Two-stage compression magnetic suspension air compressor

Abstract

The utility model provides a two-stage compression magnetic suspension air compressor which comprises a compressor shell, a motor stator, a rotor, a first impeller assembly and a second impeller assembly, the first impeller assembly and the second impeller assembly can bear axial magnetic acting force, and the compressor shell, the motor stator and the rotor are sequentially arranged in a sleeved mode. The two ends of the rotor are rotatably connected into the compressor shell through magnetic suspension bearing sets, and the first impeller assembly and the second impeller assembly are oppositely and fixedly installed at the two ends of the rotor respectively. The magnetic suspension bearing set comprises a first thrust bearing part for generating first axial magnetic acting force on the first impeller assembly and a second thrust bearing part for generating second axial magnetic acting force on the second impeller assembly, and the direction of the first axial magnetic acting force is opposite to that of the second axial magnetic acting force. A conventional thrust disc structure can be omitted, so that the critical rotating speed of the rotor is increased, and the pressure value of compressed air of the magnetic suspension air compressor is effectively increased.

Description

Technical Field

[0001] The present application relates to the field of magnetic suspension compressors, and in particular to a two-stage compression magnetic suspension air compressor. Background Art

[0002] Nowadays, in order to improve the air compression capacity of centrifugal compressors, three-stage or above compression structures are often used. At the same time, in order to improve the compression efficiency, high-speed motor direct drive technology is generally chosen, and traditional bearing mechanical bearings are upgraded and replaced with oil-free non-contact bearings, such as magnetic levitation bearings.

[0003] The magnetic levitation air compressor uses electromagnetic levitation technology, which uses magnetic force to make the rotor and stator of the air compressor levitate without contact. The magnets and coils inside the magnetic levitation motor constitute the static and dynamic parts respectively. When the coil passes through the current, a magnetic field is generated. This magnetic field interacts with the magnets on the rotor to generate an upward levitation force. This levitation force is equal to the gravity of the rotor, so that the rotor is suspended in the air. When the current changes direction, the direction of the magnetic field will also change, thereby generating different levitation forces, realizing the reciprocating motion of the rotor, and then driving the compression mechanism to work.

[0004] When the magnetic levitation air compressor is in operation, in order to prevent the rotating shaft of the magnetic levitation air compressor from moving axially due to the effect of axial force, most of the existing magnetic levitation air compressors are equipped with a front radial magnetic bearing, a rear radial magnetic bearing and an axial magnetic bearing on the outside of the rotor main shaft in sequence, and then a thrust plate is arranged between the axial magnetic bearings. Therefore, additional space is required inside the existing centrifugal compressor to install the thrust plate. This will cause the length of the rotating shaft of the magnetic levitation air compressor to increase accordingly, reducing the critical speed of the rotating shaft of the magnetic levitation air compressor. Summary of the invention

[0005] The purpose of the present application is to provide a two-stage compression magnetic suspension air compressor without a thrust plate structure, which shortens the rotating shaft and increases the critical speed of the rotating shaft.

[0006] A two-stage compression magnetic suspension air compressor, comprising: a compressor housing, a motor stator, a rotor, a first impeller assembly and a second impeller assembly that can be subjected to an axial magnetic force, wherein the compressor housing, the motor stator and the rotor are sequentially sleeved, and both ends of the rotor are rotatably connected to the compressor housing through a magnetic suspension bearing group, and the first impeller assembly and the second impeller assembly are fixedly mounted on both ends of the rotor respectively relative to each other;

[0007] The magnetic bearing group includes: a first thrust bearing component that generates a first axial magnetic force on the first impeller assembly, and a second thrust bearing component that generates a second axial magnetic force on the second impeller assembly, and the first axial magnetic force is in opposite directions to the second axial magnetic force.

[0008] Compared with the prior art, the present application provides a two-stage compression magnetic levitation air compressor, in which a first impeller and a second impeller that can be subjected to axial magnetic force are fixedly installed relatively on the rotating shaft at both ends of the rotor, and a first thrust bearing component and a second thrust bearing component are provided. The magnetic field is generated by the first thrust bearing component and the second thrust bearing component, respectively generating a first axial magnetic force and a second axial magnetic force on the first impeller, thereby offsetting the axial force generated by the rotating shaft when the rotating shaft rotates at high speed; the present application provides a two-stage compression magnetic levitation air compressor that can eliminate the thrust plate structure used to offset the axial force of the rotating shaft in a conventional magnetic levitation air compressor, thereby shortening the length of the rotor and the entire machine, improving the rigidity of the rotor, thereby increasing the critical speed of the rotor, and effectively increasing the pressure value of the compressed air in the magnetic levitation air compressor.

[0009] Furthermore, the first thrust bearing component and the first impeller assembly are respectively arranged adjacent to each other along the axial direction of the rotor, and the first thrust bearing component is located inside the first impeller assembly; the second thrust bearing component and the second impeller assembly are respectively arranged adjacent to each other along the axial direction of the rotor, and the second thrust bearing component is located inside the second impeller assembly. By arranging the first thrust bearing component and the second thrust bearing component adjacent to the first impeller assembly and the second impeller assembly respectively, away from the electromagnetic field area of ​​the motor stator, the temperature of the first thrust bearing component and the second thrust bearing component will not exceed their maximum tolerance temperature, thereby reducing the heat dissipation requirements for the first thrust bearing component and the second thrust bearing component.

[0010] Furthermore, the first impeller assembly includes a first impeller made of magnetic material; the second impeller assembly includes a second impeller made of magnetic material; when the first thrust bearing component and the second thrust bearing component generate a magnetic field, the first axial magnetic force and the second axial magnetic force are respectively generated on the first impeller assembly and the second impeller assembly made of magnetic material, so that the first impeller and the second impeller offset the axial force generated when the rotating shaft at both ends of the rotor rotates at high speed.

