Novel brushless electronic water pump

Abstract

The utility model discloses a novel brushless electronic water pump which 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 utility model relates to electronic water pump technical field especially relates to a novel brushless electronic water pump. BACKGROUND

[0002] Electronic water pump is driven by rotor and stator between the magnetic effect can be used on the vehicle impeller rotation. And the current electronic water pump mainly includes rotor impeller assembly and stator assembly and shell, the applicant applied for a kind of high-power brushless electronic water pump's rotor assembly and its installation structure on November 2, 2020, and the utility model patent is authorized and announced as CN213870317U, the patent text records a kind of rotor assembly, including impeller, further including rotor shaft sleeve, the impeller is fixed on the upper end of rotor shaft sleeve, the inner hole of the upper and lower ends of rotor shaft sleeve is respectively concentrically embedded with upper wear-resistant lubricating insert and lower wear-resistant lubricating insert, the upper wear-resistant lubricating insert and lower wear-resistant lubricating insert are provided with the central hole concentrically arranged with the inner hole of rotor shaft sleeve, the outer periphery of rotor shaft sleeve is fixed with rotor core, the outer periphery of rotor core is evenly distributed with several sintered boron magnetic steel, the outside of rotor shaft sleeve is fixed with rotor shell cover, which wraps rotor core and sintered neodymium iron boron magnetic steel.

[0003] The applicant applied for a kind of brushless electronic water pump's stator assembly in 202221087721.7, the stator assembly, including the shell of plastic and the stator assembly fixed in shell, the stator assembly includes stator core, stator winding and the stator inner shell body of plastic, and utilize ground spring sheet extrusion between stator core and shell and contact with heat dissipation metal plate, realize the ground simultaneously also can carry out heat conduction.

[0004] However, the electronic water pump has the following disadvantages: 1. The impeller includes a lower impeller half and an upper impeller half, the lower impeller half and the upper impeller half are connected by plug-in fit, the upper impeller half is provided with blades, and the lower impeller half is provided with grooves matched with the shape of the blades. The entire blade has the same length and is uniformly distributed in the circumference, and the efficiency of the current impeller is difficult to improve due to the size limitation of the rotor assembly; 2. When the rotor assembly is used, there is a gap between the impeller and the upper cover for facilitating rotation of the rotor, and a part of the liquid originally flowing out of the outlet of the impeller will flow back to the central water inlet through the gap, thereby causing the efficiency of the impeller to be relatively low; 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 PCBA board of the stator assembly of the water pump is connected with a capacitor, the current capacitor is arranged towards the back (down), and the heat generated by the capacitor is mainly passively dissipated through the lower cover, but as the power of the water pump increases, the passive dissipation cannot meet the passive dissipation requirements; 4. The current water pump stator assembly is generally clamped from the outside of the stator core during injection molding, so that the outer part of the water pump shell is provided with an outwardly protruding convex strip, which is formed by the stator core clamping fixture, so that the overall outer dimension of the water pump stator assembly is relatively large, and the convex strip also affects the subsequent fixation of the water pump. Practical new type content

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

[0006] The utility model discloses a novel brushless electronic water pump, including the shell, the upper end of shell is provided with the upper cover, the lower end of shell is provided with the lower cover, installs stator assembly in the shell, is provided with the sealed spacer sleeve in the shell, is provided with rotor assembly installation cavity in the sealed spacer sleeve, rotates and installs rotor impeller assembly in rotor assembly installation cavity, the area between sealed spacer sleeve with the upper cover constitutes the fluid chamber, and the impeller of rotor impeller assembly is located in the fluid chamber, is provided with water inlet and water outlet on the upper cover, its characterized in that: the impeller includes first impeller board, second impeller board and the blade between connecting first impeller board and second impeller board, forms the fluid drive chamber between first impeller board and second impeller board, the center of first impeller board is provided with the center water inlet pipe mouth that communicates with the fluid drive chamber, the center water inlet pipe opens in the water inlet of upper cover correspondence, the blade divides the fluid drive chamber into several flow channels, and the outer contour between first impeller board and second impeller board is provided with the water outlet window that communicates with each flow channel, the second impeller board is provided with rotor shaft sleeve, and the rotor magnetic ring assembly that is matched with stator assembly is provided on rotor shaft sleeve, its characterized in that: the blade includes several pieces long blade and short blade, and every two pieces long blade and a piece short blade or every piece long blade and a piece short blade form a group of blade group, and each blade group is evenly distributed with the center circle of center water inlet pipe mouth;When the blade group contains two pieces long blade and a piece short blade, two pieces long blade in each blade group are arranged at intervals, and the short blade in each blade group is between the two long blades in the same group;When the blade group contains a piece long blade and a piece short blade, all long blades and short blades are alternately and equally spaced circle distributed;The short blade is spirally extended from the middle of long blade to the outer contour of water pump impeller, and the peripheral end between adjacent long blades, the peripheral end between long blade and short blade and the water outlet window between first impeller board and second impeller board are formed.

