JP7168793B2 - EXPANDABLE METAL SEAL VALVE AND ITS DRIVING DEVICE - Google Patents

Description

TECHNICAL FIELD The present invention relates to the field of valves, and more particularly to an expandable metal seal valve and its drive.

The expandable metal seal valve is a combination of gate valve and ball valve structure and working principle, its valve core is combined by three parts, the middle is wedge cone, and two valve plates through T-shaped groove on both sides. connected to and called a combination valve core. The wedge cone and valve stem are integrally connected via a screw and a lateral pin and can move up and down and rotate along with the valve stem. The wedge cone and the valve plate are connected through a guide rail with a 5-degree slope on the wedge cone, which converges as the wedge cone rises, expands to both sides as the wedge cone descends, and abuts against the valve base sealing surface. be able to. Due to the restrictions of the upper limit ring and the lower limit ring, the valve plate cannot move up or down with the wedge cone, but can expand or contract in a plane perpendicular to the valve stem and rotate with the wedge cone. I can only do it. When the valve plate contracts, the valve plate sealing surface and the valve base sealing surface separate, and when the valve core assembly rises and rotates, there is no friction between the seal pairs, which saves opening effort and prolongs the service life of the valve. . When the valve core assembly is rotated 90 degrees, the through hole in the middle of the wedge cone and the passage hole in the valve block are aligned and the valve is in an open state. The valve stem is reversely rotated 90 degrees, the valve plate is in the closed position, the wedge cone moves down with the valve stem, expands the valve plate to both sides, and presses against the sealing surface of the valve base, and the valve is closed. achieve closure. In the prior art, there is no driving device for simultaneously controlling the up-and-down and 90-degree rotation of the valve stem, which makes the operation very inconvenient.

To overcome the deficiencies of the background art, the present invention provides a driving device for an expandable metal seal valve with excellent operational stability and a high degree of automation.

The technical solution adopted by the present invention is as follows: a drive device for an expandable 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 fitted to the valve stem and drives its vertical linear motion, and the movable end of the rotary drive mechanism is fitted to the valve stem and drives its forward and reverse rotation. The straight stroke and forward and reverse rotation angles of the valve stem are all controlled by the double action switch mechanism.

The straight stroke drive mechanism includes an upper cylinder block, an upper cylinder seat, an upper cylinder head, and a piston, wherein the upper cylinder head and the upper cylinder seat are both fitted to the valve stem and each is a first valve. the upper and lower ends of the upper cylinder block are respectively connected to the outer circumferences of the upper cylinder head and the upper cylinder seat by seals to form a cavity; the inner ring of the piston is attached to the valve stem; The outer ring is slidably engaged with the inner wall of the upper cylinder block with a seal.

A bearing seat is provided at a position corresponding to the piston of the valve stem, a bearing is provided between the bearing seat and the inner ring of the piston, and a lock nut is further provided on the bearing seat to abut on the upper surface of the bearing.

The rotary drive mechanism includes a lower cylinder seat, a lower cylinder block, a connecting sleeve, and a rotating component mounted on the connecting sleeve, wherein the upper and lower ends of the lower cylinder block are respectively on the outer peripheries of the upper cylinder seat and the lower cylinder seat. connected by a seal to form a cavity, the connecting sleeve is fitted to the valve stem and the two are interlockingly connected, the rotary component comprises a plurality of pairs of fixed plates and rotary plates, the fixed plates and a rotating plate are respectively mounted vertically and radially between the connecting sleeve and the lower cylinder block with a seal, one end of the rotating plate is fixedly connected to the connecting sleeve and the other end of the lower cylinder. A second access hole is provided through the stationary plate and the lower cylinder block in sliding engagement with the inner wall of the block with a seal to form a variable size pressure chamber between the stationary plate and the rotating plate. .

The second access holes are composed of two first screw holes in the lower cylinder block and two second screw holes in the fixing plate, the two first screw holes being longitudinally arranged and the two second screw holes Through-holes communicating with the second screw holes are provided on both side surfaces of the fixing plate in one-to-one correspondence with the two screw holes.

a plurality of guide grooves extending vertically through the inner hole of the connecting sleeve, and a plurality of guide keys slidingly engaged with the guide grooves provided on the valve stem;
Adjustment screws are provided on both left and right sides of the fixing plate.

