cannot be released from the ball seat 86 to the body 81 and the cap 82.

The body 81, the cap 82, the valve body 83, the stem 85, and the packing holding ring 87 are made of conductive metal, for example, stainless steel such as SUS316.
The packing retainer ring 87 is provided so that the lower part can be inserted into the shaft mounting part 84 in order to press the seal packing 88 mounted in the shaft mounting part 84 from above. By tightening, the contact position between the packing 88 and the outer peripheral side of the stem 85 becomes the shaft seal position. The stem 85 and the body 81 (including the shaft mounting portion 84), the stem 85 and the packing presser wheel 87 are provided in a non-contact state with a gap for rotating the stem 85 between the respective parts. ing. In the drawing, 90 is a PTFE stem bearing having a substantially L-shaped cross section, which is mounted between the flange portion 91 of the stem 85 and the body 81. Further, a spring member (not shown) may be attached between the valve body 83 and the stem 85 in the radial direction of the stem 85 to ensure conductivity.

An annular mounting groove 89 is provided on the upper part of the packing holding wheel 87, and the thin corrugated member 20 is mounted in the mounting groove 89. Thus, the mounting groove 89 is provided above the shaft seal position (packing 88) of the stem 85, so that the thin corrugated member 20 contacts the outer peripheral surface 85a of the stem 85 and the inner peripheral surface of the mounting groove 89. In this state, it is arranged outside the wetted part where the fluid flows.

When static electricity is generated in the valve body 83, the static electricity charged in the valve body 83 is conducted to the stem 85 that is in direct contact with the metal. Static electricity is conducted to the packing retainer ring 87 through the thin corrugated member 20, and then directly contacts the packing retainer ring 87 or indirectly through bolts (not shown) that fasten and fix the packing retainer ring 87 to the body 81. The valve body 83 is prevented from being charged by being electrically connected to the shaft mounting portion 84 (body 81) in contact with the valve body. The static electricity conducted to the body 81 is directly connected to the body 81 or indirectly connected via the bolt 2b to the cap 82 and piping connected to the cap 82 via a metal bolt (both not shown). Conducted.
In this manner, as in the case of the trunnion type ball valve of the above-described embodiment, electrostatic charging can be prevented through the thin corrugated member 20. When the thin corrugated member 20 is attached, the thin corrugated member 20 can be easily attached between the stem 85 and the packing retainer ring 87 from above the valve, and the presence / absence of the attachment and the attachment state can be confirmed by visual observation from the outside.

In the case of this floating ball valve, the thin corrugated member 20 is provided in the wetted part, and the thin corrugated member 20 can be formed of a special material to cope with a predetermined fluid.
Further, the thin corrugated member can be attached to a valve other than the ball valve, and in this case as well, the same function as described above can be achieved by providing the thin corrugated member between the stem and the shaft mounting portion. Can demonstrate.

Claims

A valve body provided in the body is rotatably provided via a stem mounted on the shaft mounting portion, and a predetermined length is provided in an annular mounting groove provided on either or both of the shaft mounting portion and the stem. A valve with an antistatic function, comprising a conductive thin plate corrugated member having a contact between the outer peripheral surface of the stem and the inner peripheral surface of the shaft mounting portion.
An annular insertion port is formed in an upper gap between the shaft mounting portion and the stem, and the height of the corrugated wave of the thin plate corrugated member is inserted into the mounting groove from the insertion port, 2. The antistatic function according to claim 1, wherein the thin corrugated member is restored by an elastic force at a position where the stem and the shaft mounting portion face each other so that the peaks and troughs of the thin corrugated member are in contact with both. With valve.
The position of the mounting groove in the shaft mounting portion is above the shaft seal position of the stem, the thin corrugated member is mounted in the mounting groove in a curved state, and both end portions of the thin corrugated member are extended in the diameter increasing direction. The elastic force is accumulated and elastically engaged with the inner peripheral surface of the mounting groove, and the stem is elastically brought into contact with the stem by the pressure generated when the central side of the thin corrugated member is bent around a fulcrum. Valve with antistatic function as described in 1.
The antistatic according to any one of claims 1 to 3, wherein a taper or an R surface is provided on an outer periphery of the stem, and the thin corrugated member is provided along the taper or the R surface so as to be inserted from the insertion port. Valve with function.
The valve with an antistatic function according to any one of claims 2 to 4, wherein a width of the insertion port is made smaller than a width between an outer peripheral surface of the stem and an inner peripheral surface of the shaft mounting portion.
The valve with an antistatic function according to any one of claims 1 to 5, wherein the thin corrugated member has a length of about 25% to 50% of a circumference of the stem.
7. A ground plate is provided in the shaft mounting portion, and the thin corrugated member is inserted into the mounting groove provided in the ground plate so that the thin corrugated member and the stem are in intermittent contact. The valve with an antistatic function according to any one of the above.
8. A mounting jig for a valve with an antistatic function according to claim 1, wherein an annular protrusion is formed at an end of the cylindrical body, and the thin corrugated member is inserted into the annular protrusion. A mounting jig that is inserted between the mounting groove and the stem so as to contact the outer periphery of the stem and the inner periphery of the mounting groove by locking the thin corrugated member to the mounting groove in a curved state.