A plug valve for oil drilling

Abstract

The application discloses a petroleum drilling plug valve and relates to the technical field of plug valves. The petroleum drilling plug valve comprises a valve body and a valve core mechanism, the valve core mechanism comprises a valve rod and a semicircular spherical top cap, a conical plugging block is rotatably installed at the bottom end of the valve rod, a wedge-shaped block is fixedly connected to the conical surface of the conical plugging block, a clamping groove is formed in the bottom of the surface of the wedge-shaped block, a self-locking assembly is installed in the valve rod, the self-locking assembly comprises a driving handle and a connecting guide rod, the end of the driving handle is hinged to the side of the inner cavity of the semicircular spherical top cap, a return spring is fixedly connected between the outer cylindrical surface of the connecting guide rod and the bottom of the inner cavity of the valve rod, a square locking block is fixedly connected to the bottom end of the connecting guide rod, a rotating end of the surface of the driving handle is fixedly connected with a pressing tooth, the plug valve has the advantages of preventing loosening, self-locking, reducing the influence of fluid impact, being not prone to loosening, good overall stability, convenient fluid control, safety and reliability.

Description

Technical Field

[0001] This invention relates to the field of plug valve technology, specifically a plug valve for oil drilling. Background Technology

[0002] Drilling plug valves are crucial equipment used in drilling operations to control wellhead pressure and prevent blowouts. In oil and gas drilling operations, blowouts are accidents no driller wants to see on any drilling rig, as they endanger the lives of drilling personnel, damage the rig, and pollute the environment. Fluids and gases typically erupt from the well with great force, at abnormally high pressures. Therefore, plug valves are used to quickly cut off the flow path within the drill string in the event of overflow or blowout, preventing excessive pressure within the drill string from damaging the hoses and surface equipment, thus achieving blowout prevention within the drill string. Drilling plug valves control the opening and closing of the flow path by rotating the valve core, thereby controlling the flow of drilling fluids and playing a key role in ensuring drilling operation safety.

[0003] Currently, existing plug valves used in oil drilling are susceptible to fluid impact as the fluid pressure increases during operation. This impact can cause the plug valve to loosen, and prolonged continuous impact can lead to material fatigue and, in severe cases, damage, resulting in poor fluid control stability. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A plug valve for oil drilling includes:

[0006] The valve body, and a cylinder fixedly installed on the top of the valve body, wherein an inlet pipe and an outlet pipe are sequentially installed on both sides of the surface of the valve body;

[0007] A valve core mechanism for controlling oil drilling fluids, the valve core mechanism being installed inside the valve body and inside the cylinder;

[0008] The valve core mechanism includes a valve stem and a hemispherical cap. The valve stem is threaded inside the cylinder. The hemispherical cap is fixedly connected to the top of the valve stem. A conical sealing block is rotatably installed at the bottom of the valve stem. A wedge block is fixedly connected to the conical surface of the conical sealing block. A slot is opened at the bottom of the surface of the wedge block. A self-locking component is installed inside the valve stem.

[0009] The self-locking assembly includes a drive handle and a connecting guide rod. The end of the drive handle is hinged to the side of the inner cavity of the hemispherical cap. The connecting guide rod is slidably installed in the middle of the valve stem. A return spring is fixedly connected between the outer circular surface of the connecting guide rod and the bottom of the inner cavity of the valve stem. A square locking block is fixedly connected to the bottom end of the connecting guide rod. A pressing tooth is fixedly connected to the rotating end of the drive handle surface. A collar is rotatably installed at the end of the drive handle away from the pressing tooth.

[0010] Preferably, the valve stem passes through the center of the cylinder, and the outer surface of the valve stem is sealed to the top of the valve body. The diameter of the conical sealing block gradually increases from bottom to top. There are three wedge blocks, and the three wedge blocks are evenly distributed on the conical surface of the conical sealing block.

[0011] Preferably, there are two drive handles, and the two drive handles are symmetrically installed along the connecting guide rod. The connecting guide rod passes through the center of the reset spring, and the surface of the square locking block is slidably installed with the center of the conical sealing block.

