CN119288868A

CN119288868A - A motor external pump body structure and a compressor having the same

Info

Publication number: CN119288868A
Application number: CN202411712923.XA
Authority: CN
Inventors: 牟迪; 丁少鹏; 王珺; 杨欧翔
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2024-11-27
Filing date: 2024-11-27
Publication date: 2025-01-10

Abstract

The invention discloses an external pump body structure of a motor, which comprises a motor component and a pump body component, wherein the motor component comprises an outer stator and an inner rotor coaxially sleeved on the outer stator, the pump body component comprises an outer cylinder and an inner cylinder eccentrically embedded with the outer cylinder, the outer cylinder is fixedly connected with the inner rotor and is provided with an inner cylinder body and an outer cylinder body coaxially arranged, the inner wall of the outer cylinder body is tangent with the outer wall of the inner cylinder to form a first air suction cavity and a first compression cavity, the inner wall of the inner cylinder is tangent with the outer wall of the inner cylinder body to form a second air suction cavity and a second compression cavity, and air flow passages respectively communicated with the first air suction cavity, the first compression cavity, the second air suction cavity and the second compression cavity are further arranged on the pump body component and the motor component. The compressor adopting the structure increases the volume utilization rate of the compressor, increases the displacement in a limited space, is beneficial to the miniaturization of the compressor, and integrally reduces the height of the compressor, so that the compressor can be applied to a scene with limited height.

Description

External pump body structure of motor and compressor with external pump body structure

Technical Field

The invention relates to the technical field of compressors, in particular to an external pump body structure of a motor and a compressor with the external pump body structure.

Background

The motor and the pump body structure of the existing rotor compressor are in different heights, and the height of the compressor is required to be larger than the sum of the two heights, so that the whole height is higher, and the use of the rotor compressor under the condition of limited installation space height is limited. The existing compressor and pump body structural design has the defects that the rotor compressor occupies large space, the volume utilization rate is low, the compressor is not beneficial to miniaturization, the centrifugal force of a rotor compressor balancing weight is increased along with the increase of the rotating speed, the deflection of a crankshaft is increased, further the problems of vibration noise and the like of the compressor are increased, and even abrasion between a rotor and a stator is likely to occur.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides an external pump body structure of a motor and a compressor with the external pump body structure, so as to solve the technical problems of low internal volume rate and high vibration noise of the existing motor and body structure.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

in a first aspect, an embodiment of the present invention provides an external pump body structure of a motor, including a motor assembly and a pump body assembly sleeved in the motor assembly;

the motor assembly comprises an outer stator and an inner rotor coaxially sleeved in the outer stator;

the pump body component comprises an outer cylinder and an inner cylinder eccentrically embedded with the outer cylinder;

the outer cylinder is fixedly connected to the inner rotor, the outer cylinder rotates to synchronously drive the inner cylinder to rotate, the outer cylinder is provided with an inner cylinder body and an outer cylinder body which are coaxially arranged, the inner wall of the outer cylinder body is tangent with the outer wall of the inner cylinder body to form a first air suction cavity and a first compression cavity, the inner wall of the inner cylinder is tangent with the outer wall of the inner cylinder body to form a second air suction cavity and a second compression cavity, and the motor assembly and the pump body assembly are further provided with air flow channels which are respectively communicated with the first air suction cavity, the first compression cavity, the second air suction cavity and the second compression cavity.

The pump body assembly comprises a pump body assembly body and a motor assembly body, wherein the pump body assembly body and the motor assembly body are axially arranged at equal heights.

The cylinder sliding plate is characterized in that a through cylindrical surface hole is formed in the side wall of the inner cylinder, a sliding shaft is arranged in the cylindrical surface hole, the outer cylinder body is connected with the inner cylinder body through a cylinder sliding plate extending radially from the inner wall of the outer cylinder body, and the cylinder sliding plate penetrates through the sliding shaft.

The sliding shaft comprises a first sliding block and a second sliding block, the first sliding block and the second sliding block are oppositely arranged, a perforation is formed between the first sliding block and the second sliding block, the opposite surfaces of the first sliding block and the second sliding block are column surfaces, the column surfaces are attached to the column surface holes, and the cylinder sliding sheet penetrates through the perforation.