[0007] As a preferred scheme, the long blade is a twisted blade, the 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 part, the highest point part extends to the inner wall of the center water inlet pipe, the long blade and the short blade are arranged on the upper plate surface of the second impeller board and are integrally formed with the second impeller board, and the long blade and the short blade are welded and fixed with the lower plate surface of the first impeller board.

[0008] Or the long blades are arranged on the second impeller plate, all the short blades are arranged on the first impeller plate, and the long blades and the short blades are respectively welded and fixed with the first impeller plate and the second impeller plate, so that centrifugal effect is generated when water flow just enters, thereby improving flow and increasing lift. Meanwhile, the long blades and the short blades are arranged on the second impeller plate, so that the highest point part can be better formed.

[0009] As a preferred scheme, the lower plate surface of the first impeller plate is provided with a welding groove accommodating upper surfaces of the long blades and the short blades, or the first impeller plate is provided with a welding groove accommodating the long blades, and the second impeller plate is provided with a welding groove accommodating the short blades, upper surfaces of the long blades and the short blades are provided with strip-shaped convex ribs facilitating welding melting, the strip-shaped convex ribs have a width smaller than that of the long blades and the short blades, and the welding groove is provided with a plurality of transverse convex ribs crossing the welding groove in the width direction, the transverse convex ribs are discretely arranged and cooperate with the strip-shaped convex ribs, the strip-shaped convex ribs and the transverse convex ribs can be better and faster melted and fused into the welding groove during welding, and welding is more firm.

[0010] As a preferred scheme, the shape of the short blade is the same as that of a corresponding length section of the long blade. In this way, the centrifugal force of water flow passing through the flow passage and received by the long blades and the short blades is the same, so that water flow is ensured to be stable, and mutual interference caused by different water flow directions at the outlet is avoided.

[0011] As a preferred scheme, the upper plate surface of the first impeller plate is further provided with an annular water stop ring, and the upper cover is provided with an annular groove accommodating the water stop ring. In this way, the annular groove and the water stop ring can avoid backflow phenomenon and further improve the efficiency of the water pump.

[0012] As a preferred scheme, 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 lift of the water pump is higher, and the flow-lift curve is smoother. Also, the phenomenon that the flow-lift curve appears hump due to too high lift of the electronic water pump is avoided.

