JP2018159451A - Positioner vibration prevention structure of a valve control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To vibration isolate a positioner in a valve control device in which the positioner is connected to a valve drive part via not only a bracket but also an operation rod.SOLUTION: A positioner vibration prevention structure of a valve control device, comprises: an insertion hole 3 formed in a bracket 16; a fixation hole 4 formed in a positioner 13; a bolt 1 that is penetrated through the fixation hole 4 and inserted into the insertion hole 3 with a gap S; a flat washer 6 through which the bolt 1 is penetrated and provided on the opposite side of the positioner 13 of the bracket 16; a first vibration isolating component 7 through which the bolt 1 is penetrated and which is included between the positioner 13 and the bracket 16; a second vibration isolating component 8 through which the bolt 1 is penetrated and which fills the gap S within the insertion hole 3; a third vibration isolating component 9 through which the bolt 1 is penetrated and which is included between the bracket 16 and the flat washer 6; and a nut 2 for tightening the bolt 1 between the positioner 13 and the flat washer 6. The vibration isolating components 7, 8, and 9 are made of a raw material in which the characteristic frequency of the positioner 13 is 50 Hz or less and the attenuation ratio is 10% or more.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a positioner vibration isolation structure for a valve control device that performs vibration isolation for a positioner that controls a valve drive unit connected to a valve body.

  For example, in Patent Document 1, in a control valve in which a positioner is supported via a bracket on a valve drive unit (actuator body) connected to a valve body (valve box), a sand box in which the valve drive unit is filled with sand. The vibration isolating structure is shown in which the lower end of the bracket is fixed to the inner surface of the bottom plate of the sand box, and the positioner is supported on the upper end of the bracket.

  Further, for example, in Patent Document 2, a vibration isolating member formed in the shape of a cylindrical gap is formed by forming a mounting hole of a vibrating body or a fixed body so that there is a cylindrical gap between the trunk of the bolt. An anti-vibration fastening structure is shown in which a bolt is fastened by being fitted between a bolt trunk and a mounting hole of a vibrating body or a fixed body. Patent Document 2 further discloses that a vibration isolating member is interposed between the head or nut of the bolt and the vibrating body or fixed body. In addition, it is shown that the vibration-proof member in patent document 2 is a vibration-proof rubber.

Japanese Utility Model Publication No. 4-77080 JP-A-9-96340

  In the positioner, a lever is connected to a drive portion of the valve drive unit via an operating rod in order to feed back a valve opening degree in the valve body that has driven the valve body in the valve drive unit. That is, the positioner feeds back the valve opening degree in the valve body that has driven the valve body in the valve drive unit by moving the lever through the operating rod. The positioner transmits the movement of the lever to a spring-supported pilot stem. The position of the pilot stem in the sleeve changes with the movement of the lever, and the pressure of the air sent into the sleeve changes. This pressure change is converted into an electrical signal and output as a control signal for the valve drive unit. To do.

  As shown in Patent Document 1, such a positioner is supported by the valve body via a bracket because it feeds back the valve opening of the valve drive unit. For this reason, the vibration generated by the fluid flowing in the pipe is transmitted from the valve body to the bracket to vibrate the positioner. When the positioner vibrates, the pilot stem swings in the sleeve, collides with the sleeve and wears, and if the pilot stem is fixed in the sleeve, the valve control may be hindered.

  With respect to such an event of the positioner, it can be considered that the positioner is attached to the bracket of the valve drive unit by a vibration-proof fastening structure as in Patent Document 2. However, since the lever is connected to the valve drive unit through the operating rod because the lever is connected to the valve drive unit, the edge cannot be completely cut through the valve drive unit and the vibration isolation member. For this reason, it is preferable to use a vibration isolating member made of a relatively soft material in order to prevent vibration to the positioner. However, if it is too soft, the displacement becomes large, and as a result, it becomes difficult to suppress the oscillation of the pilot stem.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and prevents the positioner of a valve control device capable of isolating the positioner in a valve control device in which the positioner is connected to the valve drive unit not only via a bracket but also via an operating rod. An object is to provide a vibration structure.

