CN115013546B - Two-way seal structure and butterfly valve - Google Patents
Two-way seal structure and butterfly valve Download PDFInfo
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- CN115013546B CN115013546B CN202210827773.1A CN202210827773A CN115013546B CN 115013546 B CN115013546 B CN 115013546B CN 202210827773 A CN202210827773 A CN 202210827773A CN 115013546 B CN115013546 B CN 115013546B
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- 238000007789 sealing Methods 0.000 claims abstract description 161
- 238000003825 pressing Methods 0.000 claims abstract description 62
- 230000007704 transition Effects 0.000 claims description 11
- 230000003139 buffering effect Effects 0.000 claims 2
- 230000002457 bidirectional effect Effects 0.000 abstract description 13
- 210000000664 rectum Anatomy 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 description 25
- 230000000694 effects Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 7
- 238000007667 floating Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The application relates to a bidirectional sealing structure and a butterfly valve, relating to the technical field of valves, wherein the bidirectional sealing structure comprises a valve seat and a valve core arranged in the valve seat, and the valve core comprises a valve core body, a valve core pressing ring and an elastic sealing ring; the valve core pressing ring is arranged on one side of the outer end of the valve core body, the elastic sealing ring is clamped between the valve core pressing ring and the valve core body, and the outer end of the elastic sealing ring is protruded relative to the valve core body and the valve core pressing ring; a movable gap is formed between the valve core pressing ring and the valve core body, the movable gap is used for enabling the valve core pressing ring to move towards or away from the elastic sealing ring, the valve core pressing ring is provided with a limiting piece, the limiting piece is fixedly connected with the valve core body, and the limiting piece is used for limiting the valve core pressing ring to be separated from the valve core body; and an annular conical surface for the elastic sealing ring to abut against is formed on the inner side of the valve seat. This application has two-way self-tightening sealing effectual, and satisfies the advantage of the large-traffic demand of full latus rectum.
Description
Technical Field
The utility model relates to the field of valve, especially, relate to a two-way seal structure and butterfly valve.
Background
The valve is a common control component in a pipeline fluid conveying system, and has the functions of opening and closing, controlling the flow direction, adjusting parameters of a conveying medium and the like. The valve mainly comprises a valve body, a valve seat, a valve core and a driving assembly, wherein the valve seat is arranged in the valve body and used for supporting the valve core at a fully-closed position and forming a sealing pair, and the driving assembly is used for controlling the valve core to be opened and closed. Common valve types include ball valves, butterfly valves, diaphragm valves, gate valves, check valves, etc., wherein the butterfly valves, i.e., valve cores, are circular butterfly plates, and are opened and closed by rotating around valve rods as shafts.
The most important technical performance index of the valve is sealing performance, wherein the sealing performance refers to the capability of preventing medium leakage of each sealing part of the valve, and the contact part of a valve seat and a valve core is one sealing part of the valve. The contact position of a valve seat and a valve core of a common butterfly valve is generally a one-way sealing structure, has a sealing effect when bearing pressure in the forward direction, and easily causes the problem of medium leakage when bearing pressure in the reverse direction.
In the related art, a bidirectional sealing structure exists, and in the process of implementing the application, the inventor finds that at least the following problems exist in the technology: the floating structure is generally arranged on the valve seat, so that the valve seat can move under the action of reverse medium pressure to tightly support the valve core, reverse sealing is realized, the drift diameter of the valve seat is reduced, namely the flow of the medium passing through is reduced, and the requirement of large flow of the full drift diameter cannot be met.
Disclosure of Invention
In order to improve the problem that floating structure setting leads to the disk seat latus rectum to diminish on the disk seat, this application provides a two-way seal structure and butterfly valve.
In a first aspect, the present application provides a bidirectional sealing structure, which adopts the following technical scheme:
a bidirectional sealing structure comprises a valve seat and a valve core arranged in the valve seat, wherein the valve core comprises a valve core body, a valve core pressure ring and an elastic sealing ring;
the valve core pressing ring is arranged on one side of the outer end of the valve core body, the elastic sealing ring is clamped between the valve core pressing ring and the valve core body, and the outer end of the elastic sealing ring is protruded relative to the valve core body and the valve core pressing ring;
a movable gap is formed between the valve core pressing ring and the valve core body, the movable gap is used for enabling the valve core pressing ring to move towards or away from the elastic sealing ring, the valve core pressing ring is provided with a limiting piece, the limiting piece is fixedly connected with the valve core body, and the limiting piece is used for limiting the valve core pressing ring to be separated from the valve core body;
an annular conical surface for the elastic sealing ring to tightly abut against is formed on the inner side of the valve seat.
