WO2020155267A1

WO2020155267A1 - Water pump

Info

Publication number: WO2020155267A1
Application number: PCT/CN2019/076228
Authority: WO
Inventors: 肖启能
Original assignee: 深圳市研派科技有限公司
Priority date: 2019-01-30
Filing date: 2019-02-27
Publication date: 2020-08-06
Also published as: CN109707633B; CN109707633A

Abstract

A water pump, comprising a flat housing (100) and an impeller (200). A water drawing cavity (101) is formed in the flat housing (100), a pair of shaft pads (310/320) is embedded in the flat housing (100), and a bearing (330) is accommodated therein; and the shaft pads (310/320) are formed with an abutting surface (311/321) respectively, and the pair of abutting surfaces (311/321) are oppositely arranged. The impeller (200) is accommodated in the water drawing cavity (101); the impeller (200) comprises a rotary shaft rod (210); the rotary shaft rod (210) penetrates the bearing (330); and the two ends of the rotary shaft rod (210) are formed with an end surface (211/212) respectively, and each end surface (211/212) abuts against the abutting surface (311/321) of each corresponding shaft pad (310/320) respectively. During the rotation of the impeller (200), the rotary shaft rod (210) makes contact with the inner side surface of the bearing (330) and the abutting surfaces (311/321) of the pair of shaft pads (310/320) respectively, and the friction forms a stable structure having three-surface friction. Thus, the end part of the rotary shaft rod (210) does not need to be arranged in suspension, thereby being able to further compress the thickness of the water pump.

Description

i A water pump Technical field

[0001] The present invention relates to a water pump, especially a flat water pump.

Background technique

[0002] 5 See some flat water pumps, the rotating shaft of the impeller is generally clamped and fixed in the pump body by a bearing, and the end of the rotating shaft is generally suspended to avoid contact between the rotating shaft and the structure of the pump body. Mutual wear when rotating, so a certain gap must be reserved between the pump body and the rotating shaft. A common configuration method is to set the water inlet corresponding to the center of the impeller, so that the end of the rotating shaft can be accommodated in the water inlet, so that sufficient reserved space can be obtained around the end of the rotating shaft.

Summary of the invention

technical problem

[0003] However, the existing structural design makes the structure of the water inlet necessarily protrude from the outer surface of the pump body, so the thickness of the pump body is difficult to compress to a true flat shape. Therefore, the applicable installation space of the pump body is limited.

[0004] In view of this, the present inventors focused on the above-mentioned prior art, especially concentrated research and the application of scientific theory, and tried their best to solve the above-mentioned problems, which became the goal of the present inventor's improvement.

[0005] Technical Solution The present invention provides a flat water pump.

[0006] The present invention provides a water pump, which includes a flat shell and an impeller. A pumping cavity is formed in the flat shell, and a pair of shaft pads are embedded in the flat shell and a bearing is accommodated. Each shaft pad forms an abutting surface and the pair of abutting surfaces are arranged oppositely. The impeller is accommodated in the water pumping cavity. The impeller includes a rotating shaft passing through the bearing. Two ends of the rotating shaft respectively form one end surface, and each end surface abuts against the contact surface of the corresponding shaft pad. When the impeller rotates, the rotating shaft respectively rubs against the inner surface of the bearing and each abutting surface of the pair of shaft pads to form a three-sided friction structure.

[0007] In the water pump of the present invention, among each end surface and the corresponding contact surface, one of them is convex and the other is flat or convex. The convex surface is curved or platform-shaped.

[0008] In the water pump of the present invention, the flat housing includes a stacked seat plate and a cover plate, the pair of shaft pads are respectively embedded in the cover plate and the seat plate, and the impeller is accommodated between the cover plate and the seat plate. The water cavity is formed on the cover plate, the seat plate A certain sub-coil group is provided on the upper part, and the stator coil group is arranged around the rotating shaft. One side of the seat plate is provided with a shaft cavity, a shaft pad is arranged at the bottom of the shaft cavity, and the rotating shaft rod penetrates into the shaft cavity. On the other side there is a ring cavity surrounding the rotating shaft cavity, and the stator coil group is accommodated in the ring cavity. The bearing is embedded in the rotating shaft cavity, and the inner side wall of the rotating shaft cavity is fitted with the outer side wall of the bearing.

