CN116906597A - Bidirectional metal-pressing sealing butterfly valve and use method thereof - Google Patents

Abstract

The application belongs to the technical field of valves, and particularly relates to a bidirectional metal seal butterfly valve and a use method thereof, wherein the bidirectional metal seal butterfly valve comprises the following steps: the valve body is internally provided with a flow passage; the butterfly plate is movably arranged in the valve body; the valve rod is arranged on the valve body and used for driving the butterfly plate to move, and a valve rod driving part is arranged at the top of the valve rod; further comprises: the metal sealing piece is of a gamma-shaped metal sealing structure; the valve body connected valve seat is formed by processing a body surfacing positive cone; the metal sealing piece is arranged along the circumferential direction of the butterfly plate, and the valve body conjoined valve seat can be matched with the metal sealing piece to form bidirectional sealing.

Description

Bidirectional metal-pressing sealing butterfly valve and use method thereof

Technical Field

The application belongs to the technical field of valves, and particularly relates to a bidirectional metal seal butterfly valve and a use method thereof.

Background

The butterfly valve is also called as a flap valve, is a regulating valve with a simple structure, and can be used for the on-off control of low-pressure pipeline media, wherein a closing member (a valve clack or a butterfly plate) is a disc, and rotates around a valve rod to realize opening and closing;

the valve can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like, and mainly has the functions of cutting off and throttling on a pipeline, and the butterfly valve opening and closing member is a disc-shaped butterfly plate which rotates around the axis of the butterfly valve in the valve body, so that the purpose of opening and closing or adjusting is achieved;

in the use process of the existing butterfly valve, the sealing element and the sealing surface of the valve seat are rubbed with each other in the opening and closing process, so that the abrasion phenomenon of the sealing surface is easy to occur in the frequent opening and closing process of the valve, and the sealing performance of the valve is further affected.

Disclosure of Invention

The application aims at solving the technical problems and provides a bidirectional metal-pressing sealing butterfly valve and a use method thereof, so as to reduce the abrasion of a sealing surface and improve the sealing effect of the butterfly valve.

In view of this, the present application provides a bi-directional metal seal butterfly valve, comprising:

the valve body is internally provided with a flow passage;

the butterfly plate is movably arranged in the valve body;

the valve rod is arranged on the valve body and used for driving the butterfly plate to move, and a valve rod driving part is arranged at the top of the valve rod;

further comprises:

the metal sealing piece is of a gamma-shaped metal sealing structure;

the valve body connected valve seat is formed by processing a body surfacing positive cone;

the valve body conjoined valve seat can be matched with the metal sealing element to form bidirectional sealing.

In the technical scheme, the metal sealing element with the 'gamma' -shaped metal sealing structure is matched with the valve body conjoined valve seat formed by processing the body overlaying positive cone, is suitable for bidirectional interception and regulation control of air, water, steam, various corrosive media, slurry, oil products, liquid nonmetal, radioactive media and other fluid flows, has small opening and closing resistance, reliably realizes that the butterfly valve positive and negative bidirectional pressure sealing meets the standard regulation requirement, and has cleaning function between the metal sealing ring with wiping performance and the valve body upper valve seat by the contact automatic anastomosis sealing action, so that particles, crystals, dirt, fibers and other impurities adhered on the sealing surface are scraped off very effectively.

In the technical scheme, further, the axis of the valve rod deviates from the center line of the valve body conjoined valve seat in the vertical direction, and the butterfly plate is a two-dimensional eccentric tortoiseshell type butterfly plate with the drift diameter more than or equal to 800.

In the above technical solution, further, the metal seal further includes:

the sealing ring is of a gamma shape, and can be subjected to surfacing welding STL or spray welding WC and nickel-based alloy;

the winding pad is high-temperature resistant, low-temperature resistant and corrosion resistant;

the adjusting sealing type pressing ring can be fixedly arranged on the butterfly plate through a circumferential screw and is provided with a pressing plate ring excircle for supporting the transverse extension end of the inverted L-shaped sealing ring;

the internal pressure cavity is positioned between the sealing ring and the adjusting sealing type pressing ring;

the sealing ring is arranged along the circumference of the butterfly plate, the winding pad is arranged between the sealing ring and the butterfly plate, and the sealing ring is fixed on the butterfly plate through an adjusting sealing type pressing ring.

In the above technical scheme, further, a combined packing box is arranged between the valve body and the valve rod, and the combined packing box can be a high-temperature combined packing box or an ultralow-temperature combined packing box which are used independently, or can be used together.