The inner rotor and the outer cylinder are of an integrated structure, and a cylinder cavity and a magnetic steel groove of the inner cylinder are embedded in the inner rotor and the outer cylinder which are integrated.

The top of the motor assembly is further provided with an upper flange, the bottom of the motor assembly is further provided with a lower flange, the top of the outer cylinder is provided with a protruding rotating shaft, the lower flange is provided with a mounting groove, the rotating shaft is rotationally connected with the upper flange, and the lower end of the inner cylinder is inserted into the mounting groove.

The air flow channel comprises a first air suction port and a first air exhaust port which are arranged on the lower flange, a second air suction port is arranged on the side wall of the inner cylinder, and a second air exhaust port is arranged on the outer cylinder.

Wherein, the first exhaust port and the second exhaust port are internally provided with exhaust valves.

The upper flange and the motor assembly are coaxially arranged, a shaft connecting hole is formed in the middle of the upper flange, and the rotating shaft penetrates through the shaft connecting hole.

In a second aspect, an embodiment of the present invention further provides a compressor, where the compressor includes the motor external pump structure as described in any one of the above.

According to the external pump body structure of the motor and the compressor with the external pump body structure, the motor component and the pump body component are positioned at the same height, so that the height of the whole machine is greatly reduced. The pump body structure realizes the volume change in the rotating process by using the eccentrically mounted inner cylinder, can realize the air suction and exhaust process, fully utilizes the volume inside the outer cylinder, increases the air suction and exhaust volume in a limited space, increases the displacement of the compressor, is beneficial to the miniaturization of the compressor, reduces the overall height of the compressor, and is suitable for the highly limited environment. The whole machine does not need a balance weight, vibration can be reduced, the motor and the pump body can be mostly overlapped, a long shaft is not needed, so that the problem of large deflection of a crankshaft is avoided, the high speed of the compressor is not limited due to the increase of the deflection of the crankshaft caused by high rotation speed, and the pump body with the structure is not limited by the rotation speed.

The foregoing description is only an overview of the present invention, and is intended to be more clearly understood as being carried out in accordance with the following description of the preferred embodiments, as well as other objects, features and advantages of the present invention.

Drawings

Fig. 1 and fig. 2 are schematic views of the overall structure of the external pump body structure of the motor according to the embodiment of the invention at different angles.

Fig. 3 is an axial cross-sectional view of an external pump body structure of a motor according to an embodiment of the present invention.

Fig. 4 is an exploded view of an external pump body structure of a motor according to an embodiment of the present invention.

Fig. 5 is a radial cross-sectional view of an external pump body structure of a motor according to an embodiment of the present invention.

Fig. 6 is a radial cross-sectional view of an outer cylinder portion of an outboard motor pump body according to an embodiment of the invention.

Fig. 7 is a perspective view of an outer cylinder portion of an external pump body structure of a motor according to an embodiment of the present invention.

Fig. 8 is a schematic view of a part of a sliding vane of a cylinder with an external pump structure of a motor according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of an inner cylinder part of an external pump body structure of a motor according to an embodiment of the present invention.

Fig. 10 is a radial cross-sectional view of an inner cylinder portion of an outboard motor pump body according to an embodiment of the invention.

Fig. 11 and fig. 12 are schematic views of different view angles of a lower flange portion of an external pump body structure of a motor according to an embodiment of the present invention.

Fig. 13 to 16 are schematic diagrams of a gas compression process of an external pump structure of a motor according to an embodiment of the present invention.

Fig. 17 is a schematic structural diagram of another embodiment of an external pump body structure of a motor according to an embodiment of the present invention.

Reference numerals illustrate:

The motor external pump body structure 100, the motor assembly 10, the pump body assembly 20, the upper flange 1, the shaft connection hole 11, the outer stator 2, the inner rotor 3, the outer cylinder 4, the outer cylinder 41, the cylinder sliding sheet 42, the inner cylinder 43, the second exhaust port 44, the rotating shaft 45, the sliding shaft 5, the first sliding block 51, the second sliding block 51, the perforation 52, the inner cylinder 6, the second air suction port 61, the cylindrical surface hole 62, the hole wall 621, the lower flange 7, the first air suction port 71, the first exhaust port 72, the mounting groove 73, the first air suction cavity A, the first compression cavity B, the second air suction cavity a, the second compression cavity B, the integrated structure 30, the outer tube 301, the inner cylinder 302 and the magnetic steel groove 303.

