An anti-torsion impact gas-liquid dual-drive PDC bit device

Abstract

The present invention discloses a torsion-resistant impact gas-liquid dual-drive PDC bit device, which includes a bit body, a drill tooth device, a channel, a spray hole, a debris treatment device, and a diversion device. The drill tooth device is arranged at the top edge of the bit body, the diversion device is arranged inside the bit body and close to the debris treatment device. One end of the connecting shaft passes through the spray hole and extends to the outside thereof. A crushing device is arranged at the top of the connecting shaft, a driving device is arranged at the bottom end of the connecting shaft. The bottom of the cone is fixedly connected to the top end of the connecting shaft. The horn-shaped crushing teeth are arranged on the surface of the cone, and the chopping teeth are arranged at the edge of the surface of the cone. The present invention relates to the technical field of geological drilling equipment. The torsion-resistant impact gas-liquid dual-drive PDC bit device achieves the effect of preventing debris adhesion, can timely process impurities such as sediment and cuttings generated by the bit, reduce the occurrence of adhesion, reduce wear, extend the service life of the equipment, and improve work efficiency and service performance.

Description

Technical Field

[0001] The present invention relates to the technical field of geological drilling equipment, and particularly to an anti-torsion impact gas-liquid dual-drive PDC bit device. Background Art

[0002] A PDC bit is a cutting bit that uses artificial polycrystalline diamond composite sheets as rock-breaking elements. The PDC bit is short for polycrystalline diamond composite sheet bit. It has high drilling efficiency and service life in soft to medium-hard homogeneous formations and is currently the main bit in the oil and gas drilling industry. With the continuous deepening of oil exploration and development, shallow and easily developable oil and gas resources are decreasing year by year. Seeking oil and gas resources under deep and complex formation conditions has become an important task in oil and gas exploration and development. The bit is one of the important tools for oil drilling. Whether the bit adapts to the rock properties and its quality plays a very important role in the selection of drilling techniques.

[0003] At present, the structure of the existing PDC bit is too simple. During the drilling process, a large amount of sediment, cuttings, and drilling fluid are mixed and adhered to the surface of the PDC bit, forming adhered debris deposition blocks that cannot be cleaned in time, making the bit not sharp enough and accelerating the wear of the bit, which is not conducive to drilling. At the same time, it will also cause blockage, making the drilling fluid difficult to discharge, affecting the overall work efficiency and reducing the service performance. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides an anti-torsion impact gas-liquid dual-drive PDC bit device, which solves the problems that the structure of the existing PDC bit is too simple. During the drilling process, a large amount of sediment, cuttings, and drilling fluid are mixed and adhered to the surface of the PDC bit, forming adhered debris deposition blocks that cannot be cleaned in time, making the bit not sharp enough and accelerating the wear of the bit, which is not conducive to drilling. At the same time, it will also cause blockage, making the drilling fluid difficult to discharge, affecting the overall work efficiency and reducing the service performance.

[0006] (2) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: An anti-torsion impact gas-liquid dual-drive PDC bit device, including a bit body, a drill tooth device, a channel, a spray hole, a debris treatment device, and a diversion device. The drill tooth device is arranged at the top edge of the bit body. The channel is opened at the central position inside the bit body. The spray hole is opened at the top surface of the bit body and close to the drill tooth device. The diversion device is arranged inside the bit body and close to the debris treatment device;

[0008] The debris treatment device is provided with a bracket, a connecting shaft, a crushing device, and a driving device. The end of the bracket is fixedly connected to the inside of the drill bit body. The connecting shaft is rotatably connected to the central position of the surface of the bracket. One end of the connecting shaft passes through the spray hole and extends to the outside thereof. The crushing device is arranged on the top of the connecting shaft, and the driving device is arranged at the bottom end of the connecting shaft;

[0009] The crushing device is provided with a cone, horn-shaped crushing teeth, and shredding teeth. The bottom of the cone is fixedly connected to the top end of the connecting shaft. The horn-shaped crushing teeth are arranged on the surface of the cone, and the shredding teeth are arranged at the edge of the surface of the cone. Under the transportation of the channel, the high-pressure drilling fluid drives the driving device, and then the connecting shaft drives the crushing device to rotate. At this time, the rotating horn-shaped crushing teeth and shredding teeth crush the debris adhered between two adjacent debris treatment devices, and the high-pressure drilling fluid ejected from the spray hole is used for re-flushing to reduce the occurrence of sticking, thereby reducing the wear amount. The driving force of the drilling fluid itself is fully utilized, the use of power is reduced, it is safe and reliable, and the use performance is improved.