In the above technical scheme, further, the high-temperature combined packing box can be formed by combining a high Wen Yonggang base, a flexible graphite self-lubricating bearing, a chromium-nickel stainless steel packing pad, braided graphite and flexible graphite, and the high-temperature combined packing box can be tightly sealed through a packing gland pre-tightening device.

In the above technical scheme, further, the ultralow temperature combined packing box can be formed by combining a low Wen Yonggang base, a PTFE self-lubricating bearing, a lip type energy storage ring sealing ring (pctfe+inconel), a chrome-nickel stainless steel packing pad, braided graphite or PCTFE, and can be pre-tightened by combining a disc spring and a disc spring pad, and tightly sealed by a graphite ring pad and a packing gland.

In the above technical solution, further, the method further includes:

the buffer seat is movably provided with a buffer plate;

the elastic buffering reset pieces are provided with a plurality of buffering seats and are uniformly distributed between the buffering seats and the buffering plates;

the friction buffer pieces are provided with a plurality of friction buffer pieces and are uniformly distributed between the buffer seat and the buffer plate;

the composite reinforcing ribs are arranged on the surface of the buffer plate;

the buffer plate is vertically arranged and faces the direction of fluid entering the flow channel, and impact of the fluid on the butterfly plate is reduced through the elastic buffer reset piece and the friction buffer piece.

In the above technical solution, further, the elastic buffering reset piece further includes:

the base is arranged in the buffer seat, and the base is provided with an installation cavity;

the telescopic rod is arranged in the mounting cavity, and a reset spring is sleeved on the small-diameter section of the telescopic rod;

the through hole is arranged at the bottom of the side surface of the base and is used for communicating the mounting cavity with the outside;

the telescopic rod can be contracted and drives the reset spring to be contracted when the buffer plate is impacted by fluid.

In the above technical solution, further, the friction buffer further includes:

the outer shell is arranged in the buffer seat;

the inner shells are symmetrically arranged in the outer shell, and are cylindrical;

a rotating part rotatably installed in the inner housing, a plurality of movable friction plates being provided on a circumferential surface of the rotating part, the plurality of movable friction plates being spaced apart from each other;

the friction plate is fixedly arranged on the circumferential inner wall of the inner shell, a plurality of fixed friction plates are arranged on the surface of the friction plate, and the fixed friction plates are mutually arranged at intervals;

the variable friction structure is arranged on the rotating part, can be in friction contact with the friction plate, and the friction force between the variable friction structure and the friction plate can be changed along with the impact force received by the buffer plate;

the transmission structure is arranged in the outer shell and used for driving the rotating part to rotate when the buffer plate receives impact force;

wherein, a plurality of movable friction plates and a plurality of fixed friction plates are mutually staggered and spliced.

The application also discloses a use method suitable for the bidirectional metal seal butterfly valve, wherein in the process that the butterfly plate is closed by the valve rod, the sealing surface of the butterfly plate is eccentrically displaced along with two dimensions, and in the moving process, the sealing element of the butterfly plate 'gamma' is not in contact with the sealing surface of the valve body conjoined valve seat, and the butterfly plate is tightly contracted when the butterfly plate is closed to about 2 degrees at last moment, and is tightly contracted to form micro-ring elasticity to resist medium reflux pressure, so as to meet the requirements of positive and reverse sealing and form sealing;

the valve plate is contacted with the sealing action of automatic anastomosis, so that a cleaning effect is realized between the sealing ring with wiping performance and the valve body conjoined valve seat in the movement of the butterfly plate, and impurities such as particles, crystals, dirt, fibers and the like adhered on the sealing surface are effectively scraped;

meanwhile, the butterfly valve adopts two eccentric structures beta 1 (the angle between the central line of the valve rod and the central line of the flow channel) and beta 2, and the R point at the central point of the beta 1 eccentric shaft is used as a spherical loop to run for 90 degrees for opening and closing;

under long-term use, the valve body is connected with the valve seat or the sealing ring, and the sealing ring can be adjusted or replaced if the valve seat or the sealing ring is worn.

