A reliable high speed multi-span propeller shaft system

Abstract

The application discloses a reliable high-speed multi-span transmission shaft system, and solves the problem of frequent axial movement of the shaft structure and difficulty in centering of the shaft structure during high-speed operation, which leads to unreliable operation, and specifically comprises a driving shaft, a loading unit and a load rotor unit which are coaxially connected in sequence, wherein a floating bushing is arranged in the loading unit, an oil film support gap is arranged between the floating bushing and a transition supporting sleeve, and an annular oil cavity and an oil supply throttle hole are arranged on the transition supporting sleeve; the oil film support gap can be filled with pressure oil film for support through the oil supply throttle hole and the annular oil cavity during system operation, so that the transition supporting sleeve and the shell connected with the transition supporting sleeve, the push-pull force loading mechanism and the driving adapter shaft can be adaptively adjusted, the high-precision centering requirement of the shaft system under the high-speed operation environment is met, and the operation reliability is improved.

Description

Technical Field

[0001] This invention relates to multi-span drive shaft systems, and more specifically to a reliable high-speed multi-span drive shaft system. Background Technology

[0002] In high-speed rotating fluid machinery such as turbopumps and compressors, the pressure difference of the fluid before and after the flow components generates a certain dynamic axial force, which causes axial displacement and vibration of the rotor system. When such high-speed rotating fluid machinery operates on the ground, its rotating components, drive system, and drive connection system form a complex multi-span shaft system structure. In multi-span shaft systems, the axial displacement and vibration of the rotor caused by axial force are generally addressed directly using spline sleeves or diaphragm couplings with axial compensation functions. However, under ultra-high-speed operation, if spline sleeves are used to drive the rotating components directly, the weight of the spline sleeves themselves will adversely affect the vibration of the shaft system; and diaphragm couplings can only compensate for a small amount of axial displacement. When the axial displacement is too large, the diaphragm couplings are at risk of instability. These factors pose hidden dangers to the high-speed operation of the shaft system. On the other hand, high-speed rotating shaft systems have high requirements for rotor alignment. Multi-span structures and high-speed rotating vibration environments pose even greater challenges to shaft alignment. Ensuring good alignment of multi-span shaft systems under high-speed rotating conditions is currently a challenging engineering problem without an optimal solution. Summary of the Invention

[0003] To address the technical problems of unreliable operation caused by frequent axial movement and difficulty in aligning the shaft system during high-speed operation, this invention provides a reliable high-speed multi-span transmission shaft system.

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

[0005] A reliable high-speed multi-span drive shaft system includes a drive shaft; its special feature is that it also includes a loading unit and a load rotor unit arranged sequentially at the drive end of the drive shaft.

[0006] The loading unit includes a cylindrical outer shell, and a drive adapter shaft, a floating bushing, a transition support sleeve, a push-pull loading mechanism, and two annular pressure end caps disposed within the outer shell.

[0007] The side wall of the outer casing is provided with an oil supply channel;

[0008] The drive adapter shaft is coaxially arranged with the housing, one end of which is coaxially connected to the drive end of the drive shaft, and the other end is connected to the load rotor unit through the loading spindle.

[0009] The floating bushing is coaxially fitted onto the outside of the drive adapter shaft and is rotatably connected to the drive adapter shaft;

[0010] The transition support sleeve is coaxially fitted outside the floating bushing and is detachably connected to the outer shell, and an oil film support gap is provided between it and the floating bushing; the transition support sleeve has a concave annular oil cavity around its inner wall, and an oil supply throttling hole is also provided along its radial direction, penetrating the inner wall of the annular oil cavity and the outer wall of the transition support sleeve, and the oil supply throttling hole is correspondingly connected to the oil supply channel.

[0011] The two pressure end caps are coaxially mounted on the outside of the drive adapter shaft, and are located at the two ends of the floating bushing and the transition support sleeve, respectively. Their outer rings are detachably connected to the transition support sleeve, and there is a gap between their inner walls and the outer wall of the drive adapter shaft.

