CN115574107A - Stop valve seal structure and stop valve - Google Patents

Abstract

The invention discloses a stop valve sealing structure and a stop valve, wherein the stop valve sealing structure comprises a valve seat, a valve clack and an elastic sealing ring, the valve clack is in sliding fit in an inner cavity of the valve seat, a first conical surface is arranged in the inner cavity of the valve seat, a second conical surface opposite to the first conical surface is arranged on the valve clack, at least one of the first conical surface and the second conical surface is an elastic conical surface, the elastic sealing ring surrounds the first conical surface, the elastic sealing ring is connected with one of the valve seat and the valve clack, and the elastic sealing ring is used for pressing against the other of the valve seat and the valve clack when the first conical surface is abutted against the second conical surface. The stop valve sealing structure provided by the invention has the advantages of good sealing effect and strong sealing stability.

Description

Stop valve seal structure and stop valve

Technical Field

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

Background

The nuclear grade helium isolating valve (stop valve) is a pressure-bearing device with wide area and large volume in the high-temperature gas cooled reactor, needs to operate under the working condition of high temperature and high pressure, and plays an important role in ensuring the normal stable operation and safety of the high-temperature gas cooled reactor. The high-temperature reactor gas cooled reactor has higher requirement on the sealing performance of the helium isolation valve, but the helium has strong permeability, so that the high requirement on the sealing performance of the main sealing pair of the helium isolation valve is provided. In the related technology, the helium isolating valve adopts a spherical sealing pair, and the valve clack and the valve seat are overlaid with different-hardness alloy to form hardness difference, so that the stop valve has good initial sealing performance. However, after the structure acts for a certain number of times, indentations with different degrees are generated on the sealing surfaces of the valve clack and the valve seat, so that the sealing performance of the main seal of the stop valve is greatly reduced, the leakage rate far exceeds the system requirement, and the normal use of the stop valve is influenced.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the embodiment of the invention provides a stop valve sealing structure which has the advantages of good sealing effect and strong sealing stability.

The embodiment of the invention also provides the stop valve.

The stop valve sealing structure comprises a valve seat, a valve clack and an elastic sealing ring, wherein the valve clack is in sliding fit in an inner cavity of the valve seat, a first conical surface is arranged in the inner cavity of the valve seat, a second conical surface opposite to the first conical surface is arranged on the valve clack, and at least one of the first conical surface and the second conical surface is an elastic conical surface; the elastic sealing ring surrounds the first conical surface, is connected with one of the valve seat and the valve clack, and is used for pressing against the other one of the valve seat and the valve clack when the first conical surface is abutted against the second conical surface.

According to the stop valve sealing structure provided by the embodiment of the invention, when the stop valve is in a closed state, the first conical surface on the valve clack can be in contact with the second conical surface in a fitting manner through the elastic surface of the first conical surface and/or the second conical surface, so that the valve clack can realize the sealing of the inner cavity of the valve seat. Meanwhile, the elastic sealing ring is also clamped between the valve seat and the valve clack so as to further realize sealing between the valve clack and the valve seat and further ensure the valve clack to block an inner cavity of the valve seat. From this, the combination of above-mentioned two kinds of sealed modes for the sealed effect of stop valve is better, and sealed probability of inefficacy is littleer, and then sealing stability is stronger, and the adaptability is wider.

In some embodiments, the inner cavity of the valve seat has a stepped surface opposite the valve flap, and the elastic sealing ring is connected to the valve flap, and at least a portion of the elastic sealing ring protrudes from an end surface of the valve flap opposite the stepped surface.

In some embodiments, the valve flap comprises an elastic taper sleeve, the elastic taper sleeve protrudes from an end face of the valve flap opposite to the stepped face, and an outer peripheral surface of the elastic taper sleeve forms the deformable first tapered face.

In some embodiments, the resilient seal ring comprises a polyimide seal ring.

In some embodiments, the stop valve sealing structure further comprises a locking sleeve, the locking sleeve is sleeved on the valve clack, an annular cavity with an opening facing the stepped surface is formed between the locking sleeve and the valve clack, and the elastic sealing ring is matched in the annular cavity.

In some embodiments, the elastomeric seal ring is slidably fitted within the annular cavity.

