Reliable-operation high-speed multi-span transmission shaft system

Abstract

The invention discloses a high-speed multi-span transmission shaft system reliable in operation, which solves the problem of unreliable operation caused by frequent axial movement of a shaft system structure in a high-speed operation process and difficulty in adaption of centering of a shaft system, 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 supporting gap is formed between the floating bushing and a transition supporting sleeve, and meanwhile, an annular oil cavity and an oil supply throttling hole are formed in the transition supporting sleeve, so that a pressure oil film for supporting can be conveyed into the oil film supporting gap through the oil supply throttling hole and the annular oil cavity when the system works; therefore, the transition supporting sleeve, 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 in a high-speed operation environment is met, and the operation reliability of the shaft system is improved.

Description

Technical Field

[0001] The invention relates to a multi-span transmission shaft system, in particular to a high-speed multi-span transmission shaft system with reliable operation. Background Art

[0002] In high-speed rotating fluid machinery, such as turbopumps and compressors, the pressure differential between the fluid flow path and the flow path generates dynamic axial forces, which can cause axial displacement and vibration in the rotor system. When operating on the ground, these high-speed rotating fluid machinery, along with its rotating components, drive system, and drive connection system, form a complex multi-span shafting structure. In multi-span shafting systems, rotor axial displacement and vibration caused by these forces are typically addressed directly using splined hubs or diaphragm couplings with axial compensation. However, at ultra-high speeds, if splined hubs are used to directly drive the rotating components, the weight of the hubs can negatively impact shafting vibration. Diaphragm couplings can only compensate for small amounts of axial displacement, and when axial displacement is excessive, there is a risk of instability. These factors pose a risk to the shafting system during high-speed operation. Furthermore, high-speed rotating shafting places high demands on rotor alignment. The multi-span structure and high-speed vibration environment pose even greater challenges to shafting alignment. Ensuring proper alignment in multi-span shafting systems at high speeds is currently a challenging engineering challenge, with no optimal solution. Summary of the Invention

[0003] In order to solve the technical problem that the shaft system structure often experiences axial movement and the shaft system alignment is difficult to adapt during high-speed operation, resulting in unreliable operation, the present invention provides a high-speed multi-span transmission shaft system with reliable operation.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

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

[0006] The loading unit includes a cylindrical shell, a drive adapter shaft, a floating bushing, a transition support sleeve, a push-pull force loading mechanism and two annular pressure end covers arranged in the shell;

[0007] An oil supply channel is provided on the side wall of the shell;

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

[0009] The floating bushing is coaxially sleeved on the driving adapter shaft and is rotatably connected to the driving adapter shaft;

[0010] The transition support sleeve is coaxially sleeved outside the floating bushing and is detachably connected to the outer shell. An oil film support gap is provided between the transition support sleeve and the floating bushing. An inwardly concave annular oil cavity is provided around the inner wall of the transition support sleeve. An oil supply throttle hole is also provided along the radial direction thereof, penetrating the inner wall of the annular oil cavity and the outer wall of the transition support sleeve. The oil supply throttle hole is correspondingly connected to the oil supply channel.

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

[0012] One end of the push-pull force loading mechanism is detachably connected to the shell, and the other end is installed on the loading core shaft after passing through the transition support sleeve.

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

[0014] The two annular oil chambers are symmetrically arranged along the 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 hole.

[0015] Furthermore, the transition support sleeve is provided with an annular adjustment cavity with an inner wall thereof for adjusting the axial length of the oil film support, and a first oil return hole is provided along its radial direction, penetrating the inner wall of the annular adjustment cavity and the outer wall of the transition support sleeve;

[0016] The annular adjustment chamber is equidistant from the two annular oil chambers in the axial direction.

