Active vibration reduction thrust bearing based on air spring

Abstract

The invention relates to the technical field of ship propulsion system equipment, in particular to an active vibration reduction thrust bearing based on an air spring. Through the low-rigidity design of the air bag vibration isolation elements, ultralow-frequency control over longitudinal vibration of the propeller shaft system can be achieved, the longitudinal vibration of the propeller shaft system is controlled to be expanded within the ultralow-frequency range of 5 Hz, and longitudinal vibration transmission of a shaft system can be effectively isolated; by means of displacement monitoring and active thrust control, effective transmission of shaft system thrust is achieved, the problem that shaft system operation displacement is too large due to low-rigidity design of vibration isolation elements can be avoided, and operation safety of a paddle shaft system is guaranteed; the active vibration reduction thrust bearing is good in vibration reduction effect, suitable for various ship propeller shaft systems, especially suitable for special deep water submersible vehicles, and has certain reference value for axial vibration reduction of rotating machinery or systems in the same axial hydrostatic load state.

Description

Technical Field

[0001] The present invention relates to the technical field of ship propulsion system equipment, and in particular to an active vibration-reducing thrust bearing based on an air spring. Background Art

[0002] The longitudinal vibration of the propulsion system is one of the important sources of low-frequency vibration noise at the stern of the ship. In order to improve the comfort and acoustic stealth of the ship, the longitudinal vibration of the propulsion system and its coupled vibration with the stern structure of the hull must be controlled. The propulsion force transmission channel of the ship's shaft system is also the propeller pulsation excitation force transmission channel. Therefore, the longitudinal vibration reduction of the shaft system generally sets a vibration damper on its thrust transmission channel, and uses the stiffness and damping effect of the vibration damper to attenuate the longitudinal vibration of the shaft system.

[0003] The thrust bearing is a device in the ship propulsion system. It transmits the torque of the shaft system in both positive and negative directions to the propeller, and transmits the thrust and tension generated by the propeller to the hull to propel the submarine to sail. Setting a vibration reduction structure inside the thrust bearing to reduce the longitudinal vibration of the shaft system is an effective control measure in engineering.

[0004] At present, the design of the vibration-damping thrust bearing in the existing technology has certain design drawbacks: in order to ensure the longitudinal vibration reduction effect of the propeller shaft system, the vibration-damping element in the design must have a low thrust stiffness, but because the vibration-damping element is set between the load-bearing components, it needs to withstand huge static loads while isolating vibrations. The large load and low stiffness bring great difficulties to the vibration-damping element in terms of load-bearing performance and reliability, and also greatly increase the axial movement of the propeller shaft system under thrust load, which is extremely unfavorable to the safe use of related equipment such as sealing devices, couplings, and gearboxes.

[0005] According to the single degree of freedom system vibration control theory, the improvement of the longitudinal vibration reduction effect of the shaft system is based on the reduction of the stiffness of the vibration reduction element, thereby achieving the reduction of the first-order natural frequency of the shaft system and achieving the purpose of reducing the vibration response of the control target channel. However, the contradiction between the low dynamic stiffness, high load-bearing capacity and low longitudinal displacement of the existing vibration reduction technology has become a bottleneck of the shaft system vibration reduction technology, limiting the low-frequency vibration reduction control range and use effect of the propeller shaft system. Summary of the invention

[0006] The technical problem to be solved by the present invention is: to propose an active vibration-damping thrust bearing based on an air spring, which can realize ultra-low frequency control of the longitudinal vibration of the propeller shaft system, expand the range of low-frequency vibration reduction control of the propeller shaft system, and avoid excessive displacement of the shaft system during operation, thereby ensuring the safe operation of the propeller shaft system.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] An active vibration-reducing thrust bearing based on an air spring, comprising a thrust shaft 1 and a housing 3, wherein the thrust shaft 1 is passed through the center line of the housing 3 and both ends are located outside the housing 3, a thrust ring 18 is fixed to the thrust shaft 1, the thrust ring 18 is located inside the housing 3 and close to the left end face of the housing 3, a support collar 5 with matching size is provided on the right end face of the thrust ring 18, and a plurality of thrust blocks 4 are evenly arranged along the circumferential direction between the support collar 5 and the thrust ring 18, a support bush 7 is installed in the center hole of the support collar 5, and the support bush 7 is movably sleeved on the thrust shaft 1;

