Impeller assembly and electronic liquid pump using same

Abstract

The utility model discloses an impeller assembly and an electronic liquid pump using the same, and the impeller assembly comprises a pump shell which comprises a lower shell and an upper shell cover which are matched to form an impeller accommodating cavity; a liquid inlet communicated with the impeller accommodating cavity is formed in the upper shell cover, and a liquid outlet communicated with the impeller accommodating cavity is formed in the lower shell; the flow channel module is fixed in the impeller accommodating cavity; the flow channel module comprises a liquid conveying unit and an annular connecting sleeve arranged on the outer layer of the liquid conveying unit. The liquid conveying unit comprises an impeller cover plate provided with a liquid inlet, an impeller bottom plate matched with the impeller cover plate to form a containing cavity and provided with a liquid outlet, and an impeller disc arranged in the containing cavity. The opposite side end faces of the impeller cover plate and the impeller bottom plate are each provided with a liquid flow channel. A plurality of channels penetrating through the two axial side ends of the impeller disc are distributed on the impeller disc in the circumferential direction. According to the electronic liquid pump, the problem that the service life of the electronic liquid pump is affected due to failure of liquid leakage prevention matching between the flow channel module and the cavity wall of the impeller containing cavity can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment, in particular to an impeller assembly and an electronic liquid pump using the impeller assembly. Background Art

[0002] The centrifugal impeller liquid pumps commonly used in the prior art are difficult to meet the high-lift scenarios without increasing the power. For example, in order to shorten the waiting time for electric vehicles to charge, the charging power of electric vehicles is increasing. The increase in charging power leads to a gradual increase in the carrying current of the charging gun line. The increase in carrying current places more stringent requirements on the heat dissipation of the charging gun line. Liquid cooling is an excellent heat dissipation method that can solve a large number of heat dissipation problems of the charging gun line. Liquid cooling is an excellent heat dissipation method that mainly relies on its core component, the electronic liquid pump, to achieve this.

[0003] Compared with the centrifugal impeller liquid pump, the corresponding head achieved by using the channel impeller is higher. For this reason, the channel impeller needs to be assembled in the pump housing, and in order to ensure the realization of the high head effect, the liquid entering the liquid pump needs to enter the flow channel of the channel impeller as much as possible. For this reason, it is necessary to form a reliable leak-proof liquid fit between the outer wall of the impeller and the inner wall of the pump housing, that is, the liquid entering the pump housing will not penetrate between the outer wall of the impeller and the inner wall of the pump housing. In order to achieve the above effect, the conventional leak-proof liquid fit method used in the prior art is to set the sealing ring between the outer wall of the impeller and the inner wall of the pump housing. Although the sealing ring method is low in cost, as the electronic liquid pump is used for a longer time, the sealing ring may age and may cause the leak-proof liquid fit to fail, thereby directly affecting the high head effect of the electronic liquid pump.

[0004] Therefore, the anti-leakage cooperation between the outer wall of the channel impeller and the inner wall of the pump housing needs to be further optimized to avoid the problem of affecting the high-lift effect of the electronic liquid pump due to the failure of the anti-leakage cooperation. Utility Model Content

[0005] The first object of the utility model is to provide an impeller assembly to solve the technical problem of optimizing the anti-leakage matching structure of the outer side wall thereof.

[0006] The second object of the utility model is to provide an electronic liquid pump to solve the technical problem of preventing the service life of the electronic liquid pump from being affected by the failure of the anti-leakage matching structure of the outer wall.

