TWI695935B - Pump - Google Patents

Abstract

A pump having a flat housing and an impeller is provided. A pumping chamber is defined in the flat housing. In the flat housing, a pair of shaft pads are embedded and a bearing is accommodated. an abutting surface is defined on each shaft pad and the pair of abutting surfaces are disposed opposite to each other. The impeller is accommodated in the pumping chamber, the impeller has a rotating shaft, the rotating shaft ins inserted through the bearing, and an end surface is defined on each end of the rotating shaft. Each end surface abuts the abutting surface of the corresponding shaft pad. When the impeller rotates, the rotating shaft abuts against an internal surface of the bearing and the abutting surfaces of the pair of shaft pads to form a three-side-friction stable structure. Therefore, each end of the rotating shaft does not need to be suspended, so that the pump could be compact.

Description

Water pump

The invention relates to a water pump, especially a flat water pump.

In the existing flat water pump, the rotating shaft of the impeller is generally clamped and fixed in the pump body by bearings. The end of the rotating shaft is generally suspended to prevent the rotating shaft from contacting the structure of the pump body and wearing each other when rotating. Therefore, 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, thereby allowing the end of the rotating shaft to be accommodated in the water inlet, so that sufficient reserved space can be obtained around the end of the rotating shaft. However, the existing structural design makes the structure of the water inlet project out of the appearance of the pump body, so the thickness of the pump body is difficult to be compressed into a true flat shape. Therefore, the installation space suitable for the pump body is also limited.

In view of this, the present inventors have made great efforts to study the above-mentioned prior art and cooperate with the application of academic principles, and try their best to solve the above-mentioned problems, which becomes the improvement goal of the present inventors.

The invention provides a flat water pump.

The invention provides a water pump, which comprises a flat shell and an impeller. A water-drawing 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 a contact surface and the pair of contact surfaces are arranged to face each other. The impeller is accommodated in the pumping chamber, the impeller includes a rotating shaft, the rotating shaft passes through the bearing, and the two ends of the rotating shaft respectively form one end face, and each end face abuts the phase Corresponding contact surface of each shaft pad. When the impeller rotates, the rotating shaft respectively rubs against the inner surface of the bearing and the contact surfaces of the pair of shaft pads to form a three-sided friction structure.

In the water pump of the present invention, one of the end surfaces and the corresponding contact surfaces is a convex surface and the other is a flat surface or a convex surface. The convex surface is curved or flat.

In the water pump of the present invention, the flat housing includes a stacked plate and a cover plate, the pair of shaft pads are respectively embedded in the cover plate and the seat plate, the impeller is accommodated between the cover plate and the seat plate, and a water suction cavity is formed On the cover plate, a certain sub-coil group is provided on the seat plate, and the stator coil group is arranged around the rotating shaft, a rotating shaft cavity is provided on one side of the seat plate, a shaft pad is provided at the bottom of the rotating shaft cavity, and the rotating shaft bar penetrates In the rotating shaft cavity, the other side of the seat plate is provided with a ring cavity surrounding the rotating shaft cavity, and the stator coil assembly 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 and the outer side wall of the bearing are fitted with each other.

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 is inserted through the center of the circular plate, and one side of the circular plate is provided with a radial configuration A plurality of drainage grooves, the two ends of each drainage groove are an outer end and an inner end, and each outer end extends to the edge of the circular plate respectively, and a perforation is opened at each inner end of the circular plate, and each drainage groove is respectively The cover is provided with a flow guide cover, wherein the impeller includes a magnetic ring, which is arranged on the rotor and surrounds the rotating shaft.

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

In the water pump of the present invention, the contact 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 radiation-arranged linear grooves or a radiation-arranged plurality of curved grooves.

In the water pump of the present invention, each end surface of the rotating shaft is provided with a concave portion, and the concave portion includes at least one ring groove, a plurality of concave holes, a plurality of radial linear grooves or a plurality of radial curved grooves.

