DE102012014515A1 - Arrangement for driving stopcock using cone plug, has driven cylinder, which is connected to upper end of spindle in rotationally fixed manner, which carries tapered plug at lower end - Google Patents

Abstract

The arrangement has a housing (12), where a hollow drive cylinder (4) is arranged in a coaxially and rotatably mounted manner. The hollow drive cylinder is rotatably connected with a drive shaft (3). A driven cylinder (5) is supported in the coaxial hollow drive cylinder movable in an axial and radial manner. The driven cylinder is connected to the upper end of a spindle (6) in a rotationally fixed manner, which carries a tapered plug (7) at a lower end. The tapered plug is rotationally connected with the spindle, where drive cylinder bears a pin (13) in the upper portion.

Description

The invention relates to an arrangement for driving a stopcock with conical poppets, as used in particular in the chemical and petrochemical industry for shutting off and opening fluid streams leading lines.

Such shut-off valves present themselves as a fitting which completely releases or completely blocks the passage of a fluid in a pipeline. A stopcock is actuated by a 90 ° rotation of the closing element. The construction of shut-off valves is completely leakproof - this applies both to the connected piping and to the spindle for operating the stopcock.

As closing elements of a stopcock find so-called chicks use. These chicks may be in the design of a ball plug or a cone plug. The design as a plug has various advantages in terms of production and sealing characteristics and has become established in the shut-off valves for special operating conditions in industrial plants.

Unlike valves, where the flow of the flowing fluid can be infinitely adjusted as needed, it is not intended to set intermediate positions for shut-off valves. Stopcocks regularly only know two states - open or closed.

In the sanitary and heating engineering usually used for water valves, even if they are often referred to as tap or faucet. For gas shut-off valves are mandatory. Shut-off valves are suitable for smallest to large nominal sizes and nominal pressure levels. They have the advantage of minimal flow resistance, since there are usually no flow deflections or recesses and the medium passes the fitting like a straight piece of piping.

Furthermore, the short operating times can be an advantage, since the shut-off with the help of the actuating spindle must perform only a 90 ° rotation. The 90 ° rotation of the actuating spindle in the stuffing box seal is also advantageous in terms of leakage behavior compared to valves and slides. In contrast to valves and slides, no or only little linear lifting movements are required by the stuffing box for the actuation, which has a favorable effect on the service life and the sealing behavior. The stopcocks are therefore well suited for toxic, flammable or other dangerous fluids.

Disadvantages are the following facts: The reliable blocking function of shut-off valves can be very limited by contamination of the fluid. Shut-off valves can not control or restrict the fluid flow, moreover, their space requirement in a pipeline is comparatively large. When closing the stopcock a small part of the medium remains in the bore of the closing element.

The operation of shut-off valves, as they are the subject of the invention, is carried out regularly via electric, pneumatic or hydraulic actuators with which the conical plug is rotated as a closing element via a spindle from the closed to the open position or vice versa. In this case, a rotation angle of 90 ° is realized.

Since the reliability of the locking function is largely dependent on the exact fit of the closing element in his seat, the tight fit of the plug in the seat initially considerable forces to rotate the spindle-chick unit apply. This is on the one hand disadvantageous because both the respective drive units electrical, pneumatic or hydraulic type in itself and the power-transmitting spindle must be designed according to the large necessary torques, which leads to increased material and manufacturing costs as well as increased space requirements.

On the other hand, performed with strong torques in close fitting rotational movements of the plug in its conical seat regularly lead to increased wear of the chick and the seat surfaces, which in turn entails increased maintenance and repair costs and leakage hazards.

Efforts have therefore been made with numerous solutions proposed by the prior art to overcome these disadvantages.

For example, in the British publication GB 461,653 proposed a solution in which the chick is slightly lifted out of its seat during its quarter turn. In this invention, therefore, a nut is integrated into the actuating element, which forms a screw cap as part of the actuating spindle and is coupled to said spindle by means of a lost-motion clutch.

In this way, rotation of the actuating spindle by means of the actuating lever causes the chick to lift off its seat before being rotated to the open position. Conversely, causes a rotation of the actuating lever in the Closing direction that the chick is lowered back into its seat after returning to the closed position.

A disadvantage of this solution is that the arrangement of the lost-motion coupling represents a significant additional manufacturing and assembly costs.

