Centrifugal air compressor directly driven by axial magnetic flux motor

Abstract

The utility model provides a centrifugal air compressor directly driven by an axial magnetic flux motor, relates to the technical field of high-speed direct-driven air compressors, and solves the technical problem that heat in a motor is accumulated and cannot be effectively dissipated in the prior art. The device comprises an outer shell, a connecting body, a radial bearing, a permanent magnet assembly and a stator assembly, a mounting hole is formed in the center of the outer shell, the connecting body is arranged in the mounting hole through the radial bearing, the stator assembly is annularly arranged on the outer shell on the peripheral side of the mounting hole, the connecting body is connected with the permanent magnet assembly, and the permanent magnet assembly is located on one side of the stator assembly. An air inlet and an air outlet are formed in the outer shell, a first gap is formed between the radial bearing and the connecting body, a second gap is formed between the stator assembly and the permanent magnet assembly, and high-pressure gas can sequentially pass through the air inlet, the first gap, the second gap and the air outlet. According to the utility model, gas is introduced between the stator assembly and the permanent magnet assembly so as to achieve the heat dissipation effect of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of high-speed direct-driven air compressors, in particular to an axial flux motor direct-driven centrifugal air compressor. Background Art

[0002] In the field of air compression technology, centrifugal air compressors have attracted much attention due to their high flow and medium pressure output characteristics. Centrifugal air compressors driven by axial flux motors have high torque density and compactness. Due to the arrangement of the flux in the axial direction, axial flux motors are able to achieve similar or higher torque output than traditional motors in a smaller volume. However, due to the special structure of axial flux motors, their thermal management is more complicated than that of traditional radial flux motors. Heat is more likely to accumulate inside the motor, and if it is not effectively dissipated, it will cause the motor performance to deteriorate or even damage. Utility Model Content

[0003] The purpose of the utility model is to provide an axial flux motor direct-drive centrifugal air compressor, which solves the technical problem that the heat inside the motor cannot be effectively dissipated in the prior art. The preferred technical solution among the many technical solutions provided by the utility model can produce many technical effects as described below.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] The utility model provides an axial flux motor direct-drive centrifugal air compressor, comprising an outer shell, a connector, a radial bearing, a permanent magnet assembly and a stator assembly, wherein the outer shell has a mounting hole at its center, the connector is arranged in the mounting hole through the radial bearing, the stator assembly is arranged in a ring shape on the outer shell on the circumferential side of the mounting hole, the connector is connected to the permanent magnet assembly, the permanent magnet assembly is located on one side of the stator assembly, an air inlet and an air outlet are arranged on the outer shell, a first gap is provided between the radial bearing and the connector, a second gap is provided between the stator assembly and the permanent magnet assembly, and high-pressure gas can pass through the air inlet, the first gap, the second gap and the air outlet in sequence.

[0006] Preferably, a first cooling channel and a second cooling channel are respectively provided on the outer shell located at the inner ring and the outer ring of the stator assembly, and the first cooling channel and the second cooling channel are respectively connected to the liquid inlet and the liquid outlet of the outer shell.

[0007] Preferably, the first cooling channel and the second cooling channel are both in plurality and distributed along the axial direction of the outer shell.

[0008] Preferably, the connector includes a cylindrical portion inserted into the radial bearing and a push plate portion arranged on the outer wall of the cylindrical portion, the push plate portion is located at one end of the outer shell away from the stator assembly, the side of the push plate portion close to the stator assembly abuts against the inner wall of the outer shell through a first thrust bearing, and the side of the push plate portion away from the stator assembly abuts against the primary seal through a second thrust bearing, a third gap is provided between the push plate portion and the first thrust bearing, a fourth gap is provided between the push plate portion and the second thrust bearing, and both the third gap and the fourth gap are connected to the air inlet, a first air hole is provided on the cylindrical portion on the side of the push plate portion away from the stator assembly, the fourth gap is connected to the interior of the cylindrical portion through the first air hole, and the third gap is connected to the first gap, a fifth gap is provided between the end of the permanent magnet assembly away from the stator assembly and the secondary seal, a second air hole is provided on the permanent magnet assembly, and the fifth gap is connected to the interior of the cylindrical portion through the second air hole.