In the water pump of the present invention, the rotating shaft and the pair of shaft pads are made of ceramics.

In the water pump of the present invention, the flat housing includes a stacked plate and a cover plate, the pair of shaft pads are respectively embedded in the cover plate and the seat plate, the impeller is accommodated between the cover plate and the seat plate, and a water suction cavity is formed On the cover plate, the seat plate is made of metal material, and one side of the seat plate is provided with a rotating shaft cavity and a plurality of fixing units and perforations. In the sub-coil group, the outer layer of the stator coil group is covered with an insulating layer, and the insulating layer is fixed to each fixing unit and bearing and is extended and filled in the perforation to seal the perforation. The stator coil group is electrically connected to an energized wire, which is covered by the insulating layer Through the perforated joint, the stator coil group is arranged around the rotating shaft.

In the water pump of the present invention, the end surfaces of the two ends of the rotating shaft respectively abut the corresponding abutment surfaces on the respective shaft pads. When the impeller rotates, the rotating shaft contacts the inner surface of the bearing and each abutting surface of the pair of shaft pads and rubs to form a stable structure with three-sided friction. Therefore, the end of the rotating shaft does not need to be suspended, so the thickness of the water pump can be further compressed.

11~18: droplet

100: flat shell

101: Drain chamber

102: Into the waterway

103: Outlet

110: seat plate

111: shaft cavity

112: ring cavity

113: fixed unit

114: Piercing

120: Cover

200: impeller

210: rotating shaft

211/212: end face

213: recess

220: rotor

221: Round plate

230: Drainage trough

231: Outer end

232: inner end

233: Piercing

240: diversion cover

250: magnetic ring

310/320: Shaft pad

311/321: abutment surface

312: recess

330: Bearing

331: recess

400: stator coil group

401: Insulation

402: live wire

FIG. 1 is a three-dimensional exploded schematic view of the water pump of the first embodiment of the present invention.

2 is a cross-sectional view of the water pump of the first embodiment of the present invention.

3 is a perspective schematic view of the rotor of the water pump according to the first embodiment of the present invention

4 to 7 are schematic views of various aspects of the rotating shaft of the water pump according to the first embodiment of the present invention.

8 to 11 are schematic diagrams of various aspects of the concave portion on the end surface of the rotating shaft of the water pump according to the first embodiment of the present invention.

12 to 15 are schematic views of various aspects of the concave portion on the abutment surface of the shaft pad of the water pump of the first embodiment of the present invention.

16 and 17 are schematic views of the use state of the water pump of the first embodiment of the present invention.

18 is another schematic view of the rotor of the water pump according to the first embodiment of the present invention.

19 is another schematic diagram of the configuration of the water inlet and outlet of the water pump in the first embodiment of the present invention.

Fig. 20 is a cross-sectional view of a water pump according to a second embodiment of the invention.

21 is a schematic diagram of a seat plate in a water pump according to a second embodiment of the invention.

1 to 3, the first embodiment of the present invention provides a water pump, which includes a flat housing 100 and an impeller 200. A water-drawing chamber 101 is formed in the flat housing 100 and a pair of shaft pads 310/320 are embedded in the flat housing 100, each shaft pad 310/320 respectively forms a contact surface 311/321 and the pair of contact surfaces 311/321 321 opposite configuration.

The flat housing 100 includes a stacked plate 110 and a cover plate 120. The pair of shaft pads 310/320 are embedded in the cover plate 120 and the seat plate 110 respectively, and the water suction chamber 101 is formed on the cover plate 120. A certain sub-coil group 400 is provided on the seat plate 110, and a shaft cavity 111 is provided on one side of the seat plate 110, wherein a shaft pad 310/320 is disposed at the bottom of the shaft cavity 111. The other side of the seat plate 110 is provided with a ring cavity 112 surrounding the rotating shaft cavity 111, and the stator coil assembly 400 is accommodated in the ring cavity 112. A bearing 330 is embedded in the rotating shaft cavity 111. The seat plate 110 is preferably made of plastic. The bearing 330 is embedded in the rotating shaft cavity 111 by means of injection molding. The inner side wall of the rotating shaft cavity 111 and the outer side wall of the bearing 330 are mutually The fitting prevents the bearing 330 from falling off. Bearing 330 One end of is preferably slightly protruded from the seat plate 110, thereby avoiding the formation of burrs at the junction of the surface of the seat plate 110 and the bearing 330 when the seat plate 110 is formed.