[0011] Alternatively, the first impeller assembly includes a first impeller and a first magnetic member, the first magnetic member is installed in the first impeller; the second impeller assembly includes a second impeller and a second magnetic member, the second magnetic member is installed in the second impeller. When the first thrust bearing member and the second thrust bearing member generate a magnetic field, the first axial magnetic force and the second axial magnetic force are generated on the first magnetic member and the second magnetic member respectively, so that the first impeller and the second impeller can offset the axial force generated when the rotor rotates at a high speed.

[0012] Furthermore, the first magnetic attraction component and the second magnetic attraction component are both magnets, ferromagnetic metals or ferromagnetic alloys; a first groove is provided at the bottom of the first impeller, and the first magnetic attraction component is snap-fitted and installed in the first groove; a second groove is provided at the bottom of the second impeller, and the second magnetic attraction component is snap-fitted and installed in the second groove.

[0013] Furthermore, the first magnetic component and the second magnetic component are both magnetic coatings, and the first magnetic component is evenly coated on the bottom of the first impeller; the second magnetic component is evenly coated on the bottom of the second impeller. When the first thrust bearing component and the second thrust bearing component generate a magnetic field, the first axial magnetic force and the second axial magnetic force are respectively generated on the first impeller and the second impeller evenly coated with the magnetic coating, so that the first impeller assembly and the second impeller assembly can offset the axial force generated when the rotating shafts at both ends of the rotor rotate at high speed, saving the processing cost of the first impeller and the second impeller.

[0014] Furthermore, it also includes a first shield and a second shield, one end of the first shield and the second shield are respectively assembled at the two ends of the compressor housing; the first thrust bearing component and the second thrust bearing component are respectively assembled at the ends of the first shield and the second shield away from the compressor housing, and the two ends of the rotor are respectively passed through the first shield and the second shield, the first thrust bearing component and the second thrust bearing component and then assembled with the corresponding impeller assembly, and there is a movable gap between the first thrust bearing component and the second thrust bearing component and the bottom of the corresponding impeller assembly.

[0015] Furthermore, the magnetic bearing group also includes a first radial bearing component and a second radial bearing component, the first radial bearing component and the second radial bearing component are respectively installed in the first shield and the second shield, the two ends of the rotor pass through the first radial bearing component and the second radial bearing component, and the first radial bearing component is arranged between the first thrust bearing component and the motor stator, and the second radial bearing component is arranged between the second thrust bearing component and the motor stator.

[0016] Furthermore, it also includes a first position detection device and a second position detection device, which are respectively installed in the first shield and the second shield; the first position detection device is arranged between the first thrust bearing component and the first radial bearing component; the second position detection device is arranged between the second thrust bearing component and the second radial bearing component.

[0017] Further, it includes a first volute, a second volute, and a first airflow diffuser assembly and a second airflow diffuser assembly, wherein the first volute is close to one side of the first shield and is detachably assembled with the first shield; the second volute is close to one side of the second shield and is detachably assembled with the second shield; the first airflow diffuser assembly and the second airflow diffuser assembly are respectively installed in the first volute and the second volute, and the centers of the first airflow diffuser assembly and the second airflow diffuser assembly are respectively provided with a first impeller mounting hole and a second impeller mounting hole, and the first impeller assembly and the second impeller assembly pass through the first impeller mounting hole and the second impeller mounting hole, respectively, and are arranged in the first volute and the second volute; and an air inlet gap is respectively provided between the first impeller assembly and the second impeller assembly and the first impeller mounting hole and the second impeller mounting hole. The first impeller assembly and the second impeller assembly rotate at high speed to make the air rotate at high speed and enter the first volute and the second volute through the air inlet gap, and after the first airflow diffuser assembly and the second airflow diffuser assembly assist in pressurizing the high-speed rotating air, the compressed air comes out of the first volute and the second volute.

[0018] Further, the first volute and the second volute are respectively provided with a first airflow diffuser assembly mounting position and a second airflow diffuser assembly mounting position, the first airflow diffuser assembly includes a first annular base and at least one first wind shield arranged on one end of the first annular base, the end of the first annular base where the first wind shield is not provided is matched and installed with the first airflow diffuser assembly mounting position, the first impeller mounting through hole is provided at the center of the first annular base, the first wind shields are arranged circumferentially and spaced apart along the first impeller mounting through hole, and the arrangement direction of the first wind shields is opposite to the bending direction of the multiple arc-shaped blades on the first impeller assembly; the second airflow diffuser assembly includes a second annular base and at least one second wind shield arranged on one end of the second annular base, the end of the second annular base where the second wind shield is not provided is matched and installed with the second airflow diffuser assembly mounting position, the second impeller mounting through hole is provided at the center of the second annular base, the second wind shields are arranged circumferentially and spaced apart along the second impeller mounting through hole, and the arrangement direction of the second wind shields is opposite to the bending direction of the multiple arc-shaped blades on the second impeller assembly. By bending the multiple arc-shaped blades on the first impeller assembly and the second impeller assembly in a direction opposite to the arrangement direction of the wind shields on the first airflow diffuser assembly and the second airflow diffuser assembly, the rotation direction of the high-speed rotating air entering the first volute and the second volute can be made consistent with the arrangement direction of the wind shields on the first airflow diffuser and the second airflow diffuser, respectively, thereby achieving auxiliary pressurization of the air.

