A sealing structure of a ball valve body

Abstract

The utility model relates to valve technical field especially is related to a kind of sealing structure of ball valve body, including main valve body, auxiliary valve body and ball, main flange is equipped on the main valve body, auxiliary flange is equipped on the auxiliary valve body and is in line with main flange, still including first sealing ring and second sealing ring, the first sealing ring is used to cooperate with ball sealing, second sealing ring is clamped between main flange and auxiliary flange, and the inner periphery of second sealing ring is in line with the outer periphery of first sealing ring, the inner edge of auxiliary flange is equipped with the first embedding groove for the first sealing ring embedding, the inner edge of second sealing ring also extends with extension ring, the extension ring is clamped between first sealing ring and first embedding groove, second sealing ring adopts stainless steel material quality, the utility model is formed hard sealing between main valve body and auxiliary valve body by the sealing ring of stainless steel material quality, stainless steel has the characteristics of high temperature resistance, corrosion resistance, can keep the integrity of sealing surface.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a sealing structure for a ball valve body. Background Technology

[0002] A ball valve is a type of valve whose opening and closing element is a ball driven by a valve stem that rotates around the valve axis. Due to its reliable sealing, simple structure, and convenient maintenance, the ball valve has become one of the most widely used valves.

[0003] As one of the most important components of a ball valve, the valve body bears the responsibility of connecting pipelines. To facilitate installation and processing, the valve body usually adopts a split structure, that is, the main valve body and the auxiliary valve body are connected by flanges and then fixed by fasteners. However, the main valve body and the auxiliary valve body do not have a good sealing structure. For example, if the medium is a high-temperature corrosive liquid, the flange sealing surface will leak due to corrosion.

[0004] The purpose of this invention is to propose corresponding solutions to the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a sealing structure for a ball valve body. This invention uses a stainless steel sealing ring to form a hard seal between the main valve body and the auxiliary valve body. Stainless steel has the characteristics of high temperature resistance and corrosion resistance, and can maintain the integrity of the sealing surface.

[0006] The technical solution adopted by this utility model is as follows: A sealing structure for a ball valve body includes a main valve body, a secondary valve body, and a ball. The main valve body is provided with a main flange, and the secondary valve body is provided with a secondary flange that fits and connects with the main flange. The main flange is connected to the secondary flange by fasteners. The connection between the main valve body and the secondary valve body forms a rotating cavity for the ball to rotate. It also includes a first sealing ring and a second sealing ring. The first sealing ring is used for sealing and cooperating with the ball. The second sealing ring is sandwiched between the main flange and the secondary flange, and the inner circumference of the second sealing ring fits with the outer circumference of the first sealing ring. The inner edge of the secondary flange is provided with a first groove for the first sealing ring to be embedded. The inner edge of the second sealing ring also extends with an extension ring. The extension ring is sandwiched between the first sealing ring and the first groove. The second sealing ring is made of stainless steel.

[0007] The main flange is provided with an annular groove for embedding the second sealing ring. The inner circumferential wall of the annular groove is provided with a number of protrusions, which are evenly distributed along the circumference of the annular groove. The outer circumferential wall of the second sealing ring is provided with a number of recesses that match the protrusions.

[0008] The main flange is provided with an annular groove for embedding the second sealing ring. The inner sidewall of the annular groove is provided with a number of slots, which are evenly distributed along the circumference of the annular groove. The end face of the second sealing ring is provided with a number of protrusions that are adapted to the slots.

[0009] The two ends of several of the protrusions extend to the inner and outer edges of the second sealing ring, respectively, and the several slots extend radially to communicate with the rotating cavity.

[0010] It also includes an elastic sealing ring, and the secondary flange is provided with a second groove concentric with the first groove. The outer peripheral wall of the second sealing ring fits against the inner peripheral wall of the second groove, and the elastic sealing ring is abutted between the second groove and the second sealing ring.

[0011] The second sealing ring covers one side of the elastic sealing ring, and the end of the elastic sealing ring away from the second sealing ring abuts against the inner wall of the second groove.

[0012] The fasteners include several sets of bolts and nuts. The bolts pass through the main flange and the sub-flange in sequence to form a threaded engagement. The nuts are threadedly engaged with one end of the bolts that passes through the sub-flange. The fasteners also include several anti-loosening plates sandwiched between two adjacent sets of nuts and the sub-flange. Both ends of the anti-loosening plates are bent to have anti-rotation parts that abut against the sidewalls of the nuts.