[0013] As a preferred scheme, the stator assembly comprises 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 spacer, the center of the sealing spacer is embedded with a center shaft, the upper end of the stator inner shell is also provided with a lower flange part matched with the upper cover of the water pump, the bottom of the stator inner shell is fixed with a heat dissipation metal plate, the heat dissipation metal plate is provided with an upwardly protruding protruding ring and an upwardly protruding capacitor mounting protrusion, the capacitor mounting protrusion forms a capacitor mounting cavity for mounting the capacitor, the bottom of the capacitor mounting cavity is provided with a plug-in opening, the protruding ring is in sealing fit with the stator inner shell, the bottom of the sealing spacer is provided with a communication hole in communication with the inside of the protruding ring, the bottom of the heat dissipation metal plate is fixed with a PCBA plate, the capacitor on the PCBA plate is plugged into the capacitor mounting cavity from the plug-in opening, and the capacitor and the cavity wall of the capacitor mounting cavity are filled with heat-conducting glue. When the power of the water pump increases, the heat generated by the capacitor on the PCBA plate also increases, at this time, since the heat dissipation metal plate is provided with an upwardly protruding capacitor mounting protrusion and forms a capacitor mounting cavity, the heat of the capacitor will be conducted to the capacitor mounting protrusion, and at the same time, the bottom of the sealing spacer is provided with a communication hole in communication with the inside of the protruding ring, therefore, when the water pump is working, the fluid will enter the protruding ring through the communication hole and then flow out, so that the fluid will take away the heat of the heat dissipation metal plate, so that the heat of the capacitor is actively taken away, thereby meeting the heat dissipation requirements of the water pump with higher power, and the whole brushless electronic water pump becomes more neat without the protruding part of the capacitor, and the overall axial height is also reduced.

[0014] As a preferred scheme, the stator inner shell is provided with a plurality of clamping cavities supporting the stator core from the inside, and the bottom of the clamping cavity is through and the upper end is blind. In the process of injection molding of the stator assembly, the stator core and the winding wrapped around the stator core need to be clamped in the injection cavity, and the clamping cavity formed after the clamping clamp supports the stator core from the inside after injection molding, so that the convex strip for avoiding the clamping clamp is not formed on the outer side surface of the shell, so that the overall stator assembly is more compact, and the stator assembly outer surface without convex strip can be more conveniently fixed.

[0015] As a preferred scheme, the stator assembly comprises a stator core, a stator winding and a plastic stator inner housing, the stator core and the stator winding are embedded in the stator inner housing, the stator inner housing is provided with the sealing spacer sleeve, the center of the sealing spacer sleeve is embedded with the center shaft, the upper end of the stator inner housing is further provided with the lower flange part matched with the upper cover of the water pump, the bottom of the stator inner housing is fixed with the conductive support, the conductive support is embedded with three stator connecting pieces and one grounding connecting piece, the stator connecting pieces are connected with the three-phase connecting pieces on the stator winding one by one; the lower cover is provided with a connector, the connector is provided with connector pins corresponding to the three stator connecting pieces and the one grounding connecting piece, therefore, the stator assembly of this scheme does not contain the PCBA board, the three-phase connecting pieces of the three-phase winding of the stator are directly connected with the external control through the conductive support, so that only the connector needs to be connected with the external controller to control the electronic water pump to work, thereby being more suitable for the requirement of high integration control on the current automobile, and the stator assembly does not have the PCBA board and the heat dissipation metal plate, and the overall axial size is smaller.

[0016] As a preferred scheme, the conductive support comprises a support plate made of insulating material, the support plate is provided with a positioning hole, the outer periphery of the support plate is provided with a clamping notch, the stator inner housing is provided with a clamping protrusion, a supporting 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 supporting step supports the plate surface of the support plate, the fixing of the conductive support is very convenient, the positioning column and the positioning hole are used for convenient positioning, the supporting step and the clamping protrusion can effectively clamp and support, and the three-phase connecting pieces and the stator connecting pieces can be well fixed and connected.

[0017] The utility model discloses the effect is: because the blade includes several long blade and short blade, every two long blade and a short blade or every long blade and a short blade form a group of blade group, and each blade group is evenly distributed with the center circle of center inlet pipe, when the blade group contains two long blade and a short blade, two long blade in every blade group is arranged at intervals, and the long blade in every blade group is spirally extended to the outer contour of water pump impeller, and the short blade in every blade group is between two long blade in the same group, when the blade group contains a long blade and a short blade, all long blade and short blade are alternately and equally spaced, and the short blade is spirally extended to the outer contour of water pump impeller from the middle of long blade, and the peripheral end between adjacent long blade, the peripheral end between long blade and short blade and the first impeller plate and second impeller plate form the water outlet window, therefore, the blade near the center inlet pipe is long blade actually, and the interval between the inner end of long blade is sparse, so that the water flow space is larger when the water flow enters from the center inlet pipe, and when the water flow flows into the short blade, because of the existence of short blade, the flow velocity and pressure of water flow can be increased, and the water flow velocity and water pressure are guaranteed, compared with other impellers with the same total blade number, the water flow amount of the water pump impeller in the utility model is further improved under the condition of guaranteeing the water flow velocity and water pressure, so that the efficiency of water pump is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model is further illustrated below in connection with the drawings and examples.