[0012] Preferably, a baffle assembly is installed in the middle of the valve body cavity. The baffle assembly includes a Z-shaped baffle. The edge of the Z-shaped baffle is fixedly connected to the inner wall of the valve body. A conical hole is opened at the center of the Z-shaped baffle. A snap-fit ​​notch is opened on the inner side of the conical hole. An arc-shaped tooth is fixedly connected in the middle of the inner wall of the snap-fit ​​notch. When the drive handle is rotated to a horizontal state and a lever force is applied to the two symmetrical drive handles, the valve stem can be rotated. Combined with the threaded installation between the valve stem and the cylinder, the valve stem drives the conical sealing block to move downward. The conical sealing block can then be embedded in the center of the conical hole to seal the conical hole. By dividing the inner cavity of the valve body through the Z-shaped baffle, the fluid extracted in oil drilling can be sealed.

[0013] Preferably, the diameter of the conical hole gradually increases from bottom to top, and there are three locking notches, which are evenly distributed on the inner side of the conical hole. As the conical sealing block is embedded into the center of the conical hole, the wedge block is inserted into the inside of the locking notch, which can limit the conical sealing block and the arc-shaped teeth are inserted into the slot for repositioning. This makes it less likely for the conical sealing block to shift, and at the same time, the fit between the conical sealing block and the conical hole is more stable, reducing the influence of fluid pressure.

[0014] By applying a reverse thrust to the drive handle, the valve stem can be rotated in the opposite direction, causing the valve stem to move upward. The valve stem can then move the conical sealing block upward, separating the conical sealing block from the conical orifice, thus opening the conical orifice and allowing the fluid to flow smoothly.

[0015] By allowing fluid to flow through the conical hole and pass through the snap-fit ​​notch, the flow direction of the fluid can be changed under the guidance of the arc-shaped teeth. This impacts the particulate matter attached to the inner surface of the conical hole, reducing the amount of debris adhering to the inner surface of the conical hole and keeping it clean, which helps to seal the conical hole.

[0016] Preferably, an auxiliary component is installed at the bottom of the valve body. The auxiliary component includes a bottom cover, the surface edge of which is fixedly installed to the bottom of the valve body by screws. A cylindrical block is fixedly connected to the center of the top of the bottom cover. A square groove is formed in the middle of the top of the cylindrical block. A fan-shaped notch is formed on the side of the outer surface of the cylindrical block. An annular sealing edge is fixedly connected to the edge of the top of the bottom cover. By installing the bottom cover at the bottom of the valve body, the annular sealing edge can be squeezed to form a seal, which is not easy to leak. As the fluid enters the interior of the valve body from the inlet pipe, the fluid flows through the fan-shaped notch and flows through the center of the square groove, which can flush away the debris inside the square groove and reduce the adhesion of debris.

[0017] Preferably, there are two fan-shaped notches, and the two fan-shaped notches are symmetrically installed along the square groove, and the center of the annular sealing edge coincides with the central axis of the cylindrical block.

[0018] When the conical sealing block is inserted into the conical hole for sealing, the drive handle is rotated to make it vertical. The drive handle then drives the pressing teeth to rotate, which in turn applies pressure to the connecting guide rod. The connecting guide rod slides downward, and the return spring is compressed, causing the connecting guide rod to move the square locking block downward. The bottom end of the square locking block is inserted into the square groove. The collar is then rotated counterclockwise, so that the collar is placed on the top of another drive handle, thus achieving self-locking and preventing the conical sealing block from loosening.

