Automatically adjustable sealing center tie rod

Abstract

This application relates to an automatically adjustable sealing center tie rod, belonging to the field of center tie rod technology. It includes a pump body, a fixed platform fixedly mounted on the outside of the pump body, a center tie rod body installed inside the fixed platform, a fixed cylinder on the outside of the fixed platform, and four brackets fixedly connected to one side of the fixed cylinder. The beneficial effect of this application is that, through the rotation of the bidirectional lead screw, two transmission plates can be synchronously driven to slide along the inner wall of the fixed frame, thereby causing the electromagnetic rod to move closer to or away from the center tie rod body. Combined with the attraction of the electromagnetic rod to the magnetic block, the position of the two semi-elastic sealing rings is adjusted, ultimately achieving precise control of the contact stress. Furthermore, the entire adjustment structure only requires one drive motor and two electromagnetic rods to replace the function of the original four cylinders, not only reducing the number of core drive components and lowering the overall manufacturing cost of the equipment, but also simplifying the transmission structure, eliminating the need to deal with the complex chain of multi-cylinder coordination during later troubleshooting.

Description

Technical Field

[0001] This application relates to the field of center tie rod technology, and more particularly to a center tie rod with an automatically adjustable seal. Background Technology

[0002] As a crucial piece of equipment in drilling operations, the drilling pump delivers circulating high-pressure drilling fluid to the bottom of the well during operation. This fluid flushes the wellbore, breaks up rocks, cools and lubricates the drill bit, and carries cuttings back to the surface. Currently, the main type of drilling pump used in drilling equipment is the reciprocating piston pump. Its structure consists of two parts: a power end and a hydraulic end. The power end mainly includes the frame assembly, crankshaft assembly, pinion gear assembly, and crosshead assembly, etc., which transmits power to the hydraulic end through a transmission gear and crank connecting mechanism. The hydraulic end mainly includes the cylinder, pump head, and center tie rod, etc., which discharges drilling fluid at a certain pressure and flow rate through the reciprocating motion of the piston. The center tie rod is the connecting hub between the power end and the hydraulic end of the drilling pump. The connection between the center tie rod and the power end is lubricated by oil from a gear pump within the power end; the connection between the center tie rod and the hydraulic end is lubricated and cooled by a spray pump on the hydraulic end.

[0003] A search revealed a Chinese patent (authorization announcement number CN203906255U) disclosing an automatically adjustable sealing center tie rod. This patent includes a fixed cylinder with a movable cavity inside. A protrusion is located in the center of the elastic sealing ring. A roller passes through a sleeve and contacts the protrusion, compressing the elastic sealing ring until it contacts the center tie rod. It also includes a pressure sensor mounted on the bottom of the roller and in contact with the protrusion. The pressure sensor is connected to a cylinder drive device via a wire. While this patented technology achieves adjustable sealing of the center tie rod and extends the service life of the sealing ring, it also addresses the issue of radial runout during the center tie rod's movement. The protrusion, made of the same material as the elastic sealing ring, eliminates stress caused by this radial runout, ensuring stable movement of the center tie rod.

[0004] However, the above-mentioned device still has some drawbacks in actual use. The most obvious one is that in order to adjust the contact stress between the elastic sealing ring and the central tie rod, four cylinders need to be installed around the central tie rod. This not only increases the manufacturing cost and structural complexity of the equipment, but also increases the difficulty of troubleshooting later. At the same time, the current design of the sealing ring installation method around the central tie rod is unreasonable, which makes the replacement of the sealing ring and daily maintenance operations cumbersome and consumes a lot of time, seriously affecting the continuity of drilling operations and making it difficult to meet the actual needs of efficient drilling. Utility Model Content

[0005] In view of the above-mentioned problems existing in the prior art, the main objective of this application is to provide a center tie rod that can automatically adjust the seal.

