Combined cone and ball integrated double seal stop valve

Abstract

This invention proposes a composite cone-ball integrated double-seal stop valve. The valve seat is a double-seal valve seat with a cone-shaped sealing surface and a ball-shaped sealing surface spaced apart from top to bottom. The valve core, used in conjunction with the double-seal valve seat, includes a cone-shaped valve core and a ball-shaped valve core. The cone-shaped valve core has a cone-shaped sealing surface that mates with the cone-shaped sealing surface of the valve seat. The outer surface of the ball-shaped valve core mates with the ball-shaped sealing surface. A portion of the ball-shaped valve core is disposed within a receiving through-hole of the cone-shaped valve core, preventing it from detaching from the cone-shaped valve core. The cone-shaped valve core is connected to the valve stem. A spring mechanism is also provided within the receiving through-hole, positioned between the lower end face of the ball-shaped valve core and the valve stem. When the valve stem moves downward, the outer surface of the ball-shaped valve core first contacts and seals with the ball-shaped sealing surface. As the valve stem continues to move downward, the cone-shaped sealing surface of the valve core contacts and seals with the cone-shaped sealing surface of the valve seat. This stop valve improves the problem of internal leakage and extends the service life of the stop valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a composite cone and ball integrated double-seal stop valve. Background Technology

[0002] The basic structure of a conventional gate valve consists of a single valve core and seat. The sealing surfaces of the valve core and seat are constructed using a hard alloy overlay, and the sealing surface types include flat seals, conical seals, and spherical seals. These valves are commonly used in drainage, steam, and oil pipelines in thermal power plants and petrochemical plants.

[0003] A valve is essentially a switch for a pipeline. When opened, it ensures the smooth flow of the medium within the pipeline, and when closed, it tightly blocks the flow of the medium. However, the medium in the pipeline will more or less contain system impurities, such as oxide scale that has detached from the inner wall of the condensate and vapor venting pipes, mechanical impurities or crystals from the sewage discharged after chemical treatment, and silt. These impurities can severely damage the valve sealing surface. During the valve closing process, if any impurities become stuck at the sealing surface between the valve core and the valve seat, the valve sealing surface will develop pits due to the pressure of the closing force, leading to internal leakage, or even directly causing the valve to fail to close completely.

[0004] Valves with a single valve core and seat will have a significantly shortened service life if they encounter the above-mentioned problems. If the valve seat is made of hard alloy welded onto the valve, the valve can only be removed from the pipeline system, repaired, or replaced before being reinstalled. Internal valve leakage and replacement not only waste system resources but also reduce system efficiency, directly impacting the company's energy conservation, emission reduction, and economic benefits. Utility Model Content

[0005] To address the problems existing in the prior art, this application proposes a composite cone and ball integrated double-seal stop valve.

[0006] To achieve the above objectives, this application proposes a composite cone-ball integrated double-seal stop valve, comprising a valve body and a valve cover. A valve seat and a valve cage are sequentially arranged from bottom to top within the water chamber of the valve body. The valve seat is a double-seal valve seat, and a conical sealing surface and a spherical sealing surface are spaced apart from top to bottom within the double-seal valve seat. The valve core, which cooperates with the double-seal valve seat, includes a conical valve core and a spherical valve core. The conical valve core has a conical sealing surface that cooperates with the conical sealing surface of the valve seat. The outer surface of the spherical valve core cooperates with the spherical sealing surface, and a portion of the spherical valve core is further configured... Within the accommodating through-hole of the conical valve core, the spherical valve core cannot detach from the conical valve core. The conical valve core is connected to the valve stem. A spring mechanism is also provided within the accommodating through-hole, positioned between the lower end faces of the spherical valve core and the valve stem. This spring mechanism prevents the spherical valve core from rotating freely within the conical valve core and prevents relative movement between the spherical valve core and the conical valve core when an external force is applied. When the valve stem moves downwards, the outer surface of the spherical valve core first achieves abutment and sealing with the spherical sealing surface. As the valve stem continues to move downwards, the conical sealing surface of the valve core abuts and seals with the conical sealing surface of the valve seat.

