A three-dimensional combined vibration isolation device based on adjustable damping magneto-rheological vibration absorber

Abstract

The application provides a three-way combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber, which is connected with an air compressor, and comprises a blade for stirring a magnetic fluid; when the vibration isolation device is vibrated, energy is dissipated through stirring of the magnetic fluid by the blade to inhibit vibration amplitude transmitted to the lower layer of the vibration isolator; the vibration isolation device adjusts the damping effect by changing the angle of the blade for stirring the magnetic fluid, or changes the viscosity of the magnetic fluid according to the change of the rotating speed of the air compressor, thereby forming a wide frequency range and adjustable damping control; the application can change the viscosity of the magnetic fluid according to the change of the rotating speed of the variable frequency air compressor while having the fluid vibration absorption and metal rubber vibration absorption capacity, thereby obtaining a wide frequency range and adjustable damping control effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration isolation and noise reduction and air compressor, and particularly relates to a three-way combined vibration isolation device based on an adjustable damping magneto-rheological vibration absorber. BACKGROUND

[0002] In recent years, the variable frequency screw compressor has brought new challenges to the noise reduction of the compressor while improving the part load performance and increasing the compressor efficiency. On the one hand, the variable frequency screw compressor has high operating speed and large noise, which seriously deteriorates the noise problem of the compressor. On the other hand, the variable frequency screw compressor has a wide operating speed range, and at certain speeds, fluid-structure coupling resonance may occur, which amplifies the noise of the compressor and reduces the reliability of the compressor. Researchers have conducted experimental research on the influence of the operating speed of the screw air compressor on the exhaust pressure pulsation characteristics, and the results show that as the speed of the compressor increases, the amplitude of the exhaust gas flow pulsation rises, and the vibration noise significantly increases. Therefore, how to control and solve the noise problem of the compressor has become a major technical problem in the research and application of the variable frequency screw compressor.

[0003] Metal rubber, also known as metal micro-porous winding structure, is a kind of metal elastic porous material. The interpenetrating spiral metal wires form a space network structure. Thanks to its excellent environmental adaptability and damping capacity, metal rubber has been widely used in the fields of aerospace and national defense weapons and equipment.

[0004] The mechanical properties of the new intelligent magneto-rheological material can change according to the change of the external magnetic field, and it has the characteristics of fast response speed and good reversibility. Magneto-rheological fluid is one of the magneto-rheological materials.

[0005] Under this background, the present application provides a three-way combined vibration isolation device based on an adjustable damping magneto-rheological vibration absorber, which combines the energy dissipation characteristics of metal rubber and magnetic fluid and can adapt to more variable working environments. When the vibration isolation device is subjected to vibration, the energy can be dissipated by stirring the magnetic fluid to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator. In addition, the angle of the stirring magnetic fluid blade can be changed to obtain different damping effects. The biggest advantage of this device is that it has the ability of fluid vibration absorption and metal rubber vibration absorption, and can change the viscosity of the magnetic fluid according to the change of the speed of the variable frequency air compressor, thereby obtaining a wide frequency range and adjustable damping control effect. SUMMARY

[0006] The present application provides a three-way combined vibration isolation device based on an adjustable damping magneto-rheological vibration absorber, which has the ability of fluid vibration absorption and metal rubber vibration absorption, and can change the viscosity of the magnetic fluid according to the change of the speed of the variable frequency air compressor, thereby obtaining a wide frequency range and adjustable damping control effect.

[0007] The application adopts the following technical solutions.

[0008] A three-direction combined vibration isolation device based on an adjustable damping magneto-rheological vibration absorber, which is connected with an air compressor, comprises a blade for stirring magnetic fluid, when the vibration isolation device is vibrated, the energy is dissipated by stirring the magnetic fluid through the blade to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator; the vibration isolation device adjusts the damping effect by changing the angle of the blade for stirring the magnetic fluid, or changes the viscosity of the magnetic fluid according to the change of the rotating speed of the air compressor, forming a wide frequency range and adjustable damping control.

