Three-way combined type vibration isolation device based on damping-adjustable magneto-rheological vibration absorbers

Abstract

The invention provides a three-way combined type vibration isolation device based on an adjustable damping magneto-rheological vibration absorber, the vibration isolation device is connected with an air compressor, the vibration isolation device comprises blades used for stirring magnetic fluid, and when the vibration isolation device is vibrated, the blades are used for stirring the magnetic fluid. The magnetic fluid is stirred by the blades to dissipate energy so as to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator; the vibration isolation device adjusts the vibration reduction effect by changing the angle of stirring the magnetic fluid blades, or changes the viscosity of the magnetic fluid according to the change of the rotating speed of the air compressor, and adjustable vibration reduction control in a wide frequency domain is formed. The variable-frequency air compressor has the fluid vibration absorption capacity and the metal rubber vibration absorption capacity at the same time, meanwhile, the viscosity of the magnetic fluid can be changed according to the change of the rotating speed of the variable-frequency air compressor, and then the wide-frequency-domain and adjustable vibration reduction control effect is achieved.

Description

Technical Field

[0001] The invention relates to the field of vibration isolation and noise reduction technology and air compressor technology, in particular to a three-way combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber. Background Art

[0002] In recent years, variable frequency screw compressors have brought new challenges to compressor noise reduction while improving partial load performance and compressor energy efficiency. On the one hand, variable frequency screw compressors have high operating speeds and high noise, which seriously worsens the compressor noise problem; on the other hand, variable frequency screw compressors have a wide operating speed range. At certain speeds, fluid-solid coupling resonance may occur, amplifying the noise of the compressor and reducing the reliability of the compressor. Researchers have conducted experimental studies on the effect of the operating speed of screw air compressors on their exhaust pressure pulsation characteristics. The results show that as the compressor speed increases, the exhaust airflow pulsation amplitude continues to rise, and the vibration noise is significantly enhanced. Therefore, how to control and solve the compressor noise problem has become a major technical problem in the research and application of variable frequency screw compressors.

[0003] Metal rubber, also known as metal microporous winding structure, is a metal elastic porous material, and the spiral metal wires that penetrate each other form its spatial network structure. Thanks to its excellent environmental adaptability and vibration reduction ability, metal rubber has been maturely applied in aerospace and defense weapons and equipment.

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

[0005] In this context, this patent proposes a three-way combined vibration isolation device based on an adjustable damping magnetorheological 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 vibrated, the energy can be dissipated by stirring the magnetic fluid, suppressing the vibration amplitude transmitted to the lower layer of the vibration isolator. In addition, the angle of the stirring magnetic fluid blades can be changed to obtain different vibration reduction effects. The biggest advantage of this device is that while it has the vibration absorption capabilities of fluid and metal rubber, it can also change the viscosity of the magnetic fluid according to the change in the speed of the variable frequency air compressor, thereby obtaining a wide frequency range, adjustable vibration reduction control effect. Summary of the invention

[0006] The present invention proposes a three-way combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber, which has both fluid vibration absorption and metal rubber vibration absorption capabilities, and can also 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, adjustable vibration reduction control effect.

[0007] The present invention adopts the following technical solutions.

[0008] A three-way combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber, wherein the vibration isolation device is connected to an air compressor and comprises blades for stirring a magnetic fluid. When the vibration isolation device is vibrated, the blades stir the magnetic fluid to dissipate energy so as to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator. The vibration isolation device adjusts the vibration reduction effect by changing the angle of the blades stirring the magnetic fluid, or changes the viscosity of the magnetic fluid according to the change of the air compressor speed, thereby forming a wide-band, adjustable vibration reduction control.

[0009] The vibration isolation device comprises a support platform (4) for connecting to an air compressor (1); the blades (508) for stirring the magnetic fluid are arranged in a magnetic fluid pool under the support platform, the blades are arranged at a rotor (505) in the magnetic fluid pool, the rotor is connected to the threads of a shell (514) of the magnetic fluid pool with a thread structure of a preset length to form a thread pair, and when the support platform pushes the rotor connected thereto to rise and fall, the thread pair causes the rotor to rotate, so that the blades stir the magnetic fluid in the magnetic fluid pool.

