CN109899534B

CN109899534B - Butterfly valve

Info

Publication number: CN109899534B
Application number: CN201910270255.2A
Authority: CN
Inventors: 林权武
Original assignee: Hangzhou Lansheng Valve Co ltd
Current assignee: Zhejiang Lansheng Intelligent Equipment Co.,Ltd.
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2020-06-02
Anticipated expiration: 2039-04-04
Also published as: CN109899534A

Abstract

The invention provides a butterfly valve, and belongs to the technical field of valves. It is hard that it has solved current butterfly valve operation, the lower problem of life. This butterfly valve, including valve body and valve rod, the valve rod is along radially rotating to wear to establish in the valve body, the valve clack has on the valve rod, annular pressure tank has been seted up to circumference on the outer peripheral face of valve clack, the circumference is equipped with the rubber circle in the pressure tank, and rubber circle protrusion pressure tank notch, the inlet opening has been seted up to the valve rod in one side of valve clack, the pressure release hole has been seted up at the opposite side of valve clack, the inlet opening all communicates with the pressure tank with the pressure release hole, and the one end of water inlet towards the valve body when the valve clack is closed, the one end that the pressure release hole goes out water towards the valve body, still be equipped with the shutoff piece that can block up the pressure release hole when the valve clack is closed in the. The butterfly valve is more labor-saving to operate and has a longer service life.

Description

Butterfly valve

Technical Field

The invention belongs to the technical field of valves and relates to a butterfly valve.

Background

The butterfly valve is also called a flap valve, is a regulating valve with a relatively simple structure, can be used for controlling the opening and closing of a pipeline medium, the closing member of the butterfly valve is a disc and rotates around a valve shaft to open and close, the butterfly valve mainly plays the roles of cutting and throttling on the pipeline, the edge of the disc-shaped valve clack is abutted against the inner wall of the valve body to form sealing, the butterfly valve and the valve body are usually hard sealing, but the sealing effect of hard sealing gradually becomes worse along with the abrasion in the using process, for this reason, a circle of rubber sealing element is fixed at the outer edge of the valve clack of some butterfly valves, the sealing is realized through the tight fit between the rubber sealing element and the inner wall of the valve body, in order to ensure the sealing effect, the pressing force between the rubber sealing element and the valve body is larger, but the opening and closing resistance of the valve clack is large, the operation is laborious, and the rubber sealing element is abraded, deformed and aged due to the larger pressing force, and the service life is shorter.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a butterfly valve which is labor-saving in operation and long in service life.

The purpose of the invention can be realized by the following technical scheme: the utility model provides a butterfly valve, includes the valve body and the valve rod of tube-shape, the valve rod is worn to establish in the valve body along radially rotating, and the one end of valve rod stretches out the valve body, the discoid valve clack has on the valve rod, its characterized in that, annular pressure tank has been seted up to circumference on the outer peripheral face of valve clack, the inner circumference of pressure tank is equipped with the rubber circle, and rubber circle protrusion pressure tank notch, the inlet opening has been seted up to the valve rod in one side of valve clack, has seted up the pressure release hole at the opposite side of valve clack, the inlet opening all communicates with the pressure tank with the pressure release hole, and when the valve clack is closed the water inlet towards the one end that the valve body intake, the one end that the pressure release hole goes out water towards the valve body still is equipped with the shutoff piece that can block up the pressure release hole when the valve.

When the butterfly valve is in a closed state, the pressure relief hole is blocked by the blocking piece, the water inlet hole is communicated with the water inlet end at the moment, water at the water inlet end enters the pressure groove through the water inlet hole and acts on the rubber ring, namely, the rubber ring is tightly pressed on the inner wall of the valve body through the water pressure at the water inlet end, so that the sealing between the valve clack and the valve body is realized, when the butterfly valve needs to be opened, the water inlet hole is blocked by the blocking piece through the operating mechanism, the pressure relief hole is opened simultaneously, at the moment, the water pressure in the pressure groove is released, the rubber ring loses the pressing force between the rubber ring and the valve body, the valve clack is more labor-saving in rotating, and the pressing force between the rubber ring and the valve body is smaller in rotation, so that the abrasion, the deformation and.