[0010] Preferably, a connecting groove body is arranged at the bottom of the surface of the drill bit body, and an external thread is provided at the bottom end of the surface of the drill bit body and close to the connecting groove body. The whole device is connected through the external thread and reinforced through the rear connecting groove body, which can increase the anti-torsion impact, make the strength of itself high, and use the channel to transport the high-pressure drilling fluid and eject it from the spray hole. Utilizing the fluid pressure, the debris treatment device works to timely process the debris. The whole device can timely process impurities such as sediment and cuttings generated by the drill bit, reduce the occurrence of sticking, reduce the wear, ensure the sharpness of the drill bit, extend the service life of the equipment, and improve the working efficiency and use performance.

[0011] Preferably, the drill tooth device is evenly distributed on the top of the drill bit body. The end of the channel is communicated with the spray hole, and a cavity adapted to the crushing device and the driving device is provided inside the drill bit body.

[0012] Preferably, the drill tooth device is provided with a spiral convex, a plane, and drill cutting teeth. One side of the surface of the spiral convex is fixedly connected to the top of the drill bit body. The plane is arranged on one side of the surface of the spiral convex. The drill cutting teeth are arranged at the edge of the surface of the spiral convex and located at the position of the plane. After the whole is connected by using the external thread to form a preliminary fixation, and then re-connected through the connecting groove body, the anti-torsion performance of the main body is increased. At the same time, the surface of the spiral convex is in an arc-shaped arch, which further increases the anti-torsion impact, can perform high-strength drilling, is not easy to be damaged, is safe and reliable, and improves the use performance.

[0013] Preferably, the driving device is provided with a driving base body, curved blades, and a knocking device. The top end of the driving base body is fixedly connected to the bottom end of the connecting shaft. The surface edge of the curved blade is fixedly connected to the surface of the driving base body. The knocking device is arranged at the central position of the surface of the curved blade.

[0014] Preferably, the curved blades are evenly distributed on the surface of the driving base body, and the surface of the curved blade gradually increases from bottom to top.

[0015] Preferably, the knocking device is provided with a connecting column, an arc-shaped tension spring, and a solid knocking ball. One side of the surface of the connecting column is fixedly connected to the surface of the curved blade. One end of the arc-shaped tension spring is fixedly connected to the inside of the connecting column. One side of the surface of the solid knocking ball is fixedly connected to one end of the arc-shaped tension spring. The solid knocking ball is located at the end of the connecting column. When high-pressure drilling fluid is transported, the curved blade will be impacted, and the connecting shaft will be driven to rotate through the driving base body. At the same time, when rotating, under the action of centrifugal force, the solid knocking ball will be thrown out and stretch the arc-shaped tension spring. With continuous rotation, the solid knocking ball will knock on the arc-shaped deflector, causing it to vibrate, which is helpful for subsequent self-cleaning. The impact of high-pressure drilling fluid is fully utilized as the driving force, and the structures are connected together, realizing multiple functions, being safe and reliable, and improving the service performance.

[0016] Preferably, the guiding device is provided with a connecting hoop and an arc-shaped deflector. The surface of the connecting hoop is fixedly connected to the inside of the drill bit body. One side of the surface edge of the arc-shaped deflector is fixedly connected to the inner wall of the connecting hoop. The arc-shaped deflectors are evenly distributed on the inner wall of the connecting hoop. The arc-shaped deflectors evenly distributed on the inner wall of the connecting hoop are used to guide the drilling fluid, which further helps to impact the curved blade, thereby obtaining a greater impact force, helping to increase the driving force, making its rotation smooth. At the same time, the solid knocking ball thrown out under the action of centrifugal force during rotation knocks on the arc-shaped deflector, causing it to vibrate, and transmitting the vibration to the drill bit body, causing it to resonate, thereby shedding the debris attached to the surface and not easily sticking. Thus, self-cleaning is achieved. The structures are ingeniously connected together, being safe and reliable, and improving the service performance.