The beneficial effects of the application are as follows:

1. the metal sealing element with the 'gamma' -shaped metal sealing structure is matched with the valve body conjoined valve seat formed by processing the body surfacing positive cone, so that the sealing performance of the butterfly valve is effectively improved;

2. by adopting the two-dimensional eccentric tightening principle, the abrasion of the metal sealing piece in the using process is reduced, and the sealing effect of the butterfly plate is improved;

3. when the valve is used for a long time, the valve seat or the butterfly plate sealing ring of the valve body is worn, the sealing ring can be adjusted or replaced, meanwhile, the metal sealing piece with the same specification can realize unified allocation, tool guarantee is not needed during processing, boring is not needed during through shaft holes, and the body and the plate workpieces can be independently processed and completed in a single piece, so that the tool cost is saved, the production and processing difficulty is reduced, the production efficiency is improved, the maintenance and the maintenance are convenient, and the resources are saved;

4. the butterfly valve adopts an all-welded or flange connection mode, has a compact structure, is small in opening and closing moment due to a small eccentric design, has elasticity and is provided with a gamma-shaped sealing ring, and the butterfly valve can be installed on a pipe network at will through a radial dynamic balance sealing principle;

5. through the setting of buffer board and elasticity buffering return piece and friction cushioning piece, reduced the impact damage of fluid to the butterfly plate, improved the life of butterfly valve.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic structural diagram of an embodiment of the present application.

FIG. 2 is a schematic vertical sectional view of the valve body of the present application.

FIG. 3 is a schematic view of the metal seal structure of the present application.

FIG. 4 is a schematic view of a horizontal cross-sectional view of a valve body according to the present application.

FIG. 5 is a schematic view of a high temperature combined stuffing box according to the present application.

FIG. 6 is a schematic diagram of the ultralow temperature combined stuffing box structure of the present application.

Fig. 7 is a schematic structural diagram of embodiment 5 of the present application.

Fig. 8 is a schematic cross-sectional view of a buffer seat according to the present application.

FIG. 9 is a schematic view of the elastic buffer reset element of the present application.

FIG. 10 is a schematic view of a friction cushioning member according to the present application.

FIG. 11 is a schematic view of the structure of the composite reinforcing rib of the present application.

FIG. 12 is a schematic cross-sectional view of a composite reinforcing bar of the present application.

The label in the figure is:

1-valve body, 100-runner, 2-butterfly plate, 3-valve rod, 4-valve rod driving part, 5-metal sealing piece, 50-sealing ring, 51-winding gasket, 52-adjusting sealing type pressing ring, 520-pressing plate ring excircle, 53-ring Zhou Luoding, 54-internal pressure cavity, 6-valve body conjoined valve seat, 7-high temperature combined packing box, 8-ultralow temperature combined packing box, 9-buffer seat, 10-buffer plate, 11-elastic buffer reset piece, 110-base, 111-mounting cavity, 112-telescopic rod, 113-reset spring, 114-through hole, 12-friction buffer piece, 120-outer shell, 121-inner shell, 122-rotating part, 123-dynamic friction plate, 124-friction plate, 125-fixed friction plate, 13-compound reinforcing rib, 130-main reinforcing rib, 131-auxiliary reinforcing rib, 132-reinforcing panel, 133-T-shaped strip, 14-friction block, 15-balancing weight, 16-pretension spring, 17-friction surface, 18-connecting rod, 19-rack, 20-rotating shaft and 21-gear.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the description of the present application, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present application. For ease of description, the dimensions of the various features shown in the drawings are not drawn to actual scale. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Example 1:

the embodiment of the application provides a bidirectional metal seal butterfly valve, which comprises: a valve body 1, wherein a flow passage 100 is arranged in the valve body 1; the butterfly plate 2 is movably arranged in the valve body 1; the valve rod 3 is arranged on the valve body 1 and used for driving the butterfly 2 plate to move, and a valve rod driving part 4 is arranged at the top of the valve rod 3;

further comprises: the metal seal piece 5 is of a gamma-shaped metal seal structure; the valve body conjoined valve seat 6 is formed by processing a body surfacing positive cone;

wherein, the metal seal piece 5 sets up along the circumference of butterfly plate 2, and valve body disjunctor disk seat 6 can cooperate with metal seal piece 5 to form two-way seal.

Moreover, the valve body is a flange valve body or a butt welding valve body, the sealing surface of the valve body conjoined valve seat 6 can be arbitrarily selected to be in surfacing or spray welding with sealing surface materials 13Cr/STL/WC, the working temperature range of the butterfly valve is low temperature-196 ℃, high temperature +650 ℃, the pressure range is PN0.25 MPa-PN10.0 MPa, and the passthrough range is DN 80-DN 4000.

In the embodiment, the metal sealing element 5 with a 'gamma' -shaped metal sealing structure is matched with the valve body conjoined valve seat 6 formed by processing the body overlaying positive cone, and the butterfly valve is suitable for bidirectional interception and regulation control of air, water, steam, various corrosive media, slurry, oil products, liquid non-metal, radioactive media and other fluid circulation, the opening and closing resistance of the butterfly plate 2 is small, the butterfly valve positive and negative bidirectional pressure sealing is reliably realized to meet the standard regulation requirement, and the metal sealing ring 50 with wiping performance in the movement of the butterfly plate 2 and the valve seat on the valve body have cleaning action, so that the butterfly valve effectively scrapes off particles, crystals, dirt, fibers and other impurities adhered on the sealing surface.

