Axial flow type electronic pump

Abstract

The utility model discloses an axial-flow type electronic pump which comprises a pump shell, a first end cover and a second end cover, the pump shell comprises a main shell with a hollow containing cavity, the first end cover is connected with one side opening end of the main shell, and the second end cover is connected with the other side opening end of the main shell; wherein a liquid inlet channel is formed in the first end cover, and a liquid discharge channel is formed in the second end cover; the shielding isolation sleeve is arranged in the hollow containing cavity and is in sealing fit with the first end cover and the second end cover at the same time to form a liquid guide cavity communicating with the liquid inlet channel and the liquid drainage channel; the rotor assembly comprises a rotor shaft arranged in the liquid guide cavity, a magnetic ring arranged on the rotor shaft in a sleeving mode and an impeller arranged on the rotor shaft and located on the side, facing the first end cover, of the magnetic ring. Wherein a flow guide channel suitable for liquid circulation is formed in the magnetic ring.

Description

Technical Field

[0001] This utility model relates to the field of pumps, and in particular to an axial flow electronic pump. Background Technology

[0002] Axial flow pumps are frequently used for drainage, farmland irrigation, and the transport of liquids for river regulation. In existing axial flow pumps, the fluid delivery unit and the motor are typically separate units, with the fluid delivery unit's shaft connected to the motor's shaft via a coupling (the pump shaft extends outside the pipe, and the motor shaft extends beyond the end cover). Further research has revealed the following problems with this type of axial flow pump:

[0003] First, designing the fluid section and the power motor as separate structures inevitably results in a larger overall pump volume, which cannot meet the needs of axial flow pumps with limited installation space.

[0004] Secondly, the fluid section and the drive motor of the axial flow pump are driven by a coupling. Precise positioning of the shafts of the fluid section and the drive motor is essential for the normal operation of the axial flow pump. Furthermore, the lifespan of the coupling, the main connecting component, directly affects the lifespan of the axial flow pump.

[0005] Furthermore, mechanical seals are required between the fluid components and the power motor, but these seals have a short lifespan and cannot guarantee zero leakage.

[0006] Based on the above, for example, CN117869321A discloses a shielded permanent magnet high-speed motor driven multistage pump, which includes a suction chamber, a pump body shell, and a discharge chamber connected in sequence. A motor assembly is housed inside the pump body shell, and the motor assembly includes a motor housing and a rotor shaft rotatably connected within the pump body shell. Compared to split-type fluid sections and axial flow pumps with power motors, this structure eliminates the use of couplings, but the overall simplification is still lacking. Specifically, the motor assembly needs to be separated from the liquid flow chamber through the motor housing. Therefore, sealing is required not only between the suction chamber and the pump body shell, but also between the rotor shaft and the motor housing and the shielding sleeve. These multiple sealing processes increase the complexity of the overall structure and the difficulty of the manufacturing process.

[0007] Based on the above, and in order to further simplify the overall structure of the axial flow pump, it is necessary to further optimize and improve the structure of the axial flow pump. Utility Model Content

[0008] The purpose of this invention is to provide an axial flow electronic pump to solve the technical problem of simplifying its overall structure.

[0009] The axial flow electronic pump of this invention is implemented as follows:

[0010] An axial flow electric pump, comprising:

[0011] The pump housing includes a main housing having a hollow receiving cavity, a first end cap connected to one side opening of the main housing, and a second end cap connected to the other side opening of the main housing; wherein the first end cap has an inlet channel and the second end cap has a drain channel.

[0012] A shielding and isolation sleeve is disposed in a hollow accommodating cavity and simultaneously seals with the first end cap and the second end cap to form a liquid guiding cavity that connects the liquid inlet channel and the liquid outlet channel;

[0013] The rotor assembly includes a rotor shaft disposed within a liquid guiding cavity, a magnetic ring mounted on the rotor shaft, and an impeller disposed on the rotor shaft and located on the side of the magnetic ring facing the first end cover; wherein the magnetic ring has a guide channel formed to facilitate liquid flow.