[0009] The vibration isolation device comprises a bearing platform (4) for connecting the air compressor (1); the blade (508) for stirring the magnetic fluid is arranged in the magnetic fluid pool below the bearing platform, the blade is arranged at the rotor (505) in the magnetic fluid pool, the rotor is connected with the threads of the shell (514) of the magnetic fluid pool through the threads with a preset length and forms a threaded pair, when the bearing platform pushes and lifts the rotor connected therewith, the threaded pair rotates the rotor, and the blade stirs the magnetic fluid in the magnetic fluid pool.

[0010] The threads of the shell of the magnetic fluid pool are provided below a boss (510), the lower part of the rotor is connected with the boss through an angular contact ball bearing B (509), and the upper part of the rotor is connected with the bearing platform through an angular contact ball bearing A (501);

[0011] When the vibration absorbing frequency needs to be adjusted, the rotating speed and the moving distance of the rotor are adjusted by adjusting the pitch and the length of the threaded pair, so as to obtain different damping effects.

[0012] The rotor is assembled at the inner ring of the angular contact ball bearing, and the bearing platform has an axial shoulder for positioning the angular contact ball bearing.

[0013] The magnetic fluid pool is surrounded by the top cover (503) below the bearing platform and the shell, and a preset amount of magnetic fluid is arranged in the magnetic fluid pool.

[0014] The shell is covered with a top cover, and a rubber ring for positioning the electromagnetic coil is pressed below the top cover.

[0015] The end face of the boss is assembled with a spring (511), and the spring is fixed on the bottom cover of the vibration isolation device and can be stretched and contracted.

[0016] The boss is internally provided with a groove connected with a guide platform (512), and the guide platform is connected with a metal rubber part (513) fixed in the circular groove of the bottom cover.

[0017] The spring is a spatially arranged omnidirectional vibration isolation structure, and the stiffness of the vibration isolation device is changed by replacing springs with different stiffnesses, so as to obtain different vibration isolation effects.

[0018] The bottom cover is connected with the shell of the vibration isolation device below the bearing platform; the shell of the vibration isolation device is internally provided with a controller and an electromagnetic coil; the controller is connected with the electromagnetic coil through wires.

[0019] The magnetic fluid pool is arranged in the magnetic field range of the electromagnetic coil, and a data line groove is arranged at the shell for connecting the controller with the air compressor speed controller through a data line (9);

[0020] The controller changes the magnetic field strength by changing the current size of the electromagnetic coil according to the speed of the air compressor, thereby affecting the viscosity of the magnetic fluid, so that the vibration absorption frequency of the vibration isolation device changes with the change of the frequency conversion air compressor speed, and the vibration absorption frequency of the vibration isolation device is steplessly adjusted by adjusting the magnetic field strength of the electromagnetic coil.

[0021] The angular contact ball bearing comprises an angular contact ball bearing A (501) and an angular contact ball bearing B (509), and the rotor is provided with shaft shoulders for positioning the angular contact ball bearing A and the angular contact ball bearing B respectively.

[0022] The rotor is provided with a triangular protrusion for limiting; the shell is provided with a protruding section and an inclined surface for cooperating with the triangular protrusion on the rotor to limit the rotor.

[0023] When the vibration isolation device works, the vibration is transmitted from the air compressor to the vibration isolation device, and when the vibration isolation device is subjected to vibration, the vibration force is transmitted to the bearing platform, the bearing platform drives the rotor to move longitudinally through the angular contact ball bearing A, and at the same time, the rotor is rotated when moving longitudinally through the spiral pair cooperation between the rotor and the shell, the rotor drives the blades to stir the magnetic fluid in the pool, and through the damping effect of the magnetic fluid, the energy conversion and dissipation are realized to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator;

