Single-phase direct-current brushless motor and electric pump

Abstract

The utility model relates to the technical field of single-phase motors, in particular to a single-phase direct-current brushless motor and an electric pump, and the single-phase direct-current brushless motor comprises a stator assembly and a rotor assembly which can rotate relative to the stator assembly; the stator assembly comprises a plurality of magnetic pole parts, eccentric arc-shaped tooth crown parts are arranged on the sides, close to each other, of the magnetic pole parts, tooth grooves are reserved between the magnetic pole parts, the rotor assembly is rotationally arranged between the tooth crown parts, and uneven air gaps are formed between the rotor assembly and the tooth crown parts and communicated with the tooth grooves. The starting performance of the electric pump can be effectively improved when a single-phase motor is applied.

Description

Technical Field

[0001] This application relates to the technical field of single-phase motors, and in particular to a single-phase DC brushless motor and an electric pump. Background Art

[0002] A single-phase motor is a DC motor powered by a single-phase AC power supply. It can operate on a single-phase power supply while providing the characteristics of a DC motor, such as high efficiency and good speed control. It has now been widely used in household appliances, industrial automation equipment, and some power tools.

[0003] Currently, electric pumps are used in household appliances such as water heating blankets, water heating beds, and air humidifiers. However, in the electric pump system, since the single-phase motor in the electric pump uses the stator winding to generate a magnetic field to drive the permanent magnet rotor to rotate, and the single-phase permanent magnet motor with a common uniform air gap will stop at the dead point position after power off. When powered on again, the initial magnetic field of the stator and the magnetic field of the rotor do not have a starting angle difference, resulting in the motor being difficult to generate a starting torque, which affects the starting performance of the single-phase motor for the electric pump. Utility Model Content

[0004] In order to effectively improve the starting performance of the electric pump when applying a single-phase motor, this application provides a single-phase DC brushless motor and an electric pump.

[0005] In a first aspect, this application provides a single-phase DC brushless motor, including a stator assembly and a rotor assembly that can rotate relative to the stator assembly; the stator assembly includes a plurality of magnetic pole portions, and an eccentric arc-shaped tooth crown portion is provided on one side of each of the plurality of magnetic pole portions close to each other. There are tooth slots between the plurality of magnetic pole portions, the rotor assembly is rotatably arranged between the plurality of tooth crown portions, and an uneven air gap is formed between the rotor assembly and the plurality of tooth crown portions and communicates with the tooth slots.

[0006] By adopting the above technical solution, the setting of the plurality of eccentric arc-shaped tooth crown portions can make the two ends on the same side of the outer periphery of the rotor assembly form an uneven air gap, so as to form different magnetic resistances on the circumferential side of the rotor assembly. Under the action of the magnetic field, the magnetic points of the rotor assembly can stay at the positions with smaller magnetic resistance with a tendency to move, that is, the static positioning angle α of the rotor assembly; when the motor coil winding is powered on, since the rotating magnetic field Bs generated by the stator assembly and the magnetic field Br of the rotor assembly generate a torque of T∝BsBrsinα, the starting torque of the single-phase DC brushless motor of this application when applied to external electrical appliances such as electric pumps can be effectively improved by increasing the static positioning angle α. Therefore, while effectively reducing the noise and vibration generated during startup, the starting response speed of the single-phase DC brushless motor of this application can be better improved.

[0007] Optionally, the stator assembly further includes an iron core portion, the iron core portion is circular as a whole, and the inner wall of the iron core portion is connected to a plurality of magnetic pole portions.

[0008] By adopting the above technical solution, compared with the existing U-shaped stator core, the circular stator core portion adopted in the present application can provide a more uniform magnetic flux distribution, which helps to reduce the cogging effect, thereby providing a smoother torque output and reducing vibration. Secondly, since the surface area of the circular stator core portion is larger, it can also help to improve the heat dissipation performance of the single-phase DC brushless motor of the present application, achieving the purpose of extending the service life.

[0009] Optionally, one side of the iron core portion is connected with an electronic control board through a clamping member.

[0010] By adopting the above technical solution, the disassembly, replacement and convenience of the electronic control board can be effectively improved, and at the same time, the connection stability between the electronic control board and the stator assembly during the operation of the single-phase DC brushless motor of the present application can also be improved.

