Radial magnetic bearing and vacuum pump with same

Abstract

The utility model discloses a radial magnetic bearing and a vacuum pump with the same. The radial magnetic bearing comprises an iron core, a plurality of coils, a circuit board and a cable. The iron core comprises an annular iron yoke and a plurality of core columns, the core columns are arranged in an annular hole of the annular iron yoke around the center circumference of the annular iron yoke and extend in the radial direction of the annular iron yoke, and the end of each core column is connected with the inner wall face of the annular iron yoke. The coils are respectively arranged around the core columns; the circuit board is annular, the circuit board is arranged on the upper sides of the coils and electrically connected with the coils, and the upper end face of the circuit board is provided with a plugging port; and one end of the cable is plugged into the plugging port, and the other end is electrically connected with an external power supply. The magnetic bearing provided by the utility model can solve the problem of difficult wiring of the existing magnetic bearing, and has higher safety.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a radial magnetic bearing and a vacuum pump having the same. Background Art

[0002] Magnetic bearings are a new type of high-performance bearings. Compared with traditional ball bearings, sliding bearings and oil film bearings, magnetic bearings have no mechanical contact, and the rotor can reach a very high operating speed. They have the advantages of low mechanical wear, low energy consumption, low noise, long life, no need for lubrication, and no oil pollution.

[0003] The existing magnetic bearing system has components such as coils, controllers, electromagnets, and sensors. The coils, controllers, and various electrical components need to be connected through electrical wires. Multiple electrical wires form a complex circuit structure, and wiring is very difficult. During actual use, the wiring of each coil may be unstable. The safety of the magnetic bearing needs to be improved, and it is not convenient for subsequent inspection and maintenance. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a radial magnetic bearing and a vacuum pump having the same.

[0005] The solution of the utility model to solve its technical problems is:

[0006] In a first aspect, the present invention provides a radial magnetic bearing, comprising:

[0007] An iron core comprising an annular iron yoke and a plurality of core columns, wherein the plurality of core columns are disposed in an annular hole of the annular iron yoke around a central circumference of the annular iron yoke and extend radially along the annular iron yoke, with an end portion of each core column connected to an inner wall surface of the annular iron yoke;

[0008] A plurality of coils, each of which is disposed around the core column;

[0009] A circuit board in a ring shape is provided on the upper side of the coils and is electrically connected to each of the coils, and an insertion interface is provided on the upper end surface of the circuit board;

[0010] A power cable, one end of which is plugged into the socket, and the other end of which is electrically connected to an external power source.

[0011] The present invention has at least the following beneficial effects: by electrically connecting the circuit board to each coil and providing an interface on the circuit board for connecting with the cable, the problem of difficult wiring of existing magnetic bearings can be solved, which is beneficial to subsequent inspection and maintenance. Moreover, the radial magnetic bearings of the embodiments of the present invention are safer both during use and during wiring.

[0012] As a further improvement of the above technical solution, the radial magnetic bearing also includes multiple skeletons, each of which is hollow to form an installation cavity, the installation cavity is arranged along the radial extension of the annular iron yoke, and both ends of the installation cavity are open. The core column is arranged in a one-to-one correspondence with the skeleton and is passed through the installation cavity. The coil is wound around the outer circumference of the skeleton, and the circuit board is detachably connected to the skeleton.

[0013] As a further improvement of the above technical solution, a first limiting plate and a second limiting plate are respectively provided at both ends of each of the skeletons, the first limiting plate and the second limiting plate are respectively protruded from the outer peripheral wall surface of the skeleton, the first limiting plate is connected to the inner wall surface of the annular iron yoke, the first limiting plate, the second limiting plate and the outer peripheral wall surface of the skeleton jointly form a limiting groove, and the coil is arranged in the limiting groove.

[0014] As a further improvement of the above technical solution, the first limiting plate is provided with a fixing column, which extends up and down and is arranged on the upper end surface of the first limiting plate. The circuit board is provided with a plurality of first mounting holes, and the first mounting holes are arranged in a one-to-one correspondence with the fixing columns, and the fixing columns are passed through the corresponding first mounting holes.

[0015] As a further improvement of the above technical solution, the inner wall of the annular iron yoke is provided with a plurality of mounting surfaces, the mounting surfaces are perpendicular to the radial direction of the annular iron yoke, and the first limiting plate is connected to the mounting surfaces in a one-to-one correspondence.

[0016] As a further improvement of the above technical solution, the second limiting plate is provided with a wire outlet, the wire outlet is set to open upward, the circuit board is provided with a plurality of wire outlet holes, the wire outlet holes are arranged in one-to-one correspondence with the wire outlets on each second limiting plate, and the coil passes through the wire outlet and the wire outlet holes and is welded to the circuit board.

