阅读说明：本技术 一种阀门用密封结构 (Sealing structure for valve ) 是由 郑安力 王海龙 吴慧娟 赵玉峰 于 2021-09-10 设计创作，主要内容包括：本发明涉及阀门技术领域,尤其涉及一种阀门用密封结构,包括：固定在阀体上的第一阀座；套设在第一阀座上的第二阀座,第一阀座朝向第二阀座的端面上具有朝向第二阀座开口的V型环槽；与第二阀座对接的笼套,沿笼套内可往复运动的阀芯,阀芯的外径略小于笼套的内径；其中,V型环槽最内侧的径向的距离小于第二阀座的内径,V型环槽内具有三角形密封圈,阀芯朝向第一阀座移动时,阀芯的倒平角处与三角形密封圈接触,形成一道密封副,阀座与笼套装配后形成的密封槽内具有组合式密封件,形成两道密封副。本发明三角形密封圈的锥面与阀芯的端部倒平角面相接,同时阀芯外环面与组合式密封件相接触,阀芯在闭合时形成两道密封结构,提高了密封可靠性。(The invention relates to the technical field of valves, in particular to a sealing structure for a valve, which comprises: a first valve seat fixed to the valve body; the end face, facing the second valve seat, of the first valve seat is provided with a V-shaped annular groove facing the opening of the second valve seat; the valve core can reciprocate along the inside of the cage sleeve, and the outer diameter of the valve core is slightly smaller than the inner diameter of the cage sleeve; the valve core is arranged in the V-shaped ring groove, the radial distance of the innermost side of the V-shaped ring groove is smaller than the inner diameter of the second valve seat, a triangular sealing ring is arranged in the V-shaped ring groove, when the valve core moves towards the first valve seat, the inverted flat angle of the valve core is in contact with the triangular sealing ring to form a sealing pair, and a combined sealing element is arranged in a sealing groove formed after the valve seat and the cage sleeve are assembled to form two sealing pairs. The conical surface of the triangular sealing ring is connected with the inverted flat angular surface at the end part of the valve core, and the outer annular surface of the valve core is contacted with the combined sealing element, so that two sealing structures are formed when the valve core is closed, and the sealing reliability is improved.)

1. A sealing structure for a valve, comprising:

a first valve seat;

the first valve seat is sleeved with the second valve seat, a first sealing ring is arranged on the radial inner wall of the second valve seat, which is in contact with the first valve seat, and a V-shaped annular groove which is opened towards the second valve seat is arranged on the end face, facing the second valve seat, of the first valve seat;

the inner diameter of the inner wall of the cage is the same as that of the inner wall of the second valve seat, and the inner diameter of the first valve seat is smaller than that of the second valve seat;

the valve core is movably arranged in the cage, the outer diameter of the valve core is slightly smaller than the inner diameter of the cage, and the outer diameter of the valve core is larger than the inner diameter of the first valve seat;

and when the valve core moves towards the first valve seat, the valve core is contacted with the triangular second sealing ring to realize sealing.

2. The seal structure for a valve according to claim 1, wherein an end surface of the second valve seat facing the first valve seat is opposed to an opening side of the V-shaped ring groove, and the end surface of the second valve seat and the V-shaped ring groove form an open triangular groove ring structure.

3. The sealing structure for the valve according to claim 2, wherein one corner of the triangular sealing ring protrudes from the opening of the open triangular ring groove, and an included angle of 20-45 ° is formed between the opening direction of the open triangular ring groove and the axial direction of the valve element.

4. The seal structure for a valve according to claim 1, wherein a phase cut surface is provided on the inner wall of the first valve seat near the V-shaped opening, and the phase cut surface is arranged in parallel with a chamfered outer wall of the valve body on the side near the first valve seat.

5. The seal structure for a valve according to claim 4, wherein the first valve seat further has a first passage on an inner wall thereof, the first passage being provided in communication with a bottom of the V-shaped ring groove.

6. The seal structure for a valve according to claim 1, wherein a second seal structure is further provided on an end surface of the second valve seat that is in butt joint with the cage, the second seal structure includes a second seal groove formed by the second valve seat and the end surface of the cage, and a second seal ring disposed in the second seal groove, an inner wall of the second seal ring protrudes from an inner wall of the second valve seat and the cage, and when the spool moves toward the first valve seat, an inner wall of the second seal ring radially contacts an outer wall of the spool.