[0010] A boss (510) is provided below the thread of the magnetic fluid pool housing, the lower part of the rotor is connected to the boss via an angular contact ball bearing B (509), and the upper part of the rotor is connected to the support via an angular contact ball bearing A (501); When the vibration absorption frequency needs to be adjusted, the speed and movement distance of the rotor are adjusted by adjusting the pitch and length of the thread pair to obtain different damping effects.

[0011] The rotor is assembled on the inner ring of the angular contact ball bearing, and a shaft shoulder for positioning the angular contact ball bearing is arranged inside the support platform.

[0012] The magnetic fluid pool is formed by a top cover (503) below the support platform and an outer shell, and a preset amount of magnetic fluid is contained in the magnetic fluid pool; The shell is covered with a top cover, and a rubber ring for positioning the electromagnetic coil is pressed under the top cover.

[0013] The end surface of the boss is equipped with a spring (511), which is fixed on the bottom cover of the vibration isolation device and can be extended and retracted; A groove connected to the guide platform (512) is provided inside the boss, and the guide platform is connected to a metal rubber piece (513) fixed in the circular groove of the bottom cover; The spring is an omnidirectional vibration isolation structure arranged in space. The stiffness of the vibration isolation device is changed by replacing springs with different stiffnesses to obtain different vibration isolation effects.

[0014] The bottom cover is connected to the outer shell of the vibration isolation device below the support platform; the outer shell of the vibration isolation device is equipped with a controller and an electromagnetic coil; the controller is connected to the electromagnetic coil through an electric wire.

[0015] The magnetic fluid pool is arranged within the magnetic field range of the electromagnetic coil, and the housing is provided with a data line slot for connecting the controller to the air compressor speed controller via a data line (9); The controller changes the magnetic field strength by changing the current 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 speed of the variable frequency air compressor. The vibration absorption frequency of the vibration isolation device is steplessly regulated by adjusting the magnetic field strength of the electromagnetic coil.

[0016] The angular contact ball bearing comprises an angular contact ball bearing A (501) and an angular contact ball bearing B (509), and shaft shoulders for positioning the angular contact ball bearing A and the angular contact ball bearing B are provided at the rotor.

[0017] The rotor is provided with a triangular protrusion for limiting the position; the housing is provided with a protrusion section and an inclined surface for cooperating with the triangular protrusion on the rotor to limit the position of the rotor.

[0018] 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 vibrated, the vibration force is transmitted to the support. The support drives the rotor to move longitudinally through the angular contact ball bearing A. At the same time, through the cooperation of the spiral pair between the rotor and the housing, the rotor rotates while moving longitudinally. 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, thereby suppressing 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, causing the boss to move longitudinally, and the boss presses down the spring and the guide platform; the spring has an angle with the horizontal and vertical planes to absorb vibrations in all directions; after the spring is compressed, the boss continues to move downward, driving the guide platform to press down the metal rubber part below it, and the metal rubber part dissipates the heat generated by the friction between the metal wires of the metal rubber part during vibration. The air compressor is a variable frequency air compressor. When its speed 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, so that the magnetic field in the electromagnetic coil changes, and then changes the viscosity of the magnetic fluid in the magnetic fluid pool, so as to affect the damping of the stirring magnetic fluid when the blades at the rotor rotate, so that the vibration isolation device automatically adjusts its own vibration absorption frequency as the speed of the variable frequency air compressor changes, thereby achieving more accurate vibration isolation and control.

[0019] The present invention proposes a three-way combined vibration isolation device based on an adjustable damping magnetorheological 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 vibrated, the energy can be dissipated by stirring the magnetic fluid, thereby suppressing the vibration amplitude transmitted to the lower layer of the vibration isolator. In addition, the angle of the stirring magnetic fluid blades can be changed to obtain different vibration reduction effects. The greatest advantage of this device is that while it has the vibration absorption capabilities of both fluid and metal rubber, it can also change the viscosity of the magnetic fluid according to the change in the speed of the variable frequency air compressor, thereby obtaining a wide frequency domain, adjustable vibration reduction control effect.