[0007] In some embodiments, the double-sealed valve seat is provided with a valve seat through hole, a first transition hole, a receiving groove and a second transition hole sequentially arranged from bottom to top along the axial direction. The second transition hole is frustoconical, and the inner wall surface of the second transition hole serves as a conical sealing surface of the valve seat. The smaller diameter end of the second transition hole is connected to the cylindrical receiving groove. The middle region of the receiving groove is connected to the larger diameter end of the first transition hole. The inner wall surface of the first transition hole serves as a spherical sealing surface. The smaller diameter end of the first transition hole is connected to the valve seat through hole. The valve seat through hole is a cylindrical through hole.

[0008] In some embodiments, a tapered sealing surface is formed circumferentially on the outer wall of the lower end of the tapered valve core. The tapered valve core has a connecting mounting through-hole and a receiving through-hole arranged sequentially from top to bottom along the axial direction. The diameter of the mounting through-hole is larger than the maximum diameter of the receiving through-hole. An internal thread is provided on the inner wall of the mounting through-hole. A boss is provided circumferentially on the outer wall of the lower end of the valve stem. An external thread is provided on the outer wall of the boss. The valve stem is assembled into the mounting through-hole of the tapered valve core via a threaded connection. The end of the valve stem is located within the receiving through-hole. The diameter of the lower end of the receiving through-hole decreases sequentially from top to bottom. The diameter of the lower end of the receiving through-hole is smaller than the diameter of the spherical valve core, so that the spherical valve core cannot detach from the tapered valve core.

[0009] In some embodiments, the elastic mechanism is a disc spring located between the lower end face of the valve stem and the spherical valve core.

[0010] The beneficial effects of this solution are as follows: the aforementioned composite cone and ball integrated double-seal stop valve, through the stepped two-stage sealing structure of the outer surface of the spherical valve core and the spherical sealing surface, and the conical sealing surface of the valve core and the conical sealing surface of the valve seat, can protect the upper conical sealing surface of the valve core and the conical sealing surface of the valve seat from damage by impurities and water flow impact as much as possible, effectively improving the problem of internal leakage of the stop valve; it can extend the service life of the stop valve; in addition, since the double-seal valve seat is independently set, when it is necessary to replace parts, it is not necessary to remove the stop valve from the pipeline as a whole, only the double-seal valve seat needs to be replaced. Attached Figure Description

[0011] Figure 1 A schematic diagram of the composite cone and ball integrated double-seal shut-off valve in the embodiment is shown.

[0012] Figure 2 A schematic diagram of the double-sealed valve seat in the embodiment is shown.

[0013] Figure 3 An assembly diagram of the valve stem, disc spring, conical valve core, and ball valve core in the embodiment is shown.

[0014] Figure 4 An assembly diagram of the conical valve core, ball valve core, and double-sealed valve seat in the embodiment is shown.

[0015] Reference numerals: 1-Valve body, 101-Water chamber, 102-Fluid inlet channel, 103-Fluid outlet channel, 2-Valve cover, 3-Double-seal valve seat, 301-Valve seat perforation, 302-Spherical sealing surface, 303-Accommodation groove, 304-Valve seat conical sealing surface, 4-Valve cage, 401-Valve cage perforation, 402-Fluid perforation, 5-Valve seat sealing structure, 6-Valve cage sealing structure, 7-Valve cover sealing structure, 8-Conical valve core, 801-Valve core conical sealing surface, 802-Assembly through hole, 803-Accommodation through hole, 9-Spherical valve core, 10-Disc spring, 11-Valve stem, 1101-Boss, 1102-Groove, 12-Sealing packing, 13-Sealing packing gland, 14-Drive mechanism. Detailed Implementation

[0016] The specific embodiments of this application will be further described below with reference to the accompanying drawings.