7. The seal structure of claim 6, wherein the cross section of the second seal groove is of a "convex" shape, the throat is disposed radially inward, the second seal ring is of a "convex" shape, and the depth of the throat of the second seal ring is greater than the depth of the throat of the second seal groove.

8. The sealing structure of claim 7, wherein the depth of the second sealing groove is greater than the depth of the second sealing ring, and a circular sealing ring is further disposed in the second sealing groove and surrounds the outer wall of the second sealing ring.

9. The sealing structure for the valve according to claim 8, wherein the second sealing ring is recessed in the middle of the surface of the second sealing ring contacting the circular sealing ring for positioning the circular sealing ring.

10. The seal structure for a valve according to claim 6, wherein the cage inner wall further has a second passage provided in communication with a bottom of the second seal groove.

11. The sealing structure for the valve according to claim 9, wherein the second sealing structure is provided on a valve core, the valve core includes a core body and an end cap fixed to a free end of the core body, a joint of the end cap and the core body forms a fixing cavity of the second sealing ring and the circular sealing ring, and the fixing cavity is open toward an outer wall of the core body.

Technical Field

The invention relates to the technical field of valves, in particular to a sealing structure for a valve.

Background

The valve is a pipeline accessory used for opening and closing a pipeline, controlling the flow direction, adjusting and controlling parameters of a conveying medium, the sealing performance of the valve is one of basic parameters considering the performance of the valve, however, the problem of sealing failure of the valve caused by scratching of the surface of a valve core exists in the prior art.

In the related art, in order to avoid the problem of sealing failure caused by damaged surface of the valve element, a flat end face sealing structure is adopted, however, the flat end face sealing structure can cause the valve element to generate unbalanced force, so that the control precision of the valve is reduced, the load of the actuating mechanism is increased, and the problem of larger type selection of the actuating mechanism is caused.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: a sealing structure for a valve is provided to solve the problem of leakage caused by scratches on the surface of a valve element.

In order to achieve the purpose, the invention adopts the technical scheme that: a sealing structure for a valve, comprising:

a first valve seat;

the first valve seat is sleeved with the second valve seat, a first sealing ring is arranged on the radial inner wall of the second valve seat, which is in contact with the first valve seat, and a V-shaped annular groove which is opened towards the second valve seat is arranged on the end face, facing the second valve seat, of the first valve seat;

the inner diameter of the inner wall of the cage is the same as that of the inner wall of the second valve seat, and the inner diameter of the first valve seat is smaller than that of the second valve seat;

the valve core is movably arranged in the cage, the outer diameter of the valve core is slightly smaller than the inner diameter of the cage, and the outer diameter of the valve core is larger than the inner diameter of the first valve seat;

and when the valve core moves towards the first valve seat, the valve core is contacted with the triangular sealing ring to realize sealing.

Further, the end surface of the second valve seat facing the first valve seat is opposite to the opening side of the V-shaped ring groove, and the end surface of the second valve seat and the V-shaped ring groove form an open triangular groove ring structure.

Furthermore, one of the angles of the triangular sealing ring is arranged at the position of the opening of the triangular opening ring groove in a protruding mode, and the opening direction of the triangular opening ring groove and the axial direction of the valve core form an included angle of 20-45 degrees.

Furthermore, the inner wall of the first valve seat close to the V-shaped opening is provided with a tangent plane, and the tangent plane is parallel to the outer wall of the inverted flat angle of the valve core close to the first valve seat.

Furthermore, a first channel is further arranged on the inner wall of the first valve seat, and the first channel is communicated with the bottom of the V-shaped ring groove.

Further, the second valve seat with still have the second seal structure on the terminal surface that the cage overlaps the butt joint, the second seal structure include by the second valve seat with the second seal groove that the cage overlaps the terminal surface and setting up and be in the second sealing washer in the second seal groove, the inner wall protrusion of second sealing washer in the second valve seat with the inner wall setting of cage, and when the case moves towards first valve seat direction, the inner wall of second sealing washer radially with the outer wall contact of case.

Further, the cross section of the second sealing groove is of a convex structure, a necking part is arranged on the radial inner side, the second sealing ring is of a convex structure, and the depth of the necking part of the second sealing ring is larger than that of the necking part of the second sealing groove.