The outer surface of the lower cylinder block is coated with a pressing ring, the inner wall of the pressing ring is provided with two horizontal ventilation ring grooves, and a rubber seal plate is provided between the ventilation ring groove and the outer surface of the lower cylinder block. a ring-shaped mounting groove for mounting a rubber seal plate is provided at the mouth end of the ventilation ring groove; the rubber seal plate is provided with a through hole corresponding to the first screw hole; A pipe joint is provided that communicates with the ring groove.

The double action switch mechanism is
a positioning board fixedly attached to the tip of the valve stem and provided with a positioning bar extending outward in the circumferential direction;
an elevation switch sheet vertically fixedly attached to the upper surface of the upper cylinder head;
a pair of rotary switch seats fixedly attached to the upper surface of said upper cylinder head;
A first proximity switch is provided on the lift switch sheet so as to face each other in the longitudinal direction and has an appropriate spacing, the positioning board is located between the two first proximity switches, and each rotary switch sheet is provided with a second proximity switch, and the rotation range of said positioning bar is between the two second proximity switches.

A bracket is provided below the lower cylinder seat for mounting it, and the bracket, the lower cylinder seat and the upper cylinder head are fixedly connected through tie rods and nuts.

An expandable metal seal valve, comprising a valve head, a combination valve core, a valve seat and a valve block, wherein the valve head is further mounted with the above-mentioned driving device, the combination valve core includes a central wedge cone and two side The wedge cone and the valve plate are integrally connected via a screw and a lateral pin, and can move up and down and rotate with the valve stem.

Beneficial effects of the present invention are as follows.
1. This technical solution uses a straight stroke drive mechanism to control the vertical movement of the valve stem, a rotation drive mechanism to control the forward and reverse rotation of the valve stem around its axis, and a double action switch mechanism to control the straight stroke. It controls the opening and closing of the stroke drive mechanism and the rotation drive mechanism, is easy to operate, and has high control accuracy.
2. The straight stroke drive mechanism in this technical solution is to select and pressurize one of the two cavities above and below the piston to achieve the upward or downward movement of the piston, and when the piston moves, the valve It drives the synchronous lifting and lowering of the stem, has a simple structure, and has excellent operational stability.
3. The rotary driving mechanism in this technical solution presses the fixed plate and the second inlet/outlet hole of the cylinder block, so that the cavity between the rotary plate and the fixed plate changes with the pressure change, and the rotary plate is The rotation of the valve stem is driven through the connecting sleeve at the same time as it approaches or leaves the fixed plate, and the rotation accuracy is high and the operation stability is excellent.

1 is a structural schematic diagram of an expandable metal seal valve according to an embodiment of the present invention; FIG. FIG. 2 is a schematic cross-sectional view of the AA portion of FIG. 1; FIG. 2 is a schematic cross-sectional view of the BB portion of FIG. 1; FIG. 2 is a view in the direction of arrow A in FIG. 1;

Embodiments of the present invention will be further described below with reference to the drawings.

As shown in the figure, a drive device for an expandable metal seal valve, comprising a valve stem 1, a straight stroke drive mechanism 2, a rotary drive mechanism 3 and a double action switch mechanism 4, wherein the straight stroke drive mechanism The movable end of 2 is fitted to the valve stem 1 and drives its vertical linear motion, the movable end of the rotary drive mechanism 3 is fitted to the valve stem 1 and drives its forward and reverse rotation, The straight stroke and the forward and reverse rotation angles of the valve stem 1 are controlled by the double-action switch mechanism 4, and the technical solution uses the straight stroke drive mechanism to control the vertical movement of the valve stem, and The rotation drive mechanism controls forward and reverse rotation around the axis of the valve stem, and the double action switch mechanism controls opening and closing of the straight stroke drive mechanism and the rotation drive mechanism. The straight stroke driving mechanism 2 and the rotary driving mechanism in this embodiment adopt pneumatic structure, and the following content introduces the technical solution adopting pneumatic structure.