[0019] Preferably, both the inlet pipe and the outlet pipe are equipped with anti-leakage components at their ends away from the valve body. The anti-leakage components include a circular groove and a sealing gasket. The circular groove is located at the end of the inlet pipe and the outlet pipe away from the valve body. The sealing gasket is installed at the end face of the inlet pipe and the end face of the outlet pipe. A semi-circular groove is formed on the inner side of the circular groove. A snap-fit ​​ring is fixedly connected to the center of the sealing gasket surface. A semi-circular protrusion is fixedly connected to the annular surface of the snap-fit ​​ring. A limiting through-hole is formed on the side of the sealing gasket surface. By embedding the semi-circular protrusion into the semi-circular groove, the snap-fit ​​ring can be positioned. An external connecting bolt passes through the limiting through-hole, thus limiting the sealing gasket and preventing overall displacement, resulting in good connection stability.

[0020] Preferably, the annular surface of the snap-fit ​​ring is embedded inside the circular groove, the semi-circular grooves are evenly distributed on the inner side of the circular groove, and the sealing gasket and the snap-fit ​​ring are concentric circles.

[0021] By using a sealing gasket tightly attached to the ports of the inlet and outlet pipes, and by using the annular surface of the snap-fit ​​ring to embed into the interior of the circular groove, the sealing gasket and snap-fit ​​ring make curved contact with the ports of the inlet and outlet pipes, increasing the contact area and thus enabling a labyrinth seal, which is less prone to leakage.

[0022] Preferably, the spherical surface of the semicircular protrusion is embedded in the interior of the semicircular groove, there are four semicircular grooves, and the four semicircular grooves are evenly distributed on the inner side of the circular groove, and there are four semicircular protrusions, and the four semicircular protrusions are evenly distributed on the annular surface of the snap ring.

[0023] This invention provides a plug valve for oil drilling. It has the following advantages:

[0024] 1. This plug valve for oil drilling, when the drive handle is turned to a horizontal position and a lever force is applied to the two symmetrical drive handles, causes the valve stem to rotate. Combined with the threaded installation between the valve stem and the cylinder, the valve stem drives the conical sealing block to move downwards. The conical sealing block can then be embedded in the center of the conical hole, thereby sealing the conical hole. The internal cavity of the valve body is separated by a Z-shaped baffle, which can seal the fluid extracted during oil drilling.

[0025] Second, in this plug valve for oil drilling, as the conical plugging block is embedded in the center of the conical hole, the wedge block is inserted into the inside of the locking notch, which can limit the conical plugging block and the arc-shaped teeth are inserted into the locking groove for repositioning. This makes it less likely for the conical plugging block to shift, and at the same time, the fit between the conical plugging block and the conical hole is more stable, reducing the impact of fluid pressure.

[0026] Third, the plug valve used in oil drilling can cause the valve stem to rotate in the opposite direction by applying a reverse thrust to the drive handle, so that the valve stem moves upward. The valve stem can be used to move the conical sealing block upward, and the conical sealing block separates from the conical hole, so that the conical hole can be opened, making it easier for fluid to flow from the conical hole and making the fluid flow smooth.

[0027] IV. This plug valve for oil drilling allows fluid to flow through a conical orifice, passing through a snap-fit ​​notch. Guided by the arc-shaped teeth, the flow direction of the fluid is changed, thereby impacting the particulate matter attached to the inner surface of the conical orifice. This reduces the amount of debris adhering to the inner surface of the conical orifice, keeping it clean and facilitating sealing.

[0028] 5. The plug valve for oil drilling uses a bottom cover installed at the bottom of the valve body to squeeze the annular sealing edge, thus sealing it and preventing leakage. As the fluid enters the valve body from the inlet pipe, it flows through the fan-shaped notch and passes through the center of the square groove, flushing out debris and reducing its adhesion.

[0029] VI. The plug valve for oil drilling, when the drive handle is rotated to a vertical position, can drive the pressing teeth to rotate together, so that the pressing teeth apply pressure to the connecting guide rod. The connecting guide rod slides downward, and the return spring is compressed, so that the connecting guide rod drives the square locking block to move downward together. The bottom end of the square locking block is inserted into the inside of the square groove, and the collar is rotated counterclockwise, so that the collar is placed on the top of another drive handle, thus achieving self-locking and preventing the conical sealing block from loosening.