Detailed Description

The present invention will be described in further detail with reference to the drawings and the detailed description, in order to make the objects, technical solutions and advantages of the present invention more apparent.

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

In the description of the present invention, 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", etc. indicate orientations or positional relationships as described based on the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

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 one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms should not be understood as necessarily being 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.

The motor and the pump body structure of the existing rotor compressor are in different heights, and the height of the compressor is required to be larger than the sum of the two heights, so that the whole height is higher, and the use of the rotor compressor under the condition of limited installation space height is limited. The existing compressor and pump body structural design has the defects that the rotor compressor occupies large space, the volume utilization rate is low, the compressor is not beneficial to miniaturization, the centrifugal force of a rotor compressor balancing weight is increased along with the increase of the rotating speed, the deflection of a crankshaft is increased, further the problems of vibration noise and the like of the compressor are increased, and even abrasion between a rotor and a stator is likely to occur. Thus, based on the above-mentioned requirements, the present embodiment provides an external pump body structure 100 of a motor.

Referring to fig. 1 to 12, the present embodiment discloses an external pump body structure 100 of a motor, which includes a motor assembly 10 and a pump body assembly 20 sleeved in the motor assembly 10, that is, the pump body assembly 20 is disposed in the motor assembly 10, and the pump body structure in the external motor is configured such that the motor assembly 10 rotates to synchronously drive the pump body assembly 20 to compress gas.

The motor assembly 10 comprises an outer stator 2 and an inner rotor 3 coaxially sleeved in the outer stator 2. The main body of the outer stator 2 is of an annular structure, and a plurality of wire grooves around which coils are wound are formed in the main body. The outer stator 2 is also fixedly connected to an outer housing for protecting and supporting the outer stator 2, the outer housing structure not being shown in the drawings of the present embodiment.

The pump body assembly 20 comprises an outer cylinder 4 and an inner cylinder 6 eccentrically embedded with the outer cylinder 4, wherein the lower end of the outer cylinder 4 is provided with an opening, the inner cylinder 6 is embedded into a cylinder cavity of the outer cylinder 4 through the lower end opening, the upper end of the inner cylinder 6 is provided with an opening, and the inner cylinder 6 and the outer cylinder 4 are eccentrically arranged, so that the size of an inner cavity is changed when the inner cylinder is driven to rotate, and the air suction, compression and exhaust processes are sequentially completed. As shown in fig. 4, the outer cylinder 4 is of a circular tube structure, the main body of the inner cylinder 6 is also of a circular tube structure, and the eccentric arrangement of the two means that the central axis of the outer cylinder 4 is not coincident with the central axis of the inner cylinder 6, and when the outer cylinder 4 rotates relative to the inner cylinder 6, the volume of a compression cavity formed between the two changes dynamically, so that the air suction and compression processes are realized.

The outer cylinder 4 is fixedly connected to the inner rotor 3, the outer cylinder 4 rotates to synchronously drive the inner cylinder 6 to rotate, the outer cylinder 4 is provided with an inner cylinder body 43 and an outer cylinder body 41 which are coaxially arranged, the inner wall of the outer cylinder body 41 is tangent with the outer wall of the inner cylinder 6 to form a first air suction cavity A and a first compression cavity B, the inner wall of the inner cylinder 6 is tangent with the outer wall of the inner cylinder body 43 to form a second air suction cavity a and a second compression cavity B, and the inner cylinder 6 and the outer cylinder 4 are further provided with air flow channels which are respectively communicated with the first air suction cavity A, the first compression cavity B, the second air suction cavity a and the second compression cavity B.

Referring again to fig. 2 and 3, the body of the pump body assembly 20 and the body of the motor assembly 10 are disposed at equal heights in the axial direction. That is, the outer stator 2, the inner rotor 3, and the outer cylinder 4 and the inner cylinder 6 are disposed at substantially equal heights in the axial direction.

In this embodiment, the pump body assembly 20 is embedded in the motor assembly 10, and the pump body assembly and the motor assembly are arranged at equal heights, so that the overall height is reduced, the miniaturization design of the whole machine is facilitated, and the motor assembly is particularly suitable for some scenes with limited heights. The problem that the high-speed rotation of the compressor is limited due to the fact that the deflection of a crankshaft is increased caused by the fact that the existing motor is separated from the pump body and connected through a rotating shaft is avoided.