  In order to achieve the above-mentioned object, a positioner vibration isolating structure for a valve control device according to an aspect of the present invention includes a valve body provided in a pipe, and a valve drive connected to the valve body to drive the valve body. Is attached to the valve body via a flat bracket and is connected to the valve drive unit via an operating rod, and the position in the sleeve is changed based on the operation of the operating rod. A positioner having a pilot stem that outputs a control signal to the valve drive unit, and a positioner vibration isolating structure of a valve control device, an insertion hole formed in the bracket, a fixing hole formed in the positioner, A bolt that penetrates through the fixing hole and is inserted through the insertion hole with a gap, and a bolt that is provided on the opposite side of the bracket from the positioner, pass through the bolt. A plain washer that is interposed between the positioner and the bracket and through which the bolt penetrates, and a second anti-vibration member that fills the gap in the insertion hole and through which the bolt penetrates. A third vibration isolating member interposed between the bracket and the flat washer and through which the bolt penetrates, and a nut for tightening the bolt between the positioner and the flat washer. The vibration member is made of a material having a natural frequency of the positioner of 50 Hz or less and a damping ratio of 10% or more.

  Further, in the positioner vibration isolating structure of the valve control device according to one aspect of the present invention, the plane on which the first vibration isolating member contacts on the positioner side and the bracket side is greater than the outer diameter of the first vibration isolating member. It is preferable that the flat surface on which the third vibration isolating member comes into contact with the bracket side and the plain washer is formed larger in diameter than the outer diameter of the third vibration isolating member.

  Further, in the positioner vibration-proof structure of the valve control device according to one aspect of the present invention, the bolt includes a screw portion and a rod-like portion that does not have the screw portion, and the rod-like portion is each of the above-described rod-like portions. It is preferable that the anti-vibration member is provided.

  Further, in the positioner vibration isolating structure of the valve control device according to one aspect of the present invention, the plane on which the first vibration isolating member contacts on the positioner side, and the plane on which the first vibration isolating member contacts on the bracket side. The first vibration isolation member and the third vibration isolation member are inserted into the plane where the third vibration isolation member contacts on the bracket side and the plane where the third vibration isolation member contacts with the plain washer. It is preferable that a concave portion is formed.

  According to the present invention, the valve transmitted between the positioner and the bracket and between the bracket and the bolt is non-contacted by each vibration isolating member and transmitted to the bracket by the vibration isolating member softer than natural rubber. Vibration is prevented so that the vibration of the main body is not transmitted to the positioner side. According to the present invention, by supporting the positioner with each vibration isolating member so that the natural frequency of the positioner is 50 Hz or less, it is possible to prevent the occurrence of vibration that causes the pilot stem to contact the sleeve and wear. In addition, according to the present invention, since each vibration isolation member is made of a material having a damping ratio of 10% or more, the displacement of the positioner, which can be increased by being made of a material softer than natural rubber, can be kept small. Thus, it is possible to prevent an error in the control signal due to relative displacement with the lever that transmits the operation of the operating rod to the positioner. If only the positioner fluctuates and the lever side is fixed, the lever will rotate due to relative displacement, and the valve opening may be misrecognized, and an incorrect control signal may be output.

FIG. 1 is a schematic configuration diagram of a valve control device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the positioner vibration isolation structure of the valve control device according to the embodiment of the present invention. FIG. 3 is a cross-sectional view of a positioner vibration isolation structure of the valve control device according to the embodiment of the present invention. FIG. 4 is a cross-sectional view of the positioner vibration isolation structure of the valve control device according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic configuration diagram of a valve control device according to the present embodiment. The valve control device shown in FIG. 1 includes a valve body 11, a valve drive unit 12, and a positioner 13.

  The valve body 11 is interposed in the middle of the pipe 14 and changes the flow rate of the fluid flowing through the pipe.

  The valve drive unit 12 drives the valve body 11, and includes a drive unit 12 </ b> A that constitutes an actuator, and an operation unit 12 </ b> B that transmits the operation of the drive unit 12 </ b> A to the valve body 11. It is fixed to.

