High-environment-adaptability high-power magnetic coupling transmission mechanism

Abstract

The invention relates to a high-environment-adaptability high-power magnetic coupling transmission mechanism which comprises a ceramic isolation sleeve without eddy current loss, an inner rotor and an outer rotor which are in non-contact transmission, permanent magnets packaged in a sectional manner by the inner rotor and the outer rotor, a squirrel cage and the like. According to the high-environment-adaptability high-power magnetic coupling transmission mechanism, the isolation sleeve is made of an insulating ceramic material, no eddy current loss exists in the operation process, the serious heating condition under high power is avoided, static sealing transmission of the inner rotor and the outer rotor is achieved, the provided mouse cage structure provides circumferential fixation for sectional type permanent magnet distribution, the utilization rate of the permanent magnets is increased, and the service life of the permanent magnets is prolonged. The magnetic coupling transmission mechanism solves the problem that the permanent magnets required by high power are difficult to install and fix, is beneficial to balancing axial force, has strong environmental adaptability due to the packaging structure form of the permanent magnets, and can work in severe environments such as high temperature, high pressure, strong corrosion and easy leakage.

Description

Technical Field

[0001] The invention relates to the field of magnetic pump transmission for high-power and harsh applications, and in particular to a high-power magnetic coupling transmission mechanism. Background Art

[0002] The magnetic coupling transmission mechanism is divided into an inner rotor and an outer rotor. The inner and outer rotors realize contactless transmission through magnetic field coupling. An isolation sleeve is added between the gap between the inner and outer rotors, and the inner rotor is isolated and sealed, which completely solves the leakage problem existing in the dynamic seal of some mechanical devices. Permanent magnet transmission technology has become the best choice for high temperature, high pressure, strong corrosion and easy leakage due to its excellent static sealing transmission capability. In high-power transmission, the sealing isolation sleeve in the magnetic coupling transmission mechanism is very important. Not only does it require high strength, but improper design will also cause serious eddy current loss and cause heating, which will cause magnet demagnetization in severe cases. Therefore, the isolation design needs to comprehensively consider eddy current loss, structural strength, gap size and other factors. Due to the limitation of the power density of permanent magnet transmission per unit volume, more permanent magnets need to be arranged to achieve high-power transmission. However, due to the limitations of material processing, magnetization and mechanical properties, it is difficult to increase the transmission power of permanent magnets. At this time, the layout and installation method of permanent magnets become a problem that must be overcome. Summary of the invention

[0003] In view of the above problems and technical requirements, a high-power magnetic coupling transmission mechanism with strong environmental adaptability is proposed.

[0004] The technical means adopted by the present invention are as follows:

[0005] The purpose of the present invention is to overcome the application limitations of magnetic coupling transmission mechanisms in harsh environments and high-power equipment, solve the problems of eddy current loss and reasonable installation and arrangement to improve the utilization rate of permanent magnets, and propose a high-power magnetic coupling transmission mechanism with strong environmental adaptability, which is suitable for harsh environments such as high temperature, high pressure, and strong corrosion. The proposed high-power magnetic coupling transmission mechanism includes a flange, a sealing ring, a sealing end cover, a ceramic isolation sleeve, an outer rotor and an inner rotor; the reserved installation interfaces of the inner and outer rotors can be connected to the load output shaft and the power input shaft respectively, the sealing end cover presses the ceramic isolation sleeve onto the end face of the flange by bolts, and installs a sealing ring between the flange and the ceramic isolation sleeve to achieve end face sealing, and the ceramic isolation sleeve is installed in the gap between the inner and outer rotors, so that a set of stable isolation devices is formed between the inner and outer rotors to separate the inner and outer rotors, and the magnetic coupling between the permanent magnets on the inner and outer rotors is used to transmit power. Taking advantage of the ceramic isolation sleeve's special advantages such as high strength, non-magnetic conductivity, high and low temperature resistance, and corrosion resistance, not only will eddy currents not be generated when the inner and outer rotors are driven to reduce the transmission efficiency, but it also has strong environmental adaptability.

