CN115560085A - Valve clack and valve using same - Google Patents

Abstract

The invention discloses a valve clack and a valve using the same, wherein the valve clack comprises a valve clack body, a sealing gasket and a sealing gasket retaining piece, the sealing gasket is connected with the valve clack body through the sealing gasket retaining piece, and the sealing gasket retaining piece is hermetically connected with the valve clack body; the gasket is at least partially in contact with the gasket holder, and the contact surface includes an annular profile where at least compressive deformation in a first direction occurs by being pressed by the gasket holder, the first direction being a radial direction of the annular profile and being away from a side of the gasket holder; the sealing gasket is provided with annular flanges facing opposite directions of the first direction, the sealing gasket retaining piece is abutted with the annular flanges so as to at least limit the movement of the annular flanges along the direction opposite to the second direction, the second direction is the normal direction of the plane of the annular outline and is close to one side of the valve clack body, the sealing gasket is fixed on the valve clack body by the sealing gasket retaining piece, and the generated local compression improves the sealing performance of the whole valve clack.

Description

Valve clack and valve using same

Technical Field

The invention relates to the field of valve correlation, in particular to a valve clack and a valve using the same.

Background

With the development of fluid technology, whether in industrial, medical or domestic fields, various fluids are more and more widely used, for example, part of fluids required in semiconductor manufacturing processes have certain corrosiveness or toxicity, and high-pressure fluids of 10MPa or even higher are used in part of industrial manufacturing fields, so that high requirements are imposed on the sealing performance of fluid pipelines or fluid containers, and particularly, the sealing performance of valves or other devices requiring control over the on-off and opening of the fluid greatly affects the whole fluid pipeline or fluid container.

Taking a valve as an example, an existing valve generally includes a valve body and a valve flap disposed in the valve body, where the valve flap moves relative to the valve body to open and close the valve. To ensure that the valve effectively cuts off the flow path, the flap is typically provided with a gasket that contacts the valve seat on the valve body sufficiently to ensure a seal, thereby cutting off the flow line on either side of the valve seat.

However, because the sealing gasket and the valve flap body are usually made of different materials, a certain gap is difficult to avoid when the sealing gasket and the valve flap body are assembled together, and a small amount of fluid flows from one side of the valve seat to the other side along the gap, so that fluid leakage is generated to a certain extent, and therefore, how to further improve the sealing performance of the valve flap is a technical problem to be solved in the field.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the technical defect that fluid leakage to a certain degree is generated because the sealing gasket and the valve clack body cannot be completely and hermetically connected in the prior art.

In order to solve or alleviate the technical problems, embodiments of the present invention provide a valve flap and a valve using the same.

The technical scheme adopted by the invention for solving or relieving the technical problems is as follows: a valve clack comprises a valve clack body, a sealing gasket and a sealing gasket retaining piece, wherein the sealing gasket is connected with the valve clack body through the sealing gasket retaining piece; the gasket is at least partially in contact with the gasket holder, and the contact surface includes an annular profile where at least compressive deformation in a first direction occurs by being pressed by the gasket holder, the first direction being a radial direction of the annular profile and being away from a side of the gasket holder; the gasket is provided with an annular flange facing in the opposite direction to the first direction, and the gasket holder abuts against the annular flange to restrict at least the movement of the annular flange in the opposite direction to a second direction which is normal to the plane in which the annular contour lies and which is close to a side of the valve flap body.

In the scheme, the sealing gasket retaining piece extrudes the sealing gasket in the first direction, the sealing gasket is tightly abutted against the sealing gasket retaining piece, and the annular outline generates compression deformation, so that compression stress is generated, fluid is difficult to pass through a gap between the sealing gasket and the sealing gasket retaining piece, and the sealing property of the valve clack is improved; meanwhile, the sealing gasket retaining piece supports against the annular flange in the second direction, when the sealing gasket tends to fall off, the sealing gasket retaining piece and the sealing gasket are more tightly supported, so that the risk that the sealing gasket falls off the valve clack body is reduced, and meanwhile, local compression deformation is generated at the supporting part, so that the sealing property of the valve clack is further improved; the sealing gasket is limited in the first direction and the second direction, the first direction and the second direction are perpendicular to each other, so that the sealing gasket can form sufficient sealing with the sealing gasket retaining piece in all directions, and even if inevitable media permeate into a gap between the sealing gasket and the valve clack body, the compressive stress of the abutting part of the annular contour and/or the annular flange can also ensure the sealing performance as far as possible.

Preferably, the annular profiles are multiple, multiple adjacent annular profiles form a first curved surface, and the first curved surface is a continuous curved surface.

In this scheme, sealed the pad and the sealed pad holder offsets through a plurality of annular profiles, because the quantity of annular profile is a plurality of, the pressure between sealed pad and the sealed pad holder has been equallyd divide, simultaneously, because first curved surface is continuous, consequently sealed the contact surface increase between pad and the sealed pad holder, the local stress concentration between reducible sealed pad and the sealed pad holder to the sealed pad leads to the condition of failure because of local stress is too big when reducing the assembly or in the high pressure environment.

Preferably, one side of the sealing gasket, which is close to the first curved surface, is provided with a second curved surface, one side of the sealing gasket holder, which is close to the first curved surface, is provided with a third curved surface, and the second curved surface abuts against the third curved surface to form the first curved surface.