In foretell butterfly valve, the rubber circle is hollow structure, and the transversal D font of personally submitting of rubber circle, the rubber circle is including the sealing that is arc protrusion pressure tank notch and the supporting part that covers the sealing inner chamber, the intercommunicating pore of a plurality of intercommunication sealing inner chambers and pressure tank is seted up to circumference on the supporting part, annular seal groove has been seted up to circumference on the inner wall of valve body, and the transversal arc of personally submitting of seal groove works as the outer peripheral face laminating that the upper seal portion was closed to the valve clack compresses tightly in the seal groove. When the valve clack is closed, water in the pressure groove can enter the inner cavity of the sealing part through the communicating hole and act on the inner side face of the sealing part, so that the outer side face of the sealing part is attached to the wall of the sealing groove and tightly pressed, a good sealing effect is achieved, the inner cavity of the sealing part can be extruded by the water under the action of the inner wall of the valve body when the butterfly valve is opened, meanwhile, the radial shrinkage deformation is avoided, and the influence on the service life caused by hard extrusion between the sealing part and the valve body is avoided.

In foretell butterfly valve, the thickness of sealing is diminished to both sides by the middle part along width direction gradually, the both sides of the equal protrusion sealing in both sides of supporting part border form annular connection protruding edge, annular concave shoulder has on the both sides cell wall of pressure tank, it is protruding along supporting and pressing from both sides concave shoulder and compressing tightly fixedly through the clamping ring to connect, the clearance has between the bottom surface of supporting part and pressure tank. The middle part of the sealing part has certain strength, the thin position of the sealing part deforms when the butterfly valve is opened, the sealing part integrally moves inwards, and the gap between the supporting part and the pressure groove is used for the integral inward radial deformation of the rubber ring.

In foretell butterfly valve, the inlet opening all is located the central point of valve clack with the pressure release hole and puts, a plurality of water holes of crossing have been seted up to the valve clack internal circumferencial, and the length direction who crosses the water hole sets up along the valve clack is radial, and is a plurality of the one end of crossing the water hole all communicates with inlet opening and pressure release hole, and the other end all communicates with the pressure tank mutually. The water at the water inlet end enters the pressure tank through the water inlet hole and the water through hole and then enters the rubber ring through the communicating hole.

In foretell butterfly valve, valve rod and valve clack formula structure as an organic whole all set up the hole of stepping down that suits with the rubber circle at the both ends of valve rod, the rubber circle passes two holes of stepping down respectively. Through the hole of stepping down for the rubber circle is the annular, and the wholeness is better, and then heightens the stability and the sealed effect of rubber circle.

In foretell butterfly valve, set up the columnar installation cavity in the valve rod, above-mentioned inlet opening and pressure release hole all are linked together with the installation cavity, the shutoff piece is including the shutoff board one and the shutoff board two that link firmly mutually, the cross section of shutoff board one and shutoff board two all is the arc, and shutoff board one and shutoff board two all paste and lean on the installation intracavity wall, the convex surface of shutoff board one is towards one side of pressure release hole, and the convex surface of shutoff board two is towards one side of inlet opening, and shutoff board two is higher than shutoff board one, still be equipped with the spring in the installation cavity, the lower extreme of this spring is used in the installation cavity bottom surface, and the upper end is used in on shutoff board one and shutoff board two, and the pressure release hole is plugged up to shutoff board one under the effect of spring, and shutoff board two is higher than the inlet opening. The first plugging plate and the second plugging plate overcome the elastic force of the spring and descend through the operating mechanism when the butterfly valve needs to be opened, the first plugging plate moves to the lower part of the pressure relief hole, the pressure relief hole is opened, and the second plugging plate plugs the water inlet hole.

In foretell butterfly valve, set up flutedly on the convex surface of shutoff board one, it is provided with sealed piece to slide in the recess, and sealed piece has the sealed cambered surface of protrusion recess and with the installation cavity medial surface phase adaptation, have the clearance between sealed piece and the grooved underside, and set up the limbers that is linked together with the installation cavity on the bottom surface of recess, when shutoff board one can block up the pressure release hole with the relative time sealed piece of pressure release hole. When the butterfly valve is in the closure, the inlet opening is opened, has higher water pressure in the installation cavity, and the water in the installation cavity can get into in the recess of shutoff board one through the limbers simultaneously for have the same water pressure in the recess, consequently sealed piece can compress tightly on the installation intracavity wall under the water pressure effect, improves the sealed of pressure release hole, avoids pressure release hole department to appear the phenomenon of leaking.