Furthermore, the depth of the second sealing groove is greater than that of the second sealing ring, a circular sealing ring is further arranged in the second sealing groove, and the circular sealing ring is wound on the outer wall of the second sealing ring.

Furthermore, on the surface of the second sealing ring, which is in contact with the circular sealing ring, the middle of the second sealing ring is concavely arranged and used for positioning the circular sealing ring.

Further, the inner wall of the cage sleeve is also provided with a second channel, and the second channel is communicated with the bottom of the second sealing groove.

Further, the second sealing structure is arranged on the valve core, the valve core comprises a core body and an end cover fixed to the free end of the core body, a fixed cavity of the second sealing ring and the circular sealing ring is formed at the joint of the end cover and the core body, and the fixed cavity is opened towards the outer wall of the core body.

The invention has the beneficial effects that: according to the invention, the triangular sealing ring is arranged in the V-shaped ring groove through the end chamfer of the valve core and in the direction of the first valve seat towards the second valve seat, so that the conical surface of the triangular sealing ring is connected with the end chamfer surface of the valve core, and when the chamfer surface of the valve core is contacted with the conical surface of the triangular sealing ring in the moving process of the valve core towards the first valve seat, the contact tightness is higher, the deformation degree of the triangular sealing ring is higher, the sealing area is larger, and compared with the prior art, the sealing reliability is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a sealing structure for a valve according to a first embodiment of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1 according to one embodiment of the present invention;

FIG. 3 is a schematic structural view of a valve core contacting a triangular sealing ring according to a first embodiment of the present invention;

FIG. 4 is a schematic view of a V-shaped groove on a first valve seat according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a valve sealing structure according to a second embodiment of the present invention;

FIG. 6 is an enlarged view of a portion B of FIG. 5 according to a second embodiment of the present invention;

FIG. 7 is a schematic structural view of a second embodiment of the present invention, illustrating the valve core in contact with a second seal ring;

fig. 8 is a schematic view illustrating an installation structure of a second seal ring and a circular seal ring according to a second embodiment of the present invention;

fig. 9 is an exploded view of the structure of the sealing structure for a valve according to the second embodiment of the present invention;

fig. 10 is a schematic structural view of a second seal structure in the third embodiment of the invention;

fig. 11 is a partial enlarged view of fig. 10 at C in the third embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example one

The sealing structure for a valve shown in fig. 1 to 4 includes a first valve seat 10, a second valve seat 20, a cage 30, a valve core 40, and a triangular sealing ring 50, wherein:

the first valve seat 10 is fixed on the valve body, and the first valve seat 10 is in a step ring structure; it should be noted that the first valve seat 10 is of a tubular structure as a whole, and the stepped annular structure means that an annular step for installing the second valve seat 20 is cut on the outer wall in the direction close to the second valve seat 20; the stepped annular structure is a structural form that the first valve seat 10 and the second valve seat 20 are installed in the embodiment of the invention, and the first valve seat 10 and the second valve seat 20 can also be fixed in other forms, such as welding;

the second valve seat 20 is sleeved on the first valve seat 10, a first sealing ring 21 is arranged on the radial inner wall of the second valve seat 20, which is contacted with the first valve seat 10, and the first sealing ring 21 is arranged on the contact surface of the first valve seat 10 and the second valve seat 20 to form a sealing structure between the first valve seat 10 and the second valve seat 20; the medium flows from the cavity formed inside the first valve seat 10 and the second valve seat 20; as shown in fig. 2, the end surface of the first valve seat 10 facing the second valve seat 20 has a V-shaped ring groove 11 opening to the second valve seat 20, the V-shaped ring groove 11 serving to seat a triangular sealing ring 50.

The cage 30 is butted with the second valve seat 20, the inner diameter of the inner wall of the cage 30 is the same as that of the inner wall of the second valve seat 20, and the inner diameter of the first valve seat 10 is smaller than that of the second valve seat 20; thus, the cavity formed by the cage 30 and the second valve seat 20 forms a chamber in which the valve core 40 moves left and right, and when the valve core 40 moves to the position of the first valve seat 10, because the inner diameter of the first valve core 40 is smaller than the inner diameter of the second valve seat 20, the valve core 40 cannot move continuously in the direction of the first valve seat 10;

