Water pump and pet water dispenser with same

Abstract

The utility model discloses a water pump which is small in size, light in weight and low in material consumption and a pet water dispenser with the water pump. Comprising a cylindrical wheel sleeve, a hollow cavity is formed in the cylinder, the bottom end face of the cylinder is an opening communicated with the hollow cavity, and a plurality of blades are arranged on the top end face of the cylinder. A plurality of N magnetic poles and S magnetic poles are evenly distributed in the circumferential direction of the wheel sleeve at intervals, and every two adjacent magnetic poles are opposite magnetic poles. The rotor assembly of the water pump is only one part, and the wheel sleeve of the rotor assembly is buckled on the stator assembly, so that magnetic coupling energy transfer between the rotor assembly and the stator assembly can be realized. The stator assembly only comprises one coil and two magnetic conductive plates, and the overall size of the stator assembly formed by the coil and the magnetic conductive plates is small. When the rotor assembly and the stator assembly are installed outside the water storage tank and the water storage tank respectively, water and electricity of the rotor assembly and water and electricity of the stator assembly can be separated, and when the water storage tank is cleaned, the rotor can be easily and independently taken out to be cleaned.

Description

Technical Field

[0001] The utility model relates to a water pump with water and electricity separation, in particular to a centrifugal pump used in a pet drinking fountain. Background Art

[0002] Nowadays, more and more people like to keep small animals, especially cats and dogs. In order to provide small pets with clean water, pet drinking fountains came into being.

[0003] Pet drinking fountains are generally composed of a water tank, a water tray, a water supply pipe, a water pump, a water filter and a control circuit. The water pump injects clean water from the water tank into the water tray through the water supply pipe, and excess water in the water tray flows back to the water tank through the overflow port and the water filter.

[0004] In the prior art, in order to separate the rotor assembly and stator assembly of the water pump from each other in order to avoid short circuit caused by long-term use of the stator assembly with coils, the stator assembly is installed outside the water tank and the rotor assembly is installed inside the water tank. For example, the Chinese utility model patent "Pet Drinking Machine" (patent number: 201822188946.1) discloses a water pump used in a pet drinking machine, in which the rotor assembly and stator assembly of the water pump are separated from each other in terms of water and electricity. Although the stator assembly is arranged outside the water tank and the rotor assembly placed in the water tank is rotated by a magnetic coupling structure, it still has the following shortcomings:

[0005] 1) In order to ensure normal magnetic coupling between the impeller and the stator assembly in the rotor assembly, a magnetic ring needs to be embedded on the inner wall of the impeller, that is, the combination of two components is required, and the production and assembly are relatively cumbersome.

[0006] 2) The stator assembly has a complex structure, consisting of multiple sets of coils and multiple peripheral components, and has a high manufacturing cost. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a water pump with small volume, light weight and less material consumption, and a pet drinking fountain with the water pump.

[0008] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0009] The utility model discloses a water pump for a pet water dispenser, comprising a rotor and a stator, and is characterized in that: the rotor is a water pump impeller formed by injection molding of a magnetic material and a plastic material into an integral structure, the water pump impeller comprises a cylindrical wheel sleeve, the top end surface of the wheel sleeve is a closed surface with a central hole, the inside of the cylinder is a hollow cavity, the bottom end surface is an opening communicated with the hollow cavity, a plurality of blades are arranged on the top end surface, a plurality of N magnetic poles and S magnetic poles are evenly distributed along the circumference of the wheel sleeve, two adjacent magnetic poles are opposite magnetic poles, a shaft sleeve hole that matches the hollow cavity is arranged at a central position on the top end surface of the wheel sleeve, and a hole wall extending upward is arranged around the shaft sleeve hole.

[0010] The stator is composed of a skeleton, a coil wound on the skeleton, a magnetic sleeve and a magnetic plate. The winding plane of the coil is perpendicular to the axis of the skeleton. The magnetic sleeve is placed in the central through hole of the skeleton. The magnetic plate is divided into an upper magnetic plate and a lower magnetic plate. The upper magnetic plate and the lower magnetic plate have the same shape and are both composed of a base plate and a plurality of bent plates. The base plate and the bent plates are integrally structured and perpendicular to each other. The number of bent plates on the upper magnetic plate and the lower magnetic plate is the same. The upper magnetic plate and the lower magnetic plate are respectively placed above and below the coil. The base plates of the two magnetic plates are opposite to each other up and down. The plurality of bent plates are distributed along the periphery of the coil. The bent plates on the upper magnetic plate are adjacent to and spaced apart from the bent plates on the lower magnetic plate.