In foretell butterfly valve, the shutoff piece still includes the traveller, and this traveller sets up in the installation cavity along endwise slip, shutoff board one and shutoff board two are all fixed on the traveller through the connecting rod, have the stop collar at the lower extreme of traveller, and the upper end of above-mentioned spring supports and leans on in the stop collar, the upper end of traveller is fixed with down the pressure disk, operating mechanism can press down the pressure disk downwards and make the pressure release hole open. The first plugging plate and the second plugging plate are in sliding connection through the sliding columns, so that the structure is more stable.

In foretell butterfly valve, operating mechanism hinges the upper end at the valve rod including the handle that is used for rotating the valve rod, and the free end of handle can the luffing motion, the mounting hole has been seted up to the upper end of valve rod, the installation hole is stretched out to the slip column that slides in the mounting hole, the mounting hole is stretched out to the upper end that should press the post, the lower extreme that presses the post passes through the transfer line and is connected with the traveller transmission, and can make the shutoff board open pressure release hole and two shutoff inlet openings of shutoff board when pressing the post to descend, the tip of handle has presses the splenium, should press the splenium to be located the top of pressing the post, works as the handle is pressed the splenium and can be pressed down the pressure. All need rotate the valve rod through the handle when needs open or close the butterfly valve, and lift the handle earlier before rotating, make the pressing part press the compression leg down, press the post and press the sliding column through the transfer line down, make the pressure release hole open, the inlet opening is closed, thereby all can not receive hydraulic effect opening and closing in-process sealing, release handle after the butterfly valve is closed, the spring can upwards push up the sliding column, make the pressure release hole close, the inlet opening is opened, of course the manipulation section of handle is usually longer, can be in self action of gravity down the swing, make the pressing part release press the compression leg.

In the butterfly valve, the valve rod is internally provided with guide holes along the axial direction, the two guide holes are positioned at the two sides of the abdicating hole, the two transmission rods are slidably arranged in the two guide holes, the upper ends of the two transmission rods are fixedly connected with the pressing column, the lower ends of the two transmission rods extend out of the guide holes, an upper pressure plate is fixed between the lower ends of the two transmission rods, a columnar rubber block is fixed in the installation cavity, the outer peripheral surface of the rubber block is in tight fit with the inner peripheral surface of the mounting cavity, the rubber block is positioned above the water inlet hole and the pressure relief hole, a plurality of through holes are axially arranged on the rubber block, a plurality of top columns are vertically and fixedly connected on the upper side surface of the lower pressing disc, and a plurality of fore-props pass a plurality of through holes respectively, the downside of going up the pressure disk supports and leans on the upper end at a plurality of fore-props, the fore-prop and the rubber block tight fit. Two guiding holes set up along the valve rod axial, and the hole of stepping down roughly sets up along the valve rod radially, two guiding holes are located the hole both sides of stepping down, both can not take place to interfere, wherein the rubber block is used for sealed to two guiding holes, fore-set and through hole tight fit simultaneously, consequently, can avoid water to leak from the guiding hole, the rubber block can carry out circumference location to the traveller through the fore-set simultaneously, can push down the fore-set through two transfer lines and last pressure disk when pressing the post down, the pressure disk is pushed down under the fore-set, thereby realize the removal of traveller.

Compared with the prior art, the butterfly valve has the following advantages:

1. because the rubber circle compresses tightly on the valve body inner wall through the water pressure effect, thereby realize the sealed between valve clack and the valve body, make the shutoff piece shutoff plug up the inlet opening through operating mechanism when the butterfly valve is opened to needs, open the pressure release hole simultaneously, the water pressure in the pressure tank is released this moment, the rubber circle loses and the valve body between the packing force, consequently, it is more laborsaving to rotate the valve clack, and because the packing force between rubber circle and the valve body is less when rotating, consequently, the wearing and tearing of rubber circle, deformation etc. are less, can improve the life of rubber circle, and then improve the life of whole butterfly valve.

2. Because the rubber circle is hollow structure, water pressure makes sealing portion lateral surface and seal groove cell wall laminate mutually and compresses tightly, has better sealed effect, and the sealing portion can extrude the inner chamber with water under the effect of valve body inner wall when opening the butterfly valve, radial contraction deformation simultaneously, avoid and the valve body between produce hard extrusion and influence life.

