WO2021143221A1

WO2021143221A1 - Metal-sealed unfurled valve and driving device therefor

Info

Publication number: WO2021143221A1
Application number: PCT/CN2020/120810
Authority: WO
Inventors: 王忠渊; 苏荆攀; 南飞; 吴怀敏; 薛红权; 杨隆杰; 项力胜; 章苗苗; 黄家巧
Original assignee: 浙江石化阀门有限公司
Priority date: 2020-01-14
Filing date: 2020-10-14
Publication date: 2021-07-22
Also published as: JP7168793B2; CN111237532B; CN111237532A; JP2022531824A

Abstract

Disclosed are a metal-sealed unfurled valve and a driving device therefor, relating to the field of valves. The valve comprises a valve rod (1), a linear stroke driving mechanism (2), a rotation driving mechanism (3) and a double-motion switch mechanism (4), wherein a movable end of the linear stroke driving mechanism (2) is mounted on the valve rod (1) in a sleeving manner and drives the valve rod to linearly move up and down; a movable end of the rotation driving mechanism (3) is mounted on the valve rod (1) in a sleeving manner and drives the valve rod to rotate forwards and reversely; and the linear motion stroke and the forward and reverse rotation angles of the valve rod (1) are all controlled by the double-motion switch mechanism (4). The valve has a good working stability and a high degree of automation.

Description

An open type metal sealing valve and its driving device

Technical field

The invention relates to the field of valves, in particular to an open metal sealed valve and a driving device thereof.

Background technique

The open metal seal valve is a combination of gate valve and ball valve structure and action principle. Its valve core is composed of three pieces, with a wedge cone in the middle, and two valve plates connected by T-shaped grooves on both sides, which is called a combined valve core. The wedge cone and the valve stem are connected as a whole through the thread and the horizontal pin, and can move up and down and rotate with the valve stem. The wedge cone and the valve plate are connected by a 5-degree inclined guide rail of the wedge cone. They can be folded as the wedge cone rises, and open to both sides as the wedge cone descends, sticking to the valve seat The sealing surface. Due to the restriction of the upper and lower limit rings, the valve plate cannot rise or fall with the wedge cone, and can only move in a plane perpendicular to the valve stem to expand or contract and rotate with the wedge cone. When the valve plate is closed, the sealing surface of the valve plate is separated from the sealing surface of the valve seat. When the valve core assembly is lifted and rotated, there is no friction between the sealing pairs, which saves effort to open and has a long service life of the valve. When the valve core assembly rotates 90 degrees, the through hole in the middle of the wedge cone is aligned with the flow passage hole of the valve body, and the valve is in an open state. When the valve stem rotates 90 degrees in the reverse direction, the valve plate is in the closed position, and the wedge cone moves down with the valve stem, so that the valve plate is opened to both sides and sticks to the sealing surface of the valve seat to realize the valve closing. In the prior art, there is no driving device that simultaneously controls the lifting and rotating of the valve stem by 90 degrees, and the operation is very inconvenient.

Technical solutions

In order to overcome the shortcomings of the background technology, the present invention provides a drive device for an open metal sealed valve with good working stability and high degree of automation.

The technical scheme adopted by the present invention: a drive device for an open metal seal valve, comprising a valve stem, a straight-stroke drive mechanism, a rotary drive mechanism, and a double-action switch mechanism. The movable end of the straight-stroke drive mechanism is sleeved in the On the valve stem and drive it to move up and down linearly, the movable end of the rotary drive mechanism is sleeved on the valve stem and drives its forward and reverse rotation, the linear motion stroke and the forward and reverse rotation angle of the valve stem are all determined by the Double action switch mechanism control.

The linear drive mechanism includes an upper cylinder block, an upper cylinder seat, an upper cylinder head and a piston. The upper cylinder head and the upper cylinder seat are both sleeved on the valve rod and each has a first inlet and outlet hole. The upper and lower ends of the upper cylinder are respectively connected to the outer circumference of the upper cylinder head and the upper cylinder seat to form a cavity. The inner ring of the piston is mounted on the valve rod and the outer ring is connected to the inner wall of the upper cylinder. Seal sliding fit.

The valve rod is provided with a bearing seat at a position corresponding to the piston, a bearing is provided between the bearing seat and the inner ring of the piston, and a lock nut that abuts the upper surface of the bearing is also provided on the bearing seat.

