CN115030889A

CN115030889A - Air compressor

Info

Publication number: CN115030889A
Application number: CN202210764110.XA
Authority: CN
Inventors: 王乐鑫; 张学锋; 李清林; 代中燕; 王金龙
Original assignee: Xace Turbo Technologies Beijing Co ltd
Current assignee: Xace Turbo Technologies Beijing Co ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-09-09

Abstract

The invention discloses an air compressor, which comprises a first shell, a second shell and a compression assembly, wherein the first shell is provided with an air outlet, the second shell is arranged at one end, far away from the air outlet, of the first shell, one part of the second shell is arranged in the first shell in a penetrating manner, the second shell is provided with an air inlet communicated with the air outlet, the compression assembly is arranged in the first shell, one part of the compression assembly is positioned in the second shell so as to compress air in the second shell, and the second shell can move relative to the first shell along the length direction of the first shell so as to adjust a gap between the inner peripheral surface of the second shell and the outer peripheral surface of the compression assembly so as to adjust the flow and the pressure ratio of air flow of the air outlet. The air compressor has the advantages of simple structure, convenience in adjustment, low cost and the like.

Description

Air compressor

Technical Field

The invention relates to the technical field of air compressor manufacturing, in particular to an air compressor.

Background

An air compressor is a mechanical device for compressing gas, converts mechanical energy input by a motor or a fuel engine into gas pressure to provide gas source power, and is a core device of a pneumatic system.

In the correlation technique, the air current of the air-out end of the air compressor machine is inconvenient to adjust, and the service life is low.

Disclosure of Invention

The present invention is based on the discovery and recognition by the inventors of the following facts and problems:

in the related technology, the blower of the medical respirator needs to rapidly and accurately adjust the rotating speed along with the breathing and the inhalation of the patient, and outputs air or oxygen with corresponding parameters for the pressure and the flow which are instantaneously needed by the lung of the patient. However, the rapid acceleration and the rapid deceleration have the requirements of high frequency, high responsiveness and high accuracy on bearings, motors and controllers of the fan, and the alternating working condition provides high challenges on the reliability and the service life of the high-speed bearings, the output power and the heat dissipation of the motors and the high frequency and the responsiveness of the controllers.

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an embodiment of the present invention proposes one.

The air compressor of the embodiment of the invention comprises: a first housing having an air outlet; the second shell is arranged at one end, far away from the air outlet, of the first shell, one part of the second shell penetrates through the first shell, and the second shell is provided with an air inlet communicated with the air outlet; a compression assembly disposed within the first shell and a portion of the compression assembly located within the second shell to compress gas within the second shell, the second shell being movable relative to the first shell along a length direction of the first shell so as to adjust a gap between an inner circumferential surface of the second shell and an outer circumferential surface of the compression assembly to adjust a flow rate and a pressure ratio of the air flow of the outlet.

According to the air compressor provided by the embodiment of the invention, the first shell and the second shell are arranged, so that the gas state parameters of the air outlet end of the air compressor are dynamically adjusted, the circulating air requirements of customers with different breathing characteristics are met, the responsiveness requirements of the air compressor on the motor and the controller are reduced, the loss and system noise of the motor and the controller under variable working conditions are reduced, the service life of the air compressor is prolonged, and the individualized use experience of the respirator is further provided.

In some embodiments, the air compressor further comprises: the mounting piece is arranged on the second shell, and a threaded through hole extending along the length direction of the first shell is formed in the mounting piece; the driving piece, the outer peripheral face of driving piece be equipped with screw thread that the screw thread through-hole cooperateed, the driving piece rotationally wears to establish in the screw thread through-hole, so that the driving piece drive the installed part moves along the length direction of first shell.

In some embodiments, the air compressor further includes a first motor, the first motor is disposed on the first casing, the first motor and the mounting member are disposed opposite to each other at an interval along the length direction of the first casing, and an end of the driving member away from the mounting member is connected to the first motor so as to drive the driving member to rotate.

