Turbodrill with floating ring

Abstract

The invention provides a turbine drill with a floating ring. The turbine drill comprises a drill shell and a floating ring assembly. A rotating shaft is arranged in the drilling tool shell, the rotating shaft is sleeved with a turbine rotor, a turbine stator is arranged in the drilling tool shell, and the turbine rotor is sleeved with the turbine stator; the floating ring assembly is disposed between the turbine stator and the turbine rotor. By arranging the floating ring assembly, the floating ring can achieve the effect of blocking the gap between the turbine rotor and the turbine stator, the gap is blocked on the premise that normal use of the turbine drill is guaranteed, drilling fluid is prevented from flowing out of the gap, the volume efficiency of the drilling fluid is increased compared with the volume efficiency of the drilling fluid before the floating ring assembly is arranged, and the drilling efficiency is improved. By arranging the different floating ring assemblies, the turbine drill can achieve blocking of the radial clearance in different modes, and then it is guaranteed that the turbine drill can meet different actual requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of turbine drill, in particular to a turbine drill with floating ring. BACKGROUND

[0002] The turbine drill is a kind of drill, which is a kind of hole bottom power machine that converts the kinetic energy of flushing fluid into mechanical energy, and is referred to as turbine drill, when in use, drilling fluid passes through the stator and rotor of turbine drill under high pressure, the stator plays a guiding role to guide high-pressure fluid to the rotor, and push the rotor to rotate, the rotor is connected with turbine shaft, so as to transmit the rotating force to the turbine shaft, and provide rotating power for the drill bit.

[0003] In the existing structure, there is a radial gap between the rotor and the stator, and appropriate radial gap can ensure smooth flow of fluid between the rotor and the stator, reduce the amount of fluid leakage, and thus improve the volumetric efficiency of the turbine drill. If the radial gap is too large, it will lead to unstable flow of fluid between the rotor and the stator, increase the flow loss, and thus reduce the overall efficiency of the system. If the gap is designed to be too small, the assembly may be unstable due to manufacturing errors, which may increase the friction between the rotor and the cylinder wall, and thus aggravate the wear. The existing high-speed turbine drill may cause leakage in the radial gap inside the drill during operation due to the high pressure and flow rate of the drilling fluid, which may reduce the volumetric efficiency of the drill, and therefore a turbine drill with floating ring is proposed. SUMMARY

[0004] The main purpose of the present application is to provide a turbine drill with floating ring, which solves the problem of reduced volumetric efficiency caused by excessive radial gap between the rotor and the stator, and effectively seals the gap by setting the floating ring assembly, thereby improving the volumetric efficiency and working stability of the turbine drill.

[0005] To solve the above technical problems, the technical solution adopted by the present application is as follows: a turbine drill with floating ring, comprising a drill housing and a floating ring assembly. The inside of the drill housing is provided with a rotating shaft, the outside of the rotating shaft is provided with a turbine rotor, the inside of the drill housing is provided with a turbine stator, and the turbine stator is sleeved outside the turbine rotor. The floating ring assembly is arranged between the turbine stator and the turbine rotor.

[0006] In the preferred scheme, the turbine rotor comprises a hollow cylinder, the outside of the hollow cylinder is provided with an annular frame, the turbine fan blades are arranged between the annular frame and the hollow cylinder, and there is a gap between the annular frame and the inner wall of the turbine stator.

[0007] In a preferred scheme, the floating ring assembly comprises a first floating ring, the bottom end of the annular frame is sequentially provided with a first connecting piece and a first bottom cover from top to bottom, a first floating ring is arranged between the first connecting piece and the first bottom cover, the first connecting piece comprises a connecting barrel, the outer part of the connecting barrel is sleeved with a fixed ring, the first bottom cover comprises an annular cover, and the upper surface of the annular cover is provided with a positioning annular groove.

[0008] In a preferred scheme, the first floating ring comprises a first main ring body arranged between the turbine stator and the connecting barrel, the side of the first main ring body facing the connecting barrel is provided with a first clamping ring extending between the fixed ring and the annular cover, the side of the first main ring body away from the first connecting piece is provided with a secondary ring body located below the turbine stator, and the lower surface of the first main ring body is provided with a positioning ring extending into the inside of the positioning annular groove.