In some embodiments, the cross-sectional shape of the annular cavity matches the cross-sectional shape of the elastic sealing ring, the cross-sectional shape of the annular cavity is a frustum shape, and the throat of the annular cavity faces the stepped surface.

In some embodiments, the stop valve sealing structure further comprises a bolt and a gasket, a connecting hole is formed in the locking sleeve, a threaded hole is formed in the valve flap, and the bolt penetrates through the gasket and the connecting hole and is in threaded fit with the threaded hole.

In some embodiments, the gasket comprises a binaural stop gasket.

A shut-off valve according to an embodiment of the present invention includes a shut-off valve sealing structure as described in any of the above embodiments.

The technical advantages of the stop valve according to the embodiment of the present invention are the same as those of the seal structure of the stop valve in the above embodiment, and are not described herein again.

Drawings

FIG. 1 is a schematic view of a shut-off valve sealing structure according to an embodiment of the invention.

Fig. 2 is an enlarged view a in fig. 1.

Reference numerals:

1. a valve flap; 11. an elastic taper sleeve; 111. a first conical surface; 2. a valve seat; 21. a step surface; 22. a second tapered surface; 3. a valve stem; 4. a locking sleeve; 5. a bolt; 6. a binaural stop washer; 7. an elastic sealing ring.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A shut-off valve sealing structure according to an embodiment of the present invention is described below with reference to fig. 1 and 2.

As shown in fig. 1 and 2, a shut-off valve sealing structure according to an embodiment of the present invention includes a valve seat 2, a valve flap 1, and an elastic seal ring 7. The valve clack 1 is in sliding fit in an inner cavity of the valve seat 2, a first conical surface 111 is arranged in the inner cavity of the valve seat 2, a second conical surface 22 opposite to the first conical surface 111 is arranged on the valve clack 1, and at least one of the first conical surface 111 and the second conical surface 22 is an elastic conical surface. The elastic sealing ring 7 surrounds the first conical surface 111, the elastic sealing ring 7 is connected with one of the valve seat 2 and the valve clack 1, and the elastic sealing ring 7 is used for pressing against the other one of the valve seat 2 and the valve clack 1 when the first conical surface 111 is abutted with the second conical surface 22.

According to the stop valve sealing structure provided by the embodiment of the invention, when the stop valve is in a closed state, the first tapered surface 111 on the valve flap 1 can be in close contact with the second tapered surface 22 through the elastic surface of the first tapered surface 111 and/or the second tapered surface 22, so that the valve flap 1 can close off the inner cavity of the valve seat 2. Meanwhile, the elastic sealing ring 7 is also clamped between the valve seat 2 and the valve clack 1 so as to further realize the sealing between the valve clack 1 and the valve seat 2 and further ensure the plugging of the valve clack 1 to the inner cavity of the valve seat 2. From this, the combination of above-mentioned two kinds of sealed modes for the sealed effect of stop valve is better, and sealed probability of inefficacy is littleer, and then sealing stability is stronger, and adaptability is wider.

In some embodiments, as shown in fig. 2, the inner cavity of the valve seat 2 has a stepped surface 21 opposite to the valve flap 1, the elastic sealing ring 7 is connected to the valve flap 1, and at least a part of the elastic sealing ring 7 protrudes from an end surface of the valve flap 1 opposite to the stepped surface 21.

From this, the installation of elastic sealing ring 7 on valve clack 1 compares in the installation in the inner chamber of disk seat 2 more simple and convenient, and elastic sealing ring 7 is close to and contacts the ladder face 21 of disk seat 2 along with valve clack 1, and elastic deformation's elastic sealing ring 7 realizes promptly that valve clack 1 and disk seat 2 are sealed between.

As shown in fig. 2, a convex structure for opposing the elastic packing 7 may be further provided on the stepped surface 21.

In some embodiments, the valve flap 1 includes an elastic taper sleeve 11, the elastic taper sleeve 11 protrudes from an end surface of the valve flap 1 opposite to the stepped surface 21, and an outer peripheral surface of the elastic taper sleeve 11 forms a deformable first taper surface 111.