[0011] The stator is embedded in the hollow cavity, and an isolation layer plate that can water-seal the rotor and the stator is provided between the stator and the inner wall of the hollow cavity, and the outer edge of the isolation layer plate extends out of the hollow cavity and extends to the surrounding areas along the bottom edge of the wheel sleeve; a central axis is provided on the top surface of the isolation layer plate in the hollow cavity, and a shaft sleeve hole that can be placed on the central axis is provided on the inner top surface of the hollow cavity, and a central bearing is installed in the shaft sleeve hole.

[0012] A base plate is provided between the periphery of the stator and the inner side wall of the isolation plate to facilitate lifting the isolation plate and the rotor away from the stator. The outer edge of the base plate extends out of the hollow cavity and extends around the top of the stator.

[0013] The number of the bending plates is the same as the number of the magnetic poles on the wheel sleeve.

[0014] The length of the bending plate is smaller than the distance between the two base plates of the upper magnetic plate and the lower magnetic plate, and the front end of the bending plate is asymmetrical along the circumference of the coil.

[0015] The pet drinking fountain of the utility model comprises a water storage tank, a drinking tray and a water pump for pumping water in the water storage tank into the drinking tray. The feature of the water pump is the water pump used in the pet drinking fountain of the utility model.

[0016] The rotor of the water pump is placed on a boss protruding upward on the bottom plate in the water tank, a central axis is provided on the top surface of the boss, a sleeve hole which can be placed on the central axis is provided on the inner top surface of the hollow cavity of the rotor wheel sleeve, a vertically arranged water delivery pipe is buckled on the rotor, the upper end opening of the water delivery pipe is connected to the water outlet of the water drinking tray, a water cavity is provided at the bottom of the water delivery pipe, a water inlet hole which can suck water in the water storage tank into the water cavity and a water outlet hole which discharges the water in the water cavity into the water delivery pipe under the rotation of the impeller.

[0017] A base is also provided under the water storage tank, and a stator shell is provided on the base at a position corresponding to the upper and lower positions of the boss. The stator shell carries the stator and is inserted upward into an inner cavity provided at the bottom of the boss.

[0018] The rotor of the water pump is placed on a boss protruding upward on the bottom plate in the water tank, a central axis is provided on the top surface of the boss, a shaft sleeve hole which can be placed on the central axis is provided on the inner top surface of the hollow cavity of the rotor wheel sleeve, a water filter cartridge is provided above the rotor, a water outlet at the upper end of the water filter cartridge is connected to the nozzle on the water drinking tray, a structure which can be buckled on the rotor and can form a rotor wheel cavity is provided at the bottom of the water filter cartridge, a water inlet hole which can suck water in the water storage cavity into the rotor wheel cavity and a water outlet hole which discharges water in the rotor wheel cavity upward into the water filter cartridge when the rotor rotates are provided on the structure.

[0019] The rotor assembly of the water pump of the utility model is only one component, which is made of magnetic material and plastic material through injection molding to form a component with an integrated structure of blades and impeller sleeves. A plurality of magnetic poles are arranged on the peripheral wall of the sleeve at intervals. The sleeve is buckled on the stator assembly to realize the magnetic coupling energy transfer therebetween. The stator assembly of the utility model only includes one coil and two magnetic conductive plates, and the stator assembly composed of them has a small overall volume. When the rotor assembly and the stator assembly are respectively installed in the water storage tank and outside the water storage tank, not only can the rotor assembly and the stator assembly be separated by water and electricity, but also when the water storage tank is cleaned, it is easy to take out the rotor separately for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the water pump rotor of the utility model.

[0021] Figure 2 for Figure 1 AA section view.

[0022] Figure 3 It is a schematic diagram of the water pump stator assembly of the utility model.

[0023] Figure 4 for Figure 3 BB section view.

[0024] Figure 5 for Figure 3 Schematic diagram of the decomposition.

[0025] Figure 6 for Figure 5 Schematic diagram of the exploded view of the stator 3.

[0026] Figure 7 for Figure 6 Cross-sectional view of the magnetic sleeve in FIG.

[0027] Figure 8 The utility model is a schematic diagram of a pet drinking fountain with a water pump.

[0028] Fig. 9 for Figure 8 CC-direction stereoscopic sectional view.