In the scheme, the first curved surface is formed by abutting the second curved surface of the sealing gasket with the third curved surface of the sealing gasket holder and generating corresponding deformation, and the second curved surface and the third curved surface only need to be processed as required before assembly.

Preferably, the second curved surface and the third curved surface are both continuous curved surfaces.

In this scheme, through such setting, guarantee as far as possible that the sealed pad and/or the sealed deformation of filling up the holder in first curved surface department are close, can guarantee sealed effect, reduced stress concentration's harm again.

Preferably, the second curved surface and the third curved surface are conical surfaces, the second curved surface forms a first included angle α with a normal of a plane where the annular contour is located, the third curved surface forms a second included angle β with a normal of a plane where the annular contour is located, and the first included angle α is smaller than the second included angle β.

In this embodiment, since the first included angle α is smaller than the second included angle β, the portion of the gasket in contact with the gasket holder is locally compressed excessively, that is, the amount of compression at this portion is greater than the amount of compression at other positions on the first curved surface, which is helpful to further enhance the sealing effect.

Preferably, the second curved surface and the third curved surface are conical surfaces, the second curved surface forms a first included angle α with a normal of a plane where the annular contour is located, the third curved surface forms a second included angle β with a normal of a plane where the annular contour is located, and the first included angle α is equal to the second included angle β.

In this scheme, first contained angle alpha equals second contained angle beta for even pressurized between sealed pad and the sealed pad holder improves the durability, and because second curved surface and third curved surface are the conical surface, can be from centering between sealed pad and the sealed pad holder, and the atress is even, further improves the durability, the assembly of also being convenient for simultaneously.

Preferably, the method is characterized in that: the gasket is compressively deformed in the first direction and the second direction at the annular contour at the same time.

In this scheme, sealed the pad takes place to warp at first direction and second direction simultaneously, has strengthened sealed the leakproofness of filling up in first direction and second direction, and sealed pad all has good leakproofness with the valve clack body on a plurality of directions, has strengthened holistic sealed effect.

Preferably, one side of the sealing gasket, which is close to the valve clack body, is provided with a shoulder, and the end face of the sealing gasket retainer, which is close to the valve clack body, abuts against the shoulder of the sealing gasket, so that the end face of the sealing gasket abuts against the valve clack body.

In this scheme, the annular flange specifically is the shoulder, and sealed the pad holder passes through terminal surface butt shoulder, utilizes the contact scheme of face and face, and the terminal surface of shoulder, sealed pad holder, the mutual butt of valve clack body three have guaranteed the effect that prevents to drop promptly, has produced sealed effect through the even compression between face and the face again.

Preferably, the gasket includes at least one first annular sealing portion where the gasket abuts the valve flap body, and the gasket is locally compressed.

In this scheme, sealed the pad through first annular seal portion and valve clack body butt, form high-pressure seal structure between first annular seal portion and the valve clack body, increased sealed the point between sealed pad and the valve clack body, be favorable to improving the sealed effect between sealed pad and the valve clack body.

Preferably, the valve flap body and the gasket retainer enclose a receptacle for receiving a gasket, the receptacle comprising a first reentrant corner of radius R1, the gasket comprising a first sharp corner of radius R1 in interference fit with the first reentrant corner, and R1< R1, the first sharp corner forming a first annular seal.

In this scheme, sealed first closed angle that fills up supports the first reentrant angle of holding portion, because R1< R1, the pointed portion of first closed angle is compressed, forms stronger compressive stress between first closed angle and the first reentrant angle, has increased the sealed degree between first closed angle and the first reentrant angle, reduces the risk that the fluid pierces through the clearance between first closed angle and the first reentrant angle.

Preferably, the accommodating portion includes an annular space, and the sealing gasket includes at least two first annular sealing portions respectively located at an inner circle and an outer circle of the annular space.

In this scheme, sealed the embedding in the annular space, form two first annular seal portions in the interior circle department and the excircle department of annular space respectively to strengthen sealed the leakproofness between sealed pad and the valve clack body, can reduce the condition that the one end of sealed pad holder was kept away from to the medium entering annular space, can improve the holistic leakproofness of valve clack.

Preferably, the receiving portion comprises an annular space, the at least one first annular sealing portion being located on a side of the annular space remote from the annular contour.

In this scheme, sealed the packing all forms local compression at annular profile department and first annular seal portion, all forms local cyclic annular strong seal at inside and outside both sides of annular space promptly, can reduce the condition that the medium gets into the one end that the annular space kept away from sealed packing retainer, can improve the holistic leakproofness of valve clack.

Preferably, the gasket includes at least one second annular sealing portion where the gasket abuts the gasket holder, and the gasket is locally compressed.

In this scheme, sealed through second annular sealing portion butt together between sealed pad and the sealed pad holder to form good sealed effect between sealed pad and the sealed pad holder, in addition, reach the equilibrium between the power of a plurality of directions that sealed pad was applyed to second annular sealing portion and first annular sealing portion, make sealed pad atress balanced, reduce local stress concentration.

Preferably, one side of the annular flange close to the gasket retaining member and the side surface of the gasket form a second reentrant corner with a radius R2, the gasket retaining member is provided with a second sharp corner matched with the second reentrant corner, the radius of the second sharp corner is R2, R2 is less than R2, and the second sharp corner forms a second annular sealing part.