[0014] In an optional embodiment of this invention, the magnetic ring includes an annular main body and a shaft mating portion disposed within the annular main body, suitable for the rotor shaft to pass through; wherein

[0015] The guide channel is formed between the inner wall of the magnetic ring and the shaft mating part.

[0016] In an optional embodiment of this utility model, the impeller includes a hub connected to the rotor shaft and at least three blades spaced apart along the circumferential direction on the outer wall of the hub.

[0017] In an optional embodiment of this invention, at least two guide vanes are provided at intervals along the circumferential direction in the guide channel, which are suitable for converting the rotational motion of the liquid flowing into the guide channel through the impeller into axial motion.

[0018] In an optional embodiment of this utility model, the first end cap includes a first main body with a liquid inlet channel, a first axial extension portion located at one end of the first main body and adapted for insertion of a shielding sleeve portion, and a first radial extension portion located circumferentially outside the first axial extension portion and for contacting the main housing; and

[0019] The second end cap includes a second main body with a drainage channel, a second axial extension at both ends of the second main body and adapted to partially extend into the shielding sleeve, and a second radial extension on the circumferentially outer side of the second axial extension for contacting the main housing.

[0020] In an optional embodiment of this utility model, first sealing rings are provided between the first axial extension and the shielding sleeve, and between the first radial extension and the main housing; and

[0021] A second sealing ring is provided between the second axial extension and the shielding sleeve, and between the second radial extension and the main housing.

[0022] In an optional embodiment of this utility model, the shielding sleeve includes a main sleeve for accommodating the magnetic ring, an expanded diameter section located at one axial end of the main sleeve, and a reduced diameter section located at the other axial end of the main sleeve; wherein

[0023] The outer diameter of the enlarged section is larger than the outer diameter of the main sleeve, and the second axial extension is adapted to partially extend into the enlarged section; and

[0024] The outer diameter of the reduced diameter section is smaller than the outer diameter of the main sleeve, and the reduced diameter section is adapted to be inserted into the first axial extension.

[0025] In an optional embodiment of this utility model, a narrowing section with an inner diameter smaller than that of the main sleeve is further provided between the main sleeve and the reduced diameter section.

[0026] The impeller is located within the narrowing section.

[0027] In an optional embodiment of this utility model, an annular boss with an outer diameter larger than the outer diameters of both the narrowing section and the diameter-reducing section is provided between the narrowing section and the diameter-reducing section; and

[0028] The inner wall of the first axial extension is provided with a first stepped surface suitable for contacting the annular boss and a second stepped surface that is in close contact with the reduced diameter section through the first sealing ring.

[0029] In an optional embodiment of this utility model, the outer wall of the second axial extension is provided with a third stepped surface that axially abuts against the enlarged diameter section, and the enlarged diameter section is provided with an abutting platform that abuts against the third stepped surface.

[0030] In an optional embodiment of this utility model, the first main body further includes a first support portion for supporting one axial end of the rotor shaft; and

[0031] The second main body also has a second support portion inside for supporting the other shaft end of the rotor shaft;

[0032] The two shaft ends of the rotor shaft are respectively connected to the first support and the second support via bearings.

[0033] In an optional embodiment of this utility model, an annular receiving area is formed between the outer wall of the magnetic ring and the cavity wall of the hollow receiving cavity;

[0034] An iron core is provided in the annular accommodating section.

[0035] By adopting the above technical solution, this utility model has the following beneficial effects: The axial flow electronic pump of this utility model, by forming a liquid guiding cavity inside the shielding isolation sleeve, can simplify the structure and directly and effectively reduce the volume of the overall axial flow electronic pump, while saving production costs; on the other hand, the overall axial flow electronic pump uses a single pump housing for both the power part and the fluid part, thus reducing the use of the housing compared to the prior art, thereby reducing the design of the sealing structure, thereby reducing the processing difficulty, and the reduction of the sealing structure can also reduce the risk caused by seal failure, thereby improving the overall sealing performance of the axial flow electronic pump of this utility model. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the axial flow electronic pump of this utility model;

[0037] Figure 2 This is a schematic diagram of the magnetic ring structure of the axial flow electronic pump of this utility model;

[0038] Figure 3 This is a schematic diagram of the impeller structure of the axial flow electronic pump of this utility model;

[0039] Figure 4 This is a schematic diagram of the mating structure of the rotor shaft, magnetic ring, and impeller of the axial flow electronic pump of this utility model.

