Motor external pump body structure and compressor with same

Abstract

The invention discloses an external pump body structure of a motor. The external pump body structure comprises a motor assembly and a pump body assembly, the motor assembly comprises an outer stator and an inner rotor coaxially sleeved with the outer stator. The pump body assembly comprises an outer air cylinder and an inner air cylinder eccentrically embedded in the outer air cylinder. The outer air cylinder is fixedly connected to the inner rotor and 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 to the outer wall of the inner air cylinder to form a first air suction cavity and a first compression cavity, and the inner wall of the inner air cylinder is tangent to the outer wall of the inner cylinder body to form a second air suction cavity and a second compression cavity. The pump body assembly and the motor assembly are further provided with airflow channels communicating with the first air suction cavity, the first compression cavity, the second air suction cavity and the second compression cavity correspondingly. According to the compressor adopting the structure, the volume utilization rate of the compressor is increased, the displacement is increased in a limited space, the miniaturization of the compressor is facilitated, the height of the compressor is integrally reduced, and the compressor can be applied to a scene with limited height.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a motor-external pump body structure and a compressor having the same. Background Art

[0002] The existing rotor compressor motor and pump body structure are at different heights, and the compressor height needs to be greater than the sum of the two heights. Therefore, the overall height is relatively high, which limits its use in installation space with limited height. The disadvantages of the existing compressor and pump body structure design are: the rotor compressor occupies a large space, has a low volume utilization rate, and is not conducive to the miniaturization of the compressor; the centrifugal force of the rotor compressor balance block increases with the increase of speed, resulting in an increase in the deflection of the crankshaft, which in turn causes the vibration and noise of the compressor to intensify, and may even cause wear between the rotor and the stator. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a motor-external pump body structure and a compressor having the same, so as to solve the technical problems of low internal volume ratio and high vibration and noise of the existing motor and body structure.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] In a first aspect, an embodiment of the present invention provides a motor-external pump body structure, which comprises: a motor assembly and a pump body assembly sleeved inside the motor assembly;

[0006] The motor assembly comprises: an outer stator, and an inner rotor coaxially sleeved inside the outer stator;

[0007] The pump assembly comprises: an outer cylinder, an inner cylinder eccentrically embedded in the outer cylinder;

[0008] Among them, the outer cylinder is fixedly connected to the inner rotor, and the rotation of the outer cylinder synchronously drives the inner cylinder to rotate. The outer cylinder has an inner cylinder body and an outer cylinder body arranged coaxially. The inner wall of the outer cylinder body is tangent to the outer wall of the inner cylinder to form a first suction chamber and a first compression chamber, and the inner wall of the inner cylinder is tangent to the outer wall of the inner cylinder body to form a second suction chamber and a second compression chamber. The motor assembly and the pump body assembly are also provided with air flow channels respectively connecting the first suction chamber, the first compression chamber, the second suction chamber and the second compression chamber.

[0009] Wherein, the main body of the pump body assembly and the main body of the motor assembly are arranged at the same height in the axial direction.

[0010] The side wall of the inner cylinder is provided with a penetrating cylindrical hole, a sliding shaft is provided in the cylindrical hole, the outer cylinder body and the inner cylinder body are connected by a cylinder slide radially extending from the inner wall of the outer cylinder body, and the cylinder slide is passed through the sliding shaft.

[0011] Among them, the sliding shaft includes a first slider and a second slider, the first slider and the second slider are arranged opposite to each other, and a through hole is formed therebetween. The opposite back surfaces of the first slider and the second slider are both cylindrical surfaces, the cylindrical surfaces are fitted with the cylindrical hole, and the cylinder slide is penetrated through the through hole.

[0012] The inner rotor and the outer cylinder are an integrally formed structure, and a cylinder cavity for embedding the inner cylinder and a magnetic steel groove are provided inside the integrally formed inner rotor and the outer cylinder.