The rotation driving mechanism includes a lower cylinder block, a lower cylinder block, a connecting sleeve, and a rotating assembly mounted on the connecting sleeve. The upper and lower ends of the lower cylinder block are respectively sealed to the outer circumferences of the upper cylinder block and the lower cylinder block. And a cavity is formed, the connecting sleeve is sleeved on the valve stem and the two are connected in linkage, the rotating assembly includes several pairs of fixed plates and rotating plates, the fixed plates and the rotating plates are respectively vertical and along the diameter The directional seal is installed between the connecting sleeve and the lower cylinder. One end of the rotating plate is fixedly connected to the connecting sleeve and the other end is in a sealing sliding fit with the inner wall of the lower cylinder. The fixed plate and the lower cylinder The body is provided with a through second inlet and outlet hole, and a pressure chamber with a variable size is formed between the fixed plate and the rotating plate.

The second inlet and outlet holes are composed of two screw holes one on the lower cylinder body and two screw holes two on the fixing plate. The two screw holes are arranged vertically and correspond to the two screw holes one-to-one. The two sides of the fixing plate are respectively provided with through holes communicating with the two screw holes.

The inner hole of the connecting sleeve is provided with a plurality of vertically arranged guide grooves that penetrate up and down, and the valve stem is provided with a plurality of guide keys that are slidingly matched with the guide grooves;

Adjustment screws are arranged on the left and right sides of the fixing plate.

The outer surface of the lower cylinder is wrapped with a compression ring, the inner wall of the compression ring is provided with two horizontally arranged vent ring grooves, and a rubber sealing plate is provided between the vent ring groove and the outer surface of the lower cylinder , The mouth end of the vent ring groove is provided with an annular installation groove for the installation of the rubber sealing plate, the rubber sealing plate is provided with a through hole corresponding to the screw hole, and the compression ring is provided with the vent ring groove Fittings.

The double-action switch mechanism includes:

A positioning plate, which is fixedly installed at the top end of the valve stem, and is provided with positioning bars extending outwardly in the circumferential direction;

Lifting switch seat, which is vertically fixedly installed on the upper surface of the upper cylinder head;

A pair of rotary switch seats, which are fixedly installed on the upper surface of the upper cylinder head;

The vertical direction of the lift switch seat is provided with a proximity switch 1 which is arranged oppositely and has an appropriate spacing. The positioning plate is located between the two proximity switches 1 and each rotary switch seat is provided with a proximity switch 2 so The rotation range of the positioning bar is between the two proximity switches.

A bracket for installation is provided under the lower cylinder seat, and the bracket, the lower cylinder seat and the upper cylinder head are fixedly connected by a tie rod and a nut.

A support type metal seal valve, comprising a valve cover, a combined valve core, a valve seat and a valve body. The valve cover is also equipped with the above-mentioned driving device. The combined valve core consists of a wedge-shaped cone and two The side valve plate is composed of the wedge-shaped cone and the valve plate connected as a whole through a thread and a horizontal pin, and can move up and down and rotate with the valve stem.

Beneficial effect

The beneficial effects of the present invention are:

1. This technical solution controls the up and down movement of the valve stem through the linear drive mechanism, and then controls the valve stem to rotate forward and reverse around the axis through the rotary drive mechanism. The double action switch mechanism controls the opening and closing of the linear drive mechanism and the rotary drive mechanism. Closed, simple operation, high control precision;

2. In this technical scheme, the linear drive mechanism selects one of the upper and lower cavities of the piston to pressurize, so as to realize the upward or downward movement of the piston. The piston drives the valve stem to move up and down synchronously. The structure is simple and the work is stable. it is good;

3. The rotary drive mechanism in this technical solution pressurizes the fixed plate and the second inlet and outlet of the cylinder. As the pressure changes in the chamber between the rotary plate and the fixed plate, the rotary plate approaches or moves away from the fixed plate. At the same time, the valve stem is driven to rotate through the connecting sleeve, with high rotation accuracy and good working stability.

Description of the drawings

Fig. 1 is a schematic diagram of the structure of an open metal seal valve according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view at A-A in Fig. 1.

Fig. 3 is a schematic cross-sectional view at B-B in Fig. 1.

Fig. 4 is a schematic diagram of direction A in Fig. 1.

