A two-way cylindrical spring plug valve

Abstract

The present invention discloses a bidirectional cylindrical spring plug valve, comprising a valve body (10); a ball core (20) is arranged in the valve body (10); one side of the ball core (20) is connected to an operating key (30); a ball seat assembly (40) is respectively arranged at the upper and lower ends of the ball core (20); a pressure plate (50), a splicing ring (60), a support ring (70) and a hole elastic retaining ring (80) are arranged on the top of the ball seat assembly (40) at the upper end of the ball core (20) in order from bottom to top. The present invention minimizes the number of parts and the consumption of parts materials, minimizes the processing difficulty while improving the strength and safety of the tool, can save assembly and disassembly time, realizes pressure opening and pressure closing under a certain pressure, and can not only improve the reliability and safety of the plug valve, but also effectively improve the cost performance of the product. The bidirectional cylindrical spring plug valve of the present invention is suitable for high-pressure plug valves with double operating keys and drill pipe plug valves, top drive plug valves, drill pipe safety valves or oil pipe plug valves.

Description

Technical Field

[0001] The invention relates to a bidirectional cylindrical spring plug valve, belonging to the technical field of oil field equipment. Background Art

[0002] As a kind of anti-blowout ball valve in drilling tools, plug valve has been widely used in drilling and well repairing operations at home and abroad to isolate or connect the liquid in the water hole of the drill string. In the normal drilling process, the plug valve is opened to allow the drilling fluid to enter the drill string. When connecting a single root, the plug valve is closed to prevent the drilling fluid from splashing on the well platform, which not only avoids the waste of drilling fluid, but also meets the environmental protection requirements; when accidents such as well kick and blowout occur underground, timely closing the plug valve can prevent the flammable gas or liquid from overflowing from the wellhead, causing casualties and property losses.

[0003] The plug valves commonly used in the market are complex in structure, difficult to assemble, unstable in pressure testing, difficult to pass the pressure test, and difficult to mass produce. In addition, there are deep annular grooves cut on the inner hole of the body, which have low strength and cause stress concentration, which is easy to break and bring new safety hazards. The existing plug valves have many parts, the upper and lower ball seats or valve seats are not universal, the body strength is low, it is not easy to process and manage, it is inconvenient to disassemble and assemble, it is time-consuming and labor-intensive, and the pressure is unstable after assembly. Therefore, the existing technology still has shortcomings and needs further improvement. Summary of the invention

[0004] The object of the present invention is to provide a bidirectional cylindrical spring plug valve to minimize the number of parts and the consumption of parts materials, minimize the processing difficulty while improving the strength and safety of the tool, save assembly and disassembly time, and achieve pressure opening and pressure closing under a certain pressure, thereby improving the reliability and safety of the plug valve, and effectively improving the cost performance of the product and overcoming the shortcomings of the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A bidirectional cylindrical spring plug valve of the present invention comprises a valve body; a ball core is arranged in the valve body; one side of the ball core is connected to an operating key, and ball seat assemblies are arranged at the upper and lower ends of the ball core respectively, and a pressure plate, a splicing ring, a support ring and an elastic retaining ring for a hole are arranged on the top of the ball seat assembly at the upper end of the ball core in sequence from bottom to top.

[0007] In the aforementioned bidirectional cylindrical spring plug valve, the valve body is a tubular structure; the inner hole of the valve body is a smooth through hole, an inner step is provided in the smooth through hole, a ball seat assembly is installed on the inner step, and a key hole is provided on the side of the valve body corresponding to the ball core; a pair of fan-shaped grooves and a pair of fan-shaped keys are provided on the inner side of the key hole; a sealing groove for installing a sealing ring is provided on the side wall of the key hole; a splicing ring groove for installing a splicing ring is provided on the upper part of the inner hole of the valve body.

[0008] In the aforementioned bidirectional cylindrical spring plug valve, the ball core is a spherical structure; a through hole is provided on the ball core; an operating platform parallel to the through hole is provided on one side of the ball core, a key slot is provided on the operating platform, and a small hole communicating with the through hole is provided in the center of the key slot.

[0009] In the aforementioned bidirectional cylindrical spring plug valve, the operating key is a variable diameter cylinder; a screw key is provided on the large diameter bottom surface of the operating key, and the screw key is connected with the keyway; a pair of limit keys are provided on the large diameter top surface of the operating key on the ball core, and the limit keys are located in a pair of fan-shaped grooves of the key hole on the valve body; a screw hole is provided at the center of the small diameter of the operating key, and the screw hole is a square hole or a hexagonal hole; a threaded hole is provided at the bottom of the screw hole; an indicator groove is provided on the small diameter end surface of the operating key for indicating the switch status.