[0006] The technical solution of this application is as follows: an automatically adjustable sealing center pull rod includes a pump body, a fixed platform is fixedly installed on the outside of the pump body, the center pull rod body is installed inside the fixed platform, a fixed cylinder is provided on the outside of the fixed platform, four brackets are fixedly connected to one side of the fixed cylinder, a fixed frame is fixedly connected between the four brackets, a bidirectional lead screw is rotatably connected inside the fixed frame, transmission plates are threaded to both ends of the outer side of the bidirectional lead screw, the transmission plates are slidably connected to the inner wall of the fixed frame, an electromagnetic rod is fixedly connected to the side of the two transmission plates that are close to each other, a magnetic block is attracted to the end of the electromagnetic rod away from the transmission plate, two semi-elastic sealing rings are provided inside the fixed cylinder, and the magnetic block is fixedly connected to the corresponding semi-elastic sealing ring.

[0007] In a preferred embodiment, two limiting screws are slidably connected to both ends of the fixed cylinder, and the semi-elastic sealing ring has a threaded hole inside that cooperates with the limiting screws. The threaded hole is threadedly connected to the corresponding limiting screw.

[0008] In a preferred embodiment, the outer side of the fixed cylinder is provided with a disassembly assembly, which includes a plurality of mounting plates fixedly connected to the outer periphery of the fixed cylinder, and the plurality of mounting plates are arranged at equal intervals.

[0009] In a preferred embodiment, the disassembly assembly further includes a locking bolt threaded inside the mounting plate, and the mounting plate is connected to the fixing platform via the locking bolt.

[0010] In a preferred embodiment, a drive motor is fixedly installed on the top of the fixed frame, and a controller is provided on the outside of the fixed cylinder.

[0011] In a preferred embodiment, the output shaft of the drive motor extends into the interior of the fixed frame and is fixedly connected to the bidirectional lead screw.

[0012] In a preferred embodiment, the interior of the fixed cylinder is provided with a slot for use with the electromagnetic rod, and the electromagnetic rod is slidably connected to the interior of the fixed cylinder.

[0013] In a preferred embodiment, both the drive motor and the solenoid are electrically connected to the controller.

[0014] Compared with the prior art, the advantages and positive effects of this application are as follows:

[0015] 1. In this application, the rotation of the bidirectional lead screw can synchronously drive the two transmission plates to slide along the inner wall of the fixed frame, thereby driving the electromagnetic rod to move closer to or away from the central pull rod body. Combined with the attraction of the electromagnetic rod to the magnetic block, the position of the two semi-elastic sealing rings can be adjusted, and the contact stress can be precisely controlled. Moreover, the entire adjustment structure only requires one drive motor and two electromagnetic rods to replace the function of the original four cylinders. This not only reduces the number of core drive components and lowers the overall manufacturing cost of the equipment, but also simplifies the transmission structure, so that troubleshooting in the later stage does not have to deal with the complex link of multi-cylinder coordination.

[0016] 2. In this application, when it is necessary to replace or maintain the semi-elastic sealing ring, it is only necessary to unscrew the locking bolt to remove the fixing cylinder, and then unscrew the limit screw to separate the semi-elastic sealing ring. The whole process does not require disassembling the central tie rod body or other core components. The operation steps are simple, which greatly shortens the maintenance time, effectively ensures the continuity of drilling operations, and meets the actual needs of efficient drilling. Attached Figure Description

[0017] Figure 1 Provided for this application an overall perspective view of the center tie rod capable of automatically adjusting the seal;

[0018] Figure 2 A partial schematic diagram of the central tie rod for automatically adjustable sealing is provided for this application;

[0019] Figure 3 A half-sectional view of the fixed cylinder of the center tie rod with automatic adjustable sealing is provided for this application;

[0020] Figure 4 The central tie rod for automatically adjusting the seal is provided for this application. Figure 1 Enlarged view of point A in the middle.