[0009] In a preferred scheme, the floating ring assembly comprises a movable ring, the bottom end of the annular frame is sequentially provided with a second connecting piece and a water guide ring from top to bottom, the outer part of the second connecting piece is sleeved with a movable ring, the inner diameter of the movable ring is greater than the outer diameter of the second connecting piece, the movable ring comprises an annular plate, the upper surface of the annular plate is provided with a plurality of water permeable holes, and the water permeable holes are annularly and equidistantly distributed.

[0010] In a preferred scheme, the water guide ring comprises a water guide ring main body, the vertical section of the water guide ring main body is a U-shaped section with an opening upward, the bottom end of the second connecting piece is provided with a center ring extending into the inside of the water guide ring main body, a plurality of connecting plates are arranged between the center ring and the inner wall of the water guide ring main body, a communication hole is arranged between adjacent two connecting plates, the upper surface of the water guide ring main body is provided with a first sealing groove located below the turbine stator, the inside of the first sealing groove is provided with a first O-shaped sealing ring in contact with the lower surface of the turbine stator, and part of the opening of the U-shaped section is located on the side of the second connecting piece away from the movable ring, that is, part of the opening is arranged between the second connecting piece and the inner wall of the water guide ring main body.

[0011] In a preferred scheme, the floating ring assembly comprises a second floating ring and a supporting ring, the bottom end of the annular frame is sequentially provided with a first connecting piece and a second bottom cover from top to bottom, the first connecting piece comprises a connecting barrel, the outer part of the connecting barrel is sleeved with a fixed ring, and the fixed ring and the second bottom cover are sequentially provided with a second floating ring and a supporting ring from top to bottom.

[0012] In the preferred solution, the second floating ring comprises a second main ring body sleeved outside the fixed ring, the second main ring body is provided with a second clamping ring below the fixed ring towards the first connecting piece, the lower surface of the second main ring body is provided with a stress groove, the side of the stress groove away from the first connecting piece is an inclined surface, the support ring comprises a support ring ring body arranged between the second clamping ring and the second bottom cover, the side of the support ring ring body towards the turbine stator is provided with a second sealing groove, the inside of the second sealing groove is provided with a second O-shaped sealing ring closely fitted with the inner wall of the turbine stator, the support ring ring body extends to the inside of the stress groove, and the surface in contact with the inclined surface is also an inclined surface.

[0013] In the preferred solution, the floating ring assembly comprises a second connecting piece, a third floating ring and an outer ring support arranged in sequence from top to bottom at the bottom end of the annular frame, the third floating ring comprises a third main ring body, the upper surface of the third main ring body is provided with a first mounting groove, the second connecting piece extends to the inside of the first mounting groove, the side of the third main ring body away from the turbine stator is provided with a water collecting outer ring, the third main ring body towards the turbine stator is provided with a third sealing groove, the inside of the third sealing groove is provided with a third O-shaped sealing ring with an outer ring closely fitted with the inner wall of the turbine stator, the inner diameter of the top of the water collecting outer ring is greater than the inner diameter of the bottom, the outer ring support comprises a hollow outer ring arranged at the bottom end of the third main ring body, the inner circle surface of the hollow outer ring is provided with a first inverted circular table through hole closely fitted with the water collecting outer ring.

[0014] In the preferred solution, the bottom end of the hollow cylinder is sequentially provided with a fourth floating ring and an inner ring support from top to bottom, the fourth floating ring comprises a connecting ring arranged at the bottom end of the hollow cylinder, the side of the connecting ring towards the turbine stator is provided with a water collecting inner ring, the inner diameter of the top of the water collecting inner ring is greater than the inner diameter of the bottom, the inner ring support comprises a hollow inner ring arranged at the bottom end of the connecting ring, the inner circle surface of the hollow inner ring is provided with a second inverted circular table through hole closely fitted with the water collecting inner ring.

[0015] The present application provides a floating ring turbine drill, by adopting the above scheme, has the following beneficial effects: 1、The floating ring assembly is arranged, so that the floating ring can block the gap between the turbine rotor and the turbine stator, block the gap under the premise of ensuring the normal use of the turbine drill, prevent the drilling fluid from flowing out of the gap, and increase the volume efficiency of the drilling fluid relative to the state before the floating ring assembly is not arranged; 2、By arranging different floating ring assemblies, the device can be applied to different actual needs, wherein: the first floating ring avoids the flow of drilling fluid from the gap to the lower side of the turbine stator through plugging; The water guide ring guides part of the drilling fluid to move upward and impact the drilling fluid flowing downward from the gap, thereby achieving a dynamic plugging effect; The second floating ring is pressed by the drilling fluid flowing from the gap, and the second floating ring and the support ring are pressed against each other, so that the second floating ring can elastically deform and tightly fit the inner wall of the turbine stator, thereby automatically adapting to wear and tear and having a longer service life; The third floating ring and the fourth floating ring cooperate with each other to make the drilling fluid flowing from the turbine stator fan blade gather and flow directionally, so that the drilling fluid is limited to flow within a certain range, and the third O-shaped sealing ring is arranged to avoid the drilling fluid flowing from the gap to the lower part of the turbine stator. BRIEF DESCRIPTION OF DRAWINGS