[0017] In the description of this application, it should be understood that the terms "first," "second," etc., are used to distinguish similar objects, rather than to describe or indicate a specific order or sequence. The terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0018] like Figures 1-4 As shown, the composite cone and ball integrated double-seal stop valve involved in this application includes a detachably connected valve body 1 and valve cover 2. Specifically, the two can be connected by bolts. The valve body 1 includes a water chamber 101, a fluid inlet channel 102, and a fluid outlet channel 103 that are connected. In the water chamber 101 of the valve body 1, a valve seat and a valve cage 4 are arranged sequentially from bottom to top. Specifically, the lower outer wall of the valve seat is engaged with the inner wall of the water chamber 101. The engagement point can be equipped with a valve seat sealing structure 5 to ensure sealing performance. The upper end of the valve seat is engaged with the valve cage 4. The upper end of the valve cage 4 is pressed and fixed by the valve cover 2. In order to ensure sealing performance, a valve cage sealing structure 6 is provided at the contact position between the valve cage 4 and the valve cover 2, and a valve cover sealing structure 7 is provided at the contact position between the valve cover 2 and the valve body 1. The above structure is similar to the relevant structure of the stop valve in the prior art and belongs to the prior art. Further structural description is not provided here.

[0019] The valve seat involved in this application is a double-sealed valve seat 3. The double-sealed valve seat 3 has a valve seat conical sealing surface 304 and a spherical sealing surface 302 spaced apart from top to bottom. Specifically, the double-sealed valve seat 3 has, along the axial direction from bottom to top, a valve seat through hole 301, a first transition hole, a receiving groove 303, and a second transition hole that are interconnected. The second transition hole is frustoconical, and the inner wall surface of the second transition hole serves as the valve seat conical sealing surface 304. The width of the valve seat conical sealing surface 304 shall not exceed 2 mm. The smaller diameter end of the second transition hole is connected to the cylindrical receiving groove 303. The middle region of the receiving groove 303 is connected to the larger diameter end of the first transition hole. The inner wall surface of the first transition hole serves as the spherical sealing surface 302. The smaller diameter end of the first transition hole is connected to the valve seat through hole 301, which is a cylindrical through hole.

[0020] The reason why the width of the valve seat conical sealing surface 304 is set not to exceed 2mm is as follows: Theoretically, the smaller the width of the valve seat conical sealing surface 304, the better the sealing performance, the lower the probability of slag inclusion at the sealing surface when the valve is closed, and the corresponding reduction in the valve closing force requirement, making the valve closing operation easier. However, valve design calculations include requirements for the width of the valve seat sealing surface. If the width of the sealing surface is determined according to the calculated value, it will be too wide in actual use. If the width of the sealing surface is too small, it will form a right-angled boss, which will significantly increase the shear force on the valve core sealing surface when the valve is closed. Therefore, setting the width of the valve seat conical sealing surface 304 to within 2mm is the most suitable size.

[0021] The valve core used in conjunction with the double-sealed valve seat 3 includes a conical valve core 8 and a spherical valve core 9. The conical valve core 8 is provided with a valve core conical sealing surface 801 that cooperates with the conical sealing surface 304 of the valve seat. The outer surface of the spherical valve core 9 cooperates with the spherical sealing surface 302, and a portion of the spherical valve core 9 is disposed within the accommodating through hole 803 of the conical valve core 8. The spherical valve core 9 cannot detach from the conical valve core 8. The conical valve core 8 is connected to the valve stem 11. A spring mechanism is also provided within the accommodating through hole 803. The spring mechanism is disposed between the lower end face of the spherical valve core 9 and the valve stem 11. Through the provision of the spring mechanism, pressure can be applied to the spherical valve core 9 to prevent the spherical valve core 9 from rotating freely within the conical valve core 8. When an external force is applied, the spherical valve core 9 and the conical valve core 8 can move relative to each other by compressing the spring mechanism. The valve stem 11 is controlled to move up and down. When the valve stem 11 moves down, the outer surface of the spherical valve core 9 first comes into contact with the spherical sealing surface 302 to achieve a seal. Then, the valve core conical sealing surface 801 comes into contact with the valve seat conical sealing surface 304 to achieve a seal.

