CN220915052U

CN220915052U - Air compressor

Info

Publication number: CN220915052U
Application number: CN202322051728.4U
Authority: CN
Inventors: 李清林; 张学锋; 赵凡; 钟明桥; 肖翔
Original assignee: Shijia Toubo Chengdu Technology Co ltd
Current assignee: Shijia Toubo Chengdu Technology Co ltd
Priority date: 2023-07-31
Filing date: 2023-07-31
Publication date: 2024-05-07
Anticipated expiration: 2033-07-31

Abstract

The utility model discloses an air compressor, which comprises an axis, a motor component and a compression component, wherein the motor component comprises a shell, a stator, a rotating shaft and a ring magnet, the stator is arranged in the shell, the stator is provided with a mounting cavity penetrating through the stator along the extending direction of the axis, the rotating shaft extends along the extending direction of the axis, at least part of the rotating shaft is rotatably arranged in the mounting cavity, the outer peripheral surface of the rotating shaft and the inner peripheral surface of the stator are arranged at intervals along the radial direction of the axis, the ring magnet is sleeved on the rotating shaft and is positioned in the mounting cavity, the outer peripheral surface of the ring magnet and the inner peripheral surface of the stator are arranged at intervals along the radial direction of the axis, so that the stator is matched with the ring magnet to enable the rotating shaft to rotate in the shell, and the compression component is arranged on one side of the motor component and is connected with the rotating shaft, so that the rotating shaft drives the compression component to compress air. The air compressor has the advantages of simple structure, low cost and the like.

Description

Air compressor

Technical Field

The utility model relates to the field of engineering machinery, in particular to an air compressor.

Background

According to the development of modern turbomachinery, an air bearing and an electromagnetic bearing are put into use, the turbomachinery has the precondition that high rotating speed can be achieved, and the efficiency requirement of a user is improved.

In the related art, the motor of the turbine machine is unreasonable in arrangement and low in efficiency.

Disclosure of utility model

The present utility model has been made based on the findings and knowledge of the inventors regarding the following facts and problems:

In the related art, the air bearing, especially the bearing, has the characteristics of light load and high rotating speed, so that the air bearing has high requirements on the weight of the rotor of the motor, the size of the rotor of the motor is limited, and the motor efficiency of the turbomachine is low.

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides the air compressor with small structural size and high rotating speed.

The air compressor according to the embodiment of the utility model comprises: an axis; the motor assembly comprises a shell, a stator, a rotating shaft and a ring magnet, wherein the stator is arranged in the shell, the stator is provided with a mounting cavity penetrating through the stator along the extending direction of the axis, the rotating shaft extends along the extending direction of the axis, at least part of the rotating shaft is rotatably arranged in the mounting cavity, the outer peripheral surface of the rotating shaft and the inner peripheral surface of the stator are arranged at intervals along the radial direction of the axis, the ring magnet is sleeved on the rotating shaft and is positioned in the mounting cavity, and the outer peripheral surface of the ring magnet and the inner peripheral surface of the stator are arranged at intervals along the radial direction of the axis, so that the stator is matched with the ring magnet to enable the rotating shaft to rotate in the shell; the compression assembly is provided with a compression cavity, an air inlet and an air outlet, the air inlet and the air outlet are communicated with the compression cavity, and the compression assembly is arranged on one side of the motor assembly and is connected with the rotating shaft, so that the rotating shaft drives the compression assembly to compress gas.

According to the air compressor provided by the embodiment of the utility model, the annular magnet is arranged as the rotor, and the magnet sheath does not need to be arranged outside the annular magnet, so that the eddy current loss of the magnet sheath is reduced, the efficiency of a motor component of the air compressor is improved, and the performance of the motor component of the air compressor is ensured.

In some embodiments, the motor assembly further comprises a first gas suspension bearing and a second gas suspension bearing, the first gas suspension bearing and the second gas suspension bearing are both arranged in the housing, the first gas suspension bearing and the second gas suspension bearing are both sleeved on the rotating shaft and are arranged at intervals along the circumference of the rotating shaft, so that the first gas suspension bearing and the second gas suspension bearing cooperate to limit the swinging of the rotating shaft in the radial direction of the axis, and the ring magnet is arranged between the first gas suspension bearing and the second gas suspension bearing.