[0006] The outer rotor includes a coupling shaft, an outer rotor housing, an axial limit clamp ring, an outer rotor permanent magnet, an outer rotor cage and an outer rotor outer end cover. The coupling shaft mainly provides an installation interface for the power input shaft, and is connected to the outer rotor housing by bolts to form the main transmission skeleton of the outer rotor. In order to improve the transmission power, the outer rotor is a cylindrical structure, and a longer permanent magnet can be arranged along the axial direction, but due to the limitations of the permanent magnet's own processing technology and magnetization, the permanent magnet is not easy to be too long. Based on this, the permanent magnet adopts a segmented design along the axial direction. In order to improve the transmission power of the permanent magnet, the permanent magnet adopts a fan-shaped design, which can further enhance the uniformity and strength of the magnetic field distribution. In order to ensure that multiple fan-shaped permanent magnets form a good magnetic circuit environment, and have good mechanical properties in structural installation, and can also have strong anti-corrosion ability to improve its environmental adaptability, the outer rotor adopts a cage design structure, and multiple fan-shaped slots are evenly distributed in the circumferential and axial directions for installing permanent magnets. The permanent magnets are alternately distributed in the circumferential magnetic poles, and different magnetic poles are close in the axial direction. In this way, the outer rotor cage is circumferentially fixed for the permanent magnet installation. An axial limit clamp ring and an outer rotor outer end cover are respectively installed at both ends of the outer rotor cage for axial limit, and the outer rotor outer end cover is pressed into the outer rotor housing by bolts, so that the permanent magnet is fully wrapped by the outer rotor housing, the axial limit clamp ring, the outer rotor cage and the outer rotor outer end cover, all of which are made of stainless steel, to achieve full sealing, improve the corrosion resistance of the permanent magnet, and at the same time, the outer rotor housing bears the centrifugal force of the permanent magnet.

[0007] The inner rotor includes an inner rotor back iron, an inner rotor cage, an inner rotor permanent magnet, an inner rotor end cover, an inner rotor permanent magnet shield, an inner rotor transmission shaft and a key. The inner rotor transmission shaft mainly provides an installation interface to connect with the load, and the inner rotor transmission shaft connects two or more inner rotor back irons through a key. An even number of wedge-shaped columns are evenly arranged in the circumference of the inner rotor cage, and are embedded and installed in the positioning groove of the inner rotor back iron. In this way, the inner rotor back iron and the inner rotor cage form a fan-shaped slot, in which the inner rotor permanent magnet can be installed. The inner rotor back iron and the inner rotor cage adopt a split design mainly considering the influence of the magnetic circuit. The inner rotor back iron is magnetic stainless steel, and the inner rotor cage is non-magnetic stainless steel, so as to form a good magnetic circuit environment. In order to improve the mechanical properties of the permanent magnet, the permanent magnet is pressed on the inner rotor back iron by a hexagon socket bolt. In order to improve the axial transmission capacity, the inner rotor cage is axially distributed with two or more slots for installing permanent magnets. The inner rotor end cover and the inner rotor permanent magnet shield are used to wrap the permanent magnet at the outer edge of the permanent magnet. In this way, the inner rotor back iron, the inner rotor cage, the inner rotor end cover and the inner rotor permanent magnet shield realize the all-round wrapping of the permanent magnet, which are all made of stainless steel, realize full sealing and improve the corrosion resistance of the permanent magnet.

[0008] The working principle of a high-power magnetic coupling transmission mechanism with strong environmental adaptability is that the ceramic isolation sleeve is installed between the inner and outer rotors to form a sealed isolation mechanism to seal and isolate the inner and outer rotors. The inner and outer rotors are evenly arranged with an even number of pairs of permanent magnets along the circumference, and the magnetic poles of the permanent magnets are alternating. At the same time, multiple permanent magnets are also arranged axially, which greatly improves the transmission power. When the permanent magnets of the outer rotor rotate, the magnetic field is relatively offset. At this time, the inner rotor is driven to rotate through the magnetic coupling of the permanent magnets of the inner and outer rotors to achieve power transmission.

