A kelly cock valve with flushing channel

Abstract

The present application belongs to the technical field of plug valves, and discloses a self-flushing anti-blocking kelly plug valve, which comprises a valve body and a valve core piece rotatably installed in the valve body, and two groups of spring combined gaskets, sealing assemblies and cleaning flow channel assemblies are arranged in mirror image directions in the valve body. The cooperation between the sealing assembly, the cleaning flow channel assembly, the gas conveying assembly and the spring combined gasket makes the sealing ring separate from the outer periphery of the valve core piece and unblock the gas passage hole, so that the gas in the gas passage hole is discharged at high speed, the impurities such as rock debris and sand particles adhered to the outer periphery of the valve core piece are flushed and cleaned, then the operator rotates the valve core piece by using a hexagonal wrench to achieve closing, and the continuously discharged gas at the gas passage hole forms a protective gas curtain on the sealing surface during the whole closing process, effectively preventing the impurities from entering the sealing surface during the closing process, thereby ensuring the sealing effect of the sealing ring and the rotation flexibility of the valve core piece.

Description

Technical Field

[0001] This invention belongs to the field of plug valve technology, specifically a plug valve for anti-clogging square drill pipe with a built-in flushing channel. Background Technology

[0002] The angular drill pipe plug valve is a key manual control valve in the drill string circulation system of oil drilling. It belongs to the category of blowout preventers within the drill string and comes in two types: upper and lower plug valves. These are installed at the upper and lower ends of the angular drill pipe, respectively. The valve is opened or closed by rotating the valve core 90° with a special wrench. During normal drilling, it is fully open to ensure unobstructed drilling fluid circulation. In emergencies such as overflow, blowout, or abnormal pressure, it is quickly closed to cut off the internal passage of the drill string and prevent blowout accidents. Existing angular drill pipe plug valves typically employ a structure where a spherical valve core mates with a valve seat, and a sealing ring is used to achieve a seal between the valve core and the valve body.

[0003] However, existing plug valves for square drill pipe have the following problems in practical use: Drilling fluid contains solid particles such as rock cuttings, sand, and rust, which easily deposit and adhere to the outer circumference of the valve core and the sealing surface. When the plug valve needs to be closed, these impurities can hinder the proper fit of the sealing ring, leading to sealing failure and internal or external leakage. Furthermore, when the sealing surface becomes blocked, existing plug valves typically require complete disassembly for cleaning and maintenance, which is cumbersome and time-consuming. In emergency well control situations, this blockage cannot be cleared in time, delaying well shut-in and posing significant safety hazards. Therefore, how to perform online flushing and cleaning of the sealing surface before closing the plug valve to prevent impurities from affecting the sealing effect and operational flexibility has become a pressing technical problem to be solved in this field. Summary of the Invention

[0004] To address the problems mentioned in the background art, the present invention provides an anti-clogging square drill pipe plug valve with a built-in flushing channel, which solves the problem that existing square drill pipe plug valves may fail to seal due to the inability to effectively clean the impurities deposited on the sealing surface area before closing.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a plug valve for anti-clogging square drill pipe with a built-in flushing channel, comprising a valve body and a valve core rotatably installed therein, wherein two sets of spring combination washers, a sealing assembly and a cleaning flow channel assembly are arranged in a mirror direction within the valve body; the sealing assembly includes a sleeve movably installed within the valve body, and a sealing ring is provided at one end of the sleeve near the valve core. The cleaning channel assembly includes a channel cylinder that is fixedly installed on the valve body and has one end in contact with the outer periphery of the sealing ring. The channel cylinder has a plurality of air passage holes facing the valve core in a ring array direction. A hollow piston rod is fixedly connected to the top of the cleaning channel assembly. The top end of the hollow piston rod extends upward into the sleeve and divides the cavity of the sleeve into a lower cavity below the piston end of the sleeve and an upper cavity above the piston end of the sleeve; the valve core is equipped with a gas delivery assembly for sending gas into the flow channel cylinder; the end of the spring combination washer facing the sleeve is connected to the sleeve through its spring portion, and in the initial state, the outer periphery of the sleeve will block the gas passage hole; One end of the valve core extends to the valve body, and an internal hexagonal hole is provided at the end.

[0006] Preferably, an elastic sealing connector is fixedly connected between the annular portion of the spring assembly washer and the sealing assembly.