By adopting the technical scheme, when the valve core bears pressure in the forward direction in the fully closed state, the pressure acts on the outer end part of the elastic sealing ring and enables the elastic sealing ring to tightly support the annular conical surface, and the larger the pressure is, the larger the supporting acting force between the elastic sealing ring and the valve seat is, so that a good sealing effect is realized.
When the pressure is reversely loaded, the valve core pressure ring bears the pressure and acts on the elastic sealing ring, so that the outer end part of the elastic sealing ring abuts against the annular conical surface, and the reverse self-tightening sealing is realized.
The bidirectional sealing structure adopts the floatable arrangement of the valve core pressure ring, on one hand, the bidirectional sealing can be realized without changing any additional parts of the conventional common unidirectional soft sealing butterfly valve, and the manufacturing cost is low; on the other hand, the drift diameter of the valve seat cannot be reduced, and the requirement of large flow of the full drift diameter is met.
Optionally, the movable gap is communicated with a through cavity extending to the outer side of the valve core, and the through cavity is formed between the inner end of the valve core pressure ring and the valve core body.
Through adopting above-mentioned technical scheme, lead to the chamber and play the effect of balanced clearance and the outer side pressure of case for the case clamping ring is changeed in extrudeing the elastic sealing ring, improves sealed effect.
Optionally, a groove is formed in the inner end of the elastic sealing ring, and the movable gap is communicated with the groove.
By adopting the technical scheme, on one hand, fluid can enter the groove along the through cavity and the movable gap, so that the elastic sealing ring is subjected to fluid pressure from inside to outside, and the pressure is enhanced along with the enhancement of the fluid pressure; on the other hand, when the valve core pressing ring extrudes the elastic sealing ring, the groove guides the deformation of the elastic sealing ring, so that the elastic sealing ring is easier to deform outwards. Therefore, the arrangement of the groove is beneficial to enabling the elastic sealing ring to better abut against the valve seat, and the sealing performance is improved.
In addition, the valve core is closed in-process, and when the valve core contacted with the disk seat, the recess provided the resilience space for the elastic sealing ring to can avoid disk seat to the compulsory extrusion of elastic sealing ring, reduce the switching moment of torsion and improve life-span.
Optionally, the groove is circumferentially arranged along the inner end of the elastic sealing ring, and the cross section of the bottom wall of the groove is arc-shaped.
Through adopting above-mentioned technical scheme, increase the area of contact of fluid and recess inner wall, and then improve sealed effect.
Optionally, the two opposite sides of the elastic sealing ring are provided with limiting strips, one opposite side of the valve core pressing ring and the valve core body is provided with a limiting groove for clamping the limiting strips, and the other opposite side of the limiting strips is provided with a protrusion.
Through adopting above-mentioned technical scheme, improve the stability of elastic seal circle installation, and only need very little pretightning force can realize sealing when case body and the equipment of case clamping ring, and then reduce the influence that case clamping ring floated setting to elastic seal circle fastening nature.
Optionally, the width of the outer end of the elastic sealing ring is gradually reduced along the direction towards the annular conical surface.
By adopting the technical scheme, according to the principle that the pressure can be improved when a large flow enters the narrow flow channel in fluid mechanics, the elastic sealing ring generates high contact sealing specific pressure after contacting with the valve seat, and the reverse sealing performance is excellent.
Optionally, the outer end face of the valve core pressing ring is provided with an inclined face, and the distance between the inclined face and the valve seat gradually increases along the direction departing from the elastic sealing ring.
By adopting the technical scheme, on one hand, the outer end face of the valve core pressure ring avoids the valve seat, and the two-way sealing structure is convenient for the valve core to rotate when being applied to a butterfly valve; on the other hand, the compression area of the valve core compression ring is increased, and the extrusion effect of the valve core compression ring on the elastic sealing ring is further improved
Optionally, the outer end of the valve core body is provided with a yielding groove for clamping the valve core pressing ring.
Through adopting above-mentioned technical scheme, reduce the whole thickness of case in case clamping ring department, be favorable to improving the flow.
Optionally, the limiting part is a limiting screw, the valve core pressing ring is provided with a countersunk hole through which the limiting screw passes, and the limiting screw is in threaded connection with the valve core body.
Through adopting above-mentioned technical scheme, it is convenient to produce the equipment, with stop screw pass the case clamping ring and twist the case body can.
Optionally, the valve core pressing ring is in threaded connection with a positioning screw, and a gap is formed between the positioning screw and the valve core body when the valve core pressing ring is not pressed.
