Ultra-low water level self-priming pump

Abstract

The invention relates to the technical field of self-priming pumps, in particular to an ultralow-water-level self-priming pump which comprises a water pump shell with a water inlet and a water outlet, a motor arranged in the water pump shell and an impeller connected to an output shaft of the motor, a lower cover connected to the interior of the shell through an axial fixing structure, and an upper cover connected to the lower cover through an axial connecting structure. A space for accommodating a stator group of the motor is formed between the upper cover and the lower cover, the stator group is mounted in the space, the axial connecting structure is connected with the outer wall of the stator group through a first circumferential locking structure, and a second circumferential locking structure is arranged between the upper cover and / or the lower cover and the outer wall of the stator group. Efficient and stable operation under the low-water-level condition is achieved. The motor drives the impeller to generate centrifugal force, and liquid is sucked and discharged. The axial fixing structure and the circumferential locking structure guarantee the stability of the motor stator set, and the overall reliability of the pump is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of self-priming pumps, and more particularly, to an ultra-low water level self-priming pump. Background Art

[0002] Ultra-low water level self-priming pumps are widely used in fields such as agricultural irrigation and industrial water supply, especially in areas with water shortages or large water level fluctuations. Mechanical vibration is a common problem in all rotating equipment, and if not controlled, it may lead to serious mechanical failures.

[0003] When an ultra-low water level self-priming pump operates under extremely low water level conditions, due to the lack of sufficient water to buffer and absorb vibrations, mechanical vibrations will be directly transmitted to various components of the pump, especially the bearing housing and the stator. Long-term mechanical vibrations will cause physical deformation and displacement of these key components, thereby reducing the efficiency of the pump, increasing maintenance costs, and may lead to downtime. Stator displacement may cause changes in the gap between the motor winding and the rotor, affecting the electrical performance and thermal management of the motor. Summary of the Invention

[0004] In view of this, the present invention proposes an ultra-low water level self-priming pump, aiming to solve the problems existing in the current technology.

[0005] The present invention proposes an ultra-low water level self-priming pump, which includes a pump housing having an inlet and an outlet, a motor provided in the pump housing, and an impeller connected to the output shaft of the motor. A lower cover is connected in the housing through an axial fixing structure, and the lower cover is connected to an upper cover through an axial connection structure. A space for accommodating the stator group of the motor is formed between the upper cover and the lower cover. The stator group is installed in the space, and the axial connection structure is connected to the outer wall of the stator group through a first circumferential locking structure. A second circumferential locking structure is provided between the upper cover and / or the lower cover and the outer wall of the stator group.

[0006] In some embodiments of the present application, the axial connection structure includes at least two threaded rods, a threaded portion for threaded connection with the threaded rods is provided on the upper cover or the lower cover, and the first circumferential locking structure includes a plurality of first positioning grooves provided on the outer wall of the stator group, and at least a part of each threaded rod is stuck in the first positioning groove.

[0007] In some embodiments of the present application, the second circumferential locking structure includes a second positioning groove and a positioning protrusion that match each other, and either the second positioning groove or the positioning protrusion is provided on the upper cover, and the remaining one is provided on the outer wall of the stator group.

[0008] In some embodiments of the present application, an upper axial limiting structure is provided between the stator group and the upper cover, and a lower axial limiting structure is provided between the stator group and the lower cover.

[0009] In some embodiments of the present application, the upper axial limiting structure includes an upper limiting step provided on the inner wall of the lower end of the upper cover, and an upper limiting portion on the outer wall of the stator group that is stuck to the upper limiting step; the lower axial limiting structure includes a lower limiting step provided on the inner wall of the upper end of the lower cover, and a lower limiting portion on the outer wall of the stator group that is stuck to the lower limiting step.

[0010] In some embodiments of the present application, the axial fixing structure includes an outwardly convex annular positioning groove provided on the inner wall of the lower end of the water pump housing, and an outwardly convex annular portion on the outer periphery of the lower cover that is stuck in the outwardly convex annular positioning groove, and a sealing ring is provided between the outer peripheries of the outwardly convex annular positioning groove and the outwardly convex annular portion.