[0011] Optionally, a plurality of the magnetic pole portions and the tooth crown portions are insulated.

[0012] By adopting the above technical solution, insulating the magnetic pole portions and the tooth crown portions can better reduce the cogging effect between adjacent magnetic pole portions and tooth crown portions, thereby further improving the smoothness of torque output and achieving the purpose of reducing running vibration and noise.

[0013] Optionally, the rotor assembly includes a magnetic ring portion and a rotating shaft portion. The magnetic ring portion is located between a plurality of tooth crown portions. The rotating shaft portion is disposed through the middle of the magnetic ring portion and is used to be connected to an external electrical appliance.

[0014] By adopting the above technical solution, the magnetic ring portion can rotate under the action of the magnetic field, so that the external electrical appliance can be driven to operate through the overall rotation of the magnetic ring portion and the rotating shaft.

[0015] Optionally, the magnetic pole portions are provided with two, and the two magnetic pole portions are arranged oppositely.

[0016] By adopting the above technical solution, a 2-pole motor with the smallest unit can reduce both the rotational speed frequency and the amplitude frequency of the motor, which helps to better reduce the high-frequency noise during the operation of the single-phase motor of the present application.

[0017] Optionally, the tooth crown portions on the two magnetic pole portions are symmetrically distributed about the center. The two sides of the air gap between the tooth crown portion and the magnetic ring portion are respectively a first communication portion and a second communication portion, and the air gap of the first communication portion is larger than the air gap of the second communication portion.

[0018] Optionally, the ratio of the air gap of the first communication portion to the air gap of the second communication portion is 1.2 to 1.7.

[0019] By adopting the above technical solution, the two tooth crown parts with central symmetry distribution can make the distribution trends of magnetic field lines on both sides of the periphery of the magnetic ring part consistent, which helps to improve the running stability of the magnetic ring part. At the same time, by controlling the ratio of the air gap of the first connecting part to the air gap of the second connecting part within the range of 1.2 to 1.7, the air gaps at both ends on the same side of the periphery of the magnetic ring part can be made uneven. Thus, under the action of the rotor magnetic field, the rotor magnetic point can always stay at the position with the minimum magnetic resistance, so as to control the static positioning angle not to be zero, which helps to improve the starting torque of the single-phase motor of the present application.

[0020] In a second aspect, the present application provides an electric pump, which includes a pump housing, a rear cover, an impeller and a pump cover. The stator assembly and the rotor assembly are integrally assembled in the pump housing of the electric pump. The rear cover is assembled at the rear side of the pump housing. The output end of the rotor assembly penetrates through the impeller of the electric pump and is assembled with the pump cover of the electric pump. The pump housing and the pump cover are locked and assembled through mounting parts.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. Through the arrangement of multiple eccentric arc-shaped tooth crown parts, uneven air gaps can be formed on both sides of the outer periphery of the rotor assembly, so as to form different magnetic resistances on the circumferential side of the rotor assembly. Under the action of the magnetic field, the magnetic point of the rotor assembly can tend to stay at the position with smaller magnetic resistance, that is, the static positioning angle α of the rotor assembly; when the motor winding is powered on, since the rotating magnetic field Bs generated by the stator core and the magnetic field Br of the rotor generate a torque of T ∝ BsBrsinα, the starting torque of the single-phase DC brushless motor of the present application when applied to external electrical appliances such as electric pumps can be effectively improved by increasing the static positioning angle α. Thus, while effectively reducing the noise and vibration generated during starting, the starting response speed of the single-phase DC brushless motor of the present application can be better improved;

[0023] 2. By arranging two tooth crown parts with central symmetry distribution, the distribution trends of magnetic field lines on both sides of the periphery of the magnetic ring part can be made consistent, which helps to improve the running stability of the magnetic ring part. At the same time, by controlling the ratio of the air gap of the first connecting part to the air gap of the second connecting part within the range of 1.2 to 1.7, the air gaps at both ends on the same side of the periphery of the magnetic ring part can be made uneven. Thus, under the action of the rotor magnetic field, the rotor magnetic point can always stay at the position with the minimum magnetic resistance, so as to control the static positioning angle not to be zero, which helps to improve the starting torque of the single-phase motor of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the single-phase DC brushless motor and the electric pump in the first embodiment of the present application.