By adopting the technical scheme, during assembly, the positioning screw is firstly arranged on the valve core pressure ring, then the valve core pressure ring is arranged on the valve core body and clamps the elastic sealing ring, so that the positioning screw contacts the valve core body, then the limiting screw is arranged until the head of the limiting screw is attached to the inner wall of the countersunk hole, and then the positioning screw is reversely screwed, so that a gap is formed between the positioning screw and the valve core body, and the size of the gap is the floating amount of the valve core pressure ring. The positioning screw plays a role in adjusting the floating amount of the valve core compression ring.
Optionally, two sides of the annular conical surface are respectively connected with a buffer surface and a transition surface, the transition surface is opposite to the valve core pressure ring and is parallel to the valve core axial line, and the inclination of the buffer surface relative to the valve core axial line is greater than that of the annular conical surface.
Through adopting above-mentioned technical scheme, the case is guaranteeing that the elastic sealing circle is in the same direction as smooth the passing through closing the process, avoids scraping of traditional structure to collide with the card pause phenomenon, guarantees sealing performance, reduces the moment of torsion, increase of service life.
In a second aspect, the present application provides a butterfly valve that adopts following technical scheme:
a butterfly valve comprises a valve body, a valve rod and a bidirectional sealing structure.
Through adopting above-mentioned technical scheme, two-way seal structure is applicable to the butterfly valve, especially two eccentric butterfly valves.
Optionally, the valve rod is divided into an upper valve rod and a lower valve rod, the upper valve rod and the lower valve rod are both connected with the valve core body, the valve body is provided with an upper through hole for the upper valve rod to pass through and a lower through hole for the lower valve rod to pass through, shaft sleeves are sleeved on the outer sides of the upper valve rod and the lower valve rod, the valve core body is provided with a slot for the shaft sleeves to insert, one end, far away from the upper valve rod, of the lower valve rod is abutted to a lower end cover, an upper end cover abutted to the corresponding shaft sleeve is sleeved on the outer side of the upper valve rod, and the upper end cover, the lower end cover and the valve body are connected through adjusting screws.
By adopting the technical scheme, the positions of the upper end cover and the lower end cover can be adjusted by screwing the adjusting screw, so that the position of the valve core can be adjusted in a small range, the valve core is convenient to align the valve seat, the influence of machining errors is reduced, and the sealing performance is ensured.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the valve is sealed in two directions by the aid of the floatable arrangement of the valve core pressure ring and the innovative structural design of the elastic sealing ring, reverse sealing pressure is more than 60% of forward sealing pressure according to standard regulation, the reverse sealing pressure can be far higher than the forward sealing pressure by the aid of the two-way sealing structure, leakage does not exist under the condition that the pressure is equal to the forward pressure through a reverse pressure test of the valve, and the self-tightening sealing effect is very good;
2. the bidirectional sealing can be realized without changing any additional parts in the conventional ordinary unidirectional soft sealing butterfly valve, and the manufacturing cost is low;
3. the utility model provides a disk seat latus rectum can not diminish, and the setting of biax about the valve rod divide into, compares in the sectional area of unipolar mode case itself and diminishes, and the latus rectum grow satisfies the large-traffic demand of full latus rectum to reach application pipe-line system energy saving and consumption reduction's design purpose.
Drawings
FIG. 1 is a schematic diagram of a butterfly valve according to an embodiment of the present disclosure;
FIG. 2 is a schematic cross-sectional view of a butterfly valve according to an embodiment of the present application;
FIG. 3 is an enlarged schematic view of area A of FIG. 2;
FIG. 4 is an enlarged schematic view of region B of FIG. 2;
FIG. 5 is an enlarged schematic view of region C of FIG. 2;
FIG. 6 is a cross-sectional schematic view of a valve seat of an embodiment of the present application;
FIG. 7 is a schematic cross-sectional view of an elastomeric seal ring according to an embodiment of the present application;
FIG. 8 is a schematic structural diagram of a valve cartridge according to an embodiment of the present application;
fig. 9 is a schematic structural view of a valve body according to an embodiment of the present application.
Description of the reference numerals: 1. a valve seat; 11. an annular conical surface; 12. a buffer surface; 13. a transition surface; 2. a valve core; 21. a valve core body; 211. a yielding groove; 212. inserting slots; 22. the valve core is pressed and the ring is pressed; 221. an inclined surface; 222. a countersunk hole; 23. an elastic sealing ring; 231. a groove; 232. a limiting strip; 233. a protrusion; 24. a clearance for movement; 25. a limiting member; 26. a cavity is communicated; 27. a limiting groove; 28. a set screw; 3. a valve body; 31. an upper through hole; 32. a lower through hole; 4. an upper valve stem; 5. a lower valve stem; 6. a shaft sleeve; 7. an upper end cover; 8. a lower end cover; 9. and adjusting the screw.
