Novel brushless electronic water pump

Abstract

The novel brushless electronic water pump comprises a shell, a stator assembly and a rotor impeller assembly, an impeller of the rotor impeller assembly comprises a first impeller plate, a second impeller plate and blades, a center water inlet pipe opening is formed in the center of the first impeller plate, the blades divide a fluid driving cavity into a plurality of circulation channels, and a water inlet pipe opening is formed in the center of the second impeller plate. A water outlet window is formed in the outer contour between the first impeller plate and the second impeller plate, the second impeller plate is provided with a rotor shaft sleeve, a rotor magnetic ring assembly is arranged on the rotor shaft sleeve, the blades comprise a plurality of long blades and short blades, every two long blades and one short blade or each long blade and one short blade form a blade set, and the blades are arranged in the blade set. The blade sets are evenly distributed around the center circumference of the center water inlet pipe opening, the short blades are located between the two long blades in the same set, and the short blades spirally extend to the outer contour of the water pump impeller from the middles of the long blades. The rotor impeller assembly of the brushless electronic water pump can further improve the efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of electronic water pumps, and in particular to a novel brushless electronic water pump. Background Art

[0002] The electronic water pump uses the magnetic effect between the rotor and the stator to drive the impeller to rotate, and can be used on vehicles. The current electronic water pump mainly includes a rotor impeller assembly, a stator assembly and a housing. The applicant applied for an invention patent for a rotor assembly and its mounting structure of a high-power brushless electronic water pump on November 2, 2020. The authorization announcement number is CN213870317U. The patent text records a rotor assembly including an impeller and a rotor sleeve. The impeller is fixed to the upper end of the rotor sleeve. The inner holes at the upper and lower ends of the rotor sleeve are concentrically embedded with an upper wear-resistant lubricating insert and a lower wear-resistant lubricating insert, respectively. The upper wear-resistant lubricating insert and the lower wear-resistant lubricating insert are provided with a center hole concentrically arranged with the inner hole of the rotor sleeve. The outer periphery of the rotor sleeve is fixed with a rotor core, and the outer periphery of the rotor core is evenly distributed with a number of sintered NdFeB magnets. The outer periphery of the rotor sleeve is fixed with a rotor outer shell sleeve that wraps and fixes the rotor core and sintered NdFeB magnets.

[0003] The applicant previously applied for a stator assembly of a brushless electronic water pump with patent number 202221087721.7. The stator assembly includes a plastic outer shell and a stator assembly fixed in the outer shell. The stator assembly includes a stator core, a stator winding and a plastic stator inner shell. A grounding spring is squeezed between the stator core and the outer shell and in contact with the heat dissipation metal plate, thereby achieving grounding and heat conduction at the same time.

[0004] However, the above-mentioned electronic water pump has the following disadvantages: 1. The impeller includes a lower impeller half and an upper impeller half, and the connection between the lower impeller half and the upper impeller half is plug-in matching, wherein blades are provided on the upper impeller half, and grooves matching the shape of the blades are provided on the lower impeller half. The entire blade length is the same and evenly distributed around the circumference, and due to the size limitation of the rotor assembly, it is difficult to improve the efficiency of the current impeller; 2. When the rotor assembly is in use, there will be a gap between the impeller and the upper cover to facilitate the rotation of the rotor, and this gap is easy to cause part of the liquid that originally flowed out of the impeller outlet to flow back to the central water inlet from the gap, resulting in relatively low efficiency of the impeller; 3. The dynamic balance of the current rotor assembly is difficult to adjust, and the dynamic balance directly affects the vibration and noise of the rotor assembly during movement, and also affects the efficiency of the entire electronic water pump; 3. The stator of the water pump is generally The assembled PCBA board is connected to the capacitor. The current capacitors are all set backward (downward), and the heat generated by the capacitor is mainly passively dissipated through the lower cover. However, as the power of the water pump increases, this passive heat dissipation cannot meet the requirements of passive heat dissipation; 4. The current water pump stator assembly is generally clamped from the outside of the stator core during injection molding, resulting in the outside of the water pump housing being provided with outwardly protruding convex strips, which are formed by the stator core clamping fixture. In this way, the external dimensions of the overall water pump stator assembly are relatively large, and the convex strips will also affect the subsequent fixation of the water pump. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a novel brushless electronic water pump, the rotor impeller assembly of the brushless electronic water pump can further improve the efficiency.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a new type of brushless electronic water pump, comprising a shell, an upper cover is arranged at the upper end of the shell, a lower cover is arranged at the lower end of the shell, a stator assembly is installed in the shell, a sealing sleeve is arranged in the shell, a rotor assembly installation cavity is arranged in the sealing sleeve, a rotor impeller assembly is rotatably installed in the rotor assembly installation cavity, the area between the sealing sleeve and the upper cover constitutes a fluid chamber, the impeller of the rotor impeller assembly is located in the fluid chamber, and a water inlet and a water outlet are arranged on the upper cover, characterized in that: the impeller comprises a first impeller plate, a second impeller plate and a blade connected between the first impeller plate and the second impeller plate, a fluid drive chamber is formed between the first impeller plate and the second impeller plate, a central water inlet pipe opening communicating with the fluid drive chamber is arranged at the center of the first impeller plate, the central water inlet pipe opening corresponds to the water inlet on the upper cover, the blades divide the fluid drive chamber into a plurality of flow channels, the first impeller plate and the second impeller plate The outer contour between the plates is provided with a water outlet window connected to each flow channel, the second impeller plate is provided with a rotor sleeve, and the rotor sleeve is provided with a rotor magnetic ring assembly matched with the stator assembly, characterized in that: the blades include a plurality of long blades and short blades, and each two long blades and one short blade or each long blade and one short blade form a blade group, and each blade group is evenly distributed around the central circumference of the central water inlet pipe opening; when the blade group includes two long blades and one short blade, the two long blades in each blade group are arranged at intervals, and the long blades in each blade group extend spirally from the central water inlet pipe opening to the outer contour of the water pump impeller, and the short blades in each blade group are between the two long blades in the same group; when the blade group includes one long blade and one short blade, all long blades and short blades are alternately and evenly distributed around the circumference at equal intervals; the short blades extend spirally from the middle of the long blades to the outer contour of the water pump impeller, and the outer peripheral ends between adjacent long blades, the outer peripheral ends between the long blades and the short blades, and between the first impeller plate and the second impeller plate form the water outlet window.

