An ultra-low water level self-priming pump

Abstract

The present invention relates to the technical field of self-priming pumps, and specifically to an ultra-low water level self-priming pump, comprising a water pump housing having a water inlet and a water outlet, a motor and an impeller connected to the motor output shaft provided in the water pump housing, a lower cover connected to the housing via an axial fixing structure, and an upper cover connected to the lower cover via an axial connecting structure, and a space for accommodating the stator group of the motor is formed between the upper cover and the lower cover, the stator group being installed in the space and the axial connecting structure being connected to the outer wall of the stator group via a first circumferential locking structure, and a second circumferential locking structure being provided between the upper cover and / or the lower cover and the outer wall of the stator group. The present invention achieves efficient and stable operation under low water level conditions. The motor drives the impeller to generate centrifugal force to draw in and discharge liquid. The axial fixing structure and the circumferential locking structure ensure the stability of the motor stator group, thereby improving the overall reliability of the pump.

Description

Technical Field

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

[0002] Ultra-low water level self-priming pumps are widely used in agricultural irrigation, industrial water supply and other fields, especially in areas where water resources are scarce or water levels fluctuate greatly. Mechanical vibration is a common problem of all rotating equipment and can cause serious mechanical failure if not controlled.

[0003] When ultra-low-water self-priming pumps operate at extremely low water levels, mechanical vibrations are directly transmitted to various pump components, particularly the bearing housing and stator, due to the lack of sufficient water to buffer and absorb vibrations. Long-term mechanical vibrations can cause physical deformation and displacement of these critical components, reducing pump efficiency, increasing maintenance costs, and potentially causing downtime. Stator displacement can cause changes in the gap between the motor windings and the rotor, affecting the motor's electrical performance and thermal management. 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, comprising a water pump housing with a water inlet and a water outlet, a motor and an impeller connected to the output shaft of the motor are arranged in the water pump housing, a lower cover is connected to the housing via an axial fixing structure, and the lower cover is connected to an upper cover via an axial connecting structure, and a space for accommodating the motor and its stator group is formed between the upper cover and the lower cover, the stator group is installed in the space and the axial connecting structure is connected to the outer wall of the stator group via a first circumferential locking structure, and 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, the upper cover or the lower cover is provided with a threaded portion threadedly connected to the threaded rods, and the first circumferential locking structure includes a plurality of first positioning grooves provided on the outer wall of the stator assembly, and at least a portion of each of the threaded rods is clamped 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 any one of the second positioning groove and the positioning protrusion is provided on the upper cover, and the remaining one is provided on the outer wall of the stator assembly.

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

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

[0010] In some embodiments of the present application, the axial fixing structure includes an outwardly convex annular positioning groove provided at the lower end of the inner wall of the water pump housing, and an outwardly convex annular portion on the outer periphery of the lower cover that is clamped in the outwardly convex annular positioning groove, and a sealing ring is provided between the outwardly convex annular positioning groove and the outer periphery of 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 with their upper ends converging inward, and at least a portion of the second circumferential locking structure is arranged 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, which are arranged on a water level adjustment rail 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 slots arranged on the two side walls of the water level adjustment guide rail, and elastic arm type buckles arranged on the two side walls of the non-contact liquid level sensor, and the elastic arm type buckle is clamped in any of the slots.

[0014] In some embodiments of the present application, a wire stop buckle is further provided on the water level regulating guide rail, and the wire stop buckle is sleeved on at least a portion of the two side walls of the water level regulating guide rail, and a clamping portion is provided on the wire stop buckle, and the clamping portion is clamped in any of the clamping slots.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 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 to suck in and discharge 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 to the outer shell 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 various 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 to ensure that it does not move axially or radially during operation, ensuring the normal operation of the motor, and then ensuring the efficient operation of the self-priming pump under various complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0018] Figure 1 A schematic diagram of the three-dimensional structure of an ultra-low water level self-priming pump provided in an embodiment of the present invention;

[0019] Figure 2 A side view of an ultra-low water level self-priming pump provided by an embodiment of the present invention;

[0020] Figure 3 The embodiment of the present invention provides Figure 2 Cross-sectional view in the AA direction;

[0021] Figure 4 The embodiment of the present invention provides Figure 3 A partial enlarged view of point B in the middle;

[0022] Figure 5 An exploded view of a motor provided by an embodiment of the present invention;

[0023] Figure 6 The embodiment of the present invention provides Figure 1 A partial enlarged view of point C in the middle;

[0024] Figure 7 The embodiment of the present invention provides Figure 3 A partial enlarged view of point D in the middle.