[0025] Figure 2 It is a schematic cross-sectional structural diagram of a single-phase brushless DC motor and an electric pump according to an embodiment of the present application.

[0026] Figure 3 It is a structural schematic diagram of a stator assembly according to an embodiment of the present application.

[0027] Figure 4 It is a schematic diagram of the internal structure of the single-phase brushless DC motor and electric pump in Example 2 of the present application.

[0028] Figure 5 yes Figure 4 A is an enlarged view of the middle image.

[0029] Description of reference numerals: 1. stator assembly; 11. magnetic pole portion; 12. tooth crown portion; 13. tooth groove; 14. core portion; 15. first connecting portion; 16. second connecting portion; 2. rotor assembly; 21. magnetic ring portion; 22. rotating shaft portion; 3. clamping member; 4. electric control board; 5. pump housing; 51. annular rubber ring; 6. rear cover; 7. impeller; 8. pump cover; 81. accommodating groove; 9. mounting member; 91. annular portion; 911, driven gear ring; 92, reinforcing rib; 93, positioning part; 94, O-ring; 95, linkage sleeve; 951, tightening groove; 952, pushing block; 953, extrusion strip; 954, giving way groove; 955, connecting hole; 96, first bolt; 961, driving gear; 97, second bolt; 98, connecting ring; 99, linkage strip; 991, guide strip hole; 992, auxiliary flow plate; 993, linkage groove. DETAILED DESCRIPTION

[0030] The following is combined with Figures 1-5 This application is described in further detail.

[0031] The present application discloses a single-phase brushless DC motor and an electric pump.

[0032] Embodiment 1:

[0033] Reference Figures 1-3 The single-phase brushless DC motor includes a stator assembly 1 and a rotor assembly 2, and the rotor assembly 2 is located on the inner side of the stator assembly 1. Under the action of the electromagnetic field, the rotor assembly 2 rotates relative to the stator assembly 1.

[0034] In this embodiment, the stator assembly 1 includes an iron core portion 14 and a plurality of magnetic pole portions 11. The iron core portion 14 is circular in shape as a whole, and a plurality of magnetic pole portions 11 are evenly arranged on the inner wall of the iron core portion 14 to form tooth slots 13 between the plurality of magnetic pole portions 11. In this embodiment, two magnetic pole portions 11 are arranged, and the two magnetic pole portions 11 are arranged opposite to each other. Specifically, a coil is wound around the outside of each magnetic pole portion 11.

[0035] In addition, a clamping member 3 is provided on one side of the iron core portion 14 away from the output end of the rotor assembly 2, and an electronic control board 4 is provided on the side wall of the clamping member 3. Specifically, in this embodiment, the clamping member 3 includes four uniformly distributed conductive connecting rods. At the same time, four mating grooves are formed on the peripheral side of the electronic control board 4, and the four mating grooves are respectively abutted against the inner walls of the four conductive connecting rods. And conductive protrusions are fixed at the tops of the inner sides of the four conductive connecting rods, so that after the electronic control board 4 abuts against the inner side walls of the four conductive connecting rods, the upper surface edge of the electronic control board 4 can be tightly positioned by the four conductive protrusions. Specifically, in this embodiment, the electronic control board 4 is selected as a PCBA circuit board, and the conductive connecting rods and the conductive protrusions can be electrically connected to the electrical pins of the PCBA circuit board.

[0036] Referring Figures 2-3 , tooth crown portions 12 are provided on the opposite sides of the two magnetic pole portions 11, and the rotor assembly 2 is entirely located between the two tooth crown portions 12. In this embodiment, the rotor assembly 2 includes a magnetic ring portion 21 and a rotating shaft portion 22. Among them, the rotating shaft portion 22 is disposed through the center of the magnetic ring portion 21, and the magnetic ring portion 21 rotates between the two tooth crown portions 12, and an air gap is left between the tooth crown portion 12 and the magnetic ring portion 21, so that the magnetic ring portion 21 and the rotating shaft portion 22 as a whole can rotate stably under the action of the magnetic field, and thus drive the operation of an external electrical appliance through the rotating shaft portion 22.