Specifically, as shown in fig. 2, the outer circumferential surface and the inner circumferential surface of the elastic taper sleeve 11 are both conical surfaces, and by providing that the elastic taper sleeve 11 has a counter bore and the outer circumferential surface thereof is the first conical surface 111, after the elastic taper sleeve 11 abuts against the second conical surface 22 on the valve seat 2, under the action of the axial force of the valve flap 1, the elastic taper sleeve 11 is more likely to generate inward elastic deformation, thereby ensuring close contact between the first conical surface 111 and the second conical surface 22, and further ensuring the sealing performance of the valve flap 1 and the valve seat 2 at this point.

Or, an elastic layer may be coated on the outer peripheral surface of the elastic taper sleeve 11, the first conical surface 111 is formed on the outer surface of the elastic layer, and the elastic deformation of the elastic layer effectively ensures the first conical surface 111 and the second conical surface 22 to be in contact with each other, so as to further ensure the sealing property between the valve flap 1 and the valve seat 2.

In some embodiments, the elastic sealing ring 7 comprises a polyimide sealing ring.

Therefore, the elastic sealing ring 7 is high in thermal deformation temperature, high in hardness and good in irradiation resistance, and can meet the use requirements of the stop valve under high-temperature and irradiation working conditions. The stop valve seal structure of this embodiment can be used for nuclear grade helium isolating valve promptly to realize the sealed to the pipeline under high temperature high pressure operating mode, avoid revealing of helium.

In some embodiments, as shown in fig. 2, the stop valve sealing structure further includes a locking sleeve 4, the locking sleeve 4 is sleeved on the valve flap 1, an annular cavity with an opening facing the stepped surface 21 is formed between the locking sleeve 4 and the valve flap 1, and the elastic sealing ring 7 is fitted in the annular cavity.

Therefore, the elastic sealing ring 7 is convenient and reliable to mount on the valve clack 1.

Specifically, firstly, the elastic sealing ring 7 is sleeved on the valve clack 1, and then the locking sleeve 4 is sleeved on the valve clack 1, so that the elastic sealing ring 7 is limited in the radial direction, and the elastic sealing ring 7 can be stably deformed under the compression of the stepped surface 21, so that the sealing between the valve clack 1 and the valve seat 2 is realized.

In some embodiments, the elastic sealing ring 7 is slidably fitted in the annular cavity.

Specifically, the sliding direction of the elastic sealing ring 7 is the up-down direction, when the stop valve is not closed, the upper end face of the elastic sealing ring 7 is spaced from the valve flap 1, and the lower end face of the elastic sealing ring 7 is spaced from the stepped surface 21; when the valve clack 1 is pushed by the valve rod 3 to enable the stop valve to be switched to the closing position, the elastic sealing ring 7 is firstly abutted against the step surface 21, then under the stopping of the step surface 21, the elastic sealing ring 7 slides relative to the annular cavity and stops against the valve clack 1, and then the part of the elastic sealing ring 7 in the annular cavity and the part protruding out of the annular cavity are elastically deformed to realize the sealing between the valve clack 1 and the valve seat 2.

Above-mentioned setting, on the basis that 7 hardness of elastic sealing ring is too high, can be on the certain basis of axial force that valve rod 3 caused to valve clack 1 for elastic sealing ring 7 takes place bigger elastic deformation, and then realizes sealing between valve clack 1 and disk seat 2 better.

Alternatively, the elastic sealing ring 7 may be clamped and fixed in the annular cavity, and at this time, at least the portion of the elastic sealing ring 7 protruding out of the annular cavity can be elastically deformed, so as to ensure the sealing between the valve flap 1 and the valve seat 2.

In some embodiments, as shown in fig. 2, the cross-sectional shape of the annular cavity matches the cross-sectional shape of the elastic sealing ring 7, the cross-sectional shape of the annular cavity is frustum-shaped, and the throat of the annular cavity faces the stepped surface 21.

The thickness of the opening part of the annular cavity is smaller than the maximum thickness of the elastic sealing ring 7, so that the elastic sealing ring 7 is matched in the annular cavity, the phenomenon that the elastic sealing ring 7 is mistakenly separated from the annular cavity to cause the failure of soft sealing between the valve clack 1 and the valve seat 2 is effectively avoided, and the sealing stability of the stop valve is further ensured.