[0012] One end of the push-pull loading mechanism is detachably connected to the outer shell, and the other end passes through the transition support sleeve and is installed on the loading spindle.

[0013] Furthermore, the inner wall of the transition support sleeve is provided with two annular oil chambers arranged side by side along its axial direction, and is provided with two oil supply throttling holes corresponding to each annular oil chamber respectively;

[0014] The two annular oil chambers are symmetrically arranged along the central vertical plane of the floating bushing axis, and the volume of each annular oil chamber is 5-10 times the volume of the corresponding oil supply throttle orifice.

[0015] Furthermore, the transition support sleeve is also provided with an inwardly recessed annular adjustment cavity for adjusting the axial length of the oil film support around its inner wall, and a first oil return hole is provided radially therethrough through the inner wall of the annular adjustment cavity and the outer wall of the transition support sleeve.

[0016] The axial distance between the annular adjusting cavity and the two annular oil cavities is equal.

[0017] Furthermore, two angular contact bearings are also fitted between the floating bushing and the drive adapter shaft;

[0018] The drive adapter shaft is provided with two annular limiting protrusions around its outer wall. The two annular limiting protrusions are symmetrically arranged along the vertical plane of the floating bushing axis, and the two annular limiting protrusions are respectively located close to the two pressure end caps.

[0019] The two angular contact bearings are respectively located between the two annular limiting protrusions and the adjacent pressure end caps, and multiple wave springs are evenly distributed circumferentially between each angular contact bearing and the adjacent pressure end cap; annular gaskets are provided between the multiple wave springs and the angular contact bearings.

[0020] The outer ring of the angular contact bearing is tightly fitted to the floating bushing, and its inner ring is tightly fitted to the drive adapter shaft.

[0021] Furthermore, the loading unit also includes a flexible coupling and a spline sleeve;

[0022] The spline sleeve is fitted onto one end of the drive adapter shaft. Its inner wall has a positioning surface that matches the outer surface of one end of the drive adapter shaft. An axial countersunk hole is provided at the center of the end away from the drive adapter shaft. A spline flange is also provided on the outer wall of this end for connection with the flange at one end of the flexible coupling.

[0023] The end face of the drive adapter shaft is provided with a threaded hole for engaging with the axial countersunk hole. A connecting center screw passes through the axial countersunk hole and the threaded hole for connecting the drive adapter shaft and the spline sleeve.

[0024] The other end of the flexible coupling extends out of the housing and is connected to the coaxial flange of the drive end of the drive shaft.

[0025] Furthermore, the other end of the drive adapter shaft is provided with a folded drum-shaped external spline around its outer wall, and each spline tooth root is provided with a radial oil return hole.

[0026] The loading mandrel includes a mandrel body and a first annular limiting plate and a second annular limiting plate arranged side by side on its outer wall along its axial direction; the first annular limiting plate and the second annular limiting plate are both provided with reinforcing ribs between themselves and the mandrel body.

[0027] One end of the spindle body is fitted onto the other end of the drive adapter shaft and connected to the drive adapter shaft via a folded drum-shaped external spline. The other end of the spindle body is provided with a shaft body flange for connection to the load rotor unit flange.

[0028] Furthermore, the push-pull force loading mechanism includes a push-pull force sliding bearing ring and multiple drive components evenly distributed circumferentially on the same side of the push-pull force sliding bearing ring;

[0029] The push-pull sliding bearing ring is fitted outside the mandrel body and is clamped between the first annular limiting plate and the second annular limiting plate. A gap is provided between the inner wall of the push-pull sliding bearing ring and the outer wall of the mandrel body.

[0030] The drive assembly includes a loading cylinder connected to the cylinder body and the outer shell, a force sensor with one end coaxially connected to the drive end of the loading cylinder, a loading rod with one end coaxially connected to the other end of the force sensor, and a linear bearing sleeve rotatably fitted outside the loading rod.