Example 2:

the embodiment provides a two-way metal seal butterfly valve, which comprises the technical scheme of the embodiment and the following technical characteristics, wherein the axial lead of a valve rod 3 deviates from the central line of a valve body conjoined valve seat 6 in the vertical direction, and a butterfly plate 2 is a two-dimensional eccentric tortoiseshell type butterfly plate with the drift diameter more than or equal to 800.

In the embodiment, the sealing surface of the butterfly plate 2 is displaced along with the two-dimensional eccentricity by utilizing the two-dimensional eccentric tightening principle during valve closing, and is pressed to the sealing surface of the valve body conjoined valve seat 6 only at the last moment to form a micro elastic principle, so that the butterfly plate can be forcedly sealed, and the gamma-shaped metal sealing structure of the metal sealing piece 5 on the butterfly plate 2 is not contacted with the sealing surface of the valve body conjoined valve seat 6 in the closing or opening process, thereby eliminating the mutual friction between the sealing surfaces of the butterfly valve in the opening and closing processes, and preventing the phenomenon that the sealing surface is worn to influence the sealing effect due to frequent opening and closing of the butterfly valve.

Example 3:

the present embodiment provides a two-way metal seal butterfly valve, which has the following technical features in addition to the technical scheme including the above embodiment, and the metal seal 5 further includes: the sealing ring 50, the sealing ring 50 is 'gamma' -shaped, the sealing ring 50 can be subjected to surfacing welding STL or spray welding WC and nickel-based alloy; a winding pad 51, the winding pad 51 being a high temperature, low temperature and corrosion resistant winding pad; an adjusting seal type pressing ring 52, wherein the adjusting seal type pressing ring 52 can be fixedly arranged on the butterfly plate 2 through a ring Zhou Luoding 53, and the adjusting seal type pressing ring 52 is provided with a pressing plate ring outer circle 520 for supporting the transverse extending end of the inverted L-shaped sealing ring 50; an internal pressure cavity 54, the internal pressure cavity 54 being located between the seal ring 50 and the adjustment seal type press ring 52;

wherein, sealing washer 50 sets up along the circumference of butterfly plate 2, and winding pad 51 sets up between sealing washer 50 and butterfly plate 2, and sealing washer 50 is fixed on butterfly plate 2 through adjusting sealed clamping ring 52.

Moreover, the valve body conjoined valve seat 6 does not need a slope plate tool, the single body independently and uniformly processes the sizes of all parts, the butterfly plate 2 is manufactured and finished through a single piece of production line, and the valve body conjoined valve seat 6 is provided with a tight sealing section distance with a certain width size.

In this embodiment, valve body disjunctor disk seat 6, butterfly plate 2 and sealing washer 50 are convenient for production line operation, possess spare part interchangeability completely, make things convenient for this product spare part of same model specification to realize exchanging, manpower, material resources cost has been reduced, support sealing washer 50 internal diameter through clamp plate circle excircle 520, with reduce the compressive deformation, guarantee sealing washer 50 elastic effect, through setting up interior pressure cavity 54, interior pressure cavity 54 receives the outside tensile effort that the medium produced can assist sealing and then improve sealed effect, ring Zhou Luoding fastening sealing washer 50 can increase butterfly plate 2 bulk strength, sealing washer 50 cooperates and passes through tight seal section distance realization and closes more tightly more with valve body disjunctor disk seat 6, ensure two-way sealing function.

Example 4:

the embodiment provides a two-way metal seal butterfly valve, which has the following technical characteristics except the technical scheme of the embodiment, wherein a combined packing box is arranged between a valve body 1 and a valve rod 3, and the combined packing box can be a high-temperature combined packing box 7 or an ultralow-temperature combined packing box 8 which are independently used, and can also be a high-temperature combined packing box 7 and an ultralow-temperature combined packing box 8 which are jointly used.

The high-temperature combined packing box 7 can be formed by combining a high Wen Yonggang base, a flexible graphite self-lubricating bearing, a chromium-nickel stainless steel packing pad, braided graphite and flexible graphite, and the high-temperature combined packing box 7 can be tightly sealed through a packing gland pre-tightening device.

The ultralow-temperature combined packing box 8 can be formed by combining a low Wen Yonggang base, a PTFE self-lubricating bearing, a lip type energy storage ring sealing ring (PCTFE+lNCONEL), a chromium-nickel stainless steel packing pad, braided graphite or PCTFE, and the ultralow-temperature combined packing box 8 can be pre-tightened by combining a disc spring and a disc spring pad and is tightly sealed by the graphite ring pad and a packing gland.