[0009] A plurality of air spring damping assemblies 6 are circumferentially arranged inside the support collar 5, and the plurality of air spring damping assemblies 6 correspond to the plurality of thrust blocks 4 in position; the left end face of the air spring damping assembly 6 abuts against the corresponding thrust block 4, and an adjustment pad 16 is arranged between the right end face of the air spring damping assembly 6 and the inner wall of the support collar 5 for axial compression and limiting; the left side wall of the thrust block 4 contacts the right end face of the thrust ring 18, and a spherical pressure head 17 is arranged on the right end face of the thrust block 4 to abut against the corresponding air spring damping assembly 6;

[0010] The left and right end faces of the housing 3 are both installed with end face oil seals 2, the air spring damping assemblies 6 are connected to the high-pressure air system through an air supply pipeline 8, and an air pressure control module 10 is installed on the air supply pipeline 8, and a displacement monitoring sensor 9 is installed on the end face of the thrust shaft 1, and the displacement monitoring sensor 9 and the air pressure control module 10 are both electrically connected to the thrust monitoring control module 11.

[0011] Furthermore, the air spring damping assembly 6 includes a spring cylinder 12, an air diaphragm 13 and a support block 14. The outer cylindrical surface of the air diaphragm 13 is fixed to the left end surface of the spring cylinder 12 by a fastener 15. The inner cavity of the spring cylinder 12 is connected to the air supply pipeline 8 to form an air chamber. The support block 14 is connected to the middle part of the outer side of the air diaphragm 13.

[0012] Furthermore, a boss-shaped metal structure is connected to the middle of the outer side of the air diaphragm 13 , and the support block 14 is fixedly installed on the top of the boss-shaped metal structure, and the support block 14 abuts against the corresponding thrust block 4 .

[0013] Furthermore, when the thrust bearing is working, air is inflated into the air chamber through the air supply pipeline 8, so that the air diaphragm 13 expands and drives the boss-shaped metal structure and the support block 14 thereon to press against the corresponding thrust block 4 to realize the bearing function.

[0014] Furthermore, the displacement monitoring sensor 9 is used to monitor the longitudinal displacement of the thrust shaft 1 in real time. When the longitudinal displacement of the thrust shaft 1 approaches the limit allowable displacement, the thrust monitoring control module 11 sends a pressurization instruction to the air pressure control module 10, and the air pressure control module 10 controls the air supply pipeline 8 to pressurize the air spring damping assembly 6.

[0015] Furthermore, when the longitudinal displacement of the thrust shaft 1 returns to a safe operating range, the thrust monitoring control module 11 sends a stop instruction to the air pressure control module 10 to stop charging the air spring damping assembly 6 .

[0016] Furthermore, the inflation pressure P of the air spring damping assembly 6 satisfies the following formula:

[0017]

[0018] In the formula, F 静 is the hydrostatic force of the shaft penetration part, F 动 is the thrust generated by the shaft propeller, S is the effective cross-sectional area of ​​the air diaphragm, and n is the number of air spring damping assemblies.

[0019] Furthermore, the boss-shaped metal structure passes through the supporting collar 5 to the left and is fixedly connected to the supporting block 14 , and the left end surface of the supporting block 14 abuts against the spherical pressure head 17 provided on the right end surface of the thrust block 4 .

[0020] Furthermore, a preset gap is left between the right end face of the support block 14 and the support collar 5 . When the longitudinal displacement of the shaft system is greater than the preset gap, the right end face of the support block 14 is in rigid contact with the support collar 5 .

[0021] Compared with the prior art, the present invention has the following main advantages:

[0022] 1. The active vibration-damping thrust bearing based on air spring proposed in the present invention can realize ultra-low frequency control of the longitudinal vibration of the propeller shaft system through the low stiffness design of the airbag vibration isolation element, so that the longitudinal vibration control of the propeller shaft system is extended to the ultra-low frequency range within 5 Hz, and the longitudinal vibration transmission of the shaft system can be effectively isolated;

[0023] 2. The present invention realizes the effective transmission of shaft system thrust through displacement monitoring and active thrust control, and can avoid the problem of excessive displacement of the shaft system caused by the low stiffness design of the vibration isolation element, thereby ensuring the safe operation of the propeller shaft system;

[0024] 3. The active vibration-damping thrust bearing of the present invention has good vibration-damping effect and is suitable for various ship propeller shaft systems, especially for special deep-water submersibles. It also has certain reference value for axial vibration reduction of rotating machinery or systems under the same axial hydrostatic load state. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of an active vibration-damping thrust bearing based on an air spring of the present invention;

[0026] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0027] Figure 3 is a schematic diagram of an air spring vibration reduction assembly of the present invention;

[0028] Figure 4 It is a schematic diagram of the thrust monitoring control module of the present invention.