[0031] The linear bearing sleeve passes axially through the side wall of the transition support sleeve, and one end of it is connected to the corresponding end face flange of the transition support sleeve.

[0032] The other end of the loading rod is fixedly connected to the push-pull sliding bearing ring.

[0033] Furthermore, the push-pull sliding bearing ring is a double-sided push-pull sliding bearing ring, and its axial outer wall cross-section is arc-shaped.

[0034] Furthermore, the load rotor unit includes a rotor, a rotor transition support ring rotatably mounted outside the rotor, and a rotor support seat supported on the outer circle of the rotor transition support ring;

[0035] One end of the rotor is connected to the flange at the other end of the spindle body via a shaft body flange.

[0036] The rotor transition support ring is a two-half split rotating body assembly. Its inner wall is rotatably connected to the rotor through a connecting bearing, and one end of its outer wall is connected to the rotor support flange.

[0037] The inner and outer walls of the rotor transition support ring are respectively provided with positioning surfaces that mate with the outer wall of the connecting bearing and the inner wall of the rotor support seat.

[0038] Furthermore, the outer shell includes a cylindrical shell body and a transition shaft support fixedly inserted through the middle of the shell body and fitted onto the transition support sleeve.

[0039] The transition support sleeve is detachably connected to the adapter shaft support seat;

[0040] One end of the push-pull force loading mechanism is detachably connected to the shell body;

[0041] The oil supply channel is located on the adapter shaft support;

[0042] The adapter shaft support is also provided with a second oil return hole corresponding to the first oil return hole.

[0043] The beneficial effects of this invention are:

[0044] 1. The present invention provides a reliable high-speed multi-span transmission shaft system, which is provided with a drive shaft, a loading unit and a load rotor unit connected coaxially in sequence. The loading unit is provided with a floating bushing, and an oil film support gap is provided between the floating bushing and the transition support sleeve. At the same time, an annular oil cavity and an oil supply throttle hole are provided on the transition support sleeve. During system operation, the pressure oil film for support can be delivered to the oil film support gap through the oil supply throttle hole and the annular oil cavity. This allows the transition support sleeve and the outer shell connected to the transition support sleeve, the push-pull loading mechanism and the drive adapter shaft to be adaptively adjusted, so as to meet the high-precision alignment requirements of the shaft system under high-speed operating conditions, thereby improving its operational reliability.

[0045] 2. The present invention provides a reliable high-speed multi-span transmission shaft system, in which a first oil return hole is provided in the middle of the transition support sleeve. The axial length of the support oil film can be controlled more precisely through the oil return hole, so as to control the alignment between the transition support sleeve and the drive adapter shaft more precisely.

[0046] 3. The present invention provides a reliable high-speed multi-span transmission shaft system, wherein a spline sleeve with a spline flange and a positioning surface is provided on one end of the drive adapter shaft, so that the flexible coupling and the drive adapter shaft have better alignment when transmitting power reliably.

[0047] 4. The other end of the drive adapter shaft in this invention is provided with a reversible drum-shaped external spline around its outer wall. The reversible drum-shaped external spline can improve the adaptability between the loading mandrel and the drive adapter shaft during system operation, further improve the alignment of the entire system, and effectively isolate the vibration transmission between the two rotors.

[0048] 5. In this invention, the root of the folded drum-shaped external spline at the other end of the drive adapter shaft is provided with a radial oil return hole, which can continuously spray oil during use to avoid wear or seizing of the spline teeth during high-speed operation.

