Stop valve seal structure and stop valve

Abstract

The application discloses a stop valve sealing structure and a stop valve. The stop valve sealing structure comprises a valve seat, a valve clack and an elastic sealing ring. The valve clack is slidingly matched in the inner cavity of the valve seat. The inner cavity of the valve seat is provided with a first taper surface. The valve clack is provided with a second taper surface opposite to the first taper surface. At least one of the first taper surface and the second taper surface is an elastic taper surface. The elastic sealing ring surrounds the first taper surface. The elastic sealing ring is connected with one of the valve seat and the valve clack. The elastic sealing ring is pressed on the other one of the valve seat and the valve clack when the first taper surface and the second taper surface abut. The stop valve sealing structure has the advantages of good sealing effect and strong sealing stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stop valves, in particular to a stop valve sealing structure and a stop valve. BACKGROUND

[0002] The nuclear-grade helium isolation valve (stop valve) is a high-temperature gas-cooled reactor with a wide range of pressure-bearing equipment, which needs to operate under high-temperature and high-pressure conditions, and plays an important role in ensuring the normal and stable operation and safety of the high-temperature gas-cooled reactor. The helium isolation valve has high sealing performance requirements for the high-temperature gas-cooled reactor, but since helium has strong permeability, it puts forward high requirements for the sealing performance of the main sealing pair of the helium isolation valve. The helium isolation valve in the related art adopts a spherical sealing pair, and the valve disc and the valve seat are stacked with alloys of different hardness to form a hardness difference, so that the stop valve has good initial sealing performance. However, after a certain number of actions, different degrees of indentation will be produced on the sealing surface of the valve disc and the valve seat, which will greatly reduce the sealing performance of the main seal of the stop valve, and the leakage rate will far exceed the system requirements, thereby affecting the normal use of the stop valve. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, the embodiments of the present application provide a stop valve sealing structure, which has the advantages of good sealing effect and strong sealing stability.

[0005] The embodiments of the present application also provide a stop valve.

[0006] The stop valve sealing structure according to the embodiments of the present application comprises a valve seat, a valve disc and an elastic sealing ring, the valve disc is slidingly fitted in the inner cavity of the valve seat, the inner cavity of the valve seat is provided with a first taper surface, the valve disc is provided with a second taper surface opposite to the first taper surface, and at least one of the first taper surface and the second taper surface is an elastic taper surface; the elastic sealing ring surrounds the first taper surface, and the elastic sealing ring is connected to one of the valve seat and the valve disc, and the elastic sealing ring is pressed against the other one of the valve seat and the valve disc when the first taper surface and the second taper surface abut.

[0007] According to the stop valve sealing structure of the embodiments of the present application, when the stop valve is in a closed state, the first taper surface on the valve disc can be in contact with the second taper surface through the elastic surface of the first taper surface and / or the second taper surface, so as to facilitate the valve disc to block the inner cavity of the valve seat. At the same time, the elastic sealing ring is also clamped between the valve seat and the valve disc, so as to further realize the sealing between the valve disc and the valve seat, and further ensure the blocking of the inner cavity of the valve seat by the valve disc. Therefore, the combination of the above two sealing modes makes the sealing effect of the stop valve better, the probability of sealing failure smaller, the sealing stability stronger, and the adaptability wider.

[0008] In some embodiments, the inner cavity of the valve seat has a stepped surface opposite to the valve disc, and the elastic sealing ring is connected to the valve disc and protrudes from an end surface of the valve disc opposite to the stepped surface.

[0009] In some embodiments, the valve disc comprises an elastic cone sleeve protruding from an end surface of the valve disc opposite to the stepped surface, and an outer peripheral surface of the elastic cone sleeve forms the deformable first tapered surface.

[0010] In some embodiments, the elastic sealing ring comprises a polyimide sealing ring.

[0011] In some embodiments, the stop valve sealing structure further comprises a locking sleeve sleeved on the valve disc, an annular cavity is formed between the locking sleeve and the valve disc and faces the stepped surface, and the elastic sealing ring is fitted in the annular cavity.

[0012] In some embodiments, the elastic sealing ring is slidably fitted in the annular cavity.