[0025] In the figure: 1. Water pump housing; 100. Center through hole; 101. Lateral through hole; 12. Water outlet; 121. One-way 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 portion; 214. Arc-shaped support arm; 22. Lower cover; 221. Lower limit step; 222. Outer convex annular portion; 23. Motor output shaft; 230. Through portion; 231. Nut; 232. Diversion Arc surface; 24, stator assembly; 241, first positioning groove; 242, second positioning groove; 243, upper limit portion; 244, lower limit portion; 25, rotor assembly; 26, threaded rod; 30, center portion; 31, axial 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, slot; 6, wire stop buckle; 7, capacitor; 71, capacitor housing; 72, cantilever portion; 73, embedded conductive part; 8, external power cord; 81, conductive terminal. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying 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 to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0027] Example 1, see Figure 1-Figure 3 This embodiment provides an ultra-low water level self-priming pump, comprising a water pump housing 1 having a water inlet and a water outlet 12, a one-way valve 121 being provided in the water outlet 12, a motor being provided in the water pump housing 1, and an impeller 3 connected to an output shaft 23 of the motor, a lower cover 22 being connected in the housing via an axial fixing structure, and the lower cover 22 being connected to an upper cover 21 via an axial connecting structure, and a space for accommodating a stator group 24 of the power supply motor is formed between the upper cover 21 and the lower cover 22, the stator group 24 being installed in the space and the axial connecting structure is connected to the outer wall of the stator group 24 via 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.

[0028] It will be appreciated that in this embodiment, the water pump housing 1 is the main component of the entire self-priming pump. It has a water inlet and a water outlet 12 for guiding water into and out of the pump body. A motor is housed within the water pump housing 1, providing power to rotate the impeller 3 within the pump body, thereby achieving the pumping function. The impeller 3 is connected to the motor output shaft 23. When the motor is started, the impeller 3 rotates, generating centrifugal force that draws water in through the water inlet and discharges it through the water outlet 12. The lower cover 22 is connected to the housing via an axial fixing structure, while the upper cover 21 is connected to the lower cover 22 via an axial connection structure, ensuring stability and reliability between the components. The stator assembly 24 is mounted in the specific space formed between the upper and lower covers 21, 22. A first circumferential locking structure and a second circumferential locking structure, respectively, secure the outer wall of the stator assembly 24, preventing axial or radial movement during operation. This ensures the normal operation of the motor and, consequently, the efficient operation of the self-priming pump under various complex operating conditions.

[0029] Further, combined with Figure 5 As shown, the rotor assembly 25 of the motor is located within the stator assembly 24, and the rotor assembly 25 is connected to the upper cover 21 and the lower cover 22 via a rotating shaft. The rotating shaft is axially fixed to the upper cover 21 and the lower cover 22, and the rotating shaft can rotate relative to the upper cover 21 and the lower cover 22. A communication channel is provided on the water pump housing 1, connecting the water inlet and the water outlet 12, and the impeller 3 is located at the water inlet.

[0030] It will be appreciated that in this embodiment, the rotor assembly 25 is located within the stator assembly 24 and generates rotational motion through the principle of electromagnetic induction. The stator assembly 24 provides a fixed magnetic field, and the rotor assembly 25 rotates within the magnetic field, thereby achieving energy conversion. The rotating shaft transmits the rotational motion of the rotor assembly 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 assembly 25. The upper cover 21 and the lower cover 22 not only protect the internal components of the motor, but also serve to fix the rotating shaft, ensuring that the rotating shaft remains stable during operation and preventing axial movement, thereby ensuring the efficient operation of the motor.