[0030] 7. The plug valve for oil drilling uses a semi-circular protrusion that is embedded in the semi-circular groove to position the locking ring. The external connecting bolt passes through the limiting hole, which limits the sealing gasket and prevents the sealing gasket from shifting. The connection is stable.

[0031] 8. The plug valve for oil drilling uses a sealing gasket that fits tightly against the inlet and outlet ports, and the annular surface of the snap-fit ​​ring is embedded in the circular groove. This creates a curved contact between the sealing gasket and the snap-fit ​​ring and the inlet and outlet ports, increasing the contact area and enabling a labyrinth seal, thus reducing the likelihood of leakage. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the plug valve for oil drilling according to the present invention;

[0033] Figure 2 This is a schematic diagram of the disassembled structure of the plug valve for oil drilling according to the present invention;

[0034] Figure 3 This is a schematic diagram of the connection structure between the valve core mechanism, valve body, and cylinder of the present invention;

[0035] Figure 4 This is a schematic diagram of the overall structure of the self-locking component of the present invention;

[0036] Figure 5 This is a schematic diagram of the connection structure between the barrier assembly and the valve body of the present invention;

[0037] Figure 6 This is a schematic diagram of the overall structure of the barrier component of the present invention;

[0038] Figure 7 This is a schematic diagram of the connection structure between the auxiliary component and the valve body of the present invention;

[0039] Figure 8 This is a schematic diagram of the overall structure of the auxiliary component of the present invention;

[0040] Figure 9 This is a schematic diagram of the overall structure of the anti-leakage component of the present invention.

[0041] In the diagram: 1. Valve body; 2. Cylinder; 3. Inlet pipe; 4. Outlet pipe; 5. Valve core mechanism; 6. Auxiliary components; 7. Leak-proof components; 8. Baffle components; 51. Valve stem; 52. Semi-spherical cap; 53. Conical sealing block; 54. Wedge block; 55. Slot; 56. Self-locking components; 561. Drive handle; 562. Connecting guide rod; 563. Return spring; 564. Square locking block; 565. Pressing teeth; 566. Collar; 61. Bottom cover; 62. Cylindrical block; 63. Square groove; 64. Fan-shaped notch; 65. Annular sealing edge; 71. Circular groove; 72. Sealing gasket; 73. Semi-circular groove; 74. Snap-fit ​​ring; 75. Semi-circular protrusion; 76. Limiting through hole; 81. Z-shaped partition; 82. Conical hole; 83. Snap-fit ​​notch; 84. Arc-shaped teeth. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] First embodiment, such as Figures 1 to 6 As shown, the present invention provides a technical solution:

[0044] A plug valve for oil drilling includes:

[0045] The valve body 1 and the cylinder 2 fixedly installed on the top of the valve body 1 are provided with an inlet pipe 3 and an outlet pipe 4 installed on both sides of the surface of the valve body 1 in sequence.

[0046] Valve core mechanism 5 is used to control oil drilling fluid. Valve core mechanism 5 is installed inside the valve body 1 and inside the cylinder 2.

[0047] The valve core mechanism 5 includes a valve stem 51 and a hemispherical cap 52. The valve stem 51 is threaded inside the cylinder 2. The hemispherical cap 52 is fixedly connected to the top of the valve stem 51. A conical sealing block 53 is rotatably installed at the bottom of the valve stem 51. A wedge block 54 is fixedly connected to the conical surface of the conical sealing block 53. A slot 55 is opened at the bottom of the surface of the wedge block 54. A self-locking component 56 is installed inside the valve stem 51.

[0048] The valve stem 51 passes through the center of the cylinder 2. The outer circular surface of the valve stem 51 is sealed between the valve body 1 and the top. The diameter of the conical sealing block 53 gradually increases from bottom to top. There are three wedge blocks 54, and the three wedge blocks 54 are evenly distributed on the conical surface of the conical sealing block 53.

