A magnetic levitation motor for refrigerant transportation

Abstract

The present invention discloses a magnetic levitation motor for refrigerant transportation, comprising a housing and a rotating shaft assembly, wherein a front end cover is installed at the front end of the housing, a rear end cover is installed at the rear end of the housing, an automatic door is provided on the front end cover, and a guide plate, a supercharged housing, an axial displacement detection assembly for detecting the axial displacement of the rotating shaft assembly, a front magnetic bearing assembly, a stator assembly, and a rear magnetic bearing assembly are installed in the housing from front to back. The rotating shaft assembly comprises a core shaft a, a core shaft b, a connecting sleeve, and a magnetic steel, and the core shaft a passes through the guide plate, the supercharged housing, the axial displacement detection assembly, and the inner ring of the front bearing assembly in sequence. The beneficial effects of the present invention are that the radial displacement adjustment and axial displacement adjustment of the rotating shaft both adopt a hybrid excitation structure, which reduces energy consumption while ensuring efficient refrigerant transportation and occupies a small space.

Description

Technical Field

[0001] The invention relates to refrigerant transportation of a central air conditioner, in particular to a magnetic levitation motor for refrigerant transportation. Background Art

[0002] The magnetic levitation motor has a high speed, so it can be used as an additional equipment in many fields. For example, in central air conditioning, existing central air conditioners usually use conventional power pumps to deliver wind power. Especially in severe cold weather and hot weather, the power of the power pump does not meet the requirements, which will lead to low cooling or heating efficiency of the central air conditioner and high energy consumption.

[0003] After long-term research, the inventor invented a magnetic levitation motor with hybrid excitation to replace the existing power pump, thereby achieving air pressurization and transportation with low energy consumption and high efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a magnetic levitation motor for refrigerant transportation.

[0005] The objectives of the present invention are achieved through the following technical solutions: A magnetic levitation motor for refrigerant transportation, comprising a housing and a rotating shaft assembly, wherein a front end cover is installed at the front end of the housing, a rear end cover is installed at the rear end of the housing, an automatic door is provided on the front end cover, and a guide plate, a boost housing, an axial displacement detection assembly for detecting the axial displacement of the rotating shaft assembly, a front magnetic bearing assembly, a stator assembly, and a rear magnetic bearing assembly are installed in the housing in order from front to back;

[0006] The rotating shaft assembly includes a core shaft a, a core shaft b, a connecting sleeve and a magnet. The magnet is installed in the connecting sleeve, and the core shaft a is installed at the front end of the connecting sleeve, and the core shaft b is installed at the rear end of the connecting sleeve. The connecting sleeve is located in the inner cavity of the stator assembly. The core shaft a passes through the guide plate, the supercharged housing, the axial displacement detection assembly, and the inner ring of the front bearing assembly in sequence. The front end of the core shaft a is equipped with a first impeller and a second impeller. The first impeller is located in the cavity of the front end cover, and the second impeller is located in the cavity of the supercharged housing. The cavity of the front end cover is connected to the cavity on the supercharged housing through the refrigerant flow channel on the guide plate. The outer side of the supercharged housing is provided with a refrigerant channel connected to its inner cavity, and the refrigerant channel is connected to the refrigerant outlet on the casing;

[0007] The rear magnetic bearing assembly includes a shell, which is installed in the casing, an outer cavity is opened on the front end surface of the shell, an inner step cavity is opened on the rear end surface of the shell, a radial displacement detection assembly for detecting the radial displacement of the core shaft b is installed in the outer cavity, and a radial magnetic bearing stator assembly, a permanent magnet assembly and an axial displacement adjustment assembly are installed in the inner step cavity from front to back; the permanent magnet assembly includes a permanent magnet and a magnetic disk, the permanent magnet is installed on the end surface of the disk, and the disk is installed on the step of the step cavity; the radial magnetic bearing stator assembly includes a magnetic outer shell, a radial magnetic bearing stator is installed in the magnetic outer shell, the front end surface of the magnetic outer shell abuts the bottom of the step cavity, and the magnetic outer shell is magnetically connected to the permanent magnet; the axial displacement adjustment assembly includes a magnetic end cover, and the end cover is installed on the magnetic An accommodating cavity is provided on the rear end surface of the disk and the front end surface of the end cover. A non-magnetic mounting bracket is also installed on the rear end surface of the disk, the mounting bracket is located in the accommodating cavity, a coil is wound on the mounting bracket, the inner ring edge of the disk protrudes toward the end cover and forms a convex ring a, the inner ring edge of the end cover protrudes from the disk and forms a convex ring b, the core shaft b passes through the inner ring of the radial displacement detection assembly, the inner ring of the radial magnetic bearing stator, the inner ring of the disk, and the inner ring of the end cover in sequence, and there is a gap between the core shaft b and the inner ring of the radial displacement detection assembly, the inner ring of the radial magnetic bearing stator, the inner ring of the disk, and the inner ring of the end cover, a thrust disk is mounted on the core shaft b, the disk body of the thrust disk is located between the convex ring a and the convex ring b, and there is a gap between the disk body of the thrust disk and the rear end surface of the convex ring a and the front end surface of the convex ring b;

[0008] The front magnetic bearing assembly includes a mounting shell, which is installed in the machine casing. A permanent magnet assembly and a radial magnetic bearing stator assembly are installed in the mounting shell. The permanent magnet assembly is located at the front end of the radial magnetic bearing stator assembly, and the permanent magnet of the permanent magnet assembly is connected to the magnetic conductive outer shell of the radial magnetic bearing stator assembly.

