CN210661410U

CN210661410U - Adjustable eccentric butterfly valve

Info

Publication number: CN210661410U
Application number: CN201921516313.7U
Authority: CN
Inventors: 龙长贵
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2020-06-02
Anticipated expiration: 2029-09-12

Abstract

The utility model provides a regulation formula eccentric butterfly valve, including valve body, valve rod, disk seat and butterfly plate, the upper and lower both ends of valve rod all form the eccentric axostylus axostyle to same one side deflection, the connection face middle part of butterfly plate is along transversely being equipped with torsion mechanism, the bilateral symmetry is equipped with two eccentric adjustment mechanism about the torsion mechanism, torsion mechanism includes rocker and torsional spring, eccentric adjustment mechanism includes the slider, the roof, bottom plate and spring, two sliders centre gripping valve rod middle parts respectively, when leading to sealed not tight because of butterfly plate or disk seat wearing and tearing, the butterfly plate rotates and continues to rotate the valve rod after closing flat, the eccentric rotation in the relative both ends in valve rod middle part, eccentric adjustment mechanism and torsion mechanism action, make the butterfly plate be close to the disk seat direction, the sealed face of circle in the sealed face extrusion disk seat of butterfly plate excircle skew, increase. The utility model discloses sealed adjustable between butterfly valve butterfly plate and the disk seat, the back appears wearing and tearing, and it just can realize sealed again to rotate the valve rod, need not to change butterfly valve or maintenance, effectively practices thrift the cost.

Description

Adjustable eccentric butterfly valve

Technical Field

The utility model belongs to the technical field of the butterfly valve, concretely relates to regulation formula eccentric butterfly valve.

Background

A butterfly valve, also called a flap valve, is a regulating valve with simple structure, and can be used for on-off control of low-pressure pipeline fluid, and is a valve in which a butterfly plate is a disk, and rotates around a valve rod to make the butterfly plate rotate back and forth by about 90 degrees to open, close or regulate the fluid flow. The butterfly valve has the advantages of simple structure, small volume, light weight, less material consumption, small installation size, small driving moment, simple and convenient operation and rapidness, and simultaneously has good flow regulation function and sealing closing characteristic, thereby being one of the fastest valve varieties developed in the last ten years.

After the butterfly plate sealing surface or the valve seat sealing surface of the existing butterfly valve is abraded, the butterfly plate is flattened and still cannot be effectively sealed, and fluid leakage easily occurs to the butterfly valve, so that the butterfly valve is scrapped or the butterfly plate or the valve seat needs to be replaced, and the replacement cost is high and the maintenance is complex.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art exists, the utility model provides a regulation formula eccentric butterfly valve, the valve rod of this butterfly valve is the eccentric axostylus axostyle, lead to sealed when not tight because of butterfly plate or disk seat wearing and tearing, rotate at the butterfly plate and continue to rotate the valve rod after closing and tie, the relative valve rod both ends eccentric rotation in middle part of valve rod, thereby promote the butterfly plate and be close to the disk seat direction, the sealed face of disk seat is extruded to the sealed face of butterfly plate, increase sealed specific pressure, in order to improve the leakproofness, prevent the fluid seepage, sealed adjustable between the butterfly plate of this butterfly valve and the disk seat, need not to change the butterfly valve or maintain.

The utility model discloses a following technical scheme realizes:

an adjustable eccentric butterfly valve comprises a valve body, a valve rod, a valve seat and a butterfly plate; the upper end and the lower end of the valve rod are deflected towards the same side to form an eccentric shaft rod, the upper end and the lower end of the valve rod are rotatably connected with the valve body, the valve seat is fixedly installed inside the valve body, one surface of the butterfly plate is a sealing surface, the other surface of the butterfly plate is a connecting surface, an outer circle oblique sealing surface is arranged on the outer peripheral side of the sealing surface of the butterfly plate, an inner circle oblique sealing surface is arranged on the valve seat, and when the butterfly plate is closed, the outer circle oblique sealing surface of the butterfly plate is abutted against the inner circle oblique sealing surface of the valve seat so as;