[0009] The ceramic isolation sleeve adopts a cylindrical structure with a flange, and the material is zirconia ceramic, which is not only high in strength, but also resistant to high and low temperatures and corrosion. When the inner and outer rotor permanent magnets move, the dynamic magnetic field will not generate eddy currents due to its non-conductive properties, further reducing transmission losses. The flange-type cylindrical design can isolate the inner and outer rotors, and at the same time, the end face of the flange is used for end face static sealing, further improving its sealing isolation capability.

[0010] The outer rotor cage is made of non-magnetic stainless steel and processed into a block slot type. The permanent magnet installation slots are evenly distributed in the circumference. The permanent magnets are positioned circumferentially by wedge-shaped bosses between the slots. An axial limit block is set in the middle of the cage so that the permanent magnets can be positioned axially at one end. The wedge-shaped bosses of the outer rotor cage separate the permanent magnets to reduce the magnetic leakage between the permanent magnets. When the permanent magnets are assembled, due to the large interaction force between the magnets, the permanent magnets are divided into independent and spaced small blocks, which is convenient for the installation of the permanent magnets. When the diameter size of the coupling is limited by factors such as centrifugal force and dynamic balance, the multi-section cage structure can arrange the magnetic poles symmetrically, balance the axial force of the permanent magnets, and allow the increase of the length of the permanent magnets in the axial direction to meet the needs of high-power transmission.

[0011] The inner rotor cage is made of non-magnetic stainless steel and processed into a block slot type. The permanent magnet installation slots are evenly distributed in the circumferential direction. The permanent magnets are circumferentially positioned by wedge-shaped columns between the slots. An axial limit block is processed in the middle of the inner rotor cage to position the permanent magnet in the axial direction. The inner edge of the wedge-shaped column of the cage cooperates with the positioning groove of the inner rotor back iron, and the inner rotor cage is connected and positioned with the inner rotor back iron. The wedge-shaped column separates the permanent magnets to reduce the leakage magnetic flux between the permanent magnets. When the permanent magnets are assembled, due to the large interaction force between the magnets, the permanent magnets are divided into independent and spaced small blocks to facilitate the installation of the permanent magnets. When the diameter size of the coupling is limited by factors such as centrifugal force and dynamic balance, the multi-section cage structure can arrange the magnetic poles symmetrically, balance the axial force of the permanent magnets, and allow the increase of the length of the permanent magnets in the axial direction to meet the needs of high-power transmission.

[0012] The present invention has the following advantages:

[0013] The isolation sleeve is used to achieve completely contactless torque transmission between the active rotor and the driven rotor, and the dynamic seal of the active and driven shafts is changed into a static seal, which is suitable for strict zero leakage scenarios;

[0014] Using ceramic as the isolation sleeve material avoids the heating phenomenon caused by eddy current loss, allowing the equipment to run at high speed. The ceramic material has high strength and strong environmental adaptability.

[0015] The designed squirrel cage structure provides circumferential fixation for the permanent magnet, which not only improves the space utilization but also facilitates the fixed installation of the permanent magnet;

[0016] The designed axial two-stage or multi-stage permanent magnet installation method and symmetrical magnetic pole installation of permanent magnets achieves the balance of axial force;

[0017] The designed squirrel cage multi-stage installation method allows the installation and positioning of the permanent magnet after the axial length is increased, which is convenient for meeting the high-power transmission requirements of the permanent magnet coupling;

[0018] The proposed permanent magnet circumferential, radial and axial fixed installation structure and permanent magnet packaging protection structure realize the sealing protection and installation fixation of the permanent magnet, so that the magnetic transmission mechanism has strong environmental adaptability.

[0019] Based on the above reasons, the present invention has the potential to promote the application of magnetic transmission in the field of sealed transmission and break through the torque transmission limitation of magnetic coupling transmission mechanism in high-power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of a high-power magnetic coupling transmission mechanism with strong environmental adaptability provided by the present invention.

[0022] Figure 2 The present invention provides a schematic diagram of the outer rotor magnet installation structure of a high-power magnetic coupling transmission mechanism with strong environmental adaptability.

[0023] Figure 3 The present invention is a schematic diagram of the inner rotor magnet installation structure of a high-power magnetic coupling transmission mechanism with strong environmental adaptability.