In this scheme, the second closed angle butt of sealed pad holder is in sealed second reentrant angle of filling up, because R2< R2, the point portion of second closed angle is compressed, forms stronger compressive stress between second closed angle and the second reentrant angle, has increased the sealed degree between second closed angle and the second reentrant angle, reduces the risk that the fluid pierces through the clearance between second closed angle and the second reentrant angle.

Preferably, the valve clack body comprises an extension part and a fixing part, the extension part is arranged at one end of the fixing part, and the extension part is provided with a cylindrical outer contour; the sealing gasket is annular and is sleeved outside the extension part; the sealing gasket retainer is sleeved outside the sealing gasket and is hermetically connected with the fixing part.

In this scheme, because the extension is cylindric, extension side does not set up any arch, consequently sealed the pad can overlap outside the cylinder easily, has reduced the risk that the inner circle of sealed pad is extrudeed by the extension by force and leads to sealed pad inner circle local chipping or crackle.

Preferably, the valve clack body comprises an extension part and a fixing part, the extension part is arranged at one end of the fixing part, and the extension part is provided with a first annular bulge; the sealing gasket is annular and is sleeved outside the extension part, a second annular bulge facing to the first direction is arranged on the inner wall of the sealing gasket, and the first annular bulge abuts against the second annular bulge in the second direction; the sealing gasket retainer is sleeved outside the sealing gasket and is hermetically connected with the fixing part.

In this aspect, the first annular protrusion and the second annular protrusion cooperate with each other to enhance the effect of preventing the gasket from falling off in the direction opposite to the second direction.

Preferably, the at least one annular profile is located in a direction opposite to the second direction of the annular flange.

In this scheme, sealed the gasket holder through at least one annular profile to sealed the pad of packing in the second direction extrusion for when the sealed pad has the trend that drops along the opposite direction of second direction, the anti-drop effect of sealed pad has further been strengthened.

Preferably, the sealing gasket is annular, and a spare sealing element connected with the valve clack body is arranged in the center of the sealing gasket.

In the scheme, when the valve clack is used, if the sealing gasket fails due to some reason, such as excessive abrasion, corrosion, falling, burning, aging and the like, a spare sealing element arranged in the center of the sealing gasket is used for being matched with the valve seat to realize sealing.

A valve comprises the valve clack.

In this scheme, the valve has the valve body, and the valve body has the air inlet, and the valve clack is used for blockking up or opening the air inlet of valve body.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows: the sealing gasket retaining piece extrudes the sealing gasket in the first direction, the sealing gasket and the sealing gasket retaining piece are tightly abutted, and compression deformation is generated at the annular outline, so that compression stress is generated, fluid is difficult to pass through a gap between the sealing gasket and the sealing gasket retaining piece, and the sealing property of the valve clack is improved; meanwhile, the sealing gasket retaining piece supports against the annular flange in the second direction, when the sealing gasket tends to fall off, the sealing gasket retaining piece and the sealing gasket are more tightly supported, so that the risk that the sealing gasket falls off the valve clack body is reduced, and meanwhile, local compression deformation is generated at the supporting part, so that the sealing property of the valve clack is further improved; the invention simultaneously limits the sealing gasket in the first direction and the second direction, and the first direction and the second direction are mutually perpendicular, so that the sealing gasket can form sufficient sealing with the sealing gasket retainer in all directions, and even if inevitable media permeate into a gap between the sealing gasket and the valve clack body, the compression stress at the abutting part of the annular contour and/or the annular flange can also ensure the sealing performance as much as possible.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the valve flap of the present invention.

Fig. 2 is a schematic structural view of the valve flap body, the gasket, and the gasket holder after installation.

FIG. 3 is an enlarged view of a portion of the gasket of the present invention having rounded corners at the corners.

FIG. 4 is an enlarged partial view of the invention at a right angle at the sharp corner of the gasket.

Fig. 5 is a schematic diagram of the first included angle α and the second included angle β according to the present invention.

Fig. 6 is a schematic structural diagram of a second embodiment of the valve flap of the present invention.

Fig. 7 is a schematic structural diagram of an embodiment of the valve of the present invention.

Description of reference numerals:

valve clack body 10

Gasket 11

Gasket holder 12

Extension 13

Through hole 14

First smooth surface 15

Second smooth surface 16

Second curved surface 17

Third curved surface 18

Shoulder 19

First plane 20

Second plane 21

Accommodating groove 22

Inner wall 23

First annular projection 24

Second annular projection 25

Inlet 26

An outlet 27

Switch chamber 28

Diaphragm 29

Detailed Description

The present invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, but the present invention is not limited thereto.

Example one

Fig. 1 to 5 show a first embodiment of the valve flap of the present invention, as shown in fig. 1, the valve flap includes a valve flap body 10, a seal 11 and a seal retainer 12, the seal 11 is connected to the valve flap body 10 through the seal retainer 12, and the seal retainer 12 is connected to the valve flap body 10 in a sealing manner; the gasket 11 is at least partially in contact with the gasket holder 12, and the surface in contact includes an annular profile where the gasket 11 is pressed by the gasket holder 12, and compression deformation occurs at least in a first direction that is radial to the annular profile and away from the side of the gasket holder 12; the gasket 11 is provided with an annular flange facing in the opposite direction to the first direction, and the gasket holder 12 abuts against the annular flange to restrict at least the movement of the annular flange in the opposite direction to the second direction, which is normal to the plane in which the annular profile lies and is close to the side of the flap body 10.