[0009] In the water pump of the present invention, the impeller includes a rotor fitted with a rotating shaft, and the rotor is arranged around the rotating shaft, the rotor includes a circular plate, the rotating shaft passes through the center of the circular plate, and one side of the circular plate is provided There are a plurality of drainage grooves arranged radially. The two ends of each drainage groove are respectively an outer end and an inner end, and each outer end extends to the edge of the circular plate. The circular plate is provided with a perforation at each inner end. The drainage grooves are respectively covered with a guide cover, wherein the impeller includes a magnetic ring which is arranged on the rotor and surrounds the rotating shaft rod.

[0010] In the water pump of the present invention, an inlet and an outlet are formed in the flat housing, and the inlet and the outlet respectively extend from any side edge of the flat housing and extend parallel to the flat housing to the connecting suction cavity, and the inlet The extension line on the side farther away from the rotating shaft on the end connected to the pumping cavity is tangent to the outer edge of the pumping cavity, and the extension line on the side farther away from the rotating shaft on the end of the outlet connected to the pumping cavity and The outer edge of the water draw cavity is tangent.

[0011] In the water pump of the present invention, the abutting surface is provided with a concave portion, and the concave portion includes at least one ring groove, a plurality of concave holes, a plurality of radially arranged linear grooves or a radially arranged plural curved grooves.

[0012] In the water pump of the present invention, each end surface of the rotating shaft is provided with a recess, and the recess includes at least one ring groove, a plurality of recesses, a plurality of radially arranged linear grooves or a radiantly arranged complex curved groove.

[0013] In the water pump of the present invention, the rotating shaft and the pair of shaft pads are both made of ceramic.

[0014] In the water pump of the present invention, the flat housing includes a stack of a seat plate and a cover plate, the pair of shaft pads are respectively embedded in the cover plate and the seat plate, and the impeller is accommodated between the cover plate and the seat plate. The water cavity is formed on the cover plate. The seat plate is made of metal. One side of the seat plate is provided with a rotating shaft cavity, a plurality of fixing units and perforations. One of the shaft pads is arranged at the bottom of the rotating shaft cavity, and the rotating shaft rod penetrates into the rotating shaft cavity. The board is provided with a certain sub-coil group, the outer layer of the stator coil group is covered with an insulating layer, and the insulating layer is combined with each fixed unit and the bearing to be fixed and extended to fill the perforation to seal the perforation. The stator coil group is electrically connected to an energized wire, The insulating layer is covered and passed through the perforation, and the stator coil group is arranged around the rotating shaft.

[0015] In the water pump of the present invention, the end surfaces of the two ends of the rotating shaft respectively abut against the contact surfaces on the corresponding shaft pads. When the impeller rotates, the rotating shaft respectively contacts and rubs with the inner side surface of the bearing and each abutting surface of the pair of shaft pads to form a three-sided friction stable structure. Therefore, the end of the rotating shaft does not need to be suspended, so it can Further compress the thickness of the water pump.

The solution to the problem

The beneficial effects of the invention

Brief description of the drawings

Description of the drawings

[0016] FIG. 1 is a three-dimensional exploded schematic view of the water pump according to the first embodiment of the present invention;

[0017] FIG. 2 is a cross-sectional view of the water pump according to the first embodiment of the present invention;

[0018] FIG. 3 is a perspective view of the rotor of the water pump according to the first embodiment of the present invention;

[0019] FIGS. 4 to 7 are schematic diagrams of various aspects of the rotating shaft of the water pump according to the first embodiment of the present invention;

[0020] FIGS. 8 to 11 are schematic views of various aspects of the recesses on the end surface of the rotating shaft of the water pump according to the first embodiment of the present invention;