[0049] The self-locking assembly 56 includes a drive handle 561 and a connecting guide rod 562. The end of the drive handle 561 is hinged to the side of the inner cavity of the hemispherical cap 52. The connecting guide rod 562 is slidably installed in the middle of the valve stem 51. A return spring 563 is fixedly connected between the outer circular surface of the connecting guide rod 562 and the bottom of the inner cavity of the valve stem 51. A square locking block 564 is fixedly connected to the bottom end of the connecting guide rod 562. A pressing tooth 565 is fixedly connected to the rotating end of the surface of the drive handle 561. A collar 566 is rotatably installed at the end of the drive handle 561 away from the pressing tooth 565.

[0050] There are two drive handles 561, and the two drive handles 561 are symmetrically installed along the connecting guide rod 562. The connecting guide rod 562 passes through the center of the return spring 563. The surface of the square locking block 564 is slidably installed with the center of the conical sealing block 53.

[0051] A baffle assembly 8 is installed in the middle of the inner cavity of the valve body 1. The baffle assembly 8 includes a Z-shaped baffle 81. The edge of the surface of the Z-shaped baffle 81 is fixedly connected to the inner wall of the valve body 1. A conical hole 82 is opened in the center of the Z-shaped baffle 81. A snap-fit ​​notch 83 is opened on the inner side of the conical hole 82. An arc-shaped tooth 84 is fixedly connected in the middle of the inner wall of the snap-fit ​​notch 83. When the drive handle 561 is rotated to a horizontal state and a turning force is applied to the two symmetrical drive handles 561, the valve stem 51 can be rotated. Combined with the threaded installation between the valve stem 51 and the cylinder 2, the valve stem 51 drives the conical sealing block 53 to move downward. The conical sealing block 53 can be embedded in the center of the conical hole 82 to block the conical hole 82. The inner cavity of the valve body 1 is separated by the Z-shaped baffle 81.

[0052] The diameter of the conical hole 82 gradually increases from bottom to top, and there are three snap-fit ​​notches 83, which are evenly distributed on the inner side of the conical hole 82.

[0053] As the conical sealing block 53 is embedded into the center of the conical hole 82, the wedge block 54 is inserted into the inside of the snap-fit ​​notch 83, which can limit the conical sealing block 53. The arc-shaped tooth 84 is inserted into the slot 55, which can reposition it, making it less likely for the conical sealing block 53 to shift. At the same time, the conical sealing block 53 and the conical hole 82 are more stably matched.

[0054] By applying a reverse thrust to the drive handle 561, the valve stem 51 can be rotated in the opposite direction, causing the valve stem 51 to move upward. The valve stem 51 can then move the conical sealing block 53 upward, separating the conical sealing block 53 from the conical hole 82, thus opening the conical hole 82 and allowing fluid to flow through it.

[0055] The fluid flows through the conical hole 82 and then through the snap-fit ​​notch 83. Under the guidance of the arc-shaped teeth 84, the flow direction of the fluid is changed, thereby impacting the particulate matter attached to the inner surface of the conical hole 82. This reduces the amount of debris adhering to the inner surface of the conical hole 82, keeping the inner surface of the conical hole 82 clean and helping to seal the conical hole 82.

[0056] The second embodiment is based on the first embodiment; please refer to [link / reference]. Figures 1 to 8 As shown:

[0057] An auxiliary component 6 is installed at the bottom of the valve body 1. The auxiliary component 6 includes a bottom cover 61. The surface edge of the bottom cover 61 is fixedly installed to the bottom of the valve body 1 by screws. A cylindrical block 62 is fixedly connected to the center of the top of the bottom cover 61. A square groove 63 is opened in the middle of the top of the cylindrical block 62. A fan-shaped notch 64 is opened on the side of the outer circle of the cylindrical block 62. An annular sealing edge 65 is fixedly connected to the edge of the top of the bottom cover 61. By installing the bottom cover 61 at the bottom of the valve body 1, the annular sealing edge 65 can be squeezed to seal, making it less prone to leakage. As the fluid enters the interior of the valve body 1 from the inlet pipe 3, the fluid flows through the fan-shaped notch 64 and flows through the center of the square groove 63, thus flushing out the debris inside the square groove 63.