3. Because the water in the installation cavity can enter the groove of the first plugging plate through the limber hole, the same water pressure is kept in the groove, the sealing block can be tightly pressed on the inner wall of the installation cavity under the action of the water pressure, the sealing of the pressure relief hole is improved, and the water leakage phenomenon at the position of the pressure relief hole is avoided.

4. Because the opening and closing of the pressure relief hole and the water inlet hole are operated through the handle and are lifted up before the valve rod is rotated, no additional operation part is needed, and the operation continuity is better.

Drawings

Fig. 1 is a schematic perspective view of a butterfly valve.

Fig. 2 is a structural side view of the butterfly valve.

3 fig. 3 3 3 is 3 a 3 sectional 3 view 3 of 3 the 3 structure 3 at 3 a 3- 3 a 3 in 3 fig. 32 3. 3

Fig. 4 is an enlarged view of the structure at B in fig. 3.

Fig. 5 is a structural plan view of the butterfly valve.

Fig. 6 is a cross-sectional view of the structure at C-C in fig. 5.

Fig. 7 is a schematic perspective view of the valve flap.

Fig. 8 is an enlarged view of the structure at D in fig. 6.

Fig. 9 is a cross-sectional view of the structure at E-E in fig. 2.

Fig. 10 is an enlarged view of the structure at F in fig. 9.

Fig. 11 is an enlarged view of the structure at G in fig. 3.

In the figure, 1, a valve body; 11. a sealing groove; 12. a water inlet end; 13. a water outlet end; 2. a valve stem; 21. a water inlet hole; 22. a pressure relief vent; 23. a mounting cavity; 24. a hole of abdication; 25. mounting holes; 26. a guide hole; 3. a valve flap; 31. a pressure tank; 311. a concave shoulder; 312. pressing a ring; 32. water passing holes; 4. a rubber ring; 41. a sealing part; 42. a support portion; 421. a communicating hole; 43. connecting the convex edges; 5. a traveler; 51. a connecting rod; 52. a first plugging plate; 521. a groove; 522. a water through hole; 523. a sealing block; 524. sealing the arc surface; 53. a second plugging plate; 54. a limiting sleeve; 55. a lower platen; 56. a top pillar; 6. a handle; 61. a pressing part; 7. pressing the column; 71. a transmission rod; 72. an upper platen; 8. a rubber block; 81. a through hole; 9. a spring.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2 and 3, a butterfly valve comprises a cylindrical valve body 1 and a valve rod 2, wherein the valve rod 2 is radially and rotatably arranged in the valve body 1 in a penetrating way, one end of the valve rod 2 extends out of the valve body 1, the valve rod 2 is provided with a disc-shaped valve clack 3, the peripheral surface of the valve clack 3 is circumferentially provided with an annular pressure groove 31, the inner circumference of the pressure groove 31 is provided with a rubber ring 4, the rubber ring 4 protrudes out of the notch of the pressure groove 31, the valve rod 2 is provided with a water inlet 21 at one side of the valve clack 3, the other side of the valve clack 3 is provided with a pressure relief hole 22, the water inlet hole 21 and the pressure relief hole 22 are both communicated with the pressure groove 31, when the valve clack 3 is closed, the water inlet faces to the water inlet end of the valve body 1, the pressure relief hole 22 faces to the water outlet end of the valve body 1, a plugging piece capable of plugging the pressure relief hole 22 when the valve clack 3 is closed is further arranged in the valve clack 3, and an operating mechanism capable of enabling the plugging piece to open the pressure relief hole 22 and plug the water inlet hole 21 is arranged on the valve rod 2. When the butterfly valve is in a closed state, the pressure relief hole 22 is blocked by the blocking piece, at the moment, the water inlet hole 21 is communicated with the water inlet end 12, water at the water inlet end 12 enters the pressure groove 31 through the water inlet hole 21 and acts on the rubber ring 4, namely, the rubber ring 4 is compressed on the inner wall of the valve body 1 through the water pressure of the water inlet end 12, so that sealing between the valve clack 3 and the valve body 1 is realized, when the butterfly valve needs to be opened, the water inlet hole 21 is blocked by the blocking piece through the operating mechanism, the pressure relief hole 22 is opened at the same time, at the moment, the water pressure in the pressure groove 31 is released, the rubber ring 4 loses the pressing force between the rubber ring and the valve body 1, so that the valve clack 3 is more labor-saving to rotate, and the pressing force between the rubber ring 4 and the valve body 1 is smaller during rotation, so that the abrasion, the.