[0029] Fig.10 for Figure 8 CC plane cross-sectional view.

[0030] Fig.11 for Fig.10 Enlarged schematic diagram of part D in the middle.

[0031] The reference numerals are as follows:

[0032] Rotor 1, wheel sleeve 11, blade 12, hollow cavity 13, sleeve hole 14, center bearing 15, stator housing 2, stator cavity 21, mounting side plate 22, stator 3, skeleton 31, coil 32, wire rack disc 33, positioning short column 331, magnetic block 332, magnetic sleeve 34, magnetic plate 35 、 Base plate 351, central plate 352, support plate 353, bending plate 354, water storage tank 4, water tray 41, nozzle 42, bottom plate 43, boss 431, inner cavity 432, central axis 433, water filter cartridge 5, water outlet 51, rotor wheel cavity 52, water inlet hole 521, water outlet hole 522, base 6. DETAILED DESCRIPTION

[0033] like Figure 1-7 As shown, the water pump used in the pet drinking fountain of the utility model is composed of a rotor assembly and a stator assembly.

[0034] 1. Rotor assembly

[0035] like Figure 1 , 2As shown, it is only a water pump impeller (i.e., rotor 1) of an integral structure made by injection molding of magnetic material and plastic material, the water pump impeller comprises a wheel sleeve 11 which is cylindrical and has a closed surface with a central hole on the top surface, and a plurality of blades 12 arranged on the top surface of the wheel sleeve 11, the outer diameter of the wheel sleeve 11 is preferably 2.0cm-5.0cm, the side wall height of the wheel sleeve 11 is preferably 0.4cm-2.5cm, preferably 1.0cm, the side wall thickness of the wheel sleeve 11 is preferably 1.0mm-3.0mm, the wheel sleeve 11 tube is a hollow cavity 13, the bottom end surface of the wheel sleeve 11 is an opening communicating with the hollow cavity 13, a shaft sleeve hole 14 communicating with the hollow cavity 13 is provided in the center of the top end surface of the wheel sleeve 11, the periphery of the shaft sleeve hole is provided with a hole wall extending upward to facilitate the centering of the center shaft 433 inserted therein, and a center bearing 15 is provided in the shaft sleeve hole 14.

[0036] The side wall of the wheel sleeve 11 is evenly spaced along its circumferential direction to present a plurality of magnetic pole segments, and two adjacent magnetic pole segments are opposite magnetic poles, that is, of the two adjacent magnetic pole segments, one is an N magnetic pole and the other is an S magnetic pole.

[0037] The rotor 1 is placed upside down on the stator assembly, and the rotor 1 can rotate when the stator assembly is energized and an alternating magnetic field is generated.

[0038] The above design has fewer parts, lower manufacturing cost, better magnetic coupling effect and is convenient for cleaning and maintaining the rotor 1 .

[0039] 2. Stator assembly

[0040] like Figure 3-7 As shown, it is composed of a stator 3 and a stator housing 2. The stator 3 is composed of a skeleton 31, a wire frame disk 33, a coil 32, a magnetic conductive sleeve 34 and a magnetic conductive plate 35. The wire frame disk 33 is two, respectively called an upper magnetic conductive plate and a lower magnetic conductive plate. The magnetic conductive plates 35 are also two, respectively called an upper magnetic plate and a lower magnetic plate.

[0041] 1) The skeleton 31 is cylindrical and made of insulating non-magnetic material. The coil 32 is wound on the circumferential wall of the skeleton 31 .

[0042] 2) The wire rack disk 33 comprises an upper magnetic conductive plate and a lower magnetic conductive plate respectively arranged on the upper and lower sides of the coil 32 and made of magnetic conductive material. The two plates have the same structure and shape. A plurality of magnetic conductive blocks 332 extending outward (away from the axis of the coil 32) from the coil 32 are arranged along their peripheries, and a short gap is formed between two adjacent magnetic conductive blocks 332 on the same plate.

[0043] The number of magnetic blocks 332 on the two plates is the same. When the two plates are installed on the frame 31, the magnetic blocks 332 on the upper magnetic plate and the lower magnetic plate are staggered in the circumferential direction of the coil 32. The magnetic blocks 332 on the upper magnetic plate are opposite to the notches on the lower magnetic plate, and the notches on the upper magnetic plate are opposite to the magnetic blocks 332 on the lower magnetic plate.