Also in the British publication GB 595,700 An arrangement is proposed which is intended to solve the problem of, on the one hand, necessary high sealing pressure in the conical plug seat and, on the other hand, the desired low actuating moment during the rotation of the plug.

First, a cone-chick-tap is provided whose extremely precise conical surface pairing in conjunction with strong axial Endlagerfedern at the spindle end ensures the desired sealing effect in the closed state of the plug cock. To relieve the pressure during the rotational movement of the said plug cock on additional facilities that cancel the spring pressure during the rotational movement.

This prevents wear of the conical surfaces of the chick seat and chicks. At the moment of commencement of opening said repository of the actuating spindle is completely relieved, so that the chick can be rotated without unnecessary friction.

A cone-and-chick-type tap of the type described has, as a relief mechanism, helical or helical teeth acting on a relief cam, which, by means of its axial component, adapts the final pressure to the state of movement.

This proposed solution is associated with a significant additional manufacturing and assembly costs.

The current state of the industrially used technology for the reliable and gentle drive of conical chick taps is represented by the so-called Wedgetorque operator of the company PACIFIC VALVE [s. PacificValvesWedgeplugBrochureCV-408.pdf].

• 1. das Küken vom Sitz anzulüften,
• 2. das Küken um 90° zu drehen und
• 3. das Küken in den Sitz abzusenken, um wieder Dichtheit der Armatur herzustellen.

The drive concept of such a metallic sealing cone-chick-cock is also

• 1. ventilate the chick from the seat,
• 2. Turn the chick by 90 ° and
• 3. lower the chick into the seat to restore tightness of the fitting.

This technically very demanding task is realized by a transmission, the so-called Wedgetorque or Lifttorque operator already mentioned above:
While on the actuating spindle of the plug cock only acts as a normal slide a rotary drive, provides a gear below it for the lifting, rotating and lowering the actuating spindle with the chick.

The internal kinematics of this transmission is complex, which in turn has the disadvantage of high additional manufacturing, assembly and maintenance costs.

It is therefore the object to develop an arrangement for driving a stopcock with conical poppets, with the necessary for reliable and low-wear operation of the stopcock movement for the lifting, rotating and lowering the actuating spindle with the chicks are generated in a simple and low-effort manner can.

This object of the invention is achieved by the means of the main claim, wherein further subordinate claims include particularly advantageous embodiments of the invention.

The invention will be explained in more detail below using an exemplary embodiment.

The accompanying drawings show in

1 : A sectional view of an inventively manufactured arrangement for driving a stopcock with conical plug

2 : The schematic representation of the cam tracks for the movement of the present invention arranged actuating rollers as settlement and

3 : the schematic representation of the movement sequence of the curved path 10 (Hollow drive cylinder) and the pin 13 (Driven cylinder 5 ) and the actuating rollers located on it 9.1 and 9.2 as a settlement presentation.

In the exemplary embodiment, the arrangement according to the invention for driving a stopcock with conical plug according to 1 a housing 12 , consisting of an upper housing part 1 and a housing lower part 2 , on, being axially out of the upper housing part 1 a drive shaft 3 led out, with a hollow drive cylinder 4 connected is. Housing top 1 and housing base 2 each have an upper housing cover 12.1 or lower housing cover 12.2 ,

The housing 12 is rotatably connected to the stopcock. The drive hollow cylinder 4 is coaxial in the housing 12 , consisting of upper housing part 1 and housing base 2 , arranged and is rotatable in rolling bearings 14 stored.

An output cylinder 5 is in turn coaxial in the drive hollow cylinder 4 arranged. This output cylinder 5 is radial and axial in the drive hollow cylinder 4 movably arranged and self-rotatably with the upper end of a spindle 6 connected, which in turn at its lower end a conical chick 7 wearing.

The cone chick 7 is in turn rotatable with the spindle 6 connected. spindle 6 and cone chicks 7 form a chick spindle unit 8th ,

The output cylinder 5 carries in its upper part two pins 13 with actuating rollers 9.1 and 9.2 , where the pins 13 with the actuating rollers 9.1 and 9.2 on the circumference of the output cylinder 5 offset by 180 °.

Every pin 13 carries two actuating rollers 9.1 and 9.2 , which are at a small distance from each other independently on their respective pin 13 can turn. The actuating rollers 9.1 and 9.2 are arranged on the pins so that they turn on curved tracks 10 respectively. 11 which can roll in the walls of drive hollow cylinder 4 and housing 12 available.