[0013] In some embodiments, a cross-sectional shape of the annular cavity matches a cross-sectional shape of the elastic sealing ring, the cross-sectional shape of the annular cavity is frustoconical, and a necked portion of the annular cavity faces the stepped surface.

[0014] In some embodiments, the stop valve sealing structure further comprises a bolt and a gasket, the locking sleeve is provided with a connecting hole, the valve disc is provided with a threaded hole, and the bolt passes through the gasket and the connecting hole and is threadedly fitted with the threaded hole.

[0015] In some embodiments, the gasket comprises a double-ear stop gasket.

[0016] The stop valve according to an embodiment of the present application comprises the stop valve sealing structure according to any one of the above embodiments.

[0017] The technical advantages of the stop valve according to an embodiment of the present application are the same as those of the stop valve sealing structure according to the above embodiments, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view of a stop valve sealing structure according to an embodiment of the present application.

[0019] Figure 2 is Figure 1 is an enlarged view A in

[0020] REFERENCE SIGNS:

[0021] 1, valve disc; 11, elastic cone sleeve; 111, first tapered surface; 2, valve seat; 21, stepped surface; 22, second tapered surface; 3, valve stem; 4, locking sleeve; 5, bolt; 6, double-ear stop washer; 7, elastic sealing ring. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0023] The present application is described below in conjunction with Figure 1 and Figure 2 The sealing structure of the stop valve according to the embodiments of the present application is described.

[0024] As shown in Figure 1 and Figure 2 , the sealing structure of the stop valve according to the embodiments of the present application includes a valve seat 2, a valve disc 1, and an elastic sealing ring 7. The valve disc 1 is slidingly fitted in the inner cavity of the valve seat 2, the inner cavity of the valve seat 2 is provided with a first tapered surface 111, the valve disc 1 is provided with a second tapered surface 22 opposite to the first tapered surface 111, and at least one of the first tapered surface 111 and the second tapered surface 22 is an elastic tapered surface. The elastic sealing ring 7 surrounds the first tapered surface 111, the elastic sealing ring 7 is connected to one of the valve seat 2 and the valve disc 1, and the elastic sealing ring 7 is pressed against the other one of the valve seat 2 and the valve disc 1 when the first tapered surface 111 and the second tapered surface 22 abut.

[0025] The sealing structure of the stop valve according to the embodiments of the present application, when the stop valve is in a closed state, the first tapered surface 111 on the valve disc 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 as to facilitate the valve disc 1 to block the inner cavity of the valve seat 2. At the same time, the elastic sealing ring 7 is also clamped between the valve seat 2 and the valve disc 1, so as to further realize the sealing between the valve disc 1 and the valve seat 2, and further ensure the blocking of the valve disc 1 to the inner cavity of the valve seat 2. Thus, the combination of the above two sealing modes makes the sealing effect of the stop valve better, the probability of sealing failure smaller, and the sealing stability stronger and the adaptability wider.

[0026] In some embodiments, as shown in Figure 2 , the inner cavity of the valve seat 2 has a stepped surface 21 opposite to the valve disc 1, the elastic sealing ring 7 is connected to the valve disc 1, and at least part of the elastic sealing ring 7 protrudes from the end surface of the valve disc 1 opposite to the stepped surface 21.

[0027] Thus, the installation of the elastic sealing ring 7 on the valve disc 1 is more simple and convenient than the installation in the inner cavity of the valve seat 2, the elastic sealing ring 7 is close to and contacts the stepped surface 21 of the valve seat 2 with the valve disc 1, and the elastic sealing ring 7 that is elastically deformed realizes the sealing between the valve disc 1 and the valve seat 2.

[0028] like Figure 2 As shown, a raised structure for opposing the elastic sealing ring 7 can also be provided on the stepped surface 21.

[0029] In some embodiments, the valve disc 1 includes an elastic cone sleeve 11, which protrudes from the end face of the valve disc 1 opposite to the stepped surface 21, and the outer peripheral surface of the elastic cone sleeve 11 forms a deformable first cone surface 111.