[0044] A plurality of positioning studs 331 are respectively provided on the upper surface of the upper magnetic conductive plate and the lower surface of the lower magnetic conductive plate. Preferably, the number of positioning studs 331 on the upper magnetic conductive plate is different from the number of positioning studs 331 on the lower magnetic conductive plate. This arrangement can accurately install the upper magnetic plate and the upper magnetic conductive plate, and the lower magnetic plate and the lower magnetic conductive plate in place when the upper magnetic plate and the lower magnetic plate are respectively fixed on the upper magnetic conductive plate and the lower magnetic conductive plate, thereby playing a role in foolproof installation.

[0045] 3) Coil 32 and magnetic sleeve 34

[0046] There is one coil 32 , which is wound with conventional enameled wire as required, and the turn plane of the coil 32 is parallel to the wire rack disk 33 .

[0047] The magnetic sleeve 34 is made of magnetic conductive material and installed in the through hole of the frame 31. It is a hollow sleeve with an open upper or lower end surface and a closed end surface. Preferably, the upper end surface is open and the lower end surface is closed.

[0048] The upper edge of the magnetic sleeve 34 contacts the upper magnetic plate, and the lower end contacts the lower magnetic plate. The contact gap between them is as small as possible to minimize magnetic gap leakage after the coil 32 is energized.

[0049] 4) Magnetic plate 35

[0050] It is made of magnetic conductive material, and is composed of the upper magnetic plate and the lower magnetic plate. The upper magnetic plate and the lower magnetic plate have the same shape, and are both composed of a base plate 351 and a plurality of bent plates 354. The upper magnetic plate is provided with positioning holes having the same number as the positioning short posts 331 on the upper magnetic conductive flat plate. Similarly, the lower magnetic plate is provided with positioning holes having the same number as the positioning short posts 331 on the lower magnetic conductive flat plate.

[0051] The base plate 351 is composed of a circular central plate 352 and a plurality of support plates 353 which are spaced apart and extend in all directions from the central plate 352. The bent plate 354 is arranged at the outer end of the support plate 353. The central plate 352 and the support plate 353 are in the same plane. The bent plate 354 is perpendicular to the base plate 351. The central plate 352, the support plate 353 and the bent plate 354 are an integral structure. The number of bent plates 354 on the upper magnetic plate and the lower magnetic plate is the same. The plurality of bent plates 354 are spaced apart and distributed along the periphery of the coil 32. The total number of the bent plates 354 is the same as the total number of magnetic poles on the wheel sleeve 11.

[0052] The upper magnetic plate is mounted on the upper magnetic conductive flat plate in a close contact manner. Similarly, the lower magnetic plate is mounted on the lower surface of the lower magnetic conductive flat plate in a close contact manner. The base plates 351 of the two magnetic plates are opposite to each other up and down.

[0053] When the upper magnetic plate and the lower magnetic plate are installed, the bent plate 354 on the upper magnetic plate faces a corresponding magnetic block 332 on the lower magnetic flat plate, leaving a certain gap (hereinafter referred to as the magnetic gap) between them, and the bent plate 354 on the lower magnetic plate faces a corresponding magnetic block 332 on the upper magnetic flat plate, leaving a certain gap between them.

[0054] When the coil 32 is energized, the magnetic field generated by the coil 32 circulates in the magnetic circuit formed by the magnetic sleeve 34, the wire rack disk 33, the base plate 351, the bent plate 354, the magnetic gap and the magnetic block 332, and the magnetic poles presented on the bent plate 354 of the upper magnetic plate and the bent plate 354 of the lower magnetic plate are exactly opposite, so that they are arranged opposite to the magnetic pole segments on the side wall of the rotor sleeve 11, and when the magnetic poles on the bent plate 354 are misaligned with the magnetic poles on the wheel sleeve 11, the rotor 1 can be rotated. When the magnetic poles on the bent plate 354 and the magnetic poles on the wheel sleeve 11 are about to be opposite to each other in the same polarity during the rotation of the rotor 1, the Hall sensor for collecting the magnetic pole position on the rotor 1 transmits the collected signal to the control circuit, and the control circuit sends an instruction to change the direction of the excitation current to the coil 32, so that the coil 32 continuously generates a reverse magnetic field to change the magnetism on the bent plate 354, and the cycle is repeated. Under the action of the alternating magnetic field continuously generated by the coil 32 and the rotational inertia of the rotor 1, the rotor 1 is continuously rotated in one direction.