In some embodiments, the motor assembly further comprises a thrust bearing disposed within the housing and disposed through the shaft, the thrust bearing being located on a side of the first gas suspension bearing remote from the second gas suspension bearing such that the thrust bearing supports the shaft to limit the shaft from swinging in the direction of extension of the axis.

In some embodiments, the ring magnet has a circular shape in projection as seen in the direction of extension of the axis, the ring magnet having an outer diameter of less than 20mm, and the ring magnet having an axial dimension of 14mm-18mm.

In some embodiments, the stator has a circular ring shape in projection as seen in the direction of extension of the axis, an outer diameter of 42mm-46mm, and an axial dimension of 13mm-17mm.

In some embodiments, the dimension of the stator in the direction of extension of the axis is smaller than the dimension of the ring magnet in the direction of extension of the axis, and the spacing between the inner diameter of the stator and the outer diameter of the ring magnet in the radial direction of the axis is 2mm-4mm.

In some embodiments, the housing comprises a shell and a first end cover, the shell comprises a sleeve and an end face, the sleeve extends along the extending direction of the axis, the end face is arranged at one end of the sleeve, the first end cover is arranged at the other end of the sleeve, the rotating shaft, the stator and the ring magnet are all arranged in the first end cover, the end face of the shell is provided with an end face first hole penetrating through the shell along the extending direction of the axis, and one end of the rotating shaft extends out of the shell through the first hole.

In some embodiments, the housing further comprises a second end cap disposed at an end of the first end cap remote from the housing, the first end cap is provided with a second hole penetrating through the first end cap along the extending direction of the axis, and the other end of the rotating shaft extends out of the second hole and abuts against the second end cap.

In some embodiments, the compression assembly comprises: the volute is arranged on one side of the motor assembly; the impeller is rotatably arranged in the volute and is connected with the rotating shaft of the motor assembly, so that the motor assembly drives the volute to rotate.

In some embodiments, the air compressor further comprises a bearing sleeve, the bearing sleeve extends along the extending direction of the axis, the rotating shaft, the annular magnet, the first gas suspension bearing and the second gas suspension bearing are all installed in the bearing sleeve, the outer peripheral surface of the annular magnet and the inner peripheral surface of the bearing sleeve are arranged at intervals, and the stator sleeve is arranged on the outer peripheral surface of the bearing sleeve.

Drawings

Fig. 1 is a front view of an air compressor according to an embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of an air compressor according to an embodiment of the present utility model.

Fig. 3 is a front third order mode shape and strain energy profile of a rotor assembly of an air compressor according to an embodiment of the present utility model.

FIG. 4 is a graph showing a first order mode shape and strain energy distribution of a rotor assembly of an air compressor according to an embodiment of the present utility model

FIG. 5 is a second order mode shape and strain energy distribution diagram of a rotor assembly of an air compressor according to an embodiment of the utility model

FIG. 6 is a third order mode shape and strain energy distribution diagram of a rotor assembly of an air compressor according to an embodiment of the present utility model

Fig. 7 is a stress distribution diagram of a rotor assembly and a shaft of an air compressor according to an embodiment of the present utility model under rotation.

Fig. 8 is a stress distribution diagram of a rotor assembly and a shaft of an air compressor according to an embodiment of the present utility model under rotation.

An air compressor 100;

An axis 1;

A motor 2; a housing 21; a housing 211; a first end cap 212; a second end cap 213; a stator 22; a rotation shaft 23; a rotor 24; a first gas suspension bearing 25; a second gas suspension bearing 26; a thrust bearing 27;

an impeller 3; a volute 4; and a bearing sleeve 5.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

An air compressor according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1-2, the air compressor according to the embodiment of the present utility model includes a motor assembly 2, a scroll 4, and an impeller 3.

The motor assembly 2 includes a housing 21, a stator 22, a rotating shaft 23, and a ring magnet 24.