[0011] In some embodiments of the present application, the upper cover includes a circular ring portion, and a plurality of arc-shaped support arms connected to the circular ring portion and converging inwardly at the upper ends, and at least part of the second circumferential locking structure is provided on the inner wall of the circular ring portion.

[0012] In some embodiments of the present application, the ultra-low water level self-priming pump further includes two non-contact liquid level sensors, and the two non-contact liquid level sensors are arranged on the water level adjustment guide rails on the outer wall of the water pump housing through a position adjustment structure.

[0013] In some embodiments of the present application, the position adjustment structure includes a plurality of card slots provided on the two side walls of the water level adjustment guide rail, and elastic arm type buckles provided on the two side walls of the non-contact liquid level sensor, and the elastic arm type buckles are stuck in any one of the card slots.

[0014] In some embodiments of the present application, a wire blocking buckle is further provided on the water level adjustment guide rail, the wire blocking buckle is sleeved on at least part of the two side walls of the water level adjustment guide rail, and a clamping portion is provided on the wire blocking buckle, and the clamping portion is stuck in any one of the card slots.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The ultra-low water level self-priming pump of the present invention realizes efficient and stable operation under low water level conditions. The motor drives the impeller to generate centrifugal force, sucking and discharging the liquid. The axial fixing structure and the circumferential locking structure ensure the stability of the motor stator group and improve the overall reliability of the pump. The lower cover is connected inside the housing through the axial fixing structure, and the upper cover is connected to the lower cover through the axial connection structure, ensuring the stability and reliability between the components. The stator group is installed in a specific space formed between the upper cover and the lower cover. The first circumferential locking structure and the second circumferential locking structure are respectively used to fix the outer wall of the stator group, ensuring that it will not move axially or radially during operation, guaranteeing the normal operation of the motor, and further ensuring the efficient operation of the self-priming pump under various complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 FIG. 1 is a perspective view of the ultra-low water level self-priming pump provided by an embodiment of the present invention; Figure 2 FIG. 2 is a side view of the ultra-low water level self-priming pump provided by an embodiment of the present invention; Figure 3 FIG. 3 is the sectional view taken along the line A-A of the... provided by an embodiment of the present invention Figure 2 in FIG. 1; Figure 4 FIG. 4 is the enlarged partial view at B in... provided by an embodiment of the present invention Figure 3 in FIG. 1; Figure 5 FIG. 5 is an exploded view of the motor provided by an embodiment of the present invention; Figure 6 FIG. 6 is the enlarged partial view at C of the... provided by an embodiment of the present invention Figure 1 in FIG. 5; Figure 7 FIG. 7 is the enlarged partial view at D of the... provided by an embodiment of the present invention Figure 3 in FIG. 5.

[0017] In the figure: 1. Water pump housing; 100. Central through hole; 101. Lateral through hole; 12. Water outlet; 121. Check valve; 13. Top cover; 14. Base; 141. Outer convex annular positioning groove; 15. Sealing ring; 16. Capacitor accommodation chamber; 21. Upper cover; 211. Positioning protrusion; 212. Upper limit step; 213. Circular ring part; 214. Arc-shaped support arm; 22. Lower cover; 221. Lower limit step; 222. Outer convex annular part; 23. Motor output shaft; 230. Penetrating part; 231. Nut part; 232. Flow guiding arc surface; 24. Stator group; 241. First positioning groove; 242. Second positioning groove; 243. Upper limit part; 244. Lower limit part; 25. Rotor group; 26. Threaded rod; 30. Central part; 31. Shaft hole; 32. Enlarged hole; 33. Annular cylinder; 3. Impeller; 4. Non-contact liquid level sensor; 41. Elastic arm type buckle; 5. Water level adjustment guide rail; 51. Card slot; 6. Wire blocking buckle; 7. Capacitor; 71. Capacitor housing; 72. Cantilever part; 73. Embedded conductive part; 8. External power cord; 81. Conductive terminal. Detailed implementation mode

[0018] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. Hereinafter, the present invention will be described in detail with reference to the drawings and in conjunction with the embodiments.