[0055] The front end portion of the bending plate 354 (i.e., the end opposite to the magnetic block 332) is asymmetrical in shape along the circumference of the coil 32, and is preferably a chamfered structure, which facilitates the rotation of the rotor 1 after the coil 32 is energized.

[0056] 5) The stator housing 2 is made of non-magnetic material and consists of a stator cavity 21 and a mounting side plate 22. The stator 3 is fixed in the stator cavity 21 in an embedded manner, and mounting screw holes are provided on the mounting side plate 22.

[0057] 3. Assembly of rotor 1 and stator assembly

[0058] The water pump of the utility model is mainly used in a pet water dispenser, wherein the rotor 1 is arranged in a water tank 4 of the pet water dispenser, and the stator assembly is arranged outside the water tank 4. The rotor 1 is separated from the stator assembly by water and electricity, so as to completely avoid the problem that the stator assembly is sealed with glue and then placed in water for a long time, resulting in aging of the stator assembly sealing glue and short circuit, as well as difficulty in maintenance.

[0059] When the rotor 1 of the utility model is assembled with the stator assembly for use, a water-tight isolation layer made of non-magnetic material is first arranged in the hollow cavity 13 of the rotor 1. The isolation layer can be the bottom plate 43 of the water tank 4 of the pet drinking fountain (that is, the outer edge of the isolation layer extends out of the hollow cavity 13 and extends to the surroundings along the bottom edge of the wheel sleeve 11). Then, the stator assembly is installed in the hollow cavity 13 in an embedded manner so that the bent plate 354 on the stator 3 is opposite to the side wall of the rotor 1 wheel sleeve 11. This arrangement can achieve water sealing between the stator assembly and the rotor 1, and at the same time does not affect the magnetic coupling structure between the stator assembly and the rotor 1.

[0060] A central shaft 433 is provided on the top end surface of the isolation layer plate in the hollow cavity 13 , and a central bearing 15 in the shaft sleeve hole 14 of the rotor 1 is sleeved on the central shaft 433 .

[0061] This structure can conveniently remove the rotor 1 from the isolation layer when cleaning the rotor 1 .

[0062] Furthermore, in order to facilitate the removal of the rotor 1 and the isolation layer plate from the stator assembly as a whole, a base layer plate made of non-magnetic material can be provided under the isolation layer plate. The base layer plate is equivalent to the base 6 provided under the water tank 4 of the pet drinking fountain (that is, the outer edge of the base layer plate extends out of the hollow cavity 13 and extends to the surrounding areas along the top plane of the stator 3).

[0063] A through hole is opened in the area of ​​the base layer plate opposite to the hollow cavity 13, and a cylindrical wall extending upward may also be provided around the through hole (of course, the cylindrical wall may not be provided, and the stator housing may be directly inserted into the through hole, so that the magnetic gap between the stator and the rotor can be reduced). The stator housing 2 can be inserted into the through hole, and the mounting side plate 22 of the stator housing 2 is fixed to the base layer plate by screws, and the bent plate 354 of the stator 3 in the stator housing 2 is opposite to the magnetic pole on the side wall of the rotor 1 wheel sleeve 11.

[0064] This structure can conveniently remove the water tank 4 and the rotor 1 from the base plate when cleaning the rotor 1 and the water tank 4.

[0065] 4. Pet water dispenser of the utility model

[0066] It comprises a water storage tank 4, a water drinking tray 41 and a water pump for pumping water in the water storage tank 4 into the water drinking tray 41. The water pump is the water pump used in the pet drinking fountain mentioned above in the utility model.

[0067] The pet drinking fountains using the water pump of the utility model are preferably the following two types:

[0068] 1) If Figure 8-11As shown, a boss 431 protruding upward and integrally formed with the bottom plate 43 for mounting the rotor 1 is provided in the center of the bottom plate 43 (made of non-magnetic material) in the water tank 4, and a center shaft 433 is provided on the top surface of the boss 431. The rotor 1 is buckled on the boss 431, and the center shaft 433 is inserted into the shaft sleeve hole 14 on the rotor 1. An inner hollow cavity 432 is provided upward from the outer side of the bottom of the boss 431.