[0029] In the figure: 1-thrust shaft, 2-end oil seal, 3-housing, 4-thrust block, 5-support collar, 6-air spring vibration reduction assembly, 7-support bearing, 8-air supply pipeline, 9-displacement monitoring sensor, 10-air pressure control module, 11-thrust monitoring control module, 12-spring cylinder, 13-air diaphragm, 14-support block, 15-fastener, 16-adjusting pad, 17-spherical pressure head, 18-thrust ring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0032] Embodiment 1: This embodiment provides an active vibration-damping thrust bearing based on an air spring, such as Figures 1 to 4 As shown, it includes a thrust shaft 1 and a housing 3, wherein the thrust shaft 1 is passed through along the center line of the housing 3 and both ends are located outside the housing 3, a thrust ring 18 is fixed on the thrust shaft 1, the thrust ring 18 is located inside the housing 3 and close to the left end face of the housing 3, a support collar 5 with matching size is provided on the right end face of the thrust ring 18, and a plurality of thrust blocks 4 are evenly arranged along the circumferential direction between the support collar 5 and the thrust ring 18, a support bearing 7 is installed in the center hole of the support collar 5, and the support bearing 7 is movably sleeved on the thrust shaft 1;

[0033] A plurality of air spring damping assemblies 6 are circumferentially arranged inside the support collar 5, and the plurality of air spring damping assemblies 6 correspond to the plurality of thrust blocks 4 in position; the left end face of the air spring damping assembly 6 abuts against the corresponding thrust block 4, and an adjustment pad 16 is arranged between the right end face of the air spring damping assembly 6 and the inner wall of the support collar 5 for axial compression and limiting; the left side wall of the thrust block 4 contacts the right end face of the thrust ring 18, and a spherical pressure head 17 is arranged on the right end face of the thrust block 4 to abut against the corresponding air spring damping assembly 6;

[0034] The left and right end faces of the housing 3 are both installed with end face oil seals 2, the air spring damping assemblies 6 are connected to the high-pressure air system through an air supply pipeline 8, and an air pressure control module 10 is installed on the air supply pipeline 8, and a displacement monitoring sensor 9 is installed on the end face of the thrust shaft 1, and the displacement monitoring sensor 9 and the air pressure control module 10 are both electrically connected to the thrust monitoring control module 11.

[0035] Furthermore, the air spring damping assembly 6 includes a spring cylinder 12, an air diaphragm 13 and a support block 14. The outer cylindrical surface of the air diaphragm 13 is fixed to the left end surface of the spring cylinder 12 by a fastener 15. The inner cavity of the spring cylinder 12 is connected to the air supply pipeline 8 to form an air chamber. The support block 14 is connected to the middle part of the outer side of the air diaphragm 13.

[0036] Furthermore, a boss-shaped metal structure is connected to the middle of the outer side of the air diaphragm 13 , and the support block 14 is fixedly installed on the top of the boss-shaped metal structure, and the support block 14 abuts against the corresponding thrust block 4 .

[0037] Furthermore, when the thrust bearing is working, air is inflated into the air chamber through the air supply pipeline 8, so that the air diaphragm 13 expands and drives the boss-shaped metal structure and the support block 14 thereon to press against the corresponding thrust block 4 to realize the bearing function.

[0038] Furthermore, the displacement monitoring sensor 9 is used to monitor the longitudinal displacement of the thrust shaft 1 in real time. When the longitudinal displacement of the thrust shaft 1 approaches the limit allowable displacement, the thrust monitoring control module 11 sends a pressurization instruction to the air pressure control module 10, and the air pressure control module 10 controls the air supply pipeline 8 to pressurize the air spring damping assembly 6.

[0039] Furthermore, when the longitudinal displacement of the thrust shaft 1 returns to a safe operating range, the thrust monitoring control module 11 sends a stop instruction to the air pressure control module 10 to stop charging the air spring damping assembly 6 .

[0040] Furthermore, the inflation pressure P of the air spring damping assembly 6 satisfies the following formula:

[0041]

[0042] In the formula, F 静 is the hydrostatic force of the shaft penetration part, F 动 is the thrust generated by the shaft propeller, S is the effective cross-sectional area of ​​the air diaphragm, and n is the number of air spring damping assemblies.

