Steerable double-layer protection type high-pressure oil pipe

Abstract

The invention provides a steerable double-layer protection type high-pressure oil pipe, and relates to the technical field of high-pressure oil pipe protection, the steerable double-layer protection type high-pressure oil pipe comprises an outer pipe, an inner pipe is arranged in the outer pipe, a gap is formed between the inner pipe and the outer pipe, a detection assembly is arranged at the gap between the inner pipe and the outer pipe, and the detection assembly comprises a sealing ring; the sealing rings are fixed to the outer wall of the inner pipe and the inner wall of the outer pipe at equal intervals, the movable ring is arranged between the two sealing rings and slides along the outer wall of the inner pipe and the inner wall of the outer pipe, the connecting ends are installed at the top and the bottom of the outer pipe, and the locking ends are installed in the connecting ends. The inner pipe and the outer pipe are layered through the detection assembly, oil leakage detection is conducted on each distance through the moving plate, the detection sensitivity can be improved, when oil leakage occurs, the transmission assembly can close the valve plate through kinetic energy transmitted by the moving plate, connection between the oil pipe and the outside is isolated, oil conveying is paused, and more leakage or bursting is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure oil pipe protection, in particular to a steerable double-layer protective high-pressure oil pipe. Background Art

[0002] High-pressure oil pipes are components of high-pressure oil circuits. They are required to withstand a certain oil pressure and have a certain fatigue strength to ensure the sealing requirements of the pipelines. Automotive high-pressure oil pipes are mainly used in high-pressure injection diesel engines and high-pressure injection direct injection gasoline engines. They can withstand the oil pressure required during engine operation. Existing high-pressure oil pipes have a wide range of applications. Once a high-pressure oil pipe ruptures, it will cause fuel splashing, and the personal and property safety during use cannot be guaranteed.

[0003] In the prior art, a set of protective tubes is often added to the outside of the oil pipe to enhance the anti-leakage and protection capabilities of the oil pipe. Some protective tubes can also play the role of oil reflux. However, in this technology, when the oil pipe leaks, the oil will enter between the outer pipe and the inner pipe. The leakage situation cannot be better known in the first time, and the protection measures for timely closing the oil pipe to reduce oil leakage are relatively poor. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a steerable double-layer protective high-pressure oil pipe to solve the problems raised in the above-mentioned background technology. The present invention has a novel structure. The detection component divides the inner tube and the outer tube into layers, and uses a movable plate to perform oil leakage detection for each distance, which can improve the detection sensitivity. When an oil leakage occurs, the transmission component will close the valve plate through the kinetic energy transmitted by the movable plate, isolate the oil pipe from the outside world, suspend the oil delivery, and avoid more leakage or explosion.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized by the following technical scheme: a steerable double-layer protective high-pressure oil pipe, comprising an outer pipe, an inner pipe is arranged inside the outer pipe, and a gap is arranged between the inner pipe and the outer pipe, a detection assembly is arranged at the gap between the inner pipe and the branch pipe, and the detection assembly comprises a sealing ring, and the sealing ring is fixed on the outer wall of the inner pipe and the inner wall of the outer pipe at equal distances, a moving ring is arranged between the two groups of the sealing rings, and the moving ring slides along the outer wall of the inner pipe and the inner wall of the outer pipe, and the top and bottom of the outer pipe are installed with connecting ends, and a locking end is installed inside the connecting end. A threaded ring is provided at one end of the locking end, and the threaded ring is threadedly connected to the inner wall of the connecting end, both ends of the inner tube pass through the locking end, a rotating ring is rotatably installed on the surface of the connecting end at the lower end of the inner tube, and a branch pipe is opened on the outside of the rotating ring, the branch pipe is connected with the inner tube, and a transmission assembly is provided on the outer surface of the outer tube, the transmission assembly includes a shaft rod, and the shaft rod is rotatably installed on the outer wall of the outer tube through a bearing seat, valve plates are rotatably installed inside the pipe openings at both ends of the inner tube, both ends of the shaft rod are transmission-connected to the valve plate, and a pressure sensor is installed on the inner wall of the inner tube.

[0006] Furthermore, the detection assembly also includes a guide rod. Two guide rods are fixed between the two groups of sealing rings. The guide rods are arranged in an arc shape around the gap between the inner tube and the outer tube. The movable ring is slidably sleeved on the two guide rods.

[0007] Furthermore, a rubber strip is fixed on the outer side of the sealing ring, and four sets of cover plates are equidistantly rotatably mounted on the inner side of the sealing ring, the cover plates of adjacent sealing rings are fixedly connected, and the movable ring is slidably sleeved on the surface of the cover plate.