[0013] The beneficial effects of this utility model are as follows: A hard seal is formed by a second sealing ring made of stainless steel sandwiched between the main flange and the secondary flange. Stainless steel has the characteristics of high temperature resistance and corrosion resistance. Even under the long-term action of high temperature corrosive media, it can maintain the integrity and stability of the sealing surface, fundamentally solving the problem of flange sealing surface leakage due to corrosion in the prior art. Moreover, the inner circumference of the second sealing ring fits with the outer circumference of the first sealing ring. The first groove set on the inner edge of the secondary flange allows the first sealing ring to be embedded. Combined with the extension ring on the inner edge of the second sealing ring sandwiched between the first sealing ring and the first groove, multiple sealing barriers are formed, effectively preventing the medium from leaking from the flange connection. It is especially suitable for high pressure or vacuum conditions, realizing the precise positioning and tight fit of the sealing ring, reducing the risk of displacement or deformation of the sealing ring, improving the rigidity and sealing durability of the overall structure. The sealing structure is simple in design, compatible with existing split valve bodies, and can be assembled without complex tools or processes, reducing production and maintenance costs, while extending the service life of the ball valve. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 for Figure 2 A magnified view of a portion of point A in the middle; Figure 4 This is a schematic diagram of the secondary valve body in this utility model; Figure 5 This is a schematic diagram of the main valve body in this utility model; Figure 6 This is a schematic diagram of the structure in which the first sealing ring and the second sealing ring are installed on the secondary valve body in this utility model; Figure 7 This is a schematic diagram of the main valve body in another embodiment of the present invention; Figure 8 This is a schematic diagram of the secondary valve body in another embodiment of the present invention; In the diagram, 1-main valve body, 2-subsidiary valve body, 3-ball, 4-main flange, 5-subsidiary flange, 6-rotating cavity, 7-first sealing ring, 8-second sealing ring, 9-first groove, 10-extension ring, 11-annular groove, 12-protrusion, 13-recess, 14-slot, 15-raised strip, 16-elastic sealing ring, 17-second groove, 18-bolt, 19-nut, 20-anti-loosening plate, 21-anti-rotation part. Detailed Implementation

[0016] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0017] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0018] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0019] like Figures 1 to 8 The diagram illustrates an embodiment of the present invention: a sealing structure for a ball valve body, comprising a main valve body 1, a secondary valve body 2, and a ball 3. The main valve body 1 is provided with a main flange 4, and the secondary valve body 2 is provided with a secondary flange 5 that fits and engages with the main flange 4. The main flange 4 is connected to the secondary flange 5 by fasteners. The connection between the main valve body 1 and the secondary valve body 2 forms a rotating cavity 6 for the ball 3 to rotate. The structure also includes a first sealing ring 7 and a second sealing ring 8. The first sealing ring 7 is used for sealing and engaging with the ball 3. The second sealing ring 8 is sandwiched between the main flange 4 and the secondary flange 5, and the inner circumference of the second sealing ring 8 fits against the outer circumference of the first sealing ring 7. The inner edge of the secondary flange 5 is provided with a first groove 9 for the first sealing ring 7 to be embedded in. The inner edge of the second sealing ring 8 also extends with an extension ring 10, which is sandwiched between the first sealing ring 7 and the first groove 9. The second sealing ring 8 is made of stainless steel.

[0020] The beneficial effects of this design are as follows: a hard seal is formed by a second stainless steel sealing ring sandwiched between the main flange and the secondary flange. Stainless steel has the characteristics of high temperature resistance and corrosion resistance, and can maintain the integrity and stability of the sealing surface even under long-term action of high-temperature corrosive media. This fundamentally solves the problem of flange sealing surface leakage due to corrosion in the background technology. Furthermore, the inner circumference of the second sealing ring fits into the outer circumference of the first sealing ring. The first groove set on the inner edge of the secondary flange allows the first sealing ring to be embedded. Combined with the extension ring on the inner edge of the second sealing ring sandwiched between the first sealing ring and the first groove, multiple sealing barriers are formed, effectively preventing the medium from leaking from the flange connection. It is especially suitable for high-pressure or vacuum conditions, achieving precise positioning and tight fit of the sealing ring, reducing the risk of displacement or deformation of the sealing ring, and improving the rigidity and sealing durability of the overall structure. This sealing structure is simple in design, compatible with existing split valve bodies, and can be assembled without complex tools or processes, reducing production and maintenance costs, while extending the service life of the ball valve.