[0021] FIGS. 12 to 15 are schematic diagrams of various aspects of the recesses on the abutting surface of the shaft pad of the water pump according to the first embodiment of the present invention;

[0022] FIGS. 16 and 17 are schematic diagrams of the use state of the water pump according to the first embodiment of the present invention;

[0023] FIG. 18 is a schematic view of another aspect of the rotor of the water pump according to the first embodiment of the present invention;

[0024] FIG. 19 is another configuration diagram of the inlet and outlet of the water pump according to the first embodiment of the present invention;

[0025] FIG. 20 is a cross-sectional view of a water pump according to a second embodiment of the present invention;

[0026] FIG. 21 is a schematic diagram of a water pump seat plate of a second embodiment of the present invention;

[0027] Explanation of each symbol in the figure:

[0028] droplet, 100-flat shell, 101-water draw cavity, 102-inlet, 103-outlet,

[0029] 110-seat plate, 111-shaft cavity, 112-ring cavity, 113-fixed unit, 114

-Perforated, 120-cover, 200-impeller, 210 -rotating shaft, 211/212 -end face, 213 -recess, 220 -rotor, 221-circular plate, 230 -drainage groove, 231-outer end, 232 -inner End, 233-perforation, 240-guide cover, 250-magnetic ring, 310/320-shaft pad, 311/321-abutment surface, 312-recess, 330-bearing, 331-recess, 400-stator coil assembly, 401-insulation layer, 402-energized wire.

Invention embodiment

Embodiments of the invention [0030] Referring to FIGS. 1 to 3, a first embodiment of the present invention provides a water pump, which includes a flat housing 100 and an impeller 200. A pumping cavity 101 is formed in the flat housing 100 and a pair of shaft pads 310/320 are embedded in the flat housing 100. Each of the shaft pads 310/320 respectively forms an abutting surface 311/321 and the pair of abutting surfaces 311/ 321 facing configuration.

[0031] The flat housing 100 includes a stack of a base plate 110 and a cover plate 120, the pair of shaft pads 310/320 are embedded in the cover plate 120 and the base plate 110, respectively, and the drain cavity 101 is formed on the cover plate 120. The seat plate 110 is provided with a certain sub-coil group 400, and one side of the seat plate 110 is provided with a rotating shaft cavity 111, and a shaft pad 310/320 is arranged at the bottom of the rotating shaft cavity 111. An annular cavity 112 surrounding the rotating shaft cavity 111 is provided on the other surface of the seat plate 110, and the stator coil assembly 400 is accommodated in the annular cavity 112. A bearing 330 is embedded in the shaft cavity 111. The seat plate 110 is preferably made of plastic. The bearing 330 is embedded in the shaft cavity 111 by coating and injection molding. The inner side wall of the shaft cavity 111 and the outer side wall of the bearing ₃₃₀ are mutually Fitting prevents the bearing _{330 from} falling off. One end of the bearing 330 preferably slightly protrudes from the seat plate 110, so as to avoid the formation of burrs on the surface of the seat plate 110 and the bearing 330 when the seat plate 110 is formed.

[0032] The impeller 200 is accommodated in the pumping cavity 101 and is therefore accommodated between the cover plate 120 and the seat plate 110. The impeller 200 includes a rotating shaft 210 and a rotor 220. The two ends of the rotating shaft 210 respectively form one end surface 211/212, the rotating shaft 210 penetrates into the rotating shaft cavity 111 and the rotating shaft 210 passes through the bearing 330, and each end surface 211/212 respectively abuts the corresponding abutting surfaces 311/321. A magnetic ring 250 is provided on the rotor. The magnetic ring 250 may be a ring-shaped magnetic material embedded on the rotor 220, or the rotor 220 itself may be made of a magnetic conductive material so that at least a part of the rotor 220 constitutes the magnetic ring 250. The stator coil group 400 is arranged around the rotating shaft 210, the stator coil group 400 and the magnetic ring 250 are inserted into each other, and the stator coil group 400 and the magnetic ring 250 are arranged at intervals. In this embodiment, between the stator coil group 400 and the magnetic ring 250 It is further separated by the seat plate 110.