[0020] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention adopts a new material metal rubber with good environmental adaptability and applicable to high temperature, radiation and other scenes to replace traditional rubber or polyurethane materials and other buffer materials. It is suitable for different working conditions, has strong durability, long service life and long service life.

[0021] (2) Utilize magnetic fluid technology with high energy consumption, viscosity, and adjustable damping characteristics to specifically enhance shock absorption in the peak frequency band where vibration of the vibration isolation device is severe.

[0022] (3) The number of blades on the rotor can be increased or decreased according to the actual working conditions. Changes in the shape, inclination angle, and length of the rotor blades will bring different damping characteristics and can adapt to different compressor working conditions.

[0023] (4) The magnetorheological fluid technology is used in the vibration isolation of air compressors. The vibration absorption frequency of the vibration isolator can change with the speed of the variable frequency air compressor. The vibration absorption frequency of the vibration isolator can be steplessly adjusted by changing the current of the electromagnetic coil.

[0024] (5) The springs arranged in space can provide omnidirectional vibration isolation and have an isolation effect on vibrations 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Attached Figure 1 This is a schematic diagram of the overall system of an air compressor according to an embodiment of the present invention; Attached Figure 2 It is a cross-sectional schematic diagram of a vibration isolation device according to an embodiment of the present invention; Attached Figure 3 It is a schematic top view of the upper structure of the vibration isolation device according to an embodiment of the present invention; Attached Figure 4 It is a cross-sectional schematic diagram of the lower structure of the vibration isolation device according to an embodiment of the present invention; Attached Figure 5 It is an enlarged schematic diagram of the thread pair at the lower part of the rotor; Explanation of the numbers in the figure: 1-air compressor, 2-bolt A, 3-nut A, 4-support, 5-isolator body, 6-bolt B, 7-nut B, 8-bottom cover, 9-data cable, 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 part, 514-housing. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0027] It should be noted that the directional indications (such as up, down, left, right, etc.) referred to in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will change accordingly.

[0028] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation" and the like should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two objects or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] As shown in the figure, a three-way combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber is shown. The vibration isolation device is connected to an air compressor and includes blades for stirring a magnetic fluid. When the vibration isolation device is vibrated, the blades stir the magnetic fluid to dissipate energy so as to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator. The vibration isolation device adjusts the vibration reduction effect by changing the angle of the blades stirring the magnetic fluid, or changes the viscosity of the magnetic fluid according to the change of the air compressor speed, thereby forming a wide-band, adjustable vibration reduction control.

[0030] The vibration isolation device includes a base 4 for connecting to the air compressor 1; the blades 508 for stirring the magnetic fluid are arranged in the magnetic fluid liquid pool under the base, and the blades are arranged at the rotor 505 in the magnetic fluid liquid pool. The rotor is connected to the thread of the outer shell 514 of the magnetic fluid liquid pool with a thread structure of a preset length to form a thread pair. When the base pushes the rotor connected to it to rise and fall, the thread pair causes the rotor to rotate, so that the blades stir the magnetic fluid in the magnetic fluid liquid pool.

[0031] A boss 510 is provided below the thread of the magnetic fluid pool housing, the lower part of the rotor is connected to the boss through an angular contact ball bearing B509, and the upper part of the rotor is connected to the support through an angular contact ball bearing A501; The number of blades on the rotor matches the working condition of the vibration isolation device, and different damping characteristics are formed by adjusting the shape, tilt angle and length of the rotor blades to adapt to different compressor working conditions; In this example, the thread pair that causes the rotor to rotate is a non-self-locking thread pair.

[0032] When the vibration absorption frequency needs to be adjusted, the rotation speed and movement distance of the rotor can be adjusted by adjusting the pitch and length of the thread pair when designing the parameters of the specific structure of the vibration isolation device to obtain different damping effects.

[0033] The rotor is assembled on the inner ring of the angular contact ball bearing, and a shaft shoulder for positioning the angular contact ball bearing is arranged inside the support platform.

[0034] The magnetic fluid pool is surrounded by a top cover 503 and a shell below the support platform, and a preset amount of magnetic fluid is contained in the magnetic fluid pool; The shell is covered with a top cover, and a rubber ring for positioning the electromagnetic coil is pressed under the top cover.