the middle part of the connecting surface of the butterfly plate is transversely provided with a torsion mechanism, the upper side and the lower side of the torsion mechanism are symmetrically provided with two eccentric adjusting mechanisms, the torsion mechanism comprises a rocker and a torsion spring, the rocker is vertical to the valve rod, one end of the rocker is fixedly connected with the valve rod, the torsion spring is sleeved on the valve rod, a torsion structure is formed among the torsion spring, the butterfly plate and the rocker to enable the end part of the other end of the rocker to be abutted against the butterfly plate, the stability between the valve rod and the butterfly plate can be ensured, the butterfly plate is prevented from shaking due to the flow of fluid when the butterfly plate is opened, the valve rod rotates to the closing and leveling process of the butterfly plate, one end of the rocker, which is far away from the valve rod, is always abutted against the butterfly plate under the acting force of the torsion spring, the eccentric adjusting mechanisms comprise a sliding block, a top plate, a bottom plate and a spring, the sliding block comprises an, the two arc-shaped grooves form a round hole, the valve rod is provided with an annular groove, the upper clamping plate and the lower clamping plate are clamped at the annular groove of the valve rod, the upper clamping plate and the lower clamping plate are fixedly connected through a plurality of screws, specifically, the upper clamping plate is provided with a plurality of countersunk through holes, the lower clamping plate is provided with threaded holes corresponding to the countersunk through holes one by one, the screws are convenient to mount, the valve rod can rotate relative to the sliding block, the top plate is fixedly mounted at the upper end of the bottom plate through a plurality of screws, specifically, the top plate is provided with a plurality of countersunk through holes, the bottom plate is provided with threaded holes corresponding to the countersunk through holes one by one, the screws are convenient to mount, a square sliding groove is arranged between the top plate and the bottom plate, specifically, the lower end surface of the top plate and the upper end surface of the bottom plate are both provided with direction grooves, the two square, the two ends of the spring are fixedly connected with the right end face of the sliding block and the right side wall face of the square sliding groove respectively, the bottom plate is fixedly connected with the connecting face of the butterfly plate through a plurality of screws, specifically, the bottom plate is provided with a plurality of countersunk through holes, the butterfly plate is provided with threaded holes which correspond to the countersunk through holes one to one, the screws are convenient to mount, and the sliding blocks of the two eccentric adjusting mechanisms respectively clamp the middle part of the valve rod; when the butterfly plate is in an open state, under the action of a torsional spring, one end of the rocker, which is far away from the valve rod, always abuts against the butterfly plate, when the butterfly plate is to be closed and leveled to cut off the flow channel, two ends of the valve rod rotate relative to the valve body, the middle part of the valve rod drives the butterfly plate to rotate until the butterfly plate is closed and leveled to cut off the flow channel, an outer circle oblique sealing surface of the butterfly plate abuts against an inner circle oblique sealing surface of the valve seat, the butterfly valve is in a closed state, a central axis of the middle part of the valve rod and a vertical central line of the butterfly plate are positioned on the same plane, the plane is vertical to a connecting surface of the butterfly plate, when the butterfly plate of the butterfly valve is closed and leveled, a small fluid leakage still occurs, the valve rod continues to be rotated, the middle part of the valve rod is eccentric relative to two ends of the valve rod, when the two ends of the valve rod rotate, the middle part of the valve, the middle part of the valve rod rotates relative to the sliding block, the spring is compressed, the butterfly plate moves leftwards, meanwhile, the middle part of the valve rod drives the rocker to rotate, one end, away from the valve rod, of the rocker is gradually separated from the butterfly plate, the torque between the rocker and the butterfly plate is increased under the action of the torsion spring, the butterfly plate is close to the valve seat direction under the action of the eccentric adjusting mechanism, the torsion mechanism and the middle part of the valve rod, the outer circle oblique sealing surface of the butterfly plate extrudes the inner circle oblique sealing surface of the valve seat, the sealing specific pressure is increased, the sealing performance is improved, fluid leakage is prevented, when the valve rod is rotated to open a flow channel in the valve body, the butterfly plate rotates and resets relative to the middle part of the valve rod under the action of the restoring torsion force of the torsion spring, one end, away from the valve rod, of the rocker; the butterfly plate of the butterfly valve is adjustable in sealing between the butterfly plate and the valve seat, and after abrasion occurs, the butterfly valve does not need to be replaced or maintained, so that cost can be effectively saved.