Specifically, as shown in fig. 4, the rubber ring 4 is a hollow structure, the cross section of the rubber ring 4 is D-shaped, the rubber ring 4 includes a sealing portion 41 protruding out of the notch of the pressure groove 31 in an arc shape and a supporting portion 42 covering the inner cavity of the sealing portion 41, the supporting portion 42 is circumferentially provided with a plurality of communicating holes 421 communicating the inner cavity of the sealing portion 41 with the pressure groove 31, the inner wall of the valve body 1 is circumferentially provided with an annular sealing groove 11, the cross section of the sealing groove 11 is arc-shaped, when the valve flap 3 closes, the outer circumferential surface of the upper sealing portion 41 is attached and pressed in the sealing groove 11, when the valve flap 3 is closed, water in the pressure groove 31 can enter the inner cavity of the sealing portion 41 through the communicating holes 421 and act on the inner side surface of the sealing portion 41, so that the outer side surface of the sealing portion 41 is attached and pressed against the groove wall of the sealing groove 11, thereby providing a good sealing, meanwhile, the radial shrinkage deformation avoids the hard extrusion between the valve body 1 and the valve body to influence the service life. The thickness of sealing 41 diminishes to both sides by the middle part along width direction gradually, the both sides border of supporting part 42 all protrudes the both sides of sealing 41 and forms annular connection protruding edge 43, annular concave shoulder 311 has on the both sides cell wall of pressure tank 31, it leans on concave shoulder 311 and compresses tightly fixedly through clamping ring 312 to connect protruding edge 43, the clearance has between the bottom surface of supporting part 42 and pressure tank 31, make the middle part of sealing 41 have certain intensity, the thinner position deformation of sealing 41 when opening the butterfly valve, make the whole inward movement of sealing 41, the clearance between supporting part 42 and the pressure tank 31 is used for the whole radial deformation of inside of rubber circle 4. Referring to fig. 5 and 6, the water inlet hole 21 and the pressure relief hole 22 are both located at the center of the valve flap 3, a plurality of water through holes 32 are circumferentially formed in the valve flap 3, the length direction of the water through holes 32 is radially arranged along the valve flap 3, one ends of the water through holes 32 are communicated with the water inlet hole 21 and the pressure relief hole 22, and the other ends of the water through holes 32 are communicated with the pressure groove 31. Water at the water inlet end 12 enters the pressure groove 31 through the water inlet hole 21 and the water through hole 32 and then enters the rubber ring 4 through the communication hole 421. Combine fig. 7, fig. 8 to show, valve rod 2 and valve clack 3 formula structure as an organic whole all set up the hole 24 of stepping down that suits with rubber circle 4 at the both ends of valve rod 2, and rubber circle 4 passes two holes 24 of stepping down respectively, through the hole 24 of stepping down for rubber circle 4 is the annular, and the wholeness is better, and then heightens rubber circle 4's stability and sealed effect.