[0007] As a preferred solution, the long blade is a twisted blade, an inner side of the long blade is provided with an inner side inclined surface, the inner side inclined surface and the twisted upper surface of the long blade intersect to form a highest point, the highest point extends to the inner wall of the central water inlet pipe opening, the long blade and the short blade are both provided on the upper plate surface of the second impeller plate and are integrally formed with the second impeller plate, and the long blade and the short blade are welded and fixed to the lower plate surface of the first impeller plate;

[0008] Alternatively, the long blades are all arranged on the second impeller plate, and all the short blades are arranged on the first impeller plate, and the long blades and the short blades are respectively welded and fixed to the first impeller plate and the second impeller plate, so that a centrifugal effect is generated when the water flow just enters, thereby increasing the flow rate and the head. At the same time, the long blades and the short blades are all arranged on the second impeller plate, which can better shape the highest point.

[0009] As a preferred solution, a welding groove for accommodating the upper surfaces of long blades and short blades is provided on the lower plate surface of the first impeller plate, or a welding groove for accommodating long blades is provided on the first impeller plate, and a welding groove for accommodating short blades is provided on the second impeller plate, and the upper surfaces of the long blades and the short blades are provided with strip convex ribs for facilitating welding and melting, and the width of the strip convex ribs is smaller than the width of the long blades and the short blades, and the welding groove is provided with a plurality of transverse convex ribs spanning the welding groove in the width direction, and the transverse convex ribs are discretely arranged and cooperate with the strip convex ribs, so that the strip convex ribs and the transverse convex ribs can melt better and faster and integrate into the welding groove during welding, and the welding is more firm.

[0010] As a preferred solution, the shape of the short blade is the same as the shape of the blade of the corresponding length section in the long blade. In this way, the centrifugal force exerted on the long blade and the short blade when the water flows through the flow channel is the same, thus ensuring the stability of the water flow and avoiding mutual interference caused by different directions of the outlet water flow.

[0011] As a preferred solution, an annular water stop ring is also provided on the upper plate surface of the first impeller plate, and an annular groove for accommodating the water stop ring is provided on the upper cover. In this way, the annular groove and the water stop ring cooperate with each other to avoid backflow and further improve the efficiency of the water pump.

[0012] As a preferred solution, the inlet angle of the long blade is 25-28°, and the outlet angle of the long blade is 21-23°. By optimizing the inlet angle and the outlet angle, the head of the water pump is higher and the flow head curve is smoother; it also avoids the phenomenon that the head of the electronic water pump is too high and causes a hump in the flow head curve.

[0013] As a preferred solution, the stator assembly includes a stator core, a stator winding and a plastic stator inner shell, the stator core and the stator winding are embedded in the stator inner shell, the stator inner shell is provided with the sealing sleeve, the center of the sealing sleeve is embedded with a central axis, the upper end of the stator inner shell is also provided with a lower flange portion adapted to the upper cover of the water pump, a heat dissipation metal plate is fixed to the bottom of the stator inner shell, a convex ring protruding upward and a capacitor installation protrusion protruding upward are provided on the heat dissipation metal plate, the capacitor installation protrusion forms a capacitor installation cavity for installing the capacitor, a plug-in opening is provided at the bottom of the capacitor installation cavity, the convex ring is sealed with the stator inner shell, a connecting hole connected to the inside of the convex ring is provided at the bottom of the sealing sleeve, a PCBA board is fixed to the bottom of the heat dissipation metal plate, the capacitor on the PCBA board is plugged into the capacitor installation cavity from the plug-in opening, and thermal conductive glue is filled between the capacitor and the cavity wall of the capacitor installation cavity. When the power of the water pump increases, the heat generated by the capacitor on the PCBA board will also increase. At this time, since a capacitor mounting protrusion protruding upward is provided on the heat dissipation metal plate and a capacitor mounting cavity is formed, the heat of the capacitor will be conducted to the capacitor mounting protrusion. At the same time, a connecting hole connected to the inside of the protruding ring is provided at the bottom of the sealing spacer. Therefore, when the water pump is working, the fluid will enter the protruding ring through the connecting hole and then flow out. In this way, the fluid will take away the heat of the heat dissipation metal plate, and the heat of the capacitor will be actively taken away, thereby meeting the heat dissipation requirements of higher power water pumps, and the exterior of the entire brushless electronic water pump becomes neater, without the protruding parts of the capacitor, and the overall axial height will also be reduced.