[0043] Furthermore, the boss-shaped metal structure passes through the supporting collar 5 to the left and is fixedly connected to the supporting block 14 , and the left end surface of the supporting block 14 abuts against the spherical pressure head 17 provided on the right end surface of the thrust block 4 .

[0044] Furthermore, a preset gap is left between the right end face of the support block 14 and the support collar 5 . When the longitudinal displacement of the shaft system is greater than the preset gap, the right end face of the support block 14 is in rigid contact with the support collar 5 .

[0045] Embodiment 2: This embodiment provides an active vibration-damping thrust bearing based on an air spring, which mainly includes: a thrust shaft 1, an end oil seal 2, a housing 3, a thrust block 4, a support ring 5, an air spring vibration-damping assembly 6, a support bearing 7, an air supply line 8, a displacement monitoring sensor 9, an air pressure control module 10, a thrust monitoring control module 11 and other components.

[0046] Specifically, the housing 3 is the supporting base of other components, the supporting collar 5 is installed in the housing, the supporting bushing 7 is installed in the inner hole of the supporting collar 5, and the thrust shaft 1 is pressed on the supporting bushing 7, thereby realizing the bearing of the weight load of the thrust shaft; the air spring damping assembly 6 is installed in the inner hole of the supporting collar 5, and the back side is pressed by adjusting the pad 16, and the air spring damping assembly 6 is limited. The thrust block 4 is installed in the groove of the supporting collar 5, and the outer circle is supported on the housing 3. The bushing surface of the thrust block 4 contacts the disk surface of the thrust shaft 1, and the reverse side is a spherical pressure head 17 pressing on the air spring damping assembly 6.

[0047] Furthermore, the thrust block 4 and the air spring damping assembly 6 are installed in the support collar 5 and arranged between the support collar 5 and the thrust shaft 1; the support bearing shell 7 is installed in the inner hole of the support collar 5, and the thrust shaft 1 is placed inside the bearing shell; the thrust shaft 1, the thrust block 4, the support collar 5, the air spring damping assembly 6, and the support bearing shell 7 are all installed in the housing 3; the thrust block 4 and the air spring damping assembly 6 are composed of eight or six pieces, which are evenly distributed along the circumference of the axis; end face oil seals 2 are installed at both ends of the housing 3, and the air spring damping assembly 6 is connected to the high-pressure air system through the air supply pipeline 8, and the air supply pressure is controlled by the thrust monitoring control module 11 to realize the thrust adjustment of the air spring damping assembly 6.

[0048] During the operation of the shaft system, the propeller pushes the thrust shaft 1, causing it to press against the thrust block 4, and then press against the air spring damping assembly 6. The air spring damping assembly 6 generates reverse thrust due to the internal air pressure in the inflated state, and bears the shaft system operation thrust transmitted from the thrust block 4, thereby realizing the sequential transmission of the shaft system thrust from the thrust shaft 1, the thrust block 4, the air spring damping assembly 6, the shell 7 and other components, and finally transmitting it to the hull structure.

[0049] Furthermore, the air spring damping assembly 6 includes a spring cylinder 12, an air diaphragm 13, a support block 14, a fastener 15 and other components. The air diaphragm 13 is arranged on the end cover of the spring cylinder 12, and the support block 14 is arranged on the other side. The air spring damping assembly 6 has a stiffness characteristic during the load-bearing process, which can attenuate the pulsating force component in the propeller excitation force and realize the function of longitudinal vibration reduction of the shaft system.

[0050] The spring cylinder 12 is a barreled cylindrical structure, one end of which is closed and the other end is pressed by an air diaphragm 13. The air chamber of the air spring is formed in the cavity between the spring cylinder 12 and the air diaphragm 13. A boss-shaped metal structure is vulcanized on the outside of the air diaphragm 13, and a support block 14 is installed on the boss of the metal structure to serve as a force support point for the thrust block 4. When the thrust bearing is working, the air chamber is inflated by an air pipeline, which will expand the air diaphragm 13, drive the metal structure and the support block 14 thereon, and push the thrust block 4 in reverse to achieve the bearing function.

[0051] Furthermore, the thrust monitoring control module 11 monitors the displacement of the shaft system through the displacement monitoring sensor 9. When it is found that the longitudinal displacement of the shaft system is close to the limit allowable displacement, the thrust monitoring control module 11 controls the air pressure control module 10 to charge the air spring damping assembly 6 to increase the internal air pressure, thereby pushing the thrust block 4 to move in the opposite direction of the thrust, thereby pushing the shaft system to reduce the longitudinal displacement and realize the thrust bearing of the shaft system.

