JP2019065967A - Fluid controller with fastening device - Google Patents

Abstract

To provide a fluid controller having a fastening device, the fastening device configured to automatically refastening a gland packing provided in a valve.SOLUTION: A fluid controller comprises: a valve body 2 having a communication part 24 communicating with an inlet flow passage 21 and an outlet flow passage 22; a valve element 3 disposed in the communication part 24; a drive mechanism 7 configured to drive the valve element 3; a shaft body 4 penetrating through the valve body 2, and connecting the drive mechanism 7 and the valve element 3; a gland packing 40 provided around the shaft body 4, and configured to seal a gap between the shaft body 4 and the valve body 2; a gland nut 50 screwed into the valve body 2, and configured to press the gland packing 40; and a fastening device 10 configured to automatically fasten the gland nut 50.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a fluid controller having a clamping device that automatically tightens a gland packing provided on a valve.

A valve such as a ball valve can control a fluid by driving a valve body disposed in the valve body by a drive member provided outside the valve body, but connecting the valve body and the drive member It is desirable to prevent fluid from leaking between the stem, which is a member, and the valve body.
For example, in the ball valve described in Patent Document 1, the gland packing provided between the stem and the valve body is pressed from above by the tightening of the gland nut and deformed to leak fluid along the stem axis. Is prevented.

JP, 2015-140854, A

  The seal structure using the gland packing of the valve reduces the sealing force due to stress relaxation of the gland packing, reduction of compressive stress due to loosening of the gland nut, wear of the gland packing due to shaft sliding, etc. Regular tightening (retightening) is essential.

  In addition, since the tendency of the sealing performance of the gland packing to fall is affected by the use conditions and the use environment, it is also necessary to determine the cycle of inspection and retightening of the gland nut.

  Performing inspections and retightenings one by one for many valves is labor-intensive and may result in maintenance leakage of inspections and retightenings.

  An object of the present invention is to provide a fluid controller that automatically tightens a gland packing provided inside a valve.

  According to the present invention (1), there are provided a valve body having a communication portion communicating an inlet flow path and an outlet flow path, a valve body disposed in the communication portion, a drive mechanism for moving the valve body, and the valve body. A shaft which penetrates and connects the drive mechanism and the valve body, a gland packing provided around the shaft and sealing between the shaft and the valve body, and screwed to the valve body A fluid controller comprising: a gland nut for pressing the gland packing; and a clamping device for automatically clamping the gland nut.

  Since the fluid controller has a clamping device that automatically retightens the gland packing, periodical tightening of the gland nut by a person is not necessary, and the check and retightening cycle of the gland nut tightening torque can be identified. Since it becomes unnecessary, the maintenance cost can be greatly reduced.

  Here, a clamping device that performs clamping automatically is a means (circuit) that issues a clamping instruction periodically or irregularly within the clamping device even if there is no instruction (input) from the outside or the like. And means for generating a clamping force.

  In the invention (2), the tightening device includes a motor, a motor gear provided on a motor shaft of the motor, and a ground nut gear engaged with the motor gear and provided to rotate integrally with the ground nut. And the fluid controller according to the invention (1).

  According to the present invention (2), the motor gear attached to the motor shaft can transmit the rotational force of the motor to the ground nut through the ground nut gear, and the rotational force transmitted to the ground nut allows the gland packing to be Pressing enables automatic tightening.

  The present invention (3) is the fluid controller according to the invention (1) or (2), further comprising a torque limiter that inhibits rotation of the ground nut when the torque applied to the ground nut exceeds a predetermined torque. It is a fluid controller provided.

  Since the fluid controller is provided with a torque limiter for stopping the rotation of the motor when it exceeds a predetermined torque, a predetermined pressing force can be automatically applied to the gland packing from the upper direction to the lower direction.

  The present invention (4) is the fluid controller according to the invention (3), wherein the tightening device has a control unit that sends a signal to rotate the motor at a predetermined timing.