Further, be equipped with last through-hole and the lower through-hole that is used for interlude valve rod on the valve body respectively, go up the vertical central line that the axial lead of through-hole and lower through-hole all deviates from the valve body, form off-centre, the lower extreme of valve rod inserts down the through-hole and rotate the connection, the upper end of valve rod passes last through-hole and rotate the connection, during the installation, the lower extreme of valve rod can be followed in the through-hole inserts the valve body until inserting down the through-hole, during the dismantlement, the upper end of valve rod can be taken out from lower through-hole, makes the.

Further, an upper shaft sleeve is arranged in the upper through hole, an upper shaft sleeve is sleeved on the valve rod, an upper gland is arranged at one end, facing outwards, of the upper through hole, the upper gland is sleeved on the valve rod and fixedly connected with the valve body through a plurality of screws, specifically, the upper gland is provided with a plurality of countersunk through holes, the valve body is provided with threaded holes corresponding to the countersunk through holes one to one, screws are convenient to install, upper valve rod packing is filled between the upper gland and the upper shaft sleeve in the upper through hole, the upper shaft sleeve can avoid friction between the valve rod and the valve body, the upper valve rod packing can seal the upper through hole and prevent fluid leakage, the upper gland can enable the valve rod to be hermetically installed, a lower shaft sleeve is arranged in the lower through hole and sleeved on the valve rod, a lower gland is arranged at one end, facing outwards, of the lower through hole is sealed and blocked by the lower gland and fixedly connected with the valve body through a plurality of screws, the valve body is provided with threaded holes which correspond to the countersunk head through holes one to one, screws are convenient to mount, lower valve rod packing is filled between the lower gland and the lower shaft sleeve in the lower through hole, the lower shaft sleeve can avoid friction between the valve rod and the valve body, the lower valve rod packing can seal the lower through hole, fluid leakage is prevented, and the lower gland can block the lower through hole.

Furthermore, the end faces of the outer ends of the upper shaft sleeve and the lower shaft sleeve are provided with threaded holes, so that the shaft sleeves can be taken out conveniently by disassembling through connecting screws.

Further, the torsion mechanism also comprises two bases and connecting rods, the two bases are symmetrically arranged along the rocker and are respectively and fixedly connected with the connecting surface of the butterfly plate through a plurality of screws, specifically, the base is provided with a plurality of countersunk through holes, the butterfly plate is provided with threaded holes which are in one-to-one correspondence with the countersunk through holes, the screws are convenient to install, the connecting rod is erected between the two bases, the connecting rod is parallel to the valve rod and is positioned on the left side of the valve rod, the torsion spring is a double torsion spring, the middle supporting leg of the torsion spring is hooked on the rocker and is far away from one end of the valve rod, the two end supporting legs of the torsion spring are hooked on the connecting rod, so as to form a torsion structure, under the condition of no external force, the middle supporting leg of the torsion spring presses the rocker towards the butterfly plate, and enables one end of the rocker far away from the valve rod to abut against the butterfly plate, when the valve rod is continuously, make the butterfly plate not rotate to valve rod one end is kept away from to the rocker separates gradually with the butterfly plate, and the moment of torsion increase between rocker and the butterfly plate when the butterfly plate is opened, under the torsional spring torsional force effect, the rocker resets, and valve rod one end is kept away from to the rocker offsets with the butterfly plate, ensures the stability between valve rod and the butterfly plate, and fluid flow leads to the butterfly plate to rock when preventing that the butterfly plate from opening.

Further, the cover is equipped with the clamp on the valve rod, and the clamp includes hoop cover and lower hoop cover, goes up hoop cover and lower hoop cover both ends respectively through a plurality of screw fixed connection about, and is concrete, goes up hoop cover and is equipped with a plurality of countersunk head through-holes, and lower hoop cover is equipped with the screw hole with a plurality of countersunk head through-hole one-to-one, the mounting screw of being convenient for, all be equipped with between valve rod and the hoop cover under the hoop cover and prevent changeing the cotter key, the one end of rocker and the one end fixed connection of lower hoop cover, and is concrete, rocker and lower hoop cover integrated into one piece, and the valve rod can drive the rocker through the clamp and rotate.