[0017] Furthermore, two angular contact bearings are sleeved 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 arranged close to the two pressure end covers;

[0019] The two angular contact bearings are respectively located between the two annular limiting protrusions and the adjacent pressure end covers, and a plurality of wave springs are uniformly distributed circumferentially between each angular contact bearing and the adjacent pressure end cover; an annular gasket is provided between the plurality of wave springs and the angular contact bearings;

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

[0021] Furthermore, the loading unit further comprises a flexible coupling and a spline sleeve;

[0022] The spline sleeve is sleeved on the outside of one end of the drive adapter shaft, and a positioning surface matching the outer surface of one end of the drive adapter shaft is provided on its inner wall. An axial countersunk hole is provided at a position away from the center of one end of the drive adapter shaft, and a spline flange is also provided on the outer wall of this end for connecting with the flange of one end of the flexible coupling;

[0023] A threaded hole is provided on the end surface of the drive adapter shaft for cooperating with the axial countersunk hole, and a connecting center screw is passed 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 coaxially flange-connected to the driving end of the driving shaft.

[0025] Furthermore, the other end of the drive adapter shaft is provided with a return-type 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 comprises a mandrel body and a first annular limiting plate and a second annular limiting plate arranged side by side on the outer wall thereof along the axial direction; reinforcing ribs are provided between the first annular limiting plate and the second annular limiting plate and the mandrel body;

[0027] One end of the core shaft body is sleeved on the other end of the drive adapter shaft and connected to the drive adapter shaft through a return drum-shaped external spline. The other end is provided with a shaft body flange for connecting to the load rotor unit flange.

[0028] Furthermore, the push-pull force loading mechanism includes a push-pull force sliding bearing ring and a plurality of drive assemblies uniformly distributed on the same side of the push-pull force sliding bearing ring in the circumferential direction;

[0029] The push-pull sliding bearing ring is sleeved on the outside of the core shaft body and clamped between the first annular limiting plate and the second annular limiting plate, and a gap is provided between the inner wall of the push-pull sliding bearing ring and the outer wall of the core shaft body;

[0030] The driving assembly includes a loading cylinder whose cylinder body is connected to the housing, a force sensor whose one end is coaxially connected to the driving end of the loading cylinder, a loading rod whose one end is coaxially connected to the other end of the force sensor, and a linear bearing sleeve rotatably sleeved on the outside of the loading rod;

[0031] The linear bearing sleeve is axially arranged on the side wall of the transition support sleeve, and one end of the linear bearing sleeve 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 the cross-section line of the axial outer wall thereof is arc-shaped.

[0034] Furthermore, the load rotor unit includes a rotor, a rotor transition support ring rotatably sleeved on the outside of 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 other end of the core shaft body by a flange of the shaft body;

[0036] The rotor transition support ring is a two-half split rotor assembly, the inner wall of which is rotatably connected to the rotor via a connecting bearing, and one end of its outer wall is flange-connected to the rotor support seat;

[0037] The inner and outer walls of the rotor transition support ring are respectively provided with positioning surfaces that match 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 an adapter shaft support seat fixedly provided in the middle of the shell body and sleeved on the outside of 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 provided on the adapter shaft support seat;

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

[0043] Beneficial effects of the present invention:

[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 coaxially connected in sequence, wherein a floating bushing is provided in the loading unit, and an oil film support gap is provided between the floating bushing and the transition support sleeve. At the same time, an annular oil chamber and an oil supply throttle hole are provided on the transition support sleeve. When the system is working, a pressure oil film for support can be delivered to the oil film support gap through the oil supply throttle hole and the annular oil chamber, so that the transition support sleeve and the outer shell connected to the transition support sleeve, the push-pull force loading mechanism and the drive adapter shaft can be adaptively adjusted to meet the high-precision alignment requirements of the shaft system under high-speed operation environment, thereby improving its operation reliability.

[0045] 2. The present invention provides a high-speed multi-span transmission shaft system with reliable operation. A first oil return hole is also provided in the middle of the transition support sleeve. Through the oil return hole, the axial length of the supporting oil film can be more accurately controlled, so as to more accurately control the centering degree between the transition support sleeve and the drive adapter shaft.