[0009] Preferably, the number of the first air holes and the second air holes are both plural and are evenly arranged along the circumferential direction of the cylindrical portion and the permanent magnet assembly, respectively.

[0010] Preferably, the outer wall of the outer shell is cylindrical, and both ends of the outer shell are connected to the first volute and the second volute through a primary seal and a secondary seal respectively.

[0011] Preferably, a primary impeller is disposed at one end of the connector away from the permanent magnet assembly, and the primary impeller is disposed in the first volute.

[0012] Preferably, a secondary impeller is arranged at one end of the permanent magnet assembly away from the connector, and the secondary impeller is arranged in the second volute.

[0013] This application adopts the above technical solution, which has at least the following beneficial effects:

[0014] The axial flux motor direct-drive centrifugal air compressor includes an outer shell, a connector, a radial bearing, a permanent magnet assembly and a stator assembly. The outer shell has a mounting hole at the center. The connector is arranged in the mounting hole through a radial bearing. The stator assembly is arranged in a ring shape on the outer shell on the side of the mounting hole. The connector is connected to the permanent magnet assembly. The permanent magnet assembly is located on one side of the stator assembly. An air inlet and an air outlet are arranged on the outer shell. There is a first gap between the radial bearing and the connector. There is a second gap between the stator assembly and the permanent magnet assembly. High-pressure gas can pass through the air inlet, the first gap, the second gap and the air outlet in sequence. The high-pressure gas passes through the first gap to form a lubricating gas film with a certain load and rigidity. This air film floats the shaft in the bearing and plays a role in supporting the shaft to bear the load. The high-pressure gas cools the stator assembly and the permanent magnet assembly of the motor through the second gap, achieving a wind-cooled heat dissipation effect.

[0015] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic cross-sectional structure diagram of an axial flux motor direct-driven centrifugal air compressor provided by an embodiment of the utility model;

[0018] Figure 2 It is a schematic cross-sectional structural diagram of an outer shell and a stator assembly provided in an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the outer shell provided by the embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the connector provided by the embodiment of the utility model;

[0021] Figure 5 It is a partial cross-sectional structural schematic diagram of an axial flux motor provided by an embodiment of the utility model;

[0022] Figure 6 It is a schematic diagram of the overall structure of the axial flux motor direct-drive centrifugal air compressor provided by an embodiment of the utility model.

[0023] In the figure, 1 is the outer shell; 2 is the connector; 3 is the radial bearing; 4 is the permanent magnet assembly; 5 is the stator assembly; 6 is the liquid inlet; 7 is the air outlet; 8 is the first gap; 9 is the second gap; 10 is the first cooling channel; 11 is the second cooling channel; 12 is the cylindrical part; 13 is the push plate part; 14 is the first thrust bearing; 15 is the second thrust bearing; 16 is the primary seal; 17 is the third gap; 18 is the fourth gap; 19 is the first air hole; 20 is the secondary seal; 21 is the fifth gap; 22 is the second air hole; 23 is the first volute; 24 is the second volute; 25 is the primary impeller; 26 is the secondary impeller. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0025] The specific embodiment of the utility model provides an axial flux motor direct-driven centrifugal air compressor, combined with the attached Figure 1 - Attachment Figure 5 As shown, it mainly includes an outer shell 1, a connecting body 2, a radial bearing 3, a permanent magnet assembly 4 and a stator assembly 5.

[0026] The outer shell 1 is a cylindrical structure, and a mounting hole is provided at the center of the outer shell 1. The mounting hole is coaxial with the outer shell 1 and is a cylindrical hole.

[0027] The connecting body 2 is arranged in the mounting hole through the radial bearing 3;

[0028] An annular mounting groove with a C-shaped cross section is provided on one end of the outer shell 1 on the peripheral side of the mounting hole, and the stator assembly 5 is arranged in an annular shape in the mounting groove;

[0029] The connector 2 is connected to the permanent magnet assembly 1, and the permanent magnet assembly 4 is located on one side of the stator assembly 5;

[0030] An air inlet and an air outlet 7 are provided on the outer shell 1, a first gap 8 is provided between the radial bearing 3 and the connector 2, and a second gap 9 is provided between the stator assembly 5 and the permanent magnet assembly 4. High-pressure gas can sequentially pass through the air inlet, the first gap 8, the second gap 9 and the air outlet 7. The high-pressure gas passes through the first gap 8 to form a lubricating gas film with a certain load and rigidity. This gas film floats the shaft in the bearing and plays a role in supporting the shaft to bear the load. The radial bearing 3 forms a hydrostatic bearing. The high-pressure gas passes through the second gap 9 to cool the stator assembly and the permanent magnet assembly of the motor, achieving an air-cooling and heat dissipation effect.