In some embodiments, as shown in fig. 2, the stop valve sealing structure further comprises a bolt 5 and a gasket, the locking sleeve 4 is provided with a connecting hole, the valve clack 1 is provided with a threaded hole, and the bolt 5 penetrates through the gasket and the connecting hole and is in threaded fit with the threaded hole.

Therefore, the connection between the valve clack 1 and the locking sleeve 4 is simple and has high connection strength. Moreover, the setting of packing ring is effectively avoided bolt 5 not hard up, further guarantees the stability of being connected between lock sleeve 4 and the valve clack 1.

Specifically, bolt 5, connecting hole and screw hole all have a plurality ofly and a one-to-one, and a plurality of connecting holes are arranged along the circumference of lock sleeve 4 equidistant, and a plurality of bolts 5 pass corresponding connecting hole and with corresponding screw hole screw-thread fit for the stability of being connected between lock sleeve 4 and valve clack 1 is higher.

In some embodiments, the gasket comprises a binaural stop gasket 6.

One lug of the double-lug stop washer 6 is bent and is in contact with the side surface of the head of the bolt 5 in a fitting manner, and the other lug of the double-lug stop washer 6 is bent and is in contact with the side surface of the valve clack 1 in a fitting manner, so that the bolt 5 is further prevented from being rotated by mistake, and the connection stability between the locking sleeve 4 and the valve clack 1 is further ensured.

A shut-off valve according to an embodiment of the present invention includes a shut-off valve sealing structure as in any of the embodiments described above.

The technical advantages of the stop valve according to the embodiment of the present invention are the same as those of the seal structure of the stop valve in the above-described embodiment, and are not described herein again.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Although the above embodiments have been shown and described, it should be understood that they are exemplary and not intended to limit the invention, and that various changes, modifications, substitutions and alterations can be made herein by those skilled in the art without departing from the scope of the invention.

Claims (10)

1. A shut-off valve sealing structure, comprising:

the valve seat is in sliding fit with the valve clack in an inner cavity of the valve seat, a first conical surface is arranged in the inner cavity of the valve seat, a second conical surface opposite to the first conical surface is arranged on the valve clack, and at least one of the first conical surface and the second conical surface is an elastic conical surface; and

and the elastic sealing ring surrounds the first conical surface, is connected with one of the valve seat and the valve clack, and is used for pressing against the other one of the valve seat and the valve clack when the first conical surface is abutted against the second conical surface.

2. The shut-off valve sealing structure of claim 1, wherein the interior cavity of the valve seat has a stepped surface opposite the valve flap, the resilient sealing ring being connected to the valve flap, at least a portion of the resilient sealing ring projecting from an end surface of the valve flap opposite the stepped surface.

3. The shut-off valve sealing structure according to claim 2, wherein the valve flap includes an elastic taper sleeve projecting from an end surface of the valve flap opposite to the stepped surface, an outer peripheral surface of the elastic taper sleeve constituting the deformable first tapered surface.

4. The shut-off valve sealing structure of claim 2, wherein said resilient sealing ring comprises a polyimide sealing ring.

5. The sealing structure of the cut-off valve according to claim 2, characterized in that, the sealing structure of the cut-off valve further comprises a locking sleeve, the locking sleeve is sleeved on the valve flap, the locking sleeve and the valve flap form an annular cavity with an opening facing the step surface, and the elastic sealing ring is matched in the annular cavity.

6. The shut-off valve sealing structure of claim 5, wherein the resilient sealing ring is slidably fitted within the annular cavity.

7. The shut-off valve sealing structure according to claim 6, characterized in that the cross-sectional shape of the annular cavity matches the cross-sectional shape of the elastic sealing ring, the cross-sectional shape of the annular cavity is a frustum shape, and the throat of the annular cavity faces the stepped surface.

8. The stop valve sealing structure according to claim 5, characterized in that the stop valve sealing structure further comprises a bolt and a washer, a connecting hole is provided on the locking sleeve, a threaded hole is provided on the valve flap, and the bolt passes through the washer and the connecting hole and is in threaded fit with the threaded hole.

9. The shut-off valve sealing structure of claim 8, wherein said gasket comprises a double-lug stop gasket.

10. A shut-off valve comprising a shut-off valve sealing structure according to any one of claims 1 to 9.

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