[0019] In order to provide a clearer understanding of the present application, the specific implementation of the present application will be described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a two-stage compression magnetic suspension air compressor of the present application;

[0021] Figure 2 This is a cross-sectional schematic diagram of a two-stage compression magnetic suspension air compressor of the present application;

[0022] Figure 3 This is a partial structural schematic diagram of a two-stage compression magnetic suspension air compressor of the present application;

[0023] Figure 4 This is a schematic structural diagram of a first impeller assembly of a two-stage compression magnetic suspension air compressor of the present application;

[0024] Figure 5 This is a schematic structural diagram of a second impeller assembly of a two-stage compression magnetic suspension air compressor of the present application;

[0025] Figure 6A partial exploded schematic diagram of a first impeller assembly, a first volute, a first thrust bearing, a first shield, a first position detection device, a first sensing component and a first radial bearing in a two-stage compression magnetic suspension air compressor of the present application;

[0026] Figure 7 A partial exploded schematic diagram of a second impeller assembly, a second volute, a second thrust bearing, a second shield, a second position detection device, a second sensing component, and a second radial bearing in a two-stage compression magnetic suspension air compressor of the present application;

[0027] Figure 8 This is a partial exploded schematic diagram of a first protective cover, a first position detection device and a first radial bearing member in a two-stage compression magnetic suspension air compressor of the present application;

[0028] Fig. 9 A partial exploded schematic diagram of a second shield, a second position detection device, and a second radial bearing member in a two-stage compression magnetic suspension air compressor of the present application;

[0029] Fig.10 This is a schematic diagram of an explosion of a first volute in a two-stage compression magnetic suspension air compressor of the present application;

[0030] Fig.11 This is a schematic diagram of an explosion of a second volute in a two-stage compression magnetic levitation air compressor of the present application. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present application. It is understood that the drawings are only provided for reference and illustration, and are not used to limit the present application. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0033] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as those generally understood by technicians in the technical field to which this application belongs. It should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or the internal connection of two components. For ordinary technicians in this field, the above terms can be understood in specific circumstances in this utility model.

[0034] The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0035] It should also be noted that in the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] See also Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a two-stage compression magnetic suspension air compressor of this application. Figure 2 This is a cross-sectional schematic diagram of a two-stage compression magnetic suspension air compressor of the present application. Figure 3 This is a schematic diagram of the partial structure of a two-stage compression magnetic levitation air compressor of the present application.

[0037] The present application provides a two-stage compression magnetic suspension air compressor 1, comprising a compressor housing 101, a motor stator 102, a rotor 103, a first impeller assembly 104 and a second impeller assembly 105 that can be subjected to an axial magnetic force, wherein the compressor housing 101, the motor stator 102 and the rotor 103 are sequentially sleeved, and both ends of the rotor 103 are rotatably connected to the compressor housing 101 through a magnetic suspension bearing group 106, and the first impeller assembly 104 and the second impeller assembly 105 are fixedly mounted on both ends of the rotor 103 relatively to each other;

[0038] The magnetic bearing group 106 includes: a first thrust bearing component 106a for generating a first axial magnetic force on the first impeller assembly 104, and a second thrust bearing component 106b for generating a second axial magnetic force on the second impeller assembly 105, wherein the first axial magnetic force is opposite to the second axial magnetic force in direction.

[0039] The two-stage compression magnetic levitation air compressor 1 has the first impeller assembly 104 and the second impeller assembly 105 which can be subjected to the axial magnetic force fixedly installed at both ends of the rotor 103, and is provided with the first thrust bearing 106a and the second thrust bearing 106b. When the first thrust bearing 106a and the second thrust bearing 106b generate a magnetic field, they respectively generate the first axial magnetic force and the second axial magnetic force on the first impeller assembly 104 and the second impeller assembly 105. The vector sum of the first axial magnetic force and the second axial magnetic force can offset the axial force generated by the rotor 103 when rotating at high speed. The two-stage compression magnetic levitation air compressor 1 provided in the present application can omit the thrust plate structure used to offset the axial force of the rotor 103 in the conventional magnetic levitation air compressor, so that the length of the rotor 103 and the whole machine can be shortened, the rigidity of the rotor 103 is improved, the critical speed of the rotor is improved, and the pressure value of the compressed air of the magnetic levitation air compressor 1 is effectively improved.

[0040] In this embodiment, the first thrust bearing component 106a and the first impeller assembly 104 are respectively arranged adjacent to each other along the axial direction of the rotor 103, and the first thrust bearing component 106a is located on the inner side of the first impeller assembly 104; the second thrust bearing component 106b and the second impeller assembly 105 are respectively arranged adjacent to each other along the axial direction of the rotor 103, and are located on the inner side of the second impeller assembly 105 with the second thrust bearing component 106b.

[0041] By arranging the first thrust bearing component 106a and the second thrust bearing component 106b adjacent to the first impeller assembly 104 and the second impeller assembly 105 respectively, and away from the electromagnetic field area generated by the motor stator 102, when the two-stage compression magnetic levitation air compressor 1 is in operation, the eddy current phenomenon of the first thrust bearing component 106a and the second thrust bearing component 106b in the electromagnetic field area generated by the motor stator 102 can be reduced, so that the temperature of the first thrust bearing component 106a and the second thrust bearing component 106b will not exceed their maximum tolerance temperature, thereby reducing the heat dissipation demand of the first thrust bearing component 106a and the second thrust bearing component 106b, and there is no need to additionally set up a heat dissipation device for the first thrust bearing component 106a and the second thrust bearing component 106b to dissipate the heat of the first thrust bearing component 106a and the second thrust bearing component 106b. While effectively saving costs, compared with the case where the heat dissipation device of the first thrust bearing component 106a and the heat dissipation device of the second thrust bearing component 106b are installed, since no additional space is required to install the heat dissipation device of the first thrust bearing component 106a and the heat dissipation device of the second thrust bearing component 106b, the length of the rotor 103 and the entire machine can be shortened, the rigidity of the rotor 103 is improved, thereby increasing the critical speed of the rotor 103, and effectively increasing the pressure value of the compressed air of the magnetic levitation air compressor 1.

[0042] In other embodiments, the first thrust bearing component 106a may also be located outside the first impeller assembly 104; the second thrust bearing component 106b may also be located outside the second impeller assembly 105. Alternatively, the first thrust bearing component 106a and the first impeller assembly 104 may not be arranged adjacent to each other, but other structures such as a cooling structure may be arranged in the middle; the second thrust bearing component 106b and the second impeller assembly 105 may not be arranged adjacent to each other, but other structures such as a cooling structure may be arranged in the middle.