Further, a positioning pile is fixedly arranged on the inner wall of the flow channel of the valve body, specifically, the positioning pile is fixed on the inner wall of the flow channel through welding, when the valve rod is rotated to drive the butterfly plate to rotate until the peripheral side edge of the connecting surface of the butterfly plate abuts against the positioning pile, the butterfly plate is flattened and the flow channel is cut off, the outer circle oblique sealing surface of the butterfly plate abuts against the inner circle oblique sealing surface of the valve seat, the butterfly valve is in a closed state, when the butterfly plate of the butterfly valve is flattened and still has small fluid leakage, the valve rod is continuously rotated, the middle part of the valve rod is eccentric relative to the two ends of the valve rod, when the two ends of the valve rod rotate, the middle part of the valve rod deflects and approaches to the direction of the valve seat, the middle part of the valve rod triggers an eccentric adjusting mechanism to move, the middle part of the valve rod rotates relative to the sliding block, the spring is compressed, the butterfly plate moves, the rocker is kept away from valve rod one end and is partd gradually with the butterfly plate, and under the torsional spring effect, the moment of torsion increase between rocker and the butterfly plate, under eccentric adjustment mechanism, torsion mechanism and valve rod middle part deflection effect, the butterfly plate is close to the disk seat direction, the sealed face of interior circle skew of the sealed face extrusion disk seat of excircle skew of butterfly plate, increase sealed specific pressure, in order to improve the leakproofness, prevent the fluid seepage, when rotating the valve rod in order to open the inside runner of valve body, under the reply torsional force effect of torsional spring, the relative valve rod middle part of butterfly plate rotates and resets.

Further, the connection face of butterfly plate is equipped with the end cover, and the week side of end cover and the week side of butterfly plate are through a plurality of screw fastening connection, and is concrete, and the week side of end cover is equipped with a plurality of countersunk head through-holes, and the butterfly plate is equipped with the screw hole with a plurality of countersunk head through-hole one-to-one, the installation screw of being convenient for, and the end cover is irregular arc sphere, can cover valve rod, eccentric adjustment mechanism and torsion mechanism, can reduce the fluid and to eccentric adjustment mechanism and torsion mechanism's washing away.

Furthermore, the valve seat and the butterfly plate are made of tungsten carbide, so that the valve seat and the butterfly plate are high in overall high-temperature resistance and wear resistance.

According to the above technical scheme, the utility model provides a pair of regulation formula eccentric butterfly valve, beneficial effect lies in: when the butterfly valve is not tight in sealing due to abrasion of the butterfly plate or the valve seat, the valve rod continues to be rotated after the butterfly plate rotates to be flat, the middle part of the valve rod eccentrically rotates relative to two ends of the valve rod, so that the eccentric adjusting mechanism and the torsion mechanism are triggered to act, the butterfly plate approaches to the direction of the valve seat, the inclined sealing surface of the outer circle of the butterfly plate extrudes the inclined sealing surface of the inner circle of the valve seat, the sealing specific pressure is increased, the sealing performance is improved, fluid leakage is prevented, the sealing between the butterfly plate and the valve seat of the butterfly valve is adjustable, after abrasion occurs, the valve rod can be sealed again by rotating the valve rod, the butterfly valve does not need to.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is the schematic view of the structure of the radial section of the valve body (butterfly plate is flat).

Fig. 2 is the structure schematic diagram (the butterfly plate is opened) along the axial section of the valve body.

Fig. 3 is a schematic view of the butterfly plate structure of the present invention.

3 fig. 3 4 3 is 3 a 3 schematic 3 view 3 of 3 a 3 partial 3 structure 3 in 3 the 3 direction 3 of 3 a 3- 3 a 3 in 3 fig. 3 3 3 according 3 to 3 the 3 present 3 invention 3. 3

Fig. 5 is a schematic view of a partial structure in the direction B-B in fig. 3 according to the present invention.