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

[0047] 4. The other end of the drive adapter shaft in the present invention is provided with a return-type drum-shaped external spline around its outer wall. The return-type drum-shaped external spline can improve the adaptability between the loading core shaft and the drive adapter shaft during system operation, further improve the centering degree of the entire system, and at the same time effectively isolate the vibration transmission between the two spans of the rotor.

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

[0049] 6. The present invention provides a high-speed multi-span transmission shaft system with reliable operation, which is also provided with an adapter shaft support seat and a rotor support seat, and the transition support sleeve is flange-connected to the adapter shaft support seat, and the rotor transition support ring is flange-connected to the rotor support seat, which can avoid axial movement during system operation and improve the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0053] Figure 4 2 is a schematic structural diagram of a loading mandrel in an embodiment of the present invention;

[0054] Figure 5 2 is a schematic structural diagram of a push-pull force loading mechanism according to an embodiment of the present invention;

[0055] Figure 6 Schematic diagram of the structure of the rotor transition support ring in an embodiment of the present invention.

[0056] Figure Number:

[0057] 1-drive shaft, 2-flexible coupling, 3-drive adapter shaft, 4-angular contact bearing, 5-pressure end cover, 6-floating bushing, 7-transition support sleeve, 8-adapter shaft support seat, 9-loading mandrel, 10-push-pull force loading mechanism, 11-rotor, 12-rotor transition support ring, 13-rotor support seat, 14-annular oil chamber, 15-oil film support gap, 16-wave spring, 17-oil supply throttle hole, 18-spline sleeve, 19-center Screw, 20-loading cylinder, 21-force sensor, 22-loading rod, 23-linear bearing sleeve, 24-push-pull sliding bearing ring, 25-annular adjustment chamber, 26-first oil return hole, 27-annular limit protrusion, 28-annular gasket, 29-spline flange, 30-returnable drum-shaped external spline, 31-core shaft body, 32-first annular limit plate, 33-second annular limit plate, 34-shaft body flange, 35-connecting bearing. DETAILED DESCRIPTION

[0058] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings and embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0059] The embodiment of the present invention provides a high-speed multi-span transmission shaft system with reliable operation, combined with Figure 1-Figure 3 As shown, the system includes a driving shaft 1; and further includes a loading unit and a load rotor unit sequentially arranged at the driving end of the driving shaft 1.

[0060] 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 force loading mechanism 10, a flexible coupling 2, a spline sleeve 18 and two annular pressure end covers 5 arranged in the outer shell.

[0061] The outer shell includes a cylindrical shell body, and an adapter shaft support seat 8 fixedly penetrated in the middle of the shell body and sleeved on the outside of the transition support sleeve 7; two oil supply channels are provided on the adapter shaft support seat 8; a second oil return hole 36 is also provided on the adapter shaft support seat 8.

[0062] Two pressure end caps 5 are coaxially mounted on the outside of the drive adapter shaft 3 and are located outside the ends of the floating bushing 6 and the transition support sleeve 7. Their outer rings are detachably connected to the transition support sleeve 7, and a gap is provided between their inner walls and the outer wall 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 outer shell, one end of which is coaxially connected to the driving end of the drive shaft 1, and the other end is connected to the load rotor unit through the loading core shaft 9; two annular limit protrusions 27 are provided around the outer wall of the drive adapter shaft 3, and the two annular limit protrusions 27 are symmetrically arranged along the vertical plane of the axis of the floating bushing 6, and the two annular limit protrusions 27 are respectively arranged close to the two pressure end covers 5; the spline sleeve 18 is sleeved on the outside of one end of the drive adapter shaft 3, and a positioning surface matching the outer surface of one end of the drive adapter shaft 3 is provided on its inner wall, and an axial countersunk hole is provided at the center away from one end of the drive adapter shaft 3, and a spline flange 29 is also provided on the outer wall of this end for flange connection with one end of the flexible coupling 2; a threaded hole for matching with the axial countersunk hole is provided on the end face of the drive adapter shaft 3, and a connecting center screw 19 is passed 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 outer shell and is coaxially flange-connected with the driving end of the drive shaft 1. The other end of the drive adapter shaft 3 is provided with a return-type 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 mounted on the drive adapter shaft 3 and rotatably connected to the drive adapter shaft 3. Two angular contact bearings 4 are also mounted between the floating bushing 6 and the drive adapter shaft 3. The two angular contact bearings 4 are respectively located between two annular stop protrusions 27 and the adjacent pressure end cover 5. Multiple wave springs 16 are evenly distributed circumferentially between each angular contact bearing 4 and the adjacent pressure end cover 5. An annular gasket 28 is provided between the multiple wave springs 16 and the angular contact bearings 4. The outer ring of the angular contact bearing 4 is tightly connected to the floating bushing 6, and its inner ring is tightly connected to the drive adapter shaft 3. The pressure end cover 5 uses the circumferentially distributed wave springs 16 to axially preload the angular contact bearings 4.