[0014] As a preferred solution, the stator inner shell is provided with a plurality of clamping cavities for supporting the stator core from the inside, the bottom of the clamping cavity is through and the upper end is a blind end. During the injection molding process of the stator assembly, the stator core and the windings wound on the stator core need to be clamped in the injection molding cavity, and the clamping fixture supports the clamping cavity formed after the stator core is injected from the inside to the outside, so that no convex ribs are formed on the outer surface of the shell to avoid the clamping fixture, so that the overall stator assembly is more compact, and the stator assembly can be fixed more conveniently without convex ribs on the outer surface.

[0015] As a preferred solution, the stator assembly includes a stator core, a stator winding and a plastic stator inner shell, the stator core and the stator winding are embedded in the stator inner shell, the stator inner shell is provided with the sealing sleeve, the center of the sealing sleeve is embedded with a central axis, the upper end of the stator inner shell is also provided with a lower flange portion adapted to the upper cover of the water pump, the bottom of the stator inner shell is fixed with a conductive bracket, the conductive bracket is embedded with three stator connecting plates and one grounding connecting plate, the stator connecting plates are one-to-one with the three-phase connecting plates on the stator winding should be connected; a connector is provided on the lower cover, and connector pins are provided in the connector, which are connected to three stator connecting plates and one ground connecting plate in a one-to-one correspondence. Therefore, the stator assembly of this solution does not include a PCBA board, and the three-phase connecting plates of the three-phase winding of the stator are directly connected to the external control through the conductive bracket. In this way, the electronic water pump can be controlled by connecting with the external controller only through the connector, which is more suitable for the current requirements of highly integrated control on automobiles. In addition, the stator assembly does not have a PCBA board and a heat dissipation metal plate, and the overall axial size is smaller.

[0016] As a preferred solution, the conductive bracket includes a bracket plate made of an insulating material, the bracket plate is provided with a positioning hole, the outer periphery of the bracket plate is provided with a clamping notch, the stator inner shell is provided with a clamping protrusion, a support step and a positioning column, the positioning column is inserted into the positioning hole, the clamping protrusion is clamped into the clamping notch, and the support step supports the plate surface of the bracket plate. The conductive bracket is very convenient to fix, and the positioning is convenient for positioning by using the positioning column and the positioning hole. The support step and the clamping protrusion can be effectively clamped and supported, and at the same time, it can be well fixed and connected in combination with the three-phase connecting plate and the stator connecting plate.

[0017] After adopting the above technical scheme, the effect of the present invention is: since the blades include a plurality of long blades and short blades, every two long blades and one short blade or every long blade and one short blade form a blade group, and each blade group is evenly distributed around the central circumference of the central water inlet pipe; when the blade group includes two long blades and one short blade, the two long blades in each blade group are arranged at intervals, and the long blades in each blade group extend spirally from the central water inlet pipe to the outer contour of the water pump impeller, and the short blades in each blade group are between the two long blades in the same group; when the blade group includes one long blade and one short blade, all long blades and short blades are alternately and evenly distributed around the circumference at equal intervals; the short blades extend spirally from the middle of the long blade to the outer contour of the water pump impeller The water outlet window is formed at the outer ends of adjacent long blades, the outer ends between the long blades and the short blades, and between the first impeller plate and the second impeller plate. Therefore, the blades near the central water inlet pipe are actually long blades, and the spacing between the inner ends of the long blades is relatively sparse, so that there is a larger water flow space when the water flows in from the central water inlet pipe, and when the water flows into the short blades, the flow rate and pressure of the water flow out can be increased due to the presence of the short blades, so that sufficient water outlet flow rate and water outlet pressure can be guaranteed. Compared with other impellers with the same total number of blades, the water pump impeller in the present invention further increases the amount of water entering while ensuring sufficient water outlet flow rate and water outlet pressure, thereby improving the efficiency of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 is a stereogram of embodiment 1 of the present invention;

[0020] Figure 2 is a side schematic diagram of embodiment 1 of the present invention;

[0021] Figure 3 yes Figure 2 Sectional view at AA;

[0022] Figure 4 is a three-dimensional diagram of the stator assembly in Embodiment 1;

[0023] Figure 5 is another stereoscopic view of the stator assembly in Embodiment 1;

[0024] Figure 6 is a top view of the stator assembly in Example 1;

[0025] Figure 7 yes Figure 6 Cross-sectional view at BB;