[0008] Furthermore, shaft rings are rotatably mounted on both ends of the outer tube, and connecting plates are fixedly provided through sealing rings at both ends of the cover plate, and the connecting plates are fixedly connected to the shaft rings.

[0009] Furthermore, the transmission assembly also includes a transmission gear, and the transmission gears are fixed to both ends of the shaft rod. The outer side of the shaft ring is provided with external teeth, and the external teeth of the shaft ring are meshed and connected with the transmission gear.

[0010] Furthermore, both ends of the shaft rod are inserted into the connecting end and a driving bevel gear is fixed therein, a transmission groove is opened on the inner wall of the connecting end at the position corresponding to the driving bevel gear, and one end of the valve stem of the valve plate is inserted into the transmission groove and a driven bevel gear is fixed therein, and the driving bevel gear is meshingly connected with the driven bevel gear.

[0011] Furthermore, two clamping blocks are symmetrically and slidably mounted on the outer side of the collar, and fixing screws are inserted into the outer ends of the clamping blocks, and the fixing screws are locked and inserted into the connecting end.

[0012] Furthermore, a slot is provided inside the rotating ring, and a rotating ring is rotatably inserted inside the slot. A connecting port is provided on the surface of the rotating ring, and the connecting port is connected to the branch pipe and the inner pipe.

[0013] Furthermore, an inner gear ring is fixed on the inner wall of the outer end of the rotating ring, and the inner gear ring is meshed and connected with the transmission gear at the lower end of the shaft rod.

[0014] Furthermore, the guide rod is an arc sliding rod, and the guide rod is installed between the outer tube and the inner tube.

[0015] Beneficial effects of the present invention: 1. The present invention can conveniently adjust the angle of the rotating ring through the setting of the rotating ring, and is also convenient for subsequent maintenance. Under normal conditions, the connecting port of the rotating ring is connected with the branch pipe and the inner pipe. When the inner pipe leaks and the leakage is too much, the shaft drives the transmission gear at the lower end to rotate and engage with the inner gear ring, driving the rotating ring to rotate along the slot, staggering the connection position of the connecting port with the inner pipe and the branch pipe, thereby cutting off the connection and transportation between the inner pipe and the branch pipe.

[0016] 2. The shaft collar of the present invention is fixedly connected to the connecting end by a clamping block and a fixing screw, and the clamping block is slidably clamped on the outer side of the shaft collar. When the shaft collar is rotated by the cover plate, the position of the clamping block remains unchanged, connecting and fixing the outer tube and the connecting end.

[0017] 3. The present invention causes the outer teeth to mesh with the transmission gear at the upper end of the shaft rod by rotating the shaft ring, thereby driving the active bevel gear and the driven bevel gear in the transmission groove to mesh and transmit, so that the valve plates at the pipe openings at both ends of the inner tube are closed. The closure of the inner tube does not mean that it is closed immediately as soon as oil leakage occurs, which is easy to affect the normal use of the oil pipe. When the oil leakage is small and is not enough to support the moving plate to move to the sealing ring positions on both sides, the angle rotated by the shaft rod and the transmission gear will not allow the valve plate to completely close the pipe opening. At this time, it is only necessary to make timely maintenance or adjustments when a leakage is detected by the pressure sensor inside the inner tube. When the leakage is serious, when the moving ring moves to any position of the sealing rings at both ends, the valve plate is rotated to a horizontal state through the driving force after the transmission to completely close the pipe opening, and the oil pipe is cut off from continuing to transport oil to avoid the risk of bursting.

[0018] 4. The present invention uses the cover plate to provide temporary protection. If the leakage cannot be blocked by the cover plate, the movable ring will continue to slide along the guide rod until it moves to the vicinity of the sealing ring. At this time, the transmission assembly will quickly close both ends of the inner tube to block part of the oil pipe to prevent further leakage. By dividing the space evenly by multiple sealing rings, the detection sensitivity can be improved, allowing the movable ring to respond quickly.