[0013] Among them, the top end of the motor assembly is also provided with an upper flange, the bottom end of the motor assembly is also provided with a lower flange, the top end of the outer cylinder is provided with a protruding rotating shaft, the lower flange is provided with a mounting groove, the rotating shaft is rotatably connected to the upper flange, and the lower end of the inner cylinder is inserted into the mounting groove.

[0014] Wherein, the air flow channel includes a first air intake port and a first air exhaust port opened on the lower flange, a second air intake port opened on the side wall of the inner cylinder, and a second air exhaust port opened on the outer cylinder.

[0015] Wherein, exhaust valves are provided in the first exhaust port and the second exhaust port.

[0016] Wherein, the upper flange is coaxially arranged with the motor assembly, a shaft connection hole is arranged in the middle of the upper flange, and the rotating shaft passes through the shaft connection hole.

[0017] In a second aspect, an embodiment of the present invention further provides a compressor, comprising a motor-external pump body structure as described in any one of the above.

[0018] The motor-external pump body structure of the present invention and the compressor having the same are such that the motor assembly and the pump body assembly are at the same height, which greatly reduces the height of the whole machine. The pump body structure uses an eccentrically mounted inner cylinder to achieve volume changes during rotation, which can realize the suction and exhaust process, fully utilize the volume inside the outer cylinder, increase the suction and exhaust volume within a limited space, increase the compressor displacement, and facilitate the miniaturization of the compressor, reduce its overall height, and be suitable for environments with restricted height. The whole machine does not require a balancing block, which can reduce vibration, and the height of the motor and the pump body can mostly overlap, without the need for a long shaft, so there is no problem of large crankshaft deflection, and the high-speed of the compressor will not be limited due to the increase in crankshaft deflection caused by high speed. The pump body of this structure is not limited by speed.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 and Figure 2 Schematic diagram of the overall structure of the motor external pump body structure from different perspectives of an embodiment of the present invention.

[0021] Figure 3 It is an axial cross-sectional view of the motor external pump body structure according to an embodiment of the present invention.

[0022] Figure 4 This is an exploded view of the motor external pump body structure of an embodiment of the present invention.

[0023] Figure 5 It is a radial cross-sectional view of the motor external pump body structure according to an embodiment of the present invention.

[0024] Figure 6 This is a radial cross-sectional view of the outer cylinder portion of the motor external pump body structure according to an embodiment of the present invention.

[0025] Figure 7 This is a perspective view of the outer cylinder portion of the motor external pump body structure according to an embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of the structure of the cylinder vane portion of the motor external pump body structure according to an embodiment of the present invention.

[0027] Fig. 9 This is a schematic diagram of the structure of the inner cylinder portion of the motor external pump body structure according to an embodiment of the present invention.

[0028] Fig.10 It is a radial cross-sectional view of the inner cylinder portion of the motor external pump body structure according to an embodiment of the present invention.

[0029] Fig.11 and Fig.12 Schematic diagram of the structure of the lower flange part of the motor external pump body structure according to an embodiment of the present invention from different perspectives.

[0030] Figures 13 to 16 Schematic diagram of the gas compression process of the motor external pump structure according to an embodiment of the present invention.

[0031] Fig.17 This is a schematic structural diagram of another implementation of the motor external pump body structure of an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] Motor external pump body structure 100, motor assembly 10, pump body assembly 20, upper flange 1, shaft connection hole 11, outer stator 2, inner rotor 3, outer cylinder 4, outer cylinder body 41, cylinder slide 42, inner cylinder body 43, second exhaust port 44, rotating shaft 45, sliding shaft 5, first slider 51, second slider 51, through hole 52, inner cylinder 6, second air intake port 61, cylindrical hole 62, hole wall 621, lower flange 7, first air intake port 71, first exhaust port 72, mounting groove 73, first air intake chamber A, first compression chamber B, second air intake chamber a, second compression chamber b, one-piece molding structure 30, outer tube 301, inner cylinder body 302, magnetic steel groove 303. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0041] The existing rotor compressor motor and pump body structure are at different heights, and the height of the compressor needs to be greater than the sum of the heights of the two. Therefore, the overall height is relatively high, which limits its use in installation spaces with limited height. The disadvantages of the existing compressor and pump body structure design are: the rotor compressor occupies a large space and has a low volume utilization rate, which is not conducive to the miniaturization of the compressor; the centrifugal force of the rotor compressor balance block increases with the increase in speed, resulting in an increase in the crankshaft deflection, which in turn causes the compressor vibration and noise problems to intensify, and even wear between the rotor and the stator may occur. Therefore, based on the above requirements, this embodiment provides a motor external pump body structure 100.