[0052] Furthermore, the relationship between the shaft thrust and the thrust bearing active thrust balance mechanical parameters is:

[0053] 1) Shaft thrust F 推 =F 静 +F 动 , F 静 is the hydrostatic force of the shaft penetration part, F 动 The thrust generated by the propeller;

[0054] 2) F generated by several air spring damping components 6 of the thrust bearing ’ =nPS, s is the effective cross-sectional area of ​​the air diaphragm 13, P is the internal inflation pressure of the air spring, which is provided by the air pressure control module 10, and n is the number of air spring damping components in the thrust bearing;

[0055] 3) To achieve the transmission of the longitudinal thrust of the shaft system, it is necessary to ensure F 推 =F ’ .

[0056] Furthermore, the dynamic excitation force generated during the operation of the propeller shaft system is transmitted to the support block 14 through the thrust shaft and the thrust block, and then transmitted to the shell 3 through the air diaphragm 13, and then transmitted to the hull structure. The air spring vibration reduction assembly 6 has a stiffness characteristic during the load-bearing process, which can attenuate the pulsating force component in the propeller excitation force and realize the function of longitudinal vibration reduction of the shaft system. The thrust generated by the propeller is borne by the air diaphragm 13 of the air spring vibration reduction assembly 6, and the vibration is transmitted. The elastic stiffness of several air diaphragms 13 in the inflated state constitutes the longitudinal stiffness of the thrust bearing, and the air diaphragm 13 relies on the expansion force of the diaphragm under air pressure to achieve stiffness transmission. It has a lower compression stiffness than ordinary mechanical springs, and the stiffness can also be controlled by the inflation pressure to obtain a lower overall stiffness. With the help of the low stiffness characteristics of the air spring vibration reduction assembly 6, the longitudinal vibration control of the shaft system can be extended to an ultra-low frequency band within 5Hz through the stiffness design of the vibration reduction element.

[0057] Furthermore, the outer diameter of the support block 14 is larger than the inner diameter of the support collar 5 where the air spring vibration reduction assembly 6 passes through the support collar 5, and a certain gap is set between the support collar 5. When the longitudinal displacement of the shaft system is larger than the gap, the end face of the support block 14 is in rigid contact with the support collar 5, and the vibration reduction effect of the vibration reduction thrust bearing disappears at this time, but the thrust stop function of the bearing is still effective. This design avoids the influence of excessive longitudinal displacement of the shaft system on the safety of the system equipment.

[0058] Furthermore, the displacement monitoring sensor 9 collects the longitudinal displacement of the shaft system during operation, and the thrust monitoring control module 11 monitors the displacement value in real time and adjusts the longitudinal displacement of the shaft system by active control to ensure that the longitudinal displacement of the shaft system does not exceed the use limit. The control method is: when it is detected that the longitudinal displacement of the shaft system is close to the allowable range, the thrust monitoring control module 11 controls the air pressure control module 10 to charge the air spring damping assembly 6 to increase the internal air pressure, push the thrust block 4 to move in the opposite direction of the thrust of the thrust shaft 1, and then push the shaft system to reduce the longitudinal displacement; when it is detected that the longitudinal displacement of the shaft system has returned to the safe use range, the thrust monitoring control module 11 controls the air pressure control module 10 to close and keep the pressure in the air spring damping assembly 6 stable.

[0059] Furthermore, all parts involved in this application that are not described in detail are the same as the prior art or are implemented using the prior art.

[0060] In summary:

[0061] 1. The active vibration-damping thrust bearing based on air spring proposed in the present invention can realize ultra-low frequency control of the longitudinal vibration of the propeller shaft system through the low stiffness design of the airbag vibration isolation element, so that the longitudinal vibration control of the propeller shaft system is extended to the ultra-low frequency range within 5 Hz, and the longitudinal vibration transmission of the shaft system can be effectively isolated;

[0062] 2. The present invention realizes the effective transmission of shaft system thrust through displacement monitoring and active thrust control, and can avoid the problem of excessive displacement of the shaft system caused by the low stiffness design of the vibration isolation element, thereby ensuring the safe operation of the propeller shaft system;

[0063] 3. The active vibration-damping thrust bearing of the present invention has good vibration-damping effect and is suitable for various ship propeller shaft systems, especially for special deep-water submersibles. It also has certain reference value for axial vibration reduction of rotating machinery or systems under the same axial hydrostatic load state.

