Bidirectional sealing structure of valve element of high-pressure valve

Abstract

The utility model provides a bidirectional sealing structure for a valve core of a high-pressure valve, which is arranged between a valve core component and a sleeve and comprises a plurality of upper sealing rings, a plurality of middle sealing rings and a plurality of lower sealing rings which are sequentially matched from top to bottom. According to the sealing structure, the split combined sealing rings are adopted, the number of the upper sealing ring and the number of the lower sealing ring are designed to meet the sealing requirements of different working conditions, the upper sealing ring, the middle sealing ring and the lower sealing ring deform under pressure, the sealing effect is guaranteed, meanwhile, the flow direction of media is not limited, and the sealing rings can be combined according to the flow direction of the media; and the specific combination mode can be suitable for a valve with a double-flow-direction medium.

Description

Technical Field

[0001] This utility model relates to the field of valve core manufacturing technology, particularly to the field of valve core sealing structure, and especially to a bidirectional sealing structure for a high-pressure valve core. Background Technology

[0002] Currently, in the assembly of existing valves, the sealing between the valve core and the sleeve is achieved in various ways. One common method is packing seal. Packing material is placed between the valve stem and the sleeve, and as the valve stem moves up and down, it creates a lip seal with the valve seat and cover. This method effectively prevents media leakage and ensures the valve's sealing performance. Alternatively, rubber sealing rings, metal sealing rings, or other sealing components can be used to achieve the seal between the valve core and the sleeve. These seals fit tightly against the inner wall of the valve body or sleeve when the valve core rotates or moves, ensuring the valve's sealing performance.

[0003] When sealing is achieved using rubber sealing rings, metal sealing rings, or other sealing components, the existing sealing components are usually annular structures, located between the outer wall of the valve core assembly and the inner wall of the sleeve. A sealing groove is opened on the outer wall of the valve core assembly or the inner wall of the sleeve, and a sealing ring is installed in the sealing groove with an interference fit, thereby achieving a seal between the valve core assembly and the sleeve.

[0004] With the expansion of production capacity in petrochemical and coal chemical industries, the corresponding operating pressure has increased, placing higher demands on the leakage rating of valves. Conventional valves can only meet the requirements of medium and low pressure and unidirectional sealing structures. For ultra-high pressure and demanding operating conditions requiring bidirectional sealing, ordinary valves cannot effectively meet the needs of field use. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a bidirectional sealing structure for a high-pressure valve core, which can effectively adapt to high-pressure and ultra-high-pressure working conditions, and can be adjusted and assembled according to the medium flow direction and pressure level requirements, so as to meet the leakage requirements under different pressure levels.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a bidirectional sealing structure for a high-pressure valve core, disposed between the valve core assembly and the sleeve, including a plurality of upper sealing rings, a plurality of intermediate sealing rings, and a plurality of lower sealing rings arranged sequentially from top to bottom. The upper sealing rings, intermediate sealing rings, and lower sealing rings are all annular structures. The inner wall of the annular structure is statically sealed to the outer wall of the valve core assembly, and the outer wall of the annular structure is dynamically sealed to the inner wall of the sleeve. One side end face of the annular structure of the upper sealing ring has two upper protrusions, forming a concave sealing surface between the two upper protrusions. The other side end face of the annular structure has a protruding... The lower protrusion forms the raised sealing surface of the upper sealing ring; the annular structure of the middle sealing ring has two protrusions on both ends, and the two protrusions on the same end face form the sealing surface of the middle sealing ring; the annular structure of the lower sealing ring is the same as that of the upper sealing ring, and the sealing surfaces are reversed; the raised sealing surface of the upper sealing ring (not the lowest one) mates with the concave sealing surface of the upper sealing ring below it, the raised sealing surface of the lowest upper sealing ring mates with the upper sealing surface of the middle sealing ring, and the lower sealing surface of the middle sealing ring mates with the raised sealing surface of the highest lower sealing ring.