[0019] Embodiment 1. Refer to Figures 1 - 3 , this embodiment provides an ultra-low water level self-priming pump, which includes a water pump housing 1 having a water inlet and a water outlet 12. A check valve 121 is provided in the water outlet 12. A motor is provided in the water pump housing 1, and an impeller 3 connected to the motor output shaft 23. A lower cover 22 is connected in the housing through an axial fixing structure, and the lower cover 22 is connected to an upper cover 21 through an axial connection structure. A space for accommodating the stator group 24 of the motor is formed between the upper cover 21 and the lower cover 22. The stator group 24 is installed in the space, and the axial connection structure is connected to the outer wall of the stator group 24 through a first circumferential locking structure, and a second circumferential locking structure is provided between the upper cover 21 and / or the lower cover 22 and the outer wall of the stator group 24.

[0020] It can be understood that in this embodiment, the water pump housing 1 is the main part of the entire self-priming pump. It has a water inlet and a water outlet 12 for guiding water flow into and out of the pump body. An electric motor is provided inside the water pump housing 1, and the electric motor is used to provide power to drive the impeller 3 inside the pump body to rotate, thereby realizing the water pumping function. The impeller 3 is connected to the output shaft 23 of the electric motor. When the electric motor starts, the impeller 3 rotates to generate centrifugal force, sucking water from the water inlet and discharging it through the water outlet 12. The lower cover 22 is connected inside the housing through an axial fixing structure, and the upper cover 21 is connected to the lower cover 22 through an axial connection structure, ensuring the stability and reliability between the components. The stator group 24 is installed in a specific space formed between the upper cover 21 and the lower cover 22. The first circumferential locking structure and the second circumferential locking structure are respectively used to fix the outer wall of the stator group 24, ensuring that it does not move axially or radially during operation, guaranteeing the normal operation of the electric motor, and further ensuring the efficient operation of the self-priming pump under various complex working conditions.

[0021] Further, in combination with Figure 5 As shown, the rotor group 25 of the electric motor is inside the stator group 24, and the rotor group 25 is respectively connected to the upper cover 21 and the lower cover 22 through a rotating shaft. At the same time, the rotating shaft is axially fixed to the upper cover 21 and the lower cover 22 respectively, and the rotating shaft can rotate relative to the upper cover 21 and the lower cover 22. A communication channel connecting the water inlet and the water outlet 12 is provided on the water pump housing 1, and at the same time, the impeller 3 is at the water inlet.

[0022] It can be understood that in this embodiment, the rotor group 25 is located inside the stator group 24 and generates a rotational motion through the principle of electromagnetic induction. The stator group 24 provides a fixed magnetic field, and the rotor group 25 rotates in the magnetic field, thereby realizing energy conversion. The rotating shaft transmits the rotational motion of the rotor group 25 to other structures. Although the rotating shaft is axially fixed, it can rotate relative to the upper cover 21 and the lower cover 22, ensuring the normal operation of the rotor group 25. The upper cover 21 and the lower cover 22 not only protect the internal components of the electric motor but also play a role in fixing the rotating shaft, ensuring that the rotating shaft remains stable during operation and preventing axial movement, thereby guaranteeing the efficient operation of the electric motor.

[0023] It can be understood that the communication channel on the water pump housing 1 connects the water inlet and the water outlet 12, enabling the water flow to pass through smoothly. When the electric motor drives the rotating shaft to rotate, the impeller 3 also rotates accordingly, sucking water from the water inlet and accelerating it using centrifugal force, and finally discharging it through the communication channel, realizing the water pumping function.

[0024] Further, the axial connection structure includes at least two threaded rods 26. The upper cover 21 or the lower cover 22 is provided with a threaded portion threadedly connected to the threaded rod 26, and the first circumferential locking structure includes a plurality of first positioning grooves 241 provided on the outer wall of the stator group 24, and at least a part of each threaded rod 26 is stuck in the first positioning groove 241.