The impeller 200 is accommodated in the water suction chamber 101 and thus 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 abuts the corresponding abutting surface respectively 311/321. The rotor is provided with a magnetic ring 250. 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 magnetically conductive material so that at least a part of the rotor 220 constitutes the magnetic ring 250. The stator coil group 400 is disposed around the rotating shaft 210, the stator coil group 400 and the magnetic ring 250 are interspersed with each other, and the stator coil group 400 and the magnetic ring 250 are spaced apart, and in this embodiment, between the stator coil group 400 and the magnetic ring 250 It is further separated by the seat plate 110.

One of the end surfaces 211/212 and the corresponding abutment surfaces 311/321 is convex and the other is flat. The present invention does not limit the form of the convex surface, which can be configured to meet different needs. 4 or the curved surface shown in FIG. 7, or the platform-shaped convex surface with a rounded outer edge shown in FIG. 6, or the platform-shaped convex surface with a rounded outer edge shown in FIG. 5. For example, as shown in FIGS. 4 to 6, the end surface 211/212 is convex and the contact surface 311/321 contacted by it is flat, or the contact surface 311/321 shown in FIG. 7 is convex and its contact surface 211/212 is flat. Thereby, the two end surfaces 211/212 of the rotating shaft 210 and the friction shaft pads 310/320 are in point or small area contact to reduce the friction between the two. When two objects of different materials touch and rub against each other, the harder one will wear away the softer one. In this embodiment, the rotating shaft 210 and the pair of shaft pads 310/320 may preferably be made of the same material to slow down each To extend the life of 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 for illustration. The end surface 211 of the rotating shaft 210 may be provided with a concave portion 213 to facilitate the working fluid to enter the rotating shaft 210 Between the end face 211 and the shaft pad 310 in contact to achieve the effect of lubrication, under the condition of working fluid lubrication, the rotating shaft 210 and The friction coefficient between the contacted shaft pads 310/320 can reach 0.05 or less. The concave portion 213 may specifically be a hole or a groove, but the invention does not limit the form of the concave portion 213, for example, it may be a ring groove as shown in FIG. 8, a concave hole as shown in FIG. 9, and a radiation arrangement straight line as shown in FIG. The groove or the groove of the radiation arrangement curve shown in FIG. 11.

As shown in FIGS. 12 to 15, in this embodiment, only the abutment surface 311 of one of the shaft pads 310 is used as an example for illustration. The abutment surface 311 of the shaft pad 310 may be provided with a concave portion 312 to facilitate the working fluid to enter the shaft pad 310 Lubrication is achieved between the end surfaces 211 of the rotating shaft 210 in contact with each other. The concave portion 312 may specifically be a hole or a groove, but the invention does not limit the form of the concave portion 321, for example, it may be a ring groove as shown in FIG. 12, a concave hole as shown in FIG. 13, and a radiation arrangement line as shown in FIG. 14. The groove or the groove of the radiation arrangement curve shown in FIG. 15.

In this embodiment, preferably, the rotating shaft 210, the shaft pads 310/320 and the bearing 330 are all made of ceramic materials, and the ceramic materials may be preferably silicon nitride (Si3N4) or silicon carbide (SiC) ), titanium carbide (TiC), zirconia (ZrO2), alumina (Al2O3), fiber-reinforced glass and glass ceramic matrix composite materials, etc. The ceramic bearing 330 has a long service life and a high speed limit, and is suitable for high-speed and ultra-high-speed, 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 frictional force is quite small.