[0019] 5. Compared with the prior art, the detection component of the present invention divides the inner tube and the outer tube into layers, and uses a movable plate to detect oil leakage at each distance, which can improve the sensitivity of detection. When oil leakage occurs, the transmission component will close the valve plate through the kinetic energy transmitted by the movable plate, isolate the connection between the oil pipe and the outside world, suspend the oil delivery, and avoid more leakage or explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a steerable double-layer protective high-pressure oil pipe of the present invention; Figure 2 This is a schematic diagram of the internal structure of the outer tube of a steerable double-layer protective high-pressure oil pipe of the present invention; Figure 3 It is a schematic diagram of the separation of the connection end and the locking end of a steerable double-layer protective high-pressure oil pipe of the present invention; Figure 4 This is a schematic diagram of the bottom structure of a transmission assembly of a steerable double-layer protective high-pressure oil pipe of the present invention; Figure 5 It is a schematic diagram of the rotating ring and the separation of the rotating ring of a steerable double-layer protection type high-pressure oil pipe of the present invention; Figure 6 It is a schematic diagram of the top structure of a transmission assembly of a steerable double-layer protective high-pressure oil pipe of the present invention; Figure 7 It is a schematic diagram of the connection between the driving bevel gear and the driven bevel gear of a steerable double-layer protection type high-pressure oil pipe of the present invention; Figure 8 It is a schematic diagram of the internal structure of an inner tube of a steerable double-layer protective high-pressure oil pipe of the present invention; Fig. 9 It is a schematic diagram of the connection between the detection assembly and the shaft ring of a steerable double-layer protection type high-pressure oil pipe of the present invention; Fig.10 The present invention is a schematic diagram of the structure of a detection component of a steerable double-layer protective high-pressure oil pipe.

[0021] In the figure: 1. outer tube; 2. connecting end; 21. locking end; 22. threaded ring; 3. inner tube; 31. valve plate; 4. transmission assembly; 41. shaft rod; 42. transmission gear; 43. swivel; 44. internal gear ring; 45. shaft ring; 451. clamp; 46. fixing screw; 47. transmission groove; 48. driving bevel gear; 49. driven bevel gear; 5. branch pipe; 51. rotating ring; 52. connecting port; 53. slot; 6. detection assembly; 61. sealing ring; 62. rubber strip; 63. cover plate; 64. guide rod; 65. moving ring; 66. connecting plate. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0023] See also Figures 1 to 10 The present invention provides a technical solution: a steerable double-layer protective high-pressure oil pipe, comprising an outer pipe 1, characterized in that: an inner pipe 3 is arranged inside the outer pipe 1, and a gap is arranged between the inner pipe 3 and the outer pipe 1, a detection assembly 6 is arranged at the gap between the inner pipe 3 and the branch pipe 5, the detection assembly 6 comprises a sealing ring 61, the sealing ring 61 is equidistantly fixed on the outer wall of the inner pipe 3 and the inner wall of the outer pipe 1, a moving ring 65 is arranged between two groups of the sealing rings 61, the moving ring 65 slides along the outer wall of the inner pipe 3 and the inner wall of the outer pipe 1, a connecting end 2 is installed at the top and bottom of the outer pipe 1, and a locking end 21 is installed inside the connecting end 2, one end of the locking end 21 is provided with a threaded ring 22, and the threaded ring 22 is threadedly connected to the inner wall of the connecting end 2, both ends of the inner pipe 3 pass through the locking end 21, a rotating ring 51 is rotatably installed on the surface of the connecting end 2 at the lower end of the inner pipe 3, and the rotating ring A branch pipe 5 is opened on the outside of 51, and the branch pipe 5 is communicated with the inner pipe 3. A transmission component 4 is provided on the outer surface of the outer pipe 1, and the transmission component 4 includes a shaft rod 41, and the shaft rod 41 is rotatably installed on the outer wall of the outer pipe 1 through a bearing seat. Valve plates 31 are rotatably installed inside the pipe openings at both ends of the inner pipe 3. Both ends of the shaft rod 41 are transmission-connected with the valve plates 31. A pressure sensor is installed on the inner wall of the inner pipe 3. When the device is used, the outer pipe 1 is installed on the outside of the inner pipe 3, and the two ends of the outer pipe 1 are installed through threaded connection of the connecting end 2 and the locking end 21. When the inner pipe 3 leaks, the oil will enter between the two sealing rings 61 at the gap between the inner pipe 3 and the outer pipe 1, and the moving ring 65 is pushed to move by pressure. The transmission component 4 transfers kinetic energy when the moving ring 65 moves. When the leakage is too much, the two ends of the inner pipe 3 are closed in time to stop the oil from being transported to avoid further leakage and causing danger.

