Sealing assembly for a valve and valve

Abstract

This disclosure relates to a valve sealing assembly and a valve. The valve includes a valve shaft and a valve cover fitted onto the valve shaft, with an annular receiving gap formed between the valve shaft and the valve cover. The sealing assembly includes a packing section and a clamping section. The packing section includes: multiple annular packing rings fitted onto the valve shaft, the annular packing rings having a V-shaped cross-section, the multiple annular packing rings being stacked sequentially along the axial direction with their open ends facing away from the clamping section; a first packing pad and a second packing pad, each having an annular structure fitted onto the valve shaft, and respectively disposed at both ends of the multiple annular packing rings along the axial direction. By setting the cross-section of the annular packing rings to V-shape and stacking them sequentially along the axial direction, and by using the clamping section to axially clamp from the side facing away from the open end of the annular packing rings, the special V-shaped structure of the annular packing rings allows the side facing away from the open end to have good radial deformation capacity when subjected to axial clamping, thereby enabling it to abut against the valve cover and valve shaft on both radial sides to achieve a good sealing effect.

Description

Technical Field

[0001] This disclosure relates to the field of valve technology, and more specifically, to a valve sealing assembly and a valve. Background Technology

[0002] Valves typically consist of a valve shaft and a valve cover fitted onto the valve shaft. A clearance exists between the valve shaft and the valve cover. To ensure the valve's sealing performance, a packing system is needed to seal this clearance. In related technologies, a common sealing system consists of multiple layers of graphite stacked together, with a rectangular cross-section. This graphite is compressed under axial pressure to create a seal. However, this type of sealing system requires significant axial pressure to achieve the desired sealing effect, making it prone to poor sealing and leakage when the axial pressure is insufficient. This leakage is particularly severe when the valve is a control valve used in high-temperature and high-pressure applications. Summary of the Invention

[0003] The purpose of this disclosure is to provide a valve sealing assembly and a valve to at least partially solve the problems existing in the related art.

[0004] To achieve the above objectives, this disclosure provides a sealing assembly for a valve, the valve including a valve shaft and a valve cover sleeved on the valve shaft, with an annular receiving gap formed between the valve shaft and the valve cover. The sealing assembly includes a packing portion disposed within the receiving gap and a clamping portion for pressing the packing portion along the axial direction of the valve shaft. The packing portion includes: a plurality of annular packings sleeved on the valve shaft, the annular packings having a V-shaped cross-section, the plurality of annular packings being stacked sequentially along the axial direction with the open ends of the annular packings facing away from the clamping portion; and a first packing pad and a second packing pad, each being annularly configured to be sleeved on the valve shaft, the first packing pad and the second packing pad being respectively disposed at both ends of the plurality of annular packings along the axial direction.

[0005] Optionally, at least one set of two adjacent annular packings is provided with an annular septum for shape matching between them. The annular septum has a V-shaped cross-section and is fitted onto the valve shaft. The annular septum is made of metal.

[0006] Optionally, the open end of the annular septum is in contact with the corresponding annular packing, and the end of the annular septum opposite to the open end has a first deformation gap between it and the corresponding annular packing, allowing the annular packing to deform.

[0007] Optionally, the number of the annular septa is two. Five annular packings are disposed between the two annular septa, and three annular packings are disposed between the first packing pad and the second packing pad and their respective adjacent annular septa.

[0008] Optionally, the first packing pad, the second packing pad, and the annular septum are each made of tin bronze.

[0009] Optionally, a second deformation gap is provided near the middle between two adjacent annular packings, allowing the annular packings to deform.

[0010] Optionally, the open end of the annular packing has two intersecting first surfaces, and the end of the annular packing away from the open end has two intersecting second surfaces. The opposing first and second surfaces of two adjacent annular packings have a first included angle α1, which satisfies: 2°≤α1≤3°, and the vertex of the first included angle α1 is located near the sides between the two annular packings.