[0043] See also Figure 4 and Figure 5 , Figure 4 This is a schematic structural diagram of a first impeller assembly of a two-stage compression magnetic suspension air compressor of the present application; Figure 5 This is a schematic diagram of the structure of the second impeller assembly of a two-stage compression magnetic levitation air compressor of the present application. In this embodiment, the first impeller assembly 104 includes a first impeller 104a made of a magnetic material; the second impeller assembly 105 includes a second impeller 105a made of a magnetic material. The magnetic material is a ferromagnetic metal or a ferromagnetic alloy, preferably 17-4 stainless steel. Of course, in other embodiments, according to actual needs, the magnetic material can also be selected as other magnetic materials such as nickel-iron alloy.

[0044] When the first thrust bearing 106a and the second thrust bearing 106b generate a magnetic field, the first impeller 104a and the second impeller 105a are respectively subjected to the first axial magnetic force and the second axial magnetic force in the magnetic field generated by the first thrust bearing 106a and the second thrust bearing 106b, wherein the direction of the first axial magnetic force is opposite to the direction of the second axial magnetic force. In one embodiment, the direction in which the first axial magnetic force is applied to the first impeller 104a is an axially inward suction force along the rotor 103, and the direction in which the second axial magnetic force is applied to the second impeller 105a is an axially inward suction force along the rotor 103. The vector sum of the first axial magnetic force and the second axial magnetic force is used to offset the axial force generated by the rotor 103 when rotating at high speed. This can effectively prevent the first impeller and the second impeller from being scratched and damaged due to the axial deviation of the rotor 103.

[0045] In other embodiments, the first impeller 104a is subjected to the first axial magnetic force in the direction of an outward thrust along the axial direction of the rotor 103, and the second impeller 105a is subjected to the second axial magnetic force in the direction of an outward thrust along the axial direction of the rotor 103. The vector sum of the first axial magnetic force and the second axial magnetic force is used to offset the axial force generated by the rotor 103 when rotating at a high speed.

[0046] The two-stage compression magnetic levitation air compressor 1 provided in the present application replaces the thrust plate structure with the first impeller 104a and the second impeller 105a, thereby eliminating the thrust plate structure used to offset the axial force of the rotating shaft in the conventional magnetic levitation air compressor, that is, there is no need to set up additional space in the two-stage compression magnetic levitation air compressor 1 to install the thrust plate structure, so that the length of the rotor 103 and the entire machine can be shortened, the rigidity of the rotor 103 is improved, and the critical speed of the rotor 103 is increased, which can effectively increase the pressure value of the compressed air in the two-stage compression magnetic levitation air compressor 1.

[0047] In another embodiment, the first impeller assembly 104 includes a first impeller 104a and a first magnetic member 104b, wherein the first magnetic member 104b is installed in the first impeller 104a; the second impeller assembly 105 includes a second impeller 105a and a second magnetic member 105b, wherein the second magnetic member 105b is installed in the second impeller 105a. In this embodiment, the first impeller assembly 104 and the second impeller assembly 105 may not be made of magnetic materials as a whole, but only the first magnetic member 104b and the second magnetic member 105b disposed therein may be made of magnets or magnetic materials.

[0048] Among them, the first magnetic member 104b and the second magnetic member 105b can be magnets, ferromagnetic metals or ferromagnetic alloys, preferably 17-4 stainless steel, the first impeller 104a is provided with a first groove 104c at the bottom, and the first magnetic member 104b is snap-fitted and installed in the first groove 104c; the second impeller 105a is provided with a second groove 105c at the bottom, and the second magnetic member 105b is snap-fitted and installed in the second groove 105c. In one embodiment, the first groove 104c and the second groove 105c are annular grooves, and the first magnetic member 104b and the second magnetic member 105b are also annular. Of course, according to actual needs, the first magnetic member 104b and the second magnetic member 105b can also be selected from other magnetic materials such as nickel-iron alloy, and the first groove 104c and the second groove 105c can also be square grooves, etc., and the shapes of the first magnetic member 104b and the second magnetic member 105b are adjusted accordingly according to the shapes of the first groove 104c and the second groove 105c.

[0049] When the first thrust bearing 106a and the second thrust bearing 106b generate a magnetic field, the first magnetic member 104b and the second magnetic member 105b having magnetic properties will be subjected to the first axial magnetic force and the second axial magnetic force respectively in the magnetic field generated by the first thrust bearing 106a and the second thrust bearing 106b, wherein the direction of the first axial magnetic force is opposite to the direction of the second axial magnetic force. The direction in which the first axial magnetic force is applied to the first magnetic member 104b is an axial inward suction force along the rotor 103, and the first axial magnetic force applied to the first magnetic member 104b acts on the first impeller 104a; the direction in which the second axial magnetic force is applied to the second magnetic member 105b is an axial inward suction force along the rotor 103, and the second axial magnetic force applied to the second magnetic member 105b acts on the second impeller 105a. The vector sum of the first axial magnetic force and the second axial magnetic force is used to offset the axial force generated by the rotor 103 when rotating at high speed. This effectively prevents the first impeller 104a and the second impeller 105a from being scratched and damaged due to the axial deviation of the rotor 103.

[0050] In other embodiments, the direction of the first axial magnetic force on the first magnetic member 104b is an outward thrust along the axial direction of the rotor 103, and the first axial magnetic force on the first magnetic member 104b acts on the first impeller 104a; the direction of the second axial magnetic force on the second magnetic member 105b is an outward thrust along the axial direction of the rotor 103, and the second axial magnetic force on the second magnetic member 105b acts on the second impeller 105a. The vector sum of the first axial magnetic force and the second axial magnetic force is used to offset the axial force generated by the rotor 103 when rotating at high speed.

[0051] In other embodiments, the first magnetic member 104b and the second magnetic member 105b may both be magnetic coatings, and the first magnetic member 104b is evenly coated on the bottom of the first impeller 104a; the second magnetic member 105b is evenly coated on the bottom of the second impeller 104a.