[0026] Figure 8is a three-dimensional diagram of the stator assembly with the PCBA board hidden in Example 1;

[0027] Fig. 9 is a three-dimensional diagram of the heat dissipation metal plate in Example 1;

[0028] Fig.10 yes Fig. 9 Cross-sectional view at CC;

[0029] Fig.11 is a three-dimensional diagram of the rotor impeller assembly in Example 1;

[0030] Fig.12 is an axial cross-sectional view of the rotor impeller assembly in Embodiment 1;

[0031] Fig.13 is a stereoscopic view of the impeller in Example 1;

[0032] Fig.14 is a three-dimensional diagram of the first impeller plate in Example 1;

[0033] Fig.15 is a perspective view of the second impeller plate in Example 1;

[0034] Fig.16 is a top view of the second impeller plate in Example 1;

[0035] Fig.17 1 is a comparison diagram of the lift and efficiency of the impeller in the embodiment of the present invention and the background technology;

[0036] Fig.18 is an axial cross-sectional view of the electronic water pump in Example 2;

[0037] Fig.19 is a three-dimensional diagram of Example 2 after the lower cover is hidden;

[0038] Fig. 20 is a three-dimensional diagram of the second impeller plate in Example 2;

[0039] In the accompanying drawings: 1. Electronic water pump 1;

[0040] 100, stator assembly; 101, housing; 102, lower flange; 103, plug; 104, center axis; 105, PCBA board; 1051, capacitor; 106, stator core; 107, connecting hole; 108, stator inner shell; 109, sealing spacer; 110, heat dissipation metal plate; 1101, protruding ring; 1102, capacitor installation protrusion; 1103, capacitor installation cavity; 111, glue filling cavity; 112, clamping cavity; 113, clamping protrusion; 114, supporting step; 115, positioning column; 116, three-phase connecting piece;

[0041] 200, impeller; 201, first impeller plate; 2011, welding groove; 2012, positioning socket; 2013, transverse rib; 202, second impeller plate; 2021, rotor sleeve; 20211, covering portion; 203, central water inlet; 204, water outlet window; 205, water stop ring; 206, long blade; 2061, twisted upper surface; 2062, inner inclined surface; 2063, highest point; 207, short blade; 208, strip rib; 209, positioning protrusion; 210, magnetic ring; 211, yoke cylinder; 212, wear-resistant insert;

[0042] 300, upper cover 3; 301, water inlet; 302, water outlet; 303, annular groove; 400, lower cover; 401, connector; 500, conductive bracket; 501, stator connecting piece; 502, grounding connecting piece; 503, connector pin; 504, card-mounting notch; 600, grounding spring. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below through specific examples.

[0044] Example 1

[0045] like Figures 1 to 3 As shown, a novel brushless electronic water pump 1 comprises a housing 101, an upper cover 300 is arranged at the upper end of the housing 101, a lower cover 400 is arranged at the lower end of the housing 101, a stator assembly 100 is installed in the housing 101, a sealing spacer 109 is arranged in the housing 101, a rotor assembly mounting cavity is arranged in the sealing spacer 109, a rotor impeller 200 assembly is rotatably mounted in the rotor assembly mounting cavity, an area between the sealing spacer 109 and the upper cover 300 constitutes a fluid chamber, an impeller 200 of the rotor impeller 200 assembly is located in the fluid chamber, and a water inlet 301 and a water outlet 302 are arranged on the upper cover 300.

[0046] like Figures 4 to 10As shown, the stator assembly 100 includes a stator core 106, a stator winding and a plastic stator inner shell 108. The stator core 106 and the stator winding are embedded in the stator inner shell 108. The stator inner shell 108 is provided with the sealing spacer 109. In this embodiment, the stator inner shell 108 and the outer shell 101 are integrally formed, and the sealing spacer 109 is formed by the inner cavity of the stator inner shell 108. The center of the sealing spacer 109 is embedded with a central axis 104, and the upper end of the stator inner housing 108 is also provided with a lower flange 102 adapted to the upper cover 300 of the water pump, and a heat dissipation metal plate 110 is fixed to the bottom of the stator inner housing 108. The heat dissipation metal plate 110 is provided with an upwardly protruding protruding ring 1101 and an upwardly protruding capacitor installation protrusion 1102, and the capacitor installation protrusion 1102 forms a capacitor installation cavity 1103 for installing the capacitor 1051, as shown in FIG. Fig.10 As shown, the inner side of the capacitor installation protrusion 1102 is connected to the protruding ring 1101 , and the inner protruding ring forms the inner wall of the capacitor installation cavity 1103 .