[0024] In this embodiment, the detection assembly 6 also includes a guide rod 64. Two guide rods 64 are fixed between the two groups of sealing rings 61. The guide rods 64 are arranged in an arc shape around the gap between the inner tube 3 and the outer tube 1. The moving ring 65 is slidably sleeved on the two guide rods 64. A rubber strip 62 is fixed on the outer side of the sealing ring 61, and four groups of cover plates 63 are equidistantly installed on the inner side of the sealing ring 61. The cover plates 63 of adjacent sealing rings 61 are fixedly connected, and the moving ring 65 is slidably sleeved on the surface of the cover plates 63. The guide rod 64 is an arc sliding rod, and the guide rod 64 is installed between the outer tube 1 and the inner tube 3. (The guide rod 64 is a spiral arc sliding rod. When the moving ring 65 moves along the surface of the guide rod 64, it will rotate with its curvature. In simple terms, when the moving ring 65 moves from the bottom to the top of a guide rod 64, the moving ring 65 just rotates ninety degrees.) The guide rod 64 is arranged in an inclined arc shape. Around the outside of the inner tube 3, the movable ring 65 is in the middle position in the initial state. Leakage at any position between the two sealing rings 61 will push the movable ring 65 to one side. When moving, the movable ring 65 will rotate slightly in the direction of the guide rod 64, driving the cover plate 63 to rotate synchronously. The cover plate 63 will cover and block the surface of the inner tube 3. If the leakage position is blocked by the cover plate 63 to reduce the leakage or stop the leakage, the leaking part can be repaired by a skilled worker. The cover plate 63 has a temporary protective effect. If the leakage cannot be blocked by the cover plate 63, the movable ring 65 will continue to slide along the guide rod 64 until it moves to the vicinity of the sealing ring 61. At this time, the transmission assembly 4 will quickly close the two ends of the inner tube 3, blocking part of the oil pipe to prevent further leakage. Dividing the space equidistantly by multiple sealing rings 61 can improve the detection sensitivity and enable the movable ring 65 to respond quickly.

[0025] In this embodiment, the two ends of the outer tube 1 are rotatably mounted with a shaft ring 45, the two ends of the cover plate 63 penetrate the sealing ring 61 and are fixed with a connecting plate 66, and the connecting plate 66 is fixedly connected to the shaft ring 45, the transmission assembly 4 also includes a transmission gear 42, the two ends of the shaft rod 41 are fixed with a transmission gear 42, the outer side of the shaft ring 45 is provided with an external tooth, and the external tooth of the shaft ring 45 is meshed with the transmission gear 42, the two ends of the shaft rod 41 penetrate the inside of the connecting end 2 and are fixed with an active bevel gear 48, and the inner wall of the connecting end 2 corresponds to the active bevel gear 48. A transmission groove 47 is provided at the position of the bevel gear 48, and one end of the valve stem of the valve plate 31 is inserted into the transmission groove 47 to fix a driven bevel gear 49, the driving bevel gear 48 is meshed and connected with the driven bevel gear 49, the outer side of the collar 45 is symmetrically slidably mounted with two clamping blocks 451, and the outer end of the clamping block 451 is plugged with a fixing screw 46, the fixing screw 46 is locked and plugged on the connecting end 2, the collar 45 is fixedly connected to the connecting end 2 through the clamping block 451 and the fixing screw 46, and the clamping block 451 is slidably plugged on the collar 4 5, when the collar 45 is driven by the cover plate 63 to rotate, the position of the block 451 remains unchanged, connecting and fixing the outer tube 1 and the connection end 2, the collar 45 rotates so that the outer teeth are engaged with the transmission gear 42 at the upper end of the shaft rod 41, thereby driving the active bevel gear 48 and the driven bevel gear 49 in the transmission groove 47 to engage and transmit, so that the valve plates 31 at the pipe openings at both ends of the inner tube 3 are closed. The closure of the inner tube 3 is not immediately closed as long as oil leakage occurs, which is easy to affect the normal use of the oil pipe. When the amount of oil leakage is small and not enough to support the moving plate When it moves to the position of the sealing rings 61 on both sides, the angle of rotation of the shaft rod 41 and the transmission gear 42 will not allow the valve plate 31 to completely close the pipe mouth. At this time, it is only necessary to make timely repairs or adjustments when a leakage is detected by the pressure sensor inside the inner tube 3. When the leakage is serious, when the moving ring 65 moves to any position of the sealing rings 61 at both ends, the valve plate 31 is rotated to a horizontal state through the driving force after the transmission to completely close the pipe mouth, cut off the oil pipe from continuing to transport oil, and avoid the risk of explosion.