[0040] Figure 5 This is a first-view structural schematic diagram of the shielding and isolation sleeve of the axial flow electronic pump of this utility model.

[0041] Figure 6 This is a second-view structural schematic diagram of the shielding and isolation sleeve of the axial flow electronic pump of this utility model;

[0042] Figure 7 This is a schematic diagram of the structure of the first end cover of the axial flow electronic pump of this utility model;

[0043] Figure 8 This is a schematic diagram of the structure of the second end cover of the axial flow electronic pump of this utility model.

[0044] In the figure: pump housing 1, hollow receiving cavity 11, annular receiving section 12, shielding isolation sleeve 2, liquid guiding cavity 21, main sleeve 23, expansion section 24, reduction section 25, narrowing section 26, annular boss 27, abutment platform 28, first end cover 3, liquid inlet channel 31, liquid inlet 32, first main body 33, first axial extension 34, first radial extension 35, first support 36, first stepped surface 37, second stepped surface 38, second end cover 4, liquid discharge channel 41, liquid discharge port 42, second main body 43, second axial extension 44, second radial extension 45, second support 46, third stepped surface 47, rotor shaft 5, magnetic ring 6, annular main body 61, shaft mating part 62, guide vane 63, hub 71, blade 72, iron core 8, bearing 9, first sealing ring 101, second sealing ring 102. Detailed Implementation

[0045] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0046] Example 1:

[0047] Please see Figures 1 to 8 As shown, this embodiment provides an axial flow electronic pump, including: a pump housing 1, a shielding sleeve 2 disposed within the pump housing 1, and a rotor assembly disposed within the shielding sleeve 2.

[0048] Specifically, the first part is the pump housing 1, which includes a main housing with a hollow cavity 11. Both sides of the main housing along the depth direction of the hollow cavity 11 are openings communicating with the cavity 11. Based on this, a first end cap 3 is connected to one side opening of the main housing, and a second end cap 4 is connected to the other side opening. Thus, the first end cap 3 and the second end cap 4 form a seal over the two side openings of the main housing, thereby creating a relatively sealed space within the hollow cavity 11 of the main housing.

[0049] The first end cap 3 has a liquid inlet channel 31, and the second end cap 4 has a liquid outlet channel 41. It is understood that the first end cap 3 has a liquid inlet 32 ​​communicating with the liquid inlet channel 31, preferably located at the end of the first end cap 3 relatively far from the main housing. Similarly, the second end cap 4 has a liquid outlet 42 communicating with the liquid outlet channel 41, preferably located at the end of the second end cap 4 relatively far from the main housing. In the case where both the liquid inlet 32 ​​and the liquid outlet 42 are circular, the inner diameter of the liquid inlet 32 ​​and the liquid outlet 42 is not absolutely limited in this embodiment. Optionally, the inner diameter of the liquid outlet 42 is slightly larger than the inner diameter of the liquid inlet 32 ​​to improve the liquid drainage speed.

[0050] Furthermore, the shielding sleeve 2 is located in the hollow accommodating cavity 11 and simultaneously seals with the first end cap 3 and the second end cap 4 to form a liquid guiding cavity 21 that connects the liquid inlet channel 31 and the liquid outlet channel 41. Based on this, it means that after entering the liquid inlet channel 31 from the liquid inlet 32, the liquid flows into the liquid guiding cavity 21 and then exits from the liquid outlet 42 through the liquid outlet channel 41.

[0051] Next is the rotor assembly, which includes a rotor shaft 5 disposed within the liquid guiding cavity 21, a magnetic ring 6 mounted on the rotor shaft 5, and an impeller disposed on the rotor shaft 5 and located on the side of the magnetic ring 6 facing the first end cover 3; wherein the magnetic ring 6 has a guide channel suitable for liquid flow. The impeller includes a hub 71 connected to the rotor shaft 5 and at least three blades 72 disposed on the outer wall of the hub 71 and spaced apart in the circumferential direction, wherein the blades 72 may be airfoil-shaped. An annular receiving section 12 is formed between the outer wall of the magnetic ring 6 and the cavity wall of the hollow receiving cavity 11; an iron core 8 is disposed in the annular receiving section 12.