[0009] Optionally, the axial displacement detection component includes a mounting plate, which is mounted in the casing, a fixed shell b is mounted in the mounting plate, a radial through-hole b is radially opened on the fixed shell, a radial displacement detector is installed in the radial through-hole b, a mounting groove is opened on the fixed shell b, an axial column is axially arranged in the mounting groove, an axial through-hole is opened on the axial column, an axial displacement detector is installed in the axial through-hole, a disk to be tested is mounted on the core shaft a, the disk to be tested is located on the rear side of the second impeller, and the disk to be tested is located in the inner cavity of the fixed shell b, there is an axial gap between the disk to be tested and the fixed shell b, a plastic-sealed module b is also plastic-sealed in the mounting groove, and the axial displacement detector and the radial displacement detector are both held in the plastic-sealed module b.

[0010] Optionally, a plurality of axially distributed sealing grooves are provided on the inner wall of the inner cavity of the fixed shell b.

[0011] Optionally, a non-magnetic mounting bracket is installed on the front end surface of the disk, the outer surface of the mounting bracket is circular, and a number of separators evenly distributed within the same circumference are radially opened on the outer surface of the mounting bracket, and a fan-shaped groove is formed between two adjacent separators. There are multiple permanent magnets in a fan shape, and the permanent magnets are stuck in the corresponding fan-shaped grooves.

[0012] Optionally, a non-magnetic protective cover is mounted on the inner ring of the magnetic disk, and a gap is provided between the inner ring of the protective cover and the outer surface of the sleeve of the thrust disk.

[0013] Optionally, a radial magnetic bearing punching sheet a is mounted on the sleeve of the thrust plate, and the radial magnetic bearing punching sheet a is located in the inner ring of the radial magnetic bearing stator.

[0014] Optionally, the radial gap between the inner ring of the radial magnetic bearing stator and the outer ring of the radial magnetic bearing punching sheet a is greater than the radial gap between the inner ring of the protective sleeve and the outer surface of the sleeve.

[0015] Optionally, the radial displacement detection component includes a fixed shell a, a radial through hole a is radially opened on the fixed shell a, a radial displacement detector is installed in the radial through hole a, an annular groove is opened on the rear end face of the fixed shell a, a plastic package module a is installed in the annular groove, and the radial displacement detector is held in the plastic package module a, a card slot is also opened on the front end face of the shell, the card slot is connected to the external cavity, a notch is opened on the fixed shell, an outlet terminal is provided on the plastic package module a, the outlet terminal passes through the notch, and the outlet terminal is stuck in the card slot.

[0016] Optionally, a bearing seat is installed in the inner ring of the end cover, a support bearing is installed in the bearing seat, the rear end of the core shaft b passes through the inner ring of the support bearing, and there is a radial gap between the rear end of the core shaft b and the inner ring of the support bearing.

[0017] Optionally, a sealing ring is also installed on the core shaft a, and the sealing ring is located between the first impeller and the second impeller. A number of axially spaced sealing grooves are provided on the outer circle of the sealing ring, and the sealing ring is located in the inner ring of the guide plate, and there is a gap between the outer circle of the sealing ring and the inner ring of the guide plate.

[0018] The present invention has the following advantages:

[0019] 1. The magnetic levitation motor of the present invention utilizes a hybrid excitation structure for adjusting the radial displacement of the rotating shaft. When the sizes of the same set of coils in the radial magnetic bearing stator are changed, the hybrid excitation formed by the magnetic field of one coil and the permanent magnetic field increases, while the hybrid excitation formed by the magnetic field of the other coil and the permanent magnetic field decreases. This makes the radial displacement adjustment of the rotating shaft highly efficient. Furthermore, due to the presence of the permanent magnetic field, the power consumption required for radial displacement of the rotating shaft is also reduced. Therefore, the current flowing into the coil is smaller than that of existing magnetic levitation motors, resulting in low energy consumption of the radial displacement adjustment component.

[0020] 2. In the magnetic levitation motor of the present invention, the axial displacement adjustment of the rotating shaft adopts a hybrid excitation structure, which only requires one coil, thereby making the axial thrust component small in size and low in energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0023] Figure 3 Schematic diagram of the structure of the rear magnetic bearing assembly Figure 1 ;

[0024] Figure 4 Schematic diagram of the structure of the rear magnetic bearing assembly Figure 2 ;

[0025] Figure 5 is a schematic cross-sectional view of the rear magnetic bearing assembly;

[0026] Figure 6 Schematic diagram of the shell structure Figure 1 ;

[0027] Figure 7 Schematic diagram of the shell structure Figure 2 ;

[0028] Figure 8 Schematic diagram of the connection between the radial magnetic bearing stator assembly and the permanent magnet assembly;

[0029] Figure 9 for Figure 8 A cross-sectional schematic diagram;

[0030] Figure 10 Schematic diagram of the structure of the permanent magnet assembly;

[0031] Figure 11 It is a structural diagram of the mounting bracket;

[0032] Figure 12 It is a structural schematic diagram of the axial displacement adjustment component;

[0033] Figure 13 for Figure 12 A cross-sectional schematic diagram;

[0034] Figure 14 Schematic diagram of the structure of the radial magnetic bearing stator assembly;

[0035] Figure 15 It is a structural schematic diagram of the radial displacement detection component;

[0036] Figure 16Schematic diagram of the installation of the axial displacement detection component and the core shaft a;

[0037] Figure 17 It is a structural schematic diagram of the axial displacement detection component;

[0038] Figure 18 This is an exploded diagram of the axial displacement detection component;

[0039] Figure 19 Schematic diagram of the structure of the shaft assembly;