  The positioner 13 mainly includes a feedback mechanism 13A and an output unit 13B. The feedback mechanism 13A includes an operation rod 13Aa that is connected to the operation unit 12B of the valve drive unit 12 and operates in accordance with the operation of the operation unit 12B, and a lever 13Ab that receives the operation of the operation rod 13Aa. The lever 13Ab is provided so as to be rotatable with respect to the casing 13C of the positioner 13, and swings in response to the operation of the operation rod 13Aa. The output unit 13B is provided in the casing 13C of the positioner 13, and includes a sleeve 13Ba and a pilot stem 13Bb. Air is sent to the inside of the sleeve 13Ba. The pilot stem 13Bb is provided so that the position in the sleeve 13Ba can be changed, and the position changes in conjunction with the swing of the lever 13Ab of the feedback mechanism 13A. The output unit 13B outputs an open / close signal based on a change in pressure in the sleeve 13Ba when the position of the pilot stem 13Bb in the sleeve 13Ba changes in conjunction with the swing of the lever 13Ab. The opening / closing signal is sent to the controller 15, and the controller 15 transmits a control signal corresponding to the opening / closing signal to the driving unit 12 </ b> A of the valve driving unit 12. The drive unit 12A is driven according to the control signal.

  The positioner 13 has a casing 13 </ b> C attached to the valve body 11 via a bracket 16. As described above, in the positioner 13, it is desirable that the operation rod 13Aa of the feedback mechanism 13A is connected to the operation unit 12B of the valve drive unit 12, and that the operation rod 13Aa can be appropriately operated in accordance with the operation of the operation unit 12B. For this reason, the positioner 13 vibrates with the vibration of the valve body 11 due to the fluid flow.

  However, since the positioner 13 has a configuration in which the pilot stem 13Bb outputs an opening / closing signal by moving in the sleeve 13Ba in the output portion 13B, when the pilot stem 13Bb comes into contact with the sleeve 13Ba due to vibration and wear occurs. As a result, the pilot stem 13Bb may stick to the sleeve 13Ba, which may hinder valve control.

  For this reason, in this embodiment, the positioner vibration isolating structure of a valve control apparatus is provided. 2 to 4 are cross-sectional views of the positioner vibration isolation structure of the valve control device according to the present embodiment.

  The bracket 16 to which the positioner 13 is attached is formed as a plate-like member from a hard material (for example, carbon steel or stainless alloy steel) that has little deflection. As shown in FIG. 1, the bracket 16 is continuous along a part of a lower edge, one side edge, and a part of the upper edge with respect to the casing 13 </ b> C of the positioner 13 formed in a rectangular shape. And it is formed in a bowl shape. The positioner 13 has a lower edge and a part of an upper edge of the casing 13C attached to the bracket 16 by a plurality of bolts 1, respectively.

  As shown in FIG. 2, the bolt 1 passes through the casing 13 </ b> C of the positioner 13, is inserted into the bracket 16, and is fastened to each other between the nut 2 and the bolt head 1 </ b> C by tightening with the nut 2. In the present embodiment, the nut 2 is constituted by a double nut and is not easily loosened.

  The bracket 16 is formed with an insertion hole 3 through which the entire circumference of the bolt 1 is inserted with a gap S. The insertion hole 3 preferably has a circular inner shape in consideration of formability, but may not be formed in a circular shape. In addition, both surfaces of the plate-like member around the insertion hole 3 of the bracket 16 are formed as flat surfaces.

  The casing 13C of the positioner 13 is formed with a fixing hole 4 through which the bolt 1 passes through a plate-shaped portion. The fixing hole 4 is a circular hole formed in an inner diameter including a clearance that can penetrate the bolt 1 and is equivalent to the outer diameter of the bolt 1. In addition, it is preferable that both plate-like surfaces around the fixing hole 4 of the casing 13C are formed as a flat surface. However, when the flat surface is not a flat surface, a flat washer 5 through which the bolt 1 passes is provided as shown in FIG. It may be. The flat washer 5 is provided at least on the side facing the bracket 16 side.

  Further, a flat washer 6 through which the bolt 1 passes is provided on the opposite side of the positioner 13 of the bracket 16 from the casing 13C.