[0052] See also Figure 6 and Figure 7 , Figure 6 A partial exploded schematic diagram of a first impeller assembly, a first volute, a first thrust bearing, a first shield, a first position detection device, a first sensing component and a first radial bearing in a two-stage compression magnetic suspension air compressor of the present application; Figure 7 A partial exploded schematic diagram of a second impeller assembly, a second volute, a second thrust bearing, a second shield, a second position detection device, a second sensing component and a second radial bearing in a two-stage compression magnetic levitation air compressor of the present application.

[0053] In this embodiment, the two-stage compression magnetic levitation air compressor 1 also includes a first shield 107 and a second shield 108, one end of the first shield 107 and the second shield 108 are respectively assembled at the two ends of the compressor housing 101; the first thrust bearing component 106a and the second thrust bearing component 106b are respectively assembled at the ends of the first shield 107 and the second shield 108 away from the compressor housing 101, and the two ends of the rotor 103 are respectively passed through the first shield 107 and the second shield 108, the first thrust bearing component 106a and the second thrust bearing component 106b and then assembled with the corresponding impeller assembly, and there is a movable gap between the first thrust bearing component 106a and the second thrust bearing component 106b and the bottom of the corresponding impeller assembly.

[0054] The first and second shields 107 and 108 are respectively provided with a first thrust bearing mounting hole 107a and a second thrust bearing mounting hole 108a at two ends away from the compressor housing 101. The first thrust bearing mounting hole 107a and the second thrust bearing mounting hole 108a are preferably screw holes, and the first thrust bearing 106a and the second thrust bearing 106b are mounted in the first thrust bearing mounting hole 107a and the second thrust bearing mounting hole 108a by screw fixing. Of course, in other embodiments, in order to improve the stability of the first thrust bearing component 106a and the second thrust bearing component 106b respectively assembled on the first shield 107 and the second shield 108 at one end away from the compressor casing 101, the first thrust bearing component mounting hole 107a and the second thrust bearing component mounting hole 108a can also be bolt holes, and the first thrust bearing component 106a and the second thrust bearing component 106b are installed in the first thrust bearing component mounting hole 107a and the second thrust bearing component mounting hole 108a by bolt fixing.

[0055] See also Figure 8 and Fig. 9 , Figure 8 This is a partial exploded schematic diagram of a first protective cover, a first position detection device and a first radial bearing member in a two-stage compression magnetic suspension air compressor of the present application; Fig. 9 This is a partial exploded schematic diagram of a second shield, a second position detection device, and a second radial bearing member in a two-stage compression magnetic levitation air compressor of the present application. In one embodiment, the first shield 107 is provided with a first position detection device mounting portion 107b and a first radial bearing member mounting portion 107c in sequence in a direction away from the first impeller assembly 104. The second shield 108 is provided with a second position detection device mounting portion 108b and a second radial bearing member mounting portion 108c in sequence in a direction away from the second impeller assembly 105.

[0056] The magnetic suspension bearing group 106 further includes a first radial bearing component 106c and a second radial bearing component 106d, and the first radial bearing component 106c and the second radial bearing component 106d are respectively mounted on the first radial bearing component mounting portion 107c and the second radial bearing component mounting portion 108c, so as to be mounted in the first shield 107 and the second shield 108. Both ends of the rotor 103 pass through the first radial bearing component 106c and the second radial bearing component 106d, and the first radial bearing component 106c is arranged between the first thrust bearing component 106a and the motor stator 102, and the second radial bearing component 106d is arranged between the second thrust bearing component 106b and the motor stator 102. The first radial bearing component 106c and the second radial bearing component 106d are used to generate a magnetic field to achieve contactless suspension between the rotor 103 and the motor stator 102.

[0057] In this embodiment, the two-stage compression magnetic levitation air compressor 1 also includes a first position detection device 109 and a second position detection device 110, and the first position detection device 109 and the second position detection device 110 are respectively installed on the first position detection device installation portion 107b and the second position detection device installation portion 108b, so as to be installed in the first shield 107 and the second shield 108; the first position detection device 109 is arranged between the first thrust bearing component 106a and the first radial bearing component 106c, and is arranged adjacent to the first radial bearing component 106c; the second position detection device 110 is arranged between the second thrust bearing component 106b and the second radial bearing component 106d, and is arranged adjacent to the second radial bearing component 106d.

[0058] In other embodiments, the first position detection device 109 and the first radial bearing component 106c may not be arranged closely together, but other structures such as a cooling structure may be arranged in the middle; the second position detection device 110 and the second radial bearing component 106d may not be arranged closely together, but other structures such as a cooling structure may be arranged in the middle.

[0059] The two-stage compression magnetic levitation air compressor 1 further includes a first induction component 111 and a second induction component 112, which are respectively fixedly mounted on the rotating shafts at both ends of the rotor 103; the first position detection device 109 and the second position detection device 110 are respectively arranged around the first induction component 111 and the second induction component 112. The first induction component 111 and the second induction component 112 are respectively fixedly mounted on the rotating shafts at both ends of the rotor 103, so that the first induction component 111 and the second induction component 112 can rotate synchronously with the rotor 103. In one embodiment, the first induction component 111 and the second induction component 112 can be annular magnetic rings.

[0060] In one embodiment, the first position detection device 109 includes a speed sensor 109a and a first radial sensor 109b, and the second position detection device 110 includes a first axial sensor 110a, a second radial sensor 110b, and a second axial sensor 110c. The speed sensor 109a and the first radial sensor 109b are disposed adjacent to each other in the first position detection device mounting portion 107b along the axial direction of the rotor 103. The first axial sensor 110a, the second radial sensor 110b, and the second axial sensor 110c are disposed adjacent to each other in the second position detection device mounting portion 108b along the axial direction of the rotor 103.

[0061] The first axial sensor 110a and the second axial sensor 110c each include at least one axial sensor element and an axial sensor mounting ring whose inner diameter is greater than the diameter of the first sensing component 111. The number of the axial sensor elements is preferably 4. The inner ring of the axial sensor mounting ring protrudes toward the center to form at least one axial sensor element mounting boss. The number of the axial sensor element mounting bosses is correspondingly set to 4. The axial sensor element mounting bosses are symmetrically arranged with respect to the center of the axial sensor mounting ring. The axial sensor element is matched and mounted on the axial sensor element mounting bosses. Of course, according to actual needs, the number of the axial sensor elements can be adaptively adjusted, and the number of the axial sensor element mounting bosses can be adjusted accordingly.