[0040] Figure 20 is a cross-sectional schematic diagram of the rotating shaft assembly;

[0041] Figure 21 It is a structural schematic diagram of the core shaft b;

[0042] Figure 22 is a schematic cross-sectional view of the core shaft b;

[0043] Figure 23 Schematic diagram of the structure of the connecting sleeve;

[0044] Figure 24 for Figure 20 A magnified schematic diagram of point A in the middle;

[0045] Figure 25 is a schematic cross-sectional view of a limiting convex portion;

[0046] Figure 26 Schematic diagram of the structure of the front magnetic bearing assembly

[0047] Figure 27 A cross-sectional view of the front magnetic bearing assembly

[0048] In the figure, 1- housing, 2- front cover, 3- rear cover, 4- automatic door, 5- guide plate, 6- boost housing, 7- stator assembly, 8- rear magnetic bearing assembly, 9- front magnetic bearing assembly, 91- mounting shell, 10- core shaft a, 20- core shaft b, 30- connecting sleeve, 40- magnetic steel, 50- thrust plate, 11- threaded hole, 12- connecting shaft a, 13- disk to be tested, 14- bushing a, 15- radial magnetic bearing punch Plate b, 16-bushing b, 21-connecting shaft b, 22-limiting slot, 23-limiting inclined surface, 31-limiting convex portion, 32-inner inclined surface, 33-abutting surface, 34-outer inclined surface, 41-first impeller, 42-second impeller, 43-bushing c, 44-sealing ring, 701-fixed shell b, 702-mounting groove, 703-radial through hole b, 704-axial column, 705-axial through hole, 706-plastic encapsulation mold Block b, 707-mounting plate, 100-rotating shaft assembly, 200-radial displacement detection assembly, 300-radial magnetic bearing stator assembly, 400-permanent magnet assembly, 500-axial displacement adjustment assembly, 600-housing, 700-axial displacement detection assembly, 201-fixed shell a, 202-radial perforation a, 203-plastic sealing module a, 204-outlet terminal, 301-magnetic housing, 302-radial magnetic bearing Stator, 303-radial magnetic bearing punching sheet a, 401-disk, 402-permanent magnet, 403-mounting bracket, 404-separator, 405-sector groove, 406-convex ring a, 407-protective sleeve, 501-end cover, 503-mounting frame, 504-accommodating cavity, 505-convex ring b, 601-outer cavity, 602-inner step cavity, 603-slot, 610-bearing seat, 620-support bearing. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0051] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0052] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0053] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0054] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0055] like Figure 1 and Figure 2 As shown, a magnetic levitation motor for refrigerant transportation includes a casing 1 and a shaft assembly 100. A front end cover 2 is installed at the front end of the casing 1, and a rear end cover 3 is installed at the rear end of the casing 1. An automatic door 4 is provided on the front end cover 2. Preferably, the automatic door 4 is an IGV automatic door 4, which can automatically adjust the size of the refrigerant inlet through the automatic door 4. A guide plate 5, a booster housing 6, an axial displacement detection assembly 700 for detecting the axial displacement of the shaft assembly 100, a front magnetic bearing assembly 9, a stator assembly 7 and a rear magnetic bearing assembly 8 are installed in the casing 1 from front to back. Figures 19 to 25As shown, the shaft assembly 100 includes a shaft, and the shaft includes a core shaft a10, a core shaft b20, a connecting sleeve 30 and a magnetic steel 40. The magnetic steel 40 is installed in the connecting sleeve 30, and the core shaft a10 is installed at the front end of the connecting sleeve 30, and the core shaft b20 is installed at the rear end of the connecting sleeve 30. The connecting sleeve 30 is located in the inner cavity of the stator assembly 7. The core shaft a10 passes through the guide plate 5, the supercharged housing 6, the axial displacement detection assembly 700, and the inner ring of the front bearing assembly in sequence. The front end of the core shaft a10 is installed with a first impeller 41 and a second impeller 42. The first impeller 41 is located in the cavity of the front end cover 2, and the second impeller 42 is located in the cavity of the front end cover 2. The second impeller 42 is located in the cavity of the supercharged shell 6, and the cavity of the front end cover 2 is connected to the cavity on the supercharged shell 6 through the refrigerant flow channel on the guide plate 5. The outside of the supercharged shell 6 is provided with a refrigerant channel connected to its inner cavity, and the refrigerant channel is connected to the refrigerant outlet on the casing 1; when the magnetic levitation motor is working, the refrigerant enters from the automatic door 4, and then enters the cavity of the front end cover 2 through the first impeller 41, and then enters the supercharged shell 6 through the refrigerant flow channel. Under the action of the second impeller 42, the refrigerant enters the refrigerant outlet of the casing 1 through the refrigerant channel, and then flows out through the refrigerant outlet.