[0021] Further, the main flange 4 is provided with an annular groove 11 for the second sealing ring 8 to be embedded. The inner circumferential wall of the annular groove 11 is provided with a plurality of protrusions 12, which are evenly distributed around the annular groove 11. The outer circumferential wall of the second sealing ring 8 is provided with a plurality of recesses 13 that are adapted to the protrusions 12.

[0022] The beneficial effects of this design are as follows: the interlocking of the protrusions and recesses forms a reliable anti-rotation mechanism, which can effectively resist the torsional force generated during the installation of fasteners or valve operation, prevent the second sealing ring from shifting or rotating, and ensure the fixed sealing position, thereby improving the reliability of the seal. By preventing the second sealing ring from moving around, it also ensures that the flange tightening force is evenly applied to the second sealing ring, so that it can continuously and stably provide sealing pressure. Even under fluctuating operating conditions or long-term vibration environments, it can effectively avoid the risk of leakage caused by the displacement of the sealing ring.

[0023] Further, it also includes an elastic sealing ring 16, and the secondary flange 5 is also provided with a second groove 17 concentric with the first groove 9. The outer peripheral wall of the second sealing ring 8 is in contact with the inner peripheral wall of the second groove 17, and the elastic sealing ring 16 is abutted between the second groove 17 and the second sealing ring 8.

[0024] The beneficial effects of this design are as follows: by combining the elastic sealing ring with the stainless steel second sealing ring, a combination of hard sealing and elastic sealing is formed, which combines the advantages of both types of sealing. The sealing contact surface is formed by the second sealing ring, and the outer peripheral wall of the second sealing ring can also seal the second groove. The elastic sealing ring is set in the second groove, which will not come into contact with the medium to prevent corrosion. It can also provide self-compensation of the sealing gap through compression rebound characteristics, so that the second sealing ring can achieve dynamic hard sealing, thereby improving the reliability and durability of the seal.

[0025] In a further configuration, the second sealing ring 8 covers one side of the elastic sealing ring 16, and the end of the elastic sealing ring 16 away from the second sealing ring 8 abuts against the inner wall of the second groove 17.

[0026] The beneficial effects of this design are as follows: the rigid second sealing ring and the elastic sealing ring are combined into a functional unit. The second sealing ring, as the main body facing the medium, directly resists corrosion and erosion; while the elastic sealing ring on the covered side is dedicated to compensation and following. The two complement each other and together form a composite seal with performance far exceeding that of a single material. The structure covered by the second sealing ring provides a robust protective shield for the elastic sealing ring, effectively preventing the elastic sealing ring from being squeezed out or damaged.

[0027] Further, the fastener includes several sets of bolts 18 and nuts 19. The bolts 18 pass through the main flange 4 and the sub-flange 5 in sequence to form a threaded engagement. The nuts 19 are threadedly engaged with one end of the bolts 18 that passes through the sub-flange 5. The fastener also includes several anti-loosening plates 20 sandwiched between two adjacent sets of nuts 19 and the sub-flange 5. Both ends of the anti-loosening plates 20 are bent to have anti-rotation parts 21 that abut against the sidewalls of the nuts 19.

[0028] The beneficial effects of this design are as follows: by installing anti-loosening plates between each nut and the sub-flange, and ensuring that the anti-rotation parts at both ends of the anti-rotation plates firmly abut against the sidewalls of the nut, the possibility of the nut rotating and loosening under long-term operation or vibration environment is effectively limited. This ensures that the fastening force at the flange connection is stable and durable, thereby maintaining a constant pressure on sealing elements such as the second sealing ring, avoiding sealing failure and media leakage caused by the decay of fastening force. The anti-loosening plates have a simple structure and are easy to install. There is no need to change the standard specifications of the bolts and nuts. Anti-loosening can be achieved through a simple mechanical interlocking principle.

[0029] Further, the main flange 4 is provided with an annular groove 11 for the second sealing ring 8 to be embedded. The inner side wall of the annular groove 11 is provided with a plurality of slots 14, which are evenly distributed around the annular groove 11. The end face of the second sealing ring 8 is provided with a plurality of protrusions 15 that are adapted to the slots 14.