[0047] An insertion opening is provided at the bottom of the capacitor installation cavity 1103, the protruding ring 1101 is sealed with the stator inner shell 108, a connecting hole 107 connected with the inside of the protruding ring 1101 is provided at the bottom of the sealing spacer 109, a PCBA board 105 is fixed to the bottom of the heat dissipation metal plate 110, the capacitor 1051 on the PCBA board 105 is inserted into the capacitor installation cavity 1103 through the insertion opening, and thermal conductive glue is filled between the capacitor 1051 and the cavity wall of the capacitor installation cavity 1103. During operation, the heat of the capacitor 1051 will be conducted to the capacitor mounting protrusion 1102. At the same time, a connecting hole 107 connected to the inside of the protruding ring 1101 is provided at the bottom of the sealing spacer 109. The fluid in the water pump will enter the protruding ring 1101 through the connecting hole 107 and then flow out. The fluid will take away the heat of the heat dissipating metal plate 110, so that the heat of the capacitor 1051 is actively taken away, thereby meeting the heat dissipation requirements of higher power water pumps.

[0048] like Figure 8 As shown, the stator inner shell 108 is provided with a plurality of clamping cavities 112 for supporting the stator core 106 from the inside, and the bottom of the clamping cavity 112 is through and the upper end is a blind end. During the injection molding process of the stator assembly 100, the stator core 106 and the windings wound on the stator core 106 need to be clamped in the injection molding cavity, and the clamping fixture supports the stator core 106 from the inside to the outside. The clamping cavity 112 formed after the injection molding, so that no convex ribs for avoiding the clamping fixture are formed on the outer surface of the shell 101, so that the overall stator assembly 100 is more compact, and at the same time, the stator assembly 100 has no convex ribs on the outer surface, so that it can be fixed more conveniently.

[0049] In this embodiment, the stator inner shell 108, the outer shell 101 and the sealing spacer 109 are all integrally formed.

[0050] In this embodiment, the three-phase harness winding on the stator winding is connected to the three-phase connecting piece 116, and the three-phase connecting piece 116 is directly connected to the PCBA board 105 and controlled by the PCBA board 105. The shell 101 is also provided with a plug 103 for easy connection with the vehicle. The area where the plug 103 is located inside the shell is provided with a glue filling cavity 111, which can seal the connecting piece inside the plug 103 to improve the sealing performance.

[0051] like Figures 11 to 17 As shown, the upper and lower parts mentioned in this embodiment are the water pump impeller 200 according to Fig.12 The first impeller plate 201 is located above the second impeller plate 202, and the inner side mentioned in this embodiment refers to the side close to the center of the water pump impeller 200 as the inner side, and the side away from the center as the outer side.

[0052] The impeller 200 includes a first impeller plate 201, a second impeller plate 202, and blades connecting the first impeller plate 201 and the second impeller plate 202. The impeller 200 in this embodiment is made of plastic.

[0053] A fluid-driven chamber is formed between the first impeller plate 201 and the second impeller plate 202. A central water inlet pipe opening 203 communicating with the fluid-driven chamber is provided at the center of the first impeller plate 201. The central water inlet pipe opening corresponds to the water inlet 301 on the upper cover 300. The blades divide the fluid-driven chamber into a plurality of flow channels. An outer contour between the first impeller plate 201 and the second impeller plate 202 is provided with a water outlet window 204 communicating with each flow channel.

[0054] The second impeller plate 202 is provided with a rotor sleeve 2021, and the rotor sleeve 2021 is provided with a rotor magnetic ring assembly 210 that cooperates with the stator assembly 100. Fig.12 As shown, a wear-resistant insert 212 is provided inside the rotor sleeve 2021 to facilitate rotational cooperation with the central shaft 104 . The main structure of the rotor magnetic ring assembly 210 includes a yoke tube 211 and a magnetic ring 210 , and both the yoke tube 211 and the magnetic ring 210 are covered by the rotor sleeve 2021 .

[0055] like Figures 14 to 16As shown, the blades include a plurality of long blades 206 and short blades 207, and every two long blades 206 and one short blade 207 form a blade group, and each blade group is evenly distributed around the central circumference of the central water inlet pipe port 203. The two long blades 206 in each blade group are arranged at intervals, and the long blades 206 in each blade group spirally extend from the central water inlet pipe port 203 to the outer contour of the water pump impeller 200. The short blades 207 in each blade group are located between the two long blades 206 in the same group, and the short blades 207 spirally extend from the middle of the long blades 206 to the outer contour of the water pump impeller 200. The outer peripheral ends between adjacent long blades 206, the outer peripheral ends between the long blades 206 and the short blades 207, and between the first impeller plate 201 and the second impeller plate 202 form the water outlet window 204.

[0056] Preferably, the long blade 206 is a twisted blade, and an inner bevel 2062 is provided on the inner side of the long blade 206, and the inner bevel 2062 and the twisted upper surface 2061 of the long blade 206 intersect to form a highest point 2063, and the highest point 2063 extends to the inner wall of the central water inlet pipe port 203, and the long blade 206 and the short blade 207 are both provided on the upper plate surface of the second impeller plate 202 and are integrally formed with the second impeller plate 202, and the long blade 206 and the short blade 207 are welded and fixed to the lower plate surface of the first impeller plate 201. In this embodiment, the number of the long blades 206 is six, and the number of the short blades 207 is three, and the shape of the short blade 207 is the same as the shape of the blade of the corresponding length segment in the long blade 206. The distance between the outer end of the short blade 207 in each blade group and the outer end of the adjacent long blade 206 is equal, and the short blade 207 divides the channel between the adjacent long blades 206 into two equal flow channels. The highest point of the long blade 206 is closer to the central water inlet 203, so that a centrifugal effect is generated when the water just enters, thereby increasing the flow rate and the head. At the same time, the long blade 206 and the short blade 207 are both arranged on the second impeller plate 202, which can better shape the highest point 2063.