Referring to fig. 9, 10 and 11, a columnar mounting cavity 23 is formed in the valve rod 2, the water inlet hole 21 and the pressure relief hole 22 are both communicated with the mounting cavity 23, the plugging piece comprises a first plugging plate 52 and a second plugging plate 53 which are fixedly connected, the cross sections of the first plugging plate 52 and the second plugging plate 53 are both arc-shaped, the first plugging plate 52 and the second plugging plate 53 are both attached to the inner wall of the mounting cavity 23, the convex surface of the first plugging plate 52 faces one side of the pressure relief hole 22, the convex surface of the second plugging plate 53 faces one side of the water inlet hole 21, the second plugging plate 53 is higher than the first plugging plate 52, a spring 9 is further arranged in the mounting cavity 23, the lower end of the spring 9 acts on the bottom surface of the mounting cavity 23, the upper end acts on the first plugging plate 52 and the second plugging plate 53, the first plugging plate 52 plugs the pressure relief hole 22 under the action of the spring 9, the second plugging plate 53 is higher than the water inlet hole 21, the first plugging plate 52 plugs the pressure relief hole 22 under the action of the spring, at the moment, the second plugging plate 53 is higher than the water inlet 21, the water inlet 21 is opened, when the butterfly valve needs to be opened, the first plugging plate 52 and the second plugging plate 53 fall by overcoming the elastic force of the spring 9 through the operating mechanism, the first plugging plate 52 moves to the position below the pressure relief hole 22, the pressure relief hole 22 is opened, and the second plugging plate 53 plugs the water inlet 21. A groove 521 is formed on the convex surface of the first plugging plate 52, a sealing block 523 is arranged in the groove 521 in a sliding manner, the sealing block 523 is provided with a sealing cambered surface 524 which protrudes out of the groove 521 and is matched with the inner side surface of the mounting cavity 23, a gap is reserved between the sealing block 523 and the bottom surface of the groove 521, and the bottom surface of the groove 521 is provided with a water through hole 522 communicated with the mounting cavity 23, the sealing block 523 can seal the pressure relief hole 22 when the first blocking plate 52 is opposite to the pressure relief hole 22, when the butterfly valve is in a closed state, the water inlet hole 21 is opened, the mounting cavity 23 has higher water pressure, meanwhile, water in the installation cavity 23 can enter the groove 521 of the first plugging plate 52 through the water through hole 522, so that the same water pressure is provided in the groove 521, therefore, the sealing block 523 can be pressed on the inner wall of the mounting cavity 23 under the action of water pressure, so that the sealing of the pressure relief hole 22 is improved, and the water leakage phenomenon at the position of the pressure relief hole 22 is avoided. The plugging piece further comprises a sliding column 5, the sliding column 5 is arranged in the installation cavity 23 in an axially sliding mode, a first plugging plate 52 and a second plugging plate 53 are fixed to the sliding column 5 through a connecting rod 51, a limiting sleeve 54 is arranged at the lower end of the sliding column 5, the upper end of the spring 9 is abutted to the limiting sleeve 54, a lower pressure plate 55 is fixed to the upper end of the sliding column 5, an operating mechanism can downwards press the lower pressure plate 55 to enable the pressure relief hole 22 to be opened, and the first plugging plate 52 and the second plugging plate 53 are connected in a sliding mode through the sliding column 5, so that the structure is more stable. The operating mechanism comprises a handle 6 for rotating the valve rod 2, the handle 6 is hinged at the upper end of the valve rod 2, the free end of the handle 6 can swing up and down, the upper end of the valve rod 2 is provided with a mounting hole 25, a pressing column 7 is arranged in the mounting hole 25 in a sliding manner, the upper end of the pressing column 7 extends out of the mounting hole 25, the lower end of the pressing column 7 is in transmission connection with the sliding column 5 through a transmission rod 71, when the pressing column 7 descends, the first blocking plate 52 can open the pressure relief hole 22, the second blocking plate 53 blocks the water inlet hole 21, the end part of the handle 6 is provided with a pressing part 61, the pressing part 61 is positioned above the pressing column 7, when the handle 6 swings upwards, the pressing part 61 can press the pressing column 7 downwards, when the butterfly valve needs to be opened or closed, the valve rod 2 needs to be rotated through the handle 6, the handle 6 is lifted upwards before rotation, so that the pressing part 61 presses the pressing column 7 downwards, make pressure release hole 22 open, inlet opening 21 closes to sealing 41 can not receive hydraulic effect opening and closing the in-process, release handle 6 when the butterfly valve is closed back, spring 9 can upwards push up traveller 5, makes pressure release hole 22 close, and inlet opening 21 opens, and the section of controling of handle 6 is longer usually, can be under self action of gravity down swing, makes to press the release of splenium 61 to press post 7. The valve rod 2 is internally provided with guide holes 26 along the axial direction, the two guide holes 26 are positioned at two sides of the abdicating hole 24, the guide holes 26 are symmetrically arranged, two transmission rods 71 are arranged in the two guide holes 26 in a sliding and penetrating way, the upper ends of the two transmission rods 71 are fixedly connected with the pressing column 7, the lower ends of the two transmission rods 71 extend out of the guide holes 26, an upper pressure plate 72 is fixed between the lower ends of the two transmission rods 71, a columnar rubber block 8 is fixed in the installation cavity 23, the outer peripheral surface of the rubber block 8 is in tight fit with the inner peripheral surface of the installation cavity 23, the rubber block 8 is positioned above the water inlet hole 21 and the pressure relief hole 22, the rubber block 8 is provided with a plurality of through holes 81 along the axial direction, the upper side surface of the lower pressure plate 55 is vertically fixedly connected with a plurality of top columns 56, the plurality of top columns 56 respectively penetrate through the plurality of through holes 81, the lower side surface of the upper pressure plate 72 is abutted against, two guiding holes 26 set up along valve rod 2 axial, and let hole 24 roughly set up along valve rod 2 radially, two guiding holes 26 are located and let hole 24 both sides, both can not take place to interfere, wherein block rubber 8 is used for sealing two guiding holes 26, fore-set 56 and through hole 81 tight fit simultaneously, consequently, can avoid water to leak from guiding hole 26, block rubber 8 can carry out circumference location through fore-set 56 to traveller 5 simultaneously, can push down fore-set 56 through two transfer lines 71 and last pressure disk 72 during pushing down press post 7, fore-set 56 pushes down press plate 55, thereby realize the removal of traveller 5.