Embodiments of the present invention

The embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

As shown in the figure, a drive device for an open metal seal valve includes a valve stem 1, a straight-stroke drive mechanism 2, a rotary drive mechanism 3, and a double-action switch mechanism 4. The movable end of the straight-stroke drive mechanism 2 is set On the valve stem 1 and drive it to move up and down linearly, the movable end of the rotary drive mechanism 3 is sleeved on the valve stem 1 and drives the forward and reverse rotations, the linear movement stroke and the forward and reverse of the valve stem 1 The rotation angles are all controlled by the double-action switch mechanism 4. The present technical solution controls the up and down movement of the valve stem through a straight-stroke drive mechanism, and then controls the valve stem to rotate forward and backward around the axis through a rotary drive mechanism, which is controlled by the double-action switch mechanism The opening and closing of the linear drive mechanism and the rotary drive mechanism are simple in operation and high in control accuracy. The linear drive mechanism 2 in this embodiment and the rotary drive mechanism adopt a pneumatic structure. The following content introduces the technical solution using the pneumatic structure.

The linear drive mechanism 2 includes an upper cylinder body 21, an upper cylinder seat 22, an upper cylinder head 23, and a piston 24. The upper cylinder head 23 and the upper cylinder seat 22 are both sleeved on the valve rod 1 and are both attached respectively. There is a first inlet and outlet hole 25. The upper and lower ends of the upper cylinder body 21 are respectively connected to the outer circumference of the upper cylinder head 23 and the upper cylinder seat 22 in a sealed manner to form a cavity. The inner ring of the piston 24 is mounted on the valve On the rod 1 and the outer ring of the upper cylinder 21 is in a sealing sliding fit with the inner wall of the upper cylinder body 21, the linear drive mechanism in this technical solution selects one of the two cavities above and below the piston to pressurize, so as to realize the rising or falling of the piston When the piston moves, the valve rod is driven to move up and down synchronously. The structure is simple and the work stability is good. The piston is sleeved on the valve rod and drives it to rotate up and down, but the two can rotate relative to each other.

The valve stem 1 is provided with a bearing seat 26 at a position corresponding to the piston 24. A bearing 27 is provided between the bearing seat 26 and the inner ring of the piston 24. The bearing seat 26 is also provided with a lock against the upper surface of the bearing 27. Tighten the nut 28 to prevent the piston from rotating when the valve stem rotates and increase friction. An anti-loosening washer is installed between the two lock nuts. The bearing in this embodiment adopts a flat roller bearing.

The rotation driving mechanism 3 includes a lower cylinder block 31, a lower cylinder block 32, a connecting sleeve 33 and a rotating assembly mounted on the connecting sleeve 33. The upper and lower ends of the lower cylinder block 32 are connected to the upper cylinder block 22 and the lower cylinder block respectively. The outer circumference of the cylinder seat 31 is hermetically connected and forms a cavity. The connecting sleeve 33 is sleeved on the valve stem 1 and the two are connected in linkage. The rotating assembly includes several pairs of fixed plates 34 and rotating plates 35. The fixed plate 34 and the rotating plate 35 are respectively installed vertically and radially and sealed between the connecting sleeve 33 and the lower cylinder 32. One end of the rotating plate 35 is fixedly connected to the connecting sleeve 33 and the other end is connected to the connecting sleeve 33. The inner wall of the lower cylinder body 32 is sealed and slip-fitted, the fixed plate 34 and the lower cylinder body 32 are provided with a through second inlet and outlet hole 36, and a variable pressure is formed between the fixed plate 34 and the rotating plate 35 Cavity, the rotary drive mechanism in this technical solution pressurizes the fixed plate and the second inlet and outlet in the cylinder. As the pressure changes in the cavity between the rotating plate and the fixed plate, the rotating plate approaches or moves away from the fixed plate. At the same time, the valve stem is driven to rotate through the connecting sleeve, with high rotation accuracy and good working stability.

In addition, there are three groups of the fixed plate and the rotating plate in this embodiment, which are equally distributed and arranged in the circumferential direction of the valve stem.

The second inlet and outlet holes 36 are composed of two screw holes 361 on the lower cylinder 32 and two screw holes 362 on the fixing plate 34. The two screw holes 361 are arranged vertically and are connected to the two screw holes. 362 corresponds to each other. The two sides of the fixing plate 34 are respectively provided with through holes 341 communicating with the two screw holes 362. There are two sets of second inlet and outlet holes, one set as the air inlet and the other as the air outlet, as shown in the figure As shown in 2, the rotating plate on one side of the first fixed plate is far away from the first fixed plate and close to the second fixed plate by air intake, and the gas between the rotating plate and the second fixed plate is fixed from the second one. Exhaust from the board. To

The inner hole of the connecting sleeve 33 is provided with a plurality of vertical guide grooves 331 which penetrate up and down, and the valve stem 1 is provided with a plurality of guide keys 332 slidingly matched with the guide grooves 331, and the guide grooves penetrate up and down, The valve stem can freely move up and down in the connecting sleeve, but it is restricted by the connecting sleeve when it rotates, and the two rotate in conjunction;

The fixing plate 34 is provided with adjusting screws 342 on the left and right sides, and the rotation range of the rotating plate is controlled by screwing the installation depth of the adjusting screws, thereby adjusting the rotation angle of the valve stem.