[0016] The application will be further described below in combination with the drawings and examples: Figure 1 A structure schematic diagram of a turbine drilling tool with a floating ring provided for an embodiment of the application; Figure 2 A structure sectional view of the turbine drilling tool with the floating ring; Figure 1 Figure 3 A structure schematic diagram of a floating ring of an embodiment of the application; Figure 4 A local enlarged schematic diagram of an A area in the floating ring; Figure 3 A structure schematic diagram of the floating ring from another perspective; Figure 5 Figure 4 A local enlarged schematic diagram of a B area in the floating ring; Figure 6 A structure schematic diagram of the floating ring from another perspective; Figure 5 A local enlarged schematic diagram of a C area in the floating ring; Figure 7 A structure schematic diagram of a floating ring of an embodiment of the application; Figure 8 Figure 7 A local enlarged schematic diagram of a D area in the floating ring; Figure 9 A structure schematic diagram of the floating ring from another perspective; Figure 8 A local enlarged schematic diagram of an E area in the floating ring; Figure 10 Figure 9 A structure schematic diagram of a floating ring of an embodiment of the application; Figure 11 A local enlarged schematic diagram of a F area in the floating ring; Figure 12 A structure schematic diagram of the floating ring from another perspective; Figure 11 A local enlarged schematic diagram of a G area in the floating ring; Figure 13 Figure 12 A structure schematic diagram of the floating ring from another perspective;​​​​​ Figure 14 For Figure 13 the local enlarged view of region F; Figure 15 For the structure schematic diagram of the fourth embodiment of the application; Figure 16 For Figure 15 the local enlarged view of region G; Figure 17 For Figure 15 the local enlarged view of region H; Figure 18 For Figure 15 the structure schematic diagram of another view; Figure 19 For Figure 18 the local enlarged view of region I; Figure 20 For Figure 19 the local enlarged view of region M; In the figure: 1, drill tool shell; 2, rotating shaft; 3, turbine stator; 4, turbine rotor; 41, hollow cylinder; 42, annular frame; 43, turbine blade; 5, first connecting piece; 51, connecting cylinder; 52, fixed ring; 6, first floating ring; 61, first main ring body; 62, secondary ring body; 63, first clamping ring; 64, positioning ring; 7, first bottom cover; 71, annular cover; 72, positioning annular groove; 8, second connecting piece; 9, water guide ring; 91, water guide ring body; 92, center ring; 93, connecting plate; 94, first sealing groove; 95, first O-shaped sealing ring; 10, movable ring; 101, annular plate; 102, water permeable hole; 11, second bottom cover; 12, second floating ring; 121, second main ring body; 122, stress groove; 123, second clamping ring; 13, support ring; 131, support ring body; 132, second sealing groove; 133, second O-shaped sealing ring; 14, third floating ring; 141, third main ring body; 142, first mounting groove; 143, third sealing groove; 144, third O-shaped sealing ring; 145, water collection outer ring; 15, outer ring support; 151, hollow outer ring; 152, first inverted circular platform through hole; 16, fourth floating ring; 161, connecting ring; 162, water collection inner ring; 17, inner ring support; 171, hollow inner ring; 172, second inverted circular platform through hole. DETAILED DESCRIPTION

[0017] Example 1: As Figures 1-3 shown, a turbine drill tool with a floating ring: including a drill tool shell 1 and a floating ring assembly; The inside of the drill tool shell 1 is provided with a rotating shaft 2, the outside of the rotating shaft 2 is sleeved with a turbine rotor 4, the inside of the drill tool shell 1 is provided with a turbine stator 3, and the turbine stator 3 is sleeved outside the turbine rotor 4; The turbine rotor 4 comprises a hollow cylinder 41, the outside of the hollow cylinder 41 is sleeved with an annular frame 42, turbine blades 43 are arranged between the annular frame 42 and the hollow cylinder 41, and a gap exists between the annular frame 42 and the inner wall of the turbine stator 3. Based on the above, the drill tool shell 1, the rotating shaft 2, the turbine stator 3 and the turbine rotor 4 are all prior art, so their specific structures are not described here. Since the technical point of this scheme is the floating ring assembly, the other structures inside the drill tool are also not described here. The hollow cylinder 41 and the annular frame 42 are provided to facilitate the description of the floating ring assembly.