[0062] The first radial sensor 109b and the second radial sensor 110b each include at least one radial sensor element and a radial sensor mounting ring whose inner diameter is greater than the diameter of the second sensing component 112, and the number of the radial sensor elements is preferably 4; the inner ring of the radial sensor mounting ring protrudes toward the center to form at least one radial sensor element mounting boss, and the number of the radial sensor element mounting bosses is correspondingly set to 4; the radial sensor element mounting bosses are symmetrically arranged with respect to the center of the radial sensor mounting ring; the radial sensor element is matched and mounted on the radial sensor element mounting bosses. Of course, according to actual needs, the number of the radial sensor elements can be adaptively adjusted, and the number of the radial sensor element mounting bosses can be adjusted accordingly.

[0063] The first radial sensor 109b can surround the first sensing component 111, so that the first radial sensor 109b is arranged circumferentially along the first sensing component 111, and the speed sensor 109a is spaced apart from the first radial sensor 109b; the first axial sensor 110a, the second radial sensor 110b, and the second axial sensor 110c can surround the second sensing component 112, so that the first axial sensor 110a, the second radial sensor 110b, and the second axial sensor 110c are sequentially spaced apart along the circumference of the second sensing component 112.

[0064] The speed sensor 109a and the first radial sensor 109b are sequentially arranged at intervals along the circumference of the first sensing component 111 to respectively detect the rotation speed and radial displacement of the first sensing component 111, thereby detecting the rotation speed and radial displacement of the rotor 103. The first axial sensor 110a, the second radial sensor 110b, and the second axial sensor 110c are sequentially arranged at intervals along the circumference of the second sensing component 112 to detect the axial displacement and radial displacement of the rotor 103.

[0065] In this embodiment, the first sensing component 111 at least includes a first sub-sensing component 111a and a second sub-sensing component 111b. The first sub-sensing component 111a and the second sub-sensing component 111b are arranged adjacent to each other in sequence along the axial direction of the rotor 103, and the first sub-sensing component 111a is provided with a notch; the speed sensor 109a is arranged corresponding to the first sub-sensing component 111a, and the first radial sensor 109b is arranged circumferentially along the second sub-sensing component 111b.

[0066] By arranging the speed sensor 109a corresponding to the first sub-sensing component 111a, the speed sensor 109a can detect the rotation frequency of the notch of the first sub-sensing component 111a to detect the rotation speed of the first sub-sensing component 111a, thereby obtaining the rotation speed of the rotor 103. By arranging the first radial sensor 109b along the circumferential direction of the second sub-sensing component 111b, when the rotor 103 undergoes radial displacement, the second sub-sensing component 111b will also undergo radial displacement synchronously, and the first radial sensor 109b will detect the change in the magnetic field when the second sub-sensing component 111b undergoes radial displacement, thereby realizing the detection of the radial displacement of the rotor 103.

[0067] The second sensing component 112 at least includes a third sub-sensing component 112a, a fourth sub-sensing component 112b and a fifth sub-sensing component 112c, the first axial sensor 110a is circumferentially arranged along the connection between the third sub-sensing component 112a and the fourth sub-sensing component 112b, the second radial sensor 110b is circumferentially arranged along the fourth sub-sensing component 112b, and the second axial sensor 110c is circumferentially arranged along the connection between the fourth sub-sensing component 112b and the fifth sub-sensing component 112c.

[0068] By arranging the first axial sensor 110a along the circumferential direction of the connection between the third sub-sensing component 112a and the fourth sub-sensing component 112b, and arranging the second axial sensor 110c along the circumferential direction of the connection between the fourth sub-sensing component 112b and the fifth sub-sensing component 112c. When the rotor 103 undergoes axial displacement, the third sub-sensing component 112a, the fourth sub-sensing component 112b and the fifth sub-sensing component 112c will also undergo axial displacement synchronously, and the first axial sensor 110a and the second axial sensor 110c will detect the magnetic field changes when the third sub-sensing component 112a, the fourth sub-sensing component 112b and the fifth sub-sensing component 112c undergo axial displacement, thereby realizing the detection of the axial displacement of the rotor 103. In the present application, the detection accuracy of the axial displacement of the rotor 103 is effectively improved by arranging the first axial sensor 110a and the second axial sensor 110c to simultaneously detect the axial displacement of the rotor 103. In other embodiments, the number of the axial sensors can be adaptively modified according to the actual detection accuracy requirements. By real-time detection of the axial displacement data of the rotor 103 and feeding it back to the controller, the controller will control the magnitude and direction of the current of the first thrust bearing component 106a and the second thrust bearing component 106b according to the feedback information, so that the first thrust bearing component 106a and the second thrust bearing component 106b generate the first axial magnetic force and the second axial magnetic force on the first impeller assembly 104 and the second impeller assembly 105 respectively, and the vector sum of the first axial magnetic force and the second axial magnetic force is used to offset the axial force generated by the rotor 103 when rotating at high speed, so that the rotor 103 is in a relatively stable position.

[0069] By arranging the second radial sensor 110b along the circumference of the fourth sub-sensing component 112b, when the rotor 103 undergoes radial displacement, the fourth sub-sensing component 112b will also undergo radial displacement synchronously, and the second radial sensor 110b will detect the magnetic field change when the fourth sub-sensing component 112b undergoes radial displacement, thereby realizing the detection of the radial displacement of the rotor 103. The present application simultaneously detects the radial displacement of the rotor 103 by arranging the first radial sensor 109b and the second radial sensor 110b, thereby effectively improving the detection accuracy of the radial displacement of the rotor 103. In other embodiments, the number of the radial sensors can be adaptively modified according to the actual detection accuracy requirements. By real-time detection of the radial displacement data of the rotor 103 and feeding it back to the controller, the controller will control the magnitude and direction of the current of the first radial bearing component 106c and the second radial bearing component 106d according to the feedback information, generate a magnetic force corresponding to the force on the rotor 103, and make the rotor 103 suspend in a relatively stable position.