[0007] Preferably, the valve core is provided with two sets of arc-shaped grooves with an arc of 90 degrees in a circular array direction, and two sets of limiting shafts that can slide in the corresponding arc-shaped grooves are fixedly installed in the valve body.

[0008] Preferably, a separator pad located inside the sleeve is fixedly installed at one end of the sleeve near the valve core, and the end of the separator pad near the valve core is in contact with the valve core.

[0009] Preferably, the sleeve has an independent cavity that can communicate with the corresponding upper cavity. An elastic locking pin is movably installed on the top of the sleeve. One end of the elastic locking pin can pass through the sleeve and be locked into the inner wall of the valve body. An elastic diaphragm for isolating the independent cavity from the upper cavity is fixedly installed in the independent cavity. One end of the elastic locking pin is fixedly connected to the elastic diaphragm.

[0010] Preferably, the diameter of the piston end of the hollow piston rod is larger than the diameter of its rod body.

[0011] Preferably, the gas delivery assembly includes a collar movably sleeved on the outer periphery of the valve core rod portion. A set of connecting pipes are fixedly connected to the collar in a symmetrical direction. The other end of the connecting pipes is connected to the flow channel cylinder. The valve core rod portion has a columnar hole located inside the internal hexagonal hole. The valve core has a through hole that can communicate with the columnar hole. A spring combination valve core that can initially block the through hole is movably installed in the columnar hole. The spring combination valve core has an annular groove. A gas delivery pipe is fixedly connected to the collar. The gas delivery pipe can communicate through the annular groove, the through hole, and the connecting pipes.

[0012] Preferably, the other end of the gas supply pipe is connected to the gas pump, and a gas storage tank is provided between the end of the gas supply pipe and the gas pump, with an exhaust valve installed on the gas storage tank.

[0013] Preferably, the sleeve has a vertical groove at its bottom outer periphery, and the inner wall of the flow channel cylinder has a vertical ridge that can slide within the vertical groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The above solution, through the cooperation of the sealing components, cleaning flow channel components, gas supply components, and spring combination washers, allows the device to inject high-pressure gas into the flow channel cylinder through the gas supply components before closing the plug valve. The gas enters the upper cavity through the hollow piston rod and pushes the sleeve upward, causing the sealing ring to detach from the outer circumference of the valve core and release the blockage of the air passage hole. This allows the gas in the air passage hole to be discharged at high speed, washing and cleaning the rock chips, sand particles, and other impurities attached to the outer circumference of the valve core. Then, the operator can turn the valve core with a hex wrench to close it. Throughout the closing process, the gas continuously discharged from the air passage hole forms a protective air curtain on the sealing surface, effectively preventing impurities from entering the sealing surface during the closing process, thereby ensuring the sealing effect of the sealing ring and the rotational flexibility of the valve core. The above solution utilizes the combined design of an elastic locking pin and an elastic diaphragm. When gas enters the upper chamber, the increased pressure pushes the elastic diaphragm towards the independent chamber. The diaphragm then causes the end of the elastic locking pin to disengage from the inner wall of the valve body, releasing the sleeve and allowing it to move upwards smoothly for subsequent flushing operations. During reset, the pressure in the upper chamber decreases. Under the combined action of the original pressure in the independent chamber and the elastic force of the diaphragm, the elastic locking pin resets and re-engages in the valve body cavity. This achieves automatic locking and unlocking control of the sleeve, ensuring that the sleeve does not experience vertical displacement due to pressure fluctuations within the valve body during the sealing process with the valve core. This effectively improves the stability and reliability of the seal. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front cross-sectional view of the valve body of the present invention; Figure 3 This is a schematic diagram of the mating structure of the valve core, sealing assembly, and cleaning flow channel assembly of the present invention; Figure 4 This is a schematic diagram of the structure of the cleaning channel assembly of the present invention; Figure 5 This is a front cross-sectional view of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 8 This is a schematic diagram of the test structure of the present invention.

[0016] In the diagram: 1. Valve body; 2. Valve core; 21. Arc groove; 22. Limiting shaft; 23. Through hole; 3. Spring combination washer; 31. Elastic sealing connector; 4. Sealing assembly; 41. Sleeve; 411. Separator; 42. Sealing ring; 43. Upper cavity; 431. Independent cavity; 44. Lower cavity; 5. Cleaning flow channel assembly; 51. Flow channel cylinder; 52. Air passage hole; 53. Hollow piston rod; 6. Gas delivery assembly; 61. Collar; 62. Connecting pipe; 63. Spring combination valve core; 64. Annular groove; 65. Gas delivery pipe; 7. Elastic locking pin; 71. Elastic diaphragm. Detailed Implementation

[0017] 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.