The straight stroke drive mechanism 2 includes an upper cylinder block 21 , an upper cylinder seat 22 , an upper cylinder head 23 and a piston 24 , both of which are fitted on the valve stem 1 . The upper and lower ends of the upper cylinder block 21 are respectively connected to the outer periphery of the upper cylinder head 23 and the upper cylinder seat 22 by sealing to form a cavity, The inner ring of the piston 24 is mounted on the valve stem 1 and its outer ring is slidingly engaged with the inner wall of the upper cylinder block 21 with a seal, and the straight stroke drive mechanism in this technical solution is above and below the piston By selecting and pressurizing one of the two cavities, the piston can be raised or lowered, and when the piston moves, the valve stem can be driven up and down synchronously. The structure is simple and the operation is stable. The piston is fitted to the valve stem and drives its up-and-down rotation, but can rotate in opposition therebetween.

A bearing seat 26 is provided at a position corresponding to the piston 24 of the valve stem 1, a bearing 27 is provided between the bearing seat 26 and the inner ring of the piston 24, and the bearing seat 26 abuts on the upper surface of the bearing 27. A lock nut 28 is further provided to prevent the piston from rotating when the valve stem rotates, to increase the frictional force, a locking washer is mounted between the two lock nuts, and the bearing in this embodiment is flat. Adopt roller bearings.

The rotary driving mechanism 3 includes a lower cylinder seat 31, a lower cylinder block 32, a connecting sleeve 33, and a rotating component mounted on the connecting sleeve 33, and the upper and lower ends of the lower cylinder block 32 are respectively connected to the upper cylinder seats 22. and the outer periphery of the lower cylinder seat 31 to form a cavity, the connecting sleeve 33 is fitted to the valve stem 1 and both are interlockingly connected, and the rotating components are fixed in pairs. A plate 34 and a rotating plate 35 are both mounted vertically and radially between the connecting sleeve 33 and the lower cylinder block 32 with seals, respectively, and the rotating plate 35 has one end fixedly connected to the connecting sleeve 33 and the other end slidably engaged with the inner wall of the lower cylinder block 32 with a seal, and a second access hole 36 passing through the fixed plate 34 and the lower cylinder block 32 is formed. A pressure chamber of variable size is formed between the fixed plate 34 and the rotary plate 35, and the rotary driving mechanism in the present technical solution presses the second inlet/outlet holes in the fixed plate and the cylinder block to , The cavity between the rotating plate and the fixed plate accompanies the pressure change, the rotating plate drives the rotation of the valve stem through the connecting sleeve at the same time as it approaches or leaves the fixed plate, the rotation accuracy is high, and the operation Excellent stability.

In addition, there are three sets of fixed plates and rotating plates in this embodiment, which are evenly distributed in the circumferential direction of the valve stem.

The second access hole 36 is composed of two first screw holes 361 of the lower cylinder block 32 and two second screw holes 362 of the fixing plate 34, and the two first screw holes 361 extend vertically. Two through-holes 341 corresponding to the two second screw holes 362 provided and communicating with the second screw holes 362 are provided on both sides of the fixing plate 34, respectively. There are two sets, one set is an intake hole and one set is an exhaust hole, as shown in FIG. The second stationary plate is approached and the gas between the rotating plate and the second stationary plate is exhausted from the second stationary plate.

A plurality of guide grooves 331 are provided in the inner hole of the connecting sleeve 33 in the vertical direction and penetrate vertically, and the valve stem 1 is provided with a plurality of guide keys 332 which are slidably engaged with the guide grooves 331, The guide groove penetrates vertically, the valve stem can move freely up and down within the connecting sleeve, but is restricted by the connecting sleeve when rotating, and both rotate in conjunction with each other,
Adjusting screws 342 are provided on both left and right sides of the fixing plate 34. By screwing the adjusting screw to the mounting depth, the rotation range of the rotating plate is controlled, thereby adjusting the rotation angle of the valve stem.

The outer surface of the lower cylinder block 32 is covered with a pressing ring 37 , and the inner wall of the pressing ring 37 is provided with two horizontal ventilation ring grooves 371 . A rubber seal plate 38 is provided between the ventilation ring grooves 371, and a ring-shaped mounting groove 372 is provided at the mouth end of the ventilation ring groove 371 for mounting the rubber seal plate 38. The rubber seal plate 38 has a first screw hole 361. , and the pressure ring 37 is provided with a pipe joint 373 communicating with the ventilation ring groove 371. The purpose of this design is one intake pipe joint for intake and three inflated The purpose is to allow the fixed plate to expand into three pressure chambers at the same time.