[0056] In this embodiment, if Figure 21 and Figure 22 As shown, the core shaft b20 has a connecting shaft b21, the connecting shaft a12 is sleeved on one end of the connecting sleeve 30, the connecting shaft b21 is sleeved on the other end of the connecting sleeve 30, the magnetic steel 40 is sleeved in the connecting sleeve 30, and one end face of the magnetic steel 40 abuts against the connecting shaft a12, and the other end face of the magnetic steel 40 abuts against the connecting shaft b21. A limiting protrusion 31 is provided on the end face of the connecting sleeve 30 connected to one end of the core shaft b20, and a limiting groove 22 corresponding to the limiting protrusion 31 is opened on the step surface of the core shaft b20. Figure 24 As shown, the limiting protrusion 31 is stuck in the limiting groove 22. During assembly, the magnetic steel 40 is first installed in the connecting sleeve 30, and the magnetic steel 40 and the connecting sleeve 30 are interference fit. Then the connecting shaft a12 and the connecting shaft b21 are respectively installed in the connecting sleeve 30, and the connecting shaft a12 and the connecting sleeve 30 are interference fit, and the connecting shaft b21 and the connecting sleeve 30 are interference fit. During the rotation of the rotating shaft, since the rotating shaft is in a suspended state, the resistance in the circumferential direction is small. Therefore, the core shaft a10, the core shaft b20 and the connecting sleeve 30 are interference fit, so that the synchronous rotation of the core shaft a10, the core shaft b20, the magnetic steel 40 and the connecting sleeve 30 can be achieved. When the magnetic steel 40 rotates under the action of the magnetic force, it can drive the core shaft a10, the core shaft b20 and the connecting sleeve 30 to rotate. In this embodiment, as shown in FIG. Figure 25As shown, the cross section of the limiting protrusion 31 is trapezoidal, and the limiting protrusion 31 has a contact surface 33, an outer inclined surface 34 and an inner inclined surface 32. The outer side of the contact surface 33 is connected to the outer inclined surface 34, and the inner side of the contact surface 33 is connected to the inner inclined surface 32. The limiting card slot 22 has a limiting inclined surface 23. After the limiting protrusion 31 is clamped in the limiting card slot 22, the inner inclined surface 32 cooperates with the limiting inclined surface 23, and the contact surface 33 is against the bottom of the limiting card slot 22. The clamping connection increases the contact area between the end face of the connecting sleeve 30 and the step surface of the core shaft b20. When the core shaft a10 and the core shaft b20 are subjected to unequal forces, the core shaft b20 will exert an external force on the connecting sleeve 30. The external force has a component in the radial direction. After the limiting inclined surface 23 and the outer cooperative surface cooperate, part of the external force can be offset, so that the end face of the connecting sleeve 30 and the step surface of the core shaft b20 are not easily deformed, thereby improving the service life of the rotating shaft.

[0057] In this embodiment, the first impeller 41, the second impeller 42, the disc to be tested 13, the bushing b16 and the bushing a14 are installed on the core shaft a10 from front to back, and the bushing a14 is installed with a radial magnetic bearing punching b15. The front end face and the rear end face of the disc to be tested 13 are both provided with annular grooves, wherein the annular groove at the front end is abutted with a gasket a, and the annular groove at the rear end is abutted with a gasket b. Both gasket a and gasket b are mounted on the core shaft a10, and the front end face of gasket a is abutted with the rear end face of the second impeller 42, and the rear end face of gasket b is abutted with the bushing b16.

[0058] In this embodiment, a threaded hole 11 is axially opened in the center of the end surface of the core shaft a10 away from the connecting sleeve 30, and the impeller is sleeved on the core shaft a10 and locked by screws.

[0059] In this embodiment, if Figure 3 、 Figure 4 and Figure 5 As shown, the rear magnetic bearing assembly 8 includes a housing 600, and a thrust plate 50 is mounted on the core shaft b20. Figure 6 and Figure 7 As shown, an outer cavity 601 is defined on the front end surface of the housing 600, and an inner step cavity 602 is defined on the rear end surface of the housing 600. A radial displacement detection assembly 200 for detecting the radial displacement of the core shaft b20 is installed in the outer cavity 601, and a radial magnetic bearing stator assembly 300, a permanent magnet assembly 400, and an axial displacement adjustment assembly 500 are sequentially installed in the inner step cavity 602 from front to back.

[0060] In this embodiment, if Figure 10As shown, the permanent magnet assembly 400 includes a permanent magnet 402 and a magnetic disk 401. The permanent magnet 402 is mounted on the front end surface of the disk 401, and the disk 401 is mounted on the step of the step cavity. Furthermore, the permanent magnet 402 is very fragile. If it is directly made into a round shape, its processing difficulty and processing cost are high, and it is not easy to install and transport. Therefore, in this embodiment, as shown in FIG. Figure 10 and Figure 11 As shown, a non-magnetic mounting bracket 403 is mounted on the front end surface of the disk 401. The outer surface of the mounting bracket 403 is circular, and a plurality of separators 404 are radially opened on the outer surface of the mounting bracket 403 and are uniformly distributed on the same circumference. A sector groove 405 is formed between two adjacent separators 404. There are multiple permanent magnets 402 in a sector shape. The permanent magnets 402 are stuck in the corresponding sector grooves 405. Preferably, there are twelve permanent magnets 402 and they are uniformly distributed on the same circumference. That is, there are twelve uniformly distributed permanent magnets 402 on the mounting bracket 403. When installing the fan-shaped slots 405 on the same circumference, the corresponding permanent magnets 402 can be installed in the corresponding fan-shaped slots 405. When the permanent magnets 402 are installed in the fan-shaped slots 405, the permanent magnets 402 are distributed on the same circumference under the limiting effect of the fan-shaped slots 405. The permanent magnets 402 are processed into a fan shape, which is not difficult to process. Compared with the circular permanent magnets 402, the structural strength is higher. Moreover, when one of the permanent magnets 402 is damaged, it can be directly replaced with a new permanent magnet 402, thereby saving operating costs.