[0064] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An active vibration-damping thrust bearing based on air springs, It is characterized in that The invention comprises a thrust shaft (1) and a housing (3), wherein the thrust shaft (1) is passed through the center line of the housing (3) and both ends are located outside the housing (3), a thrust ring (18) is fixed on the thrust shaft (1), the thrust ring (18) is located inside the housing (3) and close to the left end face of the housing (3), a support collar (5) of matching size is provided on the right end face of the thrust ring (18), and a plurality of thrust blocks (4) are evenly arranged along the circumferential direction between the support collar (5) and the thrust ring (18), a support bearing (7) is installed in the center hole of the support collar (5), and the support bearing (7) is movably sleeved on the thrust shaft (1); A plurality of air spring damping assemblies (6) are circumferentially arranged inside the support collar (5), and the plurality of air spring damping assemblies (6) correspond to the plurality of thrust blocks (4) in position; the left end face of the air spring damping assembly (6) abuts against the corresponding thrust block (4), and an adjustment pad (16) is arranged between the right end face of the air spring damping assembly (6) and the inner wall of the support collar (5) for axial compression and limiting; the left side wall of the thrust block (4) contacts the right end face of the thrust ring (18), and a spherical pressure head (17) is arranged on the right end face of the thrust block (4) to abut against the corresponding air spring damping assembly (6); The left and right end faces of the housing (3) are both installed with end face oil seals (2); the air spring damping components (6) are connected to a high-pressure air system via an air supply pipeline (8), and an air pressure control module (10) is installed on the air supply pipeline (8); a displacement monitoring sensor (9) is installed on the end face of the thrust shaft (1); and the displacement monitoring sensor (9) and the air pressure control module (10) are both electrically connected to a thrust monitoring control module (11).

2. An active vibration-damping thrust bearing based on an air spring according to claim 1, It is characterized in that The air spring damping assembly (6) comprises a spring cylinder (12), an air diaphragm (13) and a support block (14); the outer circumferential surface of the air diaphragm (13) is fixed to the left end surface of the spring cylinder (12) by a fastener (15); the inner cavity of the spring cylinder (12) is connected to the air supply pipeline (8) to form an air chamber; the middle part of the outer side of the air diaphragm (13) is connected to the support block (14).

3. An active vibration-damping thrust bearing based on an air spring according to claim 2, It is characterized in that A boss-shaped metal structure is connected to the middle of the outer side of the air diaphragm (13), the support block (14) is fixedly mounted on the top of the boss-shaped metal structure, and the support block (14) abuts against the corresponding thrust block (4).

4. An active vibration-damping thrust bearing based on an air spring according to claim 3, It is characterized in that When the thrust bearing is working, air is inflated into the air chamber through the air supply pipeline (8), so that the air diaphragm (13) expands and drives the boss-shaped metal structure and the support block (14) thereon to press against the corresponding thrust block (4) to realize the bearing function.

5. The active vibration-damping thrust bearing based on an air spring according to claim 1, It is characterized in that The displacement monitoring sensor (9) is used to monitor the longitudinal displacement of the thrust shaft (1) in real time. When the longitudinal displacement of the thrust shaft (1) approaches the limit allowable displacement, the thrust monitoring control module (11) sends a pressurization instruction to the air pressure control module (10), and the air pressure control module (10) controls the air supply pipeline (8) to pressurize the air spring damping assembly (6).

6. An active vibration-damping thrust bearing based on an air spring according to claim 5, It is characterized in that When the longitudinal displacement of the thrust shaft (1) returns to a safe operating range, the thrust monitoring control module (11) sends a stop command to the air pressure control module (10) to stop charging the air spring damping assembly (6).

7. An active vibration-damping thrust bearing based on an air spring according to claim 4, It is characterized in that The inflation pressure P of the air spring damping assembly (6) satisfies the following formula: In the formula, F 静 is the hydrostatic force of the shaft penetration part, F 动 is the thrust generated by the shaft propeller, S is the effective cross-sectional area of ​​the air diaphragm, and n is the number of air spring damping assemblies.

8. The active vibration-damping thrust bearing based on an air spring according to claim 3, It is characterized in that The boss-shaped metal structure passes through the support collar (5) to the left and is fixedly connected to the support block (14), and the left end surface of the support block (14) abuts against a spherical pressure head (17) provided on the right end surface of the thrust block (4).

9. An active vibration-damping thrust bearing based on an air spring according to claim 8, It is characterized in that A preset gap is left between the right end face of the support block (14) and the support collar (5); when the longitudinal displacement of the shaft system is greater than the preset gap, the right end face of the support block (14) is in rigid contact with the support collar (5).

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