[0057] The lower plate surface of the first impeller plate 201 is provided with a welding groove 2011 for accommodating the upper surface of the long blade 206 and the short blade 207. The upper surface of the long blade 206 and the short blade 207 is provided with a strip convex rib 208 for convenient welding and melting. The width of the strip convex rib 208 is smaller than the width of the long blade 206 and the short blade 207. The welding groove 2011 is provided with a plurality of transverse convex ribs 2013 that cross the welding groove 2011 in the width direction. The transverse convex ribs 2013 are discretely arranged and matched with the strip convex rib 208. During welding, the strip convex rib 208 and the transverse convex rib 2013 can be melted better and faster and integrated into the welding groove 2011, and the welding is more firm. In order to facilitate the better and more accurate matching of the strip convex rib 208 and the welding groove 2011, a positioning protrusion 209 is provided on the strip convex rib 208, and a positioning socket 2012 is provided in the corresponding welding groove 2011, so as to better facilitate the assembly of the two.

[0058] The shape of the short blade 207 is the same as the blade shape of the corresponding length section of the long blade 206. When the water flows through the circulation channel, the centrifugal force of the long blade 206 and the short blade 207 is the same, which ensures the stability of the water flow and avoids mutual interference caused by different outlet water flow directions.

[0059] In this embodiment, due to the existence of the highest point 2063, all long blades 206 and short blades 207 are arranged on the second impeller plate 202 and are integrally formed with the second impeller plate 202. Similarly, an annular water stop ring 205 is also arranged on the upper plate surface of the first impeller plate 201. The rotor sleeve 2021 is integrally formed with the second impeller plate 202, and the lower part of the rotor sleeve 2021 is provided with a covering part 20211, and the covering part 20211 covers the yoke tube 211 and the magnetic ring 210. The second impeller plate 202 and the first impeller plate 201 are then welded in combination by a welding process, wherein the transverse ribs 2013 and the strip ribs 208 are conveniently welded to make them melt faster, and the molten thickness fluid will fill the welding groove 2011, thereby ensuring the quality of welding.

[0060] An annular water stop ring 205 is also provided on the upper plate surface of the first impeller plate 201, and an annular groove 303 for accommodating the water stop ring 205 is provided on the upper cover 300. In this way, the annular groove 303 and the water stop ring 205 cooperate with each other to avoid backflow, so that the liquid flowing in from the central water inlet pipe 203 will all flow out from the water outlet 302, avoiding liquid backflow affecting the water inlet amount and improving the efficiency of the water pump.

[0061] In this embodiment, the inlet angle of the long blade 206 is 25-28°, and the outlet angle of the long blade 206 is 21-23°. By optimizing the inlet angle and the outlet angle, the head of the water pump is higher and the flow head curve is smoother; it also avoids the phenomenon that the head of the electronic water pump 1 is too high and causes a hump in the flow head curve.

[0062] The inlet angle is defined as α, and the determination of the inlet angle is as follows: the intersection point where the blade contour extension line of the inner end of the long blade 206 intersects with the contour of the central water inlet pipe port 203 is defined as the inner intersection point, and the tangent line of the blade contour extension line is made through the inner intersection point to form an inner contour tangent line. At the same time, the tangent line of the contour of the central water inlet pipe port 203 is made through the inner intersection point to form a rotation direction line. The inlet angle α is the angle between the inner contour tangent line and the rotation direction line. Preferably, the inlet angle is 27°.

[0063] The outlet angle is defined as β, which is determined as follows: the tangent of the contour line of the outer end of the long blade 206 is defined as the outer contour tangent, and the intersection angle between the rotation direction line passing through the tangent point of the outer contour tangent and the contour line and the outer contour tangent is the outlet angle.

[0064] The water pump impeller 200 in the embodiment of the present invention is compared with the technical solution of the background technology with the same long blades 206. The exclusion coefficient of the solution in the background technology is too high, which will cause blockage and flow separation in the inlet flow channel, and thus it is difficult to improve the overall efficiency of the impeller 200. In the present embodiment, due to the use of the setting of long blades 206 and short blades 207, it can prevent flow separation and flow channel blockage while improving cavitation performance, thereby improving the efficiency of the impeller 200.

[0065] like Fig.17 As shown in the figure, it can be found from the relationship diagram between flow rate, efficiency and head in the figure that the original comparison scheme adopts a scheme with 8 long blades 206, while the scheme in this embodiment adopts a scheme with 6 long blades 206 and 3 short blades 207, a total of 9 blades. The maximum design speed of the impeller 200 in the original comparison scheme is 6800rpm, and the maximum design speed of the impeller 200 in this embodiment is 6050rpm. Fig.17 Relationship diagram in

[0066] in Fig.17 It can be found that under the standard flow rate of 1440L / h, the speed of the impeller 200100 in this embodiment is reduced by 750rpm and the head is still increased, and the head is increased by nearly 3m. At the same time, at a lower speed, the efficiency under the standard flow rate is guaranteed to be higher than that of the original comparison scheme.