[0024] The vibration force is also transmitted to the boss through the angular contact ball bearing B to make the boss longitudinally displace, and the boss presses the spring and the guide platform; the spring has an included angle with the horizontal plane to absorb vibrations in all directions; after the spring is compressed, the boss continues to move downward to drive the guide platform to press the metal rubber part below the guide platform, and the metal rubber part generates heat through the friction between the metal wires in the metal rubber part in the vibration to dissipate the vibration. The air compressor is a frequency conversion air compressor, when the speed of the air compressor changes, a signal is transmitted to the controller through the data line, the controller changes the current size of the electromagnetic coil according to the signal, the magnetic field in the electromagnetic coil is changed, and then the viscosity of the magnetic fluid in the magnetic fluid pool is changed to affect the damping of the magnetic fluid stirred by the blades rotating at the rotor, so that the vibration absorption frequency of the vibration isolation device is automatically adjusted with the change of the speed of the frequency conversion air compressor, thereby realizing more accurate vibration isolation and control.

[0025] This invention proposes a three-dimensional combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber. Combining the energy dissipation characteristics of metal rubber and magnetorheological fluid, it can adapt to more varied working environments. When the vibration isolation device is subjected to vibration, the energy is dissipated by agitating the magnetorheological fluid, suppressing the vibration amplitude transmitted to the lower layer of the isolator. Furthermore, different vibration reduction effects can be obtained by changing the angle of the agitating magnetorheological fluid blades. The greatest advantage of this device is that while simultaneously possessing the vibration absorption capabilities of fluid and metal rubber, it can also change the viscosity of the magnetorheological fluid according to the change in the speed of the variable frequency air compressor, thereby achieving a wide-frequency-range, adjustable vibration reduction control effect.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The present invention uses a novel material, metal rubber, which has good environmental adaptability and is suitable for high temperature, irradiation and other scenarios, to replace traditional rubber or polyurethane materials and other cushioning materials. It is suitable for different working conditions, has strong durability, long service life and long service life.

[0028] (2) Use magnetohydrodynamic technology with high energy consumption, viscosity and adjustable damping characteristics to target and enhance vibration reduction in the peak frequency band of the vibration isolation device.

[0029] (3) The number of blades on the rotor can be increased or decreased according to the actual working conditions. Changes in the shape, tilt angle and length of the rotor blades will bring different damping characteristics, which can adapt to different compressor working conditions.

[0030] (4) Applying magnetorheological fluid technology to air compressor vibration isolation can make the vibration absorption frequency of the isolator change with the speed of the variable frequency air compressor. The vibration absorption frequency of the isolator can be steplessly controlled by changing the magnitude of the electromagnetic coil current.

[0031] (5) The spatially arranged springs can isolate vibration in all directions and have an isolation effect on vibration in each direction; the stiffness of the vibration isolation device can be changed by replacing springs with different stiffnesses to obtain different vibration isolation effects. Attached Figure Description

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0033] Appendix Figure 1 This is a schematic diagram of the overall air compressor system according to an embodiment of the present invention;

[0034] Appendix Figure 2 This is a cross-sectional schematic diagram of the vibration isolation device according to an embodiment of the present invention;

[0035] Appendix Figure 3 This is a top view of the upper structure of the vibration isolation device according to an embodiment of the present invention;

[0036] Appendix Figure 4A lower structure sectional view of a vibration isolation device in an embodiment of the present application;

[0037] Attached Figure 5 A zoomed-in view of a threaded pair of the lower part of the rotor;

[0038] Figure legend: 1 - air compressor, 2 - bolt A, 3 - nut A, 4 - bearing platform, 5 - vibration isolator body, 6 - bolt B, 7 - nut B, 8 - bottom cover, 9 - data line,

[0039] 501 - angular contact ball bearing A, 502 - bolt B, 503 - top cover, 504 - controller, 505 - rotor, 506 - rubber ring, 507 - electromagnetic coil, 508 - blade, 509 - angular contact ball bearing B, 510 - boss, 511 - spring, 512 - guide platform, 513 - metal-rubber piece, 514 - housing. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0041] It should be noted that the directionality indicated in the embodiments of the present application (such as up, down, left, right, etc.) is only used to explain the relative positional relationship and movement between components in a certain posture, and if the certain posture changes, the directionality changes accordingly.

