Fixed ball valve with carbide seal

Abstract

The utility model relates to ball valve technical field, concretely is a kind of fixed ball valve with hard alloy sealing structure, the ball valve seat is fixedly arranged positioner near the one end of ball valve body, the inside of positioner is equipped with empty slot, annular sealing plate is equipped in empty slot, the side of annular sealing plate near ball valve body is equipped with camber, empty slot inside is equipped with multiple cavities, spring is equipped in cavity, the rear end of annular sealing plate is equipped with locating block, annular sealing plate adopts hard alloy material, it has high strength and wear resistance, its camber and ball block outer wall are pasted and form main sealing surface, cooperate spring and the continuous thrust of annular sealing plate through locating block, ensure that ball block and annular sealing plate are always closely contacted, effectively avoid medium leakage, the detachable sealing ring in annular groove forms auxiliary seal under the extrusion of positioning seat and positioner, and the sealing performance of double sealing structure is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, specifically a fixed ball valve with a hard alloy sealing structure. Background Technology

[0002] As a core component for media cutoff and flow control in industrial pipeline systems, fixed ball valves are widely used in petroleum, chemical, natural gas, metallurgical and other fields. Their sealing performance directly determines the safety and stability of pipeline operation.

[0003] In the existing sealing structure of fixed ball valves, the sealing surface is mostly made of ordinary metal or conventional polymer materials, which have limited wear resistance and structural strength. During long-term opening and closing, the seal is prone to failure due to frictional wear, which can lead to media leakage. The sealing structure lacks an effective elastic compensation mechanism. When the operating temperature and pressure fluctuate, the seal and the ball stop are difficult to maintain a continuous tight fit, resulting in a significant decrease in sealing reliability.

[0004] These problems result in significant limitations in the use of existing fixed ball valves under complex operating conditions, making it difficult to meet the requirements of industrial production for sealing durability, structural stability, and ease of maintenance. Utility Model Content

[0005] Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a fixed ball valve with a hard alloy sealing structure.

[0006] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a fixed ball valve with a hard alloy sealing structure, comprising a ball valve body, two ball valve seats symmetrically arranged on both sides of the ball valve body, a ball stop provided inside the ball valve body, a rocker arm for driving the ball stop to rotate provided at the top of the ball valve body, a positioning frame fixedly provided at one end of the ball valve seat near the ball valve body, a groove provided inside the positioning frame, an annular sealing plate provided in the groove, an arc surface provided on the side of the annular sealing plate near the ball valve body, multiple cavities provided inside the groove, springs provided in the cavities, a positioning block provided at the rear end of the annular sealing plate, the positioning block being inserted into the cavity and slidingly engaged with the cavity, one end of the spring being fixed inside the cavity, and the other end being connected to the positioning block; The annular sealing plate has an annular groove on the side near the positioning seat, and a removable sealing ring is provided in the annular groove.

[0007] To facilitate assembly of the ball valve seat, the present invention includes the following improvement: two positioning seats are symmetrically arranged on both sides of the ball valve body, and the positioning frame is fixed to the positioning seats by bolts.

[0008] To improve the stability of the annular sealing plate during use, the present invention includes the following improvements: the periphery of the hollow groove is provided with multiple guide grooves, and the periphery of the annular sealing plate is provided with multiple guide blocks that are inserted into the guide grooves and slidably connected with the positioning frame. The cross-section of the guide block is T-shaped, and the guide block fits tightly with the guide groove.

[0009] Furthermore, an improvement of this utility model is that the positioning block, the annular sealing plate, and the guide block are an integrated structure.

[0010] Furthermore, an improvement of this utility model is that the annular sealing plate is made of hard alloy.

[0011] (III) Beneficial Effects Compared with the prior art, this utility model provides a fixed ball valve with a hard alloy sealing structure, which has the following advantages: The annular sealing plate is made of hard alloy material, which has both high strength and wear resistance. Its arc surface fits against the outer wall of the ball stop to form the main sealing surface. With the continuous thrust of the spring through the positioning block on the annular sealing plate, it ensures that the ball stop and the annular sealing plate are always in close contact, effectively preventing media leakage. The detachable sealing ring in the annular groove forms an auxiliary seal under the compression of the positioning seat and positioning frame. The double sealing structure greatly improves the sealing performance. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This utility model Figure 1 A magnified schematic diagram of the local structure at point A; Figure 4 This is a schematic diagram of the installation structure of the annular sealing plate in this utility model.