[0007] The impeller assembly of the utility model is realized in this way:

[0008] An impeller assembly, comprising:

[0009] The pump housing comprises a lower housing and an upper housing cover which cooperate to form an impeller accommodating chamber; the upper housing cover is provided with a liquid inlet communicating with the impeller accommodating chamber, and the lower housing is provided with a liquid outlet communicating with the impeller accommodating chamber;

[0010] A flow channel module is fixed in the impeller accommodating cavity; the flow channel module comprises a liquid delivery unit and an annular connecting sleeve arranged on the outer layer of the liquid delivery unit; the liquid delivery unit comprises an impeller cover plate provided with a liquid inlet, an impeller bottom plate adapted to form a receiving cavity with the impeller cover plate and provided with a liquid outlet, and an impeller disc arranged in the receiving cavity;

[0011] Liquid flow channels are respectively provided on the side end surfaces facing each other of the impeller cover plate and the impeller bottom plate; a plurality of channels penetrating the two axial ends of the impeller disk are distributed along the circumferential direction; and the liquid flow channels on the impeller cover plate and the impeller bottom plate are suitable for respectively cooperating with the impeller disk to form a complete and closed liquid flow cavity, which is simultaneously connected to the liquid inlet and the liquid outlet.

[0012] In an optional implementation of the present invention, the butt joint surfaces of the lower shell and the upper shell cover are suitable for being connected by welding.

[0013] In an optional implementation of the present invention, at least one L-shaped step surface is formed on the end surface of the lower shell for matching with the upper shell cover, and a corresponding L-shaped matching surface that is one-to-one compatible with the L-shaped step surface is formed on the upper shell cover.

[0014] In an optional implementation of the present invention, the flow channel module is suitable for being connected to the lower shell by injection molding as an insert.

[0015] In an optional implementation of the present invention, an L-shaped support platform is formed on the inner wall of the annular connecting sleeve; and an L-shaped overlapping surface suitable for being mounted on the L-shaped support platform is formed on the corresponding outer side wall of the impeller base plate.

[0016] In an optional implementation of the present invention, an annular L-shaped sink is formed on the outer circumferential wall surface of the axial side end of the impeller cover plate away from the impeller bottom plate; and

[0017] The axial side end of the annular connecting sleeve corresponding to the impeller cover plate is suitable for being at least partially riveted onto the L-shaped sinking platform.

[0018] In an optional implementation of the utility model, at least one set of corresponding and connected positioning grooves are provided on the outer circular wall surfaces of the impeller cover plate and the impeller base plate, and the positioning grooves are suitable for the positioning pin to pass through so that the positioning pin connects the impeller cover plate and the impeller base plate at the same time.

[0019] In an optional implementation of the present invention, the liquid flow channels on the impeller cover plate and the impeller bottom plate are both C-shaped annular flow channels coaxially arranged with the impeller disk; and

[0020] The C-shaped annular flow channels on the impeller cover plate and the impeller bottom plate have the same structure and are arranged in a corresponding manner.

[0021] In an optional implementation of the utility model, a plurality of blades with the same specifications and sizes are arranged at intervals on the impeller disk along the circumferential direction, and the channel is formed between every two adjacent blades.

[0022] The electronic liquid pump of the utility model is realized in this way:

[0023] An electronic liquid pump comprises: the impeller assembly as described above, and a motor unit connected to the impeller assembly;

[0024] The motor unit comprises at least a motor housing integrally formed with the base, and an output shaft with one end extending out of the motor housing; one end of the output shaft is suitable for penetrating the lower housing, the impeller bottom plate and the impeller disc and then being inserted into the impeller cover plate.

[0025] In an optional implementation of the utility model, a positioning hole suitable for inserting the end of the output shaft is preset in the impeller cover plate;

[0026] The positioning hole is provided with a thrust piece which abuts against the end of the output shaft.

[0027] By adopting the above technical scheme, the utility model has the following beneficial effects: the impeller assembly of the utility model and the electronic liquid pump using the same, the outer wall of the annular connection sleeve and the cavity wall of the impeller accommodating cavity form a leak-proof match, and the impeller cover plate and the impeller bottom plate are fixed in the annular connection sleeve with the impeller disc. Based on this structure, the overall flow channel module can be reliably fixed in the impeller accommodating cavity of the pump housing, and the structure of the annular connection sleeve is not easy to age and has a long service life compared to the traditional sealing ring. Therefore, even with the long-term use of the electronic liquid pump, the failure of the leak-proof matching structure will not cause the problem of affecting the service life of the electronic liquid pump. Based on this situation, a complete and closed flow channel is formed by respectively providing a liquid flow channel on the side end surfaces facing each other of the impeller cover plate and the impeller bottom plate, ensuring that most of the liquid is in the flow channel or in the impeller disc. After the liquid enters the impeller assembly from the liquid inlet, driven by the high-speed rotation of the impeller disc, it can be ensured that most of the liquid will accelerate along the flow channel and will not leak. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of the electronic liquid pump of the utility model;