[0049] 6. The present invention provides a reliable high-speed multi-span transmission shaft system, which also includes a transition shaft support and a rotor support. The transition support sleeve is connected to the flange of the transition shaft support, and the rotor transition support ring is connected to the flange of the rotor support. This can prevent axial movement during system operation and improve system stability. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of an embodiment of a reliable high-speed multi-span drive shaft system according to the present invention;

[0051] Figure 2 This is a schematic diagram of the loading unit in an embodiment of the present invention;

[0052] Figure 3 This is a partial structural diagram of the loading unit in an embodiment of the present invention;

[0053] Figure 4 This is a schematic diagram of the loading mandrel in an embodiment of the present invention;

[0054] Figure 5 This is a schematic diagram of the push-pull force loading mechanism in an embodiment of the present invention;

[0055] Figure 6 This is a schematic diagram of the rotor transition support ring in an embodiment of the present invention.

[0056] Icon labels:

[0057] 1-Drive shaft, 2-Flexible coupling, 3-Drive adapter shaft, 4-Angular contact bearing, 5-Pressure end cap, 6-Floating bushing, 7-Transition support sleeve, 8-Adapter shaft support seat, 9-Loading mandrel, 10-Push-pull loading mechanism, 11-Rotor, 12-Rotor transition support ring, 13-Rotor support seat, 14-Annular oil chamber, 15-Oil film support clearance, 16-Wave spring, 17-Oil supply throttle orifice, 18-Spline sleeve, 19-Center 20-Screw, 21-Loading cylinder, 22-Force sensor, 23-Loading rod, 24-Linear bearing sleeve, 25-Push-pull force sliding bearing ring, 26-Annular adjusting cavity, 27-First oil return hole, 28-Annular limiting protrusion, 29-Annular gasket, 30-Folded drum-shaped external spline, 31-Mandrel body, 32-First annular limiting plate, 33-Second annular limiting plate, 34-Shaft body flange, 35-Connecting bearing. Detailed Implementation

[0058] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] This invention provides a reliable high-speed multi-span drive shaft system, combined with... Figures 1-3 As shown, the system includes a drive shaft 1; it also includes a loading unit and a load rotor unit sequentially disposed at the drive end of the drive shaft 1.

[0060] The loading unit includes a cylindrical housing, and a drive adapter shaft 3, a floating bushing 6, a transition support sleeve 7, a push-pull loading mechanism 10, a flexible coupling 2, a spline sleeve 18, and two annular pressure end caps 5 disposed within the housing.

[0061] The outer casing includes a cylindrical casing body and a transition shaft support 8 fixedly inserted in the middle of the casing body and fitted outside the transition support sleeve 7; two oil supply channels are provided on the transition shaft support 8; the transition shaft support 8 is also provided with a second oil return hole 36.

[0062] Two pressure end caps 5 are coaxially fitted onto the drive adapter shaft 3, and are located at the two ends of the floating bushing 6 and the transition support sleeve 7, respectively. Their outer rings are detachably connected to the transition support sleeve 7, and there is a gap between their inner walls and the outer walls of the drive adapter shaft 3. The floating bushing 6 is limited by the pressure end caps 5.

[0063] The drive adapter shaft 3 is coaxially arranged with the housing. One end of the drive shaft 3 is coaxially connected to the drive end of the drive shaft 1, and the other end is connected to the load rotor unit through the loading mandrel 9. Two annular limiting protrusions 27 are provided around the outer wall of the drive adapter shaft 3. The two annular limiting protrusions 27 are symmetrically arranged along the vertical plane of the axis of the floating bushing 6, and the two annular limiting protrusions 27 are respectively located close to the two pressure end caps 5. The spline sleeve 18 is fitted on one end of the drive adapter shaft 3. The inner wall of the spline sleeve 18 is provided with a positioning surface that matches the outer surface of one end of the drive adapter shaft 3. An axial countersunk hole is provided at the center of the end away from the drive adapter shaft 3. A spline flange 29 is also provided on the outer wall of this end for connecting with the flange of one end of the flexible coupling 2. The end face of the drive adapter shaft 3 is provided with a threaded hole for cooperating with the axial countersunk hole. A connecting center screw 19 passes through the axial countersunk hole and the threaded hole for connecting the drive adapter shaft 3 and the spline sleeve 18. The other end of the flexible coupling 2 extends out of the housing and is coaxially connected to the flange of the drive end of the drive shaft 1. The other end of the drive adapter shaft 3 is provided with a folded drum-shaped external spline 30 around its outer wall, and each spline tooth root is provided with a radial oil return hole.