[0035] The end surface of the boss is equipped with a spring 511, which is fixed on the bottom cover of the vibration isolation device and can be extended and retracted; The boss is provided with a groove connected to the guide platform 512, and the guide platform is connected to the metal rubber piece 513 fixed in the circular groove of the bottom cover; The spring is an omnidirectional vibration isolation structure arranged in space. The stiffness of the vibration isolation device is changed by replacing springs with different stiffnesses to obtain different vibration isolation effects.

[0036] The bottom cover is connected to the outer shell of the vibration isolation device below the support platform; the outer shell of the vibration isolation device is equipped with a controller and an electromagnetic coil; the controller is connected to the electromagnetic coil through an electric wire.

[0037] The magnetic fluid pool is arranged within the magnetic field range of the electromagnetic coil, and a data line slot is arranged at the housing for connecting the controller to the air compressor speed controller via a data line 9; The controller changes the magnetic field strength by changing the current 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 speed of the variable frequency air compressor. The vibration absorption frequency of the vibration isolation device is steplessly regulated by adjusting the magnetic field strength of the electromagnetic coil.

[0038] The angular contact ball bearings include angular contact ball bearing A501 and angular contact ball bearing B509. The rotor is provided with shaft shoulders for positioning the angular contact ball bearing A and the angular contact ball bearing B respectively.

[0039] The rotor is provided with a triangular protrusion for limiting the position; the housing is provided with a protrusion section and an inclined surface for cooperating with the triangular protrusion on the rotor to limit the position of the rotor.

[0040] In this example, the air compressor is connected to the base with bolts A2 and nuts A3, and the vibration isolator body 5 of the vibration isolation device is fixed to the base with bolts B6 and nuts B7.

[0041] 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 vibrated, the vibration force is transmitted to the support. The support drives the rotor to move longitudinally through the angular contact ball bearing A. At the same time, through the cooperation of the spiral pair between the rotor and the housing, the rotor rotates while moving longitudinally. 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, thereby suppressing 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, causing the boss to move longitudinally, and the boss presses down the spring and the guide platform; the spring has an angle with the horizontal and vertical planes to absorb vibrations in all directions; after the spring is compressed, the boss continues to move downward, driving the guide platform to press down the metal rubber part below it, and the metal rubber part dissipates the heat generated by the friction between the metal wires of the metal rubber part during vibration. The air compressor is a variable frequency air compressor. When its speed 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, so that the magnetic field in the electromagnetic coil changes, and then changes the viscosity of the magnetic fluid in the magnetic fluid pool, so as to affect the damping of the stirring magnetic fluid when the blades at the rotor rotate, so that the vibration isolation device automatically adjusts its own vibration absorption frequency as the speed of the variable frequency air compressor changes, thereby achieving more accurate vibration isolation and control.

[0042] Embodiment 1: Reference Figure 1-5A three-way combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber includes a support 4 connected to an air compressor 1 through bolts A2 and nuts A3, wherein an angular contact ball bearing 501A is installed inside the support 4, and a rotor 505 is installed on the inner ring of the angular contact ball bearing 501A. A blade 508 is connected to the rotor 505, and 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 an angular contact ball bearing 509B boss 510. The boss 510 is grooved inside and connected to a guide platform 512, and the guide platform 512 is connected to a metal rubber 513. A spring 511 is installed on the end surface of the boss 510, and the spring 511 is fixed on a bottom cover 8 and can be retracted. The bottom cover 8 is connected to a housing 514. A controller 504 and an electromagnetic coil 507 are installed in the housing 514. The controller 504 is connected to the electromagnetic coil 507 through an electric wire. The outer shell 514 is covered with a top cover 503, and a rubber ring 506 is pressed under the top cover 503. The outer shell 514 and the internal components form the vibration isolator body 5.

[0043] In this embodiment, a through hole is provided on the support platform 4, and a shoulder is provided inside the support platform 4 for positioning the angular contact ball bearing 501A.

[0044] In this embodiment, the top cover 503 and the outer shell 514 form a magnetic fluid pool, and a certain amount of magnetic fluid is contained in the liquid pool.

[0045] In this embodiment, the top cover 503 has a boss portion that squeezes the rubber ring 506 to install the electromagnetic coil 507 in place.