In the embodiment, the high-temperature combined packing box is suitable for high-temperature media and corrosive media, the ultralow-temperature combined packing box is suitable for ultralow-temperature media, and the butterfly valve can be applied to different working conditions by selecting and applying the high-temperature combined packing box or the ultralow-temperature combined packing box, so that the universality of the butterfly valve is improved.

Example 5:

the embodiment provides a two-way metal seal butterfly valve, which comprises the technical scheme of the embodiment, the following technical characteristics, and further comprises: the buffer seat 9 is movably provided with a buffer plate 10; the elastic buffering reset pieces 11 are provided with a plurality of elastic buffering reset pieces 11 and are uniformly distributed between the buffering seat 9 and the buffering plate 10; the friction buffer pieces 12 are provided with a plurality of friction buffer pieces 12 and are uniformly distributed between the buffer seat and the buffer plate; composite reinforcing ribs 13, the composite reinforcing ribs 13 being provided on the surface of the buffer plate 10;

wherein, the buffer plate 10 is vertically arranged and faces the direction of fluid entering the flow channel, and the buffer plate 10 can reduce the impact of the fluid on the butterfly plate 2 through the elastic buffer reset piece 11 and the friction buffer piece 12.

Moreover, the buffer plate 10 is preferably made of a corrosion-resistant lightweight material, the composite reinforcing ribs 13 are provided with a plurality of reinforcing ribs and distributed on the surface of the buffer plate 10 in a cross shape, the composite reinforcing ribs 13 comprise main reinforcing ribs 130, auxiliary reinforcing ribs 131 and reinforcing panels 132, the main reinforcing ribs are made of the same material as the buffer plate 10, the main reinforcing ribs are fixedly connected with the surface of the buffer plate 10, a plurality of through holes 114 are formed in the main reinforcing ribs along the length direction, the auxiliary reinforcing ribs are in channel steel shapes and horizontally arranged in the main reinforcing ribs, the auxiliary reinforcing ribs extend along the length direction of the main reinforcing ribs, the auxiliary reinforcing ribs can be provided with a plurality of reinforcing ribs and are uniformly distributed in the main reinforcing ribs, the reinforcing panels are also in channel steel shapes and vertically arranged on the surface of one side of the main reinforcing ribs, and a plurality of T-shaped strips 133 are fixed on the surface of the reinforcing panels facing one side of the main reinforcing ribs, and the reinforcing panels are fixedly connected with the main reinforcing ribs through the T-shaped strips.

In this embodiment, through the setting of buffer board 10 and elasticity buffering reset piece 11 and friction buffer piece 12, the impact damage of fluid to butterfly plate 2 has been reduced, the life of butterfly valve has been improved, the buffer board 10 is preferably adopted corrosion-resistant light material to make simultaneously and can reduce the total quality of butterfly plate 2, thereby prevent that the speed of opening and close of butterfly plate 2 from receiving the influence, the structural strength of buffer board 10 can be guaranteed through the setting of compound strengthening rib 13, prevent that buffer board 10 from damaging because of fluid impact, compound strengthening rib 13 passes through the design of main strengthening rib, supplementary strengthening rib and reinforcing panel, the intensity of compound strengthening rib 13 can be improved when guaranteeing compound strengthening rib 13 light, thereby guarantee the reinforcing effect of compound strengthening rib 13 to buffer board 10 structural strength.

Example 6:

the present embodiment provides a two-way metal seal butterfly valve, which has the following technical features in addition to the technical scheme of the above embodiment, and the elastic buffering reset piece 11 further includes: the base 110, the base 110 is set up in the buffer seat 9, offer the installation cavity 111 on the base 110; the telescopic rod 112, the telescopic rod 112 is arranged in the installation cavity 111, and a reset spring 113 is sleeved on the small-diameter section of the telescopic rod 112; a through hole 114, the through hole 114 being provided at the bottom of the side of the base 110 and communicating the installation cavity 111 with the outside;

wherein, the expansion link 112 can be contracted and drive the return spring 113 to be contracted when the buffer plate 10 is impacted by fluid.