[0024] Figure 4 The invention provides a schematic diagram of an outer rotor squirrel cage structure of a high-power magnetic coupling transmission mechanism with strong environmental adaptability.

[0025] Figure 5 The invention provides a schematic diagram of an inner rotor squirrel cage structure of a high-power magnetic coupling transmission mechanism with strong environmental adaptability.

[0026] Figure 6 The invention provides a schematic diagram of the inner rotor back iron structure of a high-power magnetic coupling transmission mechanism with strong environmental adaptability. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the implementation described below is only exemplary and not restrictive.

[0028] like Figure 1 As shown, a high-power magnetic coupling transmission mechanism with strong environmental adaptability includes: a flange 1, a sealing ring 2, a sealing end cover 3, a ceramic isolation sleeve 4, an outer rotor 5 and an inner rotor 6. The sealing end cover 3 uses a bolt to press the ceramic isolation sleeve 4 onto the end face of the flange 1 using the sealing ring 2 to achieve end face sealing. The outer rotor 5 and the inner rotor 6 are arranged on the outside and inside of the ceramic isolation sleeve 4 respectively. The outer rotor 5 is generally connected to the output shaft of the motor as power input to drive the outer rotor 5 to rotate. The inner rotor 6 is generally connected to the load. Under the action of magnetic coupling, the inner rotor 6 rotates synchronously with the outer rotor 5, and then drives the load to rotate together. In this way, power transmission is achieved through the non-contact magnetic coupling of the outer rotor 5 and the inner rotor 6. The flange 1 is a fixed part, which is generally connected to the equipment through a static seal. In this way, the electric power drives the load to rotate in a static sealing manner, and the torque transmission is achieved through non-contact magnetic force. The isolation seal is achieved through the ceramic isolation sleeve 4.

[0029] like Figure 1 , Figure 2 As shown, the outer rotor 5 includes: a connecting shaft 7, an outer rotor housing 8, an axial limit clamping ring 9, an outer rotor permanent magnet 10, an outer rotor cage 11, and an outer rotor outer end cover 12. The outer rotor cage 11 adopts a cage structure, with an even number of slots uniformly distributed along the circumferential direction and multiple slots distributed in the axial direction. Multiple outer rotor permanent magnets 10 are evenly distributed and installed in the slots of the outer rotor cage 11, and the two ends are respectively connected to the axial limit clamping ring 9 and the outer rotor outer end cover 12 by welding to achieve axial positioning of the outer rotor permanent magnet 10. The outer rotor outer end cover 12 is connected and pressed with the outer rotor shell 8 by bolts, wherein the axial limit clamping ring 9 needs to be processed to adjust the thickness so that the outer rotor outer end cover 12, the outer rotor cage 11 and the axial limit clamping ring 9 are pressed together in the outer rotor shell 8, so that the axial limit clamping ring 9, the outer rotor cage 11, the outer rotor outer end cover 12 and the outer rotor shell 8 can wrap the outer rotor permanent magnet 10 in all directions and realize axial, circumferential and radial positioning. The outer rotor shell 8 bears the centrifugal force generated when the outer rotor permanent magnet 10 rotates, so that the outer rotor permanent magnet 10 can be protected from rust and its force conditions are good and stable. The outer rotor housing 8 is connected to the connecting shaft 7 by bolts. The connecting shaft 7 provides a connecting port matching the motor output shaft, so that the outer rotor 5 can achieve rotational motion under the electric power output by the motor.