[0069] A water filter cartridge 5 is provided on the rotor 1, and a water outlet 51 at the upper end of the water filter cartridge 5 is connected to the nozzle 42 on the water drinking tray 41. A structure that can be buckled on the rotor 1 and can form a rotor wheel cavity 52 is provided at the bottom of the water filter cartridge 5. The structure is provided with a water inlet hole 521 that can suck water in the water storage cavity into the rotor wheel cavity 52 and a water outlet hole 522 that discharges the water in the rotor wheel cavity 52 upward into the water filter cartridge 5 when the rotor 1 rotates.

[0070] A base 6 (made of non-magnetic material) is also provided under the water tank 4. A through hole is provided on the base 6 at positions corresponding to the upper and lower positions of the boss 431. The periphery of the through hole is provided with a hole wall extending upward. The stator housing 2 carries the stator 3 and is inserted upward into the through hole and placed in the inner hollow cavity 432.

[0071] The water filter cartridge 5 is filled with filtering materials, such as activated carbon and ion exchange resin, to play a secondary filtering role. The water filter cartridge 5 is also provided with a primary filtering material outside.

[0072] 2) Not shown in the figure, a boss 431 which protrudes upward and is an integral structure with the bottom plate 43 for mounting the rotor 1 is provided in the center of the bottom plate 43 in the water tank 4, a center axis 433 is provided on the top surface of the boss 431, the rotor 1 is buckled on the boss 431, the center axis 433 is inserted into the shaft sleeve hole 14 on the rotor 1, and an inner hollow cavity 432 is provided upward from the outer side of the bottom of the boss 431.

[0073] A vertically arranged water supply pipe is buckled on the rotor 1, and the upper end opening of the water supply pipe is connected to the water outlet 51 of the water drinking tray 41 and the nozzle 42 on the water drinking tray 41. A water cavity is provided at the bottom of the water supply pipe, and the water cavity is provided with a water inlet hole 521 that can suck water from the water storage tank 4 into the water cavity and a water outlet hole 522 that discharges the water in the water cavity upward into the water supply pipe under the rotation of the rotor 1.

[0074] A base 6 is also provided under the water tank 4, and a through hole is provided on the base 6 at positions corresponding to the upper and lower positions of the boss 431. The periphery of the through hole is provided with a hole wall extending upward, and the stator housing 2 carrying the stator 3 is inserted upward into the through hole and placed in the inner hollow cavity 432.

[0075] Working state description of the pet drinking fountain of the utility model:

[0076] When the user adds water to the water tank 4 and starts the water pump, the rotor 1 will rotate with the magnetic field generated by the stator 3, thereby driving the water to rotate. The water in the water tank 4 is sucked into the rotor wheel cavity 52 (water cavity) through the water inlet hole 521 and is sent into the water filter cartridge 5 or the water supply pipe through the water outlet hole 522, and finally injected into the drinking tray 41 through the nozzle 42 for the pet to drink.

[0077] When the user needs to clean the internal parts of the water storage tank 4, he can remove the water tray 41, take out the water filter cartridge 5 or the water delivery pipe, and directly take out the impeller for cleaning. In addition, the water storage tank 4 can be completely removed from the base 6 without disassembling the stator assembly installed on the base 6, which is very convenient.

Claims

1. A water pump for a pet drinking fountain, comprising a rotor (1) and a stator (3), characterized in that: The rotor (1) is a water pump impeller made of magnetic material and plastic material by injection molding and having an integral structure. The water pump impeller comprises a cylindrical wheel sleeve (11). The top end surface of the wheel sleeve (11) is a closed surface with a central hole. The inside of the cylinder is a hollow cavity (13). The bottom end surface is an open opening communicating with the hollow cavity (13). A plurality of blades (12) are arranged on the top end surface. A plurality of N magnetic poles and S magnetic poles are evenly distributed along the circumference of the wheel sleeve (11). Two adjacent magnetic poles are opposite magnetic poles. A shaft sleeve hole (14) that is compatible with the hollow cavity (13) is arranged at a central position on the top end surface of the wheel sleeve (11). A hole wall extending upward is arranged around the shaft sleeve hole (14).