[0070] See also Fig.10 and Fig.11 , Fig.10 This is a schematic diagram of an explosion of a first volute in a two-stage compression magnetic suspension air compressor of the present application; Fig.11 This is a schematic diagram of an explosion of a second volute in a two-stage compression magnetic levitation air compressor of the present application.

[0071] In one embodiment, the two-stage compression magnetic levitation air compressor 1 further includes a first volute 113, a second volute 114, a first airflow diffuser assembly 115, and a second airflow diffuser assembly 116. The first volute 113 is close to one side of the first shield 107 and is detachably assembled with the first shield 107; the second volute 114 is close to one side of the second shield 108 and is detachably assembled with the second shield 108; the first airflow diffuser assembly 115 and the second airflow diffuser assembly 116 are respectively installed on the first volute 113. In the second volute 114, the first impeller mounting through hole and the second impeller mounting through hole are respectively arranged at the center of the first airflow diffusion component 115 and the second airflow diffusion component 116, the first impeller component 104 and the second impeller component 105 respectively pass through the first impeller mounting through hole and the second impeller mounting through hole, and are arranged in the first volute 113 and the second volute 114; and the first impeller component 104 and the second impeller component 105 are respectively provided with air inlet gaps between the first impeller mounting through hole and the second impeller mounting through hole.

[0072] The first impeller assembly 104 or the second impeller assembly 105 rotates at a high speed to cause the air to rotate at a high speed and enter the first volute 113 or the second volute 114 through the air inlet gap. When the high-speed rotating air passes through the first airflow diffuser assembly 115 or the second airflow diffuser assembly 116, the first airflow diffuser assembly 115 or the second airflow diffuser assembly 116 assists in pressurizing the high-speed rotating air, and the compressed air comes out of the first volute 113 and the second volute 114 respectively.

[0073] In this embodiment, the first volute 113 and the second volute 114 are respectively provided with a first airflow diffusion component installation position and a second airflow diffusion component installation position. The first airflow diffusion component 115 comprises a first annular base 115a and at least one first wind shield 115b provided on one end of the first annular base 115a, the end of the first annular base 115a not provided with the first wind shield 115b is matched and installed with the first airflow diffusion component installation position, the first impeller installation hole 115c is provided at the center of the first annular base, the first wind shield 115b is arranged circumferentially and spaced along the first impeller installation hole 115c, the arrangement direction of the first wind shield 115b is opposite to the bending direction of the multiple arc-shaped blades on the first impeller assembly 104, the bending direction of the multiple arc-shaped blades on the first impeller assembly 104 is preferably clockwise, and the arrangement direction of the wind shields on the first airflow diffusion component 115 is preferably counterclockwise.

[0074] The second airflow diffusion component 116 includes a second annular base 116a and at least one second wind shield 116b arranged on one end of the second annular base, the end of the second annular base 116a not provided with the second wind shield 116b is installed to match the mounting position of the second airflow diffusion component, the center of the second annular base 116a is provided with the second impeller mounting hole 116c, the second wind shields 116b are arranged at intervals along the circumference of the second impeller mounting hole 116c, the arrangement direction of the second wind shield 116b is opposite to the bending direction of the multiple arc-shaped blades on the second impeller assembly 105, the bending direction of the multiple arc-shaped blades on the second impeller assembly 105 is preferably counterclockwise, and the arrangement direction of the second wind shield 116c is preferably clockwise.

[0075] When the first impeller assembly 104 rotates at a high speed, it drives the air to rotate clockwise at a high speed. Since the first airflow diffusion assembly 115 is installed by matching the first airflow diffusion assembly installation position with the end of the first annular base where the first wind shield 115b is not provided, that is, the first wind shield 115b and the arc-shaped blades on the first impeller assembly 104 are arranged in reverse, after the clockwise high-speed rotating air enters the first volute 113 through the air inlet gap, the rotation direction of the clockwise high-speed rotating air is consistent with the arrangement direction of the first airflow diffusion assembly 115, so that the clockwise high-speed rotating air can spirally rotate along the first wind shield 115b, thereby realizing the auxiliary pressurization of the air by the first airflow diffusion assembly 115. The principle of the auxiliary pressurization of the air by the second airflow diffusion assembly 116 is the same as the principle of the auxiliary pressurization of the air by the first airflow diffusion assembly 115, so it will not be repeated.

[0076] Of course, in other embodiments, while ensuring that the arrangement direction of the first wind shield 115b is opposite to the bending direction of the multiple curved blades on the first impeller assembly 104, and the arrangement direction of the second wind shield 116b is opposite to the bending direction of the multiple curved blades on the second impeller assembly 105, the arrangement direction of the wind shield on the first airflow diffusion assembly 115 and the arrangement direction of the wind shield on the second airflow diffusion assembly 116 can be adaptively modified.

[0077] The present application is not limited to the above-mentioned implementation modes. If various changes or modifications to the present application do not depart from the spirit and scope of the present application, and if these changes and modifications fall within the claims of the present application and the scope of equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A two-stage compression magnetic suspension air compressor, characterized in that: include: A compressor housing, a motor stator, a rotor, a first impeller assembly and a second impeller assembly that can be subjected to an axial magnetic force, wherein the compressor housing, the motor stator and the rotor are sequentially sleeved, and both ends of the rotor are rotatably connected to the compressor housing through a magnetic bearing group, and the first impeller assembly and the second impeller assembly are fixedly installed at both ends of the rotor relative to each other; The magnetic bearing group includes: a first thrust bearing component that generates a first axial magnetic force on the first impeller assembly, and a second thrust bearing component that generates a second axial magnetic force on the second impeller assembly, and the first axial magnetic force is in opposite directions to the second axial magnetic force.