[0018] like Figures 1 to 8 As shown, the present invention provides a plug valve for anti-clogging square drill pipe with a built-in flushing channel, including a valve body 1 and a valve core 2 rotatably installed therein. Two sets of spring combination washers 3, sealing components 4 and cleaning flow channel components 5 are arranged in a mirror direction inside the valve body 1. The sealing component 4 includes a sleeve 41 movably installed inside the valve body 1, and a sealing ring 42 is provided at the end of the sleeve 41 near the valve core 2. The cleaning flow channel assembly 5 includes a flow channel cylinder 51 that is fixedly installed on the valve body 1 and has one end in contact with the outer periphery of the sealing ring 42. The flow channel cylinder 51 has a plurality of air passage holes 52 facing the valve core 2 in a ring array direction. A hollow piston rod 53 is fixedly connected to the top of the cleaning flow channel assembly 5. The top end of the hollow piston rod 53 can extend upward into the sleeve 41 and divide the cavity of the sleeve 41 into a lower cavity 44 located below the piston end of the sleeve 41 and an upper cavity 43 located above its piston end. The valve core 2 is equipped with a gas delivery assembly 6 for delivering gas into the flow channel cylinder 51; the end of the spring combination washer 3 facing the sleeve 41 is connected to the sleeve 41 through its spring portion, and in the initial state, the outer periphery of the sleeve 41 will block the gas passage hole 52; one end of the valve core 2 extends to the valve body 1, and the end is provided with an internal hexagonal hole; the annular portion of the spring combination washer 3 is also fixedly connected to the sealing assembly 4 with an elastic sealing connector 31; the valve core 2 is provided with two sets of arc grooves 21 with an arc of 90 degrees in a ring array direction, and two sets of limiting shafts 22 that can slide in the corresponding arc grooves 21 are fixedly installed in the valve body 1; a separator pad 411 located inside the sleeve 41 is fixedly installed at the end of the sleeve 41 near the valve core 2, and the end of the separator pad 411 near the valve core 2 is in a close fit with the valve core 2. By employing the above scheme, through the cooperation between the sealing component 4, the cleaning flow channel component 5, the gas supply component 6, and the spring combination washer 3, the device can inject high-pressure gas into the flow channel cylinder 51 through the gas supply component 6 before closing the plug valve. The gas enters the upper cavity 43 through the hollow piston rod 53 and pushes the sleeve component 41 upward, causing the sealing ring 42 to detach from the outer periphery of the valve core component 2 and release the blockage of the air passage hole 52, allowing the gas in the air passage hole 52 to be discharged at high speed, washing and cleaning the rock chips, sand particles, and other impurities attached to the outer periphery of the valve core component 2. Then, the operator can turn the valve core component 2 with a hex wrench to close it. During the entire closing process, the gas continuously discharged from the air passage hole 52 forms a protective air curtain on the sealing surface, effectively preventing impurities from entering the sealing surface during the closing process, thereby ensuring the sealing effect of the sealing ring 42 and the rotational flexibility of the valve core component 2. By setting the separator 411, it is possible to prevent external impurities from entering when the gas is blown out through the air passage 52.

[0019] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the sleeve 41 has an independent cavity 431 that can communicate with the corresponding upper cavity 43. An elastic locking rod 7 is movably installed on the top of the sleeve 41. One end of the elastic locking rod 7 can pass through the sleeve 41 and be locked into the inner wall of the valve body 1. An elastic diaphragm 71 for isolating the independent cavity 431 from the upper cavity 43 is fixedly installed in the independent cavity 431. One end of the elastic locking rod 7 is fixedly connected to the elastic diaphragm 71. The diameter of the piston end of the hollow piston rod 53 is larger than the diameter of its rod body to ensure that the gas injected into the upper cavity 43 can provide greater pressure while reducing the burden on the air pump. By adopting the above scheme, through the cooperative design of the elastic locking pin 7 and the elastic diaphragm 71, after the gas enters the upper cavity 43, the pressure inside the upper cavity 43 increases, pushing the elastic diaphragm 71 to be recessed into the independent cavity 431. The elastic diaphragm 71 drives the end of the elastic locking pin 7 to disengage from the inner wall of the valve body 1 to release the lock on the sleeve 41, allowing the sleeve 41 to move smoothly upward for subsequent flushing operations. During reset, the pressure inside the upper cavity 43 decreases. Under the combined action of the original pressure in the independent cavity 431 and the elastic force of the elastic diaphragm 71, the elastic locking pin 7 is reset and re-locked into the cavity of the valve body 1. This achieves automatic locking and unlocking control of the sleeve 41, ensuring that the sleeve 41 will not be displaced vertically due to pressure fluctuations inside the valve body 1 during the sealing process of the sealing ring 42 in contact with the valve core 2, effectively improving the stability and reliability of the seal.