Referring to FIGS. 1 to 3 and FIGS. 16 to 17, the rotor 220 is disposed around the rotating shaft 210. Specifically, the rotor 220 includes a circular plate 221, and the rotating shaft 210 is inserted through the center of the circular plate 221 and is fitted and fixed with the circular plate 221 by coating and injection molding. One side of the circular plate 221 is provided with a radial configuration In the plurality of drainage grooves 230, the two ends of each drainage groove 230 are respectively an outer end 231 and an inner end 232, and each outer end 231 extends to the edge of the circular plate 221, respectively. The circular plate 221 defines a through hole 233 at each inner end 232. The impeller 200 sinks into the working fluid (not shown) in the pumping chamber 101, and the perforation 233 is formed in the circular plate 221 to facilitate the introduction of the working fluid into each drainage groove 230 and then enter the water outlet 103 by centrifugal force and pressure.

The scale of the thickness of the flat shell 100 is much smaller than the scale of its length and width, so the flat shell 100 can be regarded as a flat plate as a whole. A water inlet 102 and a water outlet 103 are formed in the flat housing 100. The water inlet 102 and the water outlet 103 are formed on the cover plate 120, and one end of the water inlet 102 and the water outlet 103 are located at any position of the flat housing 100, respectively. One 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 water outlet 103 respectively extend to communicate with the suction chamber 101. In this embodiment, the inlet channel 102 and the outlet channel 103 respectively communicate with the same side edge of the flat housing 100 and extend linearly to the suction chamber 101, but the invention is not limited thereto. According to the different space of the water pump, the inlet channel 102 and the outlet channel 103 can also communicate with different sides of the flat housing 100 as shown in FIG. . The extension line of the end of the inlet channel 102 communicating with the suction chamber 101 is farther away from the rotating shaft 210 and is tangent to the outer edge of the suction chamber 101, and the end of the outlet channel 103 communicating with the suction chamber 101 is farther away from rotation The extension line on one side of the shaft 210 is tangent to the outer edge of the water pumping chamber 101. Thereby, the working fluid flowing into the suction chamber 101 from the water inlet channel 102 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 easily enters the water drainage groove 230 from the water inlet 102. The drainage groove 230 near the outlet channel 103 is aligned with the outlet channel 103, and the working fluid is easily discharged to the outlet channel 103 under the action of centrifugal force and pressure.

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

The droplet 11 approaches the outlet channel 103, and the impeller 200 rotates to apply force to the droplet 11 to drive the droplet 11 to the low-pressure region in the outlet channel 103. The impeller 200 rotates to force the droplet 12 to accelerate the flow of the droplet 12 The water outlet 103 drains water, and the impeller 200 rotates to urge the droplets 13 to further accelerate the droplets 13 to flow to the water outlet 103 for drainage. Both the droplet 14 and the droplet 15 are the residual working fluid after the drainage channel 230 where they are discharged to the outlet channel 103, because most of the working fluid flows out through the outlet channel 103, thereby forming a negative pressure space 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 channel 230 where the working fluid flows into the channel 102 under atmospheric pressure, and the working fluid begins to enter the drainage channel where the droplet 16 and the droplet 17 are located槽230。 Groove 230. The droplet 18 is the working fluid fully loaded in the drainage groove 230, and the impeller 200 rotates to move it to the position of the droplet 11. The impeller 200 rotates and repeats the above-mentioned cycle to work so that the working fluid is pumped from the inlet channel 102 to the outlet channel 103 under the pressure difference.

As shown in FIG. 18, each of the drainage grooves 230 may be respectively covered with a flow guiding cover 240. The flow guiding cover 240 helps to avoid the loss of kinetic energy of the working fluid passing through the drainage groove 230, so that the working fluid has higher pressure and centrifugal force. Thereby increasing the pump head.