[0042] See also Figures 1 to 12This embodiment discloses a motor-external pump body structure 100, 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 arranged inside the motor assembly 10, and the structure of the outer motor and the inner pump body is that the motor assembly 10 rotates synchronously to drive the pump body assembly 20 to compress the gas.

[0043] The motor assembly 10 includes: an outer stator 2, and an inner rotor 3 coaxially sleeved in the outer stator 2. The outer stator 2 is a ring-shaped structure, and a plurality of wire slots for winding coils are arranged therein. The outer stator 2 is also fixedly connected to an outer shell, which is used to protect and support the outer stator 2. The outer shell structure is not shown in the drawings of this embodiment.

[0044] The pump assembly 20 includes: an outer cylinder 4, and an inner cylinder 6 eccentrically embedded in the outer cylinder 4; the lower end of the outer cylinder 4 is open, and the inner cylinder 6 is embedded in the cylinder cavity of the outer cylinder 4 through the lower end opening, and the upper end of the inner cylinder 6 is open. The inner cylinder 6 is eccentrically arranged with the outer cylinder 4, so that the size of the internal cavity changes when it is driven to rotate, and the suction, compression and exhaust processes are completed in sequence. Figure 4 As shown, the main body of the outer cylinder 4 is a circular tube structure, and the main body of the inner cylinder 6 is also a circular tube structure. The eccentric setting of the two means that the central axis of the outer cylinder 4 does not coincide with the central axis of the inner cylinder 6. When the outer cylinder 4 rotates relative to the inner cylinder 6, the volume of the compression cavity formed between the two changes dynamically, thereby realizing the suction and compression process.

[0045] Among them, the outer cylinder 4 is fixedly connected to the inner rotor 3, and the rotation of the outer cylinder 4 synchronously drives the inner cylinder 6 to rotate. The outer cylinder 4 has a coaxially arranged inner cylinder body 43 and an outer cylinder body 41. The inner wall of the outer cylinder body 41 is tangent to the outer wall of the inner cylinder 6 to form a first suction chamber A and a first compression chamber B. The inner wall of the inner cylinder 6 is tangent to the outer wall of the inner cylinder body 43 to form a second suction chamber a and a second compression chamber b. The inner cylinder 6 and the outer cylinder 4 are also provided with air flow channels respectively connecting the first suction chamber A, the first compression chamber B, the second suction chamber a and the second compression chamber b.

[0046] Please refer again Figure 2 and Figure 3 The main body of the pump assembly 20 and the main body of the motor assembly 10 are arranged at the same height in the axial direction. That is, the outer stator 2, the inner rotor 3, the outer cylinder 4 and the inner cylinder 6 are arranged at approximately the same height in the axial direction.

[0047] In this embodiment, the pump assembly 20 is embedded in the motor assembly 10, and the two are arranged at the same height, thereby reducing the overall height, which is conducive to the miniaturization design of the whole machine, and is particularly suitable for some scenes with limited height. It avoids the problem that the existing motor and pump body are separated and connected by a rotating shaft, which causes the crankshaft deflection to increase, thereby limiting the high-speed rotation of the compressor.