[0022] Specifically, the lower end of the conical valve core 8 has a circumferentially formed conical sealing surface 801 on its outer wall. The conical valve core 8 has a connecting assembly through hole 802 and a receiving through hole 803 sequentially arranged from top to bottom along the axial direction. The diameter of the assembly through hole 802 is larger than the maximum diameter of the receiving through hole 803. The inner wall of the assembly through hole 802 has an internal thread. The lower end of the valve stem 11 has a circumferentially formed boss 1101 on its outer wall. The outer wall of the boss 1101 has an external thread. The valve stem 11 is assembled into the assembly through hole 802 of the conical valve core 8 via a threaded connection. The end is located within the accommodating through hole 803. The diameter of the lower end of the accommodating through hole 803 decreases from top to bottom. The diameter of the lower end of the accommodating through hole 803 is smaller than the diameter of the spherical valve core 9, so that the spherical valve core 9 cannot detach from the conical valve core 8. The elastic mechanism adopts a disc spring 10. The disc spring 10 is located between the lower end face of the valve stem 11 and the spherical valve core 9. A groove 1102 is provided at the lower end face of the valve stem 11. The upper end of the disc spring 10 is located within the groove 1102. This structural arrangement can prevent the lower end face of the valve stem 11 from directly pressing against the spherical valve core 9 when the disc spring 10 is under extreme compression. By setting the disc spring 10, pressure is applied to the spherical valve core 9, causing the spherical valve core 9 to contact the inner wall of the lower end of the accommodating through hole 803. This prevents the spherical valve core 9 from rotating freely within the conical valve core 8. When an external force is applied, the spherical valve core 9 and the conical valve core 8 can move relative to each other by compressing the disc spring 10.

[0023] The valve stem 11 is controllable and can move up and down. This movement can be achieved through a drive mechanism 14. Specifically, the drive mechanism 14 can be electric, manual, or pneumatic, all of which are existing technologies and will not be described further here. Figure 1 The image shows an electric drive mechanism.

[0024] A sealing packing 12 is provided between the valve stem perforation in the valve cover 2 and the valve stem 11. A sealing packing gland 13 is fixedly connected to the upper end of the valve cover 2 by bolts. The sealing packing 12 is used to prevent fluid from leaking out of the valve stem perforation. The sealing packing gland 13 is used to press the sealing packing 12 to ensure the sealing effect of the sealing packing 12.

[0025] In actual use, the fluid enters from the fluid inlet channel 102, rises along the outer wall of the double-sealed valve seat 3 and the outer wall of the valve cage 4 in the water chamber 101, then enters from the fluid perforation 402 of the valve cage 4, and then flows into the valve cage perforation 401 and the valve seat perforation 301 of the valve cage 4, and finally flows from the lower part of the water chamber 101 into the fluid outlet channel 103, and then is discharged.

[0026] When the shut-off valve needs to be closed, the valve stem 11 is controlled to gradually move downward. During the downward movement of the valve stem 11, the outer surface of the spherical valve core 9 first comes into contact with the spherical sealing surface 302 to form a seal. At this time, the conical sealing surface 801 of the valve core and the conical sealing surface 304 of the valve seat have not yet come into contact. Due to the sealing effect between the outer surface of the spherical valve core 9 and the spherical sealing surface 302, the fluid in the pipeline is in a static state, and the shut-off valve is already in a closed state. Therefore, impurities in the pipeline do not move and will not damage the conical sealing surface 801 of the valve core and the conical sealing surface 304 of the valve seat.

[0027] As the valve stem 11 continues to move downward, the disc spring 10 enables relative movement between the ball valve core 9 and the conical valve core 8. The conical valve core 8 continues to move downward until the conical sealing surface 801 of the valve core comes into contact with and seals the conical sealing surface 304 of the valve seat.

[0028] The process of opening the shut-off valve is as follows: The valve stem 11 is gradually moved upward. During the upward movement of the valve stem 11, the valve core conical sealing surface 801 and the valve seat conical sealing surface 304 separate first. During this process, due to the pressure of the disc spring 10, the outer surface of the spherical valve core 9 and the spherical sealing surface 302 are still in contact and sealing state, and there is no fluid flow in the pipeline. As the valve stem 11 continues to move upward, the separation distance between the valve core conical sealing surface 801 and the valve seat conical sealing surface 304 gradually increases, and the outer surface of the spherical valve core 9 and the spherical sealing surface 302 gradually separate. Since the distance between the valve core conical sealing surface 801 and the valve seat conical sealing surface 304 is already large, they will not be damaged by water flow impact, thus protecting the valve core conical sealing surface 801 and the valve seat conical sealing surface 304 as much as possible.