In some embodiments, a side of the first shell facing the second shell is provided with a first sliding surface, and a side of the second shell facing the first shell is provided with a second sliding surface cooperating with the first sliding surface.

In some embodiments, the air compressor further comprises a sealing member disposed on a side of the first sliding surface facing the second sliding surface, and/or the sealing member is disposed on a side of the second sliding surface facing the first sliding surface.

In some embodiments, the air compressor further comprises: the first impeller is rotatably arranged in the second shell; the second motor is arranged in the first shell, the outer peripheral surface of the second motor and the inner peripheral surface of the first shell are arranged at intervals to form an airflow channel, two ends of the airflow channel are respectively communicated with the air inlet and the air outlet, and the second motor is connected with the first impeller so as to drive the first impeller to rotate.

In some embodiments, the air compressor further includes an adjusting assembly in communication with at least one of the second casing and the air flow passage, the adjusting assembly being configured to discharge a portion of the compressed air so as to adjust a flow rate and a pressure ratio of the compressed air at the outlet end.

In some embodiments, the regulating assembly is communicated with the air inlet end and is positioned on one side of the first impeller far away from the second motor, so that the compressed air discharged through the regulating assembly flows into the first shell.

In some embodiments, the air compressor further comprises: a volute including a chamber communicating with the airflow passage, a first flow passage communicating with the chamber and surrounding an outer circumferential side of the chamber, and a second flow passage communicating with the chamber and surrounding an outer circumferential side of the chamber, the outlet being formed on the first flow passage; the second impeller and the turbine are both rotatably arranged in the volute, the second impeller is connected with the turbine so that the turbine can drive the second impeller to rotate, the second impeller and the first flow channel are oppositely arranged at intervals in the inner and outer directions so that high-pressure gas is discharged through the first flow channel after being pressurized by the second impeller, and the turbine and the second flow channel are arranged at intervals in the inner and outer directions so that the turbine is driven to rotate by the gas in the second flow channel.

In some embodiments, the modulation assembly is in communication with the second flow passage such that compressed gas flows into the second flow passage to drive the turbine to rotate.

Drawings

Fig. 1 is a schematic structural view of an air compressor according to a first embodiment of the present invention.

Fig. 2 is a schematic structural view of an air compressor according to a second embodiment of the present invention.

Fig. 3 is a schematic structural view illustrating the movement of the second casing of the air compressor in accordance with the second embodiment of the present invention.

Fig. 4 is a schematic structural view of an air compressor according to a third embodiment of the present invention.

Reference numerals:

an air compressor 100;

a first case 1; an air outlet 11; an air flow passage 111; a second shell 2; an air inlet 21; a first channel 22; a second channel 23;

a compression assembly 3; the first impeller 31; a second motor 32;

a second impeller 4; a turbine 5; a volute 6; a chamber 61; a first flow passage 62; the second flow path 63; a first motor 7; a mounting member 8; a drive member 9; an adjustment assembly 10; a valve 101; a valve controller 102.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

An air compressor 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the compressor according to the embodiment of the present invention includes a first shell 1, a second shell 2, and a compression assembly 3.

The first shell 1 is provided with an air outlet 11, the second shell 2 is arranged at one end of the first shell 1 far away from the air outlet 11, a part of the second shell 2 penetrates through the first shell 1, and the second shell 2 is provided with an air inlet 21 communicated with the air outlet 11. Specifically, as shown in fig. 1 to 4, the first casing 1 is disposed on the left side of the second casing 2, the left end of the second casing 2 penetrates the right end of the first casing 1, the left end of the first casing 1 is provided with an air outlet 11, the right end of the second casing 2 is provided with an air inlet 21, and the air inlet 21 is communicated with the air outlet 11, so that air flows into the first casing 1 from the air inlet 21 and is compressed in the first casing 1, and is discharged through the air outlet 11 of the second casing 2.