In the drawings: 1-valve body, 2-valve rod, 3-valve seat, 31-inner circle oblique sealing surface, 4-butterfly plate, 41-outer circle oblique sealing surface, 5-torsion mechanism, 51-rocker, 52-torsion spring, 53-base, 54-connecting rod, 55-hoop, 56-anti-rotation pin key, 6-eccentric adjusting mechanism, 61-sliding block, 62-top plate, 63-bottom plate, 64-spring, 71-upper shaft sleeve, 72-upper gland, 73-upper valve rod packing, 74-lower shaft sleeve, 75-lower gland, 76-lower valve rod packing, 8-locating pile and 9-end cover.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

In the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplification of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 5, an adjustable eccentric butterfly valve comprises a valve body 1, a valve rod 2, a valve seat 3 and a butterfly plate 4; the upper end and the lower end of the valve rod 2 are deflected towards the same side to form an eccentric shaft rod, the upper end and the lower end of the valve rod 2 are rotatably connected with the valve body 1, the valve seat 3 is fixedly installed inside the valve body 1, one surface of the butterfly plate 4 is a sealing surface, the other surface of the butterfly plate 4 is a connecting surface, an outer circle oblique sealing surface 41 is arranged on the outer periphery side of the sealing surface of the butterfly plate 4, an inner circle oblique sealing surface 31 is arranged on the valve seat 3, and when the butterfly plate 4 is closed, the outer circle oblique sealing surface 41 of the butterfly plate 4 is abutted against the inner circle oblique sealing surface 31 of the valve seat 3 so as; the middle part of the connecting surface of the butterfly plate 4 is transversely provided with a torsion mechanism 5, the upper side and the lower side of the torsion mechanism 5 are symmetrically provided with two eccentric adjusting mechanisms 6, the torsion mechanism 5 comprises a rocker 51, a torsion spring 52, a base 53 and a connecting rod 54, the rocker 51 is perpendicular to the valve rod 2, one end of the rocker 51 is fixedly connected with the valve rod 2, the base 53 is provided with two bases 53, the two bases 53 are symmetrically arranged along the rocker 51 and are respectively and fixedly connected with the connecting surface of the butterfly plate 4 through a plurality of screws, the connecting rod 54 is erected between the two bases 53, the connecting rod 54 is parallel to the valve rod 2 and is positioned at the left side of the valve rod 2, the torsion spring 52 is a double torsion spring 52, the torsion spring 52 is sleeved on the valve rod 2, the middle supporting leg of the torsion spring 52 is hooked on the rocker 51 and is far away from one end of the valve rod 2, the, the middle supporting leg of the torsion spring 52 presses the rocker 51 to the butterfly plate 4, one end of the rocker 51, which is far away from the valve rod 2, is abutted against the butterfly plate 4, after the butterfly valve is closed and the butterfly plate 4 is flattened, when the rocker 51 continuously rotates along with the valve rod 2, one end of the rocker 51, which is far away from the valve rod 2, is gradually separated from the butterfly plate 4, the torque between the rocker 51 and the butterfly plate 4 is increased, when the butterfly plate 4 is opened, under the action of the torsional force of the torsion spring 52, the rocker 51 is reset, one end of the rocker 51, which is far away from the valve rod 2, is abutted against the butterfly plate 4, so that the stability between the valve rod 2 and the butterfly plate 4 is ensured, the butterfly plate 4 is prevented from shaking due to the fluid flow when the butterfly plate 4 is opened, the eccentric adjusting mechanism 6 comprises a sliding block 61, a top plate 62, a bottom plate 63 and a spring 64, the sliding block 61 comprises an upper clamping plate and, the two arc-shaped grooves form a round hole, the valve rod 2 is provided with an annular groove, the upper clamping plate and the lower clamping plate are connected at the annular groove of the valve rod 2 in a clamping manner, the upper clamping plate and the lower clamping plate are fixedly connected through a plurality of screws, the valve rod 2 can rotate relative to the sliding block 61, the top plate 62 is fixedly arranged at the upper end of the bottom plate 63 through a plurality of screws, a square sliding groove is arranged between the top plate 62 and the bottom plate 63, specifically, the lower end surface of the top plate 62 and the upper end surface of the bottom plate 63 are both provided with a direction groove, the two square grooves form a square sliding groove, the sliding block 61 and the spring 64 are both arranged in the square sliding groove, the sliding block 61 can transversely move in the square sliding groove, the two ends of the spring 64 are respectively fixedly connected with the right end surface of the sliding block 61 and the right side wall surface of the square sliding groove, the bottom, a positioning pile 8 is fixedly arranged on the inner wall of the flow channel of the valve body 1, and specifically, the positioning pile 8 is fixed on the inner wall of the flow channel through welding; when the butterfly valve is not tight in sealing caused by abrasion of the butterfly plate 4 or the valve seat 3, the valve rod 2 is continuously rotated after the butterfly plate 4 is rotated to be leveled off, the middle part of the valve rod 2 rotates eccentrically relative to two ends of the valve rod 2, so that the eccentric adjusting mechanism 6 and the torsion mechanism 5 are triggered, the butterfly plate 4 approaches to the valve seat 3, the outer circular inclined sealing surface 41 of the butterfly plate 4 extrudes the inner circular inclined sealing surface 31 of the valve seat 3, the sealing specific pressure is increased, the sealing performance is improved, fluid leakage is prevented, the sealing between the butterfly plate 4 and the valve seat 3 of the butterfly valve is adjustable, after abrasion occurs, the valve rod can be sealed again by rotating, the butterfly valve does not need to be replaced or maintained, and the cost is effectively.