[0019] Figure 1 It is the perspective view of the utility model embodiment 1;

[0020] Figure 2 It is the side schematic view of the utility model embodiment 1;

[0021] Figure 3 It is Figure 2 The section view at A-A;

[0022] Figure 4 It is the perspective view of the stator assembly in example 1;

[0023] Figure 5 It is another perspective view of the stator assembly in example 1;

[0024] Figure 6 It is the plan view of the stator assembly in example 1;

[0025] Figure 7 It is Figure 6 The section view at B-B;

[0026] Figure 8is a perspective view of the stator assembly with the PCBA board hidden in example 1;

[0027] Figure 9 is a perspective view of the heat dissipation metal plate in example 1;

[0028] Figure 10 is Figure 9 is a sectional view at C-C;

[0029] Figure 11 is a perspective view of the rotor impeller assembly in example 1;

[0030] Figure 12 is an axial sectional view of the rotor impeller assembly in example 1;

[0031] Figure 13 is a perspective view of the impeller in example 1;

[0032] Figure 14 is a perspective view of the first impeller plate in example 1;

[0033] Figure 15 is a perspective view of the second impeller plate in example 1;

[0034] Figure 16 is a top view of the second impeller plate in example 1;

[0035] Figure 17 is a head and efficiency comparison chart of the impeller in the embodiment of the utility model and the background art;

[0036] Figure 18 is an axial sectional view of the electronic water pump in example 2;

[0037] Figure 19 is a perspective view after the lower cover is hidden in example 2;

[0038] Figure 20 is a perspective view of the second impeller plate in example 2;

[0039] In the drawings: 1, electronic water pump 1;

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

[0041] 200. Impeller; 201. First impeller plate; 2011. Welding groove; 2012. Positioning insertion hole; 2013. Transverse rib; 202. Second impeller plate; 2021. Rotor bushing; 20211. Covering part; 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. Magnetic yoke cylinder; 212. Wear-resistant insert;

[0042] 300, Top cover 3; 301, Inlet; 302, Outlet; 303, Annular groove; 400, Bottom cover; 401, Connector; 500, Conductive support; 501, Stator connecting piece; 502, Grounding connecting piece; 503, Connector pin; 504, Mounting notch; 600, Grounding spring. Detailed Implementation

[0043] The present invention will be further described in detail below through specific embodiments.

[0044] Example 1

[0045] like Figures 1 to 3 As shown, a novel brushless electronic water pump 1 includes a housing 101, an upper cover 300 at the upper end of the housing 101, a lower cover 400 at the lower end of the housing 101, a stator assembly 100 installed inside the housing 101, a sealing sleeve 109 inside the housing 101, a rotor assembly mounting cavity inside the sealing sleeve 109, a rotor impeller 200 assembly rotatably mounted inside the rotor assembly mounting cavity, a fluid chamber formed between the sealing sleeve 109 and the upper cover 300, and the impeller 200 of the rotor impeller 200 assembly located inside the fluid chamber, and an inlet 301 and an outlet 302 provided 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 housing 108, the stator core 106 and the stator winding are embedded in the stator inner housing 108, the stator inner housing 108 is provided with the sealing spacer 109, in this embodiment, the stator inner housing 108 and the outer shell 101 are integrally formed, and the sealing spacer 109 is formed in the inner cavity of the stator inner housing 108. The center of the sealing spacer 109 is embedded with a center shaft 104, the upper end of the stator inner housing 108 is also provided with a lower flange 102 part matched with the upper cover 300 of the water pump, the bottom of the stator inner housing 108 is fixed with a heat dissipation metal plate 110, the heat dissipation metal plate 110 is provided with an upwardly protruding protruding ring 1101 and an upwardly protruding capacitor mounting protrusion 1102, the capacitor mounting protrusion 1102 forms a capacitor mounting cavity 1103 for mounting a capacitor 1051, as Figure 10 As shown, the inner side of the capacitor mounting protrusion 1102 is connected with the protruding ring 1101, and the inner protruding ring constitutes the inner side wall of the capacitor mounting cavity 1103.