The compressing assembly 3 is provided in the first casing 1 and a portion of the compressing assembly 3 is located in the second casing 2 to compress the gas in the second casing 2, and the second casing 2 is movable relative to the first casing 1 in a length direction (left and right directions as shown in fig. 1) of the first casing 1 so as to adjust a gap between an inner circumferential surface of the second casing 2 and an outer circumferential surface of the compressing assembly 3 to adjust a flow rate and a pressure ratio of the gas flow of the outlet port 11. Specifically, as shown in fig. 1 to 4, the compression assembly 3 includes a first impeller 31 and a second motor 32, the first impeller 31 is rotatably disposed in the second casing 2, a part of the second motor 32 is disposed in the first casing 1, another part of the second motor 32 is disposed in the second casing 2, and the second motor 32 is connected to the first impeller 31, so as to drive the first impeller 31 to rotate in the second casing 2, so that the airflow is compressed in the second casing 2, the position of the second casing 2 is moved left and right, and a gap between an inner circumferential surface of the second casing 2 and the first impeller 31 is adjusted, so that leakage loss between blade tips of the first impeller 31 is increased, the pneumatic efficiency of the air compressor 100 is reduced, the flow rate and the pressure ratio of the airflow at the air outlet 11 are increased, when a high pressure rise flow rate is not required, the rotation speed of the motor is not adjusted, and the pneumatic parameters are adjusted by reducing the pneumatic efficiency. In other words, the reciprocating change of the rotating speed of the rotor of the air compressor 100 is replaced by the reciprocating movement change of the second shell 2, so that the response requirement of the air compressor 100 on the second motor 32 and the controller is reduced, and the loss of the second motor 32 and the controller and the system noise under the variable working condition are reduced.

According to the air compressor 100 provided by the embodiment of the invention, the first shell 1 and the second shell 2 are arranged, so that after the rotating speed of the air compressor 100 reaches a constant rotating speed after being started, the second shell 2 is controlled to slide along the left-right direction, and the blade front gap of the first impeller 31 is adjusted, so that the pneumatic efficiency, the flow rate and the pressure ratio in the first shell 1 and the second shell 2 are adjusted, the flow rate and the pressure ratio of airflow at the air outlet 11 are adjusted, the loss of a bearing, a second motor 32 and a controller under the variable-speed operation is reduced, the requirements on the frequency, the responsiveness and the accuracy of the bearing, the second motor 32 and the controller are reduced, and the service life of the air compressor 100 is prolonged.

In some embodiments, air compressor 100 further includes a mounting member 8 and a driving member 9.

The mounting member 8 is provided on the second housing 2, and the mounting member 8 is provided with a screw through hole extending in the length direction of the first housing 1. Specifically, as shown in fig. 1 to 4, the mounting member 8 may be a mounting plate or a mounting block and is fixed to the second housing 2, the second housing 2 moves in the left-right direction along with the mounting member 8, and the mounting member 8 is provided with a threaded through hole penetrating the mounting member 8 in the left-right direction.

The outer peripheral surface of driving piece 9 is equipped with the screw thread with screw thread through-hole complex, and driving piece 9 is rotationally worn to establish in the screw thread through-hole to driving piece 9 drives installed part 8 and removes along the length direction of first shell 1. Specifically, as shown in fig. 1 to 4, the driving member 9 may be a threaded rod, the threaded rod is inserted into the threaded through hole, and the mounting member 8 is driven to move in the left-right direction by rotating the threaded rod, so as to drive the sliding member to move in the left-right direction to adjust the gap between the inner circumferential surface of the second casing 2 and the first impeller 31.

In some embodiments, the air compressor 100 further includes a first motor 7, the first motor 7 is disposed on the first casing 1 and is spaced from the mounting member 8 along the length direction of the first casing 1, and an end of the driving member 9 away from the mounting member 8 is connected to the first motor 7 so as to drive the driving member 9 to rotate. Specifically, as shown in fig. 1-4, the first motor 7 is disposed on the first casing 1 and is disposed opposite to the mounting member 8 at an interval in the left-right direction, the left end of the driving member 9 is connected to the first motor 7, and the driving member 9 is driven to rotate by controlling the first motor 7, so as to drive the second casing 2 to move left and right.