Specifically, referring to fig. 5, 8 and 9 again, a cylindrical hole 62 penetrating the inside and the outside of the cylinder body is formed in the side wall of the inner cylinder 6, a sliding shaft 5 is disposed in the cylindrical hole 62, the outer cylinder 41 is connected with the inner cylinder 43 through a cylinder sliding sheet 42 extending radially from the inner wall of the outer cylinder 41, and the cylinder sliding sheet 42 is disposed through the sliding shaft 5.

The cylindrical surface hole 62 is a through groove penetrating through the inner part and the outer part of the inner cylinder 6, and the inner hole wall 621 of the cylindrical surface hole 62 is a cylindrical surface, so that the sliding shaft 5 can rotate in the cylindrical surface hole 62 in a limited manner. Because the inner cylinder 6 and the outer cylinder 4 are eccentrically arranged, when the inner rotor 3 drives the outer cylinder 4 to rotate and synchronously drives the inner cylinder 6 to rotate, the inner cylinder 6 and the outer cylinder are not coaxial and have equal speed, and therefore, the cylinder sliding sheet 42 between the inner cylinder body 43 and the outer cylinder body 41 is movably connected with the sliding shaft 5.

As shown in fig. 5, in this state, the outer wall of the inner cylinder 6 is tangent to the inner wall of the outer cylinder 41, and in the axial space, the space formed between the inner cylinder 6 and the outer cylinder 41 is partitioned into the first suction chamber a and the first compression chamber B by the cylinder vane 42. Similarly, the outer wall of the inner cylinder body 43 is tangent to the inner wall of the inner cylinder 6, so that the axial space between the two is partitioned into the second suction chamber a and the second compression chamber b by the cylinder vane 42. That is, the first suction chamber a, the first compression chamber B, the second suction chamber a, and the second compression chamber B are each formed by dividing an axial space formed by the tangential position of the outer cylinder 4 and the inner cylinder 6 into two spaces again by the cylinder sliding vane 42.

In order to make maximum use of the internal cavity space of the pump body assembly 20, the cylinder slide 42 is radially extended and has an axial height close to that of the outer cylinder 4.

The sliding shaft 5 comprises a first sliding block 51 and a second sliding block 51, the first sliding block 51 and the second sliding block 51 are oppositely arranged, a perforation 52 is formed between the first sliding block 51 and the second sliding block 51, opposite surfaces of the first sliding block 51 and the second sliding block 51 are cylindrical surfaces, the cylindrical surfaces are attached to the cylindrical surface holes 621, and the air cylinder sliding piece 42 penetrates through the perforation 52. In the process that the outer cylinder 4 drives the inner cylinder 6 to rotate, the whole sliding shaft 5 can rotate in the cylindrical hole 62, but cannot be separated from the cylindrical hole 62, and the cylinder sliding vane 42 is positioned in the through hole 52 formed by the first sliding vane 51 and the second sliding vane 51 oppositely, so that a certain movable space is reserved between the cylinder sliding vane 42 and the sliding shaft 5.

Specifically, as shown in fig. 5, the air flow channel includes a first air suction opening 71 and a first air discharge opening 72 formed in the lower flange 7, a second air suction opening 61 formed in a side wall of the inner cylinder 6, and a second air discharge opening 44 formed in the outer cylinder 4, and the suction and discharge paths of the air discharge openings and the air suction opening and the air suction, compression and discharge processes are described in detail below with reference to fig. 13 to 16.

Wherein, the first exhaust port 72 and the second exhaust port 44 are respectively provided with an exhaust valve, and the exhaust valves are controlled to be opened and closed according to the corresponding working states.

Please refer to fig. 17 again, which is a second embodiment of the external pump body structure 100 of the motor, in this embodiment, the inner rotor 3 and the outer cylinder 4 are integrally formed with a structure 30, and a cylinder cavity and a magnetic steel groove 303 embedded in the inner cylinder 6 are formed in the inner rotor and the outer cylinder of the integrally formed structure 30. The outer tube 301 corresponds to the structure of the combination of the inner rotor 3 and the outer cylinder 4, and the inner cylinder 302 corresponds to the structure of the inner cylinder 43 of the above embodiment in terms of structure and function. The manner of assembly with the inner cylinder 6 is the same as that of the above embodiment, and will not be described here again. The outer part of the outer tube 301 is sleeved with the outer stator 2. The magnet steel groove 303 is embedded with a magnet so as to form a rotor functional unit.