[0048] For details, please refer to Figure 5 , Figure 8 and Fig. 9 The side wall of the inner cylinder 6 is provided with a cylindrical hole 62 which penetrates inside and outside the cylinder body, and a sliding shaft 5 is provided in the cylindrical hole 62. The outer cylinder body 41 and the inner cylinder body 43 are connected by a cylinder slide 42 which radially extends from the inner wall of the outer cylinder body 41, and the cylinder slide 42 is passed through the sliding shaft 5.

[0049] The cylindrical hole 62 is a through groove that penetrates the inside and outside of the inner cylinder 6, and the inner hole wall 621 of the cylindrical hole 62 is a cylindrical surface, so that the sliding shaft 5 can be limitedly rotated in the cylindrical hole 62. Since 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 two are not coaxial and have the same speed, so the cylinder slide 42 between the inner cylinder body 43 and the outer cylinder body 41 and the sliding shaft 5 are movably connected.

[0050] like Figure 5 As shown, in this state, the outer wall of the inner cylinder 6 is tangent to the inner wall of the outer cylinder body 41, and in the axial space, the space formed between the inner cylinder 6 and the outer cylinder body 41 is divided into the first suction chamber A and the first compression chamber B by the cylinder slide 42. Similarly, the outer wall of the inner cylinder body 43 is tangent to the inner wall of the inner cylinder 6, so the axial space between the two is divided into the second suction chamber a and the second compression chamber b by the cylinder slide 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 all formed by the axial space formed by the tangent position of the outer cylinder 4 and the inner cylinder 6, which is again divided into two spaces by the cylinder slide 42.

[0051] In order to maximize the use of the internal cavity space of the pump body assembly 20 , the cylinder slide plate 42 extends radially and its axial height is close to the axial height of the outer cylinder 4 .

[0052] The sliding shaft 5 includes a first slider 51 and a second slider 51, the first slider 51 and the second slider 51 are arranged opposite to each other, and a through hole 52 is formed therebetween. The opposite surfaces of the first slider 51 and the second slider 51 are both cylindrical surfaces, and the cylindrical surfaces fit the cylindrical holes 621. The cylinder slide 42 is penetrated through the through hole 52. When the outer cylinder 4 drives the inner cylinder 6 to rotate, the sliding shaft 5 as a whole can rotate in the cylindrical holes 62, but will not fall out of the cylindrical holes 62. The cylinder slide 42 is located in the through hole 52 formed by the first slider 51 and the second slider 51, so a certain movable space is reserved between the cylinder slide 42 and the sliding shaft 5.

[0053] Specifically, Figure 5 As shown, the air flow channel includes a first air intake port 71 and a first air exhaust port 72 opened on the lower flange 7, a second air intake port 61 opened on the side wall of the inner cylinder 6, and a second air exhaust port 44 opened on the outer cylinder 4. The air intake and exhaust paths of the above-mentioned exhaust ports and air intake ports and the gas intake, compression and exhaust processes are described in detail in detail. Figures 13 to 16 , which will be described in detail below.

[0054] The first exhaust port 72 and the second exhaust port 44 are both provided with exhaust valves, and the exhaust valves are controlled to open and close according to corresponding working states.

[0055] Please refer again Fig.17 , which is a second embodiment of the motor external pump body structure 100. In this embodiment, the inner rotor 3 and the outer cylinder 4 are an integrally formed structure 30, and the inner rotor and the outer cylinder of the integrally formed structure 30 are provided with a cylinder cavity for embedding the inner cylinder 6 and a magnetic steel slot 303. Among them, the outer tube 301 is equivalent to the combined structure of the inner rotor 3 and the outer cylinder 4 mentioned above, and the inner cylinder body 302 is equivalent to the structure of the inner cylinder body 43 of the above embodiment in structure and function. The assembly method with the inner cylinder 6 is the same as that of the above embodiment, which will not be repeated here. The outer stator 2 is sleeved on the outside of the outer tube 301. Magnets are embedded in the magnetic steel slot 303 to form a rotor functional unit.

[0056] In the second embodiment, since the inner rotor 3 and the outer cylinder 4 are designed as an integrally formed structure 30, the structure is simpler, less material is used, the cost is lower, and the rotational friction between the inner rotor 3 and the outer cylinder 4 can be reduced.