[0029] Figure 2 This is a schematic diagram of the explosion decomposition structure of the electronic liquid pump of the utility model;

[0030] Figure 3It is a schematic diagram of the exploded structure of the impeller assembly of the electronic liquid pump of the utility model;

[0031] Figure 4 It is a schematic diagram of the overall structure of the flow channel module of the impeller assembly of the electronic liquid pump of the utility model;

[0032] Figure 5 It is a structural schematic diagram of the lower housing of the impeller assembly of the electronic liquid pump of the utility model;

[0033] Figure 6 It is a structural schematic diagram of the upper shell cover of the impeller assembly of the electronic liquid pump of the utility model;

[0034] Figure 7 It is a schematic diagram of the matching structure of the upper shell cover and the lower shell of the impeller assembly of the electronic liquid pump of the utility model;

[0035] Figure 8 It is a schematic diagram of the matching structure of the lower housing and the flow channel module of the impeller assembly of the electronic liquid pump of the utility model;

[0036] Fig. 9 It is a structural schematic diagram of the impeller base plate of the impeller assembly of the electronic liquid pump of the utility model;

[0037] Fig.10 It is a schematic structural diagram of an impeller cover plate of an impeller assembly of an electronic liquid pump of the utility model.

[0038] In the figure: lower shell 11, upper shell cover 12, liquid inlet 13, liquid discharge port 14, L-shaped step surface 15, L-shaped matching surface 16, annular connecting sleeve 2, L-shaped support platform 21, impeller cover plate 3, liquid inlet 31, L-shaped sinking platform 32, positioning hole 33, impeller bottom plate 4, liquid outlet 41, L-shaped overlapping surface 42, impeller disk 5, blades 51, channel 52, positioning groove 6, liquid flow channel 7, motor housing 81, output shaft 82, thrust piece 9. DETAILED DESCRIPTION

[0039] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0040] Embodiment 1:

[0041] See also Figures 1 to 10 As shown, this embodiment provides an impeller assembly, including: a pump housing and a flow channel module arranged in the pump housing.

[0042] Specifically, first is the pump housing, which includes a lower housing 11 and an upper housing cover 12 that cooperate to form an impeller accommodating chamber; the upper housing cover 12 is provided with a liquid inlet 13 connected to the impeller accommodating chamber, and the lower housing 11 is provided with a liquid outlet 14 connected to the impeller accommodating chamber.

[0043] In an optional implementation, the butt joint surfaces of the lower shell 11 and the upper shell cover 12 can be connected by ultrasonic welding. Considering that in order to improve the reliable positioning of the mating surfaces of the lower shell 11 and the upper shell cover 12 during the welding process, this embodiment also makes the following design:

[0044] At least one L-shaped step surface 15 is formed on the end surface of the lower shell 11 for matching the upper shell cover 12, and a corresponding L-shaped matching surface 16 that matches the L-shaped step surface 15 one-to-one is formed on the upper shell cover 12. Here, in conjunction with the accompanying drawings, this embodiment is designed with two L-shaped step surfaces 15 on the lower shell 11 and two L-shaped matching surfaces 16 on the upper shell. Under this structure, not only the reliability of the positioning and matching effects formed by the two is improved, but also the firmness of the welding structure formed by the two is improved. Based on this structure, a reliable fixed match is formed between the upper shell cover 12 and the lower shell 11, so that there is no need to use a sealing ring separately.