The stator 22 is provided in the housing 21, and the stator 22 has an installation cavity penetrating the stator 22 in a longitudinal direction of the housing 21 (a left-right direction as viewed in fig. 1). Specifically, as shown in fig. 1-2, the stator 22 is fixedly installed in the housing 21, and the stator 22 has an installation cavity penetrating the stator 22 in the left-right direction.

At least part of the rotating shaft 23 is rotatably provided in the mounting chamber and an outer peripheral surface of the rotating shaft 23 and an inner peripheral surface of the stator 22 are disposed at intervals in a radial direction of the axis 1. The ring magnet is sleeved on the rotating shaft 23 and is positioned in the mounting cavity, and the outer peripheral surface of the ring magnet and the inner peripheral surface of the stator 22 are arranged at intervals along the radial direction of the axis 1, so that the stator 22 is matched with the ring magnet 24 to enable the rotating shaft 23 to rotate in the shell 21. Specifically, as shown in fig. 1-2, the middle part of the rotating shaft 23 is rotatably arranged in the installation cavity in a penetrating manner, the outer peripheral surface of the rotating shaft 23 and the inner peripheral surface of the stator 22 are arranged at intervals, two ends of the rotating shaft 23 extend out of the installation cavity, the annular magnet 24 is arranged in the installation cavity and sleeved on the outer peripheral surface of the middle part of the rotating shaft 23, the outer peripheral surface of the annular magnet 24 and the inner peripheral surface of the stator 22 are arranged at intervals along the radial direction of the axis 1, the annular magnet 24 is an annular magnet made of a magnet and is fixedly arranged on the outer peripheral surface of the rotating shaft 23 (for example, adhesion), and the outer peripheral surface of the annular magnet 24 and the inner peripheral surface of the stator 22 are arranged at intervals, so that when the stator 22 is electrified, a magnetic field can be generated to drive the annular magnet to rotate in the installation cavity, and then drive the rotating shaft 23 to rotate.

The compression assembly is provided with a compression cavity, an air inlet and an air outlet, the air inlet and the air outlet are communicated with the compression cavity, and the compression assembly is arranged on one side of the motor assembly and is connected with the rotating shaft, so that the rotating shaft drives the compression assembly to compress gas. Specifically, as shown in fig. 1, the compression assembly includes a scroll 4 and an impeller 3, the scroll 4 has a compression chamber, an air inlet and an air outlet, the scroll 4 is provided at one side of the motor assembly 2, and the impeller 3 is rotatably provided in the scroll 4 and connected to a rotation shaft 23 of the motor assembly 2, so that the motor assembly 2 drives the scroll 4 to rotate. Specifically, as shown in fig. 1-2, the spiral case 4 is provided at the right end of the housing 21 by a fastener, the impeller 3 is rotatably installed in the spiral case 4, and the outer circumferential surface of the impeller 3 is spaced from the inner circumferential surface of the spiral case 4, and the right end of the rotating shaft 23 is installed on the impeller 3, so that the impeller 3 is driven to rotate by the rotating shaft 23.

According to the motor assembly 2 provided by the embodiment of the utility model, the annular magnet is arranged as the annular magnet 24, a magnet sheath is not required to be arranged outside the annular magnet, so that the eddy current loss of the magnet sheath is reduced, the efficiency of the motor assembly 2 is improved, the performance of the motor assembly 2 is ensured, in addition, the space occupied by the magnet sheath in the installation cavity is also avoided, the size of the annular magnet 24 in the radial direction of the axis 1 is reduced, the weight of the rotating shaft 23, the outer diameter of the rotating shaft 23 and the number of machined parts of the annular magnet 24 are reduced, the application of a gas suspension bearing is met, the outer diameter of the annular magnet 24 is reduced, and the whole size of the motor assembly 2 can be ensured to be reduced while the normal air compressor 100 is ensured.