[0007] In the above scheme, compared to the original integrated sealing ring design, the sealing structure uses a combination of upper, middle, and lower sealing rings. The number of upper and lower sealing rings can be designed according to actual needs to adapt to different sealing requirements under different working conditions. For example, when the medium does not have a flow direction, the same number of upper and lower sealing rings are used in conjunction with the middle sealing ring; in cases of long-term low-inlet, high-outlet flow, a configuration with more upper sealing rings and fewer lower sealing rings is used in conjunction with the middle sealing ring; and in cases of long-term high-inlet, low-outlet flow, a configuration with fewer upper sealing rings and more lower sealing rings is used in conjunction with the middle sealing ring. During operation, the protruding structure on the sealing ring forms a scraper-like structure at the contact point between the outer wall of the sealing ring and the inner wall of the sleeve. When the valve core assembly moves the sealing structure relative to the sleeve, the scraper located at the front of the medium flow direction cleans the inner wall of the sleeve, ensuring that the inner wall of the sleeve is free of debris, preventing jamming and damage to the valve core and sealing ring, and enabling long-term valve use.

[0008] Furthermore, the cross-section of the upper sealing ring annular structure is V-shaped, with two upper protrusions symmetrically arranged as the two sides of the V-shaped structure, and the lower protrusion being the tip of the V-shaped structure.

[0009] Furthermore, the upper sealing ring has a deformation groove recessed on its concave sealing surface corresponding to the bottom connection position of the two upper protrusions. The design of the deformation groove provides space for multiple sealing rings to be assembled sequentially and deformed under pressure.

[0010] Preferably, the deformation groove is a square groove. The design of the square groove provides deformation space for both the opening and closing of the V-shaped structure.

[0011] Furthermore, the inner and outer circumferential surfaces of the annular structure of the intermediate sealing ring are respectively recessed inward to form auxiliary balancing grooves, so that the intermediate sealing ring can deform not only under the force on the upper and lower end faces, but also on the inner and outer circumferential walls, thereby stably sealing the valve core assembly and the sleeve, and providing effective pressure transmission, so that the sealing ring located behind the medium flow also has good sealing performance.

[0012] Preferably, the cross-section of the intermediate sealing ring annular structure is X-shaped, with the upper opening of the X-shaped structure being the upper sealing surface of the intermediate sealing ring, the lower opening being the lower sealing surface, and the openings on both sides being auxiliary balancing grooves.

[0013] The beneficial effects of this utility model are that the bidirectional sealing structure of the high-pressure valve core provided by this utility model adopts a split structure design and is composed of multiple sealing rings. While ensuring the sealing effect, it is not limited by the direction of medium flow and can be combined according to the direction of medium flow. Moreover, the specific combination method can be applied to valves with bidirectional medium flow. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the sealing structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the upper or lower sealing ring in the sealing structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the middle sealing ring in the sealing structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the sealing structure of this utility model installed inside a valve when the direction of medium flow is not limited.

[0019] Figure 5 This is a schematic diagram of the sealing structure of this utility model installed inside the valve when the medium enters at a low speed and exits at a high speed.

[0020] Figure 6 This is a schematic diagram of the sealing structure of this utility model installed inside the valve when the medium flows in at a high inlet and out at a low outlet.

[0021] In the figure: 1. Upper sealing ring; 2. Middle sealing ring; 3. Lower sealing ring; 4. Concave sealing surface; 5. Raised sealing surface; 6. Deformation groove; 7. Auxiliary balancing groove; 8. Pressure cap; 9. Valve core assembly; 10. Sleeve. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0023] like Figure 1 The illustrated bidirectional sealing structure for a high-pressure valve core is an embodiment of this utility model. This sealing structure is disposed between the valve core assembly 9 and the sleeve 10, and from top to bottom includes an upper sealing ring 1, a middle sealing ring 2, and a lower sealing ring 3. During assembly into the valve, a sealing groove is typically machined on the outer wall of the valve core assembly 9. The sealing structure is then fitted into the sealing groove using a gland 8 and bolts, thus positioning and fixing the sealing structure to the valve core assembly 9. This pressing also applies pressure to the sealing structure, causing it to deform. The outer wall of the sealing structure then dynamically seals against the inner wall of the sleeve 10, forming a seal between the valve core assembly 9 and the sleeve 10. During this process, adjusting the clamping force of the gland 8 allows for adjustment of the compression of the sealing structure as needed, reducing friction on the valve's internal components.