[0030] Specifically, such as Figure 2 As shown, both the outer and inner circumferential surfaces of the elastic cone sleeve 11 are conical surfaces. By providing a countersunk hole for the elastic cone sleeve 11 and making its outer circumferential surface the first conical surface 111, after the elastic cone sleeve 11 abuts against the second conical surface 22 on the valve seat 2, under the action of the axial force of the valve disc 1, the elastic cone sleeve 11 is more likely to undergo elastic deformation inward, thereby ensuring a tight fit between the first conical surface 111 and the second conical surface 22, and further ensuring the sealing performance of the valve disc 1 and the valve seat 2 at this point.

[0031] Alternatively, an elastic layer can be wrapped around the outer periphery of the elastic cone sleeve 11, with the first cone surface 111 formed on the outer surface of the elastic layer. The elastic deformation of the elastic layer effectively ensures the close contact between the first cone surface 111 and the second cone surface 22, thereby further ensuring the sealing between the valve disc 1 and the valve seat 2.

[0032] In some embodiments, the resilient sealing ring 7 comprises a polyimide sealing ring.

[0033] Therefore, the elastic sealing ring 7 has a high heat distortion temperature, as well as high hardness and good radiation resistance, which can meet the requirements of the gate valve under high temperature and radiation conditions. That is, the gate valve sealing structure of this embodiment can be used in nuclear-grade helium isolation valves to achieve pipeline sealing under high temperature and high pressure conditions and prevent helium leakage.

[0034] In some embodiments, such as Figure 2 As shown, the sealing structure of the gate valve also includes a locking sleeve 4, which is sleeved on the valve disc 1. The locking sleeve 4 and the valve disc 1 form an annular cavity with the opening facing the stepped surface 21, and the elastic sealing ring 7 is fitted in the annular cavity.

[0035] Therefore, the installation of the elastic sealing ring 7 on the valve disc 1 is convenient and reliable.

[0036] Specifically, the elastic sealing ring 7 is first fitted onto the valve disc 1, and then the locking sleeve 4 is fitted onto the valve disc 1, thereby limiting the elastic sealing ring 7 in its radial direction and ensuring that the elastic sealing ring 7 can be stably deformed under the pressure of the stepped surface 21, so as to achieve a seal between the valve disc 1 and the valve seat 2.

[0037] In some embodiments, the elastic sealing ring 7 is slidably fitted in the annular cavity.

[0038] 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 surface of the elastic sealing ring 7 is spaced apart from the valve disc 1, and the lower end surface of the elastic sealing ring 7 is spaced apart from the stepped surface 21; when the valve disc 1 is switched to the closed position under the push of the valve stem 3, the elastic sealing ring 7 first abuts against the stepped surface 21, then slides and abuts against the valve disc 1 under the stop of the stepped surface 21, 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 disc 1 and the valve seat 2.

[0039] The above arrangement can make the elastic sealing ring 7 elastically deform more greatly on the basis of a certain axial force of the valve stem 3 on the valve disc 1 and the hardness of the elastic sealing ring 7 being too high, thereby better realizing the sealing between the valve disc 1 and the valve seat 2.

[0040] Alternatively, part of the elastic sealing ring 7 can also be clamped and fixed in the annular cavity, at this time, at least the part of the elastic sealing ring 7 protruding out of the annular cavity can elastically deform, which can also ensure the sealing between the valve disc 1 and the valve seat 2.

[0041] In some embodiments, as shown in Figure 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 a truncated cone shape, and the necking of the annular cavity faces the stepped surface 21.

[0042] The thickness of the opening of the annular cavity is less than the maximum thickness of the elastic sealing ring 7, so that after the elastic sealing ring 7 is fitted in the annular cavity, the elastic sealing ring 7 can effectively avoid being mistakenly pulled out of the annular cavity to cause the soft sealing between the valve disc 1 and the valve seat 2 to fail, thereby further ensuring the sealing stability of the stop valve.

[0043] In some embodiments, as shown in Figure 2 the stop valve sealing structure further includes a bolt 5 and a washer, the locking sleeve 4 is provided with a connecting hole, the valve disc 1 is provided with a threaded hole, and the bolt 5 passes through the washer and the connecting hole and is threadedly connected with the threaded hole.