[0045] Next, the flow channel module is fixed in the impeller accommodating chamber; the flow channel module includes a liquid delivery unit and an annular connecting sleeve 2 arranged on the outer layer of the liquid delivery unit; the liquid delivery unit includes an impeller cover plate 3 provided with a liquid inlet 31, an impeller bottom plate 4 adapted to form a receiving chamber with the impeller cover plate 3 and provided with a liquid outlet 41, and an impeller disc 5 arranged in the receiving chamber. The impeller disc 5 operates in the receiving chamber. Here, leakage between the outer wall of the flow channel module and the inner wall of the impeller accommodating chamber is prevented to ensure that the maximum amount of liquid enters the impeller accommodating chamber and then directly enters the flow channel module, which is mainly achieved through the annular connecting sleeve 2.

[0046] Based on this structure, it should be noted that the present embodiment uses the annular connection sleeve 2 to fix the impeller cover plate 3, the impeller disc 5 and the impeller bottom plate 4 together to form an integral part, and the outer side walls of the impeller cover plate 3 and the impeller bottom plate 4 are tightly contained in the annular connection sleeve 2, so that the outer side walls of the impeller cover plate 3 and the impeller bottom plate 4 and the annular connection sleeve 2 form a reliable fit. Based on this situation, the liquid entering the impeller cover plate 3 can enter the impeller bottom plate 4 under the action of the impeller disc 5, and finally flow out of the impeller bottom plate 4. In this regard, in order to make the annular connection sleeve 2 meet the above-mentioned use requirements, this embodiment is described in detail in conjunction with the accompanying drawings:

[0047] Generally, the annular adapter sleeve 2 ensures a reliable fit between the annular adapter sleeve 2 and the impeller cover plate 3 and the impeller bottom plate 4 by forming an axial fixation for the impeller cover plate 3, the impeller disk 5 and the impeller bottom plate 4.

[0048] Specifically, along one axial end of the flow channel module, an inner wall of the annular adapter sleeve 2 is formed with an L-shaped support platform 21, and an outer side wall of the corresponding impeller bottom plate 4 is formed with an L-shaped overlap surface 42 suitable for being mounted on the L-shaped support platform 21. Here, the L-shaped support platform 21 and the L-shaped overlap surface 42 are both ring-shaped structures.

[0049] At the other axial end of the flow channel module, an annular L-shaped sink 32 is formed on the outer circumferential wall surface of the axial end of the impeller cover plate 3 away from the impeller bottom plate 4; and the axial end of the annular adapter sleeve 2 corresponding to the impeller cover plate 3 is suitable for at least partially riveting on the L-shaped sink 32. It should be noted that although the L-shaped sink 32 here is annular, for the annular adapter sleeve 2, only the points arranged at intervals can be selected to form the riveted fitting part, thereby reducing the difficulty of processing.

[0050] In addition, it is necessary to explain that at least one set of correspondingly connected positioning grooves 6 are provided on the outer circumferential wall surfaces of the impeller cover plate 3 and the impeller bottom plate 4, and the positioning grooves 6 are suitable for the positioning pin to penetrate so that the positioning pin simultaneously connects the impeller cover plate 3 and the impeller bottom plate 4. Here, the matching position of the impeller cover plate 3 and the impeller bottom plate 4 is identified and positioned by the matching positioning grooves 6 on the impeller cover plate 3 and the impeller bottom plate 4. This design is mainly to enable the liquid inlet 31 on the impeller cover plate 3 to be aligned with the reverse end of the liquid outlet 41 of the impeller bottom plate 4.

[0051] Based on the above situation, for the integral flow channel module, after the annular connecting sleeve 2 forms an integral part, it can be connected with the lower housing 11 by injection molding, for example but not limited to insert injection molding. This processing method can not only ensure the firm installation of the flow channel module, but also save production processes, eliminating the fixing process such as screws.

[0052] Next, it is necessary to explain that the impeller cover plate 3 and the impeller bottom plate 4 of this embodiment are respectively provided with liquid flow channels 7 on the side end surfaces facing each other; the impeller disc 5 is provided with a plurality of channels 52 penetrating the two axial ends thereof along the circumferential direction; and the liquid flow channels 7 on the impeller cover plate 3 and the impeller bottom plate 4 are suitable for respectively cooperating with the impeller disc 5 to form a complete and closed liquid flow cavity, which is simultaneously connected with the liquid inlet 31 and the liquid outlet 41. Under this structure, it is ensured that most of the liquid is in the flow channel or in the impeller disc 5, and driven by the high-speed rotation of the impeller disc 5, it can be ensured that most of the liquid will accelerate along the flow channel without leakage.