[0031] It is understood that the communication channel on the water pump housing 1 connects the water inlet and the water outlet 12, allowing water to flow smoothly. When the motor drives the shaft to rotate, the impeller 3 also rotates, using centrifugal force to draw water from the water inlet and accelerate it, and finally discharge it through the communication channel, realizing the pumping function.

[0032] Furthermore, the axial connection structure includes at least two threaded rods 26, a threaded portion threadedly connected to the threaded rods 26 is provided on the upper cover 21 or the lower cover 22, and the first circumferential locking structure includes a plurality of first positioning grooves 241 provided on the outer wall of the stator assembly 24, and at least a portion of each threaded rod 26 is clamped in the first positioning groove 241.

[0033] It will be appreciated that in this embodiment, the threaded portion provided on the upper cover 21 or lower cover 22 cooperates with the threaded rod 26 to achieve fixation and adjustment functions through a 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, preventing loosening or falling due to vibration or other external forces, and further maintaining the stability of the overall structure. The stator assembly 24, as the stationary part of the device, has a first positioning groove 241 on its outer wall that cooperates with the threaded rod 26 to achieve circumferential locking of the stator assembly 24, while effectively dispersing stress, reducing wear, and improving the service life and reliability of the structure.

[0034] The stator assembly 24 includes a skeleton coil body and an annular member fixed to the circumference of the skeleton coil body. A first positioning groove 241 is provided in the axial direction of the outer wall of the annular member. The annular member is fixed to the center of the skeleton coil body using a plurality of fasteners. The threaded rod 26 and the first positioning groove 241 also cooperate to dissipate heat.

[0035] 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 assembly 24. The positioning protrusion 211 is partially inserted into the second positioning groove 242, which can also be used for heat dissipation.

[0036] It will be appreciated that the second circumferential locking structure in this embodiment is used to limit the circumferential rotation of the stator assembly 24, preventing unnecessary movement of the stator assembly 24 due to vibration or external forces, thereby ensuring the normal operation of the motor. This embodiment secures the stator assembly 24 through the interaction between the second positioning groove 242 and the positioning protrusion, thereby improving the operating efficiency of the motor and extending its service life.

[0037] Furthermore, an upper axial limiting structure is provided between the stator assembly 24 and the upper cover 21 , and a lower axial limiting structure is provided between the stator assembly 24 and the lower cover 22 .

[0038] Furthermore, the upper axial limiting structure includes an upper limit 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 limit portion 243 that is locked in the upper limit step 212; the lower axial limiting structure includes a lower limit 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 limit portion 244 that is locked in the lower limit step 221.

[0039] 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 are mechanically matched to fix the stator group 24 in the upper and lower directions to ensure that it will not undergo axial displacement due to vibration or other external forces during operation.

[0040] Furthermore, the axial fixing structure includes an outward convex annular positioning groove 141 provided at the lower end of the inner wall of the water pump housing 1, and an outward convex annular portion 222 on the outer periphery of the lower cover 22 that is clamped in the outward convex annular positioning groove 141, and a sealing ring 15 is provided between the outer periphery of the outward convex annular positioning groove 141 and the outer periphery of the outward convex annular portion 222.

[0041] It can be understood that the axial fixing structure in this embodiment is achieved by inserting the outer convex annular portion 222 of the lower cover 22 into the outer convex annular positioning groove 141 on the inner wall of the water pump housing 1, and arranging a sealing ring 15 in the outer convex annular positioning groove 141. Through the cooperation of the outer convex annular positioning groove 141 and the outer convex annular portion 222, the lower cover 22 is accurately fixed in the axial direction; 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.

[0042] Furthermore, the upper cover 21 includes a circular portion 213 , and a plurality of arc-shaped support arms 214 connected to the circular portion 213 , with upper ends converging inwardly. At least a portion of the second circumferential locking structure is disposed on the inner wall of the circular portion 213 .

[0043] It can be understood that in this embodiment, the annular portion 213 and the arc-shaped support arm 214 provide multi-level support and protection, and the second circumferential locking structure is at least partially arranged on the inner wall of the annular portion 213 to enhance the overall stability of the structure and prevent loosening or displacement.