[0021] Legend: 1. Pump body; 2. Fixed cylinder; 3. Main body of central tie rod; 4. Fixed frame; 5. Drive motor; 6. Transmission plate; 7. Electromagnetic rod; 8. Mounting plate; 9. Locking bolt; 10. Limiting screw; 11. Semi-elastic sealing ring; 12. Threaded hole; 13. Magnetic block; 14. Bidirectional lead screw; 15. Bracket; 16. Fixed platform. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] Reference Figure 1-4The pump body 1 includes an automatically adjustable sealing center tie rod. A fixed platform 16 is fixedly installed on the outside of the pump body 1. The center tie rod body 3 is installed inside the fixed platform 16. A fixed cylinder 2 is provided on the outside of the fixed platform 16. Four brackets 15 are fixedly connected to one side of the fixed cylinder 2. A fixed frame 4 is fixedly connected between the four brackets 15. A bidirectional lead screw 14 is rotatably connected inside the fixed frame 4. Both ends of the bidirectional lead screw 14 are threadedly connected to transmission plates 6. The transmission plates 6 are slidably connected to the inner wall of the fixed frame 4. Electromagnetic rods 7 are fixedly connected to the sides of the two transmission plates 6 that are close to each other. The ends of the electromagnetic rods 7 that are away from the transmission plates 6 attract magnetic blocks 13. The fixed cylinder 2 has two semi-elastic sealing rings inside. The sealing ring 11 and the magnetic block 13 are fixedly connected to the corresponding semi-elastic sealing ring 11. By rotating the bidirectional screw 14, the two transmission plates 6 can be driven to slide along the inner wall of the fixed frame 4, thereby driving the electromagnetic rod 7 to move closer to or away from the central pull rod body 3. Combined with the attraction of the electromagnetic rod 7 to the magnetic block 13, the position of the two semi-elastic sealing rings 11 can be adjusted, and the contact stress can be precisely controlled. Moreover, the entire adjustment structure only requires one drive motor 5 and two electromagnetic rods 7 to replace the function of the original four cylinders. This not only reduces the number of core drive components and lowers the overall manufacturing cost of the equipment, but also simplifies the transmission structure, so that subsequent troubleshooting does not have to deal with the complex link of multi-cylinder coordination.

[0024] Specifically, two limiting screws 10 are slidably connected to both ends inside the fixed cylinder 2. The semi-elastic sealing ring 11 has a threaded hole 12 that cooperates with the limiting screws 10. By screwing in the limiting screws 10, the movement of the semi-elastic sealing ring 11 is effectively limited, making the semi-elastic sealing ring 11 more stable during adjustment. The threaded hole 12 is threadedly connected to the corresponding limiting screw 10. A disassembly assembly is provided on the outside of the fixed cylinder 2. The disassembly assembly includes several mounting plates 8 fixedly connected to the outer periphery of the fixed cylinder 2. The mounting plates 8 are arranged at equal intervals. The disassembly assembly also includes locking bolts 9 threaded inside the mounting plates 8. When it is necessary to replace or maintain the semi-elastic sealing ring 11, simply unscrew the locking bolts 9 to remove the fixing cylinder 2, and then unscrew the limit screw 10 to separate the semi-elastic sealing ring 11. The whole process does not require disassembling the central tie rod body 3 or other core components. The operation steps are simple, which greatly shortens the maintenance time, effectively ensures the continuity of drilling operations, and meets the actual needs of efficient drilling. The mounting plates 8 and the fixing platform 16 are connected by locking bolts 9.

[0025] Specifically, a drive motor 5 is fixedly installed on the top of the fixed frame 4, and a controller is provided on the outside of the fixed cylinder 2. By rotating the output shaft of the drive motor 5, the bidirectional lead screw 14 can be driven to rotate, thereby realizing the transmission of power. The output shaft of the drive motor 5 extends into the interior of the fixed frame 4 and is fixedly connected to the bidirectional lead screw 14. The interior of the fixed cylinder 2 is provided with a slot for use with the electromagnetic rod 7. The electromagnetic rod 7 is slidably connected to the interior of the fixed cylinder 2. The controller can control the start and stop of the drive motor 5 and the electromagnetic rod 7. Both the drive motor 5 and the electromagnetic rod 7 are electrically connected to the controller.