[0025] It can be understood that in this embodiment, the threaded portion provided on the upper cover 21 or the lower cover 22 cooperates with the threaded rod 26 to achieve the fixing and adjusting functions through threaded connection, thereby ensuring the stability and reliability of the structure. The first circumferential locking structure is used to limit the axial displacement of the threaded rod 26, prevent loosening or falling off caused by vibration or other external forces, and further maintain the stability of the overall structure. The stator group 24, as the stationary part of the device, the first positioning groove 241 on its outer wall cooperates with the threaded rod 26, which can effectively disperse stress, reduce wear, improve the service life and reliability of the structure while achieving circumferential locking of the stator group 24.

[0026] And the stator group 24 includes a skeleton coil main body and an annular member fixed circumferentially to the skeleton coil main body. The first positioning groove 241 is provided axially on the outer wall of the annular member. The annular member is fixed to the middle position of the skeleton coil main body by a plurality of fasteners, and the cooperation between the threaded rod 26 and the first positioning groove 241 can also play a role in heat dissipation.

[0027] Furthermore, the second circumferential locking structure includes a second positioning groove 242 and a positioning protrusion 211 that match each other. Either the second positioning groove 242 or the positioning protrusion 211 is provided on the upper cover 21, and the remaining one is provided on the outer wall of the stator group 24. A part of the positioning protrusion 211 is inserted into the second positioning groove 242, and at this time, the second positioning groove 242 can also be used for heat dissipation.

[0028] It can be understood that in this embodiment, the second circumferential locking structure is used to limit the circumferential rotation of the stator group 24, prevent unnecessary movement of the stator group 24 caused by vibration or external forces, and thus ensure the normal operation of the motor. In this embodiment, the stator group 24 is fixed through the mutual cooperation of the second positioning groove 242 and the positioning protrusion, which not only improves the operating efficiency of the motor but also extends the service life of the motor.

[0029] Furthermore, an upper axial limiting structure is provided between the stator group 24 and the upper cover 21, and a lower axial limiting structure is provided between the stator group 24 and the lower cover 22.

[0030] Furthermore, the upper axial limiting structure includes an upper limiting step 212 provided on the inner wall of the lower end of the upper cover 21, and the outer wall of the stator group 24 has an upper limiting portion 243 that is stuck to the upper limiting step 212; the lower axial limiting structure includes a lower limiting step 221 provided on the inner wall of the upper end of the lower cover 22, and the outer wall of the stator group 24 has a lower limiting portion 244 that is stuck to the lower limiting step 221.

[0031] It can be understood that in this embodiment, the upper limit portion 243 is snapped into the upper limit step 212 to limit the upward movement of the stator group 24, and the lower limit portion 244 is snapped into the lower limit step 221 to limit the downward movement of the stator group 24. That is, the upper axial limit structure and the lower axial limit structure fix the stator group 24 in the up and down directions through mechanical cooperation, ensuring that it will not undergo axial displacement due to vibration or other external forces during operation.

[0032] Furthermore, the axial fixing structure includes an outwardly convex annular positioning groove 141 provided at the lower end of the inner wall of the water pump housing 1, and an outwardly convex annular portion 222 on the outer periphery of the lower cover 22 that is clamped in the outwardly convex annular positioning groove 141, and a sealing ring 15 is provided between the outer peripheries of the outwardly convex annular positioning groove 141 and the outwardly convex annular portion 222.

[0033] It can be understood that in this embodiment, the axial fixing structure clamps the outwardly convex annular portion 222 of the lower cover 22 into the outwardly convex annular positioning groove 141 on the inner wall of the water pump housing 1, and a sealing ring 15 is provided in the outwardly convex annular positioning groove 141. Through the cooperation of the outwardly convex annular positioning groove 141 and the outwardly convex annular portion 222, precise axial fixation of the lower cover 22 is achieved; at the same time, the use of the sealing ring 15 not only enhances the fixing effect but also effectively isolates the operating space of the impeller 3 and the operating space of the motor, preventing liquid from entering the motor and ensuring the safe operation of the motor.