[0067] Example 2

[0068] like Fig.18 and Fig.19 As shown, the brushless electronic water pump 1 in this embodiment has a substantially identical structure to that in Embodiment 1, except that the impeller 2 and the stator assembly 100 in this embodiment are different from those in Embodiment 1. The stator assembly 100 in this embodiment is not configured with a PCBA board 105, and therefore, there is no need to configure a heat dissipation metal plate 110. The entire brushless electronic water pump 1 is directly controlled by the vehicle's main control.

[0069] like Fig. 20 As shown, the impeller group in the impeller 2 in this embodiment includes a long blade 206 and a short blade 207, and all the long blades 206 and short blades 207 are alternately and evenly distributed around the circumference; and in this embodiment, there are eight long blades 206 and short blades 207 in total, and the long blades 206 are all arranged on the second impeller plate 202, and all the short blades 207 are arranged on the first impeller plate 201, and the long blades 206 and short blades 207 are respectively welded and fixed to the first impeller plate 201 and the second impeller plate 202. The first impeller plate 201 is provided with a welding groove 2011 for accommodating the long blades 206, and the second impeller plate 202 is provided with a welding groove 2011 for accommodating the short blades 207.

[0070] In this embodiment, the stator assembly 100 includes a stator core 106, a stator winding and a plastic stator inner shell 108, the stator core 106 and the stator winding are embedded in the stator inner shell 108, the stator inner shell 108 is provided with the sealing spacer 109, the center of the sealing spacer 109 is embedded with the central axis 104, the upper end of the stator inner shell 108 is also provided with a lower flange 102 adapted to the upper cover 300 of the water pump, the bottom of the stator inner shell 108 is fixed with a conductive bracket 500, and the conductive bracket 500 is embedded with three stator connecting plates 501 and a grounding connecting plate 502, the stator connecting piece 501 is welded and fixedly connected with the three-phase connecting piece 116 on the stator winding in a one-to-one correspondence; the lower cover 400 is provided with a plug 401, and the plug 401 is provided with plug pins 503 connected with three stator connecting pieces 501 and one grounding connecting piece 502 in a one-to-one correspondence. When in use, the electronic water pump 1 can be controlled to work by plugging the plug 401 with an external controller on the vehicle, which is more suitable for the current requirements of highly integrated control on automobiles, and the stator assembly 100 does not have a PCBA board 105 and a heat dissipation metal plate 110, and the overall axial size is smaller.

[0071] like Fig.18As shown, the conductive support 500 includes a support plate made of insulating material, the support plate is provided with two positioning holes, the outer periphery of the support plate is provided with a clamping notch 504, the stator inner shell 108 is provided with a clamping protrusion 113, a support step 114 and a positioning column 115, the positioning column 115 is inserted into the positioning hole, the clamping protrusion 113 is clamped into the clamping notch 504, and each clamping protrusion 113 is provided with the support step 114, so that the board surface of the support plate is supported while being clamped. The grounding connecting piece 502 in this embodiment can be directly grounded to the stator core 106 through a grounding spring 600 provided in the stator inner shell 108. The conductive bracket 500 is very convenient to fix. The positioning column 115 and the positioning hole are used for convenient positioning. The support step 114 and the clamping protrusion 113 can be effectively clamped and supported. At the same time, the three-phase connecting plate 116 and the stator connecting plate 501 can be well fixed and connected.

[0072] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A novel brushless electronic water pump, comprising a housing, an upper cover is provided at the upper end of the housing, a lower cover is provided at the lower end of the housing, a stator assembly is installed in the housing, a sealing sleeve is provided in the housing, a rotor assembly installation cavity is provided in the sealing sleeve, a rotor impeller assembly is rotatably installed in the rotor assembly installation cavity, an area between the sealing sleeve and the upper cover constitutes a fluid chamber, an impeller of the rotor impeller assembly is located in the fluid chamber, a water inlet and a water outlet are provided on the upper cover, and the pump is characterized in that: The impeller comprises a first impeller plate, a second impeller plate and blades connected between the first impeller plate and the second impeller plate, a fluid driving chamber is formed between the first impeller plate and the second impeller plate, a central water inlet pipe opening communicating with the fluid driving chamber is arranged at the center of the first impeller plate, the central water inlet pipe opening corresponds to the water inlet on the upper cover, the blades divide the fluid driving chamber into a plurality of flow channels, an outer contour between the first impeller plate and the second impeller plate is provided with a water outlet window communicating with each flow channel, the second impeller plate is provided with a rotor sleeve, a rotor magnetic ring assembly matched with the stator assembly is arranged on the rotor sleeve, characterized in that: the blades comprise a plurality of long blades and short blades, and every two long blades and one short blade The blades or each long blade and a short blade form a blade group, and each blade group is evenly distributed around the central circumference of the central water inlet pipe; when the blade group includes two long blades and one short blade, the two long blades in each blade group are arranged at intervals, the long blades in each blade group spirally extend from the central water inlet pipe to the outer contour of the water pump impeller, and the short blades in each blade group are between the two long blades in the same group; when the blade group includes a long blade and a short blade, all long blades and short blades are alternately and evenly distributed around the circumference; the short blades spirally extend from the middle of the long blades to the outer contour of the water pump impeller, and the outer peripheral ends between adjacent long blades, the outer peripheral ends between the long blades and the short blades, and between the first impeller plate and the second impeller plate form the water outlet window.