[0020] like Figures 2-8 As shown, the gas delivery assembly 6 includes a collar 61 movably sleeved on the outer periphery of the rod portion of the valve core 2. A set of connecting pipes 62 are fixedly connected to the collar 61 in a symmetrical direction. The other end of the connecting pipes 62 is connected to the flow channel cylinder 51. The rod portion of the valve core 2 has a columnar hole located inside the internal hexagonal hole. The valve core 2 has a through hole 23 that can communicate with the columnar hole. A spring combination valve core 63 that can initially block the through hole 23 is movably installed in the columnar hole. The spring combination valve core 63 has an annular groove 64. A gas delivery pipe 65 is fixedly connected to the collar 61. The gas delivery pipe 65 can communicate through the annular groove 64, the through hole 23 and the connecting pipes 62. The other end of the gas supply pipe 65 is connected to the air pump, and an air storage tank is provided between the end of the gas supply pipe 65 and the air pump. An exhaust valve is installed on the air storage tank. The sleeve 41 has a vertical groove at the bottom of its outer periphery, and the flow channel cylinder 51 has a vertical ridge that can slide in the vertical groove on its inner wall. Using the above scheme, when the operator inserts the hex wrench into the internal hexagonal hole, it will also push the spring combination valve core 63 to move, so that the connecting pipe 62 can be connected to the gas supply pipe 65 through the through hole 23 and the annular groove 64, so as to facilitate the injection of gas when the device is working; when resetting, the operator needs to keep the hex wrench inserted into the internal hexagonal hole so that the gas in the upper cavity 43 can be completely discharged.

[0021] Working principle and usage process of this invention: When closing, gas is injected into the flow channel 51 through the pump body and the gas delivery assembly 6. The gas first enters the upper cavity 43 through the flow channel 51 and the hollow piston rod 53, which in turn pushes the sleeve 41 upward to release the sealing ring 42 from contact with the outer periphery of the valve core 2. At the same time, the outer periphery of the sleeve 41 releases the blockage of the air passage hole 52. The gas in the flow channel 51 is discharged through the air passage hole 52 and cleans the impurities attached to the outer periphery of the valve core 2. Then, the operator inserts a hex wrench into the internal hexagonal hole to rotate and close the valve core 2. During the closing process, the gas discharged from the air passage hole 52 will continue to clean the outer periphery of the valve core 2, thereby preventing impurities from entering. After the valve core 2 is closed, the pump body stops running, and the gas in the upper cavity 43 is discharged in the reverse direction through the hollow piston rod 53. The sleeve 41 will also drive the sealing ring 42 to reset and re-seal the outer periphery of the valve core 2. After the gas enters the upper cavity 43, the elastic locking pin 7 is stuck in the inner wall of the valve body 1. At this time, the pressure in the upper cavity 43 increases, which pushes the elastic diaphragm 71 to the independent cavity 431. At this time, the elastic diaphragm 71 will drive the end of the elastic locking pin 7 to disengage from the valve body 1 to release the lock on the sleeve 41. During the reset, the pressure in the upper cavity 43 decreases. Under the original pressure of the independent cavity 431 and the elastic force of the elastic diaphragm 71 itself, the elastic locking pin 7 will be reset and re-locked into the cavity of the valve body 1. This ensures that the sealing ring 42 avoids the situation where the sleeve 41 moves in the vertical direction when the pressure in the valve body 1 changes during the sealing process with the valve core 2.

[0022] 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 process, method, article, or apparatus.