[0042] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection. It can be direct connection, or indirect connection through an intermediate medium, or internal communication of two objects, or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0043] As shown in the figure, a three-way combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber, the vibration isolation device is connected with an air compressor, the vibration isolation device includes a blade for stirring magnetic fluid, when the vibration isolation device is vibrated, the energy is dissipated by stirring the magnetic fluid through the blade to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator; the vibration isolation device adjusts the damping effect by changing the angle of the blade for stirring the magnetic fluid, or changes the viscosity of the magnetic fluid according to the change of the speed of the air compressor, forming a wide frequency domain and adjustable damping control.

[0044] The vibration isolation device comprises a bearing platform 4 for connecting the air compressor 1; the blade 508 for stirring the magnetic fluid is arranged in the magnetic fluid pool below the bearing platform, the blade is arranged at the rotor 505 in the magnetic fluid pool, the rotor is connected with the threads of the shell 514 of the magnetic fluid pool through the threads with a preset length and forms a threaded pair, when the bearing platform pushes the rotor connected therewith to ascend and descend, the threaded pair rotates the rotor, and the blade stirs the magnetic fluid of the magnetic fluid pool.

[0045] The threads of the shell of the magnetic fluid pool are provided below with a boss 510, the lower part of the rotor is connected with the boss through the angular contact ball bearing B 509, and the upper part of the rotor is connected with the bearing platform through the angular contact ball bearing A 501;

[0046] The number of the blades on the rotor is matched with the working condition of the vibration isolation device, different damping characteristics are formed by adjusting the shape, inclination angle and length of the rotor blade to adapt to different compressor working conditions;

[0047] In this example, the threaded pair for rotating the rotor is a non-self-locking threaded pair.

[0048] When the vibration absorption frequency needs to be adjusted, the rotational speed and the moving distance of the rotor can be adjusted by adjusting the pitch and length of the threaded pair when the parameters of the specific structure of the vibration isolation device are designed, so as to obtain different damping effects.

[0049] The rotor is assembled at the inner ring of the angular contact ball bearing, and the bearing platform has an axial shoulder for positioning the angular contact ball bearing.

[0050] The magnetic fluid pool is surrounded by the top cover 503 below the bearing platform and the shell, and a preset amount of magnetic fluid is arranged in the magnetic fluid pool;

[0051] The shell is provided with a top cover, and the top cover is pressed with a rubber ring for positioning the electromagnetic coil.

[0052] The end face of the boss is assembled with a spring 511, and the spring is fixed on the bottom cover of the vibration isolation device and can be stretched and contracted;

[0053] The boss is internally provided with a groove connected with a guide platform 512, and the guide platform is connected with a metal rubber part 513 fixed in the circular groove of the bottom cover;

[0054] The spring is a omnidirectional vibration isolation structure arranged in space, the stiffness of the vibration isolation device is changed by replacing springs with different stiffnesses, so as to obtain different vibration isolation effects.

[0055] The bottom cover is connected with the shell of the vibration isolation device below the bearing platform; the shell of the vibration isolation device is internally provided with a controller and an electromagnetic coil; and the controller is connected with the electromagnetic coil through wires.

[0056] The magnetic fluid pool is arranged in the magnetic field range of the electromagnetic coil, and the shell is provided with a data line slot for connecting the controller with the air compressor speed controller through a data line 9.

[0057] The controller changes the magnetic field strength by changing the current size of the electromagnetic coil according to the air compressor speed, thereby affecting the viscosity of the magnetic fluid, so that the vibration absorption frequency of the vibration isolation device changes with the change of the variable frequency air compressor speed, and the vibration absorption frequency of the vibration isolation device is steplessly adjusted by adjusting the magnetic field strength of the electromagnetic coil.

[0058] The angular contact ball bearings include an angular contact ball bearing A 501 and an angular contact ball bearing B 509, and the rotor is provided with shaft shoulders for positioning the angular contact ball bearings A and B, respectively.

[0059] The rotor is provided with a triangular protrusion for limiting, and the shell is provided with a protrusion section and an inclined surface for cooperating with the triangular protrusion on the rotor to limit the rotor.