[0013] In the diagram: 1. Ball valve body; 2. Positioning seat; 3. Ball stop; 4. Rocker arm; 5. Ball valve seat; 6. Positioning bracket; 7. Hollow groove; 8. Annular sealing plate; 9. Annular groove; 10. Guide block; 11. Guide groove; 12. Sealing ring; 13. Cavity; 14. Positioning block; 15. Spring. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figures 1-4 This utility model proposes a fixed ball valve with a hard alloy sealing structure, including a ball valve body 1, two ball valve seats 5 symmetrically arranged on both sides of the ball valve body 1, a ball stop 3 provided inside the ball valve body 1, and a rocker 4 for driving the ball stop 3 to rotate at the top of the ball valve body 1. A positioning frame 6 is fixedly provided at one end of the ball valve seat 5 near the ball valve body 1. A groove 7 is provided inside the positioning frame 6. An annular sealing plate 8 is provided in the groove 7. An arc surface is provided on the side of the annular sealing plate 8 near the ball valve body 1. Multiple cavities 13 are provided inside the groove 7. Springs 15 are provided in the cavities 13. A positioning block 14 is provided at the rear end of the annular sealing plate 8. The positioning block 14 is inserted into the cavity 13 and slides with the cavity 13. One end of the spring 15 is fixed inside the cavity 13, and the other end is connected to the positioning block 14. The annular sealing plate 8 has an annular groove 9 on the side near the positioning seat 2, and a detachable sealing ring 12 is provided in the annular groove 9.

[0016] The assembly and operation process of this fixed ball valve with a hard alloy sealing structure is as follows: Two positioning seats 2 are symmetrically arranged on both sides of the ball valve body 1, and the positioning frame 6 is fixed to the positioning seat 2 by bolts.

[0017] First, fix the two positioning seats 2 symmetrically on both sides of the ball valve body 1. Then, connect the ball valve seat 5 to the positioning seat 2 through the positioning bracket 6. The positioning bracket 6 and the positioning seat 2 are fastened together with bolts to complete the basic assembly of the ball valve seat 5 and the ball valve body 1.

[0018] Subsequently, the sealing structure is assembled: The hollow groove 7 has multiple guide grooves 11 on its periphery, and the annular sealing plate 8 has multiple guide blocks 10 that are inserted into the guide grooves 11 and slidably connected to the positioning frame 6 on its periphery. The guide block 10 has a T-shaped cross section and fits tightly with the guide groove 11.

[0019] The positioning block 14, the annular sealing plate 8, and the guide block 10 are an integrated structure.

[0020] The annular sealing plate 8 is made of hard alloy.

[0021] When the annular sealing plate 8 is installed into the empty groove 7 inside the positioning frame 6, the guide block 10 on the periphery of the annular sealing plate 8 is inserted into the guide groove 11 on the periphery of the empty groove 7. Since the cross section of the guide block 10 is T-shaped and it fits tightly with the guide groove 11, the annular sealing plate 8 can be stably limited and can slide along the guide groove 11. Meanwhile, the positioning block 14 at the rear end of the annular sealing plate 8 is inserted into the cavity 13 inside the slot 7. One end of the spring 15 inside the cavity 13 is fixed to the bottom of the cavity 13, and the other end is connected to the positioning block 14 to form an elastic support structure.

[0022] In addition, a detachable sealing ring 12 is installed in the annular groove 9 on the side of the annular sealing plate 8 near the positioning seat 2, thus completing the assembly of the sealing assembly.

[0023] In use, the rocker arm 4 at the top of the ball valve body 1 drives the internal ball stop 3 to rotate. When the valve is closed, the outer wall of the ball stop 3 is tightly fitted with the arc surface of the annular sealing plate 8 near the ball valve body 1. The compression of the annular sealing plate 8 by the ball stop 3 causes the positioning block 14 to slide in the cavity 13 and compress the spring 15. The rebound force of the spring 15 continuously pushes the annular sealing plate 8 to ensure that it is always tightly fitted with the ball stop 3, thus achieving a seal. At the same time, after the positioning seat 2 and the positioning frame 6 are fastened with bolts, the positioning seat 2 squeezes the sealing ring 12 on the annular sealing plate 8, further blocking the gap between the positioning seat 2 and the positioning frame 6, forming a secondary seal.

[0024] When the valve is opened, the rocker arm 4 drives the ball stop 3 to rotate. The ball stop 3 slides on the arc surface of the annular sealing plate 8, and the medium flows along the flow channel. At this time, the spring 15 will still provide an elastic force to the annular sealing plate 8, which can ensure the sealing of the contact surface between the annular sealing plate 8 and the outer wall of the ball stop 3.

[0025] The positioning frame 6 and the positioning base 2 are fixed by bolts, which makes the connection stable and easy to disassemble and assemble. The guide block 10 of the annular sealing plate 8 and the guide groove 11 of the positioning frame 6 are in a T-shape and tightly fitted, which not only prevents the annular sealing plate 8 from shifting left and right, but also ensures its smooth axial sliding and avoids misalignment of the sealing surface. The positioning block 14, the annular sealing plate 8, and the guide block 10 are integrated into one structure, which enhances the overall rigidity of the sealing assembly and reduces assembly errors.