[0064] A floating bushing 6 is coaxially fitted onto the drive adapter shaft 3 and rotatably connected to it. Two angular contact bearings 4 are also fitted between the floating bushing 6 and the drive adapter shaft 3. The two angular contact bearings 4 are respectively located between two annular limiting protrusions 27 and adjacent pressure end caps 5, and multiple wave springs 16 are evenly distributed circumferentially between each angular contact bearing 4 and the adjacent pressure end cap 5. Annular washers 28 are provided between the multiple wave springs 16 and the angular contact bearings 4. The outer ring of the angular contact bearing 4 is tightly fitted to the floating bushing 6, and its inner ring is tightly fitted to the drive adapter shaft 3. The pressure end cap 5 preloads the angular contact bearings 4 axially with the circumferentially distributed wave springs 16.

[0065] The transition support sleeve 7 is coaxially fitted onto the floating bushing 6 and detachably connected to the adapter shaft support seat 8. An oil film support gap 15 is provided between the transition support sleeve 7 and the floating bushing 6, and the total axial length of the oil film support gap 15 is not less than 1 / 2 of the axial length of the floating bushing 6. The transition support sleeve 7 has two concave annular oil cavities 14 around its inner wall, and two oil supply throttling holes 17 are also provided radially, penetrating the inner wall of the annular oil cavity 14 and the outer wall of the transition support sleeve 7. The two oil supply throttling holes 17 are correspondingly connected to two oil supply channels. The two annular oil cavities 14 are symmetrically arranged along the vertical plane of the axis of the floating bushing 6, and the volume of each annular oil cavity 14 is 5-10 times the volume of the corresponding oil supply throttling hole 17. The transition support sleeve 7 is also provided with an inwardly recessed annular adjustment cavity 25 for adjusting the axial length of the oil film support, and a first oil return hole 26 is provided radially through the inner wall of the annular adjustment cavity 25 and the outer wall of the transition support sleeve 7. The first oil return hole 26 is connected to the second oil return hole 36. The axial distance between the annular adjustment cavity 25 and the two annular oil cavities 14 is equal.

[0066] like Figure 4 As shown, the loading mandrel 9 includes a mandrel body 31 and a first annular limiting plate 32 and a second annular limiting plate 33 arranged side by side on its outer wall along its axial direction; the first annular limiting plate 32 and the second annular limiting plate 33 are both provided with reinforcing ribs between them and the mandrel body 31; one end of the mandrel body is fitted onto the other end of the drive adapter shaft 3 and is connected to the drive adapter shaft 3 through a folded drum-shaped external spline 30, and the other end is provided with a shaft body flange 34 for connecting to the load rotor unit flange.

[0067] like Figure 5 As shown, the push-pull force loading mechanism 10 includes a push-pull force sliding bearing ring 24 and multiple drive components evenly distributed around the same side of the push-pull force sliding bearing ring 24 in the circumferential direction; the push-pull force sliding bearing ring 24 is fitted outside the spindle body 31 and is clamped between the first annular limiting plate 32 and the second annular limiting plate 33, and there is a gap between the inner wall of the push-pull force sliding bearing ring 24 and the outer wall of the spindle body 31; the push-pull force sliding bearing ring 24 is a double-sided push-pull force sliding bearing ring, and its axial outer wall cross-section is arc-shaped. The drive assembly includes a loading cylinder 20 connected to the housing body of the cylinder block and the outer shell, a force sensor 21 coaxially connected at one end to the drive end of the loading cylinder 20, a loading rod 22 coaxially connected at one end to the other end of the force sensor 21, and a linear bearing sleeve 23 rotatably fitted over the loading rod 22. The linear bearing sleeve 23 is axially inserted into the side wall of the transition support sleeve 7, with one end connected to the corresponding end flange of the transition support sleeve 7. The other end of the loading rod 22 is fixedly inserted into the push-pull force sliding bearing ring 24. The loading cylinder 20 transmits the push-pull force to the rotor 11 through the force sensor 21, the loading rod 22, the push-pull force sliding bearing ring 24, and the loading spindle 9. The loading rod 22 passes through the linear bearing sleeve 23 to ensure that the loading direction of the thrust is along the axial direction of the rotor 11. The push-pull force sliding bearing ring 24 does not contact the loading spindle 9 radially.