  In order to prevent stress relaxation of the gland packing, reduction of compressive stress due to loosening of the gland nut, and reduction of sealing force due to wear of the gland packing due to shaft sliding, etc., it is essential to periodically tighten. It is difficult to define the cycle. As in the present invention (4), by sending a signal from the control device to the motor every predetermined time, it is difficult to determine the tightening cycle by rotating the ground nut and automatically retightening the gland packing. This makes it possible to automate valve maintenance.

  According to the fluid controller of the present invention, it is possible to provide a fluid controller that automatically tightens the gland packing provided inside the valve.

FIG. 1 shows a fluid controller of Example 1 in which a manual ball valve is fitted with a clamping device according to the present invention. FIG. 2 shows the ground nut gear attached to the motor gear and the manual ball valve of the tightening device of the first embodiment. FIG. 3 shows a fluid controller of Example 2 in which the clamping device according to the present invention is attached to a manual needle valve. FIG. 4 shows the ground nut gear attached to the motor gear and the manual needle valve of the tightening device of Example 2.

  Hereinafter, preferred embodiments of the present invention will be exemplarily described in detail with reference to the drawings. However, the materials, shapes, relative arrangements and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to the scope thereof unless stated otherwise in particular, and are merely illustrative examples. Absent. Further, for convenience, the directions of members and the like may be referred to as upper, lower, left, and right depending on the directions in the drawings, but these do not limit the scope of the present invention.

  FIG. 1 shows a fluid controller according to a first embodiment in which a clamping device 10 is attached to a manual ball valve 1A, and this valve 1A is called a floating ball valve.

  The ball-shaped valve body 3 is housed in the communication portion 24 of the valve body 2 and has a through hole 31, and the shaft body 4 is integrally formed at the top.

  The left and right valve seats 5, also called ball seats, are respectively fitted to the left and right retainers 6 of the valve body 3 and abut on the valve body 3. The valve seat 5 is biased by a spring 8 which is a disc spring. doing.

  The valve body 2 is sandwiched by the flanges 9 from the left and right, and the two flanges 9 on the left and right are fastened by the bolt 91 and the nut 92, and the fastening force allows the left and right springs 8 to be valve bodies 3 of the left and right flanges 9, respectively. The end face on the side is biased.

  An inlet channel 21 is formed in the inside of the flange 9 on the left side, and an outlet channel 22 is formed in the inside of the flange 9 on the right side. Each channel communicates with the through hole 31 when open. Do.

  The end of the left and right flanges 9 remote from the valve body 3 is provided with a threaded projection (not numbered) on the outer periphery for the pipe joint, and the cap nut 95 is screwed with this external thread. A front ring 93 and a buckling 94 are provided inside.

  A stem bearing 44 for smooth sliding with the valve body 2 is disposed at the lower part of the shaft 4 around the shaft, and a gland packing 40 for preventing fluid leakage is disposed at the upper part.

  A cylindrical protrusion 2A is formed on the upper portion of the valve body, a screw 2d is formed on the outer peripheral surface thereof, and a female screw 2b is formed on the inner surface.

  An annular projection 2e projecting in an annular form is formed on the lower inner peripheral surface of the projection 2A, and there is a stem bearing 44 below the annular projection 2e. There is a packing support 42 that holds the gland packing on the upper side.

  A gland packing 40 is disposed on the upper surface of the packing support 42, and the lower end face of the gland nut 50 directly presses the upper surface of the gland packing 40.

  The ground nut 50 has a cylindrical shape, and is screwed with a ground nut head 50a at the upper end and a lower outer peripheral surface of the ground nut head 50a so as to be able to be tightened with a spanner. The male thread portion 50b is formed.

  The shaft 4 passes through the cylindrical ground nut 50, and the shaft 4 is surrounded by the ground packing 40 disposed below the ground nut 50, the packing support 42 and the stem bearing 44.

  O-rings 51 are provided on the left and right end surfaces of the valve body 2 for preventing fluid leakage between the valve body 2 and the left and right flanges 9.

  A drive mechanism 7 called a handle for opening and closing the valve is provided on the top of the valve 1A, and a stop plate 71 in contact with the drive mechanism 7 is fixed by a nut 41.