[0026] Selection of sealing ring 12: Fluororubber sealing rings: Suitable for high-temperature (-20℃~200℃) and highly corrosive media (such as acid and alkali solutions, organic solvents). Fluororubber has excellent chemical stability and aging resistance, low compression set, and can tightly fill the annular groove 9 under the compression of the positioning seat 2 and positioning frame 6, maintaining sealing performance for a long time. It also has good compatibility with hard alloy annular sealing plates 8, with no risk of corrosion due to material mismatch.

[0027] Nitrile rubber sealing rings: suitable for use in environments with normal temperatures (-40℃~120℃) and oily media (such as crude oil and hydraulic oil). Nitrile rubber exhibits excellent resistance to oily media, moderate elasticity, and is easy to install by embedding into the annular groove 9 and disassembly. It is also less expensive than fluororubber, making it suitable for conventional industrial pipeline applications.

[0028] Material selection for annular sealing plate 8: As the core component of the main sealing surface, the annular sealing plate 8 must meet the requirements of high hardness, wear resistance, impact resistance, and sealing fit with the ball stop 3. Considering the strength requirements of its integrated structure (integrated with the positioning block 14 and guide block 10), the material selection is as follows: WC-Co cemented carbide (tungsten-cobalt alloy): WC-Co alloys with a cobalt content of 8%~12% (such as YG10) are recommended. Its hardness can reach HRA89~91, exhibiting excellent wear resistance and capable of withstanding long-term friction during the opening and closing of the ball stop 3. Cobalt, as a binder phase, enhances the alloy's toughness, preventing breakage due to compression of the ball stop 3 or impact from the medium, making it suitable for working conditions containing particulate media (such as slurry and pulverized coal). Furthermore, this alloy can be ground to obtain a mirror-like arc surface with Ra≤0.05μm, ensuring a tight fit with the ball stop 3 and meeting the main sealing requirements.

[0029] WC-TiC-Co cemented carbide (tungsten-titanium-cobalt alloy): Suitable for environments with slightly higher corrosiveness (such as natural gas pipelines containing trace amounts of acid). Adding TiC improves the alloy's corrosion resistance and oxidation resistance. Its hardness is slightly higher than WC-Co alloys (HRA90~92), but its toughness is slightly lower. It needs to be used in conjunction with spring 15 for cushioning to prevent cracking due to rigid impact. Its machinability is stable, allowing for precise molding into an integrated structure with guide block 10 and positioning block 14, ensuring overall rigidity.

[0030] Ultra-fine grain cemented carbide: If both extreme wear resistance and toughness are required (such as in chemical pipelines with high-frequency opening and closing), ultra-fine grain WC-Co alloy (grain size ≤ 0.5μm) can be selected. Its hardness is comparable to that of conventional cemented carbide, but its bending strength is increased by more than 20%, which can better adapt to the alternating stress under the reciprocating push of spring 15 and extend the service life of annular sealing plate 8.

[0031] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0032] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A fixed ball valve with a hard alloy sealing structure, comprising a ball valve body (1), two ball valve seats (5) symmetrically arranged on both sides of the ball valve body (1), a ball stop (3) provided inside the ball valve body (1), and a rocker arm (4) for driving the ball stop (3) to rotate at the top of the ball valve body (1), characterized in that: The ball valve seat (5) is fixedly provided with a positioning frame (6) at one end near the ball valve body (1). The inner side of the positioning frame (6) is provided with a groove (7). An annular sealing plate (8) is provided in the groove (7). The side of the annular sealing plate (8) near the ball valve body (1) is provided with an arc surface. Multiple cavities (13) are provided inside the groove (7). Springs (15) are provided in the cavities (13). A positioning block (14) is provided at the rear end of the annular sealing plate (8). The positioning block (14) is inserted into the cavity (13) and slides with the cavity (13). One end of the spring (15) is fixed inside the cavity (13), and the other end is connected to the positioning block (14). The annular sealing plate (8) has an annular groove (9) on the side near the positioning seat (2), and a detachable sealing ring (12) is provided in the annular groove (9).

2. A fixed ball valve with a hard alloy sealing structure according to claim 1, characterized in that: Two positioning seats (2) are symmetrically arranged on both sides of the ball valve body (1), and the positioning frame (6) is fixed to the positioning seat (2) by bolts.

3. A fixed ball valve with a hard alloy sealing structure according to claim 2, characterized in that: The hollow groove (7) has multiple guide grooves (11) on its periphery, and the annular sealing plate (8) has multiple guide blocks (10) on its periphery that are inserted into the guide grooves (11) and slidably connected to the positioning frame (6).

4. A fixed ball valve with a hard alloy sealing structure according to claim 3, characterized in that: The guide block (10) has a T-shaped cross section and is tightly fitted with the guide groove (11).

5. A fixed ball valve with a hard alloy sealing structure according to claim 4, characterized in that: The positioning block (14), the annular sealing plate (8), and the guide block (10) are an integrated structure.

6. A fixed ball valve with a hard alloy sealing structure according to claim 5, characterized in that: The annular sealing plate (8) is made of hard alloy.

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