[0047] The bottom of the capacitor mounting cavity 1103 is provided with a plug-in opening, the protruding ring 1101 is sealingly connected with the stator inner housing 108, the bottom of the sealing spacer 109 is provided with a communication hole 107 in communication with the inside of the protruding ring 1101, the bottom of the heat dissipation metal plate 110 is fixed with a PCBA plate 105, the capacitor 1051 on the PCBA plate 105 is plugged into the capacitor mounting cavity 1103 from the plug-in opening, and the capacitor 1051 and the cavity wall of the capacitor mounting cavity 1103 are filled with heat-conducting glue. In operation, the heat of the capacitor 1051 is conducted to the capacitor mounting protrusion 1102, and at the same time, the bottom of the sealing spacer 109 is provided with a communication hole 107 in communication with the inside of the protruding ring 1101, the fluid in the water pump enters the protruding ring 1101 through the communication hole 107 and then flows out, and the fluid carries away the heat of the heat dissipation metal plate 110, so that the heat of the capacitor 1051 is actively carried away, thereby meeting the heat dissipation requirements of the water pump with higher power.

[0048] As shown in the figure, Figure 8 As shown, the stator inner housing 108 is provided with a plurality of clamping cavities 112 supporting the stator core 106 from the inside, the bottom of the clamping cavity 112 is through and the upper end is blind. In the process of injection molding of the stator assembly 100, the stator core 106 and the winding wrapped around the stator core 106 need to be clamped in the injection cavity, and the clamping cavity 112 is formed after the clamping clamp supports the stator core 106 from the inside after injection molding, so that there is no convex strip on the outer surface of the outer shell 101 to avoid the clamping clamp, so that the overall stator assembly 100 is more compact, and the stator assembly 100 can be more conveniently fixed without the convex strip on the outer surface.

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

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

[0051] As shown in Figures 11 to 17 , the upper and lower mentioned in this embodiment are determined according to the placement state of the water pump impeller 200 in Figure 12 , wherein the first impeller plate 201 is above the second impeller plate 202, and the inner 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 far 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, and the impeller 200 in this embodiment is made of plastic material.

[0053] The first impeller plate 201 and the second impeller plate 202 form a fluid driving chamber therebetween, the center of the first impeller plate 201 is provided with a center water inlet pipe opening 203 communicating with the fluid driving chamber, the center water inlet pipe opening corresponds to a water inlet 301 on the upper cover 300, the blades divide the fluid driving chamber into a plurality of flow channels, and the 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 shaft sleeve 2021, and the rotor shaft sleeve 2021 is provided with a rotor magnetic ring assembly 210 matched with the stator assembly 100, as shown in Figure 12 , the inside of the rotor shaft sleeve 2021 is provided with a wear-resistant insert 212, which is convenient for rotating cooperation with the center shaft 104, and the main structure of the rotor magnetic ring assembly 210 includes a magnetic yoke cylinder 211 and a magnetic ring 210, both of which are covered by the rotor shaft sleeve 2021.

[0055] As shown in Figures 14 to 16As shown, the blades include several long blades 206 and short blades 207, each two long blades 206 and one short blade 207 form a blade group, each blade group is evenly distributed in the center circumference of the center inlet 203, each long blade 206 in each blade group is spaced apart, each long blade 206 in each blade group extends spirally from the center inlet 203 to the outer contour of the water pump impeller 200, each short blade 207 in each blade group is between the two long blades 206 in the same group, the short blade 207 extends spirally from the middle of the long blade 206 to the outer contour of the water pump impeller 200, the peripheral end between adjacent long blades 206, the peripheral end between long blades 206 and short blades 207, and the first impeller plate 201 and the second impeller plate 202 form the water outlet window 204.