In the water pump of the present invention, the end surfaces 211/212 of the two ends of the rotating shaft 210 respectively abut the contact surfaces 311/321 on the corresponding shaft pads 310/320. When the impeller 200 rotates, the rotating shaft 210 contacts the inner surface of the bearing 330 and the contact surfaces 311/321 of the pair of shaft pads 310/320 and rubs to form a stable structure with three-sided friction. Therefore, the end of the rotating shaft 210 does not need to be suspended, so the thickness of the water pump can be further compressed.

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 the previous embodiment, and the similarities are not repeated here.

In this embodiment, the difference between the first embodiment shown in FIG. 20 and the first embodiment shown in FIG. 2 is that the seat plate 110 is made of a metal material, and the seat plate 110 has a shaft cavity 111, a plurality of fixing units 113 and a perforation 114 on one side. , A shaft pad 320 is provided at the bottom of the rotating shaft cavity 111, and the rotating shaft 210 penetrates the rotating shaft cavity 111, the seat plate 110 is provided with a stator coil assembly 400, the outer layer of the stator coil assembly 400 is covered with an insulating layer 401 and the insulating layer 401 can Each fixing unit 113 and bearing 330 are combined and fixed to extend and fill the through hole 104 to seal the through hole 104. The stator coil assembly 400 is electrically connected to an energized wire 402. The energized wire 402 is covered by the insulating layer 400 and passes through the through hole 114 and an external power supply ( (Not shown) connected, the stator coil assembly 400 is arranged around the rotating shaft 210.

The characteristic of this embodiment is that the seat plate 110 is made of metal material, which can effectively improve the structural strength of the water pump; the outer layer of the stator coil group 400 is covered with an insulating layer 401 and the insulating layer 401 is combined with each fixing unit on the seat plate 110 , Even if the stator coil group 400 is located on the same side as the rotating shaft cavity 111, it can also be damaged due to the coating of the insulating layer 401, which can prevent the stator coil group 400 from being injected through the mold , The fixing unit 113, the bearing 330 and the conducting wire 402 are fixed together, and the insulating layer 400 is further extended and filled in the through hole 104, even if the stator coil group 400 is provided inside the water pump, it can also pass through the conducting wire 402 and the external power supply Electrically connected to obtain working power to work normally. The material of the insulating layer 401 can be plastic, AB glue, rubber or silicone, etc., which can be selected according to user needs.

The above 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.

For those of ordinary knowledge in the technical field described in the present invention, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. invention. Therefore, no matter from which point of view, the embodiments should be regarded as an example rather than a limitation. The patent scope of the present invention is defined by the patent application scope of the invention rather than the above description. All changes within the scope are included in the present invention. The scope of patents of the present invention should not be limited by any graphic marks.

In the description of the present invention, it should be understood that the terms "center", "portrait", "landscape", "upper", "lower", "front", "rear", "left", "right", " Vertical, Horizontal, Top, and Bottom ”, “inner”, “outer” and other indications are based on the orientation or positional relationship shown in the drawings, only to describe the present invention and simplify the description, rather than indicating or implying that the device or element must have The specific orientation, construction and operation in the specific orientation are therefore not intended to limit the invention. In addition, the terms "first", "second", etc. are for descriptive purposes only, and do not indicate or imply relative importance or implicitly indicate the number of technical features indicated. Thus, features limited to "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise stated, "plurality" means two or more.

In addition, it should be understood that although the description is described according to the embodiments, not every embodiment only contains an independent technical solution. This description of the description is only for clarity, and the technical field described in the present invention has general knowledge The description should be taken as a whole, and the technical solutions in the embodiments can be combined as appropriate to form other embodiments that can be understood by those with ordinary knowledge in the technical field of the present invention.