[0053] Furthermore, the liquid flow channels 7 on the impeller cover plate 3 and the impeller bottom plate 4 are both C-shaped annular flow channels coaxially arranged with the impeller disk 5; and the C-shaped annular flow channels on the impeller cover plate 3 and the impeller bottom plate 4 have the same structure and are arranged in direct correspondence. The liquid flow channel 7 used in this embodiment is a C-shaped annular shape, that is, the length of the entire C-shaped annular shape spans a circumferential angle of less than 360°.

[0054] The outer wall surface of the impeller disk 5 used in this embodiment is a continuous and closed circumferential surface. A plurality of blades 51 of the same size are arranged at intervals on the impeller disk 5 along the circumferential direction, and a channel 52 is formed between each two adjacent blades 51 .

[0055] In summary, for the impeller assembly of the present embodiment, a leakproof liquid combination is formed between the annular connection sleeve 2 and the impeller accommodating chamber, and the impeller cover plate 3 and the impeller bottom plate 4 are fixed in the annular connection sleeve 2 with the impeller disc 5. Based on this structure, the overall flow channel module can be reliably fixed in the impeller accommodating chamber of the pump housing, and the structure of the annular connection sleeve 2 is not easy to age and has a long service life compared to the traditional sealing ring. Therefore, even with the long-term use of the electronic liquid pump, the failure of the leakproof liquid matching structure will not affect the service life of the electronic liquid pump. In addition, the impeller assembly of the present embodiment can also be used as an integral component in the electronic liquid pump. When assembling it into the electronic liquid pump, it is only necessary to simply fasten the lower housing 11 with the corresponding components on the motor liquid pump, such as the motor unit, by screws, and it is very convenient to disassemble and assemble. In this case, for the whole motor unit, it is only necessary to design a screw hole on the end face where the impeller assembly is assembled, and no other structural design is required, thereby reducing the design difficulty and production cost of the motor unit.

[0056] Embodiment 2:

[0057] See also Figures 1 to 10 As shown, based on the impeller assembly of Example 1, this embodiment provides an electronic liquid pump, which includes the impeller assembly of Example 1 and a motor unit connected thereto.

[0058] The motor unit at least includes a motor housing 81 integrally formed with the base, and an output shaft 82 with one end extending out of the motor housing 81; one end of the output shaft 82 is suitable for passing through the lower housing 11, the impeller base plate 4 and the impeller disk 5 and then inserted into the impeller cover plate 3.

[0059] The impeller cover plate 3 is preset with a positioning hole 33 suitable for inserting the end of the output shaft 82; the positioning hole 33 is provided with a thrust piece 9 that abuts against the end of the output shaft 82. In this embodiment, in order to ensure the high operating efficiency of the electronic liquid pump, the axial clearance between the end of the output shaft 82 and the positioning hole 33 of the impeller cover plate 3 needs to be as small as possible, so that it is easy for the output shaft 82 to rub against the impeller cover plate 3, causing the impeller cover plate 3 to wear, thereby causing the output shaft 82 to move forward, affecting the head of the electronic liquid pump. The thrust piece 9 here can effectively prevent the mutual wear between the end of the output shaft 82 and the impeller cover plate 3 when achieving a high head. It should be noted that the material of the thrust piece 9 in this embodiment is different from that of the impeller cover plate 3, and the thrust piece 9 can be made of wear-resistant metal material.

[0060] It should also be noted that the motor unit of this embodiment can optionally adopt any mature means in the prior art, which generally includes a stator assembly and a rotor assembly used in conjunction. The stator assembly is accommodated in the motor housing 81 to form a dry cavity; the rotor assembly is accommodated in the cavity formed by the stator assembly and the lower housing 11 to form a wet cavity, which is used to hold liquid. Of course, it can be understood that the motor unit also includes a controller to realize the control of the operating state of the motor unit.