the outer diameter of the valve core 40 is slightly smaller than the inner diameter of the cage 30, and the outer diameter of the valve core 40 is larger than the inner diameter of the first valve seat 10; it should be noted that slightly smaller means that the outer diameter of the valve core 40 is smaller than the clearance between the cage 30 and the second valve seat 20, and the clearance allows the valve core 40 to move axially between the two, but does not cause the triangular sealing ring 50 to lose the sealing function because the clearance is too large;

as shown in fig. 3, the distance in the radial direction of the innermost side of the V-shaped groove 11 is smaller than the inner diameter of the second valve seat 20, the triangular seal ring 50 is disposed in the V-shaped groove 11, the valve element 40 is disposed close to the chamfered corner of the outer wall on the side of the first valve seat 10, and the chamfered corner of the valve element 40 contacts the triangular seal ring 50 when the valve element 40 moves toward the first valve seat 10. When the valve core 40 moves towards the first valve seat 10, the outer wall of the chamfer angle firstly contacts with a taper angle of the triangular sealing ring 50 to form a sealing structure, and the contact area of the triangular sealing ring 50 and the chamfer angle surface is larger along with the continuous movement of the valve core 40 towards the first valve seat 10, so that the sealing structure with the sealing surface being variable is formed; thus, even if the surface of the valve element 40 is scratched, as long as the scratch distance is not greater than the maximum sealing area of the variable sealing surface, leakage of the valve element 40 is not caused; it should be noted here that when the valve core 40 moves toward the triangular sealing ring 50, the end of the valve core 40 contacts with the tapered surface of the triangular sealing ring 50 to seal the valve core 40, and in order to enlarge the contact area, in the embodiment of the present invention, the end of the valve core 40 is chamfered, so that the sealing effect is further improved.

In the above embodiment, the end portion of the valve element 40 is chamfered, and the V-shaped ring groove 11 is formed in the direction from the first valve seat 10 toward the second valve seat 20, and the triangular seal ring 50 is disposed in the V-shaped ring groove 11, so that the tapered surface of the triangular seal ring 50 is in contact with the end portion chamfered surface of the valve element 40, and when the chamfered surface of the valve element 40 is in contact with the tapered surface of the triangular seal ring 50 during the movement of the valve element 40 toward the first valve seat 10, the contact tightness is higher, the deformation degree of the triangular seal ring 50 is larger, and the sealing area is larger, thereby improving the sealing reliability compared with the prior art.

On the basis of the above-described embodiment, in order to better achieve the fixation of the triangular seal ring 50, as shown in fig. 3 or fig. 4, the end surface of the second valve seat 20 facing the first valve seat 10 is opposite to the opening side of the V-shaped ring groove 11, and the end surface of the second valve seat 20 and the V-shaped ring groove 11 form an open triangular groove ring structure. Through the arrangement, the end faces of the V-shaped ring groove 11 and the second valve seat 20 form the triangular sealing groove, so that the triangular sealing ring 50 is conveniently fixed, the problem that the triangular sealing ring 50 is distorted when the valve core 40 is in contact with the triangular sealing ring 50 is solved, and the sealing reliability is ensured.

Referring to fig. 4, in the embodiment of the present invention, one corner of the triangular sealing ring 50 protrudes from the opening of the opening triangular ring groove, and the opening direction of the opening triangular ring groove forms an included angle of 20 to 45 degrees with the axial direction of the valve core 40. In the preferred embodiment of the present invention, the opening direction of the opening triangular ring groove is set to 45 degrees, so as to realize uniform stress on both sides of the conical surface and improve the service life of the triangular sealing ring 50.

In addition, in the embodiment of the present invention, in order to appropriately extend the moving distance of the valve element 40, as shown in fig. 3 and 4, the inner wall of the first valve seat 10 near the V-shaped opening has the tangent plane 12, and the tangent plane 12 is disposed in parallel with the chamfered outer wall of the valve element 40 on the side near the first valve seat 10. Through the parallel arrangement of the phase tangent plane 12 and the inverted flat angle surface of the valve core 40, the moving distance of the valve core 40 is increased, and the sealing capability of the valve core 40 at the triangular sealing ring 50 is enhanced.

Further, as shown in fig. 4, in order to achieve the balance of the forces inside and outside the triangular sealing ring 50, the inner wall of the first valve seat 10 is further provided with a first passage 13, and the first passage 13 is communicated with the bottom of the V-shaped ring groove 11. Thus, when the fluid pressure in the valve body is high, the pressure inside and outside the V-shaped ring groove 11 can be equalized, and the influence of the pressure on the triangular seal ring 50 can be reduced.