[0057] In the second embodiment, the working principle of the motor external pump body structure is the same as that of the above embodiments.

[0058] Please refer again Figures 1 to 5The top of the motor assembly 10 is also provided with an upper flange 1, the bottom of the motor assembly 10 is also provided with a lower flange 7, the top of the outer cylinder 4 is provided with a protruding shaft 45, the lower flange 7 is provided with a mounting groove 73, the shaft 45 is rotatably connected to the upper flange 1, and the lower end of the inner cylinder 6 is plugged into the mounting groove 73. Among them, the upper flange 1, the lower flange 7 and the outer part of the outer stator 2 are connected and fixed to an outer shell (not shown in the figure), and the outer shell is used to provide assembly support for the outer stator 2, the upper flange 1 and the lower flange 7.

[0059] Furthermore, the upper flange 1 is coaxially arranged with the motor assembly 10 , and a shaft connection hole 11 is provided in the middle of the upper flange 1 , and the rotating shaft 45 is passed through the shaft connection hole 11 .

[0060] The outer cylinder 4 is rotatably connected to the shaft connection hole 11 on the upper flange 1 through the rotating shaft 45 connected thereto, and the lower end of the inner cylinder 6 is rotatably connected through the mounting groove 73 of the lower flange 7 assembled thereto, and the lower flange 7 and the upper flange 1 are both fixedly connected to the same outer shell, so that the motor assembly 10 as a whole can drive the pump body assembly 20, and its operation is stable and reliable.

[0061] An embodiment of the present invention further provides a compressor, which includes the motor-external pump body structure as described above.

[0062] In the motor-external pump body structure of this embodiment and the compressor having the same, the motor assembly and the pump body assembly are at the same height, which greatly reduces the height of the whole machine. The pump body structure uses an eccentrically mounted inner cylinder to realize the volume change during the rotation process, which can realize the suction and exhaust process, fully utilize the volume inside the outer cylinder, increase the suction and exhaust volume in a limited space, increase the compressor displacement, and is conducive to the miniaturization of the compressor. The whole machine does not need a balancing block, which can reduce vibration, and the height of the motor and the pump body can mostly overlap, and there is no need for a long shaft, so there is no problem of large crankshaft deflection, and the high speed of the compressor will not be limited by the increase in crankshaft deflection due to high speed. The pump body of this structure is not limited by the speed. Increasing the volume utilization rate of the compressor and increasing the displacement in a limited space is conducive to the miniaturization of the compressor. It is especially suitable for scenes with limited height, and can reduce the weight of the compressor and reduce costs.

[0063] Please refer again Figures 13 to 16 The working process of the motor external pump body structure 100 is briefly described below:

[0064] A schematic diagram of a compression process according to an embodiment of the present invention, Fig.13When the first compression chamber B is in the position, the volume of the first suction chamber A is zero, and the first suction chamber A reaches the maximum, which is in the state of just completing the suction and exhaust of the previous cycle. The inner cylinder 6 is divided into the second suction chamber a and the second compression chamber b, which are in the state of suction and compression of a cycle. The second suction chamber a of the inner cylinder 6 inhales air from the first suction chamber A of the outer cylinder 4 through the second suction port 61. Fig.13 Rotate to Fig.14 During the process, in the outer cylinder 4, the first suction chamber A of the previous cycle becomes the first compression chamber B, compresses the gas, and forms the first suction chamber A of this cycle, starts the suction of this cycle, and inhales from the first suction port 71. The second suction chamber a of the inner cylinder 6 inhales from the first suction chamber A of the outer cylinder through the suction port 61. The second compression chamber b compresses the gas and exhausts it after reaching the exhaust pressure, and exhausts it from the exhaust port 44. Fig.14 Rotate to Fig.15 When the first suction chamber A of the outer cylinder continues to inhale, the first compression chamber B continues to compress, and the second compression chamber b of the inner cylinder 6 completes exhaust and finally the volume is zero, completing a cycle of suction and exhaust, and the volume of the second suction chamber a reaches the maximum. Fig.15 Rotate to Fig.16 When the first suction chamber A of the outer cylinder 4 continues to inhale, the first compression chamber B continues to compress, and exhausts after reaching the exhaust pressure, exhausting from the exhaust port 72. The inner cylinder 6 re-forms the second suction chamber a of the next cycle, and transforms the second suction chamber a of the previous cycle into the second compression chamber b, compressing the gas inhaled in the previous cycle. The suction and exhaust process of the outer cylinder 4 is as follows: Figure 13 to Figure 14 to Figure 15 to Figure 16 , the intake and exhaust process of inner cylinder 6 is Figure 15 to Figure 16 to Figure 13 to Figure 14 .