In some embodiments, the motor assembly 2 further includes a first gas suspension bearing 25 and a second gas suspension bearing 26, the first gas suspension bearing 25 and the second gas suspension bearing 26 are disposed in the housing 21, the first gas suspension bearing 25 and the second gas suspension bearing 26 are disposed on the rotating shaft 23 and are disposed at intervals along the circumferential direction of the rotating shaft 23, so that the first gas suspension bearing 25 and the second gas suspension bearing 26 cooperate to limit the swing of the rotating shaft 23 in the radial direction of the axis 1, and the ring magnet 24 is disposed between the first gas suspension bearing 25 and the second gas suspension bearing 26. Specifically, as shown in fig. 1-2, a first gas suspension bearing 25 and a second gas suspension bearing 26 are provided to pass through the rotary shaft 23 with the ring magnet 24 between the first gas suspension bearing 25 and the second gas suspension bearing 26, whereby the first gas suspension bearing 25 and the second gas suspension bearing 26 constrain the ring magnet 24 in the radial direction of the axis 1 such that the rotary shaft 23 is supported in the housing 21 by the first gas suspension bearing 25 and the second gas suspension bearing 26.

In some embodiments, the motor assembly 2 further comprises a thrust bearing 27, the thrust bearing 27 being provided within the housing 21 and penetrating the shaft 23, the thrust bearing 27 being located on a side of the first gas suspension bearing 25 remote from the second gas suspension bearing 26, such that the thrust bearing supports the shaft 23 to limit the shaft 23 from swinging in the direction of extension of the axis 1. Specifically, as shown in fig. 1-2, a thrust bearing 27 is provided penetrating the left end portion of the rotating shaft 23 and provided inside the housing 21, so that the load of the rotating shaft 23 in the axial direction is received by the thrust bearing 27.

In some embodiments, the projection of the ring magnet 24 is circular, as seen in the extension direction of the axis 1 (left-right direction as viewed in fig. 1), the outer diameter of the ring magnet 24 is less than 20mm, and the ring magnet 24 has an axial dimension of 24mm-18mm. Specifically, as shown in fig. 1-2, the outer circumferential contour of the ring magnet 24 is a circular sleeve, the outer diameter of the ring magnet 24 may be any one of 24mm, 25mm, 26mm, 27mm, 18mm, 19mm, 20mm, etc., and when the outer diameter of the ring magnet is larger than 20mm, the ring magnet 24 will be oversized, thereby causing the motor assembly 2 to be oversized in the radial direction of the axis 1, the ring magnet 24 will be any one of 24mm, 25mm, 26mm, 27mm, 18mm, etc., and when the size of the ring magnet 24 is smaller than 24mm, the size of the ring magnet 24 will be undersized, thereby affecting the power of the motor assembly 2, and when the size of the ring magnet is larger than 18mm, the ring magnet 24 will be oversized, thereby causing the motor assembly 2 to be oversized.

Preferably, the ring magnet 24 has an outer diameter of 24mm and a length in the lateral direction of 26mm.

In some embodiments, the stator 22 is projected in a circular ring shape, as seen in the extension direction of the axis 1 (left-right direction as viewed in fig. 1), the outer diameter of the stator 22 is 42mm-46mm, and the axial dimension of the stator 22 is 23mm-27mm. Specifically, as shown in fig. 1-2, the outer circumferential contour of the stator 22 is circular, the outer diameter of the stator 22 may be any one of 42mm, 43mm, 44mm, 45mm, 46mm, and when the outer diameter of the stator 22 is smaller than 42mm, the manufacturing cost of the stator 22 will be increased, and when the outer diameter of the stator 22 is larger than 46mm, the motor assembly 2 will be oversized, and when the size of the stator 22 in the left-right direction is any one of 23mm, 24mm, 25mm, 26mm, 27mm, the size of the ring magnet 24 in the left-right direction is smaller than 23mm, the size of the ring magnet will be undersized, thereby affecting the power of the motor assembly 2, and when the size of the ring magnet 24 in the left-right direction is larger than 27mm, the size of the ring magnet 24 will be oversized, thereby the size of the motor assembly 2 will be oversized.

In some embodiments, the dimension of the stator 22 in the direction of extension of the axis 1 is smaller than the dimension of the ring magnet 24 in the direction of extension of the axis 1. In particular, as shown in fig. 1-2, the stator 22 has a smaller dimension in the left-right direction than the ring magnet 24, thereby facilitating the complete positioning of the stator 22 within the ring magnet during assembly, reducing assembly difficulty and ensuring the power of the motor assembly 2.