[0017] (III) Beneficial effects

[0018] The present invention provides an anti-torsion impact gas-liquid dual-drive PDC drill bit device, which has the following beneficial effects:

[0019] (1). The anti-torsion impact gas-liquid dual-drive PDC bit device connects the entire device through the bit body, drill tooth device, channel, spray hole, debris treatment device, diversion device, connection groove body, and external thread, and is reinforced through the rear connection groove body, which can increase the anti-torsion impact, making its own strength high. The high-pressure drilling fluid is transported through the channel and ejected from the spray hole. Using the fluid pressure, the debris treatment device works to timely process the debris. The entire device can timely process impurities such as sediment and cuttings generated by the bit, reduce the occurrence of sticking, reduce wear, ensure the sharpness of the bit, extend the service life of the equipment, and improve work efficiency and service performance.

[0020] (2). The anti-torsion impact gas-liquid dual-drive PDC bit device forms a preliminary fixation by connecting the whole through the external thread through the connection groove body, external thread, spiral body protrusion, plane, and cutting teeth, and is reconnected through the connection groove body, which increases the anti-torsion performance of the main body. At the same time, the surface of the spiral body protrusion is an arc-shaped arch, further increasing the anti-torsion impact, enabling high-strength drilling, not easily damaged, safe and reliable, and improving the service performance.

[0021] (3). The anti-torsion impact gas-liquid dual-drive PDC bit device, through the support, connecting shaft, crushing device, driving device, cone, horn crushing teeth, and chopping teeth, under the transportation of the channel, the high-pressure drilling fluid drives the driving device, and then the connecting shaft drives the crushing device to rotate. At this time, the rotating horn crushing teeth and chopping teeth crush the debris adhered between two adjacent debris treatment devices, and are rinsed again by the high-pressure drilling fluid ejected from the spray hole, reducing the occurrence of sticking, thereby reducing the wear amount, making full use of the driving force of its own drilling fluid, reducing the use of power, safe and reliable, and improving the service performance.

[0022] (4). The anti-torsion impact gas-liquid dual-drive PDC bit device, through the arc-shaped deflector, driving matrix, curved blades, knocking device, connecting column, arc-shaped tension spring, and solid knocking ball, when the high-pressure drilling fluid is transported, it will impact the curved blades, and the connecting shaft will be driven to rotate through the driving matrix. At the same time, when rotating, under the action of centrifugal force, the solid knocking ball is thrown out and stretches the arc-shaped tension spring. As it keeps rotating, the solid knocking ball will knock on the arc-shaped deflector, causing it to vibrate, which helps with subsequent self-cleaning, making full use of the impact of the high-pressure drilling fluid as the driving force, connecting the structures together, realizing multiple functions, safe and reliable, and improving the service performance.

[0023] (5). The anti-torsion impact gas-liquid dual-drive PDC bit device, through the connecting hoop and the arc-shaped deflector, utilizes the deflector of the arc-shaped deflector evenly distributed on the inner wall of the connecting hoop to deflect the drilling fluid, which further helps to impact the curved vane, thereby obtaining a greater impact force, helping to increase the driving force, making its rotation smooth. At the same time, the solid knocking ball thrown out by the centrifugal force during rotation knocks on the arc-shaped deflector, causing it to vibrate and transmit the vibration to the bit body, making it resonate, thereby shedding the debris attached to the surface and not easily sticking, thus realizing self-cleaning. The structure is ingeniously connected together, safe and reliable, and improves the service performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a schematic diagram of the internal structure of the present invention;

[0026] Figure 3 is a schematic diagram of the debris treatment device structure of the present invention;

[0027] Figure 4 is a schematic diagram of the crushing device structure of the present invention;

[0028] Figure 5 is a schematic diagram of the drill tooth device structure of the present invention;

[0029] Figure 6 is a schematic diagram of the driving device structure of the present invention;

[0030] Figure 7 is a schematic diagram of the knocking device structure of the present invention;

[0031] Figure 8 is a schematic diagram of the deflector device structure of the present invention.