[0065] The above examples are only used to further illustrate the technical content of the present invention, so that readers can understand it more easily, but they do not mean that the implementation of the present invention is limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A motor external pump body structure, characterized in that: include: A motor assembly and a pump assembly sleeved in the motor assembly; The motor assembly comprises: an outer stator, and an inner rotor coaxially sleeved inside the outer stator; The pump assembly comprises: an outer cylinder, an inner cylinder eccentrically embedded in the outer cylinder, the outer cylinder being fixedly connected to the inner rotor, and the outer cylinder synchronously drives the inner cylinder to rotate; In which, the outer cylinder has an inner cylinder body and an outer cylinder body arranged coaxially, the inner wall of the outer cylinder body is tangent to the outer wall of the inner cylinder to form a first suction chamber and a first compression chamber, the inner wall of the inner cylinder is tangent to the outer wall of the inner cylinder body to form a second suction chamber and a second compression chamber, and the motor assembly and the pump body assembly are also provided with air flow channels respectively connecting the first suction chamber, the first compression chamber, the second suction chamber and the second compression chamber.

2. The motor external pump body structure according to claim 1, characterized in that: The main body of the pump assembly and the main body of the motor assembly are arranged at the same height in the axial direction.

3. The motor external pump body structure according to claim 1, characterized in that: The side wall of the inner cylinder is provided with a penetrating cylindrical hole, a sliding shaft is provided in the cylindrical hole, the outer cylinder body and the inner cylinder body are connected by a cylinder sliding plate radially extending from the inner wall of the outer cylinder body, and the cylinder sliding plate is passed through the sliding shaft.

4. The motor external pump body structure according to claim 3, characterized in that: The sliding shaft includes a first slider and a second slider, the first slider and the second slider are arranged opposite to each other, and a through hole is formed therebetween. The opposite back surfaces of the first slider and the second slider are both cylindrical surfaces, the cylindrical surfaces are fitted with the cylindrical hole, and the cylinder slide is penetrated through the through hole.

5. The motor external pump body structure according to claim 1, characterized in that: The inner rotor and the outer cylinder are an integrally formed structure, and a cylinder cavity for embedding the inner cylinder and a magnetic steel groove for assembling the magnet are provided inside the integrally formed inner rotor and the outer cylinder.

6. The motor external pump body structure according to any one of claims 1 to 5, characterized in that: The top of the motor assembly is also provided with an upper flange, the bottom of the motor assembly is also 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 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, characterized in that: The air flow channel includes a first air intake port and a first air exhaust port opened on the lower flange, a second air intake port opened on the side wall of the inner cylinder, and a second air exhaust port opened on the outer cylinder.

8. The motor external pump body structure according to claim 7, characterized in that: An exhaust valve is disposed in each of the first exhaust port and the second exhaust port.

9. The motor external pump body structure according to claim 8, characterized in that: The upper flange is coaxially arranged with the motor assembly, a shaft connection hole is arranged in the middle of the upper flange, and the rotating shaft passes through the shaft connection hole.

10. A compressor, characterized in that: The compressor comprises a motor-external pump body structure as described in any one of claims 1 to 9.

Images