In this example, the force of the valve flap body 10 and the gasket retainer 12 acting on the gasket 11 is greater than or equal to the force of the external fluid entering the gap between the three, preventing the external fluid from entering the gap between the three.

The gasket holder 12 presses the gasket 11 in the first direction, that is, in the embodiment, the radial direction of the gasket 11 from the outside to the inside, the gasket 11 and the gasket holder 12 are tightly abutted, and fluid is difficult to pass through a gap between the gasket 11 and the gasket holder 12, so that sealing between the gasket 11 and the gasket holder 12 is realized; meanwhile, the sealing gasket retainer 12 abuts against the annular flange in the second direction, namely the axial direction of the sealing gasket 11 in the embodiment, when the sealing gasket 11 tends to fall off, the abutting of the sealing gasket retainer 12 and the sealing gasket 11 is tighter, so that the risk that the sealing gasket 11 falls off the valve clack body 10 is reduced, meanwhile, local compression deformation is generated at the abutting part, and the sealing performance of the valve clack is further improved. Furthermore, since at least part of the gasket 11 is in contact with the fluid during use of the flap, in particular when the flap is used in high-pressure fluids, the pressure of the fluid may act on the gasket 11, which may cause a simultaneous deformation of the gasket 11 in the direction of the pressure and in a direction perpendicular to the pressure, which deformation may further increase the deformation of the gasket 11 at the annular contour and at the abutment of the annular flange, so as to improve the tightness of the flap in high-pressure fluids.

It should be noted that in other embodiments of the present application, the seal gasket holder, and the valve flap body may also take other forms, for example, the seal gasket is provided as a cylindrical body with an annular flange, the seal gasket holder abuts against a cylindrical body portion of the seal gasket radially inward of the seal gasket, and the seal gasket holder abuts the annular flange of the seal gasket against the valve flap body in the axial direction of the seal gasket. As long as the gasket holder can restrain the gasket in the above-described first and second directions, a corresponding technical effect can be achieved.

Preferably, the annular contour is a plurality of annular contours, a plurality of adjacent annular contours form a first curved surface, and the first curved surface is a continuous curved surface.

In this example, the gasket 11 and the gasket holder 12 are abutted by a plurality of annular profiles, and since the number of annular profiles is plural, the pressure between the gasket 11 and the gasket holder 12 is equalized, and at the same time, since the first curved surface is continuous, the contact surface between the gasket 11 and the gasket holder 12 is increased, and localized stress concentration between the gasket 11 and the gasket holder 12 can be reduced, thereby reducing the occurrence of a failure of the gasket due to localized stress excess at the time of assembly or in a high-pressure environment.

In other embodiments of the present application, the first curved surface may be a conical surface, a cylindrical surface, or a continuous smooth corrugated conical surface, and as long as a plurality of adjacent annular contours form a continuous first curved surface, the sealing performance can be improved, and meanwhile, the local stress concentration is reduced, thereby achieving a corresponding technical effect.

Preferably, the side of the gasket 11 adjacent to the first curved surface has a second curved surface 17, the side of the gasket holder 12 adjacent to the first curved surface has a third curved surface 18, and the second curved surface 17 abuts against the third curved surface 18 to form the first curved surface.

In this example, the first curved surface is generated by the second curved surface 17 of the gasket 11 abutting against the third curved surface 18 of the gasket holder 12 and being deformed accordingly, and it is only necessary to machine the second curved surface 17 and the third curved surface 18 as needed before assembly.

Preferably, the second curved surface 17 and the third curved surface 18 are both continuous curved surfaces.

In this example, such an arrangement can ensure as close as possible deformation of the gasket 11 and/or the gasket holder 12 at the first curved surface, ensuring both the sealing effect and reducing the risk of stress concentration.

As shown in fig. 5, preferably, the second curved surface 17 and the third curved surface 18 are conical surfaces, the second curved surface 17 forms a first included angle α with a normal of a plane in which the annular contour is located, the third curved surface 18 forms a second included angle β with a normal of a plane in which the annular contour is located, and the first included angle α is smaller than the second included angle β.

In this example, since the first included angle α is smaller than the second included angle β, the portion of the gasket 11 in contact with the gasket holder 12 is locally compressed excessively, that is, at least a part of the area is compressed more than other portions of the first curved surface, which contributes to further enhancing the sealing effect.

Preferably, the second curved surface 17 and the third curved surface 18 are conical surfaces, the second curved surface 17 forms a first included angle α with a normal of a plane where the annular contour is located, the third curved surface 18 forms a second included angle β with a normal of a plane where the annular contour is located, and the first included angle α is equal to the second included angle β.

In this example, the first angle α is equal to the second angle β, so that the gasket 11 and the gasket holder 12 are uniformly pressed, and the durability is improved, and since the second curved surface 17 and the third curved surface 18 are tapered surfaces, the gasket 11 and the gasket holder 12 can be self-centered and uniformly stressed, and the durability is further improved, and the assembly is also facilitated.

In specific implementation, the second curved surface 17 is an inner conical surface, the third curved surface 18 is an outer conical surface, and the gasket 11 and the gasket holder 12 move relatively under the guiding action of the second curved surface 17 and the third curved surface 18 during assembly until the assembly position is reached, and the gasket 11 deforms to form a first curved surface with local compression. The relation between the first included angle alpha and the second included angle beta can be set according to actual requirements. For example, the valve flap applied in a high-pressure environment of more than 10MPa can make the first included angle α smaller than the second included angle β to enhance the sealing effect, and meanwhile, due to the action of the second curved surface 17 and the third curved surface 18, the assembling effect can be ensured to a certain extent; the valve clack applied in normal pressure environment can lead the first included angle alpha to be equal to the second included angle beta, lead the deformation of the sealing gasket 11 and the sealing gasket retainer 12 at the first curved surface to be uniform, and simultaneously lead the sealing performance of the valve clack to be ensured to a certain extent because the first curved surface also has a local compression area.