[0046] Furthermore, a groove is provided on the top cover 503 to facilitate the downward movement of the support platform 4.

[0047] In this embodiment, the rotor 505 has a length of threads.

[0048] In this embodiment, the rotor 505 has a triangular protrusion for limiting position.

[0049] In this embodiment, the rotor 505 has shoulders for positioning the upper and lower angular contact ball bearings respectively.

[0050] In this embodiment, the housing 514 has a boss portion, and a thread is provided in the boss portion to cooperate with the threaded section of the rotor 505, so that the rotor 505 can move up and down and rotate along the thread.

[0051] In this embodiment, the housing 514 has a raised section and an inclined surface, which cooperate with the triangular protrusion on the rotor 505 to limit the rotor 505 .

[0052] In this embodiment, through holes are distributed circumferentially on the lower portion of the housing 514 .

[0053] In this embodiment, a groove is dug on the housing 514 to facilitate the controller 504 to be connected to an external air compressor speed controller via the data line 9 .

[0054] In this embodiment, a circular groove is provided in the bottom cover 8 to facilitate the fixing of the metal rubber 513 .

[0055] In this embodiment, there are four groups of springs 511 connected between the boss 510 and the bottom cover 8 .

[0056] As described above, a working method of a three-way combined vibration isolation device based on an adjustable damping magnetorheological 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 downward in the through holes around the bottom cover 8. Next, put the metal rubber 513 into the groove of the bottom cover 8, and install the guide platform 512 thereon. Insert the angular contact ball bearing 509B into the groove of the boss 510, then assemble the boss 510 on the guide platform 512, and fix the other end of the spring 511 in the boss 510. Next, assemble the housing 514 on the bottom cover 8, and tighten the nut C7 connecting the housing 514 and the bottom cover 8. Select a suitable angle, insert the blade 508 into the rotor 505, and buckle the rotor 505 into the inner ring of the lower angular contact ball bearing 509B, and screw the rotor 505 into the thread while pushing it downward until the triangular limit passes through the raised ring of the housing 514. Then, pour an appropriate amount of magnetic fluid into the liquid tank of the housing 514. Place the controller 504 and the electromagnetic coil 507 into the groove of the housing 514, connect the wires, and place the wires in the wire groove. Next, place the rubber ring 506 on the electromagnetic coil 507. Pass the top cover 503 through the rotor 505 and cover the housing 514, and tighten the bolt B502 connecting the housing 514 and the top cover 503. Next, snap the angular contact ball bearing 501A into the shoulder on the rotor 505, and place the bolt A2 on the top cover 503. Pass the bolt A2 through the hole on the support 4, and match the shoulder on the support 4 with the outer ring of the angular contact ball bearing 501A. Finally, place the air compressor 1 on the support 4, and pass the bolt A2 through the anchor hole of the air compressor 1, tighten the nut A3 connecting the air compressor and the support, and complete the assembly.

[0057] During operation, vibration is transmitted from the air compressor 1 to the vibration isolation device. When the vibration isolation device is vibrated, the force is transmitted to the support 4. The support 4 drives the rotor 505 to move longitudinally through the angular contact ball bearing 501A. Since the rotor 505 and the housing 513 are matched through the spiral pair, the rotor 505 will move longitudinally while rotating. The rotor 505 drives the blades 508 to stir the magnetic fluid in the liquid pool. Due to the damping effect of the magnetic fluid, the energy is converted and dissipated, thereby suppressing the vibration amplitude transmitted to the lower layer of the vibration isolator; then the vibration is transmitted to the boss 510 through the angular contact ball bearing 509B, and the boss 510 is longitudinally displaced. The boss 510 presses down the spring 511 and the guide platform 512. The spring 511 has an angle with the horizontal and vertical planes, which is convenient for absorbing vibrations in all directions. After the spring 511 is compressed, the boss 510 continues to move downward, driving the guide platform 512 to press down the lower metal rubber 513. The metal rubber part 513 dissipates the heat generated by the friction between the metal wires of the metal rubber part during vibration. When the speed of the variable frequency 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 in the electromagnetic coil 507, and the magnetic field in the coil 507 changes, thereby changing the viscosity of the magnetic fluid in the liquid tank, affecting the damping of the rotation of the blade 508 on the rotor 505. Through this adjustment, the vibration isolation device can automatically adjust its own vibration absorption frequency as the speed of the variable frequency air compressor changes, thereby achieving more accurate vibration isolation and control.