[0060] In this example, the air compressor is connected to the bearing platform by bolts A2 and nuts A3, and the vibration isolator body 5 of the vibration isolation device is fixed to the base by bolts B6 and nuts B7.

[0061] When the vibration isolation device works, the vibration is transmitted from the air compressor to the vibration isolation device. When the vibration isolation device is subjected to vibration, the vibration force is transmitted to the bearing platform, which drives the rotor to move longitudinally through the angular contact ball bearing A, and at the same time, the rotor rotates when moving longitudinally through the screw pair cooperation between the rotor and the shell. The rotor drives the blades to stir the magnetic fluid in the pool, and through the damping action of the magnetic fluid, the energy conversion and dissipation are realized to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator;

[0062] The vibration force is also transmitted to the boss through the angular contact ball bearing B, so that the boss moves longitudinally and presses the spring and the guide platform. The spring has an included angle with the horizontal plane to absorb vibrations in all directions. After the spring is compressed, the boss continues to move downward, driving the guide platform to press the metal rubber part below it. The metal rubber part generates heat through the friction between the metal wires in the metal rubber part in the vibration, and the heat is dissipated. The air compressor is a variable frequency air compressor. When the speed changes, the signal is transmitted to the controller through the data line. The controller changes the current size in the electromagnetic coil according to the signal, changes the magnetic field in the electromagnetic coil, and then changes the viscosity of the magnetic fluid in the magnetic fluid pool to affect the damping of the magnetic fluid stirred by the blades rotating on the rotor. The vibration isolation device automatically adjusts its vibration absorption frequency with the change of the variable frequency air compressor speed, so as to realize more accurate vibration isolation and control.

[0063] Embodiment 1:

[0064] Reference is made to the accompanying drawings Figures 1-5A three-dimensional combined vibration isolation device based on adjustable damping magnetorheological vibration absorber, comprising a bearing platform 4 connected with an air compressor 1 through a bolt A2 and a nut A3, an angular contact ball bearing 501A assembled inside the bearing platform 4, and a rotor 505 assembled in the inner ring of the angular contact ball bearing 501A. A blade 508 is connected to the rotor 505, the rotor 505 and the blade 508 are immersed in a magnetic fluid, the rotor 505 can move up and down and rotate in the liquid pool, and the rotor 505 is connected through a convex boss 510 of an angular contact ball bearing 509B. The inner groove of the convex boss 510 is connected with a guide table 512, and the guide table 512 is connected with a metal rubber 513. The end face of the convex boss 510 is provided with a spring 511, the spring 511 is fixed on a bottom cover 8 and can be stretched and contracted. The bottom cover 8 is connected with an outer shell 514. The outer shell 514 is provided with a controller 504 and an electromagnetic coil 507. The controller 504 is connected with the electromagnetic coil 507 through wires. The outer shell 514 is covered with a top cover 503, and the top cover 503 is pressed with a rubber ring 506. The outer shell 514 and the internal components constitute a vibration isolator main body 5.

[0065] In this embodiment, the bearing platform 4 has a through hole, and the bearing platform 4 has a shaft shoulder for positioning the angular contact ball bearing 501A.

[0066] In this embodiment, the top cover 503 and the outer shell 514 constitute a magnetic fluid pool, and a certain amount of magnetic fluid is contained in the pool.

[0067] In this embodiment, the top cover 503 has a convex boss part to extrude the rubber ring 506 so that the electromagnetic coil 507 is installed in place.

[0068] Further, the top cover 503 has a groove to facilitate the downward movement of the bearing platform 4.

[0069] In this embodiment, the rotor 505 has a length of thread.

[0070] In this embodiment, the rotor 505 has a triangular protrusion for limiting.

[0071] In this embodiment, the rotor 505 has shaft shoulders for positioning the upper and lower angular contact ball bearings, respectively.

[0072] In this embodiment, the outer shell 514 has a convex part, and the convex part has a thread matched with the thread segment of the rotor 505, so that the rotor 505 can move up and down along the thread and rotate.