[0033] One of the end surfaces 211/212 and the corresponding abutment surfaces 311/321 is a convex surface and the other is a flat surface. The present invention does not limit the form of the convex surface, and it can be configured with different forms of convex surface according to requirements. It can be the curved surface shown in FIG. 4 or FIG. 7, or the platform-shaped convex surface with rounded outer edges shown in FIG. 6, or the platform-shaped convex surface with chamfered outer edges shown in FIG. For example, as shown in FIGS. 4 to 6, the end surface 211/212 is a convex surface and the contact surface 311/321 is a flat surface, or the contact surface 311/321 shown in FIG. 7 is a convex surface and the contact end surface 211/212 is flat. In this way, the two end surfaces 211/212 of the rotating shaft 210 and the friction pad 310/320 are in point or small area contact to reduce the friction between the two. When two objects of dissimilar materials touch and rub each other The harder ones will wear out the softer ones. In this embodiment, the rotating shaft 210 and the pair of shaft pads 310/320 can preferably be made of the same material to reduce the wear of each and prolong the life of the parts. As shown in FIGS. 8 to 11, in this embodiment, only one end surface 211 of the rotating shaft 210 is taken as an example. The end surface 211 of the rotating shaft 210 may be provided with a recess 213 to facilitate the working fluid to enter the rotating shaft 210. The end surface 211 and the contacting shaft pad 310 are lubricated. Under the condition of working fluid lubrication, the friction coefficient between the rotating shaft 210 and the contacting shaft pad 310/320 can reach 0.05 or less. Specifically, the recess 213 may be a hole or a groove, but the present invention does not limit the form of the recess 213. For example, it may be a ring groove shown in FIG. 8, a recessed hole shown in FIG. 9, or a radial arrangement line shown in FIG. The groove or the radially arranged curved groove shown in FIG. 11.

[0034] As shown in FIGS. 12 to 15, in this embodiment, only the abutting surface 311 of one of the shaft pads 310 is taken as an example, and the abutting surface 311 of the shaft pad 310 may be provided with a recess 312 to facilitate the working fluid It enters between the shaft pad 310 and the end surface 211 of the rotating shaft 210 that is in contact to achieve lubrication. Specifically, the recess 312 may be a hole or a groove, but the present invention is not limited to the form of the recess 321, which may be, for example, as shown in FIG ring groove 12, as shown in FIG recesses 13, ₁₄ radially arranged in a straight line as shown in FIG. The groove or the radially arranged curved groove shown in FIG. 15.

[0035] In this embodiment, preferably, the rotating shaft 210, the shaft pad 310/320, and the bearing 330 are all made of ceramic materials, and the ceramic materials may preferably be Si3N4, carbonized Silicon (SiC), Titanium Carbide (TiC)

, Zirconia (Zr02), Alumina (A1203) and fiber reinforced glass and glass ceramic matrix composite materials. The ceramic bearing 330 has a long service life and a high upper speed limit, which is suitable for high-speed, ultra-high-speed and high-precision equipment. In addition, ceramic materials are resistant to high temperature, corrosion, and insulation, and their applicable fields are quite wide. Furthermore, the surface roughness of the ceramic rotating shaft 210, the shaft pad 310/320, and the bearing 330 can reach 0.005 microns, so the friction force is quite small.

[0036] Referring to FIGS. 1 to 3 and FIGS. 16 to 17, the rotor 220 is arranged around the rotating shaft 210. Specifically, the rotor 220 includes a circular plate 221. The rotating shaft 210 penetrates the center of the circular plate 221 and is fitted and fixed with the circular plate 221 by coating and injection molding. The circular plate 221 is provided with a radial shape on one side. A plurality of drainage grooves 230 are configured, and two ends of each drainage groove 230 are an outer end 231 and an inner end 232, and each outer end 231 extends to the edge of the circular plate 221, respectively. Each inner end 232 of the circular plate 221 is provided with a perforation 233 respectively. The impeller 200 sinks into the working fluid (not shown in the figure) in the pumping cavity 101. The circular plate 221 is provided with perforations 233 to facilitate the working fluid to be introduced into the drainage grooves 230 and then into the outlet 103 by centrifugal force and pressure.