[0031] In the specific embodiments of the present application, as shown in the attached Figure 2 and attached Figure 3 As shown, a first cooling channel 10 and a second cooling channel 11 are respectively arranged on the outer shell body 1 located at the inner ring and the outer ring of the stator assembly 5, the first cooling channel 10 and the second cooling channel 11 are respectively connected to the liquid inlet 6, and the first cooling channel 10 and the second cooling channel 11 are respectively connected to the liquid outlet, the second cooling channel 11 is connected to the first cooling channel 10, and the first cooling channel 10 is connected to the air outlet 7. The cooling liquid can enter from the liquid inlet 6, and then flow through the second cooling channel 11 and the first cooling channel 10, and finally be discharged through the liquid outlet. In the whole process, the cooling liquid cools the outer shell, thereby releasing the heat of the motor.

[0032] In some embodiments, both the first cooling channel 10 and the second cooling channel 11 can be designed to be multiple and distributed along the axial direction of the outer shell 1, one end of one second cooling channel 11 is connected to the liquid inlet 6, and the other end thereof is connected to the remaining second cooling channels 11 through an annular channel, so that the cooling liquid can be distributed to all other second cooling channels 11 through this second cooling channel 11, and the second cooling channel 11 is then connected to the liquid outlet. At this time, the first cooling channel 10 is indirectly connected to the liquid outlet through the second cooling channel 11.

[0033] It should be noted that the liquid outlet is not shown in the figure, and the liquid outlet can be set on the outer shell 1.

[0034] In some embodiments, as shown in the attached Figure 4 and attached Figure 5 As shown, the connecting body 2 includes a cylindrical portion 12 inserted into the radial bearing 3 and a push plate portion 13 disposed on the outer wall of the cylindrical portion 12, and the push plate portion 13 is located at one end of the outer shell 1 away from the stator assembly 5;

[0035] The side of the push plate portion 13 close to the stator assembly 5 abuts against the inner wall of the outer shell 1 through the first thrust bearing 14, and the side of the push plate portion 13 away from the stator assembly 5 abuts against the primary seal 16 through the second thrust bearing 15;

[0036] A third gap 17 is provided between the push plate portion 13 and the first thrust bearing 14, and a fourth gap 18 is provided between the push plate portion 13 and the second thrust bearing 15. The third gap 17 and the fourth gap 18 are both connected to the air inlet. The air inlet is not shown in the drawings. The air inlet can be provided on the side wall of the outer shell 1 and close to the static pressure thrust bearing, so that when the high-pressure gas enters the air inlet, it can be diverted to the third gap 17 and the fourth gap 18;

[0037] The cylindrical portion 12 of the present application is provided with a first air hole 19 on the side of the push plate portion 13 away from the stator assembly 5, and the fourth gap 18 is connected to the interior of the cylindrical portion 12 through the first air hole 19, so that the fourth gap 18 can be entered into the interior of the cylindrical portion 12 through the first air hole 19;

[0038] The third gap 17 is connected to the first gap 8, and the high-pressure gas passing through the third gap 17 can flow through the first gap 8, and then be discharged through the second gap 9 and the gas outlet 7 after passing through the first gap 8;

[0039] As attached Figure 1 As shown in , there is a fifth gap 21 between one end of the permanent magnet assembly 4 away from the stator assembly 5 and the secondary seal 20;

[0040] A second air hole 22 is provided on the permanent magnet assembly 4, and the fifth gap 21 and the interior of the cylindrical portion 12 are connected through the second air hole 22, so that the high-pressure gas entering the interior of the cylindrical portion 12 can flow into the fifth gap 21 through the second air hole 22, and then be discharged from the outlet 7 after passing through the fifth gap 21.