The friction cushioning member 12 further comprises: an outer case 120, the outer case 120 being disposed in the buffer seat 9; the inner shells 121, the inner shells 121 are two, the two inner shells 121 are symmetrically arranged in the outer shell 120, and the inner shells 121 are cylindrical; a rotating part 122 rotatably installed in the inner case 121, the rotating part 122 being provided on a circumferential surface of the rotating part 122 with a plurality of moving friction plates 123, the plurality of moving friction plates 123 being spaced apart from each other; the friction plate 124, the friction plate 124 is fixedly arranged on the circumferential inner wall of the inner shell 121, a plurality of fixed friction plates 125 are arranged on the surface of the friction plate 124, and the fixed friction plates 125 are mutually arranged at intervals; a variable friction structure disposed on the rotation part 122, the variable friction structure being in frictional contact with the friction plate 124 and a friction force between the variable friction structure and the friction plate 124 being variable according to the magnitude of the impact force received by the buffer plate 10; a transmission structure provided in the outer case 120 for driving the rotation part 122 to rotate when the buffer plate 10 receives an impact force;

wherein, a plurality of dynamic friction plates 123 and a plurality of fixed friction plates 125 are inserted in a staggered way.

The friction block 14 is movably installed in the hole, the section of the friction block 14 is T-shaped, a pre-tightening spring 16 is sleeved on the vertical part of the friction block 14, the outer end of the friction block 14 is provided with a friction surface 17 matched with the surface of a friction plate 124, the inner bottom surface of the hole is provided with a through hole penetrating to the circumferential surface of the rotation part 122, one end of the friction block 14 with the friction surface can penetrate through the through hole to be in friction contact with the surface of the friction plate 124, the left end of the weight 15 is fixedly connected with a connecting rod 18, the connecting rod 18 can be in rotary connection with the rotation part 122, the weight 15 can be influenced by centrifugal force to squeeze the friction block 14 when the rotation part 122 rotates, the transmission structure comprises a rack 19 and a rotary shaft 20 connected with the center of the rotation part 122, the right end of the rotary shaft 20 penetrates out of an inner shell 121 and is concentrically provided with a gear 21, the rack 19 is movably installed on the outer shell 120, one end of the rack 19 is connected with the buffer plate 10, the rack 19 can move along with the movement of the buffer plate 10, the rack 19 can be meshed with the gear 21, and the rack 19 can be sealed with the outer shell 120 by adopting an oil seal.

In this embodiment, when the butterfly plate 2 is impacted by conventional fluid, the buffer plate 10 moves towards the butterfly plate 2 after being impacted, the telescopic rod 112 moves along with the buffer plate 10 to shrink and drives the return spring 113 to shrink, at this time, the impact is buffered by the elastic force generated by deformation of the return spring 113, and as the medium can be filled in the mounting cavity 111, when the telescopic rod 112 shrinks, the medium in the mounting cavity 111 is extruded to be discharged by the through hole 114, thereby forming hydraulic buffer to buffer the impact force again, simultaneously, the rack 19 moves and drives the gear 21 to rotate along with the movement of the buffer plate 10, the rotating shaft 20 rotates along with the rotation of the gear 21 to drive the rotating part 122 to rotate, the rotating part 122 rotates to enable the relative movement between the movable friction plate 123 and the fixed friction plate 125, so as to convert the impact force into heat energy through friction, further reduce the impact force to the influence of the butterfly plate 2, after the impact force is dissipated, the return spring 113 can slowly reset the buffer plate 10 to the lower impact, when the butterfly plate 2 is impacted by a large amount of unconventional impact, the buffer plate 10 moves rapidly, the gear 19 moves rapidly, and drives the gear 21 and drives the rotating part 21 to rotate along with the rotation of the gear 19, thereby the friction plate 14 rotates along with the rotation of the friction plate 14, the friction plate 14 is further reduced, thereby the friction plate 16 is damaged, the friction plate 16 is greatly, the friction plate is greatly damaged, the friction plate is reduced, the friction plate is further damaged, the friction plate is greatly rotates, and the friction plate is reduced, compared with the friction plate is damaged, and the friction plate is compared with the friction plate 16, and the friction plate is greatly rotates, and the friction plate is greatly damaged, the service life of the butterfly valve is prolonged.

Example 7:

the embodiment provides a use method of a bidirectional metal-compression sealing butterfly valve, which comprises the following technical scheme, and has the following technical characteristics that in the process of driving and closing a butterfly plate 2 through a valve rod 3, the sealing surface of the butterfly plate 2 moves eccentrically along with two dimensions, the 'gamma' -shaped metal sealing structure of a metal sealing piece 5 of the butterfly plate 2 does not contact with the sealing surface of a valve body conjoined valve seat 6 in the moving process, and the butterfly plate 2 starts to be tightly contracted when the butterfly plate 2 is closed to about the last 2 ℃ at the last moment, and is tightly closed to form micro-ring shrinkage elasticity to resist medium reflux pressure so as to meet the requirements of positive and reverse sealing and form sealing;