In this embodiment, be equipped with last through-hole and the lower through-hole that is used for interlude valve rod 2 on the valve body 1 respectively, go up the vertical central line that the axial lead of through-hole and lower through-hole all deviates from valve body 1, form off-centre, through-hole and swivelling joint under the lower extreme of valve rod 2 inserts, through-hole and swivelling joint are passed to the upper end of valve rod 2, during the installation, the lower extreme of valve rod 2 can be followed in last through-hole inserts valve body 1 until inserting the through-hole down, during the dismantlement, the through-hole can be taken out down from to the upper end of valve rod 2.

In this embodiment, an upper shaft sleeve 71 is disposed in the upper through hole, the upper shaft sleeve 71 is sleeved on the valve rod 2, an upper gland 72 is disposed at an outward end of the upper through hole, the upper gland 72 is sleeved on the valve rod 2 and fixedly connected with the valve body 1 through a plurality of screws, an upper valve rod packing 73 is filled between the upper gland 72 and the upper shaft sleeve 71 in the upper through hole, the upper shaft sleeve 71 can avoid friction between the valve rod 2 and the valve body 1, the upper valve rod packing 73 can seal the upper through hole and prevent fluid leakage, the upper gland 72 can seal the valve rod 2, a lower shaft sleeve 74 is disposed in the lower through hole, the lower shaft sleeve 74 is sleeved on the valve rod 2, a lower gland 75 is disposed at an outward end of the lower through hole, the lower gland 75 blocks the lower through hole and is fixedly connected with the valve body 1 through a plurality of screws, a lower valve rod packing 76 is filled between the lower gland 75 and the lower shaft sleeve 74 in the lower through hole, the lower valve stem packing 76 can seal the lower through hole to prevent fluid leakage, and the lower press cover 75 can seal the lower through hole.

In this embodiment, the end surfaces of the outward ends of the upper shaft sleeve 71 and the lower shaft sleeve 74 are respectively provided with a threaded hole, so that the shaft sleeves can be conveniently detached by connecting a screw rod.

In this embodiment, the cover is equipped with clamp 55 on the valve rod 2, and clamp 55 includes hoop cover and hoop cover down, goes up hoop cover and hoop cover down and controls both ends respectively through a plurality of screw fixed connection, all is equipped with between the hoop cover under valve rod 2 and the last hoop cover and prevents changeing cotter 56, the one end of rocker 51 and the one end fixed connection of hoop cover down, and is concrete, rocker 51 and hoop cover integrated into one piece down, and valve rod 2 can drive rocker 51 through clamp 55 and rotate.

In this embodiment, the connection face of butterfly plate 4 is equipped with end cover 9, and the all sides of end cover 9 passes through a plurality of screw fastening connection with all sides of butterfly plate 4, and end cover 9 is irregular arc sphere, can cover valve rod 2, eccentric adjustment mechanism 6 and torsion mechanism 5, and end cover 9 can be stretched out from upper and lower both sides to valve rod 2, can reduce the fluid to the erodeing of eccentric adjustment mechanism 6 and torsion mechanism 5.