[0073] In this embodiment, the outer shell 514 has a convex segment and an inclined surface, which cooperate with the triangular protrusion on the rotor 505 to limit the rotor 505.

[0074] In this embodiment, the lower part of the outer shell 514 is circumferentially provided with through holes.

[0075] In this embodiment, the shell 514 is grooved to facilitate the connection of the controller 504 to the external air compressor speed controller through data line 9.

[0076] In this embodiment, the bottom cover 8 has a circular groove to facilitate the fixation of the metal rubber 513.

[0077] In this embodiment, the spring 511 has four groups connected between the boss 510 and the bottom cover 8.

[0078] The working method of a three-way combined vibration isolation device based on an adjustable damping magnetic rheological vibration absorber is as follows: First, determine the stiffness and length of the spring 511, and insert the spring 511 into the groove of the bottom cover 8. Then, place the head of the bolt C6 into the through hole around the bottom cover 8. Next, place the metal rubber 513 into the groove of the bottom cover 8, and install the guide table 512 on it. Insert the angular contact ball bearing 509B into the groove of the boss 510, then assemble the boss 510 on the guide table 512, and fix the other end of the spring 511 in the boss 510. Next, assemble the shell 514 on the bottom cover 8, and tighten the nut C7 connecting the shell 514 and the bottom cover 8. Select an appropriate angle, insert the blade 508 into the rotor 505, and screw the rotor 505 into the lower angular contact ball bearing 509B inner ring while pushing it down, until the triangular limit passes through the protruding ring of the shell 514. Then, pour an appropriate amount of magnetic fluid into the liquid tank of the shell 514. Place the controller 504 and the electromagnetic coil 507 into the groove of the shell 514, connect the wires, and place them into the wire slot. Next, place the rubber ring 506 on the electromagnetic coil 507. Pass the top cover 503 through the rotor 505 and cover the shell 514, and tighten the bolt B502 connecting the shell 514 and the top cover 503. Next, insert the angular contact ball bearing 501A into the shaft shoulder on the rotor 505, and place the bolt A2 on the top cover 503. Pass the hole on the bearing 4 through the bolt A2, and match the shaft shoulder on the bearing 4 with the outer ring of the angular contact ball bearing 501A. Finally, place the air compressor 1 on the bearing 4, pass the bolt A2 through the foot hole of the air compressor 1, tighten the nut A3 connecting the air compressor and the bearing, and complete the assembly.

[0079] When working, the vibration is transmitted from the air compressor 1 to the vibration isolation device. When the vibration isolation device is subjected to vibration, the force is transmitted to the support platform 4, which drives the rotor 505 to move longitudinally through the angular contact ball bearing 501A. Since the rotor 505 and the housing 513 are connected through a screw pair, the rotor 505 will rotate while moving longitudinally. The rotor 505 drives the blade 508 to stir the magnetic fluid in the liquid pool. Due to the damping effect of the magnetic fluid, the energy conversion and dissipation are realized, and the vibration amplitude transmitted to the lower layer of the vibration isolator is inhibited; then the vibration is transmitted to the boss 510 through the angular contact ball bearing 509B, the boss 510 moves longitudinally, and the boss 510 presses the spring 511 and the guide table 512. The spring 511 has an angle with the horizontal plane and the vertical plane, which is convenient for absorbing vibration in all directions. After the spring 511 is compressed, the boss 510 continues to move downward, driving the guide table 512 to press the lower metal rubber 513. The metal rubber 513 generates heat through the friction between the metal wires in the metal rubber 513 to dissipate the vibration. When the rotating speed of the frequency conversion air compressor in the air compressor 1 changes, the signal is transmitted to the controller through the data line 9, the controller 504 changes the current size in the electromagnetic coil 507, the magnetic field in the coil 507 changes, and then the viscosity of the magnetic fluid in the liquid tank is changed, which affects the damping of the blade 508 rotating on the rotor 505. Through this adjustment, the vibration isolation device can automatically adjust its vibration absorption frequency with the change of the rotating speed of the frequency conversion air compressor, so as to realize more accurate vibration isolation and control.