[0011] Optionally, the annular packing has a third surface facing the valve shaft, and the third surface has a second included angle α2 between it and the side surface of the valve shaft, the second included angle α2 satisfying: 2.5°≤α2≤3.5°.

[0012] Optionally, the annular packing is formed by stacking and pressing multiple layers of annular graphite plates.

[0013] Optionally, the valve cover is formed with a step protruding toward the valve shaft, and the clamping part is used to clamp the packing part to the step.

[0014] Optionally, the clamping part includes: a packing gland, configured as annular to be fitted onto the valve shaft, the packing gland extending at least partially into the receiving gap to abut against the first packing pad; a packing plate, configured as annular to be fitted onto the valve shaft, the packing plate abutting against the end of the packing gland opposite to the first packing pad; a plurality of disc springs, circumferentially spaced at the end of the packing plate opposite to the packing gland; a plurality of studs, respectively passing through the corresponding disc springs and the packing plate and screwed onto the valve cover; and a plurality of nuts, respectively screwed onto the end of the corresponding studs away from the valve cover, so that when the disc springs are compressed, the disc springs generate a spring force pushing against the packing plate.

[0015] Optionally, the clamping part further includes a plurality of guide sleeves. The guide sleeves are constructed as sleeve structures with one open end. The open end of the guide sleeve faces the packing pressure plate and is spaced apart from the packing pressure plate. The end of the guide sleeve away from the open end is provided with a through hole for the corresponding stud to pass through. The plurality of guide sleeves are respectively sleeved on the corresponding disc spring.

[0016] According to a second aspect of this disclosure, a valve is provided, including a valve shaft, a valve cover, and a sealing assembly of the valve as described above.

[0017] The above technical solution involves setting the cross-section of the annular packing to V-shape and stacking them sequentially along the axial direction. The clamping part is axially clamped from the side away from the open end of the annular packing. Due to the special V-shaped structure of the annular packing, the side away from the open end has good radial deformation capacity when subjected to axial clamping, which allows it to abut against the valve cover and valve shaft on both radial sides to achieve a better sealing effect. In other words, compared with traditional sealing packing, this V-shaped structure can have greater radial deformation with a smaller axial clamping force, thereby achieving a better sealing effect and ensuring a more reliable sealing effect.

[0018] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a cross-sectional view of a valve sealing system in use, as exemplarily shown in this disclosure; Figure 2 yes Figure 1 A close-up view of the sealing system near the filling section is shown in the image. Figure 3 yes Figure 2 A magnified view of part A in the middle; Figure 4 yes Figure 2 A magnified view of part B in the middle section.

[0020] Explanation of reference numerals in the attached figures 1-Valve shaft; 2-Valve cover; 21-Step; 3-Packing section; 31-Annular packing; 311-First surface; 312-Second surface; 313-Third surface; 32-First packing pad; 33-Second packing pad; 34-Annular septum; 35-First deformation gap; 36-Second deformation gap; 4-Clamping part; 41-Packing gland; 42-Packing pressure plate; 43-Disc spring; 44-Stud; 45-Nut; 46-Guide sleeve. Detailed Implementation

[0021] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0022] In this disclosure, unless otherwise stated, the directional terms "inner" and "outer" should be understood based on the application environment of the relevant component. They may be defined based on the actual direction in which the relevant component is used, or they may be based on the contour of the component itself. For example, a sealing assembly may include a packing portion disposed "inner" of a receiving gap, meaning that the packing portion is disposed within the receiving space of the receiving gap.

