CN211951655U

CN211951655U - Valve with a valve body

Info

Publication number: CN211951655U
Application number: CN201921704782.1U
Authority: CN
Inventors: J·寇因克; M·罗恩斯
Original assignee: Hercules Corp
Current assignee: Hercules Corp; Samson AG
Priority date: 2018-10-12
Filing date: 2019-10-12
Publication date: 2020-11-17
Anticipated expiration: 2029-10-12
Also published as: DE202018105866U1

Abstract

The present application relates to a valve. The valve comprises a valve housing and a lifting rod (4,32) and a contact piece (2,38,50) which is connected to the valve housing in an electrically conductive manner, wherein the lifting rod (4) is guided through the contact piece (2,38,50), wherein the lifting rod (4) can be moved relative to the contact piece, wherein an electrically conductive rotatable part (18,44,54) bears against a rolling region of the lifting rod (4) or against a rolling region of a component (34) which is fixedly connected to the lifting rod (4), wherein the electrically conductive rotatable part (18,44,54) is pressed against the rolling region with a pressing force, wherein the pressing force is selected such that the resulting static friction force is greater than the braking force generated by the rotatable part (18,44, 54).

Description

Valve with a valve body

Technical Field

The utility model relates to a governing valve, this governing valve include valve case and lifter and with valve case conductive connection's contact member (Kontaktierung element). The lifting rod extends through the contact piece, and the lifting rod can move axially relative to the contact piece.

Background

Static charging in or on the valve may lead to spark formation and thus to dangerous conditions. This means that in the regulating valve it must be ensured that the valve cone is reliably grounded in the line in every position. There is no direct contact with the valve housing via the metal valve seat when the valve cartridge is open. The contact is only made indirectly via the drive mechanism and/or the packing sleeve.

EP0096366a2 relates to an electrostatic lead-away device for a tap, the spherical surface of which has one contact piece arranged between the ball valve and the shaft and a second contact piece between the shaft and the stuffing box or nut. The contact element between the ball and the shaft is formed by two metal pins extending in a bushing, which are in contact with the ball and the shaft by means of a spring arranged between the two metal pins, so that the spring is not exposed to aggressive liquids. This arrangement for conducting away electrostatic energy is not suitable for the above-mentioned regulating valves, is complicated in construction and suffers from a certain amount of wear.

SUMMERY OF THE UTILITY MODEL

According to the invention, the electrically conductive rotatable part is pressed onto the lifting rod in such a way that the pressing force is selected such that the resulting static friction is greater than the braking torque caused by the rotatable part and its bearing.

This has the advantage that the friction on the conductive part on the lifting rod is low, but the large stroke of the lifting rod accompanying the contact-making can still be covered.

The valve comprises a valve housing and a lifting rod and a contact piece connected to the valve housing in an electrically conductive manner, through which the lifting rod is guided, the lifting rod being movable relative to the contact piece, wherein an electrically conductive rotatable part bears against a rolling area of the lifting rod or against a rolling area of a linear guide mechanism connected to the lifting rod, wherein the electrically conductive rotatable part is pressed against the rolling area with a pressing force, wherein the pressing force is selected such that the resulting static friction is greater than the braking force generated by the rotatable part.

According to a first preferred embodiment, the rotatable part is designed as a conductive annular spring which surrounds the lifting rod under pretension. The annular spring is biased by the pretensioning thereof in the circumferential direction to generate a pressing force, and is supported in the first lifting direction by an electrically conductive shoulder arranged in the contact-making part, wherein the pretensioning of the annular spring is adjusted in such a way that the annular spring rolls around its circumference when it bears against the shoulder and the lifting rod is moved in the first lifting direction. The axis of rotation about which the annular spring rotates corresponds to the spring coil axis for this purpose.

According to the invention, the magnitude of the contact force is selected such that the force transmitted to the annular spring by the movement of the lifting rod is so great that the rolling friction force is greater than the braking force which occurs as a result of the spring maximum restoring moment which counteracts the rolling of the spring and the sliding friction force which corresponds to the sum of the friction forces at the bearing of the annular spring in the contact-making part.