[0056] Preferably, the long blades 206 are twisted blades, the inner side of the long blades 206 is provided with an inner side slope 2062, the inner side slope 2062 and the twisted upper surface 2061 of the long blades 206 intersect to form a highest point part 2063, the highest point part 2063 extends to the inner wall of the center inlet 203, the long blades 206 and the short blades 207 are arranged on the upper plate surface of the second impeller plate 202 and are integrally formed with the second impeller plate 202, the long blades 206 and the short blades 207 are welded and fixed with the lower plate surface of the first impeller plate 201, in this embodiment, the number of long blades 206 is six, the number of short blades 207 is three, the shape of the short blades 207 is the same as the shape of the corresponding length of the long blades 206. The distance between the peripheral end of the short blade 207 in each blade group and the peripheral 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 center inlet 203, so that the centrifugal effect is generated as soon as the water flow enters, thereby increasing the flow and increasing the lift. At the same time, the long blades 206 and the short blades 207 are arranged on the second impeller plate 202, which can better form the highest point part 2063.

[0057] The lower plate surface of the first impeller plate 201 is provided with a welding groove 2011 accommodating the upper surfaces of the long blades 206 and the short blades 207. The upper surfaces of the long blades 206 and the short blades 207 are provided with strip-shaped convex ribs 208 facilitating welding melting. The width of the strip-shaped convex ribs 208 is smaller than the width of the long blades 206 and the short blades 207. The welding groove 2011 is provided with a plurality of transverse convex ribs 2013 crossing the welding groove 2011 in the width direction. The transverse convex ribs 2013 are discretely arranged and cooperate with the strip-shaped convex ribs 208. During welding, the strip-shaped convex ribs 208 and the transverse convex ribs 2013 can be better and faster melted and fused into the welding groove 2011, so that the welding is more firm. In order to facilitate the cooperation between the strip-shaped convex ribs 208 and the welding groove 2011, positioning protrusions 209 are arranged on the strip-shaped convex ribs 208. Corresponding positioning insertion holes 2012 are arranged in the welding groove 2011, so that the assembly of the strip-shaped convex ribs 208 and the welding groove 2011 is facilitated.

[0058] The shape of the short blades 207 is the same as the shape of the corresponding length blades of the long blades 206. The centrifugal forces of the water flow passing through the flow channels and received by the long blades 206 and the short blades 207 are the same, so that the water flow is stable, and the mutual interference caused by the different directions of the outlet water flow is avoided.

[0059] In the embodiment, due to the existence of the highest point part 2063, all the long blades 206 and the short blades 207 are arranged on the second impeller plate 202 and integrally formed with the second impeller plate 202. Similarly, the upper plate surface of the first impeller plate 201 is also provided with an annular water stop ring 205. The rotor shaft sleeve 2021 is integrally formed with the second impeller plate 202. The lower part of the rotor shaft sleeve 2021 is provided with a cladding part 20211 cladding the magnetic yoke cylinder 211 and the magnetic ring 210. The second impeller plate 202 and the first impeller plate 201 are combined and welded by a welding process. The transverse convex ribs 2013 and the strip-shaped convex ribs 208 facilitate welding, so that they are faster melted, and the melted thickness fluid fills into the welding groove 2011, so as to ensure the welding quality.

[0060] The upper plate surface of the first impeller plate 201 is also provided with an annular water stop ring 205. The upper cover 300 is provided with an annular groove 303 accommodating the water stop ring 205. The cooperation between the annular groove 303 and the water stop ring 205 can avoid the backflow phenomenon. The liquid flowing from the central water inlet pipe 203 can all flow out from the water outlet 302, so as to avoid the influence of the backflow liquid on the water inlet amount and improve 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 and outlet angles, the pump head is increased while the flow-head curve is smoother. This also avoids the phenomenon of a hump in the flow-head curve caused by the excessively high head of the electronic pump 1.