In some embodiments, the housing 21 includes a first shell 211 and a first end cap 222, the first shell 211 includes a sleeve extending along the extending direction of the axis 1 and an end face, the end face is provided at one end of the sleeve, the first end cap 222 is provided at the other end of the sleeve, the rotating shaft 23, the stator 22 and the ring magnet 24 are all provided in the first end cap 222, the end face of the first shell 211 is provided with an end face first hole penetrating the first shell 211 along the extending direction of the axis 1, and one end of the rotating shaft 23 protrudes out of the first shell 211 through the first hole.

Specifically, as shown in fig. 1-2, the first housing 211 includes a sleeve extending in a left-right direction and an end surface, the end surface is provided at a right end of the sleeve, the first end cover 222 is provided at a left end of the first end cover 222 by fasteners, a middle part of the rotating shaft 23, the stator 22, the ring magnet 24, the first gas suspension bearing 25, and the second gas suspension bearing 26 are all provided in the sleeve, when the motor assembly 2 is installed, the rotating shaft 23, the stator 22, the ring magnet 24, the first gas suspension bearing 25, and the second gas suspension bearing 26 may be installed in the sleeve in advance, and then the first end cover 222 is installed at a left upper part of the sleeve, thereby reducing an assembly cost of the motor assembly 2, the end surface of the first housing 211 is provided with a first hole penetrating in the left-right direction, and the right end of the rotating shaft 23 may be connected to the impeller 3 by penetrating the first hole, thereby rotating the impeller 3.

In some embodiments, the housing 21 further includes a second end cover 223, the second end cover 223 is disposed at an end of the first end cover 222 away from the first shell 211, the first end cover 222 is provided with a second hole penetrating the first end cover 222 along the extending direction of the axis 1, and the other end of the rotating shaft 23 extends out of the second hole and abuts against the second end cover 223. Specifically, as shown in fig. 1-2, the second end cover 223 is provided at the left end of the first end cover 222, the first end cover 222 is provided with a second hole penetrating the first end cover 222 in the left-right direction, the first hole and the second hole are disposed opposite to each other at intervals in the left-right direction, the left end of the rotating shaft 23 penetrates the second hole and is provided with the thrust bearing 27, the second end cover 223 is mounted at the left end of the first end cover 222 by a fastener, and the thrust bearing 27 is located between the second end cover 223 and the first end cover 222, so that the thrust bearing 27 provides a mounting basis.

In some embodiments, the impeller 3 includes a hub (not shown) and a plurality of blades (not shown) disposed on the hub and spaced circumferentially along the hub, the cross-sectional area of the hub gradually increasing in a direction away from the motor, and the hub is disposed on the shaft 23 of the motor assembly 2 so that the motor assembly 2 rotates the hub. Specifically, as shown in the figure, the cross-sectional area of the hub gradually decreases from left to right, a plurality of blades are arranged on the peripheral surface of the hub and are arranged at intervals along the circumferential direction of the hub, the right end of the rotating shaft 23 is connected with the hub, or the right end of the rotating shaft 23 is integrally formed with the hub, so that the rotating shaft 23 drives the hub to rotate, and gas flowing into the turbine is compressed.

In some embodiments, the air compressor 100 further includes a bearing housing 5, the bearing housing 5 extends along an extending direction of the axis, and the rotating shaft 23, the ring magnet 24, the first gas suspension bearing 25, and the second gas suspension bearing 26 are all installed in the bearing housing 5, and an outer circumferential surface of the ring magnet 24 and an inner circumferential surface of the bearing housing 5 are disposed at intervals, and the stator housing is disposed on the outer circumferential surface of the bearing housing 5. Thereby, a mounting basis is provided for the first gas suspension bearing 25, the second gas suspension bearing 26 by the bearing housing 5.