[0026] In this embodiment, a slot 53 is provided inside the rotating ring 51, and a rotating ring 43 is rotatably inserted inside the slot 53. A connecting port 52 is provided on the surface of the rotating ring 43, and the connecting port 52 connects the branch pipe 5 and the inner pipe 3. An inner gear ring 44 is fixed on the inner wall of the outer end of the rotating ring 43, and the inner gear ring 44 is meshed and connected with the transmission gear 42 at the lower end of the shaft rod 41. The branch pipe 5 is a pipe opening for connecting to pipelines in other directions. Through the setting of the rotating ring 51, its angle can be easily adjusted, and subsequent maintenance is also convenient. Under normal conditions, the connecting port 52 of the rotating ring 43 is connected with the branch pipe 5 and the inner pipe 3. When the inner pipe 3 leaks and the leakage is too much, the shaft rod 41 drives the transmission gear 42 at the lower end to rotate and mesh with the inner gear ring 44, driving the rotating ring 43 to rotate along the slot 53, staggering the connecting position of the connecting port 52 with the inner pipe 3 and the branch pipe 5, thereby cutting off the connection and transportation between the inner pipe 3 and the branch pipe 5.

[0027] When the device is used, the outer tube 1 is installed on the outside of the inner tube 3, and the two ends of the outer tube 1 are installed by threaded connection of the connecting end 2 and the locking end 21. The branch tube 5 is a pipe opening for connecting to pipes in other directions. By setting the rotating ring 51, its angle can be easily adjusted, which is also convenient for subsequent maintenance. Under normal conditions, the connecting port 52 of the rotating ring 43 is connected with the branch tube 5 and the inner tube 3. When the inner tube 3 leaks and the leakage is too much, the shaft 41 drives the transmission gear 42 at the lower end to rotate and mesh with the inner gear ring 44, driving the rotating ring 43 to rotate along the slot 53, staggering the connecting position of the connecting port 52 with the inner tube 3 and the branch tube 5, thereby cutting off the connection between the inner tube 3 and the branch tube 5 In the initial state, the movable ring 65 is in the middle position. If leakage occurs at any position between the two sealing rings 61, the movable ring 65 will be pushed to one side. When the movable ring 65 moves, it will rotate slightly along the direction of the guide rod 64, driving the cover plate 63 to rotate synchronously. The cover plate 63 will cover and block the surface of the inner tube 3. If the leakage position is blocked by the cover plate 63, the leakage is reduced or does not continue to leak, and the leaking part can be repaired by a skilled worker. The cover plate 63 plays a temporary protective role. If the leakage cannot be blocked by the cover plate 63, the movable ring 65 will continue to slide along the guide rod 64 until it moves to the sealing The ring 61 is near, at this time, the transmission component 4 will quickly close the two ends of the inner tube 3, blocking the part of the oil pipe to prevent further leakage. The space can be divided equally by multiple sealing rings 61 to improve the detection sensitivity, so that the mobile ring 65 can react quickly. When the shaft ring 45 is driven by the cover plate 63 to rotate, the block 451 remains in the same position, connecting the fixed outer tube 1 and the connecting end 2. The shaft ring 45 rotates so that the external teeth are engaged with the transmission gear 42 at the upper end of the shaft rod 41, thereby driving the active bevel gear 48 and the driven bevel gear 49 in the transmission groove 47 to engage and transmit, so that the valve plates 31 at the two ends of the inner tube 3 are closed, and the closure of the inner tube 3 is not As soon as oil leakage occurs, it is immediately closed, which can easily affect the normal use of the oil pipe. When the amount of oil leakage is small and not enough to support the movable plate to move to the position of the sealing rings 61 on both sides, the angle of rotation of the shaft 41 and the transmission gear 42 will not allow the valve plate 31 to completely close the pipe mouth. At this time, it is only necessary to make timely repairs or adjustments when a leakage is detected by the pressure sensor inside the inner tube 3. When the leakage is serious, when the movable ring 65 moves to any position of the sealing rings 61 at both ends, the valve plate 31 is rotated to a horizontal state through the driving force after transmission to completely close the pipe mouth, cut off the oil pipe from continuing to transport oil, and avoid the risk of explosion.