These curved tracks 10 and 11 are formed by the fact that in the walls of hollow drive cylinder 4 and housing 12 Breakthroughs are arranged whose interfaces in the cylinder walls of hollow drive cylinder 4 and housing 12 Running surfaces for the actuating rollers 9 form.

Here are each transverse to the longitudinal axis of the spindle 6 towards the chick 7 existing interfaces of the openings in the cylinder walls of hollow drive cylinder 4 and housing 12 the functionally important curved paths 10 and 11 as they are in 2 are shown.

The aforementioned inventive components of the arrangement for driving a stopcock with conical poppets allow the following operation:
The opening or closing of the shut-off cock with conical plug is triggered by the introduction of a torque via the drive shaft 3 in the drive hollow cylinder 4 , With the consequent rotational movement of the hollow drive cylinder 4 move concurrently, but offset by 180 °, the interfaces of the openings in the cylinder wall of hollow drive cylinder 4 ,

On through the interfaces in the cylinder walls of hollow drive cylinder 4 formed curved paths 10 become the actuating rollers 9.2 taken rolling and follow their course.

There on the cones 13 two actuators each 9.1 and 9.2 are arranged, each of which is the role 9.2 the curved path 10 the interface of the openings in the cylinder wall of hollow drive cylinder 4 , each having a different role 9.1 but the curved path 11 the interface of the openings in the cylinder wall of housing 12 follows, done by the in the curved paths 10 and 11 Given degrees of freedom a lifting, rotating and lowering the output cylinder 5 ,

How out 2 Obviously, they are the curved paths 10 and 11 forming interfaces of the openings in the cylinder walls of hollow drive cylinder 4 and housing 12 designed so that the actuating rollers 9.1 and 9.2 not just a radial movement on the curved paths 10 and 11 experienced, but also be made to perform an axial movement according to the Kurvenbahngestaltung.

By coupling the respective courses of the curved paths 10 and 11 following actuating rollers 9.1 and 9.2 on their common pin is thus by a rotational movement of the hollow drive cylinder 4 the output cylinder 5 by unrolling the actuating roller 9.2 on the upwardly inclined interface of the curved path 10 forced out of the lowered position axially upward, since the stationary curved track 11 of the housing 12 by their shape only an axial movement of the actuating roller 9.1 allows.

As the output cylinder 5 rotationally fixed with the spindle 6 and the chick 7 all his movements are also on spindle 6 and chicks 7 transferred and thus the spindle 6 and the chick 7 be ventilated. Upon further rotation of the hollow drive cylinder 4 becomes the output cylinder 5 as long as axially ventilated as the actuating rollers 9.1 in the axial part of the curved paths 11 of the housing 12 are axially constrained. Only after the center of the cones 13 and thus the center of the actuating rollers 9.1 the horizontal of the interfaces of the openings in the cylinder wall from the housing 12 ie the curved paths 11 - achieve, is omitted upon further rotation of the hollow drive cylinder 4 the axial positive guidance of the actuating roller 9.1 and is due to the shape of the curved paths 11 transformed into a radial forced operation.

Upon reaching the direction change from the axial to the radial movement of the pins 13 and its actuating roles 9.1 and 9.2 is it? inclined interface of the openings in the cylinder walls of the hollow drive cylinder 4 ie the curved path 10 - in a horizontal over. By the further rotation of the hollow drive cylinder 4 becomes the actuating roller 9.2 through the then downward inclined boundary surface of the openings in the cylinder walls of the hollow drive cylinder 4 ie the curved path 10 , and the radial positive guidance of the actuating rollers 9.1 the breakthroughs in the cylinder walls of the housing 12 ie the curved path 11 - forced to rotate or radial movement.

The radial movement of the pins 13 and the actuating rollers arranged on them 9.1 and 9.2 and thus also the output cylinder 5 perform these components until the actuators 9.1 the axial interface of the apertures from the housing 12 (Curved track 11 ) to reach. Through the downwardly inclined interface of the openings in the cylinder walls of the hollow drive cylinder 4 (Curved track 10 ) and the axial positive guidance of the openings of the housing 12 (Curved track 11 ) forces the further rotation of the hollow drive cylinder 4 the output cylinder 5 to an axial lowering movement.

An opposite rotational movement of the hollow drive cylinder 4 has an opposite lifting, turning and lowering of the output cylinder result.