[0065] The transition support sleeve 7 is coaxially mounted on the floating bushing 6 and removably connected to the adapter shaft support seat 8. An oil film support gap 15 is defined between the transition support sleeve 7 and the floating bushing 6. The total axial length of the oil film support gap 15 is no less than half the axial length of the floating bushing 6. The transition support sleeve 7 is provided with two concave annular oil chambers 14 around its inner wall. Two oil supply orifices 17 are also provided radially through the inner walls of the annular oil chambers 14 and the outer wall of the transition support sleeve 7. The two oil supply orifices 17 are connected to the two oil supply channels in a one-to-one correspondence. The two annular oil chambers 14 are symmetrically arranged along the perpendicular midplane of the axis of the floating bushing 6. The volume of each annular oil chamber 14 is 5-10 times the volume of the corresponding oil supply orifice 17. The transition support sleeve 7 is also provided with an inwardly concave annular adjustment chamber 25 around its inner wall for adjusting the axial length of the oil film support. A first oil return hole 26 is also provided along its radial direction, penetrating the inner wall of the annular adjustment chamber 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 chamber 25 and the two annular oil chambers 14 is equal.

[0066] like Figure 4 As shown, the loading core shaft 9 includes a core shaft body 31 and a first annular limit plate 32 and a second annular limit plate 33 arranged side by side on its outer wall along its axial direction; reinforcing ribs are provided between the first annular limit plate 32 and the second annular limit plate 33 and the core shaft body 31; one end of the core shaft body is sleeved on the outside of the other end of the drive adapter shaft 3, and is connected to the drive adapter shaft 3 through a return drum-shaped external spline 30, and a shaft body flange 34 is provided on the outside of the other end for connection 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 a plurality of drive components uniformly distributed on 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 sleeved on the outside of the core shaft body 31, and is clamped between the first annular limit plate 32 and the second annular limit plate 33, and a gap is provided between the inner wall of the push-pull force sliding bearing ring 24 and the outer wall of the core shaft body 31; the push-pull force sliding bearing ring 24 is a double-sided push-pull force sliding bearing ring, and the cross-section line of its axial outer wall is an arc. The drive assembly includes a loading cylinder 20 connected to the main body of the housing, a force sensor 21 coaxially connected at one end to the driving 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 mounted on the outside of 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 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 sliding bearing ring 24, and the loading mandrel 9. The loading rod 22 passes through the linear bearing sleeve 23 to ensure that the thrust loading direction is along the axial direction of the rotor 11. The push-pull sliding bearing ring 24 does not contact the loading mandrel 9 in the radial direction.

[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 flange-connected to the other end of the core shaft body 31 through a shaft body flange 34; Figure 6 As shown, the rotor transition support ring 12 is a two-part, 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 flange-connected to the rotor support seat 13. Positioning surfaces are provided on the inner and outer walls of the rotor transition support ring 12, respectively, to 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 machining requirements: the split surfaces are machined first, then reassembled, and a positioning device is placed between the two split halves.