[0034] Furthermore, the upper cover 21 includes a circular ring portion 213, and a plurality of arc-shaped support arms 214 connected to the circular ring portion 213 and converging inwardly at the upper ends, and at least part of the second circumferential locking structure is provided on the inner wall of the circular ring portion 213.

[0035] It can be understood that in this embodiment, the circular ring portion 213 and the arc-shaped support arms 214 provide multi-level support and protection. At least part of the second circumferential locking structure is provided on the inner wall of the circular ring portion 213 to enhance the overall stability of the structure and prevent loosening or displacement.

[0036] Furthermore, in combination Figures 1 - 3 with Figure 6 as shown, the ultra-low water level self-priming pump further includes two non-contact liquid level sensors 4, and the two non-contact liquid level sensors 4 are arranged on the water level adjustment guide rail 5 on the outer wall of the water pump housing 1 through a position adjustment structure. The position adjustment structure includes a plurality of card slots 51 provided on the two side walls of the water level adjustment guide rail 5, and spring arm type buckles 41 provided on the two side walls of the non-contact liquid level sensor 4, and the spring arm type buckles 41 are clamped in any one of the card slots 51. The position adjustment structure further includes a sliding part and a sliding groove that cooperate with each other, the sliding groove is arranged between the two side walls of the water level adjustment guide rail 5, and the sliding part is arranged on the non-contact liquid level sensor 4.

[0037] It can be understood that in this embodiment, the non-contact liquid level sensor 4 is arranged on the water level adjustment guide rail 5, and the specific installation position of the non-contact liquid level sensor 4 is adjusted through the position adjustment structure to meet different water level requirements. The position adjustment structure allows the user to adjust and fix the position of the sensor as needed through the cooperation of the elastic arm type buckle 41 and any slot 51. In addition, the position adjustment structure further includes a sliding part and a chute that cooperate with each other. The cooperation of the sliding part and the chute provides guidance and limitation when adjusting the specific position of the non-contact liquid level sensor 4, ensuring that it will not deviate from the predetermined track during the adjustment process, thereby reducing the risk of operation errors.

[0038] Specifically, in this embodiment, the two non-contact liquid level sensors 4 are electrically connected to the controller of the water pump, and the two non-contact liquid level sensors 4 are respectively arranged at the positions corresponding to the start water level and the stop water level. When the water level reaches the start water level, the water pump starts, and when the water level reaches the stop water level, the water pump stops. The start water level height and the stop water level height can be freely adjusted through the position adjustment structure.

[0039] Furthermore, a wire blocking buckle 6 is also arranged on the water level adjustment guide rail 5. The wire blocking buckle 6 is sleeved on at least part of the two side walls of the water level adjustment guide rail 5, and a clamping part is arranged on the wire blocking buckle 6. The clamping part is clamped in any slot 51.

[0040] It can be understood that the clamping part of the wire blocking buckle 6 in this embodiment cooperates with the slot 51 of the water level adjustment guide rail 5, which can be conveniently installed and disassembled, and at the same time ensures the stability of the buckle.

[0041] Furthermore, in combination with Figures 3 - 4 As shown, between the inner top of the water pump housing 1 and the top of the upper cover 21, there is an upper cover 21 reinforcement component, and the upper cover 21 reinforcement component includes a capacitor housing 71, a fastener, a cantilever part 72, and a conductive terminal 81, so that based on the lower cover 22, the top side of the upper cover 21 is also limited, thereby forming axial limits at both ends for the entire stator group 24, ensuring the stable position of the stator group 24, and at the same time ensuring the movement stability of the rotor group 25.

[0042] Further, a capacitor accommodation chamber 16 is formed between the upper cover 21 and the inner top of the water pump housing 1, and a capacitor 7 is installed in the capacitor accommodation chamber 16. There is a spacing between the top surface of the capacitor 7 and the inner top of the water pump housing 1. At the same time, one side of the bottom of the capacitor housing 71 of the capacitor 7 is connected to the upper cover 21 through a fastener. A plurality of conductive terminals 81 with lower ends extending into the capacitor accommodation chamber 16 are embedded in the top of the water pump housing 1. On the other side of the top of the capacitor housing 71, there is a cantilever portion 72, and the lower end of the conductive terminal 81 abuts against the upper surface of the cantilever portion 72. The conductive terminal 81 is threadedly connected to the threaded hole of the water pump housing 1. The upper end of the conductive terminal 81 is sleeved and pressed by a nut at the upper end of the threaded hole.