Claims

1. A butterfly valve comprises a cylindrical valve body (1) and a valve rod (2), wherein the valve rod (2) is radially rotated to be arranged in the valve body (1) in a penetrating manner, one end of the valve rod (2) extends out of the valve body (1), and the valve rod (2) is provided with a disc-shaped valve clack (3), the butterfly valve is characterized in that an annular pressure groove (31) is circumferentially arranged on the outer peripheral surface of the valve clack (3), a rubber ring (4) is circumferentially arranged in the pressure groove (31), the rubber ring (4) protrudes out of the notch of the pressure groove (31), one side of the valve clack (3) of the valve rod (2) is provided with a water inlet hole (21), the other side of the valve clack (3) is provided with a pressure relief hole (22), the water inlet hole (21) and the pressure relief hole (22) are both communicated with the pressure groove (31), when the valve clack (3) is closed, a water inlet faces to one end of the valve body (1), a plugging piece capable of plugging the pressure relief hole (22) when the valve clack (3) is closed is further arranged in the valve clack (3), and an operating mechanism capable of enabling the plugging piece to open the pressure relief hole (22) and plug the water inlet hole (21) is arranged on the valve rod (2); a columnar mounting cavity (23) is formed in the valve rod (2), the water inlet hole (21) and the pressure relief hole (22) are communicated with the mounting cavity (23), the plugging piece comprises a first plugging plate (52) and a second plugging plate (53) which are fixedly connected, the cross sections of the first plugging plate (52) and the second plugging plate (53) are arc-shaped, the first plugging plate (52) and the second plugging plate (53) are attached to the inner wall of the mounting cavity (23), the convex surface of the first plugging plate (52) faces one side of the pressure relief hole (22), the convex surface of the second plugging plate (53) faces one side of the water inlet hole (21), the second plugging plate (53) is higher than the first plugging plate (52), a spring (9) is further arranged in the mounting cavity (23), the lower end of the spring (9) acts on the bottom surface of the mounting cavity (23), and the upper end of the spring acts on the first plugging plate (52) and the second plugging plate (53), the first blocking plate (52) blocks the pressure relief hole (22) under the action of the spring (9), and the second blocking plate (53) is higher than the water inlet hole (21).

2. The butterfly valve according to claim 1, wherein the rubber ring (4) is of a hollow structure, the cross section of the rubber ring (4) is of a D shape, the rubber ring (4) comprises a sealing portion (41) protruding out of the notch of the pressure groove (31) in an arc shape and a supporting portion (42) covering the inner cavity of the sealing portion (41), the supporting portion (42) is circumferentially provided with a plurality of communicating holes (421) communicating the inner cavity of the sealing portion (41) with the pressure groove (31), the inner wall of the valve body (1) is circumferentially provided with an annular sealing groove (11), the cross section of the sealing groove (11) is of an arc shape, and when the valve flap (3) is closed, the outer peripheral surface of the sealing portion (41) is attached and pressed in the sealing groove (11).

3. The butterfly valve according to claim 2, wherein the thickness of the sealing portion (41) is gradually reduced from the middle portion to both sides along the width direction, both side edges of the supporting portion (42) protrude from both sides of the sealing portion (41) and form an annular connecting convex edge (43), the pressure groove (31) has an annular concave shoulder (311) on both side groove walls, the connecting convex edge (43) abuts against the concave shoulder (311) and is pressed and fixed by the pressing ring (312), and a gap is formed between the supporting portion (42) and the bottom surface of the pressure groove (31).