  A ground nut gear 13 is provided so as to surround the ground nut head 50a, and a motor 14 having a motor shaft 11 to which a motor gear 12 meshing with the ground nut gear 13 is attached is attached to the mounting panel 15.

  The motor 14 is internally provided with a torque limiter for stopping the rotation of the motor when it exceeds a predetermined torque, and the motor 14 is connected to the control device 16 through the control line 18.

  The torque limiter can also be attached to the motor gear and the ground nut gear except inside the motor.

  The control device 16 has a function of sending a signal to the motor 14 every predetermined time to rotate the ground nut 50 in a direction to press the ground packing 40 downward from above.

  The lower end 15a of the mounting panel 15 is bent in an L-shape, and is fixed to the manual ball valve 1A by a panel nut 17 screwed with an external thread 2d formed on the outer peripheral surface of the projecting portion 2A. .

  FIG. 2 shows the ground nut gear attached to the motor gear and the manual ball valve of the tightening device of the first embodiment.

  The external shape of the ground nut head 50a at the upper end of the ground nut 50 through which the shaft 4 of the manual ball valve 1A passes is a regular hexagonal shape, and the ground nut is engaged with the ground nut head 50a. A regular hexagonal hole 13 b is bored in the gear 13.

  A tooth 13 a is formed on the outer periphery of the ground nut gear 13, and a motor gear 12 having a tooth 12 a meshing with the tooth 13 a is attached to the motor shaft 11 of the motor 14.

  FIG. 3 shows the fluid controller of the second embodiment in which the tightening device 10 is attached to the manual needle valve 1B, and the description of the same contents as those of the first embodiment will be partially omitted.

  The lower end portion of the valve body 3, which has a truncated conical shape tapered downward, is accommodated in the communication portion 24 of the valve body 2, and the upper portion is connected to the shaft 4.

  A communication portion 24 is formed between the inlet flow passage 21 and the outlet flow passage 22 formed in the valve body 2 at the upper and lower sides of the valve body 3, and abuts on the valve body 3 in the valve body 2 The valve seat 5 is formed.

  The shaft 4 is roughly divided into a shaft upper portion 4a connected to a drive mechanism 7 called a handle for moving the valve body 3 up and down from above, and a shaft shoulder 4b connected to the shaft upper portion 4a below it. The lower part of the shaft 4 has a shaft middle part 4c connected to the shaft shoulder 4b, and a shaft lower part 4d connected to the shaft middle part 4c and connected to the valve body 3. The lower shaft 4d is generally called a valve stem.

  A valve body upper surface recessed portion 2a is formed at the center of the upper surface of the valve body 2, and an internally threaded portion 2b is formed on the inner surface of the valve body upper surface recessed portion 2a, and has a ground nut external thread portion 50b screwed with the internally threaded portion 2b. The ground nut 50 protrudes above the valve body 2, and the ground nut 50 is fixed to the upper side of the valve body 2 by a ground nut fixing nut 49 screwed with the ground nut male screw portion 50b.

  The upper part of the grand nut 50 is formed with a hexagonal grand nut head 50a, and the grand nut head 50a is formed with a through hole (without reference numeral) through which the shaft upper part 4a passes.

  The ground nut 50 has a cylindrical portion (without a reference numeral) continuous with the ground nut head 50a below the ground nut head 50a, and a ground nut internal female thread 50d is formed on the inner surface of the cylindrical portion. .

  Below the shaft shoulder 4b connected to the lower end surface of the shaft upper portion 4a, a shaft middle portion 4c is formed, and this shaft middle portion 4c has an external thread (no reference numeral) on the outer peripheral surface, and this external thread is , And the internal thread 50d of the ground nut.

  A recess is formed in the lower end face of the middle shaft portion 4c, and the lower shaft head 4d1 formed at the upper end of the lower shaft portion 4d is fitted into this recess, and the operation of the drive mechanism 7 makes the middle shaft portion 4c The lower shaft portion 4d is moved up and down as it moves up and down while rotating.