In this embodiment, the valve seat 3 and the butterfly plate 4 are made of tungsten carbide, and have good overall high temperature resistance and wear resistance.

The working principle of the embodiment is as follows: when the butterfly plate 4 is in an open state, under the action of the torsion spring 52, one end of the rocker 51, which is far away from the valve rod 2, always abuts against the butterfly plate 4, so that the stability between the valve rod 2 and the butterfly plate 4 is ensured, and the butterfly plate 4 is prevented from shaking caused by fluid flow when the butterfly plate 4 is opened; when the butterfly valve is closed, two ends of the control valve rod 2 rotate relative to the valve body 1, the middle part of the valve rod 2 drives the butterfly plate 4 to rotate, until the peripheral side edge of the connecting surface of the butterfly plate 4 abuts against the positioning pile 8, the butterfly plate 4 is flattened and the flow channel is cut off, the outer circle oblique sealing surface 41 of the butterfly plate 4 abuts against the inner circle oblique sealing surface 31 of the valve seat 3, the butterfly valve is in a closed state, at the moment, the central axis of the middle part of the valve rod 2 and the vertical central line of the butterfly plate 4 are located on the same plane, the plane is perpendicular to the connecting surface of the butterfly plate 4, and in the flattening process of the butterfly plate 4, under the action of the torsion spring 52, the rocker; when the butterfly plate 4 of the butterfly valve is still slightly leaked after being flattened, namely the butterfly plate 4 or the valve seat 3 is abraded to cause untight sealing, the valve rod 2 is continuously rotated, the middle part of the valve rod 2 is eccentric relative to the two ends of the valve rod 2, when the two ends of the valve rod 2 are rotated, the middle part of the valve rod 2 deflects and approaches towards the direction of the valve seat 3, the positioning pile 8 is propped against the peripheral side edge of the connecting surface of the butterfly plate 4 to prevent the butterfly plate 4 from deflecting, the middle part of the valve rod 2 triggers the eccentric adjusting mechanism 6 to act, the middle part of the valve rod 2 rotates relative to the sliding block 61, the spring 64 is compressed, the butterfly plate 4 moves leftwards, meanwhile, the middle part of the valve rod 2 drives the rocker 51 to rotate, one end, far away from the valve rod 2, of the rocker 51 is gradually separated from the butterfly plate 4, the torque between the rocker 51 and the butterfly plate 4 is increased under the action of the torsion spring, the outer circle oblique sealing surface 41 of the butterfly plate 4 extrudes the inner circle oblique sealing surface 31 of the valve seat 3, the sealing specific pressure is increased, the sealing performance is improved, and fluid leakage is prevented; the butterfly plate 4 of this butterfly valve is sealed adjustable between 3 with the disk seat, and the back that appears wearing and tearing need not to change the butterfly valve or maintain, can effectively practice thrift the cost.

In the specification of the present invention, a large number of specific details are explained. It is understood, however, that the practice of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. The utility model provides an eccentric butterfly valve of regulation formula which characterized in that: comprises a valve body (1), a valve rod (2), a valve seat (3) and a butterfly plate (4); the upper end and the lower end of the valve rod (2) are deflected towards the same side to form an eccentric shaft rod, the upper end and the lower end of the valve rod (2) are rotatably connected with the valve body (1), the valve seat (3) is fixedly arranged in the valve body (1), one surface of the butterfly plate (4) is a sealing surface, the other surface of the butterfly plate is a connecting surface, an outer circle oblique sealing surface (41) is arranged on the outer peripheral side of the sealing surface of the butterfly plate (4), and an inner circle oblique sealing surface (31) is arranged on the valve seat (3);