[0010] In the aforementioned two-way cylindrical spring plug valve, the ball seat assembly includes an upper ball seat assembly and a lower ball seat assembly; the upper ball seat assembly and the lower ball seat assembly have the same structure; the ball seat assembly is composed of a ball seat and a group of springs; the ball seat is in the shape of a circular tube; the opening at the end of the ball seat in contact with the ball core is an inner spherical surface; a group of spring holes evenly distributed along the circumference are provided at the other end of the ball seat, and a spring is provided in each spring hole; the spring in the upper ball seat assembly presses on the pressure plate, and the spring in the lower ball seat assembly presses on the inner step of the valve body.

[0011] In the aforementioned bidirectional cylindrical spring plug valve, the splicing ring is provided with an L-notch for installing a support ring; the splicing ring is a circular ring structure composed of four fan-shaped blocks, so as to be easily installed in the splicing ring groove of the inner hole of the valve body; a retaining ring groove is provided on the side of the L-notch, and an elastic retaining ring for the hole is provided in the retaining ring groove; the elastic retaining ring for the hole serves to limit the withdrawal of parts in the valve body hole.

[0012] Due to the adoption of the above technical scheme, the present invention adopts a bidirectional cylindrical spring structure, so that the center of the ball core automatically aligns with the axis of the operating key, which is beneficial to the high-pressure and low-pressure sealing at the upper and lower ends of the plug valve during the sealing pressure test, improves the qualified rate of pressure testing, and can realize the pressure opening and pressure closing under a certain pressure. It is particularly suitable for occasions where the combined height of the ball core and the ball seat becomes shorter after wear after use, and at the same time increases the number of reuses of the ball core assembly. The upper and lower ball seat assembly structures are unified, the ball seat assembly is standardized, and the upper and lower ball seat assemblies can be used interchangeably, which is beneficial to production management and the reuse of maintenance parts; the outer circle of the ball seat in the ball seat assembly is a cylinder to reduce the processing difficulty. The spring adopts a standard spring, and the number of standard springs can be adjusted according to the required force value to meet the force value requirements. A double fan-shaped structure is adopted between the operating key and the key hole, which realizes the 90° rotation limit of the switch, and the sealing groove is designed in the key hole. The structure is simple, the installation and disassembly are convenient, the key hole diameter is small, and the strength of the valve body is improved; the upper end surface of the upper ball seat assembly is provided with a pressure plate, which not only makes the force on the ball seat uniform, but also facilitates the installation of the splicing ring. The bidirectional cylindrical spring plug valve of the invention is suitable for high-pressure plug valves with double operating keys and drill pipe plug valves, top drive plug valves, drill pipe safety valves or oil pipe plug valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention;

[0014] Figure 2 It is an axonometric sectional view of the present invention.

[0015] The marks in the accompanying drawings are: 10-valve body, 11-smooth through hole, 12-inner step, 13-key hole, 14-sector groove, 15-sector key, 16-sealing groove, 17-segment ring groove, 20-ball core, 21-through hole, 22-operating platform, 23-key slot, 24-small hole, 30-operating key, 31-screw key, 32-limit key, 33-screw hole, 34-threaded hole, 35-indicator groove, 40-ball seat assembly, 41-ball seat, 42-spring, 43-inner spherical surface, 44-spring hole, 50-pressure plate, 60-segment ring, 61-, 62-sector block, 63-retaining ring groove, 70-support ring, 80-elastic retaining ring for hole. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] A bidirectional cylindrical spring plug valve according to the present invention, Figure 1 As shown, the main structure includes a valve body 10; a ball core 20 is arranged in the valve body 10; one side of the ball core 20 is connected to the operating key 30, and ball seat assemblies 40 are respectively arranged at the upper and lower ends of the ball core 20, and the top of the ball seat assembly 40 at the upper end of the ball core 20 is provided with a pressure plate 50, a splicing ring 60, a support ring 70 and an elastic retaining ring 80 for the hole in sequence from bottom to top.