  Between the casing 13 </ b> C of the positioner 13 and the bracket 16, the first vibration isolation member 7 is provided. The first vibration isolation member 7 is formed with an outer diameter larger than the inner diameter of the insertion hole 3, and a fixing hole 7 </ b> A through which the bolt 1 passes is formed.

  A second vibration isolating member 8 is provided in the insertion hole 3 of the bracket 16 so as to fill the gap S around the entire circumference of the bolt 1. The second vibration isolation member 8 is formed in an outer shape that matches the inner shape of the insertion hole 3, and a fixing hole 8 </ b> A that allows the bolt 1 to pass therethrough is formed.

  Between the bracket 16 and the flat washer 6, a third vibration isolating member 9 is provided. The third vibration isolation member 9 is formed with an outer diameter larger than the inner diameter of the insertion hole 3 and a fixing hole 9 </ b> A through which the bolt 1 passes.

  The first anti-vibration member 7, the second anti-vibration member 8, and the third anti-vibration member 9 are made of a material having a natural frequency of the positioner 13 of 50 Hz or less and a damping ratio of 10% or more. Therefore, as a material to be applied, a soft and highly attenuated silicon rubber or the like is preferable. Note that the second vibration isolation member 8 may be formed integrally and continuously with the first vibration isolation member 7 and the third vibration isolation member 9.

  The positioner vibration isolating structure configured as described above includes the first vibration isolating member 7 that is interposed between the casing 13C of the positioner 13 and the bracket 16 and through which the bolt 1 passes, and the bolt in the insertion hole 3 of the bracket 16. 1 and a second vibration isolating member 8 through which the bolt 1 penetrates and a third vibration isolating member 9 interposed between the bracket 16 and the plain washer 6 and through which the bolt 1 penetrates. Each of the vibration isolation members 7, 8, 9 is made of a material having a natural frequency of the positioner 13 of 50 Hz or less and a damping ratio of 10% or more.

  According to the positioner vibration isolating structure of the present embodiment, the edges of the positioner 13 between the casing 13C and the bracket 16 and between the bracket 16 and the bolt 1 are non-contacted by the respective vibration isolating members 7, 8, and 9. In addition, since each of the vibration isolation members 7, 8, 9 is made of a material softer than natural rubber, the vibration of the valve body 11 transmitted to the bracket 16 is prevented from being transmitted to the casing 13 </ b> C side of the positioner 13. . Furthermore, according to the positioner vibration isolating structure of the present embodiment, the pilot stem 13Bb is attached to the sleeve 13Ba by supporting the positioner 13 with the vibration isolating members 7, 8, and 9 so that the natural frequency of the positioner is 50 Hz or less. Generation of vibrations that come into contact and wear can be prevented. Moreover, according to the positioner vibration isolating structure of the present embodiment, each of the vibration isolating members 7, 8, and 9 is made of a material having a damping ratio of 10% or more (100% or less), thereby being made of a material softer than natural rubber. Accordingly, the displacement of the positioner 13 that can be increased can be suppressed to a small value, and an error in the control signal due to the relative displacement between the positioner 13 and the lever 13Ab can be prevented. If only the positioner 13 fluctuates and the lever 13Ab side is fixed, the lever 13Ab rotates due to relative displacement, and the valve body 11 opening degree is misrecognized, and an incorrect control signal may be output. .

  Moreover, according to the positioner vibration isolating structure of the present embodiment, if each of the vibration isolating members 7, 8, 9 is made of silicon, permanent deformation is small compared to natural rubber. There is no need to press down, and the number of parts can be reduced.

  For each of the vibration isolation members 7, 8, and 9, the vibration transmitted from the valve body 11 to the bracket 16 is not transmitted to the casing 13 </ b> C side of the positioner 13, and the control signal is based on the relative displacement between the positioner 13 and the lever 13 </ b> Ab. In order to remarkably obtain the effect of preventing the error, it is preferable that each of the vibration isolation members 7, 8, 9 has a rigidity with which the natural frequency of the positioner 13 is 30 Hz. The natural frequency of 30 Hz includes a range of about ± 5 Hz.