[0023] In addition, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0024] Reference Figures 1-2 This disclosure exemplarily illustrates a sealing assembly for a valve. The valve includes a valve shaft 1 and a valve cover 2 sleeved on the valve shaft 1, with an annular receiving gap formed between the valve shaft 1 and the valve cover 2. The sealing assembly includes a packing portion 3 disposed within the receiving gap and a clamping portion 4 for pressing the packing portion 3 along the axial direction of the valve shaft 1. The packing portion 3 includes a plurality of annular packings 31, a first packing pad 32, and a second packing pad 33. The plurality of annular packings 31 are sleeved on the valve shaft 1, and the cross-sectional structure of the annular packings 31 is V-shaped. The plurality of annular packings 31 are stacked sequentially along the axial direction, with the open ends of the annular packings 31 facing away from the clamping portion 4. The first packing pad 32 and the second packing pad 33 can be respectively constructed as annular to be sleeved on the valve shaft 1, and the first packing pad 32 and the second packing pad 33 can be respectively disposed at both ends of the plurality of annular packings 31 along the axial direction. Here, the material of the annular packings 31 can be graphite, rubber, etc., as long as its structure is V-shaped to have good radial deformation capacity under axial compression. The specific molding method and materials will be described below.

[0025] This disclosure does not limit the specific structure of the clamping part 4, as long as it can clamp the packing part 3 axially. The specific structure will be described below.

[0026] By using the above technical solution, the cross-section of the annular packing 31 is set to V-shape and stacked sequentially along the axial direction. The clamping part 4 clamps axially from the side away from the open end of the annular packing 31. Due to the special V-shaped structure of the annular packing 31, the side away from the open end has good radial deformation capability when subjected to axial clamping, so that it can abut against the valve cover 2 and valve shaft 1 on both radial sides to achieve a better sealing effect. In other words, compared with traditional sealing packing, this V-shaped structure can have greater radial deformation with a smaller axial clamping force, thereby achieving a better sealing effect and ensuring a more reliable sealing effect.

[0027] Reference Figure 2In embodiments of this disclosure, at least one set of adjacent annular packings 31 are provided with an annular septum 34 for shape matching. The cross-section of the annular septum 34 can be constructed as V-shaped and fitted onto the valve shaft 1. The annular septum 34 can be made of metal. Here, "shape matching" means that the annular septum 34 and the annular packings 31 on both sides are shape matched, specifically that the contours of their facing surfaces are substantially the same to facilitate the transmission of axial pressure. Of course, this disclosure does not require that the two adjacent parts fit together perfectly. With this design, the annular septum 34 can match the shape of the annular packing 31. By setting the annular septum 34 made of metal, due to its material properties, it is not easy to deform when subjected to axial compression. It can completely transfer the axial pressure to the downstream annular packing 31, so that the downstream annular packing 31 can be subjected to greater axial compression and undergo radial deformation. This reduces the pressure loss between the multiple layers of annular packing 31, allowing it to press tightly against the valve cover 2 and valve shaft 1 on both sides, improving the isolation capacity of the annular packing 31, reducing media penetration, and improving the sealing effect.

[0028] Reference Figure 2 In the embodiments of this disclosure, the open end of the annular septum 34 can be fitted with the corresponding annular packing 31, so that the annular septum 34 can transfer all the axial compressive force it receives to the annular packing 31 corresponding to its open end. The end of the annular septum 34 opposite to its open end can have a first deformation gap 35 between it and the corresponding annular packing 31, allowing the annular packing 31 to deform. This allows the annular packing 31 located at the end of the annular septum 34 opposite to its open end to undergo local axial displacement under axial pressure, resulting in radial deformation and achieving a better sealing effect.

[0029] This disclosure does not limit the size of the first deformation gap 35. It may be the same size as, larger than or smaller than the second deformation gap mentioned below, and may be designed adaptively according to actual conditions.