Detailed Description
The present application is described in further detail below with reference to figures 1-9.
In the embodiment of the present application, the orientation description related to the "inner end" and the "outer end" is based on the fully closed state of the valve element 2, and the axial lead of the valve element 2 is parallel to the moving direction of the fluid. The inner end is the end close to the axial lead of the valve core 2, and the outer end is the end far away from the axial lead of the valve core 2.
A butterfly valve, referring to fig. 1, includes a valve body 3, a valve rod and a bidirectional sealing structure, in the embodiment of the present application, a specific structure is described by taking a double-eccentric butterfly valve as an example, in other embodiments, the bidirectional sealing structure may also be applied to other types of butterfly valves, even other types of valves, such as a ball valve and a half ball valve.
Referring to fig. 1 and 2, the bidirectional sealing structure includes a valve seat 1 and a valve core 2 disposed in the valve seat 1, the valve seat 1 is annular and integrally formed on an inner wall of a valve body 3, and the valve core 2 is a butterfly plate and is in contact sealing with the valve seat 1. The valve core 2 is connected with the valve rod, so that the valve rod can drive the valve core 2 to rotate, and the valve core 2 is fully opened or closed.
Referring to fig. 2, the valve stem is divided into an upper valve stem 4 and a lower valve stem 5 which are coaxially disposed, and the upper valve stem 4 and the lower valve stem 5 are respectively connected to opposite ends of the valve core 2. The valve body 3 is provided with an upper through hole 31 for the upper valve rod 4 to pass through and a lower through hole 32 for the lower valve rod 5 to pass through, and the opposite ends of the upper through hole 31 and the lower through hole 32 are communicated with the inner cavity of the valve body 3. Go up valve rod 4 and the equal activity in lower valve rod 5 outside and cup jointed axle sleeve 6, two axle sleeves 6 paste the inner wall of through-hole 31 and lower through-hole 32 respectively, and two axle sleeves 6 one end in opposite directions all support tight case 2. The inside wall, the lateral wall of axle sleeve 6 and the end wall that is close to case 2 all are provided with first seal groove, all are provided with first sealing ring in the first seal groove, and first sealing ring supports tight valve body 3, valve rod or case 2.
Referring to fig. 2 and 3, two opposite sides of the shaft sleeves 6 are respectively and tightly abutted with an upper end cover 7 and a lower end cover 8, the upper end cover 7 is arranged in a hollow mode and is used for the upper valve rod 4 to penetrate through, and the lower end cover 8 is tightly abutted with one end, far away from the upper valve rod 4, of the lower valve rod 5. The outer sides of the back ends of the upper end cover 7 and the lower end cover 8 are both provided with convex edges, and a gap is reserved between the convex edges and the valve body 3. A plurality of adjusting screws 9 are arranged on the convex edge at intervals in the circumferential direction, and the head of each adjusting screw 9 abuts against the convex edge and the rod part of each adjusting screw and is in threaded connection with the valve body 3. Through the adjusting screw 9 of turning upper end cover 7 and lower end cover 8 department, can make the position of upper end cover 7 and lower end cover 8 finely tune, and the action of upper end cover 7 and lower end cover 8 is on the contrary, and then acts on axle sleeve 6 and finely tunes in order to drive the position of case 2. When the valve core 2 is not completely aligned to the valve seat 1 due to machining errors after the assembly is finished and leakage occurs, the valve core 2 can be aligned to the valve seat 1 by finely adjusting the position of the valve core 2, and sealing performance is guaranteed.
Referring to fig. 3, a second sealing groove is formed in the inner side wall of the upper end cover 7, and a second sealing ring abutting against the upper valve rod 4 is arranged in the second sealing groove. A third sealing groove is arranged on the outer side of the upper end cover 7, and a third sealing ring which tightly abuts against the inner wall of the upper through hole 31 is arranged in the third sealing groove.
Referring to fig. 4, a fourth sealing groove is formed in the outer side wall of the lower end cover 8, and a fourth sealing ring abutting against the inner wall of the lower through hole 32 is arranged in the fourth sealing groove. The convex edges of the upper end cover 7 and the lower end cover 8 are both connected with a plurality of fastening screws at intervals along the circumferential direction in a threaded manner, and the fastening screws are hexagon socket flat end fastening screws. When the adjusting screw 9 is screwed until the valve core 2 is completely aligned with the valve seat 1, the fastening screw is screwed until the valve body 3 is tightly abutted, so that the fastening effect is achieved, the valve core 2 and the valve seat 1 are ensured to be concentric in a closed state, and the sealing effect is improved.