[0037] Specifically, in this embodiment, both the magnetic pole portion 11 and the tooth crown portion 12 are insulated. The tooth crown portion 12 is provided in an eccentric arc shape and the pole arcs of the tooth crown portion 12 are symmetrically distributed about the center. At the same time, a first communication portion 15 and a second communication portion 16 are respectively provided on both sides of the air gap between the tooth crown portion 12 and the magnetic ring portion 21. Among them, the air gap distance of the first communication portion 15 is greater than the air gap distance of the second communication portion 16. And in this embodiment, the ratio of the air gap distance of the first communication portion 15 to the air gap distance of the second communication portion 16 is 1.5; in another embodiment, the ratio of the air gap distances can be selected as 1.2; in still another embodiment, the ratio of the air gap distances can be selected as 1.7.

[0038] Implementation principle: When starting, an external power supply is energized to the electronic control board 4 through a wire. Then, when an electric current passes through the coil, a magnetic field will be generated. The generated magnetic field will drive the magnetic ring portion 21 and the rotating shaft portion 22 as a whole to rotate between the tooth crown portions 12, so as to drive the operation of an external electrical appliance through the rotating shaft portion 22;

[0039] Among them, since uneven air gaps are formed at both ends on the same side of the outer periphery of the magnetic ring part 21, under the action of the magnetic field, the magnetic points of the magnetic ring part 21 can stay at the places with relatively small magnetic resistance with a tendency to move (avoiding the situation where the starting torque is 0), which is the static positioning angle α of the rotor assembly 2. Thus, when the motor coil winding is energized, since the iron core part 14 of the stator generates a rotating magnetic field Bs and the magnetic field Br of the rotor assembly 2 generates a torque T ∝ BsBrsinα, the starting torque of the single-phase DC brushless motor of the present application can be effectively improved when applied to external electrical appliances such as electric pumps by increasing the static positioning angle α. Furthermore, while effectively reducing the noise and vibration generated during starting, the starting response speed of the single-phase DC brushless motor of the present application can be better improved.

[0040] Second aspect: Embodiment 1 of the present application also discloses an electric pump, which includes a pump housing 5, a rear cover 6, an impeller 7 and a pump cover 8. Among them, the overall stator assembly 1 and rotor assembly 2 are arranged inside the pump housing 5. The electronic control board 4 is assembled at the rear side of the stator assembly 1 through a clamping member 3, and the rear cover 6 is pressed against the rear side of the pump housing 5. At the same time, the hub of the impeller 7 is sleeved on the output end of the rotor assembly 2, and the rotating shaft part 22 of the rotor assembly 2 penetrates through the impeller 7 and is assembled with the bushing inside the pump cover 8. In addition, the pump cover 8 is locked and assembled on the front side of the pump housing 5 through a mounting member 9.

[0041] Specifically, a plurality of grooves are evenly formed on the inner wall of the rear side of the pump housing 5, and a plurality of protrusions are correspondingly arranged on the circumferential side of the rear cover 6. During installation, the plurality of protrusions on the rear cover 6 can be respectively inserted into the plurality of grooves on the inner wall of the rear side of the pump housing 5, so that each protrusion can have an interference fit with the corresponding groove, achieving the purpose of quickly assembling the rear cover 6 on the rear side of the pump housing 5.

[0042] Specifically, referring to Figures 1-2 , in this embodiment, the mounting member 9 can be selected as a screw. Among them, annular parts 91 are provided on the outer surfaces of both the pump cover 8 and the pump housing 5, and a plurality of reinforcing ribs 92 are provided on the side walls of the two annular parts 91 away from each other. At the same time, four positioning parts 93 are evenly arranged outside the annular part 91, and the mounting member 9 penetrates through the annular part 91 of the pump cover 8 and extends into the annular part 91 of the pump housing 5 to be threadedly connected, thereby realizing the connection and locking between the pump cover 8 and the pump housing 5. It is worth mentioning that in order to enhance the connection sealing performance between the pump housing 5 and the pump cover 8, an O-ring 94 is annularly arranged inside the pump housing 5 close to the pump cover 8.