[0061] In this embodiment, if Figure 14 As shown, the radial magnetic bearing stator assembly 300 includes a magnetic housing 301, in which a radial magnetic bearing stator 302 is installed. The front end surface of the magnetic housing 301 abuts against the bottom of the step cavity, as shown in FIG. Figure 8 As shown, the rear end face of the magnetic shell 301 is magnetically connected to the permanent magnet 402. The magnetic shell 301 has an inner hole, and a step is provided on the inner hole. The radial magnetic bearing punching piece a303 is installed in the inner hole by interference fit, and the rear end face of the magnetic bearing is against the step. The radial magnetic bearing stator 302 belongs to the prior art. In this embodiment, there are four coils on the radial magnetic bearing stator 302, and the four coils are evenly distributed on the same circumference, that is, the four coils are distributed in the upper, lower, left and right directions, and the two adjacent coils are spaced apart. The two opposite coils are a group, and the two coils in the same group are connected in series.

[0062] In this embodiment, if Figure 8 and Figure 9As shown, the core shaft b20 passes through the radial magnetic bearing stator 302 and the magnetic disk 401, and the magnetic disk 401 is located on the rear side of the radial magnetic bearing stator 302. There is a gap between the core shaft b20 and the inner ring of the radial magnetic bearing stator 302 and the inner ring of the magnetic disk 401. The permanent magnet 402 is magnetically connected to the magnetic conductive housing 301. In this embodiment, the permanent magnet 402 and the magnetic disk 401 form a first magnetic circuit, and the permanent magnet 402 and the magnetic conductive housing 301 and the radial magnetic bearing stator 302 form a third magnetic circuit. When the coil is energized, the coil generates a magnetic field. In the same set of coils, , the magnetic field of one coil is superimposed on the magnetic field of the permanent magnet, while the magnetic field of the other coil is offset by the magnetic field of the permanent magnet, that is, when the current of the coil is changed, the force generated by the change of the coil current can act twice on the core shaft b20, so that the radial position adjustment of the core shaft b20 is efficient. Specifically, when the core shaft b20 is in a balanced state, that is, when the core shaft b20 rotates in the center, the magnetic field attraction on the core shaft b20 is in a balanced state. At this time, the core shaft b20 always rotates in the center. When the core shaft b20 has radial deviation, such as the core shaft b20 deflects upward, at this time, the gap between the core shaft b20 and the upper part of the inner ring of the radial magnetic bearing stator 302 will be reduced. At this time, if the magnetic field generated by the upper coil is superimposed on the permanent magnetic field, the current passing through the coil will be reduced. At this time, the magnitude of the mixed excitation of the magnetic field of the upper coil and the permanent magnetic field on the core shaft b20 will become smaller, while the magnitude of the mixed excitation of the magnetic field of the lower coil and the permanent magnetic field on the core shaft b20 will increase. In other words, the upper suction force on the core shaft b20 will become smaller, and the lower suction force on the core shaft b20 will become larger, thereby making the core shaft b20 The shaft B20 moves downward, thereby realizing the reset of the core shaft B20. If the magnetic field generated by the upper coil and the permanent magnetic field cancel each other out, the current flowing into the coil is increased, and the magnitude of the mixed excitation of the magnetic field of the upper coil and the permanent magnetic field on the core shaft B20 becomes smaller, while the magnitude of the mixed excitation of the magnetic field of the lower coil and the permanent magnetic field on the core shaft B20 increases. In other words, the upper suction force on the core shaft B20 becomes smaller, and the lower suction force on the core shaft B20 becomes larger, thereby causing the core shaft B20 to move downward, thereby realizing the reset of the core shaft B20.

[0063] In this embodiment, if Figure 9As shown, a thrust disk 50 is mounted on the core shaft b20, and a radial magnetic bearing punch a303 is mounted on the sleeve of the thrust disk 50. The radial magnetic bearing punch a303 is located in the inner ring of the radial magnetic bearing stator 302, and the sleeve and the core shaft b20 are installed by interference fit. Furthermore, a non-magnetic protective sleeve 407 is also installed on the inner ring of the magnetic disk 401. There is a gap between the inner ring of the protective sleeve 407 and the outer surface of the sleeve of the thrust disk 50. The radial gap between the inner ring of the radial magnetic bearing stator 302 and the outer ring of the radial magnetic bearing punch a303 is greater than the radial gap between the inner ring of the protective sleeve 407 and the outer surface of the sleeve. Therefore, when the core shaft b20 is installed, the protective sleeve 407 can protect the inner ring of the magnetic bearing stator to avoid collision between the core shaft b20 and the inner ring of the magnetic bearing stator.