Referring to fig. 2 and 5, the valve core 2 includes a valve core body 21, a valve core pressing ring 22 and an elastic sealing ring 23, the valve core body 21 is in a circular butterfly plate shape, and a valve rod sleeve is integrally formed at two opposite ends of one side of the valve core body 21 facing to a fluid inlet direction. Two valve rod sleeves are respectively inserted by an upper valve rod 4 and a lower valve rod 5, and the upper valve rod 4 and the corresponding valve rod sleeve are relatively fixed through a cylindrical pin. The valve core body 21 is provided with a slot 212 for inserting the shaft sleeve 6 at the position of the valve rod sleeve, so that the sealing performance between the shaft sleeve 6 and the valve core 2 is improved.
Referring to fig. 2, "forward pressure-bearing" refers to the direction of fluid entering the butterfly valve, i.e. flowing from left to right, and "reverse pressure-bearing" refers to the direction opposite to "forward pressure-bearing". In the embodiment of the present application, the valve plug pressure ring 22 is located on a side of the valve plug body 21 facing away from the fluid entering direction, so that the valve plug pressure ring 22 receives an acting force of a reverse pressure, and the structure is described based on this. However, since the bidirectional sealing structure of the embodiment of the present application has excellent reverse sealing performance, in the remaining embodiments, the poppet compression ring 22 can be used to bear the force of the forward pressure.
Referring to fig. 2 and 5, the outer end of the valve body 21 on the side opposite to the fluid entering direction is provided with a relief groove 211, and the valve body pressing ring 22 is clamped in the relief groove 211. The elastic sealing ring 23 is clamped between the valve core pressing ring 22 and the outer end of the valve core body 21, and the outer end of the elastic sealing ring 23 protrudes relative to the valve core body 21 and the valve core pressing ring 22. Be provided with movable gap 24 between case clamping ring 22 and the case body 21, movable gap 24 is used for supplying case clamping ring 22 towards or deviates from the activity of elastic seal ring 23, consequently can extrude elastic seal ring 23 behind the effort that consequently case clamping ring 22 received reverse pressure-bearing for elastic seal ring 23 outer tip supports tight disk seat 1, realizes reverse self-tightening sealing.
Referring to fig. 5 and 6, an annular conical surface 11 for abutting against the elastic sealing ring 23 is formed in the middle of the inner side of the valve seat 1, and the inner diameter of the annular conical surface 11 is gradually reduced along the fluid entering direction, so that when the valve element 2 is under a forward pressure-bearing acting force in a fully closed state, the outer end of the elastic sealing ring 23 is pressed to abut against the annular conical surface 11, the contact sealing effect of the valve element 2 and the valve seat 1 is ensured, and the butterfly valve has high forward pressure-bearing capacity.
Referring to fig. 5 and 6, a buffer surface 12 and a transition surface 13 are respectively connected to two sides of the annular conical surface 11, the buffer surface 12 is located on one side of the annular conical surface 11 facing the fluid inlet direction, and the inclination of the buffer surface 12 relative to the axial line of the valve plug is greater than that of the annular conical surface 11. The transition surface 13 is opposite to the valve core pressing ring 22 and is parallel to the axial line of the valve core, and the transition surface 13 and the annular conical surface 11 as well as the buffer surface 12 and the annular conical surface 11 are in transition through an angle R. The opposite side of the transition surface 13 and the annular conical surface 11 is connected with a slope surface through an arc surface, and the slope surface extends to the inner cavity wall of the valve body 3.
In the closing process of the valve core 2, one side of the elastic sealing ring 23 is smoothly transited to the buffer surface 12 through the arc-shaped surface, and at the moment, the elastic sealing ring 23 starts to be extruded and then reaches the annular conical surface 11 through an angle R; due to the principle of double eccentricity, the other side of the elastic sealing ring 23 is provided with a short rotating radius, passes through the arc-shaped surface and the transition surface 13 and then reaches the annular conical surface 11 through the angle R. In the embodiment of the application, the structure of the valve seat 1 is an innovative design, and has the following advantages: (1) the cross section area of the ring is small, so that the flow resistance of fluid passing through the valve seat 1 in practical application is as small as possible, and the fluid cannot generate turbulent flow when passing through the valve seat; (2) the valve core 2 ensures that the elastic sealing ring 23 smoothly passes through in the closing process, avoids the phenomenon of scraping and blocking in the traditional structure, ensures the sealing performance, reduces the torque and prolongs the service life.