[0017] As a further improvement of the above technical solution, each inner wall surface of the installation cavity is provided with a convex ridge, and the convex ridges are respectively in contact with the outer wall surface of the core column.

[0018] As a further improvement of the above technical solution, two adjacent side wall surfaces of the skeleton are respectively connected by arc surface transition.

[0019] As a further improvement of the above technical solution, four groups of wire grooves are provided on the outer periphery of the skeleton, and the four groups of wire grooves are respectively provided on the four arc surfaces of the skeleton. Each group of wire grooves is provided with multiple wire grooves, and the wire grooves in the same group are arranged radially along the annular iron yoke.

[0020] Secondly, the present invention provides a vacuum pump comprising a radial magnetic bearing as described in any of the above technical solutions. Since the radial magnetic bearings offer simple and convenient wiring and high safety, they facilitate installation and safety of the vacuum pump, and also simplify subsequent maintenance of the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief description of the drawings required for describing the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of them. Those skilled in the art can also derive other design solutions and drawings based on these drawings without inventive effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the radial magnetic bearing according to an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the exploded structure of the radial magnetic bearing according to an embodiment of the present utility model;

[0024] Figure 3 It is a structural schematic diagram of the iron core of an embodiment of the utility model;

[0025] Figure 4 This is a schematic structural diagram of a circuit board according to an embodiment of the present utility model;

[0026] Figure 5 It is a structural schematic diagram of the skeleton of an embodiment of the present utility model.

[0027] Figure numerals: 100, iron core; 110, annular iron yoke; 111, mounting surface; 112, second mounting hole; 120, core column; 200, coil; 300, circuit board; 310, plug interface; 320, first mounting hole; 330, wire outlet; 400, cable; 500, skeleton; 510, mounting cavity; 520, ridge; 530, wire trough; 600, first limiting plate; 610, fixing column; 700, second limiting plate; 710, wire outlet. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, descriptions of directions, such as up, down, front, back, left, right, etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0030] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without inventive effort are all within the scope of protection of the present invention. The various technical features of the present invention may be combined interchangeably as long as they do not conflict with each other.

[0033] Reference Figure 1 and Figure 2 On the one hand, the embodiment of the present utility model proposes a radial magnetic bearing, which can solve the problems of difficult wiring and low safety of existing magnetic bearings, and is conducive to subsequent inspection and maintenance work.

[0034] In this embodiment, the radial magnetic bearing includes an iron core 100, a coil 200, a circuit board 300 and a cable 400. Figure 3 The iron core 100 includes an annular iron yoke 110 and a core column 120. The core column 120 has multiple core columns 120, which are arranged around the central circumference of the annular iron yoke 110. The core columns 120 extend radially along the annular iron yoke 110 and are located in the annular hole of the annular iron yoke 110. The ends of each core column 120 are respectively connected and fixed to the inner wall surface of the annular iron yoke 110. The core column 120 provides a winding space for the coil 200. When the coil 200 is energized, it can generate a large magnetic induction intensity. The annular iron yoke 110 can connect the core columns 120, acting as a magnetic circuit.

[0035] The coil 200 is arranged around the core 120, referring to Figure 4 The circuit board 300 is ring-shaped. The circuit board 300 is arranged on the upper side of each coil 200 and is electrically connected to each coil 200. A plug interface 310 is provided on the upper end surface of the circuit board 300. One end of the cable 400 is plugged into the plug interface 310, and the other end is used to be electrically connected to an external power supply.

[0036] In this embodiment, since the circuit board 300 is used instead of the electrical wires connecting the coils 200, the wiring complexity of the entire radial magnetic bearing can be simplified. During use, the unstable line wiring can be reduced, the safety performance of the radial magnetic bearing can be improved, and subsequent inspection and maintenance work can be facilitated.

[0037] In some embodiments, the radial magnetic bearing further comprises a skeleton 500, and a plurality of skeletons 500 are provided, and the number and position of the skeletons 500 correspond to each other. Figure 5 Each skeleton 500 is hollow to form an installation cavity 510, and the installation cavity 510 is extended radially along the annular iron yoke 110, and both ends of the installation cavity 510 along the radial direction of the annular iron yoke 110 are open. The core column 120 is passed through the installation cavity 510, and the coil 200 is wound around the outer circumference of the skeleton 500.

[0038] It is understandable that the frame 500 can provide support for the installation of the circuit board 300. In this embodiment, the circuit board 300 is detachably connected to the frame 500, which is convenient for subsequent disassembly, maintenance or replacement of the circuit board 300.

[0039] In some embodiments, each frame 500 is connected to a first limiting plate 600 and a second limiting plate 700. The first limiting plate 600 and the second limiting plate 700 are respectively disposed at both ends of the frame 500 along the radial direction of the annular iron yoke 110. Furthermore, the first limiting plate 600 is connected to the inner wall surface of the annular iron yoke 110, and the second limiting plate 700 is disposed toward the central axis of the annular iron yoke 110. The first limiting plate 600 and the second limiting plate 700 are respectively protruded from the outer peripheral wall surface of the frame 500 and together with the outer peripheral wall surface of the frame 500 form a limiting groove.