[0043] Specifically, the external power supply line 8 supplies power to the capacitor 7, and the capacitor 7 transfers the power to the motor through electrical connection, enabling the motor to operate normally.

[0044] Further, an embedded conductive part 73 electrically connected to the capacitor 7 is embedded in the wall thickness of the capacitor housing 71. The conductive terminal 81 directly abuts against the exposed part of the embedded conductive part 73, so that the electrical connection is more convenient. At the same time, the exposed part and the conductive terminal 81 are reinforced with conductive glue. The conductive terminal 81 is cylindrical.

[0045] It can be understood that in this embodiment, the capacitor housing 71 can be stably fixed only by the abutment of the conductive terminal 81 and the cantilever portion 72, and the connection of one fastener to the upper cover 21. Traditional fixing methods usually rely on multiple fasteners, which increases the cost and complexity. This embodiment not only reduces the material and labor costs, but also simplifies the installation steps, significantly improving the production efficiency.

[0046] Further, the water pump housing 1 includes a base 14 and a top cover 13. At least part of the outwardly convex annular positioning groove 141 is located on the inner wall of the lower cover 22, and the remaining part is located on the inner wall of the top cover 13. First, after the motor, the upper cover 21, and the lower cover 22 are assembled and placed on the base 14, and a sealing ring 15 is placed, so that the outwardly convex annular portion 222 of the lower cover 22 and the sealing ring 15 are located at least partially in the outwardly convex annular positioning groove 141. Then, the top cover 13 and the base 14 are covered and fixedly connected through fasteners. The cooperation of the outwardly convex annular positioning portion and the outwardly convex annular positioning groove 141 axially fixes the whole of the motor, the upper cover 21, and the lower cover 22 again, enhancing the stability and safety of the overall structure.

[0047] The working principle of this embodiment is as follows: After the motor is powered on, the motor drives the impeller 3 to rotate at this time, and water enters from the water inlet and is discharged from the water outlet 12. The stator group 24 of the motor remains stationary, while the rotor group 25 rotates and drives the impeller 3 to rotate.

[0048] Embodiment 2, based on Embodiment 1, as Figure 7 shown, this embodiment further discloses the following: A central portion 30 extending towards the water inlet side is provided at the central position of the impeller 3. An axial hole 31 is provided in the axial direction of the central portion 30. Enlarged holes 32 are respectively provided at the upper end and the lower end of the axial hole 31. The lower end of the motor output shaft 23 is inserted into the upper enlarged hole 32, and a through portion 230 passing through the axial hole 31 and the other enlarged hole 32 is connected to the lower end portion of the motor output shaft 23. A nut member 231 at least partially located in the other enlarged hole 32 is threadedly connected to the through portion 230. An annular cylinder 33 extending towards the water inlet is provided at the lower end portion of the impeller 3. The through portion 230 extends into the annular cylinder 33, and a guiding arc surface 232 is provided at the lower end of the outer wall of the nut member 231.

[0049] The water inlet includes a central through hole 100 and a plurality of lateral through holes 101 located outside the central through hole 100. The central through hole 100 is directly below the through portion 230. The through portion 230 can divert the water flowing into the central through hole 100 on a plane perpendicular to the axis of the central through hole 100. In summary, the above structure can accelerate the diversion of the water at the water inlet into the impeller 3 to improve efficiency.

[0050] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0051] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowcharts and / or block diagrams can be implemented by computer program instructions, and the combination of the processes and / or blocks in the flowcharts and / or block diagrams can also be implemented. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0052] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction means that implements the function specified in one or more of the procedures Figure 1 a procedure or procedures and / or blocks Figure 1 specified in a block or blocks.