the butterfly plate 2 is contacted with the sealing action of automatic anastomosis, so that a cleaning effect is realized between the sealing ring 50 with wiping performance and the valve body conjoined valve seat 6 in the movement of the butterfly plate 2, and impurities such as particles, crystals, dirt, fibers and the like adhered on the sealing surface are effectively scraped;

meanwhile, the butterfly valve adopts the angle between the central line of the beta 1 valve rod of the two eccentric structures and the central line of the flow channel and beta 2, and the R point of the center of the beta 1 eccentric shaft is used as a spherical loop to run for 90 degrees for opening and closing;

the valve body and the valve seat 6 or the sealing ring 50 are worn, and the sealing ring 50 can be adjusted or replaced under long-term use.

In this embodiment, the sealed face of butterfly valve receives the wearing and tearing low at the in-process of opening and close, is difficult to appear sealed phenomenon of inefficacy, has improved the life of butterfly valve to improved the sealed effect of butterfly valve, the butterfly valve can carry out two-way seal, and the butterfly valve is little eccentric, moment is little, can two-way seal in opening and close the in-process, is fit for each field and uses.

The embodiments of the present application have been described above with reference to the accompanying drawings, in which the embodiments of the present application and features of the embodiments may be combined with each other without conflict, the present application is not limited to the above-described embodiments, which are merely illustrative, not restrictive, of the present application, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are protected by the present application.

Claims (10)

1. A bi-directional metal seal butterfly valve comprising:

the valve comprises a valve body (1), wherein a flow passage (100) is arranged in the valve body (1);

the butterfly plate (2) is movably arranged in the valve body (1);

the valve rod (3) is arranged on the valve body (1) and used for driving the butterfly (2) plate to move, and a valve rod driving part (4) is arranged at the top of the valve rod (3);

characterized by further comprising:

a metal seal (5), wherein the metal seal (5) is of a 'gamma' -shaped metal seal structure;

the valve body connected valve seat (6), the valve body connected valve seat (6) is formed by processing a body build-up welding positive cone;

the metal sealing piece (5) is arranged along the circumferential direction of the butterfly plate (2), and the valve body conjoined valve seat (6) can be matched with the metal sealing piece (5) to form bidirectional sealing.

2. The bi-directional metal seal butterfly valve of claim 1, wherein: the axial lead of the valve rod (3) deviates from the central line of the valve body conjoined valve seat (6) in the vertical direction, and the butterfly plate (2) is a two-dimensional eccentric tortoiseshell type butterfly plate with the drift diameter more than or equal to 800.

3. A bi-directional metal seal butterfly valve according to claim 2, wherein said metal seal (5) further comprises:

the sealing ring (50), the sealing ring (50) is 'gamma' -shaped, the sealing ring (50) can be subjected to surfacing STL or spray welding WC and nickel-based alloy;

a winding pad (51), wherein the winding pad (51) is a high-temperature, low-temperature and corrosion-resistant winding pad;

an adjusting seal type pressing ring (52), wherein the adjusting seal type pressing ring (52) can be fixedly arranged on the butterfly plate (2) through a ring Zhou Luoding (53), and the adjusting seal type pressing ring (52) is provided with a pressing plate ring outer circle (520) for supporting the transverse extending end of the gamma-shaped sealing ring (50);

an internal pressure cavity (54), wherein the internal pressure cavity (54) is positioned between the sealing ring (50) and the adjusting sealing type pressing ring (52);

the butterfly plate comprises a butterfly plate (2), a sealing ring (50) and a winding pad (51), wherein the sealing ring (50) is arranged along the circumference of the butterfly plate (2), the winding pad (51) is arranged between the sealing ring (50) and the butterfly plate (2), and the sealing ring (50) is fixed on the butterfly plate (2) through an adjusting sealing type pressing ring (52).

4. The bi-directional metal seal butterfly valve of claim 1, wherein: the combined packing box is arranged between the valve body (1) and the valve rod (3), and can be a high-temperature combined packing box (7) or an ultralow-temperature combined packing box (8) which are used independently or can be used together by the high-temperature combined packing box (7) and the ultralow-temperature combined packing box (8).

5. The bi-directional metal seal butterfly valve of claim 4, wherein: the high-temperature combined packing box (7) can be formed by combining a high Wen Yonggang base, a flexible graphite self-lubricating bearing, a chromium-nickel stainless steel packing pad, braided graphite and flexible graphite, and the high-temperature combined packing box (7) can be tightly sealed through a packing gland pre-tightening device.