[0018] As shown in Figures 3-6 The floating ring assembly is arranged between the turbine stator 3 and the turbine rotor 4. The floating ring assembly comprises a first floating ring 6, the bottom end of the annular frame 42 is sequentially provided with a first connecting piece 5 and a first bottom cover 7 from top to bottom, the first connecting piece 5 and the first bottom cover 7 are provided with the first floating ring 6 therebetween, the first connecting piece 5 comprises a connecting cylinder 51, the outside of the connecting cylinder 51 is sleeved with a fixed ring 52, the first bottom cover 7 comprises an annular cover 71, and the upper surface of the annular cover 71 is provided with a positioning annular groove 72. The first floating ring 6 comprises a first main ring body 61 arranged between the turbine stator 3 and the connecting cylinder 51, one side of the first main ring body 61 facing the connecting cylinder 51 is provided with a first clamping ring 63 extending between the fixed ring 52 and the annular cover 71, the other side of the first main ring body 61 away from the first connecting piece 5 is provided with a secondary ring body 62 located below the turbine stator 3, and the lower surface of the first main ring body 61 is provided with a positioning ring 64 extending into the inside of the positioning annular groove 72. Based on the above, the first connecting piece 5 and the first bottom cover 7 cooperate with each other to fix the first floating ring 6. Here, the first floating ring 6 is preferably made of a polytetrafluoroethylene material. The first main ring body 61 contacts the inner wall of the turbine stator 3 to achieve primary sealing, and the secondary ring body 62 is arranged to achieve secondary sealing. When the first floating ring 6 rotates with the turbine rotor 4, the drilling fluid can be prevented from flowing out from the gap between the turbine rotor 4 and the turbine stator 3.

[0019] Embodiment two: As shown in Figures 7-10As shown, the floating ring assembly includes a movable ring 10. The bottom end of the annular frame 42 is provided with a second connector 8 and a water guide ring 9 from top to bottom. The movable ring 10 is sleeved on the outside of the second connector 8. The inner diameter of the movable ring 10 is larger than the outer diameter of the second connector 8. The movable ring 10 includes an annular plate 101. The upper surface of the annular plate 101 is provided with a plurality of water-permeable holes 102. The water-permeable holes 102 are distributed in an annular shape at equal intervals. The water guide ring 9 includes a water guide ring body 91. The vertical cross-section of the water guide ring body 91 is a U-shaped cross-section with the opening facing upwards. The bottom end of the second connector 8 is provided with a central ring 92 extending into the interior of the water guide ring body 91. A plurality of connecting plates 93 are provided between the central ring 92 and the inner wall of the water guide ring body 91. A connecting hole is provided between two adjacent connecting plates 93. The upper surface of the water guide ring body 91 is provided with a first sealing groove 94 located below the turbine stator 3. The interior of the first sealing groove 94 is provided with a first O-ring sealing ring 95 that contacts the lower surface of the turbine stator 3. Part of the opening of the U-shaped cross-section is located on the side of the second connector 8 away from the movable ring 10, that is, a partial opening is provided between the second connector 8 and the inner wall of the water guide ring body 91. Based on the above, this embodiment uses a different floating ring assembly compared to embodiment one. By installing the water guide ring 9 at the bottom of the annular frame 42, after the turbine mover 4 is impacted by the drilling fluid, the drilling fluid continues to flow downward from the turbine fan blade 43. The downward-flowing portion of the drilling fluid enters the interior of the water guide ring 9 through the opening and flows along the gap between the water guide ring body 91 and the central ring 92 before flowing out from the other end of the water guide ring body 91. The outflowing drilling fluid flows upward into the gap between the turbine stator 3 and the turbine mover 4, and pushes the movable ring 10 upward. During this process, the drilling fluid flowing downward from the gap is impacted upward, thus hindering the downward flow of the drilling fluid along the gap. The movable ring 10 acts as a buffer.