In particular, in a second lifting direction opposite to the first lifting direction, the annular spring is supported by a carrier mounted axially movably relative to the contact-making member and axially movably relative to the lift rod. The first lifting direction is then in the direction of gravity, where the weight of the carrier is dimensioned such that it ensures that the annular spring bears against the shoulder during the movement of the lifting rod in the second lifting direction.

The annular spring is preferably a helical coil spring with a small spring constant.

The weight of the carrier ring and the annular spring are matched to one another in such a way that, when the lifting rod is moved in the second lifting direction, a torsion of the annular spring about its circumferential axis is achieved, but the annular spring remains against the shoulder. The gravity of the bearing ring is smaller than the pressing force of the annular spring on the lifting rod.

In particular, the weight of the carrier is preferably greater than the static friction between the annular spring and the rod, so that the annular spring is continuously pressed against the shoulder.

According to a further preferred embodiment, the carrier is also designed in the form of a ring, wherein the ring is penetrated by the lifting rod.

In addition, the contact member may include a contact housing and a separable closure member that restricts movement of the carrier in the second lifting direction.

The carrier can thus be inserted into the contact housing, wherein in this way a stop is provided if the friction properties of the annular spring weaken during operation and the carrier ring is moved by the annular spring as the lifting rod moves.

The closure member may also preferably include a lifter guide mechanism. It provides for precise movement of the lifting rod relative to the contact piece, for which smaller tolerances can be achieved.

The closure member may comprise a flange or a clamping ring, thereby ensuring a simple detachable fixation to the contact-making member.

The contact piece can also have a shoulder, i.e. a support shoulder, radially outside the spring in the first lifting direction, which is slightly smaller than the cross-sectional diameter of the annular spring.

This results in the carrier abutting against the bearing shoulder when the annular spring is compressed such that its cross section is smaller in the lifting direction than the height of the bearing shoulder and the annular spring is not compressed any further. Thereby, the friction of the support of the annular spring can be reduced.

The contact-making means has a stop for the carrier in the first lifting direction, against which the carrier bears after a predetermined compression of the annular spring in the first lifting direction.

The contact piece can be inserted into the valve housing or can be produced integrally with the valve housing.

According to a further advantageous embodiment of the invention, the electrically conductive rotatable part can comprise a spherical roller, which is biased by a spring, wherein the contact force acting on the rolling area is provided by the spring force of the spring. The braking force is formed by the friction of the ball in the socket of the spherical roller.

The spherical roller has low friction and ensures a long-lasting electrical contact between the ball and the housing of the spherical roller during corresponding production.

The pressing force acting on the rolling area and the force of the spring acting on the spherical roller are preferably directed in the same direction.

It can also be provided that a surface inclined relative to the lifting rod opens into the contact-making part, in which inclined surface at least one ball biased against the lifting direction is guided, in particular by a spring.

Other advantages, features and applications of the present invention may be derived from the following description taken in conjunction with the embodiments as shown in the figures.

Drawings

The terms and corresponding reference numerals used in the following list of reference numerals are used in the specification, claims and drawings to illustrate:

fig. 1 shows a detail of a first contact piece, in which a guide mechanism for a lifting rod in a control valve according to the invention is arranged;

fig. 2 shows a detail of a second contact piece, in which a guide mechanism for the lifting rod in the control valve according to the invention is arranged;

fig. 3a shows a detail of another contact-making element according to the invention;

fig. 3b shows a detail of the spherical roller of the contact-making member according to fig. 3a, and

fig. 4 shows a detail of a further embodiment of the contact-making part.