the middle part of the connecting surface of the butterfly plate (4) is transversely provided with a torsion mechanism (5), the upper side and the lower side of the torsion mechanism (5) are symmetrically provided with two eccentric adjusting mechanisms (6), the torsion mechanism (5) comprises a rocker (51) and a torsion spring (52), the rocker (51) is vertical to the valve rod (2), one end of the rocker (51) is fixedly connected with the valve rod (2), the torsion spring (52) is sleeved on the valve rod (2), a torsion structure is formed among the torsion spring (52), the butterfly plate (4) and the rocker (51) to press against the end part of the other end of the rocker (51) against the butterfly plate (4), the eccentric adjusting mechanism (6) comprises a sliding block (61), a top plate (62), a bottom plate (63) and a spring (64), the sliding block (61) comprises an upper clamping plate and a lower clamping plate, a round hole convenient for installing the valve rod (2) is arranged between the upper clamping plate and the, the upper plate and the lower plate are connected at the annular groove of the valve rod (2), the upper plate and the lower plate are connected through a plurality of screws, a top plate (62) is fixedly installed at the upper end of a bottom plate (63) through a plurality of screws, a square sliding groove is formed between the top plate (62) and the bottom plate (63), a sliding block (61) and a spring (64) are installed in the square sliding groove, two ends of the spring (64) are fixedly connected with the right side wall surface of the sliding block (61) right end surface and the square sliding groove respectively, the bottom plate (63) is fixedly connected with the connecting surface of the butterfly plate (4) through a plurality of screws, and the sliding blocks (61) of the two eccentric adjusting mechanisms (6) respectively clamp the middle part of the valve rod (2).

2. The adjustable eccentric butterfly valve of claim 1, wherein: the valve body (1) is provided with an upper through hole and a lower through hole which are used for inserting the valve rod (2), the lower end of the valve rod (2) is inserted into the lower through hole and is in rotating connection, and the upper end of the valve rod (2) penetrates through the upper through hole and is in rotating connection.

3. The adjustable eccentric butterfly valve of claim 2, wherein: go up to be equipped with in the through-hole and go up axle sleeve (71), and go up axle sleeve (71) and establish on valve rod (2), go up the outside one end of through-hole and be equipped with gland (72), go up gland (72) and establish on valve rod (2), and through a plurality of screw fixed connection with valve body (1), go up to fill between gland (72) and last axle sleeve (71) in the through-hole and be equipped with valve rod filler (73), be equipped with down axle sleeve (74) down in the through-hole, and axle sleeve (74) cover establishes on valve rod (2) down, the outside one end of through-hole is equipped with down gland (75) down, and through a plurality of screw fixed connection with valve body (1) down through gland (75) shutoff down, down in the through-hole down fill between gland (75) and lower axle sleeve (74) and be equipped with down valve rod.

4. The adjustable eccentric butterfly valve of claim 3, wherein: the end faces of the outward ends of the upper shaft sleeve (71) and the lower shaft sleeve (74) are provided with threaded holes.

5. The adjustable eccentric butterfly valve of claim 1, wherein: torsion mechanism (5) still include base (53) and connecting rod (54), and base (53) are equipped with two, and two base (53) set up and all pass through a plurality of screw fixed connection respectively with the face of being connected of butterfly plate (4) along rocker (51) symmetry, and connecting rod (54) erect between two base (53), and connecting rod (54) are parallel and are located the left side of valve rod (2) with valve rod (2), torsional spring (52) are two torsional spring (52), and the middle part stabilizer blade hook of torsional spring (52) is kept away from valve rod (2) one end on rocker (51), and two tip stabilizer blades of torsional spring (52) all hook on connecting rod (54).

6. The adjustable eccentric butterfly valve of claim 5, wherein: the valve rod (2) is sleeved with a clamp (55), the clamp (55) comprises an upper hoop sleeve and a lower hoop sleeve, the left end and the right end of the upper hoop sleeve and the right end of the lower hoop sleeve are respectively connected through a plurality of screws, an anti-rotation pin key (56) is arranged between the valve rod (2) and the upper hoop sleeve and between the lower hoop sleeve, and one end of a rocker (51) is fixedly connected with one end of the lower hoop sleeve.

7. The adjustable eccentric butterfly valve according to any of claims 1 to 6, wherein: and a positioning pile (8) is fixedly arranged on the inner wall of the flow passage of the valve body (1).

8. The adjustable eccentric butterfly valve of claim 1, wherein: the connection face of butterfly plate (4) is equipped with end cover (9), and the week side of end cover (9) passes through a plurality of screw fastening connection with the week side of butterfly plate (4).

9. The adjustable eccentric butterfly valve of claim 1, wherein: the valve seat (3) and the butterfly plate (4) are made of tungsten carbide.