[0028] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A steerable double-layer protective high-pressure oil pipe, comprising an outer pipe (1), characterized in that: An inner tube (3) is arranged inside the outer tube (1), and a gap is arranged between the inner tube (3) and the outer tube (1). A detection assembly (6) is arranged at the gap between the inner tube (3) and the branch tube (5). The detection assembly (6) comprises a sealing ring (61). The sealing ring (61) is fixed equidistantly on the outer wall of the inner tube (3) and the inner wall of the outer tube (1). A moving ring (65) is arranged between two groups of the sealing rings (61). The moving ring (65) slides along the outer wall of the inner tube (3) and the inner wall of the outer tube (1). The top and bottom of the outer tube (1) are provided with connecting ends (2), and a locking end (21) is arranged inside the connecting end (2). A threaded ring (22) is arranged at one end of the locking end (21). The threaded ring (22) is provided at one end of the locking end (21). ) is threadedly connected to the inner wall of the connecting end (2), the two ends of the inner tube (3) pass through the locking ends (21), a rotating ring (51) is rotatably mounted on the surface of the connecting end (2) at the lower end of the inner tube (3), and a branch pipe (5) is opened on the outer side of the rotating ring (51), and the branch pipe (5) is communicated with the inner tube (3), a transmission component (4) is provided on the outer surface of the outer tube (1), and the transmission component (4) includes a shaft (41), and the shaft (41) is rotatably mounted on the outer wall of the outer tube (1) through a bearing seat, and valve plates (31) are rotatably mounted inside the pipe openings at both ends of the inner tube (3), and the two ends of the shaft (41) are transmission-connected to the valve plate (31), and a pressure sensor is installed on the inner wall of the inner tube (3).

2. The steerable double-layer protective high-pressure oil pipe according to claim 1, characterized in that: The detection assembly (6) further comprises guide rods (64). Two guide rods (64) are fixed between the two sets of sealing rings (61). The guide rods (64) are arranged in an arc shape around the gap between the inner tube (3) and the outer tube (1). The movable ring (65) is slidably sleeved on the two guide rods (64).

3. The steerable double-layer protective high-pressure oil pipe according to claim 2, characterized in that: A rubber strip (62) is fixed to the outside of the sealing ring (61), and four groups of cover plates (63) are equidistantly rotatably mounted on the inside of the sealing ring (61); the cover plates (63) of adjacent sealing rings (61) are fixedly connected, and a movable ring (65) is slidably sleeved on the surface of the cover plates (63).

4. The steerable double-layer protective high-pressure oil pipe according to claim 3, characterized in that: The two ends of the outer tube (1) are rotatably mounted with shaft collars (45), and the two ends of the cover plate (63) are penetrated through the sealing rings (61) and fixed with connecting plates (66), and the connecting plates (66) are fixedly connected to the shaft collars (45).

5. The steerable double-layer protective high-pressure oil pipe according to claim 4, characterized in that: The transmission assembly (4) further comprises a transmission gear (42), the transmission gears (42) being fixed at both ends of the shaft rod (41), the outer side of the shaft ring (45) being provided with external teeth, and the external teeth of the shaft ring (45) being meshingly connected with the transmission gear (42).

6. The steerable double-layer protective high-pressure oil pipe according to claim 5, characterized in that: Both ends of the shaft rod (41) penetrate into the connection end (2) and are fixed with a driving bevel gear (48); a transmission groove (47) is provided on the inner wall of the connection end (2) at a position corresponding to the driving bevel gear (48); and one end of the valve stem of the valve plate (31) penetrates into the transmission groove (47) and is fixed with a driven bevel gear (49); the driving bevel gear (48) is meshingly connected with the driven bevel gear (49).

7. The steerable double-layer protective high-pressure oil pipe according to claim 6, characterized in that: Two clamping blocks (451) are symmetrically and slidably mounted on the outer side of the shaft ring (45), and fixing screws (46) are inserted into the outer ends of the clamping blocks (451), and the fixing screws (46) are locked and inserted into the connection end (2).

8. The steerable double-layer protective high-pressure oil pipe according to claim 7, characterized in that: A slot (53) is provided inside the rotating ring (51), and a rotating ring (43) is rotatably inserted inside the slot (53). A connecting port (52) is provided on the surface of the rotating ring (43), and the connecting port (52) is connected to the branch pipe (5) and the inner pipe (3).

9. The steerable double-layer protective high-pressure oil pipe according to claim 8, characterized in that: An inner gear ring (44) is fixed on the inner wall of the outer end of the rotating ring (43), and the inner gear ring (44) is meshedly connected with the transmission gear (42) at the lower end of the shaft rod (41).

10. The steerable double-layer protective high-pressure oil pipe according to claim 2, characterized in that: The guide rod (64) is an arc sliding rod, and the guide rod (64) is installed between the outer tube (1) and the inner tube (3).

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