4. The butterfly valve according to claim 1, 2 or 3, wherein the inlet hole (21) and the pressure relief hole (22) are both located at the center of the valve flap (3), a plurality of water through holes (32) are formed in the valve flap (3) in the circumferential direction, the water through holes (32) are radially arranged along the valve flap (3) in the length direction, one ends of the water through holes (32) are both communicated with the inlet hole (21) and the pressure relief hole (22), and the other ends of the water through holes are both communicated with the pressure groove (31).

5. The butterfly valve according to claim 4, wherein the valve rod (2) and the valve flap (3) are of an integral structure, the two ends of the valve rod (2) are provided with yielding holes (24) corresponding to the rubber rings (4), and the rubber rings (4) respectively pass through the two yielding holes (24).

6. The butterfly valve according to claim 1, 2 or 3, wherein a groove (521) is formed in a convex surface of the first blocking plate (52), a sealing block (523) is arranged in the groove (521) in a sliding manner, the sealing block (523) is provided with a sealing arc surface (524) which protrudes out of the groove (521) and is matched with the inner side surface of the mounting cavity (23), a gap is formed between the sealing block (523) and the bottom surface of the groove (521), a water through hole (522) communicated with the mounting cavity (23) is formed in the bottom surface of the groove (521), and when the first blocking plate (52) is opposite to the pressure relief hole (22), the sealing block (523) can block the pressure relief hole (22).

7. The butterfly valve according to claim 6, wherein the closure further comprises a spool (5), the spool (5) is axially slidably disposed in the mounting cavity (23), the first closure plate (52) and the second closure plate (53) are both fixed to the spool (5) through a connecting rod (51), a limit sleeve (54) is provided at the lower end of the spool (5), the upper end of the spring (9) abuts against the limit sleeve (54), a lower pressure plate (55) is fixed to the upper end of the spool (5), and the operating mechanism can press the lower pressure plate (55) downwards to open the pressure relief hole (22).

8. A butterfly valve according to claim 7, in which the operating mechanism comprises a handle (6) for rotating the valve stem (2), the handle (6) is hinged at the upper end of the valve rod (2), the free end of the handle (6) can swing up and down, the upper end of the valve rod (2) is provided with a mounting hole (25), a pressing column (7) is arranged in the mounting hole (25) in a sliding manner, the upper end of the pressing column (7) extends out of the mounting hole (25), the lower end of the pressing column (7) is in transmission connection with the sliding column (5) through a transmission rod (71), when the pressing column (7) descends, the first blocking plate (52) can open the pressure relief hole (22) and the second blocking plate (53) blocks the water inlet hole (21), the end part of the handle (6) is provided with a pressing part (61), the pressing part (61) is positioned above the pressing column (7), and the pressing part (61) can press down the pressing column (7) when the handle (6) swings upwards.

9. The butterfly valve according to claim 8, wherein the valve rod (2) is provided with two guide holes (26) along the axial direction, the two guide holes (26) are located at two sides of the abdicating hole (24), the guide holes (26) are symmetrically arranged, the two transmission rods (71) are provided with two transmission rods (71) which are slidably arranged in the two guide holes (26), the upper ends of the two transmission rods (71) are fixedly connected with the pressing column (7), the lower ends of the two transmission rods (71) extend out of the guide holes (26), an upper pressing plate (72) is fixed between the lower ends of the two transmission rods (71), a columnar rubber block (8) is fixed in the installation cavity (23), the outer peripheral surface of the rubber block (8) is tightly matched with the inner peripheral surface of the installation cavity (23), the rubber block (8) is located above the water inlet hole (21) and the pressure relief hole (22), the rubber block (8) is provided with a plurality of through holes (81) along the axial direction, a plurality of fore-posts (56) are vertically fixedly connected to the upper side face of the lower pressing plate (55), a plurality of fore-posts (56) penetrate through a plurality of through holes (81) respectively, the lower side face of the upper pressing plate (72) abuts against the upper ends of the plurality of fore-posts (56), and the fore-posts (56) are tightly matched with the rubber blocks (8).