[0030] like Figure 1 , Figure 3As shown, the inner rotor 6 includes: an inner rotor back iron 13, an inner rotor cage 14, an inner rotor permanent magnet 15, an inner rotor end cover 16, an inner rotor permanent magnet shield 17, an inner rotor transmission shaft 18, and a key 19. Two or more inner rotor back irons 13 are connected to the inner rotor transmission shaft 18 through a key 19. The inner rotor cage 14 is embedded between different inner rotor back irons 13 through a positioning groove and is integrated with the inner rotor back iron 13. The inner rotor cage 14 adopts a cage structure, with an even number of slots evenly distributed along the circumferential direction and multiple slots distributed in the axial direction. Multiple inner rotor permanent magnets 15 are evenly installed in the slots of the inner rotor cage 14. At the same time, the inner rotor permanent magnets 15 are pressed onto the inner rotor back iron 13 by hexagon socket bolts to fix the inner rotor permanent magnets 15. An inner rotor permanent magnet shield 17 is sleeved on the outer surface of the inner rotor permanent magnet 15. The inner rotor end cover 16 is installed at both ends of the inner rotor transmission shaft 18, and is welded together with the inner rotor transmission shaft 18 and the inner rotor permanent magnet shield 17 to form an all-round wrapping of the inner rotor permanent magnet 15, thereby achieving rust prevention and protection for the inner rotor permanent magnet and enhancing its environmental adaptability.

[0031] like Figure 2 As shown, an even number of slots are evenly distributed in the circumferential direction of the outer rotor cage 11, the S and N magnetic poles of the outer rotor permanent magnet 10 are alternately embedded in the outer rotor cage 11, two or more slots are distributed in the axial direction of the outer rotor cage 11, and the magnetic poles of the outer rotor permanent magnet 10 in the axial direction are symmetrically installed in opposite directions, so that the axial force of the interaction part of the permanent magnets is balanced. The outer rotor cage 11 adopts a squirrel cage structure to divide the permanent magnet into multiple sections, which not only provides convenient positioning and installation, but also reduces the processing requirements of the permanent magnet, increases the axial length, and enhances its force transmission performance. At the same time, the fully sealed permanent magnet structure makes the magnetic coupling highly adaptable to the environment and can work in harsh environments.

[0032] like Figure 3 As shown, the inner rotor cage 14 is embedded and installed between different inner rotor back irons 13 through positioning grooves, so that the inner rotor cage 14 and the two inner rotor back irons 13 become one body, an even number of slots are evenly distributed in the circumferential direction of the inner rotor cage 14, and two or more sections of slots are distributed in the axial direction, and the S and N magnetic poles of the inner rotor permanent magnet 15 are alternately placed in the slots of the inner rotor cage 14, and are pressed on the inner rotor back iron 13 by bolts, so that the inner rotor permanent magnet 15 can withstand a higher centrifugal force; the magnetic poles of the inner rotor permanent magnet 15 in the axial direction are symmetrically and oppositely installed, so that the axial force of the interaction part of the permanent magnets is balanced, and the squirrel cage structure of the inner rotor cage 14 divides the permanent magnet into multiple sections, which not only provides convenient positioning and installation, but also reduces the processing requirements of the permanent magnet, increases the axial length, and enhances its force transmission performance. At the same time, the fully sealed permanent magnet structure makes the magnetic coupling highly adaptable to the environment and can work in harsh environments.

[0033] like Figure 4As shown, the outer rotor cage 11 adopts a cage structure, and an even number of sector slots 11.1 are processed along the circumferential direction and the axial direction respectively. In this way, the thickness of the magnet can be maximized in the radial direction and the torque transmission performance can be improved. At the same time, multiple magnets can be arranged in the axial direction to reduce the difficulty of magnet processing and improve the torque transmission performance. In order to ensure that multiple magnets can be installed and arranged in the axial direction, a spacing boss 11.2 is processed between the two axial magnets.

[0034] like Figure 5 As shown, the inner rotor cage 14 adopts a cage structure, and an even number of wedge-shaped columns 14.1 are evenly distributed along the circumference. Two wedge-shaped columns form a fan-shaped slot 14.2 for permanent magnet installation. The wedge-shaped columns 14.1 are used to realize circumferential positioning of the permanent magnets between the slots 14.2. An axial limit block 14.3 is arranged in the middle of the cage to realize axial positioning of the permanent magnets. The wedge-shaped columns 14.1 separate the permanent magnets, which reduces the leakage magnetic flux between the permanent magnets and the interaction force between the permanent magnets during installation. The axial segmentation balances the axial force between the permanent magnets installed with symmetrical poles. When the diameter size of the coupling is limited by factors such as centrifugal force and dynamic balance, the multi-segment cage structure allows the increase of the axial length of the permanent magnets to meet the requirements of high-power transmission.