[0052] Based on the above structure, and referring to the accompanying drawings, in an optional embodiment, the magnetic ring 6 includes an annular main body 61 and a shaft mating portion 62 disposed within the annular main body 61, suitable for the rotor shaft 5 to pass through; wherein a guide channel is formed between the inner wall of the magnetic ring 6 and the shaft mating portion 62. At least two guide vanes 63 are spaced apart along the circumferential direction within the guide channel, suitable for converting the rotational motion of the liquid flowing into the guide channel via the impeller into axial motion. It should be noted that in this embodiment, the impeller's function is to convert mechanical energy into the pressure energy and kinetic energy of the fluid, while the guide vanes 63's function is to convert the rotational motion of the liquid flowing out of the impeller into axial motion, and simultaneously convert some of the kinetic energy into pressure energy. In this regard, it is also necessary to explain that, in this embodiment, the guide vane 63 is connected to both the inner wall of the annular main body 61 and the outer wall of the shaft mating part 62. From the axial dimension of the annular main body 61, optionally, firstly, the mating surface formed by the guide vane 63 and the shaft mating part 62 is arranged at an angle relative to the axial direction of the shaft mating part 62; secondly, the mating surface formed by the guide vane 63 and the shaft mating part 62 extends from one axial end of the shaft mating part 62 to the other axial end. Based on this, for multiple guide vanes 63, the mating surfaces formed by the multiple guide vanes 63 and the shaft mating part 62 have the same inclination direction relative to the axial direction of the shaft mating part 62, thus preventing adjacent guide vanes 63 from interfering with each other. Optionally, the mating surface formed by each guide vane 63 and the shaft mating part 62 has the same inclination angle relative to the shaft mating part 62, thereby forming a uniformly distributed structure of multiple guide vanes 63 relative to the shaft mating part 62, thereby improving the stability of the magnetic ring 6 during use.

[0053] Based on the above, a guide vane 63 is provided in the space between the annular main body 61 and the shaft mating part 62, saving installation space for the guide vane 63 and thus reducing the overall volume of the axial flow electric pump. Alternatively, in one implementation, the magnetic ring 6 is injection molded, with the guide vane 63, annular main body 61, and shaft mating part 62 integrally injection molded. This increases the structural stability of the guide vane 63, eliminates assembly costs, and after molding, only the annular main body 61 in the magnetic ring 6 is magnetized; the guide vane 63 is not magnetized.

[0054] Next, it should be noted that in this embodiment, the first end cap 3 needs to simultaneously seal and cooperate with the main housing and the shielding isolation sleeve 2, and the second end cap 4 needs to simultaneously seal and cooperate with the main housing and the shielding isolation sleeve 2. Therefore, this embodiment has the following design:

[0055] In general, the first end cap 3 includes a first main body 33 with a liquid inlet channel 31, a first axial extension 34 located at one end of the first main body 33 and adapted to partially insert into the shielding sleeve 2, and a first radial extension 35 located circumferentially outside the first axial extension 34 for contacting the main housing. The second end cap 4 includes a second main body 43 with a liquid outlet channel 41, second axial extensions 44 located at both ends of the second main body 43 and adapted to partially extend into the shielding sleeve 2, and a second radial extension 45 located circumferentially outside the second axial extension 44 for contacting the main housing.

[0056] Based on the above structure, it should be noted that the first main body 33 is further provided with a first support portion 36 for supporting one axial end of the rotor shaft 5; and the second main body 43 is further provided with a second support portion 46 for supporting the other axial end of the rotor shaft 5; the two axial ends of the rotor shaft 5 are respectively connected to the first support portion 36 and the second support portion 46 via bearings 9. The design of the first support portion 36 does not create an obstruction to the liquid inlet channel 31, and similarly, the design of the second support portion 46 does not create an obstruction to the liquid outlet channel 41.