[0068] The load rotor unit includes a rotor 11, a rotor transition support ring 12 rotatably mounted on the outside of the rotor 11, and a rotor support seat 13 supported on the outer circle of the rotor transition support ring 12; one end of the rotor 11 is connected to the flange at the other end of the spindle body 31 via a shaft body flange 34; Figure 6 As shown, the rotor transition support ring 12 is a two-part split rotating assembly. Its inner wall is rotatably connected to the rotor 11 via a connecting bearing 35, and one end of its outer wall is connected to the flange of the rotor support seat 13. The inner and outer walls of the rotor transition support ring 12 are respectively provided with positioning surfaces that mate with the outer wall of the connecting bearing 35 and the inner wall of the rotor support seat 13. The rotor transition support ring 12 has strict requirements for the processing technology: the split surfaces are machined first, and then the assembly is machined. At the same time, there is a positioning device between the two split structures.

[0069] The drive shaft 1 transmits the driving torque to the drive adapter shaft 3 through the flexible coupling 2, which drives the rotor 11 to run at high speed on the rotor transition support ring 12 and the rotor support seat 13.

[0070] The system installation and usage steps described above are as follows:

[0071] Step 1: Determine the axial positions of drive shaft 1, adapter shaft support 8 and two rotor support seats 13. After completing the alignment of the above four components, tighten adapter shaft support 8 and rotor support seats 13.

[0072] Step 2: Install the transition support sleeve 7 inside the adapter shaft support seat 8.

[0073] Step 3: Install the angular contact bearing 4 supported by the floating bushing 6 and the drive adapter shaft 3 into the transition support sleeve 7 in step 2, and at the same time install the wave spring 16, and press the two ends with the pressure end caps 5.

[0074] Step 4: Install the spline sleeve 18 onto the drive end of the drive adapter shaft 3 and tighten it with the center screw 19. Then install the flexible coupling 2.

[0075] Step 5: Install the loading mandrel 9 and the push-pull loading mechanism 10, and push in the assembly consisting of the rotor transition support ring 12 and the rotor 11 from the non-drive end. Complete the installation of the entire high-speed multi-span transmission shaft system structure.

[0076] Step 6: The push-pull loading mechanism 10 transmits the preset axial push / pull force to the rotor 11 through the loading mandrel 9. The drive shaft 1 drives the rotor 11 to run at high speed through the flexible coupling 2 and the drive adapter shaft 3. High-pressure oil is introduced into the annular oil cavity 14 between the floating bushing 6 and the transition support sleeve 7 to achieve self-adaptive alignment of the multi-span shaft system during high-speed operation.