[0064] In this embodiment, if Figure 12 and Figure 13As shown, the axial displacement adjustment component 500 includes a magnetic end cover 501, which is installed on the rear end surface of the magnetic disk 401. A receiving cavity 504 is provided on the front end surface of the end cover 501. A non-magnetic mounting bracket 503 is also installed on the rear end surface of the magnetic disk 401. The mounting bracket 503 is located in the receiving cavity 504. A coil is wound on the mounting bracket 503. The inner ring edge of the magnetic disk 401 protrudes toward the end cover 501 and forms a convex ring a406. The inner ring edge of the end cover 501 protrudes from the magnetic disk 401 and forms a convex ring b505. There is a gap between the convex ring a406 and the convex ring b505 to accommodate the disk body of the thrust disk 50, and the thrust disk 50 There is a gap between the disk body and the rear end face of the convex ring a406 and the front end face of the convex ring b505. Preferably, the disk body of the thrust disk 50 is located in the through hole around which the coil is wound. When in use, the permanent magnet 402 and the magnetic disk 401 form a first magnetic circuit, and the first magnetic circuit applies magnetic attraction to the thrust disk 50 through the convex ring a406, while the permanent magnet 402, the magnetic disk 401 and the end cover 501 form a second magnetic circuit, and the second magnetic circuit applies magnetic attraction to the thrust disk 50 through the convex ring b505. Therefore, the front and rear end faces of the thrust disk 50 are both subjected to suction, and the thrust disk 50 reaches balance under the suction of the two magnetic circuits. After the thrust disk 50 is initially installed, the thrust disk Under the suction of the first magnetic circuit and the second magnetic circuit, there is a gap between the thrust disc 50 and the rear end face of the convex ring a406, and there is a gap between the thrust disc 50 and the front end face of the convex ring a406. In the working state, when the shaft moves axially, since the thrust disc 50 is mounted on the shaft, when the shaft moves axially, the thrust disc 50 will also move axially. After the shaft moves axially, it can be detected by the axial displacement detection component 700 in the magnetic levitation motor. The axial displacement detection component 700 belongs to the existing technology and will not be described in detail. Then the axial displacement detection component 700 will feedback the detected structure. The control system of the magnetic levitation motor is energized, and the control system energizes the coil, which then generates a thrust on the thrust disk 50, thereby resetting the thrust disk 50. Specifically, when the distance between the thrust disk 50 and the convex ring a406 is reduced, the coil is energized, applying a backward thrust to the thrust disk 50, thereby resetting the thrust disk 50. After the thrust disk 50 is reset, the coil is de-energized. Similarly, when the distance between the thrust disk 50 and the convex ring a406 increases, the coil is energized, applying a forward thrust to the thrust disk 50, thereby resetting the thrust disk 50. After the thrust disk 50 is reset, the coil is de-energized, thereby completing the adjustment of the axial displacement of the rotating shaft.

[0065] During the actual installation process, since the magnetic attraction forces exerted by the first magnetic circuit and the second magnetic circuit on the thrust disk 50 are different, the thrust disk 50 may move closer to the convex ring a406 or the convex ring b505. At this time, a small current can be passed through the coil to make the thrust disk 50 achieve force balance in the axial direction. For example, the attraction force of the first magnetic circuit is greater than the attraction force of the second magnetic circuit on the thrust disk 50. At this time, the coil is introduced into the small current, and the magnetic field generated by the coil applies a backward thrust to the thrust disk 50, thereby making the thrust disk 50 achieve force balance in the axial direction. When working, When the distance between the thrust disk 50 and the convex ring a406 is reduced, the current of the coil is increased, and the backward thrust on the thrust disk 50 is increased, so that the thrust disk 50 is reset. After the thrust disk 50 is reset, the coil returns to the initial current. Similarly, when the distance between the thrust disk 50 and the convex ring a406 is increased, the direction of the DC current integrated into the coil is changed, thereby applying a forward thrust to the thrust disk 50, so that the thrust disk 50 is reset. After the thrust disk 50 is reset, the coil returns to the initial current, thereby completing the adjustment of the axial displacement of the rotating shaft.

[0066] In this embodiment, if Figure 13 As shown, an annular groove is provided on the mounting frame 503, and the coil is wound in the annular groove, so that the coil is easy to install. Moreover, in this embodiment, the adjustment of the axial displacement of the rotating shaft can be achieved by combining the first magnetic circuit and the second magnetic circuit with only one coil, without the need to use two coils, thereby reducing the volume of the magnetic levitation motor. Moreover, the magnetic field of the permanent magnet and the magnetic field formed by the coil are mixed together to form a hybrid excitation. The axial force acting on the thrust plate 50 is adjusted by the hybrid excitation, thereby reducing energy consumption.

[0067] In this embodiment, if Figure 15 As shown, the radial displacement detection component 200 includes a fixed shell a201, and a radial through-hole a202 is radially opened on the fixed shell a201. A radial displacement detector is installed in the radial through-hole a202. Preferably, there are four radial through-holes a202, and they are evenly distributed on the same circumference. That is to say, when the radial displacement detector is installed in the radial through-hole a202, the four radial displacement detectors are orthogonally distributed, and the two opposite radial displacement detectors form a group. When in use, when a radial displacement detector in the same group detects that the distance between the core shaft b20 and it becomes smaller, then the other radial displacement detector in the same group detects that the distance between the core shaft b20 and it becomes larger. Then, the distance change value detected by the radial displacement detector can be used to accurately calculate the displacement of the core shaft b20. Furthermore, there are four coils on the radial magnetic bearing stator 302, which are also divided into two groups. The two groups of coils correspond to the two groups of radial displacement detectors one by one, and then the radial displacement of the core shaft b20 is accurately and efficiently adjusted through the control system of the magnetic levitation motor.

[0068] In this embodiment, if Figure 15 As shown, an annular groove is provided on the rear end face of the fixed shell a201, and a plastic encapsulation module a203 is installed in the annular groove, and the radial displacement detector is fixed in the plastic encapsulation module a203. During installation, the radial displacement detector is installed in the radial perforation a202, and then the plastic encapsulation material is poured into the annular groove. When the plastic encapsulation module a203 is completed, the radial displacement detector is fixed in the plastic encapsulation module a203, thereby ensuring the stability of the position of the radial displacement detector, thereby ensuring the reliability of the use of the radial displacement detector. Furthermore, a card slot 603 is also provided on the front end face of the shell 600, and the card slot 603 is connected to the outer cavity 601. A notch is provided on the fixed shell a201, and an outlet terminal 204 is provided on the plastic encapsulation module a203. The outlet terminal 204 passes through the notch and is stuck in the card slot 603.