[0024] In this embodiment, the upper sealing ring 1, the middle sealing ring 2, and the lower sealing ring 3 are all annular structures. The inner wall of the annular structure is statically sealed to the outer wall of the valve core assembly, and the outer wall of the annular structure is dynamically sealed to the inner wall of the sleeve 10. There is one middle sealing ring 2. The upper sealing ring 1 is positioned above the middle sealing ring 2, and the lower sealing ring 3 is positioned below the middle sealing ring 2. The annular structures of the upper sealing ring 1 and the lower sealing ring 3 are identical, and their sealing surfaces are reversed. The number of upper sealing rings 1 and lower sealing rings 3 is configured and assembled as needed according to the flow direction of the medium within the valve. The material of the sealing rings is selected based on the chemical properties of the medium and the valve pressure, choosing a metal or compound material that can undergo a certain deformation under pressure.

[0025] Specifically, such as Figure 2As shown, one end face of the annular structure of the upper sealing ring 1 has two upper protrusions, forming a concave sealing surface 4 between the two upper protrusions. The other end face of the annular structure has a protruding lower protrusion, the surface of which forms a raised sealing surface 5 of the upper sealing ring 1. In this embodiment, the upper and lower protrusions of the upper sealing ring 1 make the annular structure of the upper sealing ring 1 V-shaped. The two upper protrusions are symmetrically set as the two sides of the V-shaped structure, and the lower protrusion is the tip of the V-shaped structure. A square-section deformation groove 6 is recessed on the concave sealing surface 4 of the upper sealing ring 1 at the bottom connection position of the two upper protrusions, that is, at the position corresponding to the tip of the V-shaped structure. The deformation groove 6 provides deformation space for the opening and closing of the V-shaped structure, which facilitates the sequential assembly of multiple sealing rings and their deformation under pressure to form an effective sealing structure.

[0026] like Figure 3 As shown, the annular structure of the intermediate sealing ring 2 has two protrusions on both the upper and lower end faces. The two protrusions on the same end face form the sealing surface of the intermediate sealing ring 2. The inner and outer circumferential surfaces of the annular structure are respectively recessed inward to form auxiliary balancing grooves 7. In this embodiment, the cross-section of the annular structure of the intermediate sealing ring 2 is X-shaped. The upper opening of the X-shaped structure is the upper sealing surface of the intermediate sealing ring 2, the lower opening is the lower sealing surface, and the openings on both sides are the auxiliary balancing grooves 7. The X-shaped structure has openings at both the top and bottom. When subjected to pressure, it deforms and the openings open outward. Since both the upper and lower ends can deform, both the upper and lower ends of the intermediate sealing ring 2 can form an effective sealing structure.

[0027] The auxiliary balancing grooves 7 on the inner and outer walls of the intermediate sealing ring 2 allow the intermediate sealing ring 2 to deform not only at its upper and lower ends, but also on its circumferential inner and outer walls. The deformation of the circumferential inner and outer walls can more stably seal the valve core assembly 9 and the sleeve 10, and can provide effective pressure transmission, so that the sealing ring located behind the medium flow also has good sealing performance.

[0028] The design of multiple sealing rings ensures effective sealing even after partial wear due to the labyrinth effect. The number of sealing rings can be customized based on valve size and operating conditions. Furthermore, the V-shaped structure of the upper sealing ring 1 or lower sealing ring 3 at both ends expands outward under pressure, forming a multi-layered "scraper" effect relative to the inner wall of the sleeve 10. When the valve core assembly 9 moves the sealing structure relative to the sleeve 10, it scrapes and cleans the inner wall of the sleeve 10 when the medium is viscous or contains fine particles, effectively ensuring the sleeve 10 is free of debris, protecting the downstream sealing performance, preventing jamming and damage to the valve core and sealing rings, and enabling long-term valve use.

[0029] Based on the design of each of the above sealing rings, the upper sealing ring 1, the middle sealing ring 2 and the lower sealing ring 3 can be used to achieve a variety of assembly methods for the sealing structure, thereby meeting the sealing requirements of different working conditions.

[0030] 1. Unrestricted medium flow direction, bidirectional sealing:

[0031] like Figure 4 As shown, the number of upper sealing rings 1 and lower sealing rings 3 is the same. The V-shaped opening of the upper sealing ring 1 faces upward. After assembly, the middle sealing ring 2 is installed in the middle, and the lower sealing rings 3 are installed below the middle sealing ring 2. Bidirectional sealing can be achieved without splitting the flow direction of the medium, eliminating the need to disassemble the valve and change the sealing direction of the sealing rings. In the stress distribution of the sealing structure, the upper sealing ring 1 experiences downward pressure, and the angle of the V-shaped opening of the upper sealing ring 1 gradually decreases from top to bottom. The lower sealing ring 3 operates in the opposite direction to the upper sealing ring 1, with the V-shaped opening angle gradually decreasing from bottom to top. The bidirectional forces are balanced at the position of the middle sealing ring 2, achieving a bidirectional sealing effect.