100: flat shell

101: Drain chamber

110: seat plate

111: shaft cavity

112: ring cavity

120: Cover

200: impeller

210: rotating shaft

211/212: end face

220: rotor

221: Round plate

230: Drainage trough

231: Outer end

232: inner end

233: Piercing

250: magnetic ring

310/320: Shaft pad

311/321: abutment surface

330: Bearing

400: stator coil group

Claims (10)

A water pump includes: a flat housing, a water suction cavity is formed in the flat housing, and a pair of shaft pads are embedded in the flat housing and a bearing is accommodated, each of the shaft pads forms an abutment surface and the abutment The contact surfaces are arranged oppositely; and an impeller is accommodated in the pumping cavity, the impeller includes a rotating shaft, the rotating shaft passes through the bearing, and the two ends of the rotating shaft respectively form one end surface, and each end surface is respectively Abutting the abutting surfaces of the corresponding shaft pads, wherein, when the impeller rotates, the rotating shaft respectively rubs against the inner surface of the bearing and the abutting surfaces of the pair of shaft pads to form three-sided friction Structure; wherein the impeller includes a rotor fitted with the rotating shaft, and the rotor is arranged around the rotating shaft, the rotor includes a circular plate, the rotating shaft is penetrated at the center of the circular plate, the circular plate One side is provided with a plurality of radial drainage grooves, and the two ends of each drainage groove are an outer end and an inner end, and each outer end extends to the edge of the circular plate, and the circular plate is at each inner end A perforation is opened respectively, and each of the drainage grooves is respectively covered with a flow guiding cover, wherein the impeller includes a magnetic ring, the magnetic ring is disposed on the rotor and surrounds the rotating shaft. . The water pump according to claim 1, wherein one of each of the end surfaces and the corresponding contact surface is a convex surface and the other is a flat surface or a convex surface. The water pump according to claim 2, wherein the convex surface is curved or flat. The water pump according to claim 1, wherein the flat housing includes a stacked 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 in the cover plate and Between the seat plates, the water suction cavity is formed on the cover plate, and the seat plate is provided with There is a stator coil group, and the stator coil group is arranged around the rotating shaft, a rotating shaft cavity is provided on one side of the seat plate, a shaft pad is arranged at the bottom of the rotating shaft cavity, and the rotating shaft penetrates the rotating shaft Cavity, the other surface of the seat plate is provided with a ring cavity surrounding the rotating shaft cavity, and the stator coil assembly is accommodated in the ring cavity. The water pump according to claim 4, wherein the bearing is embedded in the rotating shaft cavity, and the inner side wall of the rotating shaft cavity and the outer side wall of the bearing are fitted with each other. The water pump according to claim 1, wherein an inlet channel and an outlet channel are formed in the flat housing, and the inlet channel and the outlet channel extend from any side edge of the flat housing parallel to the flat housing to communicate The water suction chamber, an extension line on the end of the water inlet communicating with the water suction chamber on a side farther from the rotating shaft is tangent to the outer edge of the water suction chamber, and the water outlet communicates with an end of the water suction chamber The extension line on the side farther away from the rotating shaft is tangent to the outer edge of the water suction chamber. The water pump according to claim 1, wherein the abutment surface is provided with a concave portion, the concave portion including at least one ring groove, a plurality of concave holes, a plurality of radial linear grooves or a plurality of radial curved grooves. The water pump according to claim 1, wherein each end surface of the rotating shaft is provided with a concave portion, the concave portion including at least one ring groove, a plurality of concave holes, a plurality of radial linear grooves or a plurality of radial curved grooves. The water pump according to claim 1, wherein the rotating shaft and the pair of shaft pads are made of ceramic. The water pump according to claim 1, wherein the flat housing includes a stacked 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 in the cover plate and Between the seat plates, the water-drawing cavity is formed on the cover plate, the seat plate is made of metal material, and a rotating shaft cavity and a plurality of fixing units and perforations are provided on one side of the seat plate The shaft pad is arranged at the bottom of the rotating shaft cavity, and the rotating shaft penetrates into the rotating shaft cavity, the seat plate 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 and each The fixing unit and the bearing are fixed together and extended to fill the perforation to seal the perforation. The stator coil assembly is electrically connected to an energized wire. The energized conductor is covered by the insulating layer and passes through the perforation. The stator coil assembly surrounds the perforation Rotating shaft configuration.

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