In this second embodiment, since the inner rotor 3 and the outer cylinder 4 are designed as an integrally formed structure 30, the structure is simpler, the material consumption is less, the cost is lower, and the rotational friction between the inner rotor 3 and the outer cylinder 4 can be reduced.

In this second embodiment, the motor external pump body structure operates in the same manner as in the above embodiment.

Referring to fig. 1 to 5 again, the top end of the motor assembly 10 is further provided with an upper flange 1, the bottom end of the motor assembly 10 is further provided with a lower flange 7, the top end of the outer cylinder 4 is provided with a protruding rotating shaft 45, the lower flange 7 is provided with a mounting groove 73, the rotating shaft 45 is rotatably connected with the upper flange 1, and the lower end of the inner cylinder 6 is inserted into the mounting groove 73. Wherein the upper flange 1, the lower flange 7 and the outer part of the outer stator 2 are jointly connected and fixed to an outer housing (not shown in the figures) for providing assembly support for the outer stator 2, the upper flange 1 and the lower flange 7.

Further, the upper flange 1 and the motor assembly 10 are coaxially arranged, a shaft connection hole 11 is formed in the middle of the upper flange 1, and the rotating shaft 45 is arranged in the shaft connection hole 11 in a penetrating manner.

The outer cylinder 4 is rotationally connected to the shaft connecting hole 11 on the upper flange 1 through the rotating shaft 45 connected with the outer cylinder, the lower end part of the inner cylinder 6 is rotationally connected with the mounting groove 73 of the lower flange 7 assembled with the inner cylinder, and the lower flange 7 and the upper flange 1 are fixedly connected to the same outer shell, so that the whole motor assembly 10 can drive the pump body assembly 20, and the operation is stable and reliable.

The embodiment of the invention also provides a compressor which comprises the motor external pump body structure.

The external pump body structure of motor and have its compressor of this embodiment, motor assembly and pump body subassembly are in the contour position, have reduced the height of complete machine by a wide margin. The pump body structure realizes the volume change in the rotating process by using the eccentrically mounted inner cylinder, can realize the air suction and exhaust process, fully utilizes the volume inside the outer cylinder, increases the air suction and exhaust volume in a limited space, increases the displacement of the compressor, and is beneficial to the miniaturization of the compressor. The whole machine does not need a balance weight, vibration can be reduced, the motor and the pump body can be mostly overlapped, a long shaft is not needed, so that the problem of large deflection of a crankshaft is avoided, the high speed of the compressor is not limited due to the increase of the deflection of the crankshaft caused by high rotation speed, and the pump body with the structure is not limited by the rotation speed. The volume utilization rate of the compressor is increased, the displacement is increased in a limited space, the compressor is miniaturized, the compressor is particularly suitable for a scene with limited height, and the weight and the cost of the compressor can be reduced.

Referring again to fig. 13 to 16, the following outline of the operation of the pump structure 100 is provided:

According to the compression process schematic diagram of the embodiment of the present invention, in fig. 13, the volume of the first compression chamber B is zero, the first suction chamber a reaches the maximum, and the inner cylinder 6 is in a state of just completing the suction and exhaust of the previous cycle, and is in a state of suction and compression of one cycle, the inner cylinder 6 is divided into a second suction chamber a and a second compression chamber B, and the second suction chamber a of the inner cylinder 6 sucks air from the first suction chamber a of the outer cylinder 4 through the second suction port 61. When the process from fig. 13 to fig. 14 is completed, the first suction chamber a of the previous cycle is changed to the first compression chamber B in the outer cylinder 4, the gas is compressed, the first suction chamber a of the present cycle is formed, the suction of the present cycle is started, the suction is performed through the first suction port 71, the second suction chamber a of the inner cylinder 6 is sucked from the first suction chamber a of the outer cylinder through the suction port 61, the gas is compressed by the second compression chamber B, and the gas is discharged from the discharge port 44 after the discharge pressure is reached. When the rotary motion from fig. 14 to fig. 15, the first suction cavity a of the outer cylinder continues to suck air, the first compression cavity B continues to compress, the second compression cavity B of the inner cylinder 6 completes the air discharge and the final volume is zero, the air discharge and suction of one cycle is completed, and the volume of the second suction cavity a reaches the maximum. When turning from fig. 15 to fig. 16, the first suction chamber a of the outer cylinder 4 continues suction, the first compression chamber B continues compression, and after reaching the discharge pressure, discharge is performed, the discharge port 72 discharges air, the inner cylinder 6 reforms the second suction chamber a of the next cycle, and changes the second suction chamber a of the previous cycle into the second compression chamber B, compressing the gas sucked in the previous cycle. The intake and exhaust processes of the outer cylinder 4 are fig. 13 to 14 to 15 to 16, and the intake and exhaust processes of the inner cylinder 6 are fig. 15 to 16 to 13 to 14.