  Further, in the positioner vibration isolating structure of the present embodiment, as shown in FIG. 2, the plane on which the first vibration isolating member 7 contacts on the casing 13 </ b> C side and the bracket 16 side of the positioner 13 (in FIGS. 2 to 4, the flat washer). 5 and the plane 16a of the bracket 16 on the side of the positioner 13 are formed to have a larger diameter than the outer diameter D1 of the first vibration isolation member 7, and face the opposite side of the bracket 16 and the positioner 13 of the bracket 16 from each other. The flat surface washer 6 provided in contact with the third vibration isolation member 9 (in FIG. 2, the plane 16b opposite to the positioner 13 of the bracket 16 and the flat surface 6a of the plain washer 6) is the third vibration isolation member. 9 is formed to have a larger diameter than the outer diameter D2.

  That is, as shown in FIGS. 2 to 4, the flat surface 5 a of the flat washer 5 and the flat surface 16 a of the bracket 16 on the positioner 13 side are formed to have an outer diameter larger than the outer diameter D <b> 1 of the first vibration isolation member 7. The plane 16b opposite to the positioner 13 and the plane 6a of the flat washer 6 are formed to have an outer diameter larger than the outer diameter D2 of the third vibration isolating member 9, so that the first vibration isolating member 7 and the third anti-vibration member 7 Since the vibration isolator 9 is sandwiched between the larger planes 5a and 16a and the planes 16b and 6a, the first vibration isolator 7 is tightened from the planes 5a and 16a and the planes 16b and 6a when tightening with the bolt 1 and the nut 2. Since the third vibration isolating member 9 is held without deviating, the vibration isolating effect can be sufficiently exhibited.

  Further, in the positioner vibration isolating structure of the present embodiment, as shown in FIGS. 3 and 4, the bolt 1 is configured to include a screw portion 1A and a rod-like portion 1B that does not have the screw portion 1A. Yes. And it is preferable that the rod-shaped part 1B is provided penetrating each anti-vibration member 7,8,9.

  That is, as shown in FIGS. 3 and 4, the screw portion 1 </ b> A is configured not to contact each of the vibration isolation members 7, 8, 9. For this reason, it is possible to prevent the vibration isolating members 7, 8 and 9 made of a relatively soft material from being damaged and torn by the unevenness of the groove of the screw portion 1 </ b> A, and to maintain the vibration isolating effect.

  In the present embodiment, when the above configuration is adopted, the rod-shaped portion 1B of the bolt 1 is lengthened and the threaded portion 1A is shortened compared to the configuration of FIG. 2, and the threaded portion 1A is provided between the nut 2 and the plain washer 6. A thick washer 10 is provided so that the nut 2 can be screwed onto the screw portion 1A. The flat washer 6 may be thick.

  Further, in the positioner vibration isolating structure of the present embodiment, as shown in FIG. 4, the plane on which the first vibration isolating member 7 contacts on the casing 13 </ b> C side of the positioner 13 (the plane 5 a of the flat washer 5) and the bracket 16 side. The first anti-vibration member 7 is in contact with the plane (plane 16a of the bracket 16 on the positioner 13 side), and the bracket 16 side is in contact with the third anti-vibration member 9 (the plane on the opposite side of the bracket 16 to the positioner 13). 16b), and a flat washer 6 provided on the opposite side of the bracket 16 to the opposite side of the positioner 13, the flat surface 6a with which the third vibration isolating member 9 contacts is the first vibration isolating member 7 or the third vibration isolating member. It is preferable that recesses 5b, 16c, 16d and 6b into which 9 is inserted are formed.

  That is, as shown in FIG. 4, the flat surface 5 a of the flat washer 5 is formed as the bottom surface of the recess 5 b into which the first vibration isolation member 7 is fitted, and the flat surface 16 a on the positioner 13 side of the bracket 16 is the first vibration isolation member. 7 is formed as the bottom surface of the recess 16c into which the bracket 7 is inserted. The flat surface 16b opposite to the positioner 13 of the bracket 16 is formed as the bottom surface of the recess 16d into which the third vibration isolator 9 is inserted, and the plane 6a of the plain washer 6 is The bottom surface of the recess 6b into which the third vibration isolating member 9 is inserted is formed. For this reason, the first vibration isolator 7 is surrounded by the recess 5b and is restrained by the flat surface 5a, and is surrounded by the recess 16c and restrained by the flat surface 16a, and the third vibration isolator 9 is surrounded by the recess 16d. While being restrained by the flat surface 16b, it is restrained by the flat surface 6a while being surrounded by the recess 6b.