[0020] Example 3: like Figures 11-14 As shown, the floating ring assembly includes a second floating ring 12 and a support ring 13. The bottom end of the annular frame 42 is provided with a first connector 5 and a second bottom cover 11 from top to bottom. The first connector 5 includes a connecting cylinder 51. A fixing ring 52 is sleeved on the outside of the connecting cylinder 51. The second floating ring 12 and the support ring 13 are provided between the fixing ring 52 and the second bottom cover 11 from top to bottom. The second floating ring 12 includes a second main ring body 121 sleeved outside the fixed ring 52. The second main ring body 121 is provided with a second snap ring 123 located directly below the fixed ring 52, facing the first connector 5. The lower surface of the second main ring body 121 is provided with a force groove 122. The side of the force groove 122 away from the first connector 5 is an inclined surface. The support ring 13 includes a support ring body 131 disposed between the second snap ring 123 and the second bottom cover 11. The side of the support ring body 131 facing the turbine stator 3 is provided with a second sealing groove 132. The interior of the second sealing groove 132 is provided with a second O-ring sealing ring 133 that fits tightly against the inner wall of the turbine stator 3. The support ring body (131) extends into the interior of the force groove 122, and the surface in contact with the inclined surface is also an inclined surface. Based on the above, different floating ring assemblies are used on the basis of Embodiment 1. By setting the support ring 13, on the one hand, the support ring 13 and the second O-ring 133 cooperate with each other to achieve a first-level seal, and on the other hand, the support ring 13 supports the second floating ring 12, so that the second floating ring 12 can withstand relatively large pressure. Furthermore, when the second floating ring 12 is under the action of medium pressure, it ensures that there is a mutual squeezing force between the second floating ring 12 and the support ring 13. At this time, the force groove 122 and the support ring body 131 are in contact with each other, and the contact surfaces are inclined. Therefore, when subjected to medium pressure, the second floating ring 12 is subjected to a lateral component force, which in turn makes the second floating ring 12 fit more tightly with the inner wall of the turbine stator 3 under the action of the lateral component force, thus achieving a better sealing effect.

[0021] Example 4: like Figures 15-20 As shown, the floating ring assembly includes a second connector 8, a third floating ring 14, and an outer ring support 15, which are sequentially arranged from top to bottom at the bottom of the annular frame 42. The third floating ring 14 includes a third main ring body 141, and a first mounting groove 142 is provided on the upper surface of the third main ring body 141. The second connector 8 extends into the interior of the first mounting groove 142. A water collecting outer ring 145 is provided on the side of the third main ring body 141 facing away from the turbine stator 3. A third sealing groove 143 is provided for the turbine stator 3. A third O-ring 144 is provided inside the third sealing groove 143, and its outer ring is tightly fitted with the inner wall of the turbine stator 3. The inner diameter of the top of the water collecting outer ring 145 is larger than the inner diameter of its bottom. The outer ring support 15 includes a hollow outer ring 151 provided at the bottom end of the third main ring body 141. The inner ring surface of the hollow outer ring 151 is provided with a first inverted frustum through hole 152 that is tightly fitted with the water collecting outer ring 145. The bottom end of the hollow cylinder 41 is sequentially provided from top to bottom with a fourth floating ring 16 and an inner ring support 17, the fourth floating ring 16 comprises a connecting ring 161 arranged at the bottom end of the hollow cylinder 41, and a water collecting inner ring 162 is arranged on one side of the connecting ring 161 towards the turbine stator 3, the inner diameter of the top of the water collecting inner ring 162 is larger than the inner diameter of the bottom, and the inner ring support 17 comprises a hollow inner ring 171 arranged at the bottom end of the connecting ring 161, and a second inverted circular table through hole 172 is arranged on the inner ring surface of the hollow inner ring 171 and closely contacts the water collecting inner ring 162; Based on the above, on the basis of embodiment one, different floating ring assemblies are used, by arranging the third floating ring 14 and the fourth floating ring 16, and under the cooperation of the water collecting outer ring 145 and the water collecting inner ring 162, the drilling fluid in contact with the turbine fan blade 43 flows to the drilling fluid below the turbine rotor 4, and is gathered together under the action of the two water collecting inner rings 145 and the water collecting outer rings 162, at this time, the flowing liquid forms a flow along the annular channel, and since the width of the annular channel is smaller than the length of the turbine fan blade 43, it is ensured that the drilling fluid flows directly into the next turbine stator 3 as much as possible, that is, the condition of radial diffusion of the drilling fluid is reduced, and at the same time, the third O-shaped sealing ring 144 also plays a plugging role, further avoiding the possibility of the drilling fluid flowing out from the gap.