[0044] Further, combined with Figure 1-Figure 3 and Figure 6 As shown, the ultra-low water level self-priming pump also includes two non-contact liquid level sensors 4, which are arranged on the water level adjustment 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 slots 51 provided on the side walls of the water level adjustment rail 5, and elastic arm-type clips 41 provided on the side walls of the non-contact liquid level sensors 4, and the elastic arm-type clips 41 are fixed in any of the slots 51. The position adjustment structure also includes a sliding portion and a chute that cooperate with each other. The chute is provided between the side walls of the water level adjustment rail 5, and the sliding portion is provided on the non-contact liquid level sensor 4.

[0045] It will be appreciated that in this embodiment, the non-contact liquid level sensor 4 is mounted on the water level adjustment rail 5, and the specific installation position of the non-contact liquid level sensor 4 is adjusted via a position adjustment structure to accommodate varying water level requirements. The position adjustment structure, through the coordination of the spring-loaded clip 41 and the optional slot 51, allows the user to adjust and secure the sensor's position as needed. Furthermore, the position adjustment structure includes a cooperating sliding portion and a chute. The coordination of the sliding portion and the chute provides guidance and a limit function when adjusting the specific position of the non-contact liquid level sensor 4, ensuring that it does not deviate from the predetermined track during adjustment, thereby reducing the risk of operational errors.

[0046] 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 positions corresponding to the starting water level and the stopping water level. When the water level reaches the starting water level, the water pump starts, and when the water level reaches the stopping water level, the water pump stops. The starting water level height and the stopping water level height can be freely adjusted through the position adjustment structure.

[0047] Furthermore, a wire stop buckle 6 is provided on the water level regulating guide rail 5 , which is sleeved on at least part of the two side walls of the water level regulating guide rail 5 , and a clamping portion is provided on the wire stop buckle 6 , which is clamped in any clamping slot 51 .

[0048] It can be understood that the clamping portion of the wire retaining buckle 6 in this embodiment cooperates with the clamping groove 51 of the water level regulating guide rail 5, which can be easily installed and disassembled while ensuring the stability of the buckle.

[0049] Further, combined with Figure 3-4 As shown, an upper cover reinforcement assembly is provided between the inner top of the water pump housing 1 and the top of the upper cover 21, and the upper cover reinforcement assembly includes a capacitor housing 71, a fastener, a cantilever portion 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 limitations at both ends of 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.

[0050] Furthermore, 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, with a gap 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 by a fastener. A plurality of conductive terminals 81 with their lower ends extending into the capacitor accommodation chamber 16 are embedded in the top of the water pump housing 1. A cantilever portion 72 is provided on the other side of the top of the capacitor housing 71, 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 with a nut pressed on the upper end of the threaded hole.

[0051] Specifically, the external power line 8 provides power to the capacitor 7, and the capacitor 7 transmits the power to the motor through the electrical connection, so that the motor can operate normally.

[0052] Furthermore, an embedded conductive member 73 electrically connected to the capacitor 7 is embedded in the wall of the capacitor housing 71. The conductive terminal 81 directly abuts the exposed portion of the embedded conductive member 73 to facilitate the conductive connection. The exposed portion and the conductive terminal 81 are reinforced with conductive adhesive. The conductive terminal 81 is cylindrical.

[0053] It is understood that in this embodiment, the capacitor housing 71 is securely fixed by simply abutting the conductive terminals 81 against the cantilever portion 72 and connecting it to the upper cover 21 with a single fastener. Conventional fastening methods typically rely on multiple fasteners, increasing cost and complexity. This embodiment not only reduces material and labor costs, but also simplifies the installation process, significantly improving production efficiency.

[0054] Furthermore, the water pump housing 1 includes a base 14 and a top cover 13. At least a portion of the outer convex annular positioning groove 141 is located on the inner wall of the lower cover 22, with the remaining portion located on the inner wall of the top cover 13. First, the motor, upper cover 21, and lower cover 22 are assembled and placed on the base 14. The sealing ring 15 is then positioned so that the outer convex annular portion 222 of the lower cover 22 and the sealing ring 15 are located within at least a portion of the outer convex annular positioning groove 141. The top cover 13 and base 14 are then combined and securely connected using fasteners. The combination of the outer convex annular positioning portion and the outer convex annular positioning groove 141 further secures the motor, upper cover 21, and lower cover 22 in the axial direction, enhancing the stability and safety of the overall structure.