[0058] There are two fan-shaped notches 64, and the two fan-shaped notches 64 are symmetrically installed along the square groove 63. The center of the annular sealing edge 65 coincides with the central axis of the cylindrical block 62.

[0059] When the conical sealing block 53 is inserted into the conical hole 82 for sealing, and the drive handle 561 is rotated so that the drive handle 561 is in a vertical position, the drive handle 561 can drive the pressing tooth 565 to rotate together, so that the pressing tooth 565 applies pressing force to the connecting guide rod 562. The connecting guide rod 562 slides downward, and the return spring 563 is compressed, so that the connecting guide rod 562 drives the square locking block 564 to move downward together. The bottom end of the square locking block 564 is inserted into the square groove 63, and the collar 566 is rotated counterclockwise, so that the collar 566 is placed on the top of another drive handle 561 for self-locking.

[0060] The third embodiment is based on embodiments one and two; please refer to [link / reference]. Figures 1 to 9 As shown:

[0061] Both the inlet pipe 3 and the outlet pipe 4 are equipped with a leak-proof component 7 at the ends away from the valve body 1. The leak-proof component 7 includes a circular groove 71 and a sealing gasket 72. The circular groove 71 is located at the ends of the inlet pipe 3 and the outlet pipe 4 away from the valve body 1. The sealing gasket 72 is installed at the end face of the inlet pipe 3 and the end face of the outlet pipe 4. A semi-circular groove 73 is provided on the inner side of the circular groove 71. A snap-fit ​​ring 74 is fixedly connected to the middle of the surface of the sealing gasket 72. A semi-circular protrusion 75 is fixedly connected to the annular surface of the snap-fit ​​ring 74. A limiting through hole 76 is provided on the side of the surface of the sealing gasket 72. The snap-fit ​​ring 74 can be positioned by the semi-circular protrusion 75 being embedded into the semi-circular groove 73. The sealing gasket 72 is limited by the external connecting bolt passing through the limiting through hole 76, and the sealing gasket 72 will not shift as a whole.

[0062] The annular surface of the snap ring 74 is embedded into the interior of the circular groove 71, and the semi-circular grooves 73 are evenly distributed on the inner side of the circular groove 71. The sealing gasket 72 and the snap ring 74 are concentric circles.

[0063] The sealing gasket 72 is tightly attached to the port of the inlet pipe 3 and the port of the outlet pipe 4, and the annular surface of the snap ring 74 is embedded into the inside of the circular groove 71, so that the sealing gasket 72 and the snap ring 74 have curved surface contact with the port of the inlet pipe 3 and the port of the outlet pipe 4, which increases the contact area and performs a labyrinth seal.

[0064] The spherical surface of the semicircular protrusion 75 is embedded in the interior of the semicircular groove 73. There are four semicircular grooves 73, and the four semicircular grooves 73 are evenly distributed on the inner side of the circular groove 71. There are four semicircular protrusions 75, and the four semicircular protrusions 75 are evenly distributed on the annular surface of the snap ring 74.

[0065] In use, first install the sealing gasket 72 onto the port of the inlet pipe 3 and the port of the outlet pipe 4. Then, install and fix the plug valve as a whole through the flange at the end of the inlet pipe 3 and the outlet pipe 4 away from the valve body 1. The snap ring 74 can be positioned by embedding the semi-circular protrusion 75 into the interior of the semi-circular groove 73. The sealing gasket 72 is limited by the external connecting bolt passing through the limiting through hole 76, so that the sealing gasket 72 will not shift.

[0066] The sealing gasket 72 is tightly attached to the port of the inlet pipe 3 and the port of the outlet pipe 4, and the annular surface of the snap ring 74 is embedded into the inside of the circular groove 71, so that the sealing gasket 72 and the snap ring 74 are in curved contact with the port of the inlet pipe 3 and the port of the outlet pipe 4, increasing the contact area and performing a labyrinth seal.