[0037] The thickness scale of the flat housing 100 is much smaller than the length and width scale, so the flat housing 10 can be integrated 0 is considered flat. An inlet 102 and an outlet 103 are formed in the flat housing 100. The inlet 102 and the outlet 103 are respectively formed on the cover 120, and one end of the inlet 102 and one end of the outlet 103 are respectively located at any of the flat housing 100. Side edge. The water inlet 102 and the water outlet 103 respectively extend parallel to the flat housing 100, and the other end of the water inlet 102 and the other end of the water outlet 103 respectively extend to the water suction cavity 101. In this embodiment, the water inlet 102 and the water outlet 103 respectively communicate with the same side edge of the flat housing 100 and respectively extend linearly to communicate with the water suction cavity 101, but the present invention is not limited to this. Depending on the water pump configuration space, the water inlet 102 and the outlet 103 may also be connected to the different two sides of the flat housing 100 as shown in FIG. 19, and may be selectively extended straight or bent to communicate with the water pumping cavity 101. . The extension line on the side of the inlet channel 102 that is connected to the water pumping cavity 101 farther away from the rotating shaft 210 is tangent to the outer edge of the water pumping cavity 101, and the outlet channel 103 is connected to the water pumping cavity 101 and is farther away from the rotation The extension line on one side of the shaft 210 is tangent to the outer edge of the water pumping cavity 101. In this way, the working fluid flowing from the inlet channel 102 into the water suction chamber 101 can be completely sucked by the rotor 220 to achieve the best pumping efficiency. The drainage groove 230 near the water inlet 102 is aligned with the water inlet 102, and the working fluid can easily enter the drainage groove 230 from the water inlet 102. The drainage groove 230 near the water outlet 103 is aligned with the water outlet 103, and the working fluid is easily discharged to the water outlet 103 under the action of centrifugal force and pressure.

[0038] When the impeller 200 rotates, a pressure difference is established in the suction cavity 101 between the inlet 102 and the outlet 103, so that the pressure of the working fluid flowing into the inlet 102 is greater than the pressure of the working fluid in the outlet 103, thereby driving The working fluid in the inlet channel 102 flows to the outlet channel 103 through the suction chamber 101, and the flowing working fluid forms a plurality of droplets flowing in the water pump of the present invention 11-18=

[0039] The droplet 11 is close to the outlet channel 103, and the impeller 200 rotates to force the droplet 11 to drive the droplet 11 to the low pressure area in the outlet channel 103. The impeller 200 rotates to force the droplet 12 to accelerate the flow of the droplet 12 to the outlet channel 103 to discharge, and the impeller 200 rotates to force the droplet 13 to further accelerate the flow of the droplet 13 to the outlet channel 103 to discharge. Both the droplet 14 and the droplet 15 are the residual working fluid after the drainage tank 230 where they are drained to the outlet channel 103. Since most of the working fluid flows out through the outlet channel 103, a negative pressure space is formed in the drainage channel 230 where they are located. Both the droplet 16 and the droplet 17 are close to the inlet channel 102. Because there is a negative pressure space in the drainage groove 230 where they are located, the working fluid that flows into the channel 102 under atmospheric pressure begins to enter the drainage where the droplets 16 and 17 are located.槽230. The droplet 18 is the working fluid full of the drainage tank 230, and the impeller 200 rotates to drive it to the position of the droplet 11. The impeller 200 rotates to repeat the above cycle to perform work to pump the working fluid from the inlet 102 to the outlet 103 under the pressure difference. [0040] Each drainage groove 230 may also be covered with a diversion cover 240 as shown in FIG. 18. The diversion cover 240 helps prevent the working fluid passing through the drainage groove 230 from losing kinetic energy, so that the working fluid has a higher pressure. And centrifugal force, thereby increasing the pump head.