[0030] Reference Figure 2This disclosure provides an optimal embodiment, which can be obtained through simulation calculations. In this embodiment, the sealing effect of the packing section 3 is optimal. Specifically, in this optimal embodiment, the number of annular septa 34 can be two, wherein five annular packing 31s can be disposed between the two annular septa 34, and three annular packing 31s can be disposed between the first packing pad 32 and the second packing pad 33 and their respective adjacent annular septa 34. In addition, in some other embodiments, four annular packing 31s can be disposed between the two annular septa 34, and four annular packing 31s can be disposed between the first packing pad 32 and the second packing pad 33 and their respective adjacent annular septa 34. Alternatively, in some other embodiments, the number of annular septa 34 can also be three, four, etc., and can be adaptively designed according to actual needs.

[0031] In embodiments of this disclosure, the first packing gasket 32, the second packing gasket 33, and the annular septum 34 can all be made of tin bronze. This design, due to the excellent thermal conductivity and heat dissipation of tin bronze, ensures the high-pressure and high-temperature resistance of the sealing assembly of this disclosure, making it suitable for use in high-temperature and high-pressure steam regulating valves, etc., thus broadening its applicability. Furthermore, in other embodiments, the first packing gasket 32, the second packing gasket 33, and the annular septum 34 can also be made of silver, aluminum, etc.

[0032] Reference Figure 2 and Figure 3 In embodiments of this disclosure, a second deformation gap 36 may be provided near the center between two adjacent annular packings 31, allowing the annular packings 31 to deform. By providing this second deformation gap 36, the annular packings 31, when subjected to axial compression, can undergo axial deformation or displacement at least near the center, enabling radial displacement of the annular packings 31. In other words, the second deformation gap 36 allows the annular packings 31 to have better radial deformation capacity, resulting in lower required axial sealing pressure and more reliable sealing.

[0033] It should be explained that "near the middle position" here refers to the position of the V-shaped structure of the annular packing 31 near the central protrusion, that is, near the peak of the V-shaped structure. Correspondingly, the following text will mention "positions near the sides" as referring to the positions of the V-shaped structure of the annular packing 31 away from the central protrusion, that is, away from the peak of the V-shaped structure.

[0034] This disclosure does not limit the specific structure and dimensions of the annular packing 31, for example in Figure 3In the illustrated embodiment, the open end of the annular packing 31 may have two intersecting first surfaces 311, and the end of the annular packing 31 facing away from the open end may have two intersecting second surfaces 312. A first included angle α1 may exist between the opposing first surfaces 311 and second surfaces 312 of two adjacent annular packings 31. This first included angle α1 may satisfy: 2° ≤ α1 ≤ 3°, and the vertex of the first included angle α1 may be located near either side of the two annular packings 31. In embodiments of this disclosure, the first included angle α1 may be 2.5°, 2°, 3°, etc. Figure 3 As shown, two adjacent annular packings 31 can have two first included angles α1, and the space between the two first included angles α1 can be used together as the aforementioned second deformation gap 36. With this design, when the upstream annular packing 31 is subjected to axial compression, its position near the middle can move downward. Since there is no displacement gap near its two ends, it will undergo radial deformation, thereby tightly fitting with the valve cover 2 and the valve shaft 1 to achieve a better sealing effect.

[0035] Reference Figure 4 In the embodiments of this disclosure, the annular packing 31 may have a third surface 313 facing the valve shaft 1, and a second included angle α2 is formed between the third surface 313 and the side surface of the valve shaft 1. The second included angle α2 may satisfy: 2.5°≤α2≤3.5°. Specifically, in the embodiments of this disclosure, the second included angle α2 may be 2.5°, 3°, 3.5°, etc. With this design, the second included angle α2 reduces the contact area between the third surface 313 and the valve shaft 1, and under the same radial pressure, the friction between the annular packing 31 and the valve shaft 1 is smaller, thereby reducing the wear of the annular packing 31 during use.

[0036] This disclosure does not limit the formation method of the annular packing 31. For example, in the embodiments of this disclosure, the annular packing 31 can be formed by stacking and pressing multiple layers of annular graphite plates. This forming method is different from the traditional sheet-shaped rectangular graphite packing and has better anti-permeability performance.