6. The bi-directional metal seal butterfly valve of claim 4, wherein: the ultralow temperature combined packing box (8) can be formed by combining a low Wen Yonggang base, a PTFE self-lubricating bearing, a lip type energy storage ring sealing ring (PCTFE+lNCONEL), a chromium-nickel stainless steel packing pad, braided graphite or (PCTFE), and the ultralow temperature combined packing box (8) can be pre-tightened by combining a disc spring and a disc spring pad and is tightly sealed by a graphite ring pad and a packing gland.

7. The bi-directional metal seal butterfly valve of claim 1, further comprising:

the buffer seat (9), the activity is provided with buffer plate (10) on the said buffer seat (9);

the elastic buffering reset pieces (11) are provided with a plurality of elastic buffering reset pieces (11) and are uniformly distributed between the buffering seat (9) and the buffering plate (10);

the friction cushioning members (12) are provided with a plurality of friction cushioning members (12) and are uniformly distributed between the cushioning seat and the cushioning plate;

the composite reinforcing ribs (13) are arranged on the surface of the buffer plate (10);

the buffer plate (10) is vertically arranged and faces the direction of fluid entering the flow channel, and the buffer plate (10) can reduce impact of the fluid on the butterfly plate (2) through the elastic buffer reset piece (11) and the friction buffer piece (12).

8. The bi-directional metal seal butterfly valve of claim 7, wherein the resilient buffer reset member (11) further comprises:

the base (110) is arranged in the buffer seat (9), and the base (110) is provided with an installation cavity (111);

the telescopic rod (112) is arranged in the mounting cavity (111), and a reset spring (113) is sleeved on the small-diameter section of the telescopic rod (112);

a through hole (114), the through hole (114) being provided at the bottom of the side surface of the base (110) and communicating the installation cavity (111) with the outside;

the telescopic rod (112) can be contracted when the buffer plate (10) is impacted by fluid, and the reset spring (113) is driven to be contracted.

9. The bi-directional metal seal butterfly valve of claim 7, wherein the friction cushioning member (12) further comprises:

an outer housing (120), the outer housing (120) being arranged in the buffer seat (9);

the inner shell (121), the inner shell (121) is provided with two inner shells (121) which are symmetrically arranged in the outer shell (120), and the inner shells (121) are cylindrical;

a rotating part (122), wherein the rotating part (122) is rotatably installed in the inner shell (121), a plurality of dynamic friction plates (123) are arranged on the circumferential surface of the rotating part (122), and the dynamic friction plates (123) are mutually arranged at intervals;

the friction plate (124) is fixedly arranged on the circumferential inner wall of the inner shell (121), a plurality of fixed friction plates (125) are arranged on the surface of the friction plate (124), and the fixed friction plates (125) are mutually arranged at intervals;

a variable friction structure provided on the rotating part (122), the variable friction structure being in frictional contact with the friction plate (124) and a frictional force between the variable friction structure and the friction plate (124) being variable depending on the magnitude of an impact force received by the buffer plate (10);

the transmission structure is arranged in the outer shell (120) and used for driving the rotating part (122) to rotate when the buffer plate (10) receives impact force;

the movable friction plates (123) and the fixed friction plates (125) are mutually staggered and spliced, and the outer shell (120) is a sealed shell.

10. A method for using the bi-directional metal seal butterfly valve of claim 6, wherein:

in the process that the butterfly plate (2) is closed by the valve rod (3), the sealing surface of the butterfly plate (2) moves eccentrically along with two dimensions, the 'gamma' -shaped metal sealing structure of the metal sealing piece (5) of the butterfly plate (2) is not in contact with the sealing surface of the valve body conjoined valve seat (6) in the moving process, and the butterfly plate (2) starts to be tightly contracted when the butterfly plate (2) is closed to about 2 degrees at last moment, and is tightly closed more, so that micro-ring shrinkage elasticity is formed to resist medium reflux pressure, and the positive and negative sealing requirements are met to form sealing;

the butterfly plate (2) is automatically contacted and matched with the sealing action, so that a cleaning effect is provided between the sealing ring (50) with wiping performance and the valve body conjoined valve seat (6) in the movement of the butterfly plate (2), and impurities such as particles, crystals, dirt, fibers and the like adhered on the sealing surface are effectively scraped;

meanwhile, the butterfly valve adopts two eccentric structures beta 1 (the angle between the central line of the valve rod and the central line of the flow channel) and beta 2, and the R point at the central point of the beta 1 eccentric shaft is used as a spherical loop to run for 90 degrees for opening and closing;

the valve body and the valve seat (6) or the sealing ring (50) are worn for a long time, and the sealing ring (50) can be adjusted or replaced.