[0032] In the figure: 1 bit body, 2 drill tooth device, 3 channel, 4 spray hole, 5 debris treatment device, 6 deflector device, 7 connecting groove body, 8 external thread, 21 spiral body protrusion, 22 plane, 23 drill cutting tooth, 51 support, 52 connecting shaft, 53 crushing device, 54 driving device, 531 cone, 532 horn crushing tooth, 533 chopping tooth, 541 driving base body, 542 curved vane, 543 knocking device, 5431 connecting column, 5432 arc-shaped tension spring, 5433 solid knocking ball, 61 connecting hoop, 62 arc-shaped deflector. DETAILED DESCRIPTION OF THE INVENTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0034] Embodiment 1:

[0035] Please refer to Figure 1-8 , the present invention provides a technical solution: an anti-torsion impact gas-liquid dual-drive PDC bit device, including a bit body 1, a drill tooth device 2, a channel 3, a spray hole 4, a debris treatment device 5, and a diversion device 6. The drill tooth device 2 is arranged at the top edge of the bit body 1. The channel 3 is opened at the central position inside the bit body 1. The spray hole 4 is opened at the top surface of the bit body 1 and close to the drill tooth device 2. The diversion device 6 is arranged inside the bit body 1 and close to the debris treatment device 5;

[0036] A connection groove body 7 is arranged at the bottom surface of the bit body 1. An external thread 8 is opened at the bottom end of the surface of the bit body 1 and close to the connection groove body 7. The whole device is connected through the external thread 8 and reinforced through the rear connection groove body 7, which can increase the anti-torsion impact, make its own strength high, and use the channel 3 to transport high-pressure drilling fluid and spray it out from the spray hole 4. Using the fluid pressure, the debris treatment device 5 works to timely process the debris. The whole device can timely process impurities such as sediment and cuttings generated by the bit, reduce the occurrence of sticking, reduce wear, ensure the sharpness of the bit, extend the service life of the equipment, and improve the working efficiency and service performance.

[0037] Embodiment 2:

[0038] The drill tooth device 2 is provided with a spiral body protrusion 21, a plane 22, and drill cutting teeth 23. One side of the surface of the spiral body protrusion 21 is fixedly connected to the top of the bit body 1. The plane 22 is opened on one side of the surface of the spiral body protrusion 21. The drill cutting teeth 23 are arranged at the edge of the surface of the spiral body protrusion 21 and located at the position of the plane 22. After the whole is connected by using the external thread 8, a preliminary fixation is formed, and it is connected again through the connection groove body 7, and the anti-torsion performance of the main body is increased. At the same time, the surface of the spiral body protrusion 21 is in an arc-shaped arch, further increasing the anti-torsion impact, and high-strength drilling can be carried out without being easily damaged.

[0039] Embodiment 3:

[0040] The debris treatment device 5 is provided with a bracket 51, a connecting shaft 52, a crushing device 53, and a driving device 54. The end of the bracket 51 is fixedly connected to the inside of the drill bit body 1. The connecting shaft 52 is rotatably connected to the central position of the surface of the bracket 51. One end of the connecting shaft 52 passes through the spray hole 4 and extends to its outside. The crushing device 53 is arranged on the top of the connecting shaft 52, and the driving device 54 is arranged at the bottom end of the connecting shaft 52;

[0041] The crushing device 53 is provided with a cone 531, horn-shaped crushing teeth 532, and shredding teeth 533. The bottom of the cone 531 is fixedly connected to the top end of the connecting shaft 52. The horn-shaped crushing teeth 532 are arranged on the surface of the cone 531, and the shredding teeth 533 are arranged on the edge of the surface of the cone 531. Under the transportation of the channel 3, the high-pressure drilling fluid drives the driving device 54, and then the connecting shaft 52 drives the crushing device 53 to rotate. At this time, the rotating horn-shaped crushing teeth 532 and shredding teeth 533 crush the debris adhered between two adjacent debris treatment devices 5, and the high-pressure drilling fluid ejected at the spray hole 4 is used for re-flushing to reduce the occurrence of sticking, thereby reducing the wear amount.