[0077] Step 7: After operation, the assembly consisting of rotor transition support ring 12 and rotor 11 is removed from the non-drive end and dismantled, while the installation state of the remaining structures remains unchanged. The assembly consisting of drive adapter shaft 3 and its support structure, loading spindle 9, push-pull loading mechanism 10, etc., can also be moved or dismantled as a whole.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A reliable high-speed multi-span drive shaft system, comprising a drive shaft (1); characterized in that: It also includes a loading unit and a load rotor unit that are sequentially arranged at the drive end of the drive shaft (1); The loading unit includes a cylindrical outer shell, and a drive adapter shaft (3), a floating bushing (6), a transition support sleeve (7), a push-pull loading mechanism (10), and two annular pressure end caps (5) disposed inside the outer shell. The side wall of the outer casing is provided with an oil supply channel; The drive adapter shaft (3) is coaxially arranged with the housing, one end of which is coaxially connected to the drive end of the drive shaft (1), and the other end is connected to the load rotor unit through the loading spindle (9). The floating bushing (6) is coaxially fitted outside the drive adapter shaft (3) and is rotatably connected to the drive adapter shaft (3); The transition support sleeve (7) is coaxially fitted outside the floating bushing (6) and detachably connected to the outer shell, and an oil film support gap (15) is provided between it and the floating bushing (6); the transition support sleeve (7) has an inwardly recessed annular oil cavity (14) around its inner wall, and an oil supply throttling hole (17) is also provided along its radial direction, penetrating the inner wall of the annular oil cavity (14) and the outer wall of the transition support sleeve (7), and the oil supply throttling hole (17) is correspondingly connected to the oil supply channel; The two pressure end caps (5) are coaxially mounted on the outside of the drive adapter shaft (3) and are located at the two ends of the floating bushing (6) and the transition support sleeve (7), respectively. Their outer rings are detachably connected to the transition support sleeve (7), and there is a gap between their inner wall and the outer wall of the drive adapter shaft (3). One end of the push-pull loading mechanism (10) is detachably connected to the outer shell, and the other end passes through the transition support sleeve (7) and is installed on the loading spindle (9); The transition support sleeve (7) is also provided with an inwardly recessed annular adjustment cavity (25) for adjusting the axial length of the oil film support around its inner wall, and a first oil return hole (26) is provided along its radial direction, penetrating the inner wall of the annular adjustment cavity (25) and the outer wall of the transition support sleeve (7). The axial distance between the annular regulating cavity (25) and the two annular oil cavities (14) is equal.

2. The reliable high-speed multi-span drive shaft system according to claim 1, characterized in that: The inner wall of the transition support sleeve (7) is provided with two annular oil chambers (14) arranged in parallel along its axial direction, and is provided with two oil supply throttling holes (17) corresponding to each annular oil chamber (14). The two annular oil chambers (14) are symmetrically arranged along the central vertical plane of the floating bushing (6) axis, and the volume of each annular oil chamber (14) is 5-10 times the volume of the corresponding oil supply throttle hole (17).

3. The reliable high-speed multi-span drive shaft system according to claim 2, characterized in that: Two angular contact bearings (4) are also fitted between the floating bushing (6) and the drive adapter shaft (3). The drive adapter shaft (3) is provided with two annular limiting protrusions (27) around its outer wall. The two annular limiting protrusions (27) are symmetrically arranged along the central vertical plane of the floating bushing (6) axis, and the two annular limiting protrusions (27) are respectively located close to the two pressure end caps (5). The two angular contact bearings (4) are respectively located between the two annular limiting protrusions (27) and the adjacent pressure end caps (5), and multiple wave springs (16) are evenly distributed circumferentially between each angular contact bearing (4) and the adjacent pressure end caps (5); annular gaskets (28) are provided between the multiple wave springs (16) and the angular contact bearings (4). The outer ring of the angular contact bearing (4) is tightly fitted to the floating bushing (6), and its inner ring is tightly fitted to the drive adapter shaft (3).

4. The reliable high-speed multi-span drive shaft system according to claim 3, characterized in that: The loading unit also includes a flexible coupling (2) and a spline sleeve (18). The spline sleeve (18) is fitted onto one end of the drive adapter shaft (3). Its inner wall is provided with a positioning surface that matches the outer surface of one end of the drive adapter shaft (3). An axial countersunk hole is provided at the center of the end away from the drive adapter shaft (3). A spline flange (29) is also provided on the outer wall of the end of the spline sleeve (18) away from the drive adapter shaft (3) for connecting with the flange at one end of the flexible coupling (2). The end face of the drive adapter shaft (3) is provided with a threaded hole for engaging with the axial countersunk hole. A connecting center screw (19) is inserted in the axial countersunk hole and the threaded hole for connecting the drive adapter shaft (3) and the spline sleeve (18). The other end of the flexible coupling (2) extends out of the housing and is coaxially connected to the drive end flange of the drive shaft (1).