2. A two-stage compression magnetic suspension air compressor according to claim 1, characterized in that: The first thrust bearing component and the first impeller assembly are respectively arranged adjacent to each other along the axial direction of the rotor, and the first thrust bearing component is located on the inner side of the first impeller assembly; the second thrust bearing component and the second impeller assembly are respectively arranged adjacent to each other along the axial direction of the rotor, and the second thrust bearing component is located on the inner side of the second impeller assembly.

3. A two-stage compression magnetic suspension air compressor according to claim 1, characterized in that: The first impeller assembly includes a first impeller made of a magnetic material; the second impeller assembly includes a second impeller made of a magnetic material; Alternatively, the first impeller assembly includes a first impeller and a first magnetic member, and the first magnetic member is installed in the first impeller; the second impeller assembly includes a second impeller and a second magnetic member, and the second magnetic member is installed in the second impeller.

4. A two-stage compression magnetic suspension air compressor according to claim 3, characterized in that: The magnetic material is ferromagnetic metal or ferromagnetic alloy.

5. A two-stage compression magnetic suspension air compressor according to claim 3, characterized in that: The first magnetic attraction component and the second magnetic attraction component are both magnets, ferromagnetic metals or ferromagnetic alloys; a first groove is provided at the bottom of the first impeller, and the first magnetic attraction component is snap-fitted and installed in the first groove; a second groove is provided at the bottom of the second impeller, and the second magnetic attraction component is snap-fitted and installed in the second groove.

6. A two-stage compression magnetic suspension air compressor according to claim 5, characterized in that: The first groove and the second groove are both annular grooves, and the first magnetic attraction member and the second magnetic attraction member are both annular.

7. A two-stage compression magnetic suspension air compressor according to claim 3, characterized in that: The first magnetic attraction member and the second magnetic attraction member are both magnetic coatings. The first magnetic attraction member is evenly coated on the bottom of the first impeller; the second magnetic attraction member is evenly coated on the bottom of the second impeller.

8. A two-stage compression magnetic suspension air compressor according to claim 1, characterized in that: It also includes a first shield and a second shield, one end of the first shield and the second shield are respectively assembled at the two ends of the compressor housing; the first thrust bearing component and the second thrust bearing component are respectively assembled at the ends of the first shield and the second shield away from the compressor housing, and the two ends of the rotor are respectively passed through the first shield and the second shield, the first thrust bearing component and the second thrust bearing component and then assembled with the corresponding impeller assembly, and there is a movable gap between the first thrust bearing component and the second thrust bearing component and the bottom of the corresponding impeller assembly.

9. A two-stage compression magnetic suspension air compressor according to claim 8, characterized in that: The magnetic bearing group also includes a first radial bearing component and a second radial bearing component, the first radial bearing component and the second radial bearing component are respectively installed in the first shield and the second shield, the two ends of the rotor pass through the first radial bearing component and the second radial bearing component, and the first radial bearing component is arranged between the first thrust bearing component and the motor stator, and the second radial bearing component is arranged between the second thrust bearing component and the motor stator.

10. A two-stage compression magnetic suspension air compressor according to claim 9, characterized in that: It also includes a first position detection device and a second position detection device, which are respectively installed in the first shield and the second shield; the first position detection device is arranged between the first thrust bearing component and the first radial bearing component; the second position detection device is arranged between the second thrust bearing component and the second radial bearing component.

11. A two-stage compression magnetic suspension air compressor according to claim 10, characterized in that: It also includes a first induction component and a second induction component, which are respectively fixedly mounted on the rotating shafts at both ends of the rotor; the first position detection device and the second position detection device are respectively arranged around the first induction component and the second induction component.

12. A two-stage compression magnetic suspension air compressor according to claim 11, characterized in that: The first position detection device includes a speed sensor and a first radial sensor, and the second position detection device includes a first axial sensor, a second radial sensor and a second axial sensor; the speed sensor and the first radial sensor are arranged in sequence along the circumferential direction of the first sensing component; the first axial sensor, the second radial sensor and the second axial sensor are arranged in sequence along the circumferential direction of the second sensing component.

13. A two-stage compression magnetic suspension air compressor according to claim 11, characterized in that: It includes a first volute, a second volute and a first airflow diffuser assembly and a second airflow diffuser assembly, the first volute is close to one side of the first shield and is detachably assembled with the first shield; the second volute is close to one side of the second shield and is detachably assembled with the second shield; the first airflow diffuser assembly and the second airflow diffuser assembly are respectively installed in the first volute and the second volute, and the first impeller mounting through hole and the second impeller mounting through hole are respectively provided at the center of the first airflow diffuser assembly and the second airflow diffuser assembly; the first impeller assembly and the second impeller assembly pass through the first impeller mounting through hole and the second impeller mounting through hole respectively, and are arranged in the first volute and the second volute; and air inlet gaps are respectively provided between the first impeller assembly and the second impeller assembly and the first impeller mounting through hole and the second impeller mounting through hole.

14. A two-stage compression magnetic suspension air compressor according to claim 13, characterized in that: The first volute and the second volute are respectively provided with a first airflow diffusion component mounting position and a second airflow diffusion component mounting position, the first airflow diffusion component includes a first annular base and at least one first wind shield arranged on one end of the first annular base, the end of the first annular base where the first wind shield is not provided is matched and installed with the first airflow diffusion component mounting position, the first impeller mounting through hole is provided at the center of the first annular base, the first wind shields are arranged circumferentially and spaced apart along the first impeller mounting through hole, and the arrangement direction of the first wind shields is opposite to the bending direction of the multiple arc-shaped blades on the first impeller assembly; the second airflow diffusion component includes a second annular base and at least one second wind shield arranged on one end of the second annular base, the end of the second annular base where the second wind shield is not provided is matched and installed with the second airflow diffusion component mounting position, the second impeller mounting through hole is provided at the center of the second annular base, the second wind shields are arranged circumferentially and spaced apart along the second impeller mounting through hole, and the arrangement direction of the second wind shields is opposite to the bending direction of the multiple arc-shaped blades on the second impeller assembly.

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