[0040] The coil 200 is wound in the limiting groove, and the two radial ends of the coil 200 along the annular iron yoke 110 are respectively blocked by the first limiting plate 600 and the second limiting plate 700, so as to maintain the position of the coil 200 and prevent the coil 200 from falling out of the frame 500, thereby ensuring the performance and safety of the radial magnetic bearing.

[0041] In some embodiments, the first limiting plate 600 is provided with a fixing column 610, which extends in the up and down directions, and the lower end of the fixing column 610 is connected to the upper end surface of the first limiting plate 600. The circuit board 300 is provided with a first mounting hole 320, and there are multiple first mounting holes 320. The multiple first mounting holes 320 are respectively provided in one-to-one correspondence with the fixing columns 610 on the first limiting plate 600. When installing the circuit board 300, the fixing column 610 is passed through the corresponding first mounting hole 320.

[0042] It is understandable that the fixing column 610 can lock the position of the circuit board 300 to prevent the circuit board 300 from moving relative to the core 100 and the skeleton 500, thereby ensuring the performance and safety of the radial magnetic bearing.

[0043] In this embodiment, since the skeleton 500 is arranged around the central circumference of the annular iron yoke 110 along with the core column 120, the fixing columns 610 of each skeleton 500 are also arranged around the central circumference of the annular iron yoke 110, the circuit board 300 is concentrically arranged with the annular iron yoke 110, and the first mounting hole 320 on the circuit board 300 is arranged around the central circumference of the circuit board 300.

[0044] In some embodiments, the inner wall of the annular iron yoke 110 is provided with multiple mounting surfaces 111, and the mounting surfaces 111 are perpendicular to the radial direction of the annular iron yoke 110. The mounting surfaces 111 can provide a connection space for the first limiting plate 600 to increase the contact area between the annular iron yoke 110 and the first limiting plate 600, thereby ensuring the connection strength between the first limiting plate 600, the skeleton 500 and the annular iron yoke 110.

[0045] In some embodiments, the second limiting plate 700 is provided with a wire outlet 710, which is opened upward, and the circuit board 300 is provided with multiple wire outlet holes 330. The number and position of the wire outlet holes 330 are set to correspond one-to-one with the number and position of the wire outlets 710 on each second limiting plate 700.

[0046] It can be understood that after the coil 200 is wound on the frame 500, the end of the coil 200 can pass through the wire outlet 710 and the wire outlet hole 330 and be welded to the circuit board 300, thereby realizing the electrical connection between the coil 200 and the circuit board 300. The provision of the wire outlet 710 makes it more convenient for the operator to perform the welding operation between the coil 200 and the circuit board 300.

[0047] It is understandable that each coil 200 has two ends. Correspondingly, each second limiting plate 700 is provided with two wire outlets 710 so that the two ends of the coil 200 extend out of the two wire outlets 710 respectively.

[0048] In some embodiments, each inner wall of the installation cavity 510 is respectively provided with a ridge 520. When the core column 120 is inserted into the installation cavity 510, the ridge 520 can abut against the outer wall of the core column 120, thereby fixing the relative position between the core column 120 and the skeleton 500.

[0049] In some embodiments, the skeleton 500 is provided with four side walls to form a quadrangular prism structure, and two adjacent side walls are respectively connected by arc transition surfaces to avoid the sharp angle position between the two adjacent side walls from causing wear to the coil 200 wound on the outside, thereby improving the service life of the coil 200 to a certain extent, thereby improving the service life of the entire radial magnetic bearing.

[0050] In some embodiments, the outer periphery of the frame 500 is provided with wire grooves 530. The wire grooves 530 are used to limit the winding position of the coil 200, ensuring a more uniform winding and preventing the coil 200 from slipping. In this embodiment, four groups of wire grooves 530 are provided, each group of wire grooves 530 being located at one of the four arc surfaces of the stock price. Each group of wire grooves 530 has multiple wire grooves 530. The wire grooves 530 in the same group are arranged radially along the annular iron yoke 110, that is, arranged on the outside of the arc surface along the length of the frame 500.

[0051] In this embodiment, the radial width of the wire slot 530 along the annular iron yoke 110 matches the width of the single-turn coil 200, which can define the winding position of each turn of the coil 200 to keep the coil 200 neat as a whole. In this embodiment, the coil 200 is an enameled wire.

[0052] In this embodiment, the first limiting plate 600, the second limiting plate 700 and the skeleton 500 are an integrally formed structure, and there is sufficient connection strength between the first limiting plate 600 and the skeleton 500 and between the second limiting plate 700 and the skeleton 500 to ensure the service life of the radial magnetic bearing.