[0080] Example 2:

[0081] In this example, a three-way combined vibration isolation device based on adjustable damping magnetic fluid vibration absorber includes a support platform connected to an air compressor 1 through bolts and nuts, an angular contact ball bearing is assembled inside the support platform, and a rotor is assembled in the inner ring of the angular contact ball bearing. The rotor is connected with a blade, the rotor and the blade are immersed in magnetic fluid, the rotor can move up and down and rotate in the liquid pool, and the lower part of the rotor is connected with a boss through an angular contact ball bearing B. The boss is connected with a guide table through a groove in the inner part of the boss, and the guide table is connected with metal rubber. The lower end face of the boss is assembled with a spring, the spring is fixed on a bottom cover and can be stretched and contracted. The bottom cover is connected with a housing. The housing is provided with a controller and an electromagnetic coil. The controller is connected with the electromagnetic coil through a wire. The housing is covered with a top cover, and the top cover is pressed with a rubber ring.

[0082] Further, the support platform has a through hole, and the inside of the support platform has a shoulder for positioning the angular contact ball bearing.

[0083] Further, the top cover and the housing form a magnetic fluid liquid pool, and a certain amount of magnetic fluid is contained in the liquid pool.

[0084] Further, the boss part of the top cover extrudes the rubber ring to install the electromagnetic coil in place.

[0085] Further, the top cover has a groove to facilitate the downward movement of the bearing platform.

[0086] Further, the rotor has a length of thread.

[0087] Further, the rotor has shaft shoulders for positioning the upper and lower angular contact ball bearings.

[0088] Further, the rotor has a triangular protrusion for limiting.

[0089] Further, the housing has a protruding part with a thread inside to cooperate with the thread segment of the rotor, so that the rotor can move up and down along the thread and rotate.

[0090] Further, the housing has a protruding segment and an inclined surface to cooperate with the triangular protrusion of the rotor to limit the rotor.

[0091] Further, the upper part of the housing has circumferentially distributed threaded holes.

[0092] Further, the housing has a groove to facilitate the connection of the controller to the air compressor speed controller through the data line.

[0093] Further, the spring has 4 groups connected between the boss and the bottom cover.

[0094] Further, the bottom cover has a circular groove inside to facilitate the fixation of the metal rubber.

Claims

1. A three-dimensional combined vibration isolation device based on adjustable damping magneto-rheological vibration absorber, characterized in that: The vibration isolation device is connected with the air compressor, and the vibration isolation device comprises a blade for stirring the magnetic fluid. When the vibration isolation device is subjected to vibration, energy is dissipated by stirring the magnetic fluid through the blade to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator. The vibration isolation device adjusts the damping effect by changing the angle of the blade for stirring the magnetic fluid, or changes the viscosity of the magnetic fluid according to the change of the rotating speed of the air compressor, thereby forming a wide frequency range and adjustable damping control. The vibration isolation device comprises a bearing platform (4) for connecting the air compressor (1). The blade (508) for stirring the magnetic fluid is arranged in a magnetic fluid pool below the bearing platform. The blade is arranged at a rotor (505) in the magnetic fluid pool. The rotor is connected with a thread structure of a preset length to a thread of a shell (514) of the magnetic fluid pool and forms a thread pair. When the bearing platform pushes the rotor connected therewith to ascend or descend, the thread pair rotates the rotor, so that the blade stirs the magnetic fluid of the magnetic fluid pool. A boss (510) is arranged below the thread of the shell of the magnetic fluid pool. The lower part of the rotor is connected with the boss through an angular contact ball bearing B (509). The upper part of the rotor is connected with the bearing platform through an angular contact ball bearing A (501). The number of the blades on the rotor is matched with the working condition of the vibration isolation device. Different damping characteristics are formed by adjusting the shape, inclination angle and length of the rotor blade to adapt to different compressor working conditions. The rotor is assembled at the inner ring of the angular contact ball bearing. The inner part of the bearing platform has a shoulder for positioning the angular contact ball bearing. The magnetic fluid pool is surrounded by the top cover (503) below the bearing platform and the shell. A preset amount of magnetic fluid is arranged in the magnetic fluid pool. The shell is covered with the top cover. A rubber ring for positioning the electromagnetic coil is arranged below the top cover. The end surface of the boss is assembled with a spring (511). The spring is fixed on the bottom cover of the vibration isolation device and can be stretched and contracted. The boss is internally provided with a groove connected with a guide platform. The guide platform is connected with a metal rubber part (513) fixed in the circular groove of the bottom cover. The spring is a spatially arranged omnidirectional vibration isolation structure. Different stiffness of the spring is replaced to change the stiffness of the vibration isolation device, so as to obtain different vibration isolation effects. 2.The three-dimensional combined vibration isolation device based on the adjustable damping magneto-rheological vibration absorber according to claim 1, characterized in that: The bottom cover is connected with the shell of the vibration isolation device below the bearing platform. The shell of the vibration isolation device is internally provided with a controller and an electromagnetic coil. The controller is connected with the electromagnetic coil through a wire.