The outer surface of the lower cylinder body 32 is wrapped with a compression ring 37, and the inner wall of the compression ring 37 is provided with two horizontally arranged vent ring grooves 371. The vent ring grooves 371 and the outer surface of the lower cylinder body 32 are different from each other. A rubber sealing plate 38 is provided in between. The mouth end of the vent ring groove 371 is provided with a ring-shaped mounting groove 372 for the rubber sealing plate 38 to be installed. The rubber sealing plate 38 is provided with a through hole 381 corresponding to the screw hole 361 The compression ring 37 is provided with a pipe joint 373 communicating with the vent ring groove 371. The purpose of this design is to allow one inlet pipe joint to enter air, and three inflatable fixing plates simultaneously inflate into the three pressure chambers.

The double-action switch mechanism 4 includes:

The positioning plate 41 is fixedly installed on the top end of the valve stem 1, and is provided with a positioning strip 42 extending outward in the circumferential direction;

The lift switch seat 43 is fixedly installed on the upper surface of the upper cylinder head 23 in a vertical direction;

A pair of rotary switch seats 44, which are fixedly installed on the upper surface of the upper cylinder head 23;

The lift switch base 43 is vertically provided with a proximity switch 431 that is arranged oppositely and has an appropriate spacing. The positioning plate 41 is located between the two proximity switches 431. Each rotary switch base 44 is provided with one proximity switch 431. Proximity switch two 441, the rotation range of the positioning bar 42 is between two proximity switches 441;

When the valve stem rises or falls, the positioning disc is within the range of the two proximity switches one, and when it is close to the proximity switch, it will send a signal to the control device, and the control device then controls the inflator to inflate into each pressure chamber;

When the valve stem rotates forward and reverse, the rotation range of the positioning bar is between the two proximity switches. The working principle is the same as that of the proximity switch 1, and a signal will also be sent to the control device.

A bracket 5 for installation is provided under the lower cylinder base 31, and the bracket 5, the lower cylinder base 31 and the upper cylinder head 23 are fixedly connected by tie rods and nuts.

A stretched metal seal valve, comprising a valve cover 6, a combined valve core 9, a valve seat 7 and a valve body 8. The valve cover 6 is also equipped with the above-mentioned driving device, and the combined valve core 9 is formed by the middle The wedge cone 91 and the valve plates 92 on both sides are formed, the wedge cone 91 and the valve plate 92 are connected by a T-shaped groove, and the wedge cone 91 and the valve stem 1 are connected as a whole by a thread and a horizontal pin. , Can move up and down with the valve stem 1, and the valve in this technical solution has all the above technical effects.

In the description of the present invention, it should be noted that the terms "center", "vertical", "horizontal", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing and simplifying the present invention. The description does not indicate or imply that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense unless otherwise clearly specified and limited. For example, they can be fixed or detachable. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood under specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

Technical personnel notice: Although the present invention has been described in accordance with the above specific embodiments, the inventive idea of the present invention is not limited to this invention. Any modification using the inventive idea will be included in the protection scope of this patent.