[0069] In this embodiment, if Figure 5 As shown, a bearing seat 610 is also installed in the inner ring of the end cover 501, and a support bearing 620 is installed in the bearing seat 610. The rear end of the core shaft b20 passes through the inner ring of the support bearing 620, and there is a radial gap between the rear end of the core shaft b20 and the inner ring of the support bearing 620. When the magnetic levitation motor stops working, the rotating shaft stops rotating. At this time, the core shaft b20 is supported by the support bearing 620. Furthermore, the radial gap between the rear end of the core shaft b20 and the inner ring of the support bearing 620 is smaller than the radial gap between the inner ring of the protective sleeve 407 and the sleeve, and the radial gap between the inner ring of the protective sleeve 407 and the sleeve is smaller than the radial gap between the radial magnetic bearing punching a303 and the inner ring of the radial magnetic bearing stator 302. Therefore, when the core shaft b20 falls on the support bearing 620, the radial magnetic bearing punching a303 will not contact the inner ring of the radial magnetic bearing stator 302, thereby being able to well protect the inner ring of the radial magnetic bearing stator 302.

[0070] In this embodiment, if Figure 2 、 Figure 26 and Figure 27 As shown, the front magnetic bearing assembly 9 includes a mounting shell 91, which is installed in the casing 1. The permanent magnet assembly 400 and the radial magnetic bearing stator assembly 300 are installed in the mounting shell 91. The permanent magnet assembly 400 is located at the front end of the radial magnetic bearing stator assembly 300, and the permanent magnet 402 of the permanent magnet assembly 400 is connected to the magnetic conductive shell 301 of the radial magnetic bearing stator assembly 300, and the radial magnetic bearing punching b15 is located in the inner ring of the radial magnetic bearing stator assembly 300.

[0071] In this embodiment, if Figure 16 、 Figure 17 and Figure 18As shown, the axial displacement detection assembly 700 includes a mounting plate 707, which is mounted in the casing 1, a fixed shell b701 is mounted in the mounting plate 707, a radial through-hole b703 is radially opened on the fixed shell, a radial displacement detector is mounted in the radial through-hole b703, a mounting groove 702 is opened on the fixed shell b701, an axial column 704 is axially arranged in the mounting groove 702, an axial through-hole 705 is opened on the axial column 704, an axial displacement detector is mounted in the axial through-hole 705, a disc to be tested 13 is mounted on the core shaft a10, the disc to be tested 13 is located on the rear side of the second impeller 42, and the disc to be tested 13 is located in the fixed shell b701. In the inner cavity, there is an axial gap between the disk to be tested 13 and the fixed shell b701, the core shaft a10 is arranged in the inner ring of the fixed shell b701, and there is an axial gap between the core shaft b20 and the fixed shell b701. When the core shaft a10 moves axially, the disk to be tested 13 can detect the axial displacement of the core shaft a10, and then feed back the information to the control system of the magnetic levitation motor. The control system of the magnetic levitation motor controls the axial displacement detection component 700 to adjust the axial displacement of the rotating shaft. Furthermore, a plastic-sealed module b706 is also plastic-sealed in the mounting groove 702, and the axial displacement detector and the radial displacement detector are both held in the plastic-sealed module b706.

[0072] In this embodiment, a plurality of axially distributed sealing grooves are provided on the inner wall of the inner cavity of the fixed shell b701. When the shaft rotates, a dynamic seal is formed between the fixed shell b701 and the disk to be tested 13.

[0073] In this embodiment, if Figure 19 and Figure 20 As shown, a sealing ring 44 is also installed on the core shaft a10, and the sealing ring 44 is located between the first impeller 41 and the second impeller 42, and a bushing c43 is installed between the sealing ring 44 and the first impeller 41. A plurality of axially spaced sealing grooves are provided on the outer circle of the sealing ring 44, and the sealing ring 44 is located in the inner circle of the guide plate 5, and there is a gap between the outer circle of the sealing ring 44 and the inner circle of the guide plate 5. When the shaft rotates, a dynamic seal is formed between the sealing ring 44 and the guide plate 5.