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

[0070] The steps for installing and using the above system are as follows:

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

[0072] Step 2: Install the transition support sleeve 7 in 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 install the wave spring 16 at the same time, and tighten the two ends with the pressure end cover 5.

[0074] Step 4: Install the spline sleeve 18 on 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 force loading mechanism 10, and push in the rotor transition support ring 12 and the rotor 11 from the non-drive end. This completes the installation of the entire high-speed multi-span transmission shafting structure.

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

[0077] Step 7: After the operation is completed, the rotor transition support ring 12 and rotor 11 assembly are withdrawn from the non-drive end and removed. The remaining components can remain installed in the same state. The drive adapter shaft 3 and its supporting structure, loading mandrel 9, push-pull force loading mechanism 10, and other components can also be moved or removed 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 shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A high-speed multi-span transmission shaft system with reliable operation, comprising a drive shaft (1); characterized in that: It also includes a loading unit and a load rotor unit which are sequentially arranged at the driving end of the driving shaft (1); The loading unit comprises a cylindrical shell, a drive adapter shaft (3), a floating bushing (6), a transition support sleeve (7), a push-pull force loading mechanism (10) and two annular pressure end covers (5) arranged in the shell; An oil supply channel is provided on the side wall of the shell; 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 of which is connected to the load rotor unit via a loading core shaft (9); The floating bushing (6) is coaxially sleeved on the outside of the drive adapter shaft (3) and is rotatably connected to the drive adapter shaft (3); The transition support sleeve (7) is coaxially sleeved on the outside of the floating bushing (6) and is detachably connected to the outer shell, and an oil film support gap (15) is provided between the transition support sleeve (7) and the floating bushing (6); an inwardly concave annular oil cavity (14) is provided around the inner wall of the transition support sleeve (7), and an oil supply throttle hole (17) is also provided along its radial direction and passes through the inner wall of the annular oil cavity (14) and the outer wall of the transition support sleeve (7), and the oil supply throttle hole (17) is correspondingly communicated with the oil supply channel; The two pressure end covers (5) are respectively coaxially sleeved on the outside of the drive adapter shaft (3) and are respectively located outside the two ends of the floating bushing (6) and the transition support sleeve (7). The outer rings of the pressure end covers are detachably connected to the transition support sleeve (7), and a gap is provided between the inner walls of the pressure end covers and the outer wall of the drive adapter shaft (3); One end of the push-pull force loading mechanism (10) is detachably connected to the housing, and the other end passes through the transition support sleeve (7) and is then installed on the loading core shaft (9).

2. The reliable high-speed multi-span transmission shaft system according to claim 1, characterized in that: Two annular oil chambers (14) are arranged in parallel along the axial direction on the inner wall of the transition support sleeve (7), and two oil supply throttle holes (17) are respectively corresponding to the annular oil chambers (14); The two annular oil chambers (14) are symmetrically arranged along the vertical plane of the axis of the floating bushing (6), 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 transmission shaft system according to claim 2, characterized in that: The transition support sleeve (7) is provided with an annular adjustment cavity (25) around its inner wall for adjusting the axial length of the oil film support, and a first oil return hole (26) is provided along its radial direction and passes through the inner wall of the annular adjustment cavity (25) and the outer wall of the transition support sleeve (7); The annular adjustment chamber (25) is equidistant from the two annular oil chambers (14) in the axial direction.

4. The reliable high-speed multi-span transmission shaft system according to claim 3, characterized in that: Two angular contact bearings (4) are sleeved 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 vertical plane of the axis of the floating bushing (6), and the two annular limiting protrusions (27) are respectively arranged close to the two pressure end covers (5). The two angular contact bearings (4) are respectively located between two annular limiting protrusions (27) and adjacent pressure end covers (5), and a plurality of wave springs (16) are uniformly distributed circumferentially between each angular contact bearing (4) and the adjacent pressure end cover (5); an annular gasket (28) is provided between the plurality of wave springs (16) and the angular contact bearing (4); The outer ring of the angular contact bearing (4) is tightly connected to the floating bushing (6), and the inner ring is tightly connected to the drive adapter shaft (3).