[0053] It is understandable that the radial magnetic bearing of the embodiment of the present utility model can be applied to products such as vacuum pumps, blowers, superchargers, and compressors. In this embodiment, a second mounting hole 112 is provided on the annular iron yoke 110 of the radial magnetic bearing. The second mounting hole 112 is used to provide a mounting position for a connecting piece such as a screw, so as to install the radial magnetic bearing in products such as vacuum pumps, blowers, superchargers, and compressors, so that the radial magnetic bearing can be stably installed and used normally. In this embodiment, a plurality of second mounting holes 112 are provided, and the plurality of second mounting holes 112 are evenly arranged around the circumference of the central axis of the annular iron yoke 110 to increase the mounting position of the connecting piece, thereby improving the installation stability of the radial magnetic bearing.

[0054] In this embodiment, the circuit board 300 is specifically a PCB board, on which coordinate marks are provided, which facilitate the magnetic levitation controller to identify the position of the rotor during subsequent installation.

[0055] In another aspect, embodiments of the present invention further provide a vacuum pump comprising a radial magnetic bearing as provided in any embodiment of the first aspect. The radial magnetic bearing supports the rotating body of the vacuum pump, reduces friction with other components during rotation, and ensures rotational accuracy.

[0056] Since radial magnetic bearings have simple, convenient and highly safe wiring, they are conducive to improving the installation convenience and safety performance of vacuum pumps, and subsequent maintenance of vacuum pumps is also simpler.

[0057] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A radial magnetic bearing, characterized in that: include: An iron core comprising an annular iron yoke and a plurality of core columns, wherein the plurality of core columns are disposed in an annular hole of the annular iron yoke around a central circumference of the annular iron yoke and extend radially along the annular iron yoke, with an end portion of each core column connected to an inner wall surface of the annular iron yoke; A plurality of coils, each of which is disposed around the core column; A circuit board in a ring shape is provided on the upper side of the coils and is electrically connected to each of the coils, and an insertion interface is provided on the upper end surface of the circuit board; A power cable, one end of which is plugged into the socket, and the other end of which is electrically connected to an external power source.

2. The radial magnetic bearing according to claim 1, wherein: It also includes multiple skeletons, each of which is hollow to form an installation cavity, the installation cavity is set along the radial extension of the annular iron yoke, and the two ends of the installation cavity are opened. The core column is set in a one-to-one correspondence with the skeleton and is passed through the installation cavity. The coil is wound around the outer circumference of the skeleton, and the circuit board is detachably connected to the skeleton.

3. The radial magnetic bearing according to claim 2, wherein: A first limiting plate and a second limiting plate are respectively provided at both ends of each skeleton, and the first limiting plate and the second limiting plate are respectively protruded from the outer wall surface of the skeleton, and the first limiting plate is connected to the inner wall surface of the annular iron yoke, and the first limiting plate, the second limiting plate and the outer wall surface of the skeleton jointly form a limiting groove, and the coil is arranged in the limiting groove.

4. The radial magnetic bearing according to claim 3, characterized in that: The first limiting plate is provided with a fixing column, which extends up and down and is arranged on the upper end surface of the first limiting plate. The circuit board is provided with a plurality of first mounting holes, which are arranged in a one-to-one correspondence with the fixing column, and the fixing column is passed through the corresponding first mounting hole.

5. The radial magnetic bearing according to claim 3, characterized in that: The inner wall of the annular iron yoke is provided with a plurality of mounting surfaces, the mounting surfaces and the radial direction of the annular iron yoke are perpendicular to each other, and the first limiting plates are connected to the mounting surfaces in a one-to-one correspondence.

6. The radial magnetic bearing according to claim 3, characterized in that: The second limiting plate is provided with a wire outlet, which is opened upward, and the circuit board is provided with a plurality of wire outlet holes, which are arranged in a one-to-one correspondence with the wire outlets on each second limiting plate. The coil passes through the wire outlet and the wire outlet holes and is welded to the circuit board.

7. The radial magnetic bearing according to claim 2, wherein: Each inner wall surface of the installation cavity is provided with a convex ridge, and the convex ridges are respectively in contact with the outer wall surface of the core column.

8. The radial magnetic bearing according to claim 2, wherein: Two adjacent sidewall surfaces of the skeleton are connected by arc surface transition.

9. The radial magnetic bearing according to claim 8, characterized in that: Four groups of wire grooves are provided on the outer periphery of the frame, and the four groups of wire grooves are respectively provided at the four arc surfaces of the frame. Each group of wire grooves is provided with multiple wire grooves, and the wire grooves in the same group are arranged along the radial direction of the annular iron yoke.

10. A vacuum pump, characterized in that: Comprising the radial magnetic bearing according to any one of claims 1 to 9.

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