[0067] Rotating the drive handle 561 to a horizontal position and applying a lever force to the two symmetrical drive handles 561 will cause the valve stem 51 to rotate. Combined with the threaded installation between the valve stem 51 and the cylinder 2, the valve stem 51 will drive the conical sealing block 53 to move downward. The conical sealing block 53 can then be embedded in the center of the conical hole 82 to seal the conical hole 82. The inner cavity of the valve body 1 is separated by the Z-shaped partition 81.

[0068] Furthermore, as the conical sealing block 53 is embedded into the center of the conical hole 82, the wedge block 54 is inserted into the inside of the snap-fit ​​notch 83, which can limit the conical sealing block 53, and the arc-shaped tooth 84 is inserted into the slot 55, which can be repositioned, making it less likely for the conical sealing block 53 to shift. At the same time, the conical sealing block 53 and the conical hole 82 are more stably matched.

[0069] Simultaneously, when the conical sealing block 53 is embedded into the conical hole 82 for sealing, and the drive handle 561 is rotated so that the drive handle 561 is in a vertical state, the drive handle 561 can drive the pressing tooth 565 to rotate together, so that the pressing tooth 565 applies pressing force to the connecting guide rod 562. The connecting guide rod 562 slides downward, and the return spring 563 is compressed, so that the connecting guide rod 562 drives the square locking block 564 to move downward together. The bottom end of the square locking block 564 is inserted into the square groove 63, and the collar 566 is rotated counterclockwise, so that the collar 566 is placed on the top of another drive handle 561 for self-locking.

[0070] When it is necessary to open the valve, the collar 566 is rotated in the opposite direction, and the valve stem 51 is rotated in the opposite direction by applying a reverse thrust to the drive handle 561. This causes the valve stem 51 to move upward, which in turn moves the conical sealing block 53 upward. The conical sealing block 53 separates from the conical hole 82, which opens the conical hole 82, allowing fluid to flow through it.

[0071] Furthermore, the fluid flows through the conical hole 82 and passes through the snap notch 83. Under the guidance of the arc-shaped teeth 84, the flow direction of the fluid can be changed, thereby impacting the particulate matter attached to the inner surface of the conical hole 82, reducing the amount of debris attached to the inner surface of the conical hole 82, and keeping the inner surface of the conical hole 82 clean. The fluid flows from the inside of the valve body 1 to the inside of the outlet pipe 4 and flows out from the outlet of the outlet pipe 4.

[0072] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0073] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A plug valve for oil drilling, characterized in that, include: The valve body (1) and the cylinder (2) fixedly installed on the top of the valve body (1) are provided with an inlet pipe (3) and an outlet pipe (4) installed on both sides of the surface of the valve body (1). Valve core mechanism (5), which is used to control oil drilling fluid, is installed inside the valve body (1) and inside the cylinder (2); The valve core mechanism (5) includes a valve stem (51) and a hemispherical cap (52). The valve stem (51) is threaded inside the cylinder (2). The hemispherical cap (52) is fixedly connected to the top of the valve stem (51). A conical sealing block (53) is rotatably installed at the bottom of the valve stem (51). A wedge block (54) is fixedly connected to the conical surface of the conical sealing block (53). A slot (55) is opened at the bottom of the surface of the wedge block (54). A self-locking component (56) is installed inside the valve stem (51). The self-locking assembly (56) includes a drive handle (561) and a connecting guide rod (562). The end of the drive handle (561) is hinged to the side of the inner cavity of the hemispherical cap (52). The connecting guide rod (562) is slidably installed in the middle of the valve stem (51). A return spring (563) is fixedly connected between the outer circular surface of the connecting guide rod (562) and the bottom of the inner cavity of the valve stem (51). A square locking block (564) is fixedly connected to the bottom end of the connecting guide rod (562). A pressing tooth (565) is fixedly connected to the rotating end of the surface of the drive handle (561). A collar (566) is rotatably installed at the end of the drive handle (561) away from the pressing tooth (565). A baffle assembly (8) is installed in the middle of the inner cavity of the valve body (1). The baffle assembly (8) includes a Z-shaped baffle (81). The edge of the surface of the Z-shaped baffle (81) is fixedly connected to the inner wall of the valve body (1). A conical hole (82) is opened in the center of the Z-shaped baffle (81). A snap-fit ​​notch (83) is opened on the inner side of the conical hole (82). An arc-shaped tooth (84) is fixedly connected in the middle of the inner wall of the snap-fit ​​notch (83). A conical sealing block (53) is embedded in the center of the conical hole (82) to seal the conical hole (82). The inner cavity of the valve body (1) is separated by the Z-shaped baffle (81). An auxiliary component (6) is installed at the bottom of the valve body (1). The auxiliary component (6) includes a bottom cover (61). The bottom cover (61) is fixedly installed to the bottom of the valve body (1) by screws at the surface edge. A cylindrical block (62) is fixedly connected to the center of the top of the bottom cover (61). A square groove (63) is opened in the middle of the top of the cylindrical block (62). A fan-shaped notch (64) is opened on the side of the outer circular surface of the cylindrical block (62). An annular sealing edge (65) is fixedly connected to the edge of the top of the bottom cover (61). The bottom end of the square locking block (564) is inserted into the inside of the square groove (63).