In some embodiments, the spacing between the inner diameter of the bearing housing 5 and the outer diameter of the ring magnet 24 in the radial direction of the axis 1 is 2mm-4mm. Specifically, as shown in fig. 1-2, the interval between the inner diameter of the bearing housing 5 and the outer diameter of the ring magnet 24 in the radial direction of the axis 1 is any one of 2mm, 3mm, 4mm, and when the interval is less than 2mm, it will cause difficulty in mounting the motor assembly 2 and high mounting cost, and when the interval is more than 4mm, it will cause an increase in the size of the motor assembly 2 in the radial direction of the axis 1.

It should be noted that, the motor 1 according to the embodiment of the present utility model does not modify the stator assembly 21, and is a common stator of a motor, and the embodiment of the present utility model is not specifically described.

As shown in fig. 3-8 below, and taking the air compressor 100 as an example, the unit of the air compressor 100 is generally as follows: the rotation speed of 50000RPM and the power of 100w are at the rotation speed, so that the rotating shaft 23 can normally run.

The extraction of the modal calculation results is based on two criteria:

First: since the ring magnet 24 is symmetrical in the radial direction (radial direction of the axis 1 as shown in fig. 2), the radial direction considered in the extraction mode can characterize the dynamics of the ring magnet, and the mode in the other symmetrical direction can be ignored.

Second,: modality extraction generally considers forward motion modalities. During the starting process, the ring magnet 24 considers a single excitation frequency, i.e. there is a certain imbalance, the excitation frequency is the rotation frequency fn, and other conditions such as rotor-stator friction, the influence of pneumatic cross-coupling stiffness and the like are not considered.

As can be seen from fig. 3 to 6, the first-order critical rotation speed 22540rpm, the vibration mode is the cone pendulum vibration mode, the first-order mode, the strain energy on the rotating shaft 23 is 0.27%; second-order critical rotation speed 26976pm, the vibration mode is translational vibration mode, second-order mode, strain energy on the rotating shaft 23 is 1.86%; the third-order critical rotation speed 93696rpm is the bending vibration mode of the right rotating shaft 23, the third-order mode is adopted, and the strain energy on the rotating shaft 23 is 97.93%.

Therefore, according to the Campbell diagram and the mode shape, the ring magnet does not resonate when normally operating at 50000rpm, and has safety margin, thereby meeting the long-term operation requirement.

In addition, as can be seen from fig. 7-8, the stress of the magnetic steel and the rotating shaft 23 does not exceed the allowable stress of the material as can be seen from the stress diagrams.

Therefore, the above calculation can determine that the ring magnet structure is effective in operation, meets the operation conditions, and can meet the following advantages: in order to ensure that the motor assembly 2 runs successfully, the scheme is designed into the inner annular magnet motor assembly 2, the inner annular magnet adopts an annular magnet, the outer ring of the annular magnet is not provided with a magnet sheath any more, and the magnet sheath is not provided, so that the eddy current loss of the magnet sheath is reduced, and the efficiency of the motor assembly 2 is improved. The performance of the motor assembly 2 is guaranteed, meanwhile, the sheath is not arranged, the space occupied by the sheath is saved, the weight of the rotating shaft 23 is reduced, the number of machining parts is also reduced, and the size of the outer diameter of the rotating shaft 23 is reduced. The application of the gas suspension bearing is convenient, and the reduction of the outer diameter of the annular magnet can ensure the reduction of the volume of the whole machine, thereby facilitating the development under the miniature high-speed motor component 2.

Finally, the wind friction formula of the motor assembly 2 is as follows:

P_w＝2πρLR⁴ω³/R_e

Wherein: p _W is the wind friction loss, ρ is the air density, ω is the annular magnet 24 angular velocity, R is the annular magnet 24 outer diameter, L is the annular magnet 24 length, and R _e is the reynolds number. From this, the larger R is, the smaller P _W is, and by providing the ring magnet, the wind friction loss can be reduced, and the efficiency of the motor assembly 2 can be improved.