Example two

On the basis of the first embodiment, a second sealing structure is further added in the second embodiment of the present invention, as shown in fig. 5 to 9, a second sealing structure is further provided on an end surface where the second valve seat 20 and the cage 30 are abutted, the second sealing structure includes a second sealing groove 31 formed by the end surfaces of the second valve seat 20 and the cage 30 and a second sealing ring 32 disposed in the second sealing groove 31, an inner wall of the second sealing ring 32 is disposed to protrude from inner walls of the second valve seat 20 and the cage 30, and when the valve core 40 moves toward the direction of the first valve seat 10, the inner wall of the second sealing ring 32 contacts with an outer wall of the valve core 40 in a radial direction. The second seal is formed on the radial side wall of the valve core 40 by the second seal structure, so that the sealing performance of the valve core 40 is further improved.

Specifically, as shown in fig. 6 and 7, the cross section of the second seal groove 31 is of a "convex" structure, the necking portion is disposed on the radial inner side, the second seal ring 32 is of a "convex" structure, and the depth of the necking portion of the second seal ring 32 is greater than that of the necking portion of the second seal groove 31. The second sealing ring 32 can be well fixed in the mode, the second sealing ring 32 is prevented from displacing in the axial direction of the valve core 40, the second sealing groove 31 formed between the second valve seat 20 and the cage 30 facilitates the installation of the second sealing ring 32, the second sealing ring 32 is only required to be placed in the second sealing groove 31 before the second valve seat 20 and the cage 30 are installed, and due to the detachable installation of the second valve seat 20 and the cage 30, the replacement and maintenance of the second sealing ring 32 are facilitated. It should be noted that, as shown in fig. 8, the top of the second sealing ring 32 is an arc surface, which can reduce the influence on the movement of the valve core 40 and achieve good contact.

In the embodiment of the present invention, in order to improve the degree of variability of the second seal ring 32 in the radial direction, as shown in fig. 7, the depth of the second seal groove 31 is greater than the depth of the second seal ring 32, and a circular seal ring 33 is further disposed in the second seal groove 31, and the circular seal ring 33 is wound around the outer wall of the second seal ring 32. Through the setting of circular seal ring 33, when second sealing washer 32 takes place to warp, circular seal ring 33 can take place further deformation to form elastic support to second sealing washer 32, further improve the variability degree and the life of second sealing washer 32.

Further, in order to improve the positioning reliability of the second seal ring 32 and the circular seal ring 33, as shown in fig. 8, the second seal ring 32 is recessed in the middle of the surface of the second seal ring 32 contacting the circular seal ring 33 for positioning the circular seal ring 33. Through the arrangement, the two are deformed only in the radial direction, the inner wall of the circular sealing ring 33 is tightly attached to the groove on the outer wall of the second sealing ring 32, and dislocation between the two is prevented.

Also in order to equalize the pressure inside and outside the second seal ring 32, in the embodiment of the present invention, as shown in fig. 7, the inner wall of the cage 30 further has a second passage 34, and the second passage 34 is disposed to communicate with the bottom of the second seal groove 31.

EXAMPLE III

In the third embodiment of the present invention, on the basis of the first embodiment, the position of the second seal structure in the second embodiment is adjusted, and the second seal structure is provided on the valve core 40 to move following the movement of the valve core 40;

as shown in fig. 10 and 11, the second seal structure is provided on the valve core 40, the valve core 40 includes a core 41 and an end cap 42 fixed to a free end of the core 41, a joint between the end cap 42 and the core 41 forms a fixing cavity 43 between the second seal ring 32 and the circular seal ring 33, and the fixing cavity 43 is opened toward an outer wall of the core 41. Thus, when the second sealing structure is specifically fixed, the end cover 42 is separated from the core body 41, then the circular sealing ring 33 and the second sealing ring 32 are sleeved in the fixing cavity 43 of the core body 41, so that the convex part of the second sealing ring 32 faces the outer side of the core body 41, and then the end cover 42 is fixed, wherein the fixing is preferably threaded fixing, so that the subsequent replacement of the second sealing ring 32 and the circular sealing ring 33 is convenient; through the structural arrangement, the valve core 40 can keep sealing with the outer wall when moving.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.