Referring to fig. 5, in the embodiment of the present application, the elastic sealing ring 23 is made of rubber, and the poisson's ratio of the rubber is close to that of water, and the elastic sealing ring 23 has incompressibility, so that the elastic sealing ring 23 can deform and abut against the valve seat 1 after being pressed. This application utilizes the incompressible characteristic of rubber and case clamping ring to adopt the mode that floats to set up, realizes excellent reverse sealed effect after both combine.
In other embodiments, the elastic sealing ring 23 may also be made of other flexible materials with high poisson's ratio.
Referring to fig. 5 and 7, the inner end of the elastic sealing ring 23 is provided with a groove 231, the groove 231 is circumferentially arranged along the inner end of the elastic sealing ring 23, and the cross section of the bottom wall of the groove 231 is arc-shaped. When the valve core pressing ring 22 extrudes the elastic sealing ring 23, the groove 231 guides the deformation of the elastic sealing ring 23, so that the elastic sealing ring 23 is easier to deform outwards. In addition, in the closing process of the valve core 2, when the valve core 2 contacts the valve seat 1, the groove 231 provides a rebound space for the elastic sealing ring 23, so that the forced extrusion of the valve seat 1 on the elastic sealing ring 23 can be avoided, the switching torque is reduced, and the service life is prolonged.
Referring to fig. 5 and 7, the two opposite sides of the inner end of the elastic sealing ring 23 are integrally formed with a limiting strip 232, one opposite side of the valve core pressing ring 22 and the valve core body 21 are provided with a limiting groove 27 for the limiting strip 232 to be clamped in, and two protrusions 233 are integrally formed on one opposite side of the two limiting strips 232. When the valve core body 21 and the valve core pressure ring 22 are assembled, sealing can be realized only by small pretightening force, and the installation stability of the elastic sealing ring 23 is improved.
Referring to fig. 5 and 7, in the embodiment of the present application, the width of the outer end of the elastic sealing ring 23 gradually decreases in a direction toward the annular tapered surface 11, and the outer end of the elastic sealing ring 23 is arc-shaped. When the elastic sealing ring 23 is restrained in several directions, the valve core pressing ring 22 presses the elastic sealing ring, and the pressed rubber moves to a space with a gap, namely the direction of the valve seat 1, due to the incompressibility of the rubber. In the embodiment of this application, the one end that elastic seal ring 23 is close to disk seat 1 is narrow, the other end is wide, according to the principle that pressure can improve when large-traffic entering narrow runner among the hydrodynamics for by case clamping ring 22 extrusion back, rubber is toward the activity of narrower one side, and the sealed ratio pressure of contact that produces after contacting with disk seat 1 is high.
In the prior art, the outer end of the T-shaped rubber sealing ring is basically parallel to the two opposite side surfaces, namely the width dimension is unchanged, so that the generated specific pressure is not increased. The elastic sealing ring 23 in the embodiment of the present application is an innovation in the structural design for matching with the floating arrangement of the valve core pressing ring 22, and is obviously different from the existing T-shaped rubber sealing ring in the market.
Referring to fig. 2 and 5, the movable gap 24 is communicated with a through cavity 26 extending to the outer side of the valve core 2, in the embodiment of the present application, the diameter of the inner wall of the abdicating groove 211 is smaller than the inner diameter of the valve core pressing ring 22, so that the through cavity 26 is formed between the inner end of the valve core pressing ring 22 and the valve core body 21. One end of the movable gap 24, which is far away from the through cavity 26, is communicated with the groove 231, so that fluid can enter the groove 231 along the through cavity 26 and the movable gap 24, the elastic sealing ring 23 is subjected to fluid pressure from inside to outside, the pressure is enhanced along with the enhancement of the fluid pressure, and the reverse sealing effect is good. And the through cavity 26 also plays a role in balancing the movable gap 24 and the pressure outside the valve core 2, so that the valve core pressing ring 22 can extrude the elastic sealing ring 23 more easily, and the sealing effect is improved.
In other embodiments, the lumen 26 may be arranged in a variety of ways. 1. The through cavity 26 is arranged on the valve core pressure ring 22 in a penetrating way; 2. the through cavity 26 is arranged on the valve core body 21 in a penetrating manner, and an opening at one end of the through cavity 26, which is far away from the movable gap 24, is positioned on one side of the valve core body 21, which is opposite to the fluid inlet direction; 3. the through cavity 26 is disposed on the valve body 21 in a penetrating manner, and an opening of one end of the through cavity 26, which is far away from the movable gap 24, is located on one side of the valve body 21 facing the fluid entering direction. The 1 st and 2 nd arrangement mode have the problem that the processing cost is high, and the 3 rd arrangement mode has the processing cost high, and fluid can't get into clearance 24 during reverse pressure-bearing, leads to chamber 26 and plays the effect of balanced pressure and improvement forward pressure-bearing leakproofness. Thus, the through cavity 26 arrangement of the present embodiment is most preferred.