The double action switch mechanism 4 is
a positioning board 41 fixedly attached to the tip of the valve stem 1 and provided with a positioning bar 42 extending outward in the circumferential direction;
a lift switch sheet 43 fixedly attached to the upper surface of the upper cylinder head 23 in the vertical direction;
a pair of rotary switch seats 44 fixedly attached to the upper surface of the upper cylinder head 23;
A first proximity switch 431 is provided on the lifting switch sheet 43 so as to face each other in the vertical direction and has an appropriate spacing, the positioning board 41 is positioned between the two first proximity switches 431, Each rotary switch seat 44 is provided with a second proximity switch 441, the rotation range of the positioning bar 42 is between the two second proximity switches 441,
When the valve stem is raised or lowered, the positioning platen is within the range of the two first proximity switches, and when approaching the first proximity switch, it sends a signal to the controller, which in turn controls the expansion device. and expand into each pressure chamber,
When the valve stem rotates forward and backward, the rotation range of the positioning bar is between the two second proximity switches, and the working principle is the same as the first proximity switch, sending a signal to the control device.

A bracket 5 is provided below the lower cylinder seat 31 for mounting it, and the bracket 5, the lower cylinder seat 31 and the upper cylinder head 23 are fixedly connected through tie rods and nuts.

An expandable metal seal valve, comprising a valve head 6, a combination valve core 9, a valve seat 7 and a valve block 8, wherein the valve head 6 is further mounted with the above driving device, and the combination valve core 9 is It consists of a wedge cone 91 in the center and valve plates 92 on both sides, the wedge cone 91 and the valve plates 92 are connected through a T-shaped groove, and the wedge cone 91 and the valve stem 1 are integrated through screws and lateral pins. , and can move up and down and rotate with the valve stem 1, and the valve in this technical solution has all the above technical effects.

In describing the present invention, it should be noted that the terms "central", "longitudinal", "lateral", "top", "bottom", "front", "back", "left", "right", "vertical" , "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings and are used to describe and explain the invention. and does not indicate or imply that any device or element must have, or be constructed and operated in, any particular orientation; It cannot be understood as a limitation of the invention. Furthermore, the terms "first" and "second" are used only to describe purpose and should not be understood to indicate or imply any relative importance.

In the description of the present invention, it is still to be understood that the terms "attachment", "coupling" and "connection" are to be understood in a broad sense, and can be, for example, a fixed connection, a removable It may be a possible connection or an integral connection, a mechanical connection or an electrical connection, a direct connection, an indirect connection through an intermediary, or a connection within two elements. good too. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific situation. In the description of the present invention, "plurality" means two or two or more, unless otherwise specified.

As can be understood by those skilled in the art, the present invention has been described based on the above specific embodiments, but the technical idea of the present invention is not limited to the present invention, and the idea of the present invention is used. Any modifications are to be included within the scope of the claims.

Claims (7)