In some embodiments, a side of the first shell 1 facing the second shell 2 is provided with a first sliding surface (not shown), and a side of the second shell 2 facing the first shell 1 is provided with a second sliding surface (not shown) cooperating with the first sliding surface. Specifically, the inner peripheral surface of the first housing 1 is provided with a first sliding surface, and the outer peripheral surface of the second housing 2 is provided with a second sliding surface, and the first sliding surface and the second sliding surface are in sliding fit, so that the second housing 2 smoothly rotates in the left-right direction.

In some embodiments, air compressor 100 further includes a sealing member (not shown) disposed on a side of the first sliding surface facing the second sliding surface, and/or a sealing member disposed on a side of the second sliding surface facing the first sliding surface. Specifically, the sealing member may be a rubber packing, and may be disposed on the first sliding surface or the second sliding surface according to actual conditions, so that the sealing member prevents the compressed gas from leaking from a gap between the first sliding surface and the second sliding surface, and ensures the airflow and the pressure ratio of the air outlet 11.

In some embodiments, the compression assembly 3 further comprises a first impeller 31 and a second motor 32.

The first impeller 31 is rotatably disposed in the second housing 2, the second motor 32 is disposed in the first housing 1, an outer circumferential surface of the second motor 32 and an inner circumferential surface of the first housing 1 are spaced to form an air flow passage 111, two ends of the air flow passage 111 are respectively communicated with the air inlet 21 and the air outlet 11, and the second motor 32 is connected to the first impeller 31 so as to drive the first impeller 31 to rotate. Thereby, the compression assembly 3 is more reasonably arranged.

In some embodiments, air compressor 100 further includes an adjusting assembly 10, adjusting assembly 10 is in communication with at least one of second shell 2 and air flow channel 111, and adjusting assembly 10 is used for discharging a portion of the compressed air so as to adjust a flow rate and a pressure ratio of the compressed air at the air outlet end. Specifically, as shown in fig. 1 to 4, the inlet of the regulating member 10 communicates with at least one of the second casing 2 and the air flow passage 111, and a part of the compressed air in the first casing 1 or the second casing 2 is discharged through the regulating member 10, thereby further regulating the flow rate and the pressure ratio of the compressed air at the air outlet 11.

In some embodiments, the regulating assembly 10 is in communication with the intake end and is located on a side of the first impeller 31 remote from the second motor 32 such that the compressed gas discharged through the regulating assembly 10 flows into the first casing 1. Specifically, as shown in fig. 1 to 4, the outlet of the adjusting assembly 10 is communicated with the second casing 2 and is located on the right side of the first impeller 31, so that the gas flowing out through the adjusting assembly 10 flows into the air inlet channel after being pressurized by the first impeller 31 again, the working efficiency of the air compressor 100 is improved, the gas is prevented from directly flowing into the gas flow channel 111, the internal flow field of the gas in the gas flow channel 111 is prevented from causing strong disturbance, and the flow loss in the gas flow channel 111 is reduced.

In some embodiments, air compressor 100 further includes a volute 6, a second impeller 4, and a turbine 5.

The scroll casing 6 includes a chamber 61, a first flow path 62, and a second flow path 63, the chamber 61 communicating with the air flow path 111, the first flow path 62 communicating with the chamber 61 and surrounding an outer peripheral side of the chamber 61, the second flow path 63 communicating with the chamber 61 and surrounding an outer peripheral side of the chamber 61, and the air outlet 11 formed on the first flow path 62.

The second impeller 4 and the turbine 5 are both rotatably arranged in the volute 6, the second impeller 4 is connected with the turbine 5, so that the turbine 5 drives the second impeller 4 to rotate, the second impeller 4 and the first flow channel 62 are oppositely arranged along the inner direction and the outer direction at intervals, so that the high-pressure gas is discharged through the first flow channel 62 by virtue of pressurization of the second impeller 4, and the turbine 5 and the second flow channel 63 are arranged along the inner direction and the outer direction at intervals, so that the gas in the second flow channel 63 drives the turbine 5 to rotate.