Referring to fig. 5 and 8, the outer end surface of the pressing ring 22 is provided with an inclined surface 221, and the distance between the inclined surface 221 and the valve seat 1 gradually increases in a direction away from the elastic sealing ring 23. The valve core pressing ring 22 is provided with a plurality of limiting members 25 at intervals along the circumferential direction, in the embodiment of the present application, the limiting members 25 are limiting screws, the valve core pressing ring 22 is provided with countersunk holes 222 through which the limiting screws pass, and the limiting screws are in threaded connection with the valve core body 21. When the valve core pressing ring 22 is not subjected to the reverse pressure-bearing acting force, the head of the limiting screw is attached to the inner wall of the counter bore 222 under the action of the elastic force of the elastic sealing ring 23.
In other embodiments, the limiting member 25 includes a rod portion and a limiting head portion fixedly connected to the rod portion, the rod portion penetrates through the valve plug pressing ring 22 and is fixedly connected to the valve plug body 21, and the limiting head portion is used for limiting the valve plug pressing ring 22 to be separated from the valve plug body 21 and enabling the valve plug pressing ring 22 to have a pre-tightening force on the elastic sealing ring 23.
Referring to fig. 8 and 9, in the embodiment of the present application, the spool pressure ring 22 is threadedly connected with a plurality of positioning screws 28 at intervals along the circumferential direction, and the positioning screws 28 and the limit screws are arranged in a staggered manner. The positioning screw 28 is a hexagon socket flat end set screw, and the length of the positioning screw 28 is larger than the thickness of the valve core pressing ring 22. When the spool pressure ring 22 is not pressed, a gap is formed between the set screw 28 and the spool body 21.
The assembly process of the valve core 2 is as follows:
1. the elastic sealing ring 23 is arranged in the valve core body 21;
2. screwing a plurality of positioning screws 28 into the valve core pressing ring 22, extending the end parts of the positioning screws 28 out of the contact surface of the valve core pressing ring 22 and the elastic sealing ring 23, and enabling the extending length of each positioning screw 28 to be equal;
3. then the valve core pressure ring 22 provided with the positioning screw 28 is arranged on the valve core body 21 to clamp the elastic sealing ring 23;
4. the limiting screws penetrate through the valve core pressing ring 22 and are screwed into the valve core body 21, so that the end parts of the plurality of positioning screws 28 are all abutted against the valve core body 21;
5. the positioning screws 28 are screwed in opposite directions one by one in equal circles, and according to the withdrawing length of the positioning screws 28, the width of a gap between the positioning screws 28 and the valve core body 21 can be obtained, and the size of the gap is the maximum floating amount of the valve core pressing ring 22 for pressing the elastic sealing ring 23 under the action of fluid pressure.
The implementation principle of the butterfly valve in the embodiment of the application is as follows:
when the valve core body 21 is positively pressurized, fluid flows in from the space between the buffer surface 12 and the valve core body 21 and acts on the outer end part of the elastic sealing ring 23, and the elastic sealing ring 23 is pressurized to tightly abut against the annular conical surface 11, so that the positive pressure-bearing sealing performance is ensured.
When the pressure is reversely loaded, the fluid flows into the groove 231 along the through cavity 26 and the movable gap 24 to act on the inner end part of the elastic sealing ring 23, the elastic sealing ring 23 is subjected to fluid pressure from inside to outside, and the valve core pressing ring 22 presses the elastic sealing ring 23 to deform the elastic sealing ring 23 towards the valve seat 1, so that the outer end part of the elastic sealing ring 23 abuts against the annular conical surface 11, and the reverse pressure-loading sealing performance is ensured.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (12)
1. The utility model provides a two-way seal structure, includes disk seat (1), sets up case (2) in disk seat (1), its characterized in that: the valve core (2) comprises a valve core body (21), a valve core pressure ring (22) and an elastic sealing ring (23);
the valve core pressing ring (22) is arranged on one side of the outer end of the valve core body (21), the elastic sealing ring (23) is clamped between the valve core pressing ring (22) and the valve core body (21), and the outer end of the elastic sealing ring (23) protrudes relative to the valve core body (21) and the valve core pressing ring (22);
a movable gap (24) is arranged between the valve core pressing ring (22) and the valve core body (21), the movable gap (24) is used for enabling the valve core pressing ring (22) to move towards or away from the elastic sealing ring (23), the valve core pressing ring (22) is provided with a limiting piece (25), the limiting piece (25) is fixedly connected with the valve core body (21), and the limiting piece (25) is used for limiting the valve core pressing ring (22) to be separated from the valve core body (21);
an annular conical surface (11) for the elastic sealing ring (23) to tightly abut against is formed on the inner side of the valve seat (1);
the valve core pressing ring (22) is in threaded connection with a positioning screw (28), and a gap is reserved between the positioning screw (28) and the valve core body (21) when the valve core pressing ring (22) is not pressed.