[0026] Working principle: First, the operator can start the drive motor 5 through the controller. The rotation of the output shaft of the drive motor 5 drives the bidirectional lead screw 14 to rotate, which can simultaneously drive the two transmission plates 6 to slide along the inner wall of the fixed frame 4. This, in turn, drives the electromagnetic rod 7 to move closer to or away from the central tie rod body 3. Combined with the attraction of the electromagnetic rod 7 to the magnetic block 13, the position of the two semi-elastic sealing rings 11 is adjusted, and the contact stress is precisely controlled. The entire adjustment structure only requires one drive motor 5 and two electromagnetic rods 7 to replace the function of the original four cylinders. This not only reduces the number of core drive components but also lowers the overall manufacturing cost of the equipment. When it is necessary to replace or maintain the semi-elastic sealing rings 11, it is only necessary to unscrew the locking bolt 9 to remove the fixed cylinder 2 and then unscrew the limit screw 10 to separate the semi-elastic sealing rings 11. The whole process does not require disassembling the central tie rod body 3 or other core components. The operation steps are simple, which greatly shortens the maintenance time and effectively ensures the continuity of drilling operations.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A center pull rod with self-adjustable seal comprising a pump body (1) characterized in that: A fixed platform (16) is fixedly installed on the outside of the pump body (1). A central tie rod body (3) is installed inside the fixed platform (16). A fixed cylinder (2) is provided on the outside of the fixed platform (16). Four brackets (15) are fixedly connected to one side of the fixed cylinder (2). A fixed frame (4) is fixedly connected between the four brackets (15). A bidirectional screw (14) is rotatably connected inside the fixed frame (4). Both ends of the bidirectional screw (14) are threadedly connected to transmission plates (6). The transmission plates (6) are slidably connected to the inner wall of the fixed frame (4). Electromagnetic rods (7) are fixedly connected to the side of the two transmission plates (6) that are close to each other. A magnetic block (13) is attracted to the end of the electromagnetic rod (7) that is away from the transmission plate (6). Two semi-elastic sealing rings (11) are provided inside the fixed cylinder (2). The magnetic block (13) is fixedly connected to the corresponding semi-elastic sealing ring (11).

2. The self-adjusting sealable center pull rod of claim 1, wherein: The fixed cylinder (2) has two limiting screws (10) slidably connected to both ends. The semi-elastic sealing ring (11) has a threaded hole (12) that cooperates with the limiting screw (10). The threaded hole (12) is threadedly connected to the corresponding limiting screw (10).

3. The self-adjusting sealable center pull rod of claim 1, wherein: The outer side of the fixed cylinder (2) is provided with a disassembly assembly, which includes a plurality of mounting plates (8) fixedly connected to the outer periphery of the fixed cylinder (2), and the plurality of mounting plates (8) are arranged at equal intervals.

4. The self-adjusting sealable center pull rod of claim 3, wherein: The disassembly assembly also includes a locking bolt (9) threaded inside the mounting plate (8), which is connected to the fixing platform (16) via the locking bolt (9).

5. The self-adjusting sealable center pull rod of claim 1, wherein: A drive motor (5) is fixedly installed on the top of the fixed frame (4), and a controller is provided on the outside of the fixed cylinder (2).

6. The self-adjusting sealable center pull rod of claim 5, wherein: The output shaft of the drive motor (5) extends into the interior of the fixed frame (4) and is fixedly connected to the bidirectional lead screw (14).

7. The automatically adjustable sealing center tie rod according to claim 1, characterized in that: The fixed cylinder (2) has a slot inside that works with the electromagnetic rod (7), and the electromagnetic rod (7) is slidably connected to the inside of the fixed cylinder (2).

8. The self-adjusting sealable center pull rod of claim 5, wherein: The drive motor (5) and the electromagnetic rod (7) are both electrically connected to the controller.

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