A driving device for an expandable metal seal valve, comprising a valve stem (1), a straight stroke drive mechanism (2), a rotary drive mechanism (3) and a double action switch mechanism (4), said straight stroke The movable end of the drive mechanism (2) is fitted to the valve stem (1) and drives its vertical linear motion, and the movable end of the rotary drive mechanism (3) is fitted to the valve stem (1) and Driving its forward and reverse rotation, the straight stroke and forward and reverse rotation angles of the valve stem (1) are all controlled by the double action switch mechanism (4),
Said straight stroke drive mechanism (2) comprises an upper cylinder block (21), an upper cylinder seat (22), an upper cylinder head (23) and a piston (24), said upper cylinder head (23) and upper The cylinder seats (22) are both fitted to the valve stem (1) and each have a first inlet/outlet hole (25), and the upper and lower ends of the upper cylinder block (21) are respectively connected to the upper cylinder head ( 23) and the outer circumference of the upper cylinder seat (22) to form one cavity, the inner ring of said piston (24) is attached to said valve stem (1) and its outer ring is attached to said upper cylinder block ( 21) is slidably engaged with a seal on the inner wall of
Said rotary drive mechanism (3) comprises a lower cylinder seat (31), a lower cylinder block (32), a connecting sleeve (33) and a rotating component mounted on said connecting sleeve (33), said lower cylinder block The upper and lower ends of (32) are respectively connected to the outer periphery of the upper cylinder seat (22) and the lower cylinder seat (31) by sealing to form a cavity, and the connecting sleeve (33) is connected to the valve stem (1). mated and interlockingly connected, said rotating component comprises a plurality of pairs of stationary plates (34) and rotating plates (35), each of said stationary plates (34) and rotating plates (35) being said mounted with a seal vertically and radially between a connecting sleeve (33) and a lower cylinder block (32), one end of said rotating plate (35) being fixedly connected to said connecting sleeve (33) and the other end is slidably engaged with the inner wall of the lower cylinder block (32) with a seal and provided with a second access hole (36) passing through the fixed plate (34) and the lower cylinder block (32), and the fixed plate A pressure chamber of variable size is formed between (34) and rotating plate (35) ,
A plurality of guide grooves (331) are provided in the inner hole of the connecting sleeve (33) in the vertical direction and penetrate vertically, and the valve stem (1) is in sliding engagement with the guide grooves (331). is provided with a guide key (332) of
Adjustment screws (342) are provided on both left and right sides of the fixing plate (34),
A driving device for an expandable metal seal valve, characterized by: A bearing seat (26) is provided at a position corresponding to the piston (24) of the valve stem (1), and a bearing (27) is provided between the bearing seat (26) and an inner ring of the piston (24), The bearing seat (26) is further provided with a lock nut (28) that abuts on the upper surface of the bearing (27).
The driving device for an expandable metal seal valve according to claim 1, characterized in that: Said second access holes (36) are composed of two first screw holes (361) in the lower cylinder block (32) and two second screw holes (362) in the fixing plate (34). The first screw hole (361) is provided in the vertical direction and corresponds to the two second screw holes (362) one-to-one, and the second screw holes (362) are provided on both sides of the fixing plate (34). ) are provided with through holes (341) communicating with each other,
The driving device for an expandable metal seal valve according to claim 1, characterized in that: The outer surface of the lower cylinder block (32) is covered with a pressing ring (37), the inner wall of the pressing ring (37) is provided with two horizontal ventilation ring grooves (371), and the ventilation ring groove ( 371) and the outer surface of the lower cylinder block (32) is provided with a rubber seal plate (38). A mounting groove (372) is provided, the rubber seal plate (38) is provided with a through hole (381) corresponding to the first screw hole (361), and the pressure ring (37) is provided with a ventilation ring groove (371). A communicating pipe joint (373) is provided;
4. The drive device for an expandable metal seal valve according to claim 3, characterized in that: The double action switch mechanism (4) is
a positioning board (41) provided with a positioning bar (42) fixedly attached to the tip of the valve stem (1) and extending outward in the circumferential direction;
a lift switch sheet (43) fixedly mounted vertically on the upper surface of the upper cylinder head (23);
a pair of rotary switch seats (44) fixedly attached to the upper surface of the upper cylinder head (23);
A first proximity switch (431) is provided on the up/down switch sheet (43) facing each other in the vertical direction and having an appropriate spacing. 431), each rotary switch seat (44) is provided with one second proximity switch (441), and the rotation range of the positioning bar (42) is two second proximity switches ( 441) between
The driving device for an expandable metal seal valve according to claim 1, characterized in that: A bracket (5) is provided below the lower cylinder seat (31) to mount it, and the bracket (5), the lower cylinder seat (31) and the upper cylinder head (23) are connected by tie rods and nuts. fixedly connected via
The driving device for an expandable metal seal valve according to claim 1, characterized in that: An expandable metal seal valve comprising a valve head (6), a combination valve core (9), a valve seat (7) and a valve block (8), wherein the valve head (6) further comprises claims 1- 7 , wherein said combination valve core (9) consists of a central wedge cone (91) and two side valve plates (92), said wedge cone (91) and valve plates (92) is slidably connected through a T-shaped groove, said wedge cone (91) and valve stem (1) are integrally connected through a screw and a lateral pin, and ascends and descends and rotates along with the valve stem (1). be able to,
An expandable metal seal valve characterized by:

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