Preferably, the gasket 11 undergoes compression deformation in the first direction and the second direction simultaneously at the annular contour.

In this example, the gasket 11 deforms in the first direction and the second direction simultaneously, the sealing performance of the gasket 11 in the first direction and the second direction is enhanced, and the gasket 11 and the valve flap body 10 have good sealing performance in multiple directions, so that the overall sealing effect is enhanced. With such an arrangement, particularly in a high-pressure environment, when the gasket 11 has a tendency to fall off, the direction of the fall-off is necessarily at least one of the direction opposite to the first direction or the direction opposite to the second direction, and once there is such a tendency, the compression deformation at the annular contour is further increased, so that the sealing effect at the annular contour is improved, and the possibility of the flap gasket falling off or the gasket loosening is reduced; on the other hand, when the valve flap is assembled, external force is applied to the sealing gasket retaining piece 12 along the first direction and/or the second direction, so that the sealing gasket 11 can be fixed, and the assembling difficulty is reduced.

As shown in fig. 1, it is preferable that the side of the gasket 11 close to the valve flap body 10 has a shoulder 19, the shoulder 19 of this example is one example of an annular flange, and the end surface of the gasket holder 12 close to the valve flap body 10 abuts against the shoulder 19 of the gasket 11, and the end surface of the gasket 11 abuts against the valve flap body 10.

Specifically, the shoulder 19 has a first flat surface 20, the gasket holder 12 has a second flat surface 21, and the gasket holder 12 abuts against the shoulder 19 of the gasket 11 so that the first flat surface 20 abuts against the second flat surface 21.

In this example, the annular flange is embodied as a shoulder 19, and the gasket holder 12 abuts the shoulder 19 by means of an end face, with a face-to-face contact solution, both ensuring the anti-falling effect and producing the sealing effect by means of a uniform compression between the faces.

Preferably, the gasket 11 comprises at least one first annular seal, where the gasket 11 abuts the flap body 10 and where the gasket 11 generates a local compression.

In this example, the sealing gasket 11 abuts against the valve flap body 10 through the first annular sealing portion, and a high-pressure sealing structure is formed between the first annular sealing portion and the valve flap body 10, so that a sealing point between the back surface of the sealing gasket 11 and the valve flap body 10 is increased, and the sealing effect between the sealing gasket 11 and the valve flap body 10 is further improved.

In other embodiments of the present application, the first annular seal may be created by any form of localized compression, such as providing an annular protrusion on the gasket 11, or providing an annular protrusion on the valve flap body 10 that cooperates with the gasket 11, where the gasket 11 creates a localized compression, thereby creating the first annular seal. The corresponding technical effect can be achieved as long as the sealing gasket 11 and the valve clack body 10 are matched to form an annular sealing part.

Preferably, the valve flap body 10 and the gasket retainer 12 enclose a housing for housing the gasket 11, the housing comprising a first reentrant corner having a radius R1, the gasket 11 comprising a first sharp corner having a radius R1 in interference fit with the first reentrant corner, and R1< R1, the first sharp corner forming a first annular seal.

As shown in fig. 3, in the present example, the housing groove 22 and the gasket retainer 12 enclose a housing portion for housing the gasket 11, and the first sharp corner of the gasket 11 abuts against the first reentrant corner of the housing groove 22, and since R1< R1, the tip of the first sharp corner is compressed, and a strong interaction force is formed between the first sharp corner and the first reentrant corner, which increases the degree of sealing between the first sharp corner and the first reentrant corner, and reduces the risk of fluid penetrating the gap between the first sharp corner and the first reentrant corner.

As shown in fig. 1 and 3, in the present embodiment, the gasket 11 includes two first annular seal portions.

Preferably, the receiving portion comprises an annular space, and one end of the annular space, which is away from the gasket holder 12, is provided with two first concave angles, which are located at the inner circle and the outer circle of the annular space, respectively.

In this example, the gasket 11 is embedded in the annular space, two first sharp corners of the gasket 11 abut against two first concave corners of the valve flap body 10, and two first annular sealing portions are formed at the inner circle and the outer circle of the annular space, respectively, so as to enhance the sealing performance between the gasket 11 and the valve flap body 10, reduce the situation that the medium enters the annular space and is far away from one end of the gasket holder 12, and improve the sealing performance of the whole valve flap. Specifically, once a medium enters the end of the annular space far from the gasket holder 12, on one hand, the medium generates pressure on the gasket 11, and the pressure gradually separates the gasket 11 from the valve flap body 10, thereby affecting the overall sealing performance of the valve flap, although the solution of the present embodiment has a local seal at the annular contour, the effect of the phenomenon on the sealing performance can be reduced to some extent, but the phenomenon can be further avoided or reduced by the above means, so that the gasket 11 operates in a better state, and particularly, in a high-pressure environment, such an arrangement has a certain positive effect on the overall sealing performance of the valve flap; on the other hand, the media remaining in the end of the annular space away from the gasket holder 12 may affect the durability of the seal ring, for example, hydrogen gas remains in the above-mentioned area, and the valve flap body is made of a metal material, so that the occurrence of hydrogen embrittlement may degrade the mechanical properties of the valve flap body, and such an arrangement can avoid or reduce the occurrence of the above-mentioned phenomenon.