Claims

A drive device for an open metal seal valve, which is characterized in that it comprises a valve stem (1), a straight-stroke drive mechanism (2), a rotary drive mechanism (3) and a double-action switch mechanism (4). The movable end of the drive mechanism (2) is sleeved on the valve stem (1) and drives it to move up and down linearly, and the movable end of the rotary drive mechanism (3) is sleeved on the valve stem (1) and drives the valve stem (1). In the reverse direction, the linear motion stroke and the forward and reverse rotation angle of the valve stem (1) are controlled by the double-action switch mechanism (4).
The drive device of the open metal seal valve according to claim 1, characterized in that: the straight-stroke drive mechanism (2) comprises an upper cylinder block (21), an upper cylinder seat (22), and an upper cylinder head (23). ) And the piston (24), the upper cylinder head (23) and the upper cylinder seat (22) are all sleeved on the valve stem (1) and each has a first inlet and outlet hole (25), the upper cylinder The upper and lower ends of the body (21) are respectively connected with the outer circumference of the upper cylinder head (23) and the upper cylinder seat (22) to form a cavity. The inner ring of the piston (24) is installed on the valve stem (1). ) And its outer ring is in a sealing sliding fit with the inner wall of the upper cylinder (21).
The drive device of the open metal seal valve according to claim 2, characterized in that: the valve stem (1) is provided with a bearing seat (26) at a position corresponding to the piston (24), and the bearing seat (26) A bearing (27) is provided between the inner ring of the piston (24) and the bearing seat (26), and a lock nut (28) that abuts the upper surface of the bearing (27) is also provided on the bearing seat (26).
The drive device of the open metal seal valve according to claim 2, characterized in that: the rotary drive mechanism (3) comprises a lower cylinder seat (31), a lower cylinder body (32), a connecting sleeve (33) and The rotating assembly installed on the connecting sleeve (33), the upper and lower ends of the lower cylinder body (32) are respectively sealedly connected to the outer circumference of the upper cylinder seat (22) and the lower cylinder seat (31) and form a cavity , The connecting sleeve (33) is sleeved on the valve stem (1) and the two are connected in linkage, the rotating assembly includes several pairs of fixed plates (34) and a rotating plate (35), the fixed plate (34) The rotating plate (35) and the rotating plate (35) are respectively vertically and radially sealed and installed between the connecting sleeve (33) and the lower cylinder (32). One end of the rotating plate (35) is connected to the connecting sleeve (33). ) Is fixedly connected and the other end is in a sealing sliding fit with the inner wall of the lower cylinder (32), the fixing plate (34) and the lower cylinder (32) are provided with a through second inlet and outlet hole (36), the fixed A pressure chamber of variable size is formed between the plate (34) and the rotating plate (35).
The drive device of the open metal seal valve according to claim 4, characterized in that: the second inlet and outlet holes (36) are formed by two screw holes (361) on the lower cylinder (32) and a fixed plate (34) is composed of two screw holes (362). The two screw holes (361) are arranged vertically and correspond to the two screw holes (362) one to one. The two sides of the fixing plate (34) A through hole (341) communicating with the second screw hole (362) is respectively provided.
The drive device of the open metal seal valve according to claim 4, characterized in that: the inner hole of the connecting sleeve (33) is provided with a plurality of vertically arranged guide grooves (331) which penetrate up and down, and the valve stem (1) There are a number of guide keys (332) that cooperate with the sliding of the guide groove (331);

The fixing plate (34) is provided with adjusting screws (342) on the left and right sides.
The drive device of the open metal seal valve according to claim 5, characterized in that: the outer surface of the lower cylinder (32) is wrapped with a compression ring (37), and the compression ring (37) Two horizontally arranged vent ring grooves (371) are provided on the inner wall. A rubber sealing plate (38) is provided between the vent ring groove (371) and the outer surface of the lower cylinder (32). ) Is provided with a ring-shaped mounting groove (372) for the installation of the rubber sealing plate (38), the rubber sealing plate (38) is provided with a through hole (381) corresponding to the screw hole one (361), the The compression ring (37) is provided with a pipe joint (373) communicating with the vent ring groove (371).
The drive device of the open metal seal valve according to claim 2, characterized in that: the double-action switch mechanism (4) comprises:

A positioning plate (41), which is fixedly installed on the top end of the valve stem (1), and is provided with a positioning strip (42) extending outward in the circumferential direction;

A lift switch seat (43), which is vertically fixedly installed on the upper surface of the upper cylinder head (23);

A pair of rotary switch seats (44), which are fixedly installed on the upper surface of the upper cylinder head (23);

The vertical direction of the lift switch base (43) is provided with a proximity switch (431) which is arranged oppositely and has an appropriate spacing. The positioning disc (41) is located between two proximity switches (431), each rotating A second proximity switch (441) is provided on the switch base (44), and the rotation range of the positioning bar (42) is between the two proximity switches (441).
The drive device of the open metal seal valve according to claim 4, characterized in that: a bracket (5) for installation is provided under the lower cylinder seat (31), and the bracket (5), the lower cylinder The seat (31) and the upper cylinder head (23) are fixedly connected by tie rods and nuts.
An open type metal sealing valve, comprising a valve cover (6), a combined valve core (9), a valve seat (7) and a valve body (8), characterized in that: the valve cover (6) is also installed with The driving device according to any one of claims 1-9, the combined valve core (9) is composed of a wedge cone (91) in the middle and valve plates (92) on both sides, and the wedge cone ( 91) and the valve plate (92) are slidingly connected by a T-shaped groove, the wedge cone (91) and the valve stem (1) are connected as a whole through a thread and a horizontal pin, and can be lifted and rotated with the valve stem (1) sports.