[0018] Specific structure such as Figure 2As shown, the valve body 10 is a circular tubular structure; the inner hole of the valve body 10 is a smooth through hole 11, and an inner step 12 is provided in the smooth through hole 11, and a ball seat assembly 40 is installed at the inner step 12. A key hole 13 is provided on the side of the valve body 10 corresponding to the ball core 20; a pair of fan-shaped grooves 14 and a pair of fan-shaped keys 15 are provided on the inner side of the key hole 13; a sealing groove 16 for installing a sealing ring is provided on the side wall of the key hole 13; a splicing ring groove 17 for installing a splicing ring 60 is provided on the upper part of the inner hole of the valve body 10. The ball core 20 is a spherical structure; a through hole 21 is provided on the ball core 20; an operating platform 22 parallel to the through hole 21 is provided on one side of the ball core 20, and a key slot 23 is provided on the operating platform 22, and a small hole 24 communicating with the through hole 21 is provided in the center of the key slot 23. The operating key 30 is a variable diameter cylinder; a screw key 31 is provided on the large diameter bottom surface of the operating key 30, and the screw key 31 is connected with the key slot 23; a pair of limit keys 32 are provided on the large diameter top surface of the operating key 30 on the ball core 20, and the limit keys 32 are located in a pair of fan-shaped grooves 14 of the key hole 13 on the valve body 10; a screw hole 33 is provided at the small diameter center of the operating key 30, and the screw hole 33 is a square hole or a hexagonal hole; a threaded hole 34 is provided at the bottom of the screw hole 33; an indicating groove 35 for indicating the switch state is provided on the small diameter end surface of the operating key 30. The ball seat assembly 40 includes an upper ball seat assembly and a lower ball seat assembly; the upper ball seat assembly and the lower ball seat assembly have the same structure; the ball seat assembly 40 is composed of a ball seat 41 and a group of springs 42; the ball seat 41 is in the shape of a circular tube; the hole of the ball seat 41 at one end in contact with the ball core 20 is an inner spherical surface 43; the other end of the ball seat 41 is provided with a group of spring holes 44 evenly distributed along the circumference, and each spring hole 44 is provided with a spring 42; the spring 42 in the upper ball seat assembly is pressed against the pressure plate 50, and the spring 42 in the lower ball seat assembly is pressed against the inner step 12 of the valve body 10. The splicing ring 60 is provided with an L-notch 61 for installing the support ring 70; the splicing ring 60 is a circular ring structure composed of four fan-shaped blocks 62, so as to be conveniently installed in the splicing ring groove 17 of the inner hole of the valve body 10; a retaining ring groove 63 is provided on the side of the L-notch 61, and a hole elastic retaining ring 80 is provided in the retaining ring groove 63; the hole elastic retaining ring 80 plays the role of limiting the withdrawal of the parts in the hole of the valve body 10.

[0019] The supplementary description of the present invention is as follows:

[0020] The inner step 12 of the valve body 10 of the present invention is provided with a lower ball seat assembly, a ball core 20, an upper ball seat assembly, and a pressure plate 50 in sequence from bottom to top; the inner hole of the valve body 10 above the pressure plate 50 is provided with a splicing ring groove 17, and a splicing ring 60, a supporting ring 70 and a hole elastic retaining ring 80 are installed in the splicing ring groove 17; the hole elastic retaining ring 80 is used to limit all parts in the inner hole of the valve body 10 from withdrawing; a key hole 13 is provided on one side of the valve body 10, and the key hole 13 is a sealing hole with a step, and a pair of fan-shaped grooves 14 are provided on the end face of the step, and the fan-shaped grooves 14 cooperate with a pair of limit keys 32 on the operating key 30, so that the operating key 30 can only rotate within a range of 90°, and is used to drive the ball core 20 to rotate within a range of 90°, so as to realize the function of opening or closing the bidirectional cylindrical spring plug valve. Sealing grooves 16 are respectively provided in the holes of the valve body 10 and the upper and lower ball seat assemblies 40 and in the key hole 13 that cooperates with the valve body 10 and the operating key 30. Sealing rings are installed in the sealing grooves 16 to achieve sealing of the plug valve.

[0021] One end of the operating key 30 is a small diameter section, and the other end is a large diameter section; to prevent the operating key 30 from being pushed out when the water hole is under pressure. A screw hole 33 is provided in the center of the small diameter section of the operating key 30. The screw hole 33 adopts an inner hexagonal or inner square hole for installing a wrench. A pair of limit keys 32 are provided on the step end surface where the large diameter section and the small diameter section of the operating key 30 are connected. The limit keys 32 cooperate with the fan-shaped groove 14 in the key hole 13 on the valve body 10, so that the limit key 32 on the operating key 30 can only slide and rotate 90° in the key hole 13, realizing the 90° rotation switch of the ball valve. A screw key 31 is provided on the end surface of the large diameter section of the operating key 30. The screw key 31 cooperates with the key slot 23 on the ball core 20. The screw key 31 and the key slot 23 are both in the shape of a straight line. The screw key 31 is embedded in the key slot 23 in the center of the ball core 20, realizing the rotation linkage between the operating key 30 and the ball core 20.