[0023] 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 anti-clogging square drill pipe with a built-in flushing channel, comprising a valve body (1) and a valve core (2) rotatably mounted therein, characterized in that: The valve body (1) is provided with two sets of spring combination washers (3), sealing components (4) and cleaning flow channel components (5) in a mirror direction. The sealing assembly (4) includes a sleeve (41) movably installed inside the valve body (1), and a sealing ring (42) is provided at one end of the sleeve (41) near the valve core (2). The cleaning flow channel assembly (5) includes a flow channel cylinder (51) fixedly installed on the valve body (1) and one end in contact with the outer periphery of the sealing ring (42). The flow channel cylinder (51) has a plurality of air passage holes (52) facing the valve core (2) in a ring array direction. A hollow piston rod (53) is fixedly connected to the top of the cleaning flow channel assembly (5). The top end of the hollow piston rod (53) can extend upward into the sleeve (41) and divide the cavity of the sleeve (41) into a lower cavity (44) located below the piston end of the sleeve (41) and an upper cavity (43) located above its piston end. The valve core (2) is equipped with a gas delivery assembly (6) for delivering gas into the flow channel cylinder (51); The spring combination washer (3) is connected to the sleeve (41) at one end facing the sleeve (41) through the spring portion thereon. In the initial state, the outer periphery of the sleeve (41) will block the air passage hole (52). One end of the valve core (2) extends to the valve body (1), and an internal hexagonal hole is provided at the end.

2. The anti-clogging square drill pipe plug valve with built-in flushing channel according to claim 1, characterized in that: An elastic sealing connector (31) is also fixedly connected between the annular portion of the spring assembly washer (3) and the sealing assembly (4).

3. The anti-clogging square drill pipe plug valve with built-in flushing channel according to claim 1, characterized in that: The valve core (2) has two sets of arc grooves (21) with an arc of 90 degrees in a circular array direction. The valve body (1) has two sets of limiting shafts (22) that can slide in the corresponding arc grooves (21).

4. The anti-clogging square drill pipe plug valve with built-in flushing channel according to claim 1, characterized in that: The sleeve (41) is fixedly installed with a separator (411) located inside the sleeve (41) at one end near the valve core (2), and the separator (411) at one end near the valve core (2) is in a close fit with the valve core (2).

5. The anti-clogging square drill pipe plug valve with built-in flushing channel according to claim 1, characterized in that: The sleeve (41) has an independent cavity (431) that can communicate with the corresponding upper cavity (43). An elastic locking rod (7) is movably installed on the top of the sleeve (41). One end of the elastic locking rod (7) can pass through the sleeve (41) and be inserted into the inner wall of the valve body (1). An elastic diaphragm (71) for isolating the independent cavity (431) from the upper cavity (43) is fixedly installed in the independent cavity (431). One end of the elastic locking rod (7) is fixedly connected to the elastic diaphragm (71).

6. The anti-clogging square drill pipe plug valve with built-in flushing channel according to claim 5, characterized in that: The diameter of the piston end of the hollow piston rod (53) is larger than the diameter of its rod body.

7. The anti-clogging square drill pipe plug valve with built-in flushing channel according to claim 1, characterized in that: The gas delivery assembly (6) includes a collar (61) movably sleeved on the outer periphery of the rod part of the valve core (2). A set of connecting pipes (62) are fixedly connected to the collar (61) in a symmetrical direction. The other end of the connecting pipes (62) is connected to the flow channel cylinder (51). The rod part of the valve core (2) has a columnar hole located inside the internal hexagonal hole. The valve core (2) has a through hole (23) that can communicate with the columnar hole. A spring combination valve core (63) that can initially block the through hole (23) is movably installed in the columnar hole. The spring combination valve core (63) has an annular groove (64). A gas delivery pipe (65) is fixedly connected to the collar (61). The gas delivery pipe (65) can be connected through the annular groove (64), the through hole (23) and the connecting pipe (62).

8. The anti-clogging square drill pipe plug valve with built-in flushing channel according to claim 7, characterized in that: The other end of the gas supply pipe (65) is connected to the gas pump, and a gas storage tank is provided between the end of the gas supply pipe (65) and the gas pump, and an exhaust valve is installed on the gas storage tank.

9. The anti-clogging square drill pipe plug valve with built-in flushing channel according to claim 1, characterized in that: The sleeve (41) has a vertical groove at the bottom of its outer periphery, and the inner wall of the flow channel cylinder (51) has a vertical ridge that can slide in the vertical groove.

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