5. The reliable high-speed multi-span drive shaft system according to claim 4, characterized in that: The other end of the drive adapter shaft (3) is provided with a folded drum-shaped external spline (30) around its outer wall, and each spline tooth root is provided with a radial oil return hole. The loading mandrel (9) includes a mandrel body (31) and a first annular limiting plate (32) and a second annular limiting plate (33) arranged side by side on its outer wall along its axial direction; the first annular limiting plate (32) and the second annular limiting plate (33) are provided with reinforcing ribs between them and the mandrel body (31); One end of the spindle body is fitted onto the other end of the drive adapter shaft (3) and is connected to the drive adapter shaft (3) via a folded drum-shaped external spline (30). The other end of the spindle body is provided with a shaft body flange (34) for connection with the load rotor unit flange.

6. The reliable high-speed multi-span drive shaft system according to claim 5, characterized in that: The push-pull force loading mechanism (10) includes a push-pull force sliding bearing ring (24) and multiple drive components that are evenly distributed around the same side of the push-pull force sliding bearing ring (24); The push-pull sliding bearing ring (24) is fitted outside the spindle body (31) and is clamped between the first annular limiting plate (32) and the second annular limiting plate (33). There is a gap between the inner wall of the push-pull sliding bearing ring (24) and the outer wall of the spindle body (31). The drive assembly includes a loading cylinder (20) connected to the cylinder body and the outer shell, a force sensor (21) with one end coaxially connected to the drive end of the loading cylinder (20), a loading rod (22) with one end coaxially connected to the other end of the force sensor (21), and a linear bearing sleeve (23) rotatably fitted outside the loading rod (22). The linear bearing sleeve (23) is axially inserted into the side wall of the transition support sleeve (7), and one end of it is connected to the corresponding end face flange of the transition support sleeve (7). The other end of the loading rod (22) is fixedly connected to the push-pull sliding bearing ring (24).

7. The reliable high-speed multi-span drive shaft system according to claim 6, characterized in that: The push-pull sliding bearing ring (24) is a double-sided push-pull sliding bearing ring, and its axial outer wall cross-section is arc-shaped.

8. The reliable high-speed multi-span drive shaft system according to claim 7, characterized in that: The load rotor unit includes a rotor (11), a rotor transition support ring (12) rotatably mounted on the outside of the rotor (11), and a rotor support seat (13) supported on the outer circle of the rotor transition support ring (12). One end of the rotor (11) is connected to the flange at the other end of the spindle body (31) via a shaft body flange (34); The rotor transition support ring (12) is a two-half split rotating body assembly. Its inner wall is rotatably connected to the rotor (11) through a connecting bearing (35), and one end of its outer wall is connected to the flange of the rotor support seat (13). The inner and outer walls of the rotor transition support ring (12) are respectively provided with positioning surfaces that cooperate with the outer wall of the connecting bearing (35) and the inner wall of the rotor support seat (13).

9. The reliable high-speed multi-span drive shaft system according to any one of claims 2-8, characterized in that: The outer shell includes a cylindrical shell body and a transition shaft support seat (8) that is fixedly inserted through the middle of the shell body and fitted outside the transition support sleeve (7). The transition support sleeve (7) is detachably connected to the adapter shaft support seat (8); One end of the push-pull force loading mechanism (10) is detachably connected to the shell body; The oil supply channel is located on the adapter shaft support (8); The adapter shaft support (8) is also provided with a second oil return hole (36) corresponding to the first oil return hole (26).

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