In summary, in the air compressor 100 according to the embodiment of the present utility model, the ring magnet 24 is in the form of a ring magnet, and no magnet sheath is required, so that the radial dimension and weight of the rotating shaft 23 can be reduced under the condition of improving the efficiency and the rotating speed of the motor assembly 2, and the installation requirement of the gas suspension bearing can be satisfied.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims

1. An air compressor, comprising: an axis; the motor assembly comprises a shell, a stator, a rotating shaft and a ring magnet, wherein the stator is arranged in the shell, the stator is provided with a mounting cavity penetrating through the stator along the extending direction of the axis, the rotating shaft extends along the extending direction of the axis, at least part of the rotating shaft is rotatably arranged in the mounting cavity, the outer peripheral surface of the rotating shaft and the inner peripheral surface of the stator are arranged at intervals along the radial direction of the axis, the ring magnet is sleeved on the rotating shaft and is positioned in the mounting cavity, and the outer peripheral surface of the ring magnet and the inner peripheral surface of the stator are arranged at intervals along the radial direction of the axis, so that the stator is matched with the ring magnet to enable the rotating shaft to rotate in the shell; the compression assembly is provided with a compression cavity, an air inlet and an air outlet, the air inlet and the air outlet are communicated with the compression cavity, and the compression assembly is arranged on one side of the motor assembly and is connected with the rotating shaft, so that the rotating shaft drives the compression assembly to compress gas.

2. The air compressor of claim 1, further comprising a first gas suspension bearing and a second gas suspension bearing, the first gas suspension bearing and the second gas suspension bearing are both disposed in the housing, the first gas suspension bearing and the second gas suspension bearing are both disposed on the rotating shaft in a sleeved manner and disposed at intervals along a circumferential direction of the rotating shaft, so that the first gas suspension bearing and the second gas suspension bearing cooperate to limit the swinging of the rotating shaft in a radial direction of the axis, and the ring magnet is disposed between the first gas suspension bearing and the second gas suspension bearing.

3. The air compressor of claim 2, further comprising a thrust bearing disposed within the housing and disposed through the shaft, the thrust bearing being located on a side of the first gas suspension bearing remote from the second gas suspension bearing such that the thrust bearing supports the shaft to limit the shaft from swinging in the direction of extension of the axis.

4. An air compressor according to claim 1, wherein the ring magnet has a circular ring shape in projection as seen in the direction of extension of the axis, the ring magnet having an outer diameter of less than 20mm, and the ring magnet having an axial dimension of 14mm-18mm.

5. The air compressor as claimed in claim 1, wherein the stator has a circular ring shape in projection as seen in the extending direction of the axis, an outer diameter of the stator is 42mm-46mm, and an axial dimension of the stator is 13mm-17mm.

6. The air compressor of claim 1, wherein a dimension of the stator in an extending direction of the axis is smaller than a dimension of the ring magnet in an extending direction of the axis, and a space between an inner diameter of the stator and an outer diameter of the ring magnet in a radial direction of the axis is 2mm to 4mm.

7. The air compressor of claim 1, wherein the housing includes a shell and a first end cover, the shell includes a sleeve extending along an extending direction of the axis and an end face, the end face is provided at one end of the sleeve, the first end cover is provided at the other end of the sleeve, the rotating shaft, the stator and the ring magnet are all provided in the first end cover, the end face of the shell is provided with an end face first hole penetrating through the shell along the extending direction of the axis, and one end of the rotating shaft extends out of the shell through the first hole.

8. The air compressor of claim 7, wherein the housing further includes a second end cap disposed at an end of the first end cap remote from the housing, the first end cap having a second hole penetrating the first end cap in an extending direction of the axis, and the other end of the rotating shaft extending beyond the second hole to abut against the second end cap.

9. The air compressor of claim 1, wherein the compression assembly comprises:

The volute is arranged on one side of the motor assembly;

The impeller is rotatably arranged in the volute and is connected with the rotating shaft of the motor assembly, so that the motor assembly drives the volute to rotate.

10. The air compressor of claim 2, further comprising a bearing housing extending along an extending direction of the axis, wherein the rotating shaft, the ring magnet, the first gas suspension bearing, and the second gas suspension bearing are all mounted in the bearing housing, an outer circumferential surface of the ring magnet and an inner circumferential surface of the bearing housing are disposed at intervals, and the stator housing is disposed on the outer circumferential surface of the bearing housing.