[0041] In the water pump of the present invention, the end surfaces 211/212 of the two ends of the rotating shaft 210 respectively abut against the corresponding shaft pads

The abutment surface 311/321 on 310/320. When the impeller 200 rotates, the rotating shaft 210 respectively contacts and rubs the inner side surface of the bearing 330 and the contact surfaces 311/321 of the pair of shaft pads 310/320 to form a three-sided frictional stable structure. Therefore, the end of the rotating shaft 210 does not need to be suspended, so the thickness of the water pump can be further reduced.

[0042] Please refer to the second embodiment of the present invention shown in FIG. 20 and FIG. 21. The characteristics of the water pump of this embodiment are roughly similar to those of the previous embodiment, and the similarities are not described here.

[0043] In this embodiment, FIG. 20 is different from the first embodiment shown in FIG. 2 in that the seat plate 110 is made of a metal material, and the seat plate 110 has a shaft cavity 111 and a plurality of fixing units on its surface. 113 and perforation 114, a shaft pad 320 is arranged at the bottom of the shaft cavity 111, and the rotating shaft 210 penetrates into the shaft cavity 111, the seat plate 110 is provided with a stator coil assembly 400, and the outer layer of the stator coil assembly 400 is covered with an insulating layer 401 In addition, the insulating layer 401 can be combined with each fixing unit 113 and the bearing 330 to be fixed and extended to fill the through hole 104 to seal the through hole 104. The stator coil assembly 400 is electrically connected to an energized wire 402, and the energized wire 402 is covered by the insulating layer 400 and passes through The through hole 114 is connected to an external power source (not shown), and the stator coil assembly 400 is arranged around the rotating shaft 210.

[0044] The feature of this embodiment is that the base plate 110 is made of a metal material to effectively improve the structural strength of the water pump; the outer layer of the stator coil assembly 400 is covered with the insulating layer 401 and the insulating layer 401 is connected to the base plate 110 After the fixing units are combined, even if the stator coil assembly 400 is located on the same surface as the shaft cavity 111, it can also avoid damage due to contact with liquid due to the coating of the insulating layer 401. The insulating layer 401 can be injected through the mold. The stator coil group 400, the fixing units 113, the bearing 330, and the energized wire 402 are combined together with the fixing method, and the insulating layer 400 is further extended and filled in the perforation 104. Even if the stator coil group 400 is arranged inside the water pump, it can By electrically connecting the energized wire 402 to an external power source, working power can be obtained for normal operation. The material of the insulating layer 401 can be plastic, AB glue, rubber or silicone, etc., which can be selected according to the needs of users.

[0045] The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Other equivalent changes using the patent spirit of the present invention should all fall within the patent scope of the present invention.

[0046] For those skilled in the art, it is obvious that the present invention is not limited to the details of the foregoing exemplary embodiments, and The present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the foregoing description, and therefore it is intended to fall into the claims. All changes within the meaning and scope of equivalent elements of are included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right" "," "vertical", "horizontal", "top", "bottom", "inner", "outer" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for ease of description The present invention creates and simplifies the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "second" and so on are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, the terms "first" and "second" The features such as “two” may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, “multiple” means two or more.

[0048] In addition, it should be understood that although this specification is described in accordance with the implementation manners, not each implementation manner includes only an independent technical solution. This narration in the specification is only for clarity, and those skilled in the art should refer to the specification As a whole, the technical solutions in the embodiments can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0049]

Claims

[Claim 1] 1. A water pump, comprising:

A flat housing formed with a suction cavity and a pair of shaft pads embedded in the flat housing and containing a bearing, each of the shaft pads respectively forming an abutting surface and the pair of abutting surfaces are arranged oppositely ; as well as

An impeller is housed in the water pumping cavity, the impeller includes a rotating shaft, the rotating shaft passes through the bearing, two ends of the rotating shaft respectively form one end surface, and each end surface abuts against the corresponding one The abutting surface of the shaft pad,

Wherein, when the impeller rotates, the rotating shaft respectively rubs against the inner side surface of the bearing and each abutting surface of the pair of shaft pads to form a three-sided friction structure.