[0057] Based on the above, more specifically, a first sealing ring 101 is provided between the first axial extension 34 and the shielding sleeve 2 and between the first radial extension 35 and the main housing; and a second sealing ring 102 is provided between the second axial extension 44 and the shielding sleeve 2 and between the second radial extension 45 and the main housing.

[0058] In summary, for the axial flow electronic pump of this embodiment, after startup, the rotor assembly begins to rotate, driving the impeller and guide vane 63 to rotate as well. Liquid is drawn into the inlet 32 ​​by the rotating impeller, and the guide vane 63 converts the rotational motion of the liquid exiting the impeller into axial motion, simultaneously converting some kinetic energy into pressure energy. During impeller rotation, the kinetic energy of the liquid gradually increases, and when a certain pressure is reached, it is discharged from the outlet. By forming a liquid guiding cavity 21 within the shielding sleeve 2, the structure can be simplified to directly and effectively reduce the overall volume of the axial flow electronic pump, while saving production costs. Furthermore, the overall axial flow electronic pump shares a single pump housing 1 for both the power and fluid components, thus reducing the use of the housing compared to existing technologies. This reduces the design of sealing structures, thereby lowering processing difficulty. The reduction in sealing structures also reduces the risk of seal failure, thereby improving the overall sealing performance of the axial flow electronic pump of this invention.

[0059] Example 2:

[0060] Please see Figures 1 to 8 As shown, based on the axial flow electric pump of Example 1, the axial flow electric pump provided in this example...

[0061] In order to ensure that the shielding sleeve 2 can form a reliable seal between the first end cap 3 and the second end cap 4, the following design is also made in this embodiment:

[0062] The shielding sleeve 2 includes a main sleeve 23 for accommodating the magnetic ring 6, an expanded diameter section 24 located at one axial end of the main sleeve 23, and a reduced diameter section 25 located at the other axial end of the main sleeve 23. Taking the main sleeve 23, expanded diameter section 24, and reduced diameter section 25, all of which are generally cylindrical, as an example, the outer diameter of the expanded diameter section 24 is larger than the outer diameter of the main sleeve 23, and the second axial extension 44 is adapted to partially extend into the expanded diameter section 24; and the outer diameter of the reduced diameter section 25 is smaller than the outer diameter of the main sleeve 23, and the reduced diameter section 25 is adapted to be inserted into the first axial extension 34.

[0063] Based on the above structure, this embodiment also provides a narrowing section 26 with an inner diameter smaller than that of the main sleeve 23 between the main sleeve 23 and the reduced diameter section 25; the impeller is located within the narrowing section 26. This design allows the narrowing section 26 to be used to ensure that the impeller can fully agitate the liquid, thereby ensuring the power of liquid flow.

[0064] Furthermore, it should be noted that this embodiment also includes the following improvements: an annular boss 27 with an outer diameter larger than both the narrowing section 26 and the reduced diameter section 25 is provided between the narrowing section 26 and the reduced diameter section 25; and the inner wall of the first axial extension 34 is provided with a first stepped surface 37 suitable for contacting the annular boss 27 and a second stepped surface 38 that is in close contact with the reduced diameter section 25 through the first sealing ring 101. Here, the annular boss 27, in conjunction with the second stepped surface 38, can form an axial limit on the first sealing ring 101 between the first end cap 3 and the shielding sleeve 2, preventing the first sealing ring 101 from detaching from the first end cap 3. Moreover, considering that the first sealing ring 101 can be easily fitted onto the outer wall of the reduced diameter section 25, an inwardly tapering chamfer K is designed at the end of the reduced diameter section 25 facing away from the annular boss 27.

[0065] Furthermore, the outer wall of the second axial extension 44 is provided with a third stepped surface 47 that axially abuts against the enlarged diameter section 24, and the enlarged diameter section 24 is provided with an abutting platform 28 that abuts against the third stepped surface 47. Here, the cooperation between the abutting platform 28 and the third stepped surface 47 can limit the axial end of the shielding isolation sleeve 2 on the side of the second end cover 4.