5. The reliable high-speed multi-span transmission shaft system according to claim 4, characterized in that: The loading unit further comprises a flexible coupling (2) and a spline sleeve (18); The spline sleeve (18) is sleeved on the outside of one end of the drive adapter shaft (3), and a positioning surface matching the outer surface of one end of the drive adapter shaft (3) is provided on its inner wall. An axial countersunk hole is provided at a position away from the center of one end of the drive adapter shaft (3). A spline flange (29) is also provided on the outer wall of the end for flange connection with one end of the flexible coupling (2); A threaded hole for cooperating with the axial countersunk hole is provided on the end surface of the drive adapter shaft (3); a connecting center screw (19) is passed 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 flange-connected to the driving end of the driving shaft (1).

6. The reliable high-speed multi-span transmission shaft system according to claim 5, characterized in that: The other end of the drive adapter shaft (3) is provided with a folded-back 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) comprises a mandrel body (31) and a first annular limiting plate (32) and a second annular limiting plate (33) arranged side by side on the outer wall thereof along the axial direction; reinforcing ribs are provided between the first annular limiting plate (32), the second annular limiting plate (33) and the mandrel body (31); One end of the core shaft body is sleeved on the outside of the other end of the drive adapter shaft (3) and is connected to the drive adapter shaft (3) through a return drum-shaped external spline (30). The other end is provided with a shaft body flange (34) for connecting to the load rotor unit flange.

7. The reliable high-speed multi-span transmission shaft system according to claim 6, characterized in that: The push-pull force loading mechanism (10) comprises a push-pull force sliding bearing ring (24) and a plurality of drive components uniformly distributed on the same side of the push-pull force sliding bearing ring (24) in the circumferential direction; The push-pull sliding bearing ring (24) is sleeved outside the core shaft body (31) and clamped between the first annular limiting plate (32) and the second annular limiting plate (33), and a gap is provided between the inner wall of the push-pull sliding bearing ring (24) and the outer wall of the core shaft body (31); The driving assembly comprises a loading cylinder (20) whose cylinder body is connected to the housing, a force sensor (21) whose one end is coaxially connected to the driving end of the loading cylinder (20), a loading rod (22) whose one end is coaxially connected to the other end of the force sensor (21), and a linear bearing sleeve (23) rotatably sleeved on the outside of the loading rod (22); The linear bearing sleeve (23) is axially arranged on the side wall of the transition support sleeve (7), and one end thereof 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).

8. The reliable high-speed multi-span transmission shaft system according to claim 7, characterized in that: The push-pull sliding bearing ring (24) is a double-sided push-pull sliding bearing ring, and the cross-sectional line of the axial outer wall thereof is arc-shaped.

9. The reliable high-speed multi-span transmission shaft system according to claim 8, characterized in that: The load rotor unit comprises a rotor (11), a rotor transition support ring (12) rotatably mounted outside 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 flange-connected to the other end of the core shaft body (31) via a shaft body flange (34); The rotor transition support ring (12) is a two-half split rotary body assembly, the inner wall of which is rotatably connected to the rotor (11) via a connecting bearing (35), and one end of its outer wall is flange-connected to the rotor support seat (13); The inner and outer walls of the rotor transition support ring (12) are respectively provided with positioning surfaces that match the outer wall of the connecting bearing (35) and the inner wall of the rotor support seat (13).

10. The reliable high-speed multi-span transmission shaft system according to any one of claims 3 to 9, characterized in that: The outer shell comprises a cylindrical shell body, and a transfer shaft support seat (8) fixedly arranged in the middle of the shell body and sleeved on the outside of 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 arranged on the adapter shaft support seat (8); The adapter shaft support seat (8) is also provided with a second oil return hole (36) corresponding to the first oil return hole (26).

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