In other embodiments of the present application, the sealing gasket 11 may also form the two first annular sealing portions in other forms, as long as the two first annular sealing portions are respectively disposed at the inner circle and the outer circle of the annular space, and the above technical effects can be achieved by reducing the medium residue.

Preferably, the receptacle comprises an annular space, the at least one first annular seal being located on a side of the annular space remote from the annular profile.

Through such setting, sealed 11 all forms the local compression at annular profile department and first annular seal portion, all form local annular strong seal at the inside and outside both sides of annular space promptly, also can reduce the condition that the medium gets into the one end that the annular space kept away from sealed retainer 12, compare with above-mentioned two first annular seal portions of setting up in interior circle and excircle department, such scheme can make full use of sealed 11 local compression at annular profile department, the quantity of local compression has been reduced, the structure of valve clack has been simplified, the risk that sealed 11 destroyed appears in the assembly process has been reduced.

In this embodiment, the side of the valve flap body 10 close to the gasket 11 is recessed inward to form a receiving groove 22, and the shoulder 19 of the gasket 11 is fitted into the receiving groove 22.

In particular embodiments, the thickness T of the shoulder 19 is greater than the depth T of the receiving slot 22, such that the shoulder 19 protrudes from the receiving slot 22.

In the above embodiment, since the shoulder 19 projects from the housing groove 22, the end surface of the packing retainer 12 is ensured to abut against the shoulder 19; with the increase of the thickness of the shoulder 19, the shoulder 19 has better pressure resistance and can bear larger extrusion force, so that the end face of the sealing gasket 11 is more tightly combined with the end face of the valve clack body 10, and the sealing performance between the two is further improved.

Preferably, the gasket 11 comprises at least one second annular sealing portion where the gasket 11 abuts the gasket holder 12 and where the gasket 11 is locally compressed.

As shown in fig. 3, in the present embodiment, the gasket 11 has one second annular seal portion.

In this example, the gasket 11 and the gasket holder 12 are abutted together by the second annular sealing portion, so that a good sealing effect is formed between the gasket 11 and the gasket holder 12, and further, the forces in multiple directions applied to the gasket 11 by the second annular sealing portion and the first annular sealing portion are balanced, so that the stress on the gasket 11 is balanced, and the local stress concentration is reduced.

Preferably, one side of the annular flange close to the gasket holder 12 forms a second reentrant corner with a radius R2 with the side of the gasket 11, the gasket holder 12 is provided with a second cusp matching the second reentrant corner, the radius of the second cusp is R2, and R2< R2, the second cusp forming a second annular sealing portion.

In this example, the second sharp corner of the gasket retainer 12 abuts against the second reentrant corner of the gasket 11, and since R2< R2, the tip of the second sharp corner is compressed, creating a stronger interaction force between the second sharp corner and the second reentrant corner, increasing the degree of sealing between the second sharp corner and the second reentrant corner, reducing the risk of fluid penetrating the gap between the second sharp corner and the second reentrant corner.

Preferably, the flap body 10 includes an extension portion 13 and a fixing portion, the extension portion 13 is disposed at one end of the fixing portion, and the extension portion 13 has a cylindrical outer profile; the sealing gasket 11 is annular and is sleeved outside the extension part 13; the gasket holder 12 is fitted around the gasket 11 and is hermetically connected to the fixing portion.

In this embodiment, as shown in FIG. 3, the first sharp angles and the second sharp angles are rounded.

In other embodiments, as shown in FIG. 4, both the first and second sharp angles are sharp angles, and specifically a right angle, an obtuse angle or an acute angle may be used, i.e., the radius r1 of the first sharp angle and the radius r2 of the second sharp angle may be 0. When r1 or r2 is 0, the gasket 11 generates a large stress concentration at a sharp corner, and a good sealing effect can be generated; when r1 or r2 is not 0, the gasket 11 can realize self-centering by using the guide effect of the fillet during assembly, the requirement on the assembly process is reduced, and meanwhile, the sealing performance can be ensured due to the matching of the sharp corner and the concave corner. In implementing the solution of the present application, the sizes of R1 and R2 can be selected as needed, and as long as the relationship of R1< R1 and/or R2< R2 is satisfied, the corresponding technical effects can be achieved.

It should be noted that, in other embodiments of the present application, R1 and R2 may also be infinite, and similarly, as long as the radii of the sharp corner and the reentrant corner satisfy the above relationship, the corresponding technical effect can be achieved.

As shown in fig. 1 and fig. 2, in this example, the sealing gasket 11 has a through hole 14, and since the extension 13 is cylindrical and no protrusion is provided on the side of the extension 13, the through hole 14 of the sealing gasket 11 can easily be sleeved outside the cylinder, thereby reducing the risk of local chipping or cracking of the inner ring of the sealing gasket 11 caused by the inner ring of the sealing gasket 11 being forcibly pressed by the extension 13.

In other embodiments, the cylindrical extension 13 has a first smooth surface 15, the inner wall of the through hole 14 of the gasket 11 has a second smooth surface 16, and when the extension 13 is inserted into the through hole 14, the first smooth surface 15 and the second smooth surface 16 slide relatively with a small resistance, so as to reduce the resistance of the extension 13 to be inserted into the through hole 14.