Specifically, as shown in fig. 4, a chamber 61 penetrates through a volute 6 in the left-right direction, a first flow passage 62 and a second flow passage 63 are circumferentially arranged on the outer peripheral side of the chamber 61, an air outlet 11 is formed at the free end of the first flow passage 62, a second impeller 4 and a turbine 5 are both rotatably arranged in the chamber 61, inlets of the second impeller 4 and the first flow passage 62 are oppositely arranged in the inside-outside direction, outlets of the turbine 5 and the second flow passage 63 are oppositely arranged in the inside-outside direction, the air outlet 11 can be connected with external equipment (such as an intercooler, a humidifier and a fuel cell stack), an inlet of the second flow passage 63 is communicated with an outlet of exhaust gas of the fuel cell stack, the exhaust gas of the fuel cell stack is flowed into the chamber 61 through the second flow passage 63 to drive the turbine 5 to rotate, and further, the second impeller 4 is driven to rotate, so that the working efficiency of the second motor 32 is improved, and the energy consumption of the second motor 32 is reduced. It can be understood that: this solution is applied to the air compressor 100 for the fuel cell or the air compressor 100 in which the pressure in the second flow passage 63 is lower than the pressure in the first flow passage 62.

In some embodiments, the modulation assembly 10 is in communication with the second flow passage 63 such that compressed gas flows into the second flow passage 63 to drive the turbine 5 to rotate. Specifically, as shown in fig. 1, the outlet of the adjusting assembly 10 is communicated with the second flow passage 63, so that the gas flowing out through the adjusting assembly 10 flows into the second flow passage 23 to drive the turbine 5 to rotate, thereby driving the second impeller 4 to rotate, and improving the working efficiency of the air compressor 100.

In some embodiments, the second housing further has a first passage 22, both ends of the first passage 22 are respectively communicated with the gas flow passage and the air inlet, so that the compressed gas in the gas flow passage flows into the air inlet through the first passage 22, and the regulating assembly is disposed in the first passage 22. Specifically, as shown in fig. 2-3, a first passage 22 is provided in the second housing, a left end of the first passage 22 is communicated with the airflow passage, a right end of the first passage 22 is communicated with the air inlet, and the adjusting component is provided in the first passage 22, so as to control the flow rate and the pressure ratio of the compressed air flowing out of the first passage 22, and thus control the flow rate and the pressure ratio of the compressed air flowing out of the air outlet.

In some embodiments, the air compressor further has a second channel 23, two ends of the second channel 23 are respectively communicated with the air inlet and the air outlet, two ends of the second channel 23 are respectively communicated with the air outlet and the air inlet, so that the compressed air in the air outlet flows into the air inlet through the second channel 23, and the adjusting assembly is disposed in the second channel 23. Specifically, as shown in fig. 1, the left end of the first channel 22 is communicated with the air outlet, the right end of the second channel 23 is communicated with the air inlet, and the adjusting component is disposed in the second channel 23, so as to control the flow rate and the pressure ratio of the compressed air flowing out from the air outlet in the second channel 23, and thus control the flow rate and the pressure ratio of the compressed air flowing out from the air outlet.

It will be appreciated that the second passage 23 may be any of a bellows, bellows or hose.

In some embodiments, as shown in fig. 1 to 4, the adjusting assembly includes a valve 101, a valve controller 102, and a valve motor (not shown), the valve motor is connected to the valve controller 102 and the valve 101, the valve controller 102 controls the motor to rotate to drive the valve 101, the valve 101 is disposed in the first channel 22 and the second channel 23, the valve controller 102 controls the valve motor according to actual conditions, and drives the valve 101 to move in the first channel 22 and the second channel 23 through the valve motor, so as to control the opening degree of the first channel 22 and the second channel 23, so as to control the airflow flowing through the first channel 22 and the second channel 23, and adjust the flow rate and the pressure ratio of the compressed gas at the air outlet end.