[0058] Embodiment 2: In this example, a three-way combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber includes a base connected to an air compressor 1 by bolts and nuts, an angular contact ball bearing is installed inside the base, and a rotor is installed on the inner ring of the angular contact ball bearing. Blades are connected to the rotor, and the rotor and blades are immersed in a magnetic fluid. The rotor can move up and down and rotate in the liquid pool, and the lower part of the rotor is connected to the boss through an angular contact ball bearing B. The boss is grooved inside and connected to the guide platform, and the guide platform is connected to the metal rubber. A spring is installed on the lower end face of the boss, and the spring is fixed on the bottom cover and can be retracted. The bottom cover is connected to the outer shell. A controller and an electromagnetic coil are installed in the outer shell. The controller is connected to the electromagnetic coil through wires. The outer shell is covered with a top cover, and a rubber ring is pressed under the top cover.

[0059] Furthermore, a through hole is provided on the support, and a shaft shoulder for positioning the angular contact ball bearing is provided inside the support.

[0060] Furthermore, the top cover and the outer shell form a magnetic fluid pool, and a certain amount of magnetic fluid is contained in the liquid pool.

[0061] Furthermore, a boss portion is provided on the top cover to squeeze the rubber ring so that the electromagnetic coil can be installed in place.

[0062] Furthermore, a groove is provided on the top cover to facilitate the downward movement of the support platform.

[0063] Furthermore, the rotor has a length of threads.

[0064] Furthermore, the rotor is provided with shaft shoulders for positioning the upper and lower angular contact ball bearings respectively.

[0065] Furthermore, a triangular protrusion for limiting position is provided on the rotor.

[0066] Furthermore, the housing has a raised portion, and a thread is provided in the raised portion to cooperate with the threaded section of the rotor, so that the rotor can move up and down and rotate along the thread.

[0067] Furthermore, the outer shell is provided with a raised section and an inclined surface, which cooperate with the triangular raised section on the rotor to limit the rotor.

[0068] Furthermore, threaded holes are distributed circumferentially on the upper portion of the shell.

[0069] Furthermore, the housing is grooved to facilitate connection of the controller to the air compressor speed controller via a data line.

[0070] Furthermore, there are four groups of springs connected between the boss and the bottom cover.

[0071] Furthermore, a circular groove is provided in the bottom cover to facilitate the fixing of the metal rubber.

Claims

1. A three-way combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber, characterized in that: The vibration isolation device is connected to the air compressor and includes blades for stirring the magnetic fluid. When the vibration isolation device is vibrated, the blades stir the magnetic fluid to dissipate energy so as to suppress the vibration amplitude transmitted to the lower layer of the vibration isolator. The vibration isolation device adjusts the vibration reduction effect by changing the angle of the blades stirring the magnetic fluid, or changes the viscosity of the magnetic fluid according to the change of the air compressor speed, thereby forming a wide-band, adjustable vibration reduction control.

2. According to claim 1, a three-way combined vibration isolation device based on an adjustable damping magnetorheological vibration absorber is characterized in that: The vibration isolation device comprises a support platform (4) for connecting to an air compressor (1); the blades (508) for stirring the magnetic fluid are arranged in a magnetic fluid pool under the support platform, the blades are arranged at a rotor (505) in the magnetic fluid pool, the rotor is connected to the threads of a shell (514) of the magnetic fluid pool with a thread structure of a preset length to form a thread pair, and when the support platform pushes the rotor connected thereto to rise and fall, the thread pair causes the rotor to rotate, so that the blades stir the magnetic fluid in the magnetic fluid pool.

3. The three-way combined vibration isolation device based on the adjustable damping magnetorheological vibration absorber according to claim 2 is characterized in that: A boss (510) is provided below the thread of the magnetic fluid pool housing, the lower part of the rotor is connected to the boss via an angular contact ball bearing B (509), and the upper part of the rotor is connected to the support via an angular contact ball bearing A (501); The number of blades on the rotor matches the working condition of the vibration isolation device, and different damping characteristics are formed by adjusting the shape, inclination angle and length of the rotor blades to adapt to different compressor working conditions.