2. A plug valve for oil drilling according to claim 1, characterized in that: The valve stem (51) passes through the center of the cylinder (2), and the outer circular surface of the valve stem (51) is sealed between the valve body (1) and the top. The diameter of the conical sealing block (53) gradually increases from bottom to top. There are three wedge blocks (54), and the three wedge blocks (54) are evenly distributed on the conical surface of the conical sealing block (53).

3. A plug valve for oil drilling according to claim 1, characterized in that: There are two drive handles (561), and the two drive handles (561) are symmetrically installed along the connecting guide rod (562). The connecting guide rod (562) passes through the center of the return spring (563). The surface of the square locking block (564) is slidably installed at the center of the conical sealing block (53).

4. A plug valve for oil drilling according to claim 1, characterized in that: The diameter of the conical hole (82) gradually increases from bottom to top, and there are three snap-fit ​​notches (83), which are evenly distributed on the inner side of the conical hole (82).

5. A plug valve for oil drilling according to claim 1, characterized in that: There are two fan-shaped notches (64), and the two fan-shaped notches (64) are symmetrically installed along the square groove (63). The center of the annular sealing edge (65) coincides with the central axis of the cylindrical block (62).

6. A plug valve for oil drilling according to claim 1, characterized in that: Both the inlet pipe (3) and the outlet pipe (4) are equipped with a leak-proof component (7) at the end away from the valve body (1). The leak-proof component (7) includes a circular groove (71) and a sealing gasket (72). The circular groove (71) is opened at the end of the inlet pipe (3) and the outlet pipe (4) away from the valve body (1). The sealing gasket (72) is installed at the end face of the inlet pipe (3) and the end face of the outlet pipe (4). A semi-circular groove (73) is opened on the inner side of the circular groove (71). A snap-fit ​​ring (74) is fixedly connected to the middle of the surface of the sealing gasket (72). A semi-circular protrusion (75) is fixedly connected to the annular surface of the snap-fit ​​ring (74). A limit hole (76) is opened on the side of the surface of the sealing gasket (72).

7. A plug valve for oil drilling according to claim 6, characterized in that: The annular surface of the snap ring (74) is embedded in the interior of the circular groove (71), the semi-circular groove (73) is evenly distributed on the inner side of the circular groove (71), and the sealing gasket (72) and the snap ring (74) are concentric circles.

8. A plug valve for oil drilling according to claim 6, characterized in that: The spherical surface of the semicircular protrusion (75) is embedded in the interior of the semicircular groove (73). There are four semicircular grooves (73), and the four semicircular grooves (73) are evenly distributed on the inner side of the circular groove (71). There are four semicircular protrusions (75), and the four semicircular protrusions (75) are evenly distributed on the annular surface of the snap ring (74).

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