It can be understood that: the air compressor 100 of the embodiment of the present invention can be applied to a breathing machine, the actual breathing parameters of the patient are not sent to the controller of the second motor 32, but are fed back to the first motor 7 or the valve motor, and the pressure ratio and the flow rate of the air outlet are adjusted by adjusting the gap between the inner circumferential surface of the second shell 2 and the outer circumferential surface of the compression component 3, or leaking a part of the compressed air.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although the above embodiments have been shown and described, it should be understood that they are exemplary and should not be construed as limiting the present invention, and that many changes, modifications, substitutions and alterations to the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. An air compressor machine, its characterized in that includes:

a first housing having an air outlet;

the second shell is arranged at one end, far away from the air outlet, of the first shell, a part of the second shell penetrates through the first shell, and the second shell is provided with an air inlet communicated with the air outlet;

a compression assembly disposed within the first shell and a portion of the compression assembly located within the second shell to compress gas within the second shell, the second shell being movable relative to the first shell along a length direction of the first shell so as to adjust a gap between an inner circumferential surface of the second shell and an outer circumferential surface of the compression assembly to adjust a flow rate and a pressure ratio of the air flow of the outlet.

2. The air compressor of claim 1, further comprising:

the mounting piece is arranged on the second shell, and a threaded through hole extending along the length direction of the first shell is formed in the mounting piece;

the driving piece, the outer peripheral face of driving piece be equipped with screw thread that the screw thread through-hole cooperateed, the driving piece rotationally wears to establish in the screw thread through-hole, so that the driving piece drive the installed part moves along the length direction of first shell.

3. The air compressor as claimed in claim 2, further comprising a first motor disposed on the first casing, wherein the first motor and the mounting member are disposed opposite to each other at a distance along the length direction of the first casing, and one end of the driving member remote from the mounting member is connected to the first motor so as to drive the driving member to rotate.

4. The air compressor as claimed in claim 1, wherein a side of said first casing facing said second casing is provided with a first sliding surface, and a side of said second casing facing said first casing is provided with a second sliding surface cooperating with said first sliding surface.

5. The air compressor of claim 4, further comprising a sealing member disposed on a side of the first sliding surface facing the second sliding surface, and/or a side of the second sliding surface facing the first sliding surface.

6. The air compressor of claim 1, further comprising:

a first impeller rotatably disposed within the second housing;

the second motor is arranged in the first shell, the outer peripheral surface of the second motor and the inner peripheral surface of the first shell are arranged at intervals to form an airflow channel, two ends of the airflow channel are respectively communicated with the air inlet and the air outlet, and the second motor is connected with the first impeller so as to drive the first impeller to rotate.

7. The air compressor of claim 6, further comprising an adjustment assembly in communication with at least one of the second casing and the airflow channel, the adjustment assembly being configured to discharge a portion of the compressed air so as to adjust a flow rate and a pressure ratio of the compressed air at the outlet end.

8. The air compressor as claimed in claim 7, wherein said regulating member is in communication with said intake end and is located on a side of said first impeller remote from said second motor, so that the compressed air discharged through said regulating member flows into said first casing.

9. The air compressor of any one of claim 6, further comprising:

a volute including a chamber communicating with the airflow passage, a first flow passage communicating with the chamber and surrounding an outer circumferential side of the chamber, and a second flow passage communicating with the chamber and surrounding an outer circumferential side of the chamber, the outlet being formed on the first flow passage;

the second impeller and the turbine are both rotatably arranged in the volute, the second impeller is connected with the turbine so that the turbine can drive the second impeller to rotate, the second impeller and the first flow channel are oppositely arranged at intervals in the inner and outer directions so that high-pressure gas is discharged through the first flow channel after being pressurized by the second impeller, and the turbine and the second flow channel are arranged at intervals in the inner and outer directions so that the turbine is driven to rotate by the gas in the second flow channel.

10. The air compressor as claimed in claim 9, wherein said regulating assembly is in communication with said second flow passage for the flow of compressed air into said second flow passage to drive said turbine to rotate.