[Claim 2] 2. The water pump according to claim 1, characterized in that: in each of the end surface and the corresponding contact surface, one of them is convex and the other is flat or convex.

[Claim 3] 3. The water pump according to claim 2, wherein the convex surface is arcuate or flat.

[Claim 4] 4. The water pump according to claim 1, wherein the flat housing includes a base plate and a cover plate in a stacked configuration, and the pair of shaft pads are respectively embedded in the cover plate and the base Plate, the impeller is accommodated between the cover plate and the seat plate, the pumping cavity is formed on the cover plate, the seat plate is provided with a certain sub-coil group, and the stator coil group is arranged around the rotating shaft One side of the seat plate is provided with a rotating shaft cavity, the shaft pad is arranged at the bottom of the rotating shaft cavity, and the rotating shaft rod penetrates into the rotating shaft cavity, and the other side of the seat plate is provided with a shaft surrounding the rotating shaft cavity. A ring cavity, and the stator coil group is accommodated in the ring cavity.

[Claim 5] 5. The water pump of claim 4, wherein the bearing is embedded in the shaft cavity, and the inner wall of the shaft cavity and the outer wall of the bearing are fitted with each other.

[Claim 6] 6. The water pump of claim 1, wherein the impeller includes a rotor fitted with the rotating shaft, and the rotor is arranged around the rotating shaft, and the rotor includes a circular plate The rotating shaft rod penetrates the center of the circular plate, one surface of the circular plate is provided with a plurality of drainage grooves arranged radially, and the two ends of each drainage groove are an outer end and an inner end, and each of the outer ends Respectively extend to the edge of the circular plate, and each inner end of the circular plate is provided with a through hole Each of the drainage grooves is respectively covered with a guide cover, wherein the impeller includes a magnetic ring which is arranged on the rotor and surrounds the rotating shaft rod.

[Claim 7] 7. The water pump according to claim 1, wherein an inlet and an outlet are formed in the flat shell, and the inlet and the outlet are parallel to each side edge of the flat shell. The flat shell extends to communicate with the water pumping cavity, the extension line of the side farther from the rotating shaft on one end of the water inlet communicating with the water pumping cavity is tangent to the outer edge of the water pumping cavity, and the water outlet channel An extension line on one end connected to the water pumping cavity that is farther from the rotating shaft is tangent to the outer edge of the water pumping cavity.

[Claim 8] 8. The water pump of claim 1, wherein: the abutting surface is provided with a recess, the recess including at least one ring groove, a plurality of recesses, a plurality of radially arranged linear grooves or a radiating arrangement Of complex curve grooves.

[Claim 9] The water pump according to claim 1, wherein: each of the end faces of the rotating shaft is provided with a recess, the recess including at least one ring groove, a plurality of recessed holes, and a plurality of straight lines arranged in radiation Grooves or complex curved grooves arranged radially.

[Claim 10] 10. The water pump of claim 1, wherein the rotating shaft and the pair of shaft pads are both made of ceramic.

[Claim 11] 11. The water pump according to claim 1, wherein the flat housing includes a base plate and a cover plate in a stacked configuration, and the pair of shaft pads are respectively embedded in the cover plate and the base Plate, the impeller is accommodated between the cover plate and the seat plate, the suction cavity is formed on the cover plate, the seat plate is made of metal, and one side of the seat plate is provided with a shaft cavity, a plurality of fixing units and perforations One of the shaft pads is arranged at the bottom of the shaft cavity, and the rotating shaft rod penetrates into the shaft cavity, the seat plate is provided with a certain sub-coil group, the stator coil group is coated with an insulating layer and the insulating layer In combination with each of the fixing units and the bearing, it is fixed and extended to fill the perforation to seal the perforation. The stator coil assembly is electrically connected to an energized wire, the energized wire is covered by the insulating layer and passes through the perforation. The group is arranged around the rotating shaft.