[0053] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the function specified in one or more of the procedures Figure 1 a procedure or procedures and / or blocks Figure 1 specified in a block or blocks.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. An ultra-low water level self-priming pump, comprising a pump housing (1) having a water inlet and a water outlet (12), a motor disposed in the pump housing (1), and an impeller (3) connected to an output shaft (23) of the motor, characterized in that, Inside the housing, a lower cover (22) is connected by an axial fixing structure, and the lower cover (22) is connected to an upper cover (21) by an axial connection structure. A space for accommodating the stator group (24) of the motor is formed between the upper cover (21) and the lower cover (22). The stator group (24) is installed in the space, and the axial connection structure is connected to the outer wall of the stator group (24) through a first circumferential locking structure. A second circumferential locking structure is provided between the outer wall of the upper cover (21) and / or the lower cover (22) and the outer wall of the stator group (24).

2. The self-priming pump with ultra-low water level according to claim 1, characterized in that, The axial connection structure includes at least two threaded rods (26). A threaded portion for threaded connection with the threaded rods (26) is provided on the upper cover (21) or the lower cover (22). The first circumferential locking structure includes a plurality of first positioning grooves (241) provided on the outer wall of the stator group (24), and at least a part of each threaded rod (26) is stuck in the first positioning groove (241).

3. The self-priming pump with ultra-low water level according to claim 1, characterized in that, The second circumferential locking structure includes a second positioning groove (242) and a positioning protrusion (211) that match each other. Either the second positioning groove (242) or the positioning protrusion (211) is provided on the upper cover (21), and the remaining one is provided on the outer wall of the stator group (24).

4. An ultra-low water level self-priming pump according to claim 1 or 2 or 3, characterized in that, An upper axial limiting structure is provided between the stator group (24) and the upper cover (21), and a lower axial limiting structure is provided between the stator group (24) and the lower cover (22).

5. The self-priming pump with ultra-low water level according to claim 4, characterized in that, The upper axial limiting structure includes an upper limiting step (212) provided on the inner wall of the lower end of the upper cover (21), and an upper limiting portion (243) that is stuck to the upper limiting step (212) is provided on the outer wall of the stator group (24). The lower axial limiting structure includes a lower limiting step (221) provided on the inner wall of the upper end of the lower cover (22), and a lower limiting portion (244) that is stuck to the lower limiting step (221) is provided on the outer wall of the stator group (24).

6. The self-priming pump with an ultra-low water level according to claim 1, characterized in that, The axial fixing structure includes an outwardly convex annular positioning groove (141) provided on the inner wall of the lower end of the water pump housing (1), and an outwardly convex annular portion (222) that is stuck in the outwardly convex annular positioning groove (141) is provided on the outer circumference of the lower cover (22). A sealing ring (15) is provided between the outer circumferences of the outwardly convex annular positioning groove (141) and the outwardly convex annular portion (222).

7. The self-priming pump with ultra-low water level according to claim 1, characterized in that The upper cover (21) includes a circular ring portion (213), and a plurality of arc-shaped support arms (214) with upper ends converging inward are connected to the circular ring portion (213). At least a part of the second circumferential locking structure is provided on the inner wall of the circular ring portion (213).

8. An ultra-low water level self-priming pump according to claim 1, characterized in that, The ultra-low water level self-priming pump further includes two non-contact liquid level sensors (4), and the two non-contact liquid level sensors (4) are arranged on a water level adjustment guide rail (5) on the outer wall of the water pump housing (1) through a position adjustment structure.

9. An ultra-low water level self-priming pump according to claim 8, characterized in that, The position adjustment structure includes a plurality of card slots (51) provided on both side walls of the water level adjustment guide rail (5), and elastic arm type buckles (41) provided on both side walls of the non-contact liquid level sensor (4), and the elastic arm type buckles (41) are clamped in any one of the card slots (51).

10. The self-priming pump with an ultra-low water level according to claim 9, characterized in that, A wire blocking buckle (6) is further provided on the water level adjustment guide rail (5), the wire blocking buckle (6) sleeved on at least part of both side walls of the water level adjustment guide rail (5), and a clamping portion is provided on the wire blocking buckle (6), and the clamping portion is clamped in any one of the card slots (51).

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