List of reference numerals

2 contact connecting piece

4 lifting rod

6 groove

8 guide ring

10 load ring

12 locking ring

14 stop surface

15 convex shoulder

16 stop surface

18 ring spring

20 stop surface

24 stop surface

26 stop surface

28 step part

30 yoke

32 lifting rod

34 linear guide mechanism

36 scroll zone

38 contact member

40 spherical roller

42 spring

44 ball

50 contact connecting piece

52 slide rail

54 ball

56 spring

58 locking ring

Detailed Description

Fig. 1 shows a contact part 2 in a first detail, on which a lifting rod 4 is mounted and in which a groove 6 is provided, in which a guide ring 8 for guiding the lifting rod 4 and a carrier ring 10 that can be moved axially in the groove 6 are seated. The guide ring 8 and the carrier ring 10 are locked in the recess 6 by a locking ring 12 inserted into the contact part 2.

A shoulder 15 is provided in the contact part 2, on which an electrically conductive annular spring 18 rests, which comes into contact with the lower radial stop face 14 of the carrier ring 10.

An annular spring 18 surrounds the lifting rod 4 and bears against the shoulder 15 and projects beyond the stop face 16 by an excess distance. The support ring 10 is pressed by its weight via the lower stop surface 14 against the annular spring 18.

According to the utility model discloses, so select the pretightning force of annular spring 18, promptly, annular spring 18 can roll on lifter 4 when 4 elevating movement of lifter. For this purpose, the annular spring 18 is supported axially on the contact part 2 and radially on the lifting rod 4. For this purpose, the electrically conductive connection between the lifting rod 4 and the valve housing 2 is established by means of an annular spring 18, which is formed by the annular spring 18 being supported in an electrically conductive manner on both sides in the axial direction on the carrier ring 10 and the contact piece 2.

By means of the carrier ring 10 bearing axially with the stop face 14 on the annular spring 18, the annular spring 18 is pressed against the shoulder 15 by the force exerted by the weight of the carrier ring 10. The movement of the carrier ring 10 is finally limited by the stop between the carrier ring 10 and the contact piece 2.

In order to advantageously adjust the load of the annular spring 18 by means of the carrier ring 10, the weight of the carrier ring 10 and thus the amount of force applied by the carrier ring 10 to the annular spring 18 is arranged such that said force is smaller than the radially acting pressing force of the annular spring 18.

In order to limit the forces acting axially on the annular spring 18, in particular in the case of dynamic vibrations, the axial displaceability of the carrier ring 10 is limited by the stop surface 16.

According to fig. 1, the stop face 16 of the contact piece 2 cooperates with a stop face 20 formed on the carrier ring 10, wherein the stop face 20 on the carrier ring 10 and the stop face 16 of the contact piece 2 extend at an angle to the axis of the lifting rod 4.

Fig. 2 shows a second detail of the region of the regulating valve in which the guide mechanism for the lifting rod 4 is arranged. Features similar to those of figure 1 bear the same reference numerals in figure 2.

According to fig. 2, the stop is formed by a stop surface 24 on the carrier ring 10 and a stop surface 26 on the contact part 2. The stop surface 24 on the carrier ring 10 extends completely in a plane perpendicular to the axis of the lifting rod 4. The stop surface 26 on the contact part 2 extends in a first plane perpendicular to the lifting lever 4.

According to fig. 2, the recess 6 has a step 28, on which the guide ring 8 is supported, so that the axial position of the guide ring 8 is fixed and a gap is formed between the guide ring 8 and the carrier ring 10, which gap allows an axial movement of the carrier ring relative to the contact part 2 in the sense of a resilient outward expansion in the cross-sectional direction. The load of the annular spring 18 can thereby be adjusted independently of the guide ring 8 by means of the carrier ring 10.

Fig. 3a shows a contact-making member 38, which comprises a yoke 30, by which a lifting rod 32 is guided. The lifting rod 32 comprises a linear guide 34, by means of which the lifting rod 32 is guided in the yoke 30 in a rotationally fixed but axially displaceable manner. For electrically conductive contacting of the lifting rod 32, the contact piece 38 comprises a spherical roller 40, which is designed to be electrically conductive. The pressing force of the spherical roller 40 is set such that a rolling movement occurs on the rolling area 36 of the linear guide 34. Thereby, friction in the rolling area can be reduced and conduction contact can be ensured.