[0062] The inlet angle is defined as α, and the inlet angle is determined as follows: the intersection point of the extended blade profile of the inner end of the long blade 206 and the profile of the central water inlet 203 is defined as the inner intersection point. The tangent line of the extended blade profile is drawn through the inner intersection point to form the inner profile tangent line. At the same time, the tangent line of the profile of the central water inlet 203 is drawn through the inner intersection point to form the rotation direction line. The inlet angle α is the angle between the inner profile tangent line and the rotation direction line. Preferably, the inlet angle is 27°.

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

[0064] Compared with the prior art, which also uses long blades 206, the impeller 200 in this embodiment of the present invention has an excessively high rejection coefficient, which can cause blockage and flow separation in the inlet flow channel, making it difficult to improve the overall efficiency of the impeller 200. However, in this embodiment, due to the use of long blades 206 and short blades 207, flow separation can be prevented, flow channel blockage can be prevented, and cavitation performance can be improved, thereby improving the efficiency of the impeller 200.

[0065] like Figure 17 As shown in the graph, the relationship between flow rate, efficiency, and head reveals that the original comparative scheme used 8 long blades (206), while the scheme in this embodiment uses 6 long blades (206) and 3 short blades (207), totaling 9 blades. The impeller 200 in the original comparative scheme had a maximum design speed of 6800 rpm, while the impeller 200 in this embodiment has a maximum design speed of 6050 rpm. Figure 17 Relationship diagram in

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

[0067] Example 2

[0068] like Figure 18 andFigure 19 As shown, the brushless electronic water pump 1 in this embodiment has a basically the same structure as that in embodiment 1. The only difference is that the impeller 2 and stator assembly 100 in this embodiment are different from those in embodiment 1. The stator assembly 100 in this embodiment does not have a PCBA board 105, so 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 controller.

[0069] like Figure 20 As shown, the impeller assembly in impeller 2 of this embodiment includes one long blade 206 and one short blade 207, with all long blades 206 and short blades 207 evenly distributed circumferentially at equal intervals. In this embodiment, there are a total of eight long blades 206 and short blades 207. The long blades 206 are all disposed on the second impeller plate 202, and all short blades 207 are disposed on the first impeller plate 201. The long blades 206 and short blades 207 are welded and fixed to the first impeller plate 201 and the second impeller plate 202, respectively. The first impeller plate 201 is provided with a welding groove 2011 to accommodate the long blades 206, and the second impeller plate 202 is provided with a welding groove 2011 to accommodate the short blades 207.

[0070] In this embodiment, the stator assembly 100 includes a stator core 106, stator windings, and a plastic stator inner housing 108. The stator core 106 and stator windings are embedded in the stator inner housing 108. A sealing spacer 109 is provided on the stator inner housing 108, and a central shaft 104 is embedded in the center of the sealing spacer 109. 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. A conductive bracket 500 is fixed at the bottom of the stator inner housing 108, and three stator connecting pieces 501 and one grounding connecting piece are embedded in the conductive bracket 500. 502, the stator connecting piece 501 is welded and fixedly connected to the three-phase connecting piece 116 on the stator winding in a one-to-one correspondence; the lower cover 400 is provided with a connector 401, and the connector 401 is provided with connector pins 503 that are connected to the three stator connecting pieces 501 and one grounding connecting piece 502 in a one-to-one correspondence. In use, the electronic water pump 1 can be controlled by simply plugging the connector 401 into the external controller on the vehicle, which is more suitable for the highly integrated control requirements of current automobiles. In addition, the stator assembly 100 does not have a PCBA board 105 and a heat dissipation metal plate 110, and the overall axial dimension is smaller.