[0037] Reference Figure 2 In the embodiments of this disclosure, the valve cover 2 may have a step 21 protruding toward the valve shaft 1, and the clamping part 4 is used to press the packing part 3 to the step 21. By setting the step 21, a stop and limit effect can be formed on the end of the packing part 3 away from the clamping part 4, thereby ensuring that the packing part 3 can be fully squeezed to achieve a seal under the action of the clamping part 4, avoiding the packing part 3 from shifting downward as a whole, resulting in small radial deformation and poor sealing effect.

[0038] This disclosure limits the specific structure of the clamping part 4, referring to... Figure 1In the embodiments of this disclosure, the clamping part 4 may include: a packing gland 41, which is annularly configured to be sleeved on the valve shaft 1, and the packing gland 41 may extend at least partially into the receiving gap to abut against the first packing pad 32; a packing pressure plate 42, which is annularly configured to be sleeved on the valve shaft 1, and the packing pressure plate 42 abuts against the end of the packing gland 41 opposite to the first packing pad 32; a plurality of disc springs 43, which are circumferentially spaced at the end of the packing pressure plate 42 opposite to the packing gland 41; a plurality of studs 44, which pass through the corresponding disc springs 43 and the packing pressure plate 42 in sequence and are screwed to the valve cover 2; and a plurality of nuts 45, which are screwed onto the end of the corresponding studs 44 away from the valve cover 2, so that when the disc springs 43 are compressed, the disc springs 43 generate an elastic force that pushes against the packing pressure plate 42. With this design, when a clamping force needs to be applied to the packing section 3, the nut 45 is tightened to compress the disc spring 43 downwards. This causes the disc spring 43 to generate an elastic force acting on the packing pressure plate 42, which in turn allows the packing pressure plate 42 to push the packing gland 41 to axially compress the packing section 3 to achieve a seal. In the embodiments of this disclosure, the number of disc springs 43, studs 44, and nuts 45 can be three, four, five, etc., and can be adapted to the actual situation.

[0039] In the embodiments of this disclosure, the surface of the packing pressure plate 42 that interacts with the packing gland 41 can be an inclined surface, and the surface of the packing gland 41 that interacts with the packing pressure plate 42 can be an arc surface. With this design, the packing pressure plate 42 is pressed by multiple studs 44. Since the studs 44 and nuts 45 are manually tightened, the horizontal position of the packing pressure plate 42 cannot be guaranteed. The combination of the inclined surface and the arc surface makes the contact surface of the two parts a circle (line contact), ensuring that the packing gland 41 is subjected to uniform force.

[0040] Reference Figure 1 In the embodiments of this disclosure, the clamping part 4 may further include a plurality of guide sleeves 46. The guide sleeves 46 may be constructed as sleeve structures with one open end. The open end of the guide sleeve 46 may face the packing pressure plate 42 and be spaced apart from the packing pressure plate 42. The end of the guide sleeve 46 away from the open end is provided with a through hole (not shown in the figure) for the corresponding stud 44 to pass through. The plurality of guide sleeves 46 may be respectively sleeved on the corresponding disc spring 43. By setting the guide sleeves 46, the misalignment and coiling of the disc spring 43 can be effectively avoided, so that the disc spring 43 can maintain the preload on the annular packing 31 for a long time, thereby improving the sealing reliability of the packing part 3.

[0041] According to a second aspect of this disclosure, a valve is provided, including a valve shaft 1, a valve cover 2, and the aforementioned valve sealing assembly. Since the valve has all the beneficial effects of the aforementioned sealing assembly, they will not be described in detail here.