[0074] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A magnetic levitation motor for refrigerant transportation, comprising a housing and a rotating shaft assembly, wherein a front end cover is mounted at the front end of the housing, a rear end cover is mounted at the rear end of the housing, and an automatic door is provided on the front end cover, characterized in that: The casing is provided with a guide plate, a pressurized housing, an axial displacement detection assembly for detecting the axial displacement of the rotating shaft assembly, a front magnetic bearing assembly, a stator assembly and a rear magnetic bearing assembly in sequence from front to back; The rotating shaft assembly includes a core shaft a, a core shaft b, a connecting sleeve and a magnetic steel, the magnetic steel is installed in the connecting sleeve, and the core shaft a is installed at the front end of the connecting sleeve, the core shaft b is installed at the rear end of the connecting sleeve, the connecting sleeve is located in the inner cavity of the stator assembly, the core shaft a passes through the guide plate, the supercharged housing, the axial displacement detection assembly, and the inner ring of the front bearing assembly in sequence, the front end of the core shaft a is installed with a first impeller and a second impeller, the first impeller is located in the cavity of the front end cover, the second impeller is located in the cavity of the supercharged housing, and the cavity of the front end cover and the cavity on the supercharged housing are connected through the refrigerant on the guide plate. The flow channel is connected, and a refrigerant channel connected to its inner cavity is provided on the outer side of the pressurized shell, and the refrigerant channel is connected to the refrigerant outlet on the casing; a limiting convex portion is provided on the end face of one end of the connecting core shaft b on the connecting sleeve, and a limiting groove corresponding to the limiting convex portion is provided on the step surface of the core shaft b, and the limiting convex portion is clamped in the limiting groove, and the cross-section of the limiting convex portion is trapezoidal, and the limiting convex portion has an abutting surface, an outer bevel and an inner bevel, the outer side of the abutting surface is connected to the outer bevel, and the inner side of the abutting surface is connected to the inner bevel, and the limiting groove has a limiting bevel, and after the limiting convex portion is clamped in the limiting groove, the inner bevel cooperates with the limiting bevel, and the abutting surface abuts against the bottom of the limiting groove; The rear magnetic bearing assembly includes a shell, which is installed in the casing, an outer cavity is opened on the front end surface of the shell, and an inner step cavity is opened on the rear end surface of the shell, a radial displacement detection assembly for detecting the radial displacement of the core shaft b is installed in the outer cavity, and a radial magnetic bearing stator assembly, a permanent magnet assembly and an axial displacement adjustment assembly are installed in the inner step cavity from front to back; the permanent magnet assembly includes a permanent magnet and a magnetic disk, the permanent magnet is installed on the end surface of the disk, and the disk is installed on the step of the step cavity; the radial magnetic bearing stator assembly includes a magnetic outer shell, a radial magnetic bearing stator is installed in the magnetic outer shell, the front end surface of the magnetic outer shell abuts the bottom of the step cavity, and the magnetic outer shell is magnetically connected to the permanent magnet; the axial displacement adjustment assembly includes a magnetic end cover, and the end cover is installed at the rear end of the disk The magnetic disk is located in the magnetic field of the magnetic disk and has a plurality of guide rings, each of which is provided with a plurality of guide rings, and the guide rings are connected to the magnetic disk via a plurality of guide rings. The front magnetic bearing assembly includes a mounting shell, which is mounted in the housing. A permanent magnet assembly and a radial magnetic bearing stator assembly are mounted in the mounting shell. The permanent magnet assembly is located at the front end of the radial magnetic bearing stator assembly, and the permanent magnet of the permanent magnet assembly is connected to the magnetic conductive housing of the radial magnetic bearing stator assembly. A non-magnetic mounting bracket is installed on the front end surface of the disk. The outer surface of the mounting bracket is circular, and a plurality of separators uniformly arranged in the same circumference are radially opened on the outer surface of the mounting bracket. A fan-shaped groove is formed between two adjacent separators. There are multiple permanent magnets in a fan shape, and the permanent magnets are stuck in the corresponding fan-shaped grooves.

2. The magnetic levitation motor for refrigerant transportation according to claim 1, characterized in that: The axial displacement detection assembly includes a mounting disk, which is mounted in the casing, a fixed shell b is mounted in the mounting disk, a radial through-hole b is radially provided on the fixed shell, a radial displacement detector is installed in the radial through-hole b, a mounting groove is provided on the fixed shell b, an axial column is axially provided in the mounting groove, an axial through-hole is provided on the axial column, an axial displacement detector is installed in the axial through-hole, a disk to be tested is mounted on the core shaft a, the disk to be tested is located on the rear side of the second impeller, and the disk to be tested is located in the inner cavity of the fixed shell b, an axial gap is provided between the disk to be tested and the fixed shell b, a plastic-sealed module b is also plastic-sealed in the mounting groove, and the axial displacement detector and the radial displacement detector are both held in the plastic-sealed module b.

3. The magnetic levitation motor for refrigerant transportation according to claim 2, characterized in that: A plurality of axially distributed sealing grooves are provided on the inner wall of the inner cavity of the fixed shell b.

4. The magnetic levitation motor for refrigerant transportation according to claim 3, characterized in that: A non-magnetic protective cover is also mounted on the inner ring of the magnetic disk, and a gap is provided between the inner ring of the protective cover and the outer surface of the sleeve of the thrust disk.

5. The magnetic levitation motor for refrigerant transportation according to claim 4, characterized in that: A radial magnetic bearing punching sheet a is sleeved on the sleeve of the thrust plate, and the radial magnetic bearing punching sheet a is located in the inner ring of the radial magnetic bearing stator.

6. The magnetic levitation motor for refrigerant transportation according to claim 5, characterized in that: The radial gap between the inner ring of the radial magnetic bearing stator and the outer ring of the radial magnetic bearing punching sheet a is larger than the radial gap between the inner ring of the protective sleeve and the outer surface of the sleeve.

7. The magnetic levitation motor for refrigerant transportation according to claim 6, characterized in that: The radial displacement detection component includes a fixed shell a, a radial through-hole a is radially opened on the fixed shell a, a radial displacement detector is installed in the radial through-hole a, an annular groove is opened on the rear end surface of the fixed shell a, a plastic package module a is installed in the annular groove, and the radial displacement detector is retained in the plastic package module a, a card slot is also opened on the front end surface of the shell, the card slot is connected to the external cavity, a notch is opened on the fixed shell, an outlet terminal is provided on the plastic package module a, the outlet terminal passes through the notch, and the outlet terminal is clamped in the card slot.

8. The magnetic levitation motor for refrigerant transportation according to claim 7, characterized in that: A bearing seat is also installed in the inner ring of the end cover, and a support bearing is installed in the bearing seat. The rear end of the core shaft b passes through the inner ring of the support bearing, and there is a radial gap between the rear end of the core shaft b and the inner ring of the support bearing.

9. The magnetic levitation motor for refrigerant transportation according to claim 1, characterized in that: A sealing ring is also installed on the core shaft a, and the sealing ring is located between the first impeller and the second impeller. A plurality of axially spaced sealing grooves are provided on the outer circle of the sealing ring, and the sealing ring is located in the inner ring of the guide plate, and there is a gap between the outer circle of the sealing ring and the inner ring of the guide plate.

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