  The first vibration isolation member 7 and the third vibration isolation member 9 made of a relatively soft material so that the natural frequency of the positioner 13 is 50 Hz or less are likely to be laterally shifted because the pressing force of the bolt 1 and the nut 2 is small. By shifting laterally, the support conditions may change and the vibration isolation effect may be reduced. Further, when the bolts 1 and the nuts 2 are tightened to spread outward and laterally shift, the support conditions may change and the vibration isolation effect may be reduced. In this respect, according to the positioner vibration isolating structure of the present embodiment, the first vibration isolating member 7 and the third vibration isolating member 9 are fitted into the recesses 5b, 16c, 16d, and 6b, and lateral displacement to the outside is suppressed. Since the pressing force of the bolt 1 and the nut 2 is obtained and the support conditions are constant, it is possible to prevent the vibration-proofing effect from being lowered.

DESCRIPTION OF SYMBOLS 1 Bolt 1A Screw part 1B Rod-like part 1C Bolt head 2 Nut 3 Insertion hole 4 Fixing hole 5 Plain washer 5a Plane 5b Recess 6 Plain washer 6a Plane 6b Recess 7 First vibration isolation member 7A Fixing hole 8 Second vibration isolation member 8A fixation Hole 9 Third vibration isolating member 9A Fixing hole 10 Washer 11 Valve body 12 Valve drive unit 12A Drive unit 12B Actuator 13 Positioner 13A Feedback mechanism 13Aa Actuation rod 13Ab Lever 13B Output unit 13Ba Sleeve 13Bb Pilot stem 13C Casing 14 Pipe 15 16 Bracket 16a plane 16b plane 16c recess 16d recess D1 outer diameter D2 outer diameter S gap

Claims (4)

A valve main body provided in a pipe, a valve driving unit connected to the valve main body to drive the valve main body, and attached to the valve main body via a flat bracket and to the valve driving unit And a positioner having a pilot stem connected via an operating rod and changing a position in the sleeve based on the operation of the operating rod and outputting a control signal to the valve drive unit, Because
An insertion hole formed in the bracket;
A fixing hole formed in the positioner;
A bolt that penetrates the fixing hole and is inserted into the insertion hole with a gap;
A flat washer provided opposite to the positioner of the bracket and through which the bolt passes;
A first vibration isolating member interposed between the positioner and the bracket and through which the bolt passes;
A second vibration isolating member that fills the gap in the insertion hole and penetrates the bolt;
A third vibration isolating member interposed between the bracket and the plain washer and through which the bolt passes;
A nut for tightening the bolt between the positioner and the plain washer;
With
Each of the vibration isolation members is a positioner vibration isolation structure of a valve control device made of a material having a natural frequency of the positioner of 50 Hz or less and a damping ratio of 10% or more.   A plane on which the first vibration isolation member contacts on the positioner side and the bracket side is formed to have a larger diameter than an outer diameter of the first vibration isolation member, and the third side is formed on the bracket side and the flat washer. The positioner vibration isolation structure of the valve control device according to claim 1, wherein a plane in contact with the vibration isolation member is formed to have a larger diameter than an outer diameter of the third vibration isolation member.   The said bolt is comprised including a thread part and a rod-shaped part which does not have a thread part, and the said rod-shaped part is penetrated and provided by each said vibration isolating member. Positioner anti-vibration structure of the valve control device.   A plane on which the first vibration isolation member contacts on the positioner side, a plane on which the first vibration isolation member contacts on the bracket side, a plane on which the third vibration isolation member contacts on the bracket side, and The flat surface which the said 3rd anti-vibration member contacts with a flat washer is formed with the recessed part which inserts said 1st anti-vibration member and the said 3rd anti-vibration member. Positioner anti-vibration structure of the valve control device.

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