[0066] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0067] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0068] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0069] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0070] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0071] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. An axial flow electronic pump, characterized in that, include: The pump housing includes a main housing having a hollow receiving cavity, a first end cap connected to one side opening of the main housing, and a second end cap connected to the other side opening of the main housing. The first end cap has a liquid inlet channel, and the second end cap has a liquid outlet channel. A shielding and isolation sleeve is disposed in a hollow accommodating cavity and simultaneously seals with the first end cap and the second end cap to form a liquid guiding cavity that connects the liquid inlet channel and the liquid outlet channel; The rotor assembly includes a rotor shaft disposed within a liquid guiding cavity, a magnetic ring mounted on the rotor shaft, and an impeller disposed on the rotor shaft and located on the side of the magnetic ring facing the first end cover; wherein the magnetic ring has a guide channel formed to facilitate liquid flow.

2. The axial flow electronic pump according to claim 1, characterized in that, The magnetic ring includes an annular main body and a shaft mating part disposed within the annular main body, suitable for the rotor shaft to pass through; in The guide channel is formed between the inner wall of the magnetic ring and the shaft mating part.

3. The axial flow electronic pump according to claim 1 or 2, characterized in that, The impeller includes a hub connected to the rotor shaft and at least three blades spaced apart along the circumferential direction on the outer wall of the hub.

4. The axial flow electronic pump according to claim 3, characterized in that, At least two guide vanes are arranged at intervals along the circumferential direction in the guide channel, which are suitable for converting the rotational motion of the liquid flowing into the guide channel through the impeller into axial motion.

5. The axial flow electronic pump according to claim 1, characterized in that, The first end cap includes a first main body with a liquid inlet channel, a first axial extension portion located at one end of the first main body and adapted for insertion of a shielding sleeve portion, and a first radial extension portion located circumferentially outside the first axial extension portion and for contacting the main housing; and The second end cap includes a second main body with a drainage channel, a second axial extension at both ends of the second main body and adapted to partially extend into the shielding sleeve, and a second radial extension on the circumferentially outer side of the second axial extension for contacting the main housing.

6. The axial flow electronic pump according to claim 5, characterized in that, First sealing rings are provided between the first axial extension and the shielding sleeve, and between the first radial extension and the main housing; and A second sealing ring is provided between the second axial extension and the shielding sleeve, and between the second radial extension and the main housing.

7. The axial flow electronic pump according to claim 5 or 6, characterized in that, The shielding sleeve includes a main sleeve for accommodating the magnetic ring, an expanded diameter section located at one axial end of the main sleeve, and a reduced diameter section located at the other axial end of the main sleeve; wherein The outer diameter of the enlarged section is larger than the outer diameter of the main sleeve, and the second axial extension is adapted to partially extend into the enlarged section; and The outer diameter of the reduced diameter section is smaller than the outer diameter of the main sleeve, and the reduced diameter section is adapted to be inserted into the first axial extension.

8. The axial flow electronic pump according to claim 7, characterized in that, A narrowing section with an inner diameter smaller than that of the main sleeve is also provided between the main sleeve and the reducing section. The impeller is located within the narrowing section.

9. The axial flow electronic pump according to claim 8, characterized in that, An annular boss, with an outer diameter larger than that of both the narrowing and reducing sections, is provided between the narrowing section and the diameter-reducing section; and The inner wall of the first axial extension is provided with a first stepped surface suitable for contacting the annular boss and a second stepped surface that is in close contact with the reduced diameter section through the first sealing ring.

10. The axial flow electronic pump according to claim 7, characterized in that, The outer wall of the second axial extension is provided with a third stepped surface that axially abuts against the expanded diameter section, and the expanded diameter section is provided with an abutting platform that abuts against the third stepped surface.

11. The axial flow electric pump according to claim 5 or 6, characterized in that, The first main body component also has a first support portion inside for supporting one axial end of the rotor shaft; and The second main body also has a second support portion inside for supporting the other shaft end of the rotor shaft; The two shaft ends of the rotor shaft are respectively connected to the first support and the second support via bearings.

12. The axial flow electronic pump according to claim 1, characterized in that, An annular accommodating region is formed between the outer wall of the magnetic ring and the cavity wall of the hollow accommodating cavity; An iron core is provided in the annular accommodating section.

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