  A lower shaft lower neck 4d2 which is continuous with the lower shaft lower head 4d1 and smaller in diameter than the lower shaft lower head 4d1 is formed downward, and a lower cylindrical lower body main body 4d3 is formed below the lower lower shaft neck 4d2 The lower end of the lower shaft body 4 d 3 is connected and fixed to the valve 3.

  A valve body lower recess 2c having an inner diameter smaller than the inner diameter of the valve body upper surface recess 2a is formed continuously with the lower surface of the valve body upper surface recess 2a, and the valve body lower recess 2c and the upper space of the communication portion 24 are connected. .

  The shaft lower main body 4d3 penetrates the space of the valve body upper surface concave portion 2a, the space of the valve body lower concave portion 2c and the space above the communication portion 24, and the packing support 42 is disposed at the bottom of the valve body lower concave portion 2c. And a gland packing 40 for preventing fluid leakage from the periphery of the shaft 4 is disposed thereon.

  A packing presser 43 having a through hole through which the shaft lower main body 4d3 penetrates at the central portion is disposed in contact with the upper surface of the gland packing 40.

  The outer diameter of the upper part of the packing presser 43 is slightly smaller than the inner diameter of the valve body upper surface recessed part 2a, and the outer diameter of the lower part of the packing presser 43 is slightly smaller than the inner diameter of the valve body lower recessed part 2c. Is pressed at the lower end surface of the ground nut 50 at the outer peripheral portion of the upper surface of the packing holder 43.

  A ground nut gear 13 is provided so as to surround the ground nut head 50a, and a motor 14 having a motor shaft 11 to which a motor gear 12 meshing with the ground nut gear 13 is attached is attached to the mounting panel 15.

  The motor 14 is internally provided with a torque limiter for stopping the rotation of the motor when it exceeds a predetermined torque, and the motor 14 is connected to the control device 16 through the control line 18.

  The control device 16 has a function of sending a signal to the motor 14 every predetermined time to rotate the ground nut 50 in a direction to press the ground packing 40 downward from above.

  The lower end portion 15a of the mounting panel 15 is bent in an L-shape, and a manual nut valve fixing screw 49 is screwed with a ground nut external thread portion 50b formed on the outer peripheral surface of the ground nut 50. It is fixed to

  FIG. 4 shows the ground nut gear attached to the motor gear and the manual needle valve of the tightening device of Example 2.

  The external shape of the ground nut head 50a at the upper end of the ground nut 50 through which the shaft 4 of the manual needle valve 1B passes is a regular hexagonal shape, and the ground nut is engaged with the ground nut head 50a. A regular hexagonal hole 13 b is bored in the gear 13.

  A tooth 13 a is formed on the outer periphery of the ground nut gear 13, and a motor gear 12 having a tooth 12 a meshing with the tooth 13 a is attached to the motor shaft 11 of the motor 14.

1A, 1B; valve 2; valve body 2b; female thread portion 3; valve body 4; shaft body 5; valve seat 7;
10: tightening device 11; motor shaft 12; motor gear 13; ground nut gear 14; motor 16; control device 40; ground packing 50;

Claims (4)

A valve body having a communication portion communicating the inlet flow path and the outlet flow path;
A valve body disposed in the communication portion;
A drive mechanism for moving the valve body;
A shaft body which penetrates the valve body and connects the drive mechanism and the valve body;
A gland packing provided around the shaft and sealing between the shaft and the valve body;
A gland nut screwed to the valve body and pressing the gland packing;
A clamping device for automatically clamping the gland nut;
A fluid controller.   The clamping device includes a motor, a motor gear provided on a motor shaft of the motor, and a ground nut gear engaged with the motor gear and provided to rotate integrally with the ground nut. The fluid controller as described.   The fluid controller according to claim 1 or 2, further comprising a torque limiter that inhibits rotation of the ground nut if torque applied to the ground nut exceeds a predetermined torque. The fluid controller according to claim 3, wherein the clamping device has a control unit that sends a signal to rotate the motor at a predetermined timing.

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