3. The three-dimensional combined vibration isolation device based on the adjustable damping magneto-rheological vibration absorber according to claim 2, characterized in that: The magnetic fluid pool is arranged in the magnetic field range of the electromagnetic coil. A data line groove is arranged at the shell, so that the controller is connected with the rotating speed controller of the air compressor through a data line. The controller changes the magnetic field strength by changing the current size of the electromagnetic coil according to the rotating speed of the air compressor, so as to affect the viscosity of the magnetic fluid. The vibration absorption frequency of the vibration isolation device changes with the change of the rotating speed of the variable frequency air compressor. The vibration absorption frequency of the vibration isolation device is steplessly adjusted and controlled by adjusting the magnetic field strength of the electromagnetic coil.

4. The three-dimensional combined vibration isolation device based on the adjustable damping magneto-rheological vibration absorber according to claim 3, characterized in that: The angular contact ball bearing comprises an angular contact ball bearing A (501) and an angular contact ball bearing B (509). The rotor is provided with a shoulder for positioning the angular contact ball bearing A and the angular contact ball bearing B respectively. The rotor is provided with a triangular protrusion for limiting. The shell is provided with a protruding section and an inclined surface for cooperating with the triangular protrusion on the rotor to limit the rotor.

5. The working method of the three-dimensional combined vibration isolation device based on the adjustable damping magneto-rheological vibration absorber, using the three-dimensional combined vibration isolation device based on the adjustable damping magneto-rheological vibration absorber according to claim 4, characterized in that: When the vibration isolation device is working, the vibration is transmitted from the air compressor to the vibration isolation device. When the vibration isolation device is subjected to vibration, the vibration force is transmitted to the bearing platform. The bearing platform drives the rotor to move longitudinally through the angular contact ball bearing A. At the same time, the rotor is rotated when it moves longitudinally through the screw pair cooperation between the rotor and the shell. The rotor drives the blades to stir the magnetic fluid in the liquid pool. Through the damping effect of the magnetic fluid, the energy conversion and dissipation are realized to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator. The vibration force is also transmitted to the boss through the angular contact ball bearing B, so that the boss moves longitudinally. The boss presses the spring and the guide platform. The spring has an angle with the horizontal plane to absorb the vibration in all directions. After the spring is compressed, the boss continues to move downward, driving the guide platform to press the metal rubber part below. The metal rubber part generates heat through the friction between the metal wires in the metal rubber part to dissipate the vibration. The air compressor is a variable frequency air compressor. When the speed of the air compressor changes, the signal is transmitted to the controller through the data line. The controller changes the current in the electromagnetic coil according to the signal, changes the magnetic field in the electromagnetic coil, and then changes the viscosity of the magnetic fluid in the magnetic fluid pool to affect the damping of the magnetic fluid stirred by the blades when the rotor rotates. The vibration isolation device automatically adjusts the vibration absorption frequency with the change of the speed of the variable frequency air compressor, so as to realize more accurate vibration isolation and control.

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