[0030] The beneficial effects of this design are as follows: In another embodiment of this utility model, the fitting of the protrusion and the groove not only prevents the second sealing ring from rotating, but also provides axial positioning for the second sealing ring, effectively limiting the small axial displacement that may occur when the sealing ring is under pressure or vibration, ensuring that it is always in the optimal working position in the annular groove, thereby maintaining the stability of the sealing pressure. Furthermore, placing the protrusion on the end face of the second sealing ring can also keep the outer peripheral wall smooth and intact, ensuring that the contact surfaces of the second sealing ring and the main flange and the secondary flange are tightly fitted.

[0031] Further, the two ends of several of the protrusions 15 extend to the inner and outer edges of the second sealing ring 8, respectively, and several of the slots 14 extend radially to communicate with the rotating cavity 6.

[0032] The beneficial effects of this design are as follows: the extended and evenly distributed ridges on the end face of the second sealing ring improve the overall rigidity and stability of the second sealing ring, effectively resisting the risk of the inner edge of the second sealing ring being squeezed into the rotating cavity or deformed under high pressure, thus ensuring the integrity of the sealing surface and the long-term reliability of the seal. The groove and the ridges have a larger contact area, effectively transmitting torque, preventing circumferential rotation, and having a stronger locking effect.

[0033] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A sealing structure for a ball valve body, comprising a main valve body (1), a secondary valve body (2), and a ball (3), wherein the main valve body (1) is provided with a main flange (4), and the secondary valve body (2) is provided with a secondary flange (5) that fits and abuts against the main flange (4), the main flange (4) is connected to the secondary flange (5) by fasteners, and the main valve body (1) and the secondary valve body (2) are connected to form a rotating cavity (6) for the ball (3) to rotate, characterized in that: It also includes a first sealing ring (7) and a second sealing ring (8). The first sealing ring (7) is used to seal with the ball (3). The second sealing ring (8) is sandwiched between the main flange (4) and the auxiliary flange (5), and the inner circumference of the second sealing ring (8) is in contact with the outer circumference of the first sealing ring (7). The inner edge of the auxiliary flange (5) is provided with a first groove (9) for the first sealing ring (7) to be inserted. The inner edge of the second sealing ring (8) also extends with an extension ring (10). The extension ring (10) is sandwiched between the first sealing ring (7) and the first groove (9). The second sealing ring (8) is made of stainless steel.

2. The sealing structure of a ball valve body according to claim 1, characterized in that: The main flange (4) is provided with an annular groove (11) for the second sealing ring (8) to be embedded. The inner circumferential wall of the annular groove (11) is provided with a number of protrusions (12). The number of protrusions (12) are evenly distributed along the circumference of the annular groove (11). The outer circumferential wall of the second sealing ring (8) is provided with a number of recesses (13) that are adapted to the protrusions (12).

3. The sealing structure of a ball valve body according to claim 1, characterized in that: The main flange (4) is provided with an annular groove (11) for the second sealing ring (8) to be embedded. The inner side wall of the annular groove (11) is provided with a number of slots (14). The slots (14) are evenly distributed around the annular groove (11). The end face of the second sealing ring (8) is provided with a number of protrusions (15) that are adapted to the slots (14).

4. The sealing structure of a ball valve body according to claim 3, characterized in that: The two ends of several of the protrusions (15) extend to the inner and outer edges of the second sealing ring (8), respectively, and the several slots (14) extend radially to communicate with the rotating cavity (6).

5. The sealing structure of a ball valve body according to claim 1, characterized in that: It also includes an elastic sealing ring (16), and the secondary flange (5) is also provided with a second groove (17) concentric with the first groove (9). The outer peripheral wall of the second sealing ring (8) fits against the inner peripheral wall of the second groove (17), and the elastic sealing ring (16) is abutted between the second groove (17) and the second sealing ring (8).

6. The sealing structure of a ball valve body according to claim 5, characterized in that: The second sealing ring (8) covers one side of the elastic sealing ring (16), and the end of the elastic sealing ring (16) away from the second sealing ring (8) abuts against the inner wall of the second groove (17).

7. The sealing structure of a ball valve body according to claim 1, characterized in that: The fasteners include several sets of bolts (18) and nuts (19). The bolts (18) pass through the main flange (4) and the sub-flange (5) in sequence to form a threaded engagement. The nuts (19) are threadedly engaged with one end of the bolts (18) that passes through the sub-flange (5). The fasteners also include several anti-loosening plates (20) sandwiched between two adjacent sets of nuts (19) and the sub-flange (5). Both ends of the anti-loosening plates (20) are bent to have anti-rotation parts (21) that abut against the side wall of the nuts (19).

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