[0035] like Figure 6 As shown, the inner rotor back iron 13 serves as an important structural support unit, which not only meets the magnetic circuit requirements, but also has a positioning groove 13.1 processed on its outer side. The wedge-shaped column 14.1 of the inner rotor cage 14 can be installed in the positioning groove 13.1 for connection and positioning. The middle of the two positioning grooves 13.1 is the permanent magnet installation position, and a threaded hole 13.2 is processed on it to press the permanent magnet. A keyway 13.3 is processed in the inner hole of the inner rotor back iron 13 to connect it with the transmission shaft 18 through the installation key 19.

[0036] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or modifications within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A high-power magnetic coupling transmission mechanism with strong environmental adaptability, characterized in that The invention comprises a flange (1), a sealing ring (2), a sealing end cover (3), a ceramic isolation sleeve (4), an outer rotor (5) and an inner rotor (6); the sealing end cover (3) presses the ceramic isolation sleeve (4) and the sealing ring (2) onto the end surface of the flange (1) by bolts to form an isolation sealing device; the ceramic isolation sleeve (4) is installed between the outer rotor (5) and the inner rotor (6); the outer rotor (5) transmits power to the inner rotor (6) by contactless magnetic coupling; the ceramic isolation sleeve (4) adopts a cylindrical design with a flange to improve its sealing isolation capability; the material is high-strength, non-magnetic, high and low temperature resistant and corrosion resistant zirconia ceramic to improve environmental adaptability; The outer rotor (5) comprises: a coupling shaft (7), an outer rotor housing (8), an axial limiting snap ring (9), an outer rotor permanent magnet (10), an outer rotor cage (11) and an outer rotor outer end cover (12); the outer rotor cage (11) adopts a squirrel cage design and is made of non-magnetic stainless steel, with an even number of fan-shaped slots evenly arranged in the circumferential direction, and is divided into multiple slots in the axial direction by a boss, so as to improve the axial transmission characteristics; the fan-shaped outer rotor permanent magnet (10) is installed in the slot to achieve circumferential fixation and alternating circumferential magnetic poles, and the two ends are limited by the axial limiting snap ring (9) and the outer rotor outer end cover (12); the outer rotor outer end cover (12) is pressed into the outer rotor housing (8) by bolts, so as to achieve all-round wrapping of the outer rotor permanent magnet (10) and improve environmental adaptability; the outer rotor housing (8) adopts magnetic stainless steel to bear the centrifugal load of the outer rotor permanent magnet (10), and is connected to the coupling shaft (7) by bolts to achieve power input; The inner rotor (6) comprises: an inner rotor back iron (13), an inner rotor cage (14), an inner rotor permanent magnet (15), an inner rotor end cover (16), an inner rotor permanent magnet shield (17), an inner rotor transmission shaft (18) and a key (19); the inner rotor back iron (13) is connected to the inner rotor transmission shaft (18) via the key (19); the inner rotor cage (14) is embedded and installed between the inner rotor back iron (13) via positioning grooves, and is integrated with the inner rotor back iron (13); the inner rotor cage (14) adopts a cage structure, and an even number of wedge-shaped columns are evenly distributed along the circumference to form a fan-shaped slot position, and the axial direction is The invention adopts a segmented arrangement, an axial limit stopper (14.3) is arranged in the middle of the cage, and the inner rotor permanent magnet (15) is pressed against the inner rotor back iron (13) by bolts in the fan-shaped slot. The circumferential magnetic poles of the inner rotor permanent magnet (15) are alternately distributed, and different axial magnetic poles are close to each other. The inner rotor back iron (13) and the inner rotor cage (14) are respectively made of magnetic conductive and non-magnetic conductive stainless steel to form a good magnetic circuit. The inner rotor end cover (16) and the inner rotor permanent magnet shield (17) are respectively installed at both ends and outside of the inner rotor cage (14) to form an all-round wrapping of the inner rotor permanent magnet (15) and improve environmental adaptability.

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