In other embodiments, the end of the extension 13 has a first guiding angle, and the opening edge of the through hole 14 has a second guiding angle, and the first guiding angle and the second guiding angle cooperate with each other to smoothly guide the extension 13 into the through hole 14.

In other embodiments, a plurality of grooves or score lines may be formed on the side wall of the extension 13, the gasket 11 is sleeved outside the extension 13, and the gasket holder 12 abuts the gasket 11 on the extension 13 to form a partial compression. As long as extension 13 has cylindric external profile, sealed 11 can locate the extension 13 outside by the cover, the homoenergetic realizes the convenient assembly, reduces the technical effect that the piece or the crackle appear in the assembling process risk.

Preferably, the at least one annular profile is located in a direction opposite to the second direction of the annular flange.

In this example, the gasket holder 12 presses the gasket 11 in the second direction, i.e., the axial direction, by at least one annular contour, so that the gasket 11 tends to fall off in the direction opposite to the second direction, further enhancing the anti-drop effect of the gasket 11. Specifically, when the gasket 11 falls off in the direction opposite to the second direction, the gasket 11 is firstly abutted by the gasket holder 12, if the abutting force of the gasket holder 12 is not enough to overcome the force for falling off the gasket 11, the gasket 11 continuously moves in the direction opposite to the second direction, at this time, the pressure at the annular contour makes the gasket 11 and the gasket holder 12 tightly fit to avoid the falling off of the gasket 11, for any section of the gasket 11, the pressure and the abutting force at the annular contour respectively generate a moment on the gasket 11, that is, because the stress points are different, the gasket 11 generates a tendency of rotating in the direction of the force, and the moment directions of the two are opposite, and can be balanced with each other when the pressure is low, and most of the moment can be balanced when the pressure is high.

Compared to the annular profile provided at the annular flange, since the gasket 11 is abutted between the valve flap body 10 and the gasket holder 12, the valve flap body 10 and/or the gasket holder 12 can apply reaction forces to the gasket 11 at a plurality of positions, thereby balancing the above-described moment. In this arrangement, the moment generated by the pressure in the first direction and the moment generated by the pressure in the second direction applied to the gasket 11 can be balanced with each other, so that the sealing effect can be ensured, the pressure in other areas of the gasket 11 is not generated, and the durability can be improved to a certain extent.

Example two

Fig. 6 shows a second embodiment of the valve flap according to the invention, which has most of its features in accordance with the first embodiment, and which has the following features:

in this embodiment, the extending portion 13 of the valve flap body 10 has a first annular protrusion 24 on the side, the through hole 14 of the gasket 11 has a second annular protrusion 25 facing the first direction, and the first annular protrusion 24 catches the second annular protrusion 25. With this arrangement, the first annular projection 24 and the second annular projection 25 are engaged with each other, whereby the gasket 11 is prevented from falling off in the direction opposite to the second direction. In addition, when the valve flap is applied to high-pressure fluid, the pressure of the fluid acts on the gasket 11, the gasket 11 deforms perpendicular to the pressure direction, the deformation causes the shoulder portion of the gasket 11 to abut against the inner wall 23 of the gasket holder 12 outwards, and causes the second annular protrusion 25 of the gasket 11 to abut against the extension portion 13 inwards, and as the fluid pressure increases, the deformation continuously increases, and the gasket 11 can be locally compressed at the inner wall 23 and the extension portion 13, so that the sealing effect is further enhanced, and the effect of preventing the gasket 11 from falling off, which is caused by the gasket holder 12 and the first annular protrusion 24, is enhanced.

Preferably, the gasket holder 12 is connected to the valve flap body 10 by welding to ensure a hermetic seal. In other embodiments of the present application, the gasket holder 12 and the valve flap body 10 may also adopt other sealing connection forms, such as fusion connection, connection by sealant, connection by airtight thread, etc., as long as the sealing performance of the connection part can be ensured.

Preferably, the packing 11 is ring-shaped, and a spare seal connected to the valve flap body 10 is provided at the center of the packing 11. In this embodiment, the extension 13 of the flapper body 10 is a backup seal. In other embodiments, the spare seal may be provided in other forms according to actual needs.

With the arrangement, when the valve flap is used, if the sealing gasket 11 fails due to some reason, such as excessive abrasion, corrosion, falling, burning, aging and the like, a spare sealing element arranged in the center of the sealing gasket 11 can be used for matching with the valve seat to realize sealing, so that the loss caused by the failure of the sealing gasket 11 is reduced.

EXAMPLE III

Fig. 7 shows an embodiment of the valve of the present invention.

A valve comprises the valve clack.

In this example, the valve has a valve body having an inlet 26 and an outlet 27, a switching chamber 28 is provided between the inlet 26 and the outlet 27, a valve flap is movably provided in the switching chamber 28 for blocking or unblocking the inlet 26 of the valve body, and a seal 11 of the valve flap is in contact with the valve body to achieve a line seal or a surface seal.

In specific implementation, the upper end of the valve flap is connected with a diaphragm 29, and the edge of the diaphragm 29 is hermetically connected with the inner wall of the switch cavity 28.