[0061] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0062] In the description of the present invention, it is necessary to understand 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 the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0065] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0066] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. An impeller assembly, characterized in that: include: The pump housing comprises a lower housing and an upper housing cover which cooperate to form an impeller accommodating chamber; the upper housing cover is provided with a liquid inlet communicating with the impeller accommodating chamber, and the lower housing is provided with a liquid outlet communicating with the impeller accommodating chamber; A flow channel module is fixed in the impeller accommodating cavity; the flow channel module comprises a liquid delivery unit and an annular connecting sleeve arranged on the outer layer of the liquid delivery unit; the liquid delivery unit comprises an impeller cover plate provided with a liquid inlet, an impeller bottom plate adapted to form a receiving cavity with the impeller cover plate and provided with a liquid outlet, and an impeller disc arranged in the receiving cavity; Liquid flow channels are respectively provided on the side end surfaces facing each other of the impeller cover plate and the impeller bottom plate; a plurality of channels penetrating the two axial ends of the impeller disk are distributed along the circumferential direction; and the liquid flow channels on the impeller cover plate and the impeller bottom plate are suitable for respectively cooperating with the impeller disk to form a complete and closed liquid flow cavity, which is simultaneously connected to the liquid inlet and the liquid outlet.

2. The impeller assembly according to claim 1, characterized in that: The butt joint surfaces of the lower shell and the upper shell cover are suitable for welding connection.

3. The impeller assembly according to claim 1 or 2, characterized in that: At least one L-shaped step surface is formed on the end surface of the lower shell body for matching with the upper shell cover, and correspondingly, an L-shaped matching surface that matches the L-shaped step surface one-to-one is formed on the upper shell cover.

4. The impeller assembly according to claim 1, characterized in that: The flow channel module is suitable for being connected to the lower shell by injection molding as an insert.

5. The impeller assembly according to claim 1 or 4, characterized in that: An L-shaped support platform is formed on the inner wall of the annular connection sleeve; and an L-shaped overlap surface suitable for being mounted on the L-shaped support platform is formed on the corresponding outer side wall of the impeller bottom plate.

6. The impeller assembly according to claim 5, characterized in that: An annular L-shaped sink is formed on the outer circumferential wall surface of the shaft side end of the impeller cover plate away from the impeller bottom plate; and The axial side end of the annular connecting sleeve corresponding to the impeller cover plate is suitable for being at least partially riveted onto the L-shaped sinking platform.

7. The impeller assembly according to claim 1, characterized in that: At least one group of corresponding and communicating positioning grooves are arranged on the outer circumferential wall surfaces of the impeller cover plate and the impeller bottom plate, and the positioning grooves are suitable for the positioning pin to penetrate so that the positioning pin can simultaneously connect the impeller cover plate and the impeller bottom plate.

8. The impeller assembly according to claim 1, characterized in that: The liquid flow channels on the impeller cover plate and the impeller bottom plate are both C-shaped annular flow channels arranged coaxially with the impeller disk; and The C-shaped annular flow channels on the impeller cover plate and the impeller bottom plate have the same structure and are arranged in a corresponding manner.

9. The impeller assembly according to claim 1 or 8, characterized in that: The impeller disk is provided with a plurality of blades of the same specification and size at intervals along the circumferential direction, and the channel is formed between every two adjacent blades.

10. An electronic liquid pump, characterized in that: include: The impeller assembly according to any one of claims 1 to 9, and a motor unit connected to the impeller assembly; The motor unit comprises at least a motor housing integrally formed with the base, and an output shaft with one end extending out of the motor housing; one end of the output shaft is suitable for penetrating the lower housing, the impeller bottom plate and the impeller disc and then being inserted into the impeller cover plate.

11. The electronic liquid pump according to claim 10, characterized in that: The impeller cover plate is preset with a positioning hole suitable for the end of the output shaft to be inserted; The positioning hole is provided with a thrust piece which abuts against the end of the output shaft.

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