2. The water pump for a pet drinking fountain according to claim 1, characterized in that: The stator (3) is composed of a frame (31), a coil (32) wound on the frame (31), a magnetic sleeve (34) and a magnetic plate (35); the winding plane of the coil (32) is perpendicular to the axis of the frame (31); the magnetic sleeve (34) is placed in the central through hole of the frame (31); the magnetic plate (35) is divided into an upper magnetic plate and a lower magnetic plate; the upper magnetic plate and the lower magnetic plate have the same shape and are both composed of a base plate (351) and a plurality of bent plates (351). 54), the substrate (351) and the bending plate (354) are integrally structured and perpendicular to each other, the number of the bending plates (354) on the upper magnetic plate and the lower magnetic plate is the same, the upper magnetic plate and the lower magnetic plate are respectively placed above and below the coil (32), the substrates (351) of the two magnetic plates are opposite to each other up and down, a plurality of bending plates (354) are distributed along the periphery of the coil (32), and the bending plates (354) on the upper magnetic plate and the bending plates (354) on the lower magnetic plate are adjacent to and spaced apart from each other.

3. The water pump for a pet drinking fountain according to claim 2, characterized in that: The stator (3) is embedded in the hollow cavity (13), and an isolation layer plate is provided between the stator (3) and the inner wall of the hollow cavity (13) to water-tighten the rotor (1) and the stator (3). The outer edge of the isolation layer plate extends out of the hollow cavity (13) and extends in all directions along the bottom edge of the wheel sleeve (11); a center shaft (433) is provided on the top surface of the isolation layer plate in the hollow cavity (13), and the center shaft (433) is inserted upward into the shaft sleeve hole (14), and a center bearing (15) is installed in the shaft sleeve hole (14).

4. The water pump for a pet drinking fountain according to claim 3, characterized in that: A base plate is provided between the periphery of the stator (3) and the inner side wall of the isolation plate to facilitate lifting the isolation plate and the rotor (1) away from the stator (3). The outer edge of the base plate extends out of the hollow cavity (13) and extends in all directions along the top of the stator (3).

5. The water pump for a pet drinking fountain according to claim 4, characterized in that: The number of the bent plates (354) is the same as the number of magnetic poles on the wheel sleeve (11).

6. The water pump for a pet drinking fountain according to claim 2, characterized in that: The length of the bending plate (354) is smaller than the distance between the two base plates (351) of the upper magnetic plate and the lower magnetic plate, and the front end of the bending plate (354) is asymmetrical along the circumference of the coil (32).

7. A pet drinking fountain, comprising a water tank (4), a drinking tray (41) and a water pump for pumping water from the water tank (4) into the drinking tray (41), characterized in that: The water pump is a water pump for a pet drinking fountain as described in any one of claims 1 to 6.

8. The pet drinking fountain according to claim 7, characterized in that: The rotor (1) of the water pump is placed on a boss (431) protruding upward on a bottom plate (43) in the water storage tank (4), a central axis (433) is provided on the top surface of the boss (431), a shaft sleeve hole (14) which can be placed on the central axis (433) is provided on the inner top surface of the hollow cavity (13) of the wheel sleeve (11) of the rotor (1), a vertically arranged water delivery pipe is buckled on the rotor (1), the upper end opening of the water delivery pipe is connected to the water outlet (51) of the water drinking tray (41), a water cavity is provided at the bottom of the water delivery pipe, and a water inlet hole (521) is provided on the water cavity for sucking water from the water storage tank (4) into the water cavity, and a water outlet hole (522) is provided for discharging water in the water cavity into the water delivery pipe under the rotation of the impeller.

9. The pet drinking fountain according to claim 8, characterized in that: A base (6) is also provided under the water storage tank (4), and a stator housing (2) is provided on the base (6) at positions corresponding to the upper and lower positions of the boss (431). The stator housing (2) carries the stator (3) and is inserted upward into an inner hollow cavity (432) provided at the bottom of the boss (431).

10. The pet drinking fountain according to claim 7, characterized in that: The rotor (1) of the water pump is placed on a boss (431) protruding upward on a bottom plate (43) in the water storage tank (4); a central axis (433) is provided on the top surface of the boss (431); a shaft sleeve hole (14) which can be placed on the central axis (433) is provided on the inner top surface of the hollow cavity (13) of the wheel sleeve (11) of the rotor (1); a water filter cartridge (5) is provided on the rotor (1); a water outlet (51) at the upper end of the water filter cartridge (5) is connected to a nozzle (42) on a water drinking tray (41); a structure which can be buckled on the rotor (1) and can form a rotor wheel cavity (52) is provided at the bottom of the water filter cartridge (5); a water inlet hole (521) which can suck water in the water storage cavity into the rotor wheel cavity (52) and a water outlet hole (522) which can discharge water in the rotor wheel cavity (52) upward into the water filter cartridge (5) when the rotor (1) rotates are provided on the structure.

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