2. A bi-directional sealing structure according to claim 1, wherein: the movable gap (24) is communicated with a through cavity (26) extending to the outer side of the valve core (2), and the through cavity (26) is formed between the inner end of the valve core pressing ring (22) and the valve core body (21).
3. A bi-directional sealing structure according to claim 2, wherein: the inner end of the elastic sealing ring (23) is provided with a groove (231), and the movable gap (24) is communicated with the groove (231).
4. A bi-directional sealing structure according to claim 3, wherein: the groove (231) is circumferentially arranged along the inner end of the elastic sealing ring (23), and the cross section of the bottom wall of the groove (231) is arc-shaped.
5. A bi-directional sealing structure according to claim 1, wherein: elastic seal circle (23) both sides relatively are provided with spacing strip (232), case clamping ring (22) and case body (21) all are provided with spacing groove (27) that are used for supplying spacing strip (232) card to go into in one side in opposite directions, two spacing strip (232) mutually carry on the back of the body one side and all are provided with arch (233).
6. A bi-directional sealing structure according to claim 1, wherein: the width of the outer end of the elastic sealing ring (23) is gradually reduced along the direction towards the annular conical surface (11).
7. A bi-directional sealing structure according to claim 1, wherein: the outer end face of the valve core pressing ring (22) is provided with an inclined face (221), and the distance between the inclined face (221) and the valve seat (1) is gradually increased along the direction departing from the elastic sealing ring (23).
8. A bi-directional sealing structure according to claim 1, wherein: the outer end of the valve core body (21) is provided with a yielding groove (211) for the valve core pressing ring (22) to be clamped in.
9. A bi-directional sealing structure according to claim 1, wherein: the limiting piece (25) is a limiting screw, the valve core pressing ring (22) is provided with a countersunk hole (222) for the limiting screw to penetrate through, and the limiting screw is in threaded connection with the valve core body (21).
10. A bi-directional sealing structure according to claim 1, wherein: the two sides of the annular conical surface (11) are respectively connected with a buffering surface (12) and a transition surface (13), the transition surface (13) is opposite to the valve core pressing ring (22) and is parallel to the axial lead of the valve core (2), and the inclination of the buffering surface (12) relative to the axial lead of the valve core (2) is greater than that of the annular conical surface (11).
11. The utility model provides a butterfly valve, includes valve body (3), valve rod, its characterized in that: further comprising the bi-directional sealing structure of any one of claims 1 to 10.
12. A butterfly valve in accordance with claim 11, wherein: the valve rod divide into valve rod (4) and lower valve rod (5), go up valve rod (4) and lower valve rod (5) and all be connected with case body (21), valve body (3) are provided with last through-hole (31) that confession valve rod (4) passed, lower through-hole (32) that confession lower valve rod (5) passed, go up valve rod (4) and lower valve rod (5) outside and all cup jointed axle sleeve (6), case body (21) are provided with and supply axle sleeve (6) male slot (212), the one end butt that last valve rod (4) were kept away from in lower valve rod (5) has lower end cover (8), go up valve rod (4) outside and cup jointed upper end cover (7) that the butt corresponds axle sleeve (6), all be connected through adjusting screw (9) between upper end cover (7) and lower end cover (8) and valve body (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210827773.1A CN115013546B (en) | 2022-07-14 | 2022-07-14 | Two-way seal structure and butterfly valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210827773.1A CN115013546B (en) | 2022-07-14 | 2022-07-14 | Two-way seal structure and butterfly valve |
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| Publication Number | Publication Date |
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| CN115013546A CN115013546A (en) | 2022-09-06 |
| CN115013546B true CN115013546B (en) | 2023-03-14 |
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| CN202210827773.1A Active CN115013546B (en) | 2022-07-14 | 2022-07-14 | Two-way seal structure and butterfly valve |
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Address after: 325013 No. 32, Gangqiang Road, Yongxing street, Longwan District, Wenzhou City, Zhejiang Province Patentee after: Lianggu Valve Group Co.,Ltd. Address before: 325013 No. 32, Gangqiang Road, Yongxing street, Longwan District, Wenzhou City, Zhejiang Province Patentee before: LIANGGONG VALVE GROUP CO.,LTD. |