Figure 3b shows a detailed cross-sectional view of the spherical roller 40. According to a basic principle, the spherical roller 40 is a ball 44 rotatably mounted in the housing by means of a spring 42. The bearing of the ball 44 itself can also be realized preferably by means of a bearing bush with ball bearings to further reduce friction.

Fig. 4 shows a further concept of electrically conductive contacting, in which a slide rail 52, which is inclined at an acute angle to the lifting rod, is inserted into a contact piece 50, in which a conductive ball 54 is guided. The compressive force of the ball 54 on the lifter is facilitated by a spring 56 that axially compresses the spring. The spring 56 is supported on a locking ring 58.

Claims

1. A valve comprising a valve housing and a lifting rod (4,32) and a contact piece which is connected to the valve housing in an electrically conductive manner, characterized in that the lifting rod (4) is guided through the contact piece, the lifting rod (4) being movable relative to the contact piece, wherein an electrically conductive rotatable part rests on a rolling area of the lifting rod (4) or on a rolling area of a linear guide (34) which is fixedly connected to the lifting rod (4), wherein the electrically conductive rotatable part is pressed onto the rolling area with a pressing force, wherein the pressing force is selected such that the resulting static friction is greater than the braking force generated by the rotatable part.

2. A valve according to claim 1, wherein the rotatable part is a conductive annular spring (18) which surrounds the lifting rod under pretension, wherein the pretensioning of the annular spring generates a pressing force in the circumferential direction, wherein the annular spring (18) is also supported in a first lifting direction by an electrically conductive shoulder (15) arranged in the contact-making member, wherein the pretensioning of the annular spring (18) is coordinated in such a way that the annular spring rolls around its circumference when it bears against the shoulder and the lifting rod is moved in the first lifting direction, and the annular spring is also supported in a second lifting direction opposite to the first lifting direction by a carrier mounted axially movable relative to the contact-making member and axially movable relative to the lifting rod (4), wherein the first lifting direction (R1) is in the direction of the force of gravity, wherein the force of gravity of the carrier is dimensioned such that it ensures that the annular spring (18) bears against the shoulder (15) when the lifting rod is moved in the second lifting direction.

3. The valve of claim 2, wherein the annular spring is a helical coil.

4. Valve according to claim 2, characterized in that the weight of the carrier and the annular spring (18) are coordinated in such a way that, when the lifting rod (4) is moved in the second lifting direction, a twisting of the annular spring (18) about its circumferential axis is achieved, but the annular spring (18) remains against the shoulder (15).

5. A valve according to claim 3, wherein the weight force of the carrier is less than the pressing force of the annular spring (18) on the lifting rod (4).

6. A valve according to any one of the preceding claims 2 to 5, characterised in that the carrier is designed in the form of a ring.

7. A valve according to claim 2, wherein the contact member comprises a contact member housing and a separable closure member (12) which restricts movement of the carrier member in the second lifting direction.

8. A valve according to claim 7 wherein the closure member (12) includes lifter guide means.

9. Valve according to claim 7, wherein the closure member (12) comprises a closure flange or a clamping ring.

10. Valve according to claim 2, characterized in that the contact-making member has a stop (16) for the carrier in the first lifting direction, against which the carrier abuts after a predetermined compression of the annular spring (18) in the first lifting direction.

11. Valve according to claim 1, characterized in that the contact-making member is incorporated into the valve housing or is manufactured in one piece with the valve housing.

12. A valve according to claim 1, wherein the rotatable part comprises a ball of a spherical roller (40), which ball is biased by a spring (42), wherein the pressing force on the rolling area is provided by the spring force of the spring.

13. Valve according to claim 12, wherein the pressing force and the spring force are directed in the same direction towards the ball of the spherical roller (40).

14. Valve according to claim 1, characterized in that a surface (52) inclined relative to the lifting rod is made into the contact-making part, in which surface at least one ball biased in the lifting direction is guided.

15. A valve according to claim 14, wherein at least one ball biased by a spring bias in the lifting direction is guided in said surface.