4. The three-way combined vibration isolation device based on the adjustable damping magnetorheological vibration absorber according to claim 3 is characterized in that: The rotor is assembled on the inner ring of the angular contact ball bearing, and a shaft shoulder for positioning the angular contact ball bearing is arranged inside the support platform.

5. The three-way combined vibration isolation device based on the adjustable damping magnetorheological vibration absorber according to claim 3 is characterized in that: The magnetic fluid pool is formed by a top cover (503) below the support platform and an outer shell, and a preset amount of magnetic fluid is contained in the magnetic fluid pool; The shell is covered with a top cover, and a rubber ring for positioning the electromagnetic coil is pressed under the top cover.

6. The three-way combined vibration isolation device based on the adjustable damping magnetorheological vibration absorber according to claim 5 is characterized in that: The end surface of the boss is equipped with a spring (511), which is fixed on the bottom cover of the vibration isolation device and can be extended and retracted; A groove connected to the guide platform is provided inside the boss, and the guide platform is connected to a metal rubber piece (513) fixed in the circular groove of the bottom cover; The spring is an omnidirectional vibration isolation structure arranged in space. The stiffness of the vibration isolation device is changed by replacing springs with different stiffnesses to obtain different vibration isolation effects.

7. The three-way combined vibration isolation device based on the adjustable damping magnetorheological vibration absorber according to claim 6 is characterized in that: The bottom cover is connected to the outer shell of the vibration isolation device below the support platform; the outer shell of the vibration isolation device is equipped with a controller and an electromagnetic coil; the controller is connected to the electromagnetic coil through an electric wire.

8. The three-way combined vibration isolation device based on the adjustable damping magnetorheological vibration absorber according to claim 7 is characterized in that: The magnetic fluid pool is arranged within the magnetic field range of the electromagnetic coil, and a data line slot is arranged at the housing for connecting the controller to the air compressor speed controller via a data line; The controller changes the magnetic field strength by changing the current 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 speed of the variable frequency air compressor. The vibration absorption frequency of the vibration isolation device is steplessly regulated by adjusting the magnetic field strength of the electromagnetic coil.

9. The three-way combined vibration isolation device based on the adjustable damping magnetorheological vibration absorber according to claim 8 is characterized in that: The angular contact ball bearing comprises an angular contact ball bearing A (501) and an angular contact ball bearing B (509), and a shaft shoulder for positioning the angular contact ball bearing A and the angular contact ball bearing B respectively is provided at the rotor; The rotor is provided with a triangular protrusion for limiting the position; the housing is provided with a protrusion section and an inclined surface for cooperating with the triangular protrusion on the rotor to limit the position of the rotor.

10. The working method of the three-way combined vibration isolation device based on the adjustable damping magnetorheological vibration absorber is characterized by: 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 vibrated, the vibration force is transmitted to the support. The support drives the rotor to move longitudinally through the angular contact ball bearing A. At the same time, through the cooperation of the spiral pair between the rotor and the housing, the rotor rotates while moving longitudinally. 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, thereby suppressing 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, causing the boss to move longitudinally, and the boss presses down the spring and the guide table; the spring has an angle with the horizontal plane and the vertical plane to absorb vibration in all directions; after the spring is compressed, the boss continues to move downward, driving the guide table to press down the metal rubber part below it, and the metal rubber part dissipates the heat generated by the friction between the metal wires of the metal rubber part during vibration; The air compressor is a variable frequency air compressor. When its speed changes, a signal is transmitted to a controller through a data line. The controller changes the current in the electromagnetic coil according to the signal, so that the magnetic field in the electromagnetic coil changes, and then changes the viscosity of the magnetic fluid in the magnetic fluid pool, so as to affect the damping of the magnetic fluid stirred when the blades at the rotor rotate, so that the vibration isolation device automatically adjusts its own vibration absorption frequency as the speed of the variable frequency air compressor changes, thereby achieving more precise vibration isolation and control.

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