[0043] Embodiment 2:

[0044] Referring to Figure 1 and 4-5. The difference between this embodiment and the first embodiment is that the mounting member 9 of this embodiment includes a linkage sleeve 95, a first bolt 96, and a second bolt 97. Among them, the linkage sleeve 95 is slidably connected inside the positioning portion 93 of the pump housing 5 and can extend through to the side of the annular portion 91 close to the pump cover 8. The first bolt 96 is rotatably connected inside the positioning portion 93 of the pump cover 8 on the side away from the pump housing 5, and one end of the first bolt 96 close to the pump housing 5 is threadedly connected to the inside of the linkage sleeve 95, while the second bolt 97 is threadedly connected inside the positioning portion 93 of the pump housing 5 on the side away from the pump cover 8, and one end of the second bolt 97 extending through to the inside of the positioning portion 93 of the pump housing 5 abuts against the abutting groove 951 opened at the end of the linkage sleeve 95.

[0045] Specifically, in order to facilitate the rotation of the first bolts 96 on the positioning portions 93 of multiple pump covers 8, a driving gear 961 is sleeved on the outer wall of each first bolt 96. At the same time, a driven gear ring 911 is rotatably arranged inside the annular portion 91 of the pump cover 8, and the driven gear ring 911 meshes with multiple driving gears 961 at the same time.

[0046] Refer to Figures 4-5 , in order to further reduce the noise when the single-phase motor drives the electric pump to operate, in this embodiment, the mounting member 9 further includes a connecting ring 98 and a linkage bar 99. Among them, the connecting ring 98 is sleeved and fixed at one end of the outer wall of the linkage sleeve 95 close to the first bolt 96. One end of the linkage bar 99 is connected to the connecting ring 98, and guide bar holes 991 communicating with the inside of the pump cover 8 and capable of providing a moving space for the linkage bar 99 are opened on the outer wall of the pump cover 8 and on the side of the positioning portion 93 of the pump cover 8 close to the pump cover 8. At the other end of the linkage bar 99, a secondary flow plate 992 integrally arranged in an arc shape is slidably connected. At the same time, a receiving groove 81 is opened on the inner wall of the pump cover 8, and the secondary flow plate 992 is entirely located inside the receiving groove 81 and both ends of one side are rotatably connected to the groove wall of the receiving groove 81.

[0047] Specifically, four secondary flow plates 992 are evenly distributed in four receiving grooves 81 opened on the inner wall of the pump cover 8 and correspond to the position of the mounting member 9. At the same time, a linkage groove 993 with a T-shaped cross-section is opened on the back of the secondary flow plate 992. The end of the linkage bar 99 extends through to the inside of the receiving groove 81, and driving blocks are arranged on both sides of the end of the linkage bar 99 extending through to the inner side of the receiving groove 81, so that the end of the linkage bar 99 is slidably connected to the linkage groove 993 on the back of the secondary flow plate 992 through the two driving blocks. Among them, the end of the linkage bar 99 is set to be wedge-shaped, and the bottom of the linkage groove 993 is set to be wedge-shaped adapted to the end face of the linkage bar 99.

[0048] Refer to Figures 4-5, in order to better improve the connection stability of the mounting member 9, in this embodiment, the mounting member 9 further includes a pushing block 952 and a pressing strip 953. Among them, the pushing block 952 is sleeved and fixed on the outer wall of the linkage sleeve 95 and is integrally frustum-shaped. At the same time, a relief groove 954 is formed in the side wall of the pushing block 952 close to the pump housing 5, one end of the pressing strip 953 is slidably connected in the relief groove 954, and the other end of the pressing strip 953 penetrates to the inner wall of the pump housing 5.

[0049] Specifically, communication holes 955 are formed on both the outer wall of the pump housing 5 and the side of the positioning portion 93 of the pump housing 5 close to the pump housing 5, so as to facilitate the movement of the pressing strip 953 driven by the pushing block 952 through the arrangement of the communication holes 955. One end of the pressing strip 953 far from the pushing block 952 is triangular, and in this embodiment, both the pushing block 952 and the pressing strip 953 are permanent magnets.

[0050] Further, referring to Figures 4-5 , an annular groove is formed in the pump housing 5 corresponding to the O-ring 94. Specifically, an annular rubber ring 51 is filled in the annular groove, and the annular rubber ring 51 presses against the outside of the O-ring 94. At the same time, the annular groove is communicated with the two communication holes 955, and one end of the pressing strip 953 penetrating the communication strip hole abuts against the outer wall of the annular rubber ring 51. It is worth mentioning that the side of the annular rubber ring 51 abutting against the pressing strip 953 is provided as an inclined surface.