When the valve is in operation, when the valve clack is far away from the inlet 26 of the valve body, gas enters the switch cavity 28 through the inlet 26, the diaphragm 29 plays a role of sealing the switch cavity 28, and the gas flows out through the outlet 27; when the valve flap moves to abut against the valve body, the sealing gasket 11 blocks the inlet 26, and the effect of closing the valve is realized.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (19)

1. A valve flap comprising a valve flap body, a gasket and a gasket retainer, the gasket being connected to the valve flap body by the gasket retainer, characterized in that:

the sealing gasket retainer is hermetically connected with the valve clack body;

the gasket is at least partially in contact with the gasket holder, and the contact surface includes an annular profile at which the gasket is pressed by the gasket holder, and compressive deformation occurs at least in a first direction that is a radial direction of the annular profile and is away from a side of the gasket holder;

the gasket is provided with an annular flange facing in the opposite direction to the first direction, and the gasket holder abuts against the annular flange to at least restrict movement of the annular flange in a direction opposite to a second direction which is normal to a plane in which the annular contour is located and which is close to a side of the valve flap body.

2. The valve flap of claim 1, wherein: the annular profiles are multiple, the adjacent annular profiles form a first curved surface, and the first curved surface is a continuous curved surface.

3. The valve flap of claim 2, wherein: one side of the sealing gasket, which is close to the first curved surface, is provided with a second curved surface, one side of the sealing gasket holder, which is close to the first curved surface, is provided with a third curved surface, and the second curved surface is abutted against the third curved surface to form the first curved surface.

4. The valve flap of claim 3, wherein: the second curved surface and the third curved surface are both continuous curved surfaces.

5. The valve flap of claim 4, wherein: the second curved surface and the third curved surface are conical surfaces, a first included angle alpha is formed between the second curved surface and the normal line of the plane where the annular outline is located, a second included angle beta is formed between the third curved surface and the normal line of the plane where the annular outline is located, and the first included angle alpha is smaller than the second included angle beta.

6. The valve flap of claim 4, wherein: the second curved surface and the third curved surface are conical surfaces, a first included angle alpha is formed between the second curved surface and a normal line of a plane where the annular outline is located, a second included angle beta is formed between the third curved surface and the normal line of the plane where the annular outline is located, and the first included angle alpha is equal to the second included angle beta.

7. The valve flap of any of claims 1-6, wherein: the gasket is simultaneously compressively deformed in the first and second directions at the annular profile.

8. The valve flap of claim 1, wherein: the sealing gasket is provided with a shoulder part at one side close to the valve clack body, the end face of the sealing gasket retainer close to the valve clack body is abutted against the shoulder part of the sealing gasket, and the end face of the sealing gasket is abutted against the valve clack body.

9. The valve flap of claim 1, wherein: the sealing gasket at least comprises a first annular sealing part, the sealing gasket is abutted with the valve clack body at the first annular sealing part, and the sealing gasket generates local compression at the first annular sealing part.

10. The valve flap of claim 9, wherein: the valve clack body with the sealed packing retainer surrounds and forms and is used for holding sealed packing's accommodation portion, accommodation portion includes that the radius is R1's first reentrant angle, sealed packing include with first reentrant angle interference fit's radius is R1's first closed angle to R1< R1, first closed angle forms first annular sealing portion.

11. The valve flap of claim 9, wherein: the valve clack body with sealed the surrounding formation of packing retainer is used for holding sealed the portion of holding of packing, the portion of holding includes annular space, sealed the packing includes two at least first annular seal portion is located respectively annular space's interior circle and excircle department.

12. The valve flap of claim 9, wherein: the valve clack body and the sealing gasket retainer surround to form a containing part for containing the sealing gasket, the containing part comprises an annular space, and at least one first annular sealing part is positioned on one side, away from the annular contour, of the annular space.

13. The valve flap of claim 1, wherein: the gasket includes at least one second annular sealing portion where the gasket abuts the gasket holder and where the gasket is locally compressed.

14. The valve flap of claim 13, wherein: the annular flange is close to one side of the sealing gasket retaining piece and the side face of the sealing gasket forms a second reentrant angle with the radius of R2, the sealing gasket retaining piece is provided with a second sharp corner matched with the second reentrant angle, the radius of the second sharp corner is R2, and R2 is less than R2, and the second sharp corner forms the second annular sealing part.

15. The valve flap of claim 1, wherein: the valve clack body comprises an extension part and a fixing part, the extension part is arranged at one end of the fixing part, and the extension part is provided with a cylindrical outer contour; the sealing gasket is annular and is sleeved outside the extension part; the sealing gasket retainer is sleeved outside the sealing gasket and is hermetically connected with the fixing part.

16. The valve flap of claim 1, wherein: the valve clack body comprises an extension part and a fixing part, the extension part is arranged at one end of the fixing part, and the extension part is provided with a first annular bulge; the sealing gasket is annular and is sleeved outside the extension part, a second annular bulge facing to the first direction is arranged on the inner wall of the sealing gasket, and the first annular bulge abuts against the second annular bulge in the second direction; the sealing gasket retainer is sleeved outside the sealing gasket and is hermetically connected with the fixing part.

17. The valve flap of claim 1, wherein: at least one of the annular profiles is located in a direction opposite to the second direction of the annular flange.

18. The valve flap of claim 1, wherein: the sealing gasket is annular, and a spare sealing element connected with the valve clack body is arranged in the center of the sealing gasket.

19. A valve, characterized by: the valve comprises a flap according to any of claims 1-18.

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