2. A new type of brushless electronic water pump as claimed in claim 1, characterized in that: The long blade is a twisted blade, an inner side of the long blade is provided with an inner side slope, the inner side slope and the twisted upper surface of the long blade intersect to form a highest point, the highest point extends to the inner wall of the central water inlet pipe opening, the long blade and the short blade are both provided on the upper plate surface of the second impeller plate and are integrally formed with the second impeller plate, and the long blade and the short blade are welded and fixed to the lower plate surface of the first impeller plate; Alternatively, the long blades are all arranged on the second impeller plate, and all the short blades are arranged on the first impeller plate, and the long blades and the short blades are respectively welded and fixed to the first impeller plate and the second impeller plate.

3. A new type of brushless electronic water pump as claimed in claim 2, characterized in that: A welding groove for accommodating the upper surfaces of long blades and short blades is provided on the lower plate surface of the first impeller plate, or a welding groove for accommodating long blades is provided on the first impeller plate, and a welding groove for accommodating short blades is provided on the second impeller plate, and strip convex ribs for facilitating welding and melting are provided on the upper surfaces of the long blades and the short blades, and the width of the strip convex ribs is smaller than the width of the long blades and the short blades, and a plurality of transverse convex ribs are provided on the welding groove to cross the welding groove in the width direction, and the transverse convex ribs are discretely arranged and cooperate with the strip convex ribs.

4. A new type of brushless electronic water pump as claimed in claim 3, characterized in that: The shape of the short blade is the same as the shape of the blade of the corresponding length section in the long blade.

5. A new type of brushless electronic water pump as claimed in claim 4, characterized in that: An annular water stop ring is also provided on the upper plate surface of the first impeller plate, and an annular groove for accommodating the water stop ring is provided on the upper cover.

6. A new type of brushless electronic water pump as claimed in claim 5, characterized in that: The inlet angle of the long blade is 25-28°, and the outlet angle of the long blade is 21-23°.

7. A new type of brushless electronic water pump as claimed in claim 1, characterized in that: The stator assembly comprises a stator core, a stator winding and a plastic stator inner shell, wherein the stator core and the stator winding are embedded in the stator inner shell, the stator inner shell is provided with the sealing sleeve, the center of which is embedded with a central axis, the upper end of the stator inner shell is also provided with a lower flange portion adapted to the upper cover of the water pump, a heat dissipation metal plate is fixed to the bottom of the stator inner shell, a convex ring protruding upward and a capacitor installation protrusion protruding upward are provided on the heat dissipation metal plate, the capacitor installation protrusion forms a capacitor installation cavity for installing a capacitor, a plug-in opening is provided at the bottom of the capacitor installation cavity, the convex ring is sealed with the stator inner shell, a connecting hole connected to the inside of the convex ring is provided at the bottom of the sealing sleeve, a PCBA board is fixed to the bottom of the heat dissipation metal plate, the capacitor on the PCBA board is plugged into the capacitor installation cavity from the plug-in opening, and thermal conductive glue is filled between the capacitor and the cavity wall of the capacitor installation cavity.

8. A new type of brushless electronic water pump as claimed in claim 7, characterized in that: The stator inner shell is provided with a plurality of clamping cavities for supporting the stator core from the inside, the bottom of the clamping cavity is through and the upper end is a blind end.

9. A new type of brushless electronic water pump as claimed in claim 1, characterized in that: The stator assembly includes a stator core, a stator winding and a plastic stator inner shell, wherein the stator core and the stator winding are embedded in the stator inner shell, the stator inner shell is provided with the sealing sleeve, the center of which is embedded with a central axis, the upper end of the stator inner shell is also provided with a lower flange portion adapted to the upper cover of the water pump, a conductive bracket is fixed to the bottom of the stator inner shell, three stator connecting plates and one grounding connecting plate are embedded in the conductive bracket, and the stator connecting plates are connected one-to-one with the three-phase connecting plates on the stator winding; a connector is provided on the lower cover, and connector pins connected one-to-one with the three stator connecting plates and one grounding connecting plate are provided in the connector.

10. A new type of brushless electronic water pump as claimed in claim 9, characterized in that: The conductive bracket includes a bracket plate made of insulating material, a positioning hole is provided on the bracket plate, a clamping notch is provided on the outer periphery of the bracket plate, a clamping protrusion, a supporting step and a positioning column are provided on the stator inner shell, the positioning column is inserted into the positioning hole, the clamping protrusion is clamped into the clamping notch, and the supporting step supports the plate surface of the bracket plate.

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