[0032] 2. Medium inlet low, outlet high

[0033] like Figure 5 As shown, the assembly uses a configuration with fewer upper sealing rings 1 and more lower sealing rings 3. This combination is suitable for use in situations requiring a long-term low-inlet, high-outlet flow pattern.

[0034] In this combination, the front end of the upper sealing ring mainly acts as a "scraper," effectively cleaning when the medium is viscous or contains fine particles, thus protecting the sealing performance of the rear end.

[0035] The lower sealing ring consists of at least two sets. The front sealing ring mainly acts as a scraper, which can effectively clean the medium when it is viscous or contains fine particles, and protect the sealing performance of the rear end. The rear end can achieve a low-frequency side-entry and low-exit sealing, and is not suitable for long-term use.

[0036] 3. Medium high inlet, low outlet

[0037] like Figure 6 As shown, the assembly adopts an arrangement with a large number of upper sealing rings 1 and a small number of lower sealing rings 3. This combination method is the opposite of the number arrangement when the medium flows from low to high, but the main function of the resulting sealing structure is the same, the medium flow is reversed, and the sealing emphasis of the overall sealing structure is reversed.

[0038] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A bidirectional sealing structure for a high-pressure valve core, disposed between the valve core assembly (9) and the sleeve (10), characterized in that: It includes several upper sealing rings (1), several intermediate sealing rings (2) and several lower sealing rings (3) that are fitted together from top to bottom. The upper sealing rings (1), intermediate sealing rings (2) and lower sealing rings (3) are all annular structures. The inner wall of the annular structure is precisely sealed with the outer wall of the valve core assembly, and the outer wall of the annular structure is dynamically sealed with the inner wall of the sleeve (10). The annular structure of the upper sealing ring (1) has two upper protrusions on one side end face, and the two upper protrusions form a concave sealing surface (4) of the upper sealing ring (1). The other side end face of the annular structure has a protrusion with a lower protrusion, and the surface of the lower protrusion forms a raised sealing surface (5) of the upper sealing ring (1). The annular structure of the intermediate sealing ring (2) has two protrusions on both ends of the ring structure, and the sealing surface of the intermediate sealing ring (2) is formed between the two protrusions on the same end face; The lower sealing ring (3) has the same annular structure as the upper sealing ring (1), and the sealing surfaces are reversed. The raised sealing surface (5) of the upper sealing ring (1) that is not at the bottom mates with the recessed sealing surface (4) of the upper sealing ring (1) below it. The raised sealing surface (5) of the upper sealing ring (1) at the bottom mates with the sealing surface of the middle sealing ring (2) at the top. The sealing surface of the middle sealing ring (2) at the bottom mates with the raised sealing surface (5) of the lower sealing ring (3) at the top.

2. The bidirectional sealing structure of the high-pressure valve core as described in claim 1, characterized in that: The upper sealing ring (1) has a V-shaped cross-section, with two upper protrusions symmetrically arranged as the two sides of the V-shaped structure, and the lower protrusion as the tip of the V-shaped structure.

3. The bidirectional sealing structure of the high-pressure valve core as described in claim 2, characterized in that: The upper sealing ring (1) has a deformation groove (6) on the concave sealing surface (4) corresponding to the bottom connection position of the two upper protrusions.

4. The bidirectional sealing structure of the high-pressure valve core as described in claim 3, characterized in that: The deformation groove (6) is a square groove.

5. The bidirectional sealing structure of the high-pressure valve core as described in claim 1, characterized in that: The inner and outer circumferential surfaces of the annular structure of the intermediate sealing ring (2) are respectively recessed inward to form auxiliary balancing grooves (7).

6. The bidirectional sealing structure of the high-pressure valve core as described in claim 5, characterized in that: The cross-section of the annular structure of the intermediate sealing ring (2) is X-shaped. The upper opening of the X-shaped structure is the upper sealing surface of the intermediate sealing ring (2), the lower opening is the lower sealing surface, and the openings on both sides are auxiliary balance grooves (7).

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