[0022] The present application realizes leakage control through a multi-level floating ring sealing system, which includes four types of innovative floating ring assemblies, and the structural characteristics and action mechanisms thereof are as follows: I. First floating ring (static plugging type): Structural characteristics: A double-ring body composite structure is adopted, including a first main ring body 61 in contact with the inner wall of the turbine stator 3 and a secondary ring body 62 below the turbine stator 3; The first main ring body 61 extends out a first clamping ring 63 towards one side of the turbine rotor 3, the first clamping ring 63 is embedded between the fixed ring 52 and the annular cover 71, and mechanical limiting is formed; A positioning ring 64 is arranged on the lower surface of the first main ring body 61, and cooperates with the positioning annular groove 72 of the first bottom cover 7 (cooperation tolerance H8 / g7), so as to ensure the axial positioning accuracy; The material is preferably polytetrafluoroethylene filled with 20% carbon fiber (PTFE-CF20), and the surface roughness Ra is ≤0.8 μm.

[0023] Action mechanism: Primary mechanical seal: the first main ring body 61 forms radial contact with the inner wall of the turbine stator 3, directly plugging the gap (the designed gap between the first main ring body 61 and the inner wall of the turbine stator 3 is between 0.1-0.2 mm); Secondary fluid damping: the secondary ring body 62 forms a labyrinth flow channel below the turbine stator 3, reducing the leakage flow rate by extending the fluid path.

[0024] II. Movable ring 10 + water guide ring 9 (dynamic hedging type): Structural features: The water guide ring body 91 adopts a U-shaped section with the opening upward, and the bottom of the second connecting piece 8 is provided with a center ring 92 extending into the opening. The center ring 92 is connected with the inner wall of the water guide ring 9 through a connecting plate 93, and a fluid passage is formed between adjacent two connecting plates 93. The movable ring 10 is a ring-shaped plate structure with an inner diameter larger than the outer diameter of the second connecting piece 8 by 0.5-1 mm. The upper surface is provided with ring-shaped equidistant water-permeable holes 102 (hole diameter Φ2-5 mm, number 12-24). The upper surface of the water guide ring 9 is provided with a first sealing groove 94, and a first O-shaped sealing ring 95 (compression rate between 15%-20%) is arranged in the first sealing groove 94. The first O-shaped sealing ring 95 is tightly attached to the lower surface of the turbine stator 3.

[0025] Mechanism of action: Fluid hedging control: part of the drilling fluid enters from the opening of the water guide ring 9, flows through the gap between the center ring 92 and the water guide ring 9, and is sprayed upward. Part of the drilling fluid directly contacts through the water-permeable holes 102, and the other part of the drilling fluid indirectly contacts through the movable ring 10, thereby impacting the fluid leaking downward from the gap between the turbine rotor 3 and the stator, forming dynamic pressure balance. Buffering and damping: the gap between the movable ring 10 and the second connecting piece 8 allows it to float axially with a small amplitude, relieving the vibration caused by fluid impact, and the movable ring 10 itself can also play a buffering role.

[0026] III. Second floating ring 12 + support ring 13 (self-adaptive compression type): Structural features: The second floating ring 12 includes a second main ring body 121 sleeved outside the fixed ring 52, and the lower surface of the second main ring body 121 is provided with a stress groove 122. One side of the stress groove 122 is an inclined surface (inclination angle 15°-30°), and the other side extends out a second clamping ring 123 fixed below the fixed ring 52. The support ring 13 is arranged between the second floating ring 12 and the second bottom cover 11, and the side of the support ring 13 facing the turbine stator 3 is provided with a second sealing groove 132. A second O-shaped sealing ring 133 (compression rate between 18%-22%) is arranged in the second sealing groove 132. The upper end of the support ring 13 extends into the stress groove 122, and the contact surface in contact with the inclined surface is an inclined surface with the same angle, forming a wedge-shaped fitting structure.