[0051] Implementation principle: When one of the first bolts 96 is screwed, the linkage sleeve 95 can be driven by the first bolt 96 to move inside the positioning portion 93 of the pump housing 5. At this time, the driving gear 961 will drive the driven toothed ring 911 to rotate, so as to synchronously drive a plurality of driving gears 961 to rotate through the driven toothed ring 911, so as to realize the synchronous screwing of a plurality of first bolts 96;

[0052] Among them, when the linkage sleeve 95 moves, it will drive the linkage bar 99 to move in the guiding strip hole 991, so that the end of the linkage bar 99 can drive the auxiliary flow plate 992 to turn out in the accommodation groove 81. At the same time, the pushing block 952 on the outer wall of the linkage sleeve 95 will drive the pressing strip 953 to insert toward the side close to the annular rubber ring 51 during the movement, so that the annular rubber ring 51 can enhance the pressing effect on the O-ring 94; finally, the second bolt 97 is threadedly connected to the other end of the positioning portion 93 of the pump housing 5 until the end of the second bolt 97 abuts against the abutting groove 951 at the end of the linkage sleeve 95 far from the first bolt 96, so as to realize the sealed connection between the pump cover 8 and the pump housing 5.

[0053] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A single-phase brushless DC motor, characterized in that: The invention comprises a stator assembly (1) and a rotor assembly (2) rotatable relative to the stator assembly (1); the stator assembly (1) comprises a plurality of magnetic pole portions (11); a plurality of magnetic pole portions (11) are provided with eccentric arc-shaped tooth crown portions (12) on one side close to each other; tooth slots (13) are left between the plurality of magnetic pole portions (11); the rotor assembly (2) is rotatably arranged between the plurality of tooth crown portions (12); an uneven air gap is formed between the rotor assembly (2) and the plurality of tooth crown portions (12) and is in communication with the tooth slots (13).

2. A single-phase brushless DC motor according to claim 1, characterized in that: The stator assembly (1) further comprises an iron core portion (14), the iron core portion (14) being circular in shape as a whole, and an inner wall of the iron core portion (14) being connected to a plurality of magnetic pole portions (11).

3. A single-phase brushless DC motor according to claim 2, characterized in that: One side of the iron core part (14) is connected to an electric control board (4) via a clamping piece (3).

4. A single-phase brushless DC motor according to claim 2, characterized in that: The plurality of magnetic pole portions (11) and the tooth crown portion (12) are all insulated.

5. The single-phase brushless DC motor according to claim 2, characterized in that: The rotor assembly (2) comprises a magnetic ring portion (21) and a rotating shaft portion (22); the magnetic ring portion (21) is located between the plurality of tooth crown portions (12); and the rotating shaft portion (22) is arranged through the middle of the magnetic ring portion (21) and is used to be connected to an external electrical appliance.

6. A single-phase brushless DC motor according to claim 5, characterized in that: The number of magnetic pole portions (11) is two, and the two magnetic pole portions (11) are arranged opposite to each other.

7. A single-phase brushless DC motor according to claim 6, characterized in that: The tooth crown portions (12) on the two magnetic pole portions (11) are centrally symmetrically distributed, and the two sides of the air gap between the tooth crown portion (12) and the magnetic ring portion (21) are respectively the first connecting portion (15) and the second connecting portion (16), and the air gap of the first connecting portion (15) is larger than the air gap of the second connecting portion (16).

8. The single-phase brushless DC motor according to claim 7, characterized in that: The ratio of the air gap of the first connecting portion (15) to the air gap of the second connecting portion (16) is 1.2-1.

7.

9. An electric pump, using any one of the single-phase brushless DC motors of claims 1-8, characterized in that: The electric pump comprises a pump casing (5), a rear cover (6), an impeller (7) and a pump cover (8); the stator assembly (1) and the rotor assembly (2) are integrally assembled in the pump casing (5) of the electric pump; the rear cover (6) is assembled on the rear side of the pump casing (5); the output end of the rotor assembly (2) passes through the impeller (7) of the electric pump and is assembled with the pump cover (8) of the electric pump; the pump casing (5) and the pump cover (8) are locked and assembled by means of a mounting member (9).

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