JP2019065970A - Fluid controller - Google Patents

Abstract

To provide a fluid controller capable of automatically refastening a gland packing provided in a valve.SOLUTION: A fluid controller comprises: a valve body 2; a valve element 3 disposed in a communication part 24; a drive mechanism 7; a shaft body 4 connecting the drive mechanism 7 and the valve element 3; a gland packing 40 provided around the shaft body 4 and 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; a sensor 100 provided between the gland nut 50 and the gland packing 40; and a fastening device comprising a fastening part configured to fasten the gland nut 50, a reception part 81 configured to receive a signal from the sensor 100, a determination part 83 configured to determine whether to perform fastening using the signal received by the reception part 81, and an instruction part 84 configured to instruct the fastening part to perform fastening according to the determination at the determination part 83.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fluid controller having a gland packing.

  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 invention described in Patent Document 1 is a manual ball valve, and the adhesion between the gland packing and the stem and the valve body is ensured by managing the tightening torque of the nut.

  In the gland packing seal structure of the valve, side stress is applied to the side face of the gland packing by applying a compressive stress to the gland packing of the resin material, thereby sealing the fluid. Therefore, the sealing force is reduced 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. Therefore, regular tightening of the gland nut is indispensable. .

  In addition, since the tendency of the seal strength 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 tightening torque.

  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 ground nut for pressing the gland packing, a sensor provided between the gland nut and the gland packing, a clamping unit for clamping the gland nut, and a receiver for receiving a signal from the sensor A determination unit that determines whether to perform tightening using the signal received by the reception unit, and an instruction unit that instructs the tightening unit to tighten according to the determination of the determination unit Clamping the device comprises a fluid controller having.

  A sensor provided between the gland nut and the gland packing can always monitor how much pressing force or the like is applied to the gland packing.

  Since a control device is provided that instructs the clamping device to retighten in response to a signal from this sensor, periodic tightening of the ground nut by a person is not necessary. Furthermore, since it becomes unnecessary to determine the check and retightening cycles of the ground nut tightening torque, the maintenance cost can be greatly reduced.

  In the invention (2), the tightening portion 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).

  The tightening portion rotates the motor to retighten, the motor shaft is provided with the motor gear, the ground nut is provided with the ground nut gear, and the teeth of these two gears are engaged, so the rotational force of the motor Can be reliably transmitted to the ground nut.

  Further, since the control device is provided with a receiving unit for receiving a signal from the sensor, it is possible to monitor what kind of pressing force and the like the gland packing receives, and the received signal from the sensor is The determination unit can always determine whether or not it is within the predetermined range. Then, the gland packing can be automatically tightened based on the determination result.

  The invention (3) is the fluid controller according to the invention (1) or (2), wherein the sensor is a pressure sensor or a strain gauge.

  According to the invention (3), since the sensor is a pressure sensor or a strain gauge, the signal from the sensor is information on how much pressure the gland packing receives or how much strain is generated in the gland packing The controller that has received the can be obtained.

  According to the fluid controller of the present invention, it is possible to provide a fluid controller that automatically tightens the gland packing based on a signal from a sensor 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. FIG. 5 shows a fluid control system controlling a plurality of valves with clamping devices.

  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 top surface of the packing support 42, and the sensor 100 is provided on the top surface of the gland packing 40, and the lower end face of the gland nut 50 directly presses the sensor 100.

  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 signal from the sensor 100 is received by the receiving antenna 82 of the receiving unit 81 provided in the control device 16, and the received signal is sent from the receiving unit 81 to the determining unit 83, and the magnitude of the signal is predetermined. A determination is made as to whether retightening is to be performed in comparison with a predetermined range of values.

  The result determined by the determination unit 83 is sent to the instruction unit 84. When retightening is performed, a signal of the instruction to the motor is sent to the motor 14 through the control line 18, and the motor 14 is rotated.

  The motor 14 is preferably a stepping motor, and a pulse corresponding to the angle at which the motor shaft 11 is to be rotated is sent from the instruction unit 84 to the motor 14.

  A torque limiter may be provided in the motor 14 to prevent excessive rotation of the motor 14, and the torque limiter may be provided in the motor gear 12 or the ground nut gear 13.

  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 Example 2 in which the clamping device 10 is attached to the manual needle valve 1B.

  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 presses the sensor 100 disposed on 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 signal from the sensor 100 is received by the receiving antenna 82 of the receiving unit 81 provided in the control device 16, and the received signal is sent from the receiving unit 81 to the determining unit 83, and the magnitude of the signal is predetermined. A determination is made as to whether retightening is to be performed in comparison with a predetermined range of values.

  The result determined by the determination unit 83 is sent to the instruction unit 84. When retightening is performed, a signal for instructing the motor 14 is sent to the motor 14 through the control line 18, and the motor 14 is rotated.

  The motor 14 is preferably a stepping motor, and a pulse corresponding to the angle at which the motor 14 is to be rotated is sent from the instruction unit 84 to the motor 14.

  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.

  FIG. 5 shows a fluid control system in a facility, plant or the like provided with N valves 1A to which the clamping device 10 is attached.

  An electronic tag 86 in which information about the valve is recorded is attached to the valve with a clamping device, and a signal is sent from the electronic tag 86 of the valve with the rightmost clamping device to the receiving antenna 102 of the server 101. In association with this signal, the signal from the sensor 100 of the clamping valve is also sent to the receiving antenna 102 of the server 101.

  These signals are sent from the receiving unit 103 to the determining unit 104, and the determining unit 104 compares the value of the predetermined range with the magnitude of the received signal to determine whether retightening of the ground packing 40 is to be performed. Is done.

  The result determined by the determination unit 104 is sent to the instruction unit 105, and when retightening is performed, an instruction signal is sent from the transmitting antenna 106 connected to the instruction unit 105 to the reception antenna 85 of the valve 1A-1. The signal is sent to the motor 14 through the control line 18, the motor 14 is rotated by a predetermined angle, and retightening of the gland packing 40 is performed automatically.

1A, 1B; valve 2; valve body 2b; female thread portion 3; valve body 4; shaft body 5; valve seat 7;
10: Clamping device 11; Motor shaft 12; Motor gear 13; Ground nut gear 14; Motor 16; Control device 40; Ground packing 50; Ground nut 81;
83; Judgment unit (control device)
84; indication unit (control device)
85; receiving antenna 86; electronic tag 100; sensor 101; server 103; receiving unit (server)
104; Judgment unit (server)
105; indication unit (server)

Claims (3)

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 sensor provided between the gland nut and the gland packing;
A tightening unit that tightens the ground nut, a receiving unit that receives a signal from the sensor, a determining unit that determines whether to perform tightening using the signal received by the receiving unit, a determination by the determining unit A tightening device including an instruction unit that instructs the tightening unit to tighten in accordance with
A fluid controller. The tightening portion 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 according to claim 1, comprising: The fluid controller according to claim 1, wherein the sensor is a pressure sensor or a strain gauge.

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