[0027] Mechanism of action: Pressure-driven sealing: when drilling fluid leaks from the gap, the medium pressure acts on the lower surface of the second floating ring 12, pushing it to expand radially along the inclined surface, so that the second main ring body 121 tightly fits the inner wall of the turbine stator 3; Wear self-adaptation: the inclined surface component can automatically compensate for the wear of the floating ring, maintaining the sealing contact pressure (contact stress ≥ 2.5 MPa).

[0028] Four, third floating ring 14 + fourth floating ring 16 (poly-flow guide type): Structural features: The upper surface of the third main ring body 141 of the third floating ring 14 is provided with a first installation groove 142, which is in interference fit (fitting tolerance H7 / s6) with the second connecting piece 8, and the side away from the turbine stator 3 is provided with a water collecting outer ring 145, and the inner diameter of the top is larger than that of the bottom (taper 1:2-1:3); The hollow outer ring 151 of the outer ring support 15 is provided with a first inverted circular platform through hole 152 in the inner circle, which tightly fits the tapered surface of the water collecting outer ring 145 (fitting clearance ≤0.05mm); The connecting ring 161 of the fourth floating ring 16 is provided with a water collecting inner ring 162 (symmetrical structure with the water collecting outer ring 145), which is matched with the second inverted circular platform through hole 172 of the inner ring support 17, forming a double-tapered poly-flow channel.

[0029] Mechanism of action: Leakage fluid collection: the inverted circular platform structure of the water collecting outer ring 145 and the water collecting inner ring 162 guides the leakage fluid to the center, reducing the radial diffusion (flow rate reduced by 40%-60%); Directional flow control: the gathered fluid forms a high-speed jet through the first and second inverted circular platform through holes 172, which is directly introduced into the flow passage of the next stage turbine stator 3, reducing energy loss.

[0030] The above structure realizes the improvement of dynamic sealing performance under high pressure (≤150MPa) and high speed (≤5000r / min) working conditions through material optimization (friction coefficient ≤0.15), surface treatment (nanometer coating thickness 2-5μm) and assembly process (hot assembly temperature 80℃-120℃).

[0031] The above embodiments are only preferred technical solutions of the present application, and should not be regarded as limitations of the present application. The protection scope of the present application should be based on the technical solutions claimed in the claims, including equivalent replacement solutions of the technical features claimed in the claims. That is, within this range, equivalent replacement improvements are also within the protection scope of the present application.

Claims

1. A turbine drill bit with a floating ring, characterized in that: Includes drill string housing (1) and floating ring assembly; The drill housing (1) is provided with a rotating shaft (2) inside, and a turbine mover (4) is sleeved on the outside of the rotating shaft (2). The drill housing (1) is provided with a turbine stator (3) inside, and the turbine stator (3) is sleeved on the outside of the turbine mover (4). The floating ring assembly is positioned between the turbine stator (3) and the turbine mover (4).

2. The turbine drill bit with floating ring according to claim 1, characterized in that: The turbine mover (4) includes a hollow cylinder (41), an annular frame (42) is fitted on the outside of the hollow cylinder (41), a turbine fan blade (43) is provided between the annular frame (42) and the hollow cylinder (41), and there is a gap between the annular frame (42) and the inner wall of the turbine stator (3).

3. A turbine drill bit with a floating ring according to claim 2, characterized in that: The floating ring assembly includes a first floating ring (6). The bottom end of the annular frame (42) is provided with a first connector (5) and a first bottom cover (7) from top to bottom. The first floating ring (6) is provided between the first connector (5) and the first bottom cover (7). The first connector (5) includes a connecting cylinder (51). A fixing ring (52) is sleeved on the outside of the connecting cylinder (51). The first bottom cover (7) includes an annular cover (71). A positioning annular groove (72) is provided on the upper surface of the annular cover (71).

4. A turbine drill bit with a floating ring according to claim 3, characterized in that: The first floating ring (6) includes a first main ring body (61) disposed between the turbine stator (3) and the connecting cylinder (51). The first main ring body (61) has a first snap ring (63) extending between the fixing ring (52) and the annular cover (71) on the side facing the connecting cylinder (51). The first main ring body (61) has a secondary ring body (62) located below the turbine stator (3) on the side away from the first connecting member (5). The lower surface of the first main ring body (61) has a positioning ring (64) extending into the positioning annular groove (72).