[0022] The ball seat assembly 40 includes a ball seat 41 and a spring 42. The ball seat 41 is a circular ring structure, and the inner hole is provided with an annular groove. One end of the ball seat 41 is provided with a group of spring holes 44 evenly distributed along the circumference. The spring holes 44 are optical blind holes, and springs 42 are installed in the spring holes 44. The springs 42 are cylindrical springs. The hole opening at the other end of the ball seat 41 is sealed with the outer spherical surface of the ball core 20; the mating surface between the ball seat 41 and the ball core 20 is the inner spherical surface 43. There are two sets of ball seat assemblies 40, and the two sets of structures are exactly the same and can be used interchangeably. During installation, the two sets of ball seat assemblies 40 are respectively installed at the upper and lower ends of the ball core 20, the inner spherical surface 43 of the ball seat 41 is in contact with the ball core 20, and the spring 42 is located on the side away from the ball core 20. The lower spring 42 presses against the top surface of the inner step 12 of the valve body 10, and the upper spring 42 presses against the bottom surface of the pressure plate 50, so that the inner sphere 43 of the upper and lower ball seats 41 is in close contact with the outer sphere of the ball core 20, forming a bidirectional cylindrical spring structure to improve the sealing effect of the plug valve. The pressure plate 50 is a circular ring structure, which is installed above the upper ball seat and presses the spring 42 in the upper ball seat.

[0023] The bidirectional cylindrical spring plug valve of the invention is suitable for high-pressure plug valves with double operating keys and drill pipe plug valves, top drive plug valves, drill pipe safety valves or oil pipe plug valves.

Claims

1. A bidirectional cylindrical spring plug valve, comprising a valve body (10); characterized in that: A ball core (20) is provided in the valve body (10); one side of the ball core (20) is connected to the operating key (30); the upper and lower ends of the ball core (20) are provided with ball seat assemblies (40) respectively; the top of the ball seat assembly (40) at the upper end of the ball core (20) is provided with a pressure plate (50), a splicing ring (60), a support ring (70) and a hole elastic retaining ring (80) in order from bottom to top; the valve body (10) is a circular tubular structure; the inner hole of the valve body (10) is a smooth through hole (11); an inner step (12) is provided in the smooth through hole (11); the ball seat assembly (40) is installed at the inner step (12); the valve body (10) and the ball core (20) are connected to each other at one side thereof; A key hole (13) is provided on one side of the ball core (20); a pair of fan-shaped grooves (14) and a pair of fan-shaped keys (15) are provided on the inner side of the key hole (13); a sealing groove (16) for installing a sealing ring is provided on the side wall of the key hole (13); a splicing ring groove (17) for installing a splicing ring (60) is provided on the upper part of the inner hole of the valve body (10); the ball core (20) is a spherical structure; a through hole (21) is provided on the ball core (20); an operating platform (22) parallel to the through hole (21) is provided on one side of the ball core (20), a key groove (23) is provided on the operating platform (22), and a small hole (24) communicating with the through hole (21) is provided in the center of the key groove (23); the operating The key (30) is a variable diameter cylinder; a screw key (31) is provided on the large diameter bottom surface of the operating key (30), and the screw key (31) is matched and connected with the key slot (23); a pair of limit keys (32) are provided on the large diameter top surface of the operating key (30) on the ball core (20), and the limit keys (32) are located in a pair of fan-shaped grooves (14) of the key hole (13) on the valve body (10); a screw hole (33) is provided at the center of the small diameter of the operating key (30), and the screw hole (33) is a square hole or a hexagonal hole; a threaded hole (34) is provided at the bottom of the screw hole (33); and an indication groove (35) for indicating the switch state is provided on the small diameter end surface of the operating key (30). The ball seat assembly (40) comprises an upper ball seat assembly and a lower ball seat assembly; the upper ball seat assembly and the lower ball seat assembly have the same structure; the ball seat assembly (40) consists of a ball seat (41) and a group of springs (42); the ball seat (41) is in the shape of a circular tube; the opening of the ball seat (41) at one end in contact with the ball core (20) is an inner spherical surface (43); the other end of the ball seat (41) is provided with a group of spring holes (44) evenly distributed along the circumference, and each spring hole (44) is provided with a spring (42); the spring (42) in the upper ball seat assembly is pressed against the pressure plate (50), and the spring (42) in the lower ball seat assembly is pressed against the inner step (12) of the valve body (10).

2. The bidirectional cylindrical spring plug valve according to claim 1, characterized in that: The splicing ring (60) is provided with an L-shaped notch (61) for installing the support ring (70); the splicing ring (60) is a circular ring structure composed of four sector-shaped blocks (62) so as to be conveniently installed in the splicing ring groove (17) of the inner hole of the valve body (10); a retaining ring groove (63) is provided on the side of the L-shaped notch (61), and a hole elastic retaining ring (80) is provided in the retaining ring groove (63); the hole elastic retaining ring (80) serves to limit the withdrawal of parts in the hole of the valve body (10).

Images