[0042] The driving device 54 is provided with a driving base 541, curved blades 542, and a knocking device 543. The top end of the driving base 541 is fixedly connected to the bottom end of the connecting shaft 52. The edge of the surface of the curved blade 542 is fixedly connected to the surface of the driving base 541. The knocking device 543 is arranged at the central position of the surface of the curved blade 542.

[0043] The knocking device 543 is provided with a connecting column 5431, an arc-shaped tension spring 5432, and a solid knocking ball 5433. One side of the surface of the connecting column 5431 is fixedly connected to the surface of the curved blade 542. One end of the arc-shaped tension spring 5432 is fixedly connected to the inside of the connecting column 5431. One side of the surface of the solid knocking ball 5433 is fixedly connected to one end of the arc-shaped tension spring 5432. The solid knocking ball 5433 is located at the end of the connecting column 5431. When the high-pressure drilling fluid is transported, it will impact the curved blade 542 and drive the connecting shaft 52 to rotate through the driving base 541. At the same time, during rotation, under the action of centrifugal force, the solid knocking ball 5433 is thrown out and stretches the arc-shaped tension spring 5432. As it rotates continuously, the solid knocking ball 5433 will knock on the arc-shaped guide plate 62 to make it vibrate, which is helpful for subsequent self-cleaning.

[0044] Case Four:

[0045] The diversion device 6 is provided with a connecting ferrule 61 and an arc-shaped diversion plate 62. The surface of the connecting ferrule 61 is fixedly connected to the inside of the drill bit body 1. One side of the surface edge of the arc-shaped diversion plate 62 is fixedly connected to the inner wall of the connecting ferrule 61. The arc-shaped diversion plates 62 are evenly distributed on the inner wall of the connecting ferrule 61. The arc-shaped diversion plates 62 evenly distributed on the inner wall of the connecting ferrule 61 are used to divert the drilling fluid, which further helps to impact the curved surface blades 542, thereby obtaining a greater impact force, helping to increase the driving force and making its rotation smooth. At the same time, the solid knocking balls 5433 thrown out by the centrifugal force during rotation knock on the arc-shaped diversion plates 62, causing them to vibrate and transmitting the vibration to the drill bit body 1 to form resonance, thereby shedding the debris attached to the surface and not easily sticking, thus realizing self-cleaning.