5. A turbine drill bit with a floating ring according to claim 2, characterized in that: The floating ring assembly includes a movable ring (10). The bottom end of the annular frame (42) is provided with a second connector (8) and a water guide ring (9) from top to bottom. The movable ring (10) is sleeved on the outside of the second connector (8). The inner diameter of the movable ring (10) is larger than the outer diameter of the second connector (8). The movable ring (10) includes an annular plate (101). The upper surface of the annular plate (101) is provided with a plurality of water-permeable holes (102). The water-permeable holes (102) are distributed in an annular shape at equal intervals.

6. A turbine drill bit with a floating ring according to claim 5, characterized in that: The water guide ring (9) includes a water guide ring body (91). The vertical cross section of the water guide ring body (91) is a U-shaped cross section with the opening facing upwards. The bottom end of the second connector (8) is provided with a central ring (92) extending into the interior of the water guide ring body (91). Multiple connecting plates (93) are provided between the central ring (92) and the inner wall of the water guide ring body (91). A connecting hole is provided between two adjacent connecting plates (93). The upper surface of the water guide ring body (91) is provided with a first sealing groove (94) located below the turbine stator (3). The interior of the first sealing groove (94) is provided with a first O-ring sealing ring (95) that contacts the lower surface of the turbine stator (3). Part of the opening of the U-shaped cross section is located on the side of the second connector (8) away from the movable ring (10), that is, a partial opening is provided between the second connector (8) and the inner wall of the water guide ring body (91).

7. A turbine drill bit with a floating ring according to claim 2, characterized in that: The floating ring assembly includes a second floating ring (12) and a support ring (13). The bottom end of the annular frame (42) is provided with a first connector (5) and a second bottom cover (11) from top to bottom. The first connector (5) includes a connecting cylinder (51). A fixing ring (52) is sleeved on the outside of the connecting cylinder (51). The second floating ring (12) and the support ring (13) are provided between the fixing ring (52) and the second bottom cover (11) from top to bottom.

8. A turbine drill bit with a floating ring according to claim 7, characterized in that: The second floating ring (12) includes a second main ring body (121) sleeved outside the fixed ring (52). The second main ring body (121) is provided with a second snap ring (123) located directly below the fixed ring (52) facing the first connector (5). The lower surface of the second main ring body (121) is provided with a force groove (122). The side of the force groove (122) away from the first connector (5) is an inclined surface. The support ring (13) includes a support ring body (131) disposed between the second snap ring (123) and the second bottom cover (11). The side of the support ring body (131) facing the turbine stator (3) is provided with a second sealing groove (132). The interior of the second sealing groove (132) is provided with a second O-ring sealing ring (133) that fits tightly against the inner wall of the turbine stator (3). The support ring body (131) extends into the interior of the force groove (122), and the surface in contact with the inclined surface is also an inclined surface.

9. A turbine drill bit with a floating ring according to claim 2, characterized in that: The floating ring assembly includes a second connector (8), a third floating ring (14), and an outer ring support (15) arranged sequentially from top to bottom at the bottom of the annular frame (42). The third floating ring (14) includes a third main ring body (141), and a first mounting groove (142) is provided on the upper surface of the third main ring body (141). The second connector (8) extends into the interior of the first mounting groove (142). A water collecting outer ring (145) is provided on the side of the third main ring body (141) away from the turbine stator (3). The third main ring body (141) faces towards... A third sealing groove (143) is provided for the turbine stator (3). Inside the third sealing groove (143) is a third O-ring (144) whose outer ring is tightly fitted to the inner wall of the turbine stator (3). The inner diameter of the top of the water collecting outer ring (145) is larger than the inner diameter of its bottom. The outer ring support (15) includes a hollow outer ring (151) provided at the bottom of the third main ring body (141). The inner ring surface of the hollow outer ring (151) is provided with a first inverted frustum through hole (152) that is tightly fitted to the water collecting outer ring (145).

10. A turbine drill bit with a floating ring according to claim 9, characterized in that: The bottom end of the hollow cylinder (41) is provided with a fourth floating ring (16) and an inner ring support (17) from top to bottom. The fourth floating ring (16) includes a connecting ring (161) provided at the bottom end of the hollow cylinder (41). A water collecting inner ring (162) is provided on the side of the connecting ring (161) facing the turbine stator (3). The inner diameter of the top of the water collecting inner ring (162) is larger than the inner diameter of its bottom. The inner ring support (17) includes a hollow inner ring (171) provided at the bottom end of the connecting ring (161). The inner ring surface of the hollow inner ring (171) is provided with a second inverted frustum through hole (172) that fits tightly with the water collecting inner ring (162).

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