The foregoing examples are provided to further illustrate the technical contents of the present invention for the convenience of the reader, but are not intended to limit the embodiments of the present invention thereto, and any technical extension or re-creation according to the present invention is protected by the present invention. The protection scope of the invention is subject to the claims.

Claims

1. The external pump body structure of the motor is characterized by comprising a motor component and a pump body component sleeved in the motor component;

The pump body component comprises an outer cylinder, an inner cylinder eccentrically embedded with the outer cylinder, and a pump body component, wherein the outer cylinder is fixedly connected with the inner rotor and synchronously drives the inner cylinder to rotate;

The outer cylinder is provided with an inner cylinder body and an outer cylinder body which are coaxially arranged, the inner wall of the outer cylinder body is tangent with the outer wall of the inner cylinder body to form a first air suction cavity and a first compression cavity, the inner wall of the inner cylinder body is tangent with the outer wall of the inner cylinder body to form a second air suction cavity and a second compression cavity, and the motor assembly and the pump body assembly are further provided with air flow channels which are respectively communicated with the first air suction cavity, the first compression cavity, the second air suction cavity and the second compression cavity.

2. The motor external pump body structure according to claim 1, wherein the main body of the pump body assembly and the main body of the motor assembly are arranged at equal heights in the axial direction.

3. The motor external pump body structure according to claim 1, wherein a through cylindrical surface hole is formed in the side wall of the inner cylinder, a sliding shaft is arranged in the cylindrical surface hole, the outer cylinder body is connected with the inner cylinder body through a cylinder sliding sheet extending radially from the inner wall of the outer cylinder body, and the cylinder sliding sheet penetrates through the sliding shaft.

4. The motor external pump body structure according to claim 3, wherein the sliding shaft comprises a first sliding block and a second sliding block, the first sliding block and the second sliding block are oppositely arranged, a perforation is formed between the first sliding block and the second sliding block, the opposite surfaces of the first sliding block and the second sliding block are cylindrical surfaces, the cylindrical surfaces are attached to the cylindrical surface holes, and the cylinder sliding sheet penetrates through the perforation.

5. The external pump body structure of the motor according to claim 1, wherein the inner rotor and the outer cylinder are integrally formed, and a cylinder cavity embedded with the inner cylinder and a magnetic steel groove for assembling a magnet are formed in the inner rotor and the outer cylinder which are integrally formed.

6. The motor external pump body structure according to any one of claims 1 to 5, wherein an upper flange is further arranged at the top end of the motor assembly, a lower flange is further arranged at the bottom end of the motor assembly, a protruding rotating shaft is arranged at the top end of the outer cylinder, a mounting groove is formed in the lower flange, the rotating shaft is rotatably connected to the upper flange, and the lower end of the inner cylinder is inserted into the mounting groove.

7. The motor external pump body structure according to claim 6, wherein the air flow channel comprises a first air suction port and a first air exhaust port which are arranged on the lower flange, a second air suction port which is arranged on the side wall of the inner cylinder, and a second air exhaust port which is arranged on the outer cylinder.

8. The motor external pump body structure according to claim 7, wherein exhaust valves are arranged in the first exhaust port and the second exhaust port.

9. The motor external pump body structure according to claim 8, wherein the upper flange and the motor assembly are coaxially arranged, a shaft connecting hole is formed in the middle of the upper flange, and the rotating shaft penetrates through the shaft connecting hole.

10. A compressor comprising an external pump structure of an electric motor according to any one of claims 1 to 9.