After, for example, the rotation of the chick 7 from the open position with simultaneous lifting is the chick 7 lowered to the end of the rotational movement after a 90 ° rotation in the closed position back to the seat and seals reliably.

By the design of the curved paths 10 and 11 So it is possible, at the same time with the pure rotary motion of the hollow drive cylinder 4 to initiate a lifting, turning and lowering movement, which is a low-wear operation of the chick 7 allows. For example, by raising the spindle 6 caused picking out of the chick 7 from his seat only a slight friction of the chick 7 on the seats result.

2 shows, by way of example, the sequences of interfaces which are also described, while the 3 illustrates the operating principle of the arrangement for driving a stopcock with conical plug.

In 1 is a sectional view of an exemplary structural design of an inventive arrangement for driving a stopcock with conical plug shown. From her conceivable embodiments of an overall arrangement of conical plug cock, drive and drive motor and a housing cover can be seen, which protects the area of the cylinder wall openings from external interference.

In the embodiment shown, an exemplary arrangement has been described in an exemplary application. However, the invention includes all other arrangements with different further components in which by means of the inventive concept, a low-wear drive a stopcock is made with conical plug.

With the application of the arrangement according to the invention very large cost savings for the production and operation of plug valve drives can be achieved in which can be dispensed with complex gear structures and yet a very low-wear and low-maintenance operation of shut-off valves with conical chicks is achieved.

Just as advantageous, in contrast to transmission solutions significantly lower space requirements of the arrangement according to the invention for driving a stopcock with conical plug, which allows much smaller dimensions of the drives.

The essence of the invention can be seen in the solution, the necessary lifting of the chick 7 out of his seat by a surprisingly easy to implement curved path control.

LIST OF REFERENCE NUMBERS

1

Housing top

2

Housing bottom

3

drive shaft

4

Drive hollow cylinder

5

driven cylinder

6

spindle

7

chick

8th

Chick spindle unit

9.1

actuating rollers

9.2

actuating rollers

10

cam track

11

cam track

12

casing

12.1

Upper housing cover

12.2

Lower housing cover

13

spigot

14

roller bearing

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• GB 461653 [0012]
• GB 595700 [0015]

Claims (5)

Arrangement for driving a stopcock with conical plug, • a housing ( 12 ), in which a hollow drive cylinder ( 4 ) is arranged coaxially and rotatably mounted, which with a drive shaft ( 3 ) is rotatably connected, • while an output cylinder ( 5 ) in turn coaxially axially and radially movable in the drive cylinder ( 4 ) and • rotatably with the upper end of a spindle ( 6 ) which in turn has at its lower end a conical chick ( 7 ), whereby the conical chick ( 7 ) in turn rotatable with the spindle ( 6 ) and • the output cylinder ( 5 ) in its upper region at least one pin ( 13 ) with two actuating rollers ( 9.1 and 9.2 ), wherein the actuating rollers ( 9.1 and 9.2 ) on the pin ( 13 ) are arranged so that they on curved paths ( 10 and 11 ), • in the walls of hollow drive cylinder ( 4 ) and housing ( 12 ) are present and • formed by grooves and / or openings in the hollow drive cylinder ( 4 ) and in the housing ( 12 ) are arranged, • their interfaces in the cylinder walls of hollow drive cylinder ( 4 ) and housing ( 12 ) Running surfaces for the actuating rollers ( 9.1 and 9.2 ) form. Arrangement for driving a stopcock according to claim 1, in which the output cylinder ( 5 ) in its upper end two pins ( 13 ) with actuating rollers ( 9.1 and 9.2 ), wherein the pins ( 13 ) with the actuating rollers ( 9.1 and 9.2 ) on the circumference of the output cylinder ( 5 ) offset by 180 °. Arrangement for driving a shut-off cock according to claim 1, in which the housing ( 12 ) an upper housing cover ( 12.1 ) and a lower housing cover ( 12.2 ) and • the upper housing cover ( 12.1 ) a breakthrough for the drive shaft ( 3 ), while the lower housing cover ( 12.2 ) a breakthrough for the spindle ( 6 ) having Arrangement for driving a stopcock according to claim 1, in which the hollow drive cylinder ( 4 ) on rolling bearings ( 14 ) is rotatably mounted. Arrangement for driving a stopcock according to claim 1, in which the housing ( 12 ) from an upper housing part ( 1 ) and a housing lower part ( 2 ) consists.

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