[0044] In this way, the connection between the valve disc 1 and the locking sleeve 4 is simple and has high connection strength. Moreover, the arrangement of the washer effectively avoids the loosening of the bolt 5, thereby further ensuring the connection stability between the locking sleeve 4 and the valve disc 1.

[0045] Specifically, the bolt 5, the connecting hole and the threaded hole are all multiple and one-to-one corresponding, the multiple connecting holes are equally spaced along the circumference of the locking sleeve 4, and the multiple bolts 5 pass through the corresponding connecting holes and are threadedly connected with the corresponding threaded holes, so that the connection stability between the locking sleeve 4 and the valve disc 1 is higher.

[0046] In some embodiments, the gasket comprises a double-ear stop gasket 6.

[0047] One ear of the double-ear stop gasket 6 is bent and in contact with the side of the head of the bolt 5, and the other ear is bent and in contact with the side of the valve disc 1, thereby further avoiding the misrotation of the bolt 5, and further ensuring the stability of the connection between the locking sleeve 4 and the valve disc 1.

[0048] The stop valve according to the embodiments of the present application comprises the stop valve sealing structure according to any of the above embodiments.

[0049] The technical advantages of the stop valve according to the embodiments of the present application are the same as those of the stop valve sealing structure according to the above embodiments, which will not be described herein again.

[0050] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0051] In addition, the terms “first” and “second” are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with “first” and “second” can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of “plurality” is at least two, such as two, three, etc., unless otherwise specifically limited.

[0052] In the present application, unless otherwise specifically defined and limited, the terms “mounting”, “connection”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or in communication with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0054] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein merely as identifiers for different elements, regions, or layers, and are not intended to be taken literally, unless otherwise specified.

[0055] Although the above-mentioned embodiments have been shown and described, it is to be understood that these embodiments are exemplary only, and are not to be taken as limiting the scope of the present application, and that changes, modifications, substitutions and variations can be made to the above-mentioned embodiments by those skilled in the art without departing from the scope of the present application.

Claims

1. A sealing structure for a gate valve, characterized in that, include: A valve seat and a valve disc, the valve disc being slidably fitted within the inner cavity of the valve seat, the inner cavity of the valve seat having a first conical surface, and the valve disc having a second conical surface opposite to the first conical surface, at least one of the first conical surface and the second conical surface being an elastic conical surface; and An elastic sealing ring surrounds the first conical surface and is connected to one of the valve seat and the valve disc. The elastic sealing ring is used to press against the other of the valve seat and the valve disc when the first conical surface abuts against the second conical surface. The inner cavity of the valve seat has a stepped surface opposite to the valve disc. The elastic sealing ring is connected to the valve disc, and at least a portion of the elastic sealing ring protrudes from the end face of the valve disc opposite to the stepped surface. The shut-off valve sealing structure also includes a locking sleeve, which is sleeved on the valve disc. The locking sleeve and the valve disc form an annular cavity with the opening facing the stepped surface, and the elastic sealing ring is fitted inside the annular cavity. The elastic sealing ring can be slidably fitted within the annular cavity; 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 frustoconical, and the constriction of the annular cavity faces the stepped surface.

2. The shut-off valve sealing structure according to claim 1, characterized in that, The valve disc includes an elastic cone sleeve that protrudes from the end face of the valve disc opposite to the stepped surface, and the outer peripheral surface of the elastic cone sleeve forms a deformable first cone surface.

3. The shut-off valve sealing structure according to claim 1, characterized in that, The elastic sealing ring includes a polyimide sealing ring.

4. The shut-off valve sealing structure according to claim 3, characterized in that, The sealing structure of the shut-off valve also includes bolts and washers. The locking sleeve is provided with a connecting hole, and the valve disc is provided with a threaded hole. The bolt passes through the washer and the connecting hole and is threadedly engaged with the threaded hole.

5. The shut-off valve sealing structure according to claim 4, characterized in that, The washers include double-eared locking washers.

6. A shut-off valve, characterized in that, Includes the shut-off valve sealing structure as described in any one of claims 1-5.

Images