[0055] The working principle of this embodiment is as follows:

[0056] After the motor is powered on, the motor drives the impeller 3 to rotate, and water enters from the water inlet and is discharged from the water outlet 12. The stator assembly 24 of the motor is fixed, while the rotor assembly 25 rotates and drives the impeller 3 to rotate.

[0057] Example 2, based on Example 1, as Figure 7As shown, this embodiment further discloses the following contents: a central portion 30 extending toward the water inlet side is provided at the center position of the impeller 3, an axial hole 31 is provided axially of the central portion 30, and enlarged holes 32 are respectively provided at the upper and lower ends of the axial hole 31, the lower end of the motor output shaft 23 is inserted into the upper enlarged hole 32 and the lower end of the motor output shaft 23 is connected with a through portion 230 passing through the axial hole 31 and the other enlarged hole 32, a nut member 231 is threadedly connected to the through portion 230 and is at least partially located in the other enlarged hole 32, and an annular cylinder 33 extending toward the water inlet is provided at the lower end of the impeller 3, the through portion 230 extends into the annular cylinder 33, and a guide arc surface 232 is provided at the lower end of the outer wall of the nut member 231.

[0058] The water inlet includes a central through hole 100 and several 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 form a drainage on a plane perpendicular to the axis of the central through hole 100 for the water flow entering the central through hole 100. In summary, the above structure can accelerate the drainage of water at the water inlet into the impeller 3 to improve efficiency.

[0059] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0060] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0061] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0062] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0063] 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 it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. An ultra-low water level self-priming pump, comprising a water pump housing (1) having a water inlet and a water outlet (12), a motor provided in the water pump housing (1), and an impeller (3) connected to an output shaft (23) of the motor, characterized in that: A lower cover (22) is connected to the water pump housing (1) via an axial fixing structure, and the lower cover (22) is connected to an upper cover (21) via an axial connecting structure, and 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 connecting structure is connected to the outer wall of the stator group (24) via 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); an upper cover reinforcement assembly is provided between the inner top of the water pump housing (1) and the top of the upper cover (21); The axial fixing structure comprises an outer convex annular positioning groove (141) provided at the lower end of the inner wall of the water pump housing (1), and an outer convex annular portion (222) is provided on the outer periphery of the lower cover (22) and is clamped in the outer convex annular positioning groove (141), and a sealing ring (15) is provided between the outer periphery of the outer convex annular positioning groove (141) and the outer periphery of the outer convex annular portion (222); the water pump housing (1) comprises a base (14) and a top cover (13), at least a portion of the outer convex annular positioning groove (141) is located on the inner wall of the lower cover (22), and the remaining portion is located on the inner wall of the top cover (13), and the top cover (13) and the base (14) are fixedly connected by fasteners.

2. The ultra-low water level self-priming pump according to claim 1, characterized in that: 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 rods (26), and the first circumferential locking structure includes a plurality of first positioning grooves (241) provided on the outer wall of the stator assembly (24), and at least a portion of each threaded rod (26) is clamped in the first positioning groove (241).

3. The ultra-low water level self-priming pump according to claim 1, characterized in that: The second circumferential locking structure comprises a second positioning groove (242) and a positioning protrusion (211) that match each other, wherein 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 assembly (24).

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

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

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

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

8. The ultra-low water level self-priming pump according to claim 7, characterized in that: The position adjustment structure comprises a plurality of 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), wherein the elastic arm-type buckle (41) is clamped in any of the slots (51).

9. The ultra-low water level self-priming pump according to claim 8, characterized in that: The water level regulating guide rail (5) is further provided with a line retaining buckle (6), which is sleeved on at least a portion of the two side walls of the water level regulating guide rail (5), and a clamping portion is provided on the line retaining buckle (6), which is clamped in any one of the clamping slots (51).

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