[0046] During use, the entire device is connected through the external thread 8 and reinforced through the rear connecting groove body 7. After connecting the whole through the external thread 8, a preliminary fixation is formed, and then it is connected again through the connecting groove body 7, which increases the anti-torsion performance of the main body. At the same time, the surface of the volute protrusion 21 is an arc-shaped arch, which further increases the anti-torsion impact. Under the transportation of the channel 3, the high-pressure drilling fluid drives the driving device 54, so that the connecting shaft 52 drives the crushing device 53 to rotate. At this time, the horn-shaped crushing teeth 532 and the chopping teeth 533 in rotation crush the debris adhered between two adjacent debris treatment devices 5, and are rinsed again by the high-pressure drilling fluid ejected from the spray holes 4. And when the high-pressure drilling fluid is transported, it will impact the curved surface blades 542 and drive the connecting shaft 52 to rotate through the driving base 541. At the same time, when rotating, under the action of centrifugal force, the solid knocking balls 5433 are thrown out and stretch the arc-shaped tension springs 5432. As the continuous rotation, the solid knocking balls 5433 will knock on the arc-shaped diversion plates 62, causing them to vibrate, which helps with subsequent self-cleaning. Moreover, the arc-shaped diversion plates 62 evenly distributed on the inner wall of the connecting ferrule 61 are used to divert the drilling fluid, which further helps to impact the curved surface blades 542, thereby obtaining a greater impact force, helping to increase the driving force and making its rotation smooth. At the same time, the solid knocking balls 5433 thrown out by the centrifugal force during rotation knock on the arc-shaped diversion plates 62, causing them to vibrate and transmitting the vibration to the drill bit body 1 to form resonance, thereby shedding the debris attached to the surface and not easily sticking, thus realizing self-cleaning. The structure is ingeniously connected together, safe and reliable, and improves the use performance.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A torsional impact resistant gas-liquid dual-drive PDC bit device, comprising a bit body (1), a cutting tooth device (2), a channel (3), a spray hole (4), a debris treatment device (5), and a diversion device (6), characterized in that: The described drill tooth device (2) is arranged at the top edge of the drill bit body (1), the channel (3) is opened at the central position inside the drill bit body (1), the spray hole (4) is opened at the top surface of the drill bit body (1) and close to the drill tooth device (2), and the diversion device (6) is arranged inside the drill bit body (1) and close to the debris treatment device (5); The debris treatment device (5) is provided with a bracket (51), a connecting shaft (52), a crushing device (53), and a driving device (54). The end of the bracket (51) is fixedly connected to the inside of the drill bit body (1). The connecting shaft (52) is rotatably connected to the central position on the surface of the bracket (51). One end of the connecting shaft (52) passes through the spray hole (4) and extends to its outside. The crushing device (53) is arranged on the top of the connecting shaft (52), and the driving device (54) is arranged at the bottom end of the connecting shaft (52); The crushing device (53) is provided with a cone (531), horn-shaped crushing teeth (532), and chopping teeth (533). The bottom of the cone (531) is fixedly connected to the top end of the connecting shaft (52). The horn-shaped crushing teeth (532) are arranged on the surface of the cone (531), and the chopping teeth (533) are arranged at the edge of the surface of the cone (531); The driving device (54) is provided with a driving base (541), curved surface blades (542), and a knocking device (543). The top end of the driving base (541) is fixedly connected to the bottom end of the connecting shaft (52). The edge of the surface of the curved surface blades (542) is fixedly connected to the surface of the driving base (541). The knocking device (543) is arranged at the central position on the surface of the curved surface blades (542); The knocking device (543) is provided with a connecting column (5431), an arc-shaped tension spring (5432), and a solid knocking ball (5433). One side of the surface of the connecting column (5431) is fixedly connected to the surface of the curved surface blades (542). One end of the arc-shaped tension spring (5432) is fixedly connected to the inside of the connecting column (5431). One side of the surface of the solid knocking ball (5433) is fixedly connected to one end of the arc-shaped tension spring (5432). The solid knocking ball (5433) is located at the end of the connecting column (5431).

2. The anti-torsion impact gas-liquid double-driven PDC bit device according to claim 1, wherein: A connecting groove body (7) is arranged at the bottom surface of the drill bit body (1), and an external thread (8) is opened at the bottom end of the drill bit body (1) and close to the connecting groove body (7).

3. The anti-torsion impact gas-liquid double-driven PDC bit device according to claim 1, characterized in that: The drill tooth devices (2) are evenly distributed on the top of the drill bit body (1). The end of the channel (3) is communicated with the spray hole (4). A cavity adapted to the crushing device (53) and the driving device (54) is opened inside the drill bit body (1).

4. The anti-torsion impact gas-liquid dual-drive PDC bit device according to claim 1, characterized in that: The drilling tooth device (2) is provided with a spiral body protrusion (21), a plane (22), and drilling and cutting teeth (23). One side of the surface of the spiral body protrusion (21) is fixedly connected to the top of the drill bit body (1). The plane (22) is formed on one side of the surface of the spiral body protrusion (21). The drilling and cutting teeth (23) are arranged at the edge of the surface of the spiral body protrusion (21) and are located at the position of the plane (22).

5. The anti-torsion impact gas-liquid dual-drive PDC bit device according to claim 1, wherein: The curved surface blades (542) are evenly distributed on the surface of the driving base body (541), and the surface of the curved surface blades (542) gradually increases from bottom to top.

6. The anti-torsion impact gas-liquid double-drive PDC bit device according to claim 1, wherein: The flow guiding device (6) is provided with a connecting hoop (61) and an arc-shaped flow guiding plate (62). The surface of the connecting hoop (61) is fixedly connected to the inside of the drill bit body (1). One side of the edge of the surface of the arc-shaped flow guiding plate (62) is fixedly connected to the inner wall of the connecting hoop (61). The arc-shaped flow guiding plates (62) are evenly distributed on the inner wall of the connecting hoop (61).

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