[0042] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0044] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A sealing assembly for a valve, the valve comprising a valve shaft and a valve cover sleeved on the valve shaft, wherein an annular receiving gap is formed between the valve shaft and the valve cover, characterized in that, The sealing assembly includes a packing portion disposed within the receiving gap, and a clamping portion for pressing the packing portion axially along the valve shaft, the packing portion comprising: Multiple annular packing rings are fitted onto the valve shaft. The cross-sectional structure of the annular packing rings is V-shaped. The multiple annular packing rings are stacked sequentially along the axial direction, with the open ends of the annular packing rings facing away from the clamping part. The first packing pad and the second packing pad are respectively constructed as annular rings to be fitted onto the valve shaft, and the first packing pad and the second packing pad are respectively disposed at both ends of the plurality of annular packings along the axial direction.

2. The sealing assembly of the valve according to claim 1, characterized in that, At least one set of two adjacent annular packings are provided with an annular septum with a shape-matched mat between them. The annular septum has a V-shaped cross-section and is fitted onto the valve shaft. The annular septum is made of metal.

3. The sealing assembly of the valve according to claim 2, characterized in that, The open end of the annular septum is in contact with the corresponding annular packing, and the end of the annular septum opposite to the open end has a first deformation gap between it and the corresponding annular packing, allowing the annular packing to deform.

4. The sealing assembly of the valve according to claim 2, characterized in that, The number of annular septa is two. Five annular packings are disposed between the two annular septa, and three annular packings are disposed between the first packing pad and the second packing pad and their respective adjacent annular septa.

5. The sealing assembly of the valve according to claim 2, characterized in that, The first packing pad, the second packing pad, and the annular septum are all made of tin bronze.

6. The sealing assembly of the valve according to claim 1, characterized in that, The two adjacent annular packings have a second deformation gap near the middle position, which allows the annular packings to deform.

7. The sealing assembly of the valve according to claim 6, characterized in that, The annular packing has two intersecting first surfaces at its open end, and two intersecting second surfaces at its end opposite to the open end. Wherein, the two adjacent annular packings have a first included angle α1 between their opposing first and second faces, the first included angle α1 satisfying: 2°≤α1≤3°, and the vertex of the first included angle α1 is located near the two sides between the two annular packings.

8. The sealing assembly of the valve according to claim 1, characterized in that, The annular packing has a third surface facing the valve shaft, and the third surface has a second included angle α2 with the side surface of the valve shaft, the second included angle α2 satisfying: 2.5°≤α2≤3.5°.

9. The sealing assembly of the valve according to claim 1, characterized in that, The annular packing is formed by stacking and pressing multiple layers of annular graphite plates.

10. The sealing assembly of the valve according to claim 1, characterized in that, The valve cover has a step that protrudes toward the valve shaft, and the clamping part is used to press the packing part against the step.

11. The sealing assembly of the valve according to any one of claims 1-10, characterized in that, The clamping part includes: A packing gland is constructed in an annular shape to be fitted onto the valve shaft, and the packing gland extends at least partially into the receiving gap to abut against the first packing pad; The packing pressure plate is constructed in a ring shape to be sleeved on the valve shaft, and the packing pressure plate abuts against the end of the packing gland opposite to the first packing pad; Multiple disc springs are circumferentially spaced at one end of the packing pressure plate opposite to the packing gland; Multiple studs, respectively, pass through the corresponding disc springs and packing plates and are screwed onto the valve cover; and Multiple nuts are screwed onto the end of the corresponding stud away from the valve cover, so that when the disc spring is compressed, the disc spring generates a spring force that pushes against the packing pressure plate.

12. The sealing assembly of the valve according to claim 11, characterized in that, The clamping part also includes a plurality of guide sleeves. The guide sleeves are constructed as sleeve structures with one open end. The open end of the guide sleeve faces the packing pressure plate and is spaced apart from the packing pressure plate. The end of the guide sleeve away from the open end is provided with a through hole for the corresponding stud to pass through. The plurality of guide sleeves are respectively sleeved on the corresponding disc spring.

13. A valve, characterized in that, The valve assembly includes a valve shaft, a valve cover, and a sealing assembly for the valve as described in any one of claims 1-12.

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