[0029] The composite cone-ball integrated double-seal stop valve involved in this application, through the setting of the outer surface of the spherical valve core and the spherical sealing surface, and the conical sealing surface of the valve core and the conical sealing surface of the valve seat, has a stepped two-stage sealing structure. This can protect the upper conical sealing surface of the valve core and the conical sealing surface of the valve seat from damage caused by impurities and water flow impact, effectively improving the problem of internal leakage of the stop valve; it can extend the service life of the stop valve; in addition, since the double-seal valve seat is set independently, when it is necessary to replace parts, it is not necessary to remove the stop valve from the pipeline as a whole, only the double-seal valve seat needs to be replaced.

[0030] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A composite cone and ball integrated double-seal stop valve, comprising a valve body and a valve cover, wherein a valve seat and a valve cage are sequentially arranged in the water chamber of the valve body from bottom to top, characterized in that: The valve seat is a double-sealed valve seat, in which conical sealing surfaces and spherical sealing surfaces are spaced apart from top to bottom. The valve core, which mates with the double-sealed valve seat, includes a conical valve core and a spherical valve core. The conical valve core has a conical sealing surface that mates with the conical sealing surface of the valve seat. The outer surface of the spherical valve core mates with the spherical sealing surface, and a portion of the spherical valve core is disposed within the accommodating through-hole of the conical valve core. The spherical valve core cannot detach from the conical valve core. The valve core is connected to the valve stem, and a spring mechanism is also provided in the accommodating through hole. The spring mechanism is located between the lower end face of the spherical valve core and the valve stem. The spring mechanism is used to prevent the spherical valve core from rotating freely in the conical valve core and to prevent relative movement between the spherical valve core and the conical valve core when an external force is applied. When the valve stem moves down, the outer surface of the spherical valve core first abuts and seals with the spherical sealing surface. As the valve stem continues to move down, the conical sealing surface of the valve core abuts and seals with the conical sealing surface of the valve seat.

2. The composite cone and ball integrated double-seal stop valve according to claim 1, characterized in that: The double-sealed valve seat has, along the axial direction from bottom to top, a connected valve seat through hole, a first transition hole, a receiving groove, and a second transition hole. The second transition hole is frustoconical, and the inner wall surface of the second transition hole serves as the conical sealing surface of the valve seat. The smaller diameter end of the second transition hole is connected to the cylindrical receiving groove. The middle area of ​​the receiving groove is connected to the larger diameter end of the first transition hole. The inner wall surface of the first transition hole serves as a spherical sealing surface. The smaller diameter end of the first transition hole is connected to the valve seat through hole, which is a cylindrical through hole.

3. The composite cone and ball integrated double-seal stop valve according to claim 1, characterized in that: The lower end of the conical valve core has a circumferentially formed conical sealing surface. The conical valve core has a connecting assembly through-hole and a receiving through-hole arranged sequentially from top to bottom along its axial direction. The diameter of the assembly through-hole is larger than the maximum diameter of the receiving through-hole. The inner wall of the assembly through-hole has an internal thread. The lower end of the valve stem has a circumferentially formed boss on its outer wall, and the outer wall of the boss has an external thread. The valve stem is assembled into the assembly through-hole of the conical valve core via a threaded connection. The end of the valve stem is located within the receiving through-hole. The diameter of the lower end of the receiving through-hole decreases sequentially from top to bottom. The diameter of the lower end of the receiving through-hole is smaller than the diameter of the spherical valve core, ensuring that the spherical valve core cannot detach from the conical valve core.

4. The composite cone and ball integrated double-seal stop valve according to claim 3, characterized in that: The elastic mechanism uses a disc spring, which is located between the lower end face of the valve stem and the spherical valve core.

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