[0041] In a specific embodiment of the present application, the number of the first air holes 19 and the second air holes 22 can be designed to be multiple and evenly arranged along the circumferential direction of the cylindrical portion 12 and the permanent magnet assembly 4, respectively, so that the gas can flow evenly in the circumferential direction.

[0042] In some embodiments, the combination Figure 1 and attached Figure 3 As shown, the outer wall of the outer shell 1 is cylindrical, and the two ends of the outer shell 1 are connected to the first volute 23 and the second volute 24 through the primary seal 16 and the secondary seal 20 respectively.

[0043] A primary impeller 25 is disposed on one end of the connector 2 away from the permanent magnet assembly 4 , and the primary impeller 25 is disposed in the first volute 23 .

[0044] A secondary impeller 26 is disposed at one end of the permanent magnet assembly 4 away from the connecting body 2 , and the secondary impeller 26 is disposed in the second volute 24 .

[0045] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", "some examples", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0046] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An axial flux motor direct-drive centrifugal air compressor, characterized in that: The invention comprises an outer shell, a connector, a radial bearing, a permanent magnet assembly and a stator assembly. The outer shell has a mounting hole at its center. The connector is arranged in the mounting hole through the radial bearing. The stator assembly is arranged in a ring shape on the outer shell around the mounting hole. The connector is connected to the permanent magnet assembly. The permanent magnet assembly is located on one side of the stator assembly. An air inlet and an air outlet are arranged on the outer shell. A first gap is provided between the radial bearing and the connector. A second gap is provided between the stator assembly and the permanent magnet assembly. High-pressure gas can pass through the air inlet, the first gap, the second gap and the air outlet in sequence.

2. The axial flux motor direct-drive centrifugal air compressor according to claim 1, characterized in that: A first cooling channel and a second cooling channel are respectively arranged on the outer shell located at the inner ring and the outer ring of the stator assembly, and the first cooling channel and the second cooling channel are respectively connected to the liquid inlet and the liquid outlet of the outer shell.

3. The axial flux motor direct-drive centrifugal air compressor according to claim 2, characterized in that: There are multiple first cooling channels and multiple second cooling channels, which are distributed along the axis direction of the outer shell.

4. The axial flux motor direct-drive centrifugal air compressor according to claim 1, characterized in that: The connector includes a cylindrical portion inserted into the radial bearing and a push plate portion arranged on the outer wall of the cylindrical portion, the push plate portion is located at one end of the outer shell away from the stator assembly, the side of the push plate portion close to the stator assembly abuts against the inner wall of the outer shell through a first thrust bearing, and the side of the push plate portion away from the stator assembly abuts against the primary seal through a second thrust bearing, a third gap is provided between the push plate portion and the first thrust bearing, a fourth gap is provided between the push plate portion and the second thrust bearing, and both the third gap and the fourth gap are communicated with the air inlet, a first air hole is provided on the cylindrical portion on the side of the push plate portion away from the stator assembly, the fourth gap is communicated with the interior of the cylindrical portion through the first air hole, and the third gap is communicated with the first gap, a fifth gap is provided between the end of the permanent magnet assembly away from the stator assembly and the secondary seal, a second air hole is provided on the permanent magnet assembly, and the fifth gap is communicated with the interior of the cylindrical portion through the second air hole.

5. The axial flux motor direct-drive centrifugal air compressor according to claim 4, characterized in that: The number of the first air holes and the second air holes are both multiple and are evenly arranged along the circumferential direction of the cylindrical portion and the permanent magnet assembly respectively.

6. The axial flux motor direct-drive centrifugal air compressor according to claim 1, characterized in that: The outer wall of the outer shell is cylindrical, and two ends of the outer shell are connected to the first volute and the second volute through a primary seal and a secondary seal respectively.

7. The axial flux motor direct-drive centrifugal air compressor according to claim 6, characterized in that: A primary impeller is arranged at one end of the connector away from the permanent magnet assembly, and the primary impeller is arranged in the first volute.

8. The axial flux motor direct-drive centrifugal air compressor according to claim 6, characterized in that: A secondary impeller is arranged at one end of the permanent magnet assembly away from the connecting body, and the secondary impeller is arranged in the second volute.

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