[0071] like Figure 18As shown, the conductive support 500 comprises a support plate made of insulating material, the support plate is provided with positioning holes, the number of positioning holes is two, the outer periphery of the support plate is provided with clamping notches 504, the stator inner shell 108 is provided with clamping protrusions 113, support steps 114 and positioning columns 115, the positioning columns 115 are inserted into the positioning holes, the clamping protrusions 113 are clamped into the clamping notches 504, and each clamping protrusion 113 is provided with the support step 114, so that the support plate surface is clamped and supported at the same time. The grounding connecting piece 502 in the embodiment directly contacts the stator core 106 through a grounding spring 600 arranged in the stator inner shell 108. The fixing of the conductive support 500 is very convenient, the positioning columns 115 and the positioning holes are used for convenient positioning, the support steps 114 and the clamping protrusions 113 can effectively clamp and support, and the three-phase connecting piece 116 and the stator connecting piece 501 are used for good fixing and connection.

[0072] The above-described embodiments are only preferred embodiments of the utility model, and are not used to limit the scope of the utility model. Various modifications and improvements of the technical scheme of the utility model made without departing from the design spirit of the utility model shall fall within the protection scope of the utility model defined by the claims.

Claims

1. A novel brushless electronic water pump, comprising a housing, an upper end of the housing is provided with an upper cover, a lower end of the housing is provided with a lower cover, a stator assembly is installed in the housing, a sealing spacer is arranged in the housing, a rotor assembly installation cavity is arranged in the sealing spacer, a rotor impeller assembly is rotatably installed in the rotor assembly installation cavity, a region between the sealing spacer 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 arranged on the upper cover, characterized in that: The impeller comprises a first impeller plate, a second impeller plate and blades connecting 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 center water inlet pipe opening is arranged at the center of the first impeller plate and communicates with the fluid driving chamber, the center water inlet pipe opening corresponds to a water inlet on the upper cover, the blades divide the fluid driving chamber into a plurality of flow channels, the outer contour between the first impeller plate and the second impeller plate is provided with water outlet windows communicating with each flow channel, the second impeller plate is provided with a rotor shaft sleeve, the rotor shaft sleeve is provided with a rotor magnetic ring assembly matched with a stator assembly, characterized in that the blades comprise a plurality of long blades and short blades, 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 uniformly distributed around the center of the center water inlet pipe opening; when the blade group comprises 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 extend spirally from the center water inlet pipe opening to the outer contour of the water pump impeller, and the short blade in each blade group is between the two long blades in the same group; when the blade group comprises one long blade and one short blade, all the long blades and short blades are alternately and equally spaced around the circumference; the short blade extends spirally from the middle of the long blade to the outer contour of the water pump impeller, the peripheral end between adjacent long blades, the peripheral end between the long blade and the short blade and the first impeller plate and the second impeller plate form the water outlet window. ​ 2. A novel brushless electronic water pump as claimed in claim 1, characterized in that: The long blades are twisted blades, the 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 part, the highest point part extends to the inner wall of the center water inlet pipe opening, the long blades and the short blades are arranged on the upper plate surface of the second impeller plate and are integrally formed with the second impeller plate, and the long blades and the short blades are welded and fixed with the lower plate surface of the first impeller plate. Or 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 with the first impeller plate and the second impeller plate.

3. A novel brushless electronic water pump as claimed in claim 2, characterized in that: The lower plate surface of the first impeller plate is provided with a welding groove accommodating the upper surfaces of the long blades and the short blades, or the first impeller plate is provided with a welding groove accommodating the long blades, and the second impeller plate is provided with a welding groove accommodating the short blades, the upper surfaces of the long blades and the short blades are provided with strip-shaped convex ribs facilitating welding and melting, the width of the strip-shaped 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 crossing the welding groove from the width direction, the transverse convex ribs are discretely arranged and matched with the strip-shaped convex ribs.

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

5. A novel brushless electronic water pump as claimed in claim 4, characterized in that: The upper plate surface of the first impeller plate is further provided with an annular water stop ring, and the upper cover is provided with an annular groove accommodating the water stop ring.

6. A novel 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 brushless electronic water pump as claimed in claim 1 characterized by: The stator assembly comprises a stator core, a stator winding and a plastic stator inner housing, the stator core and the stator winding are embedded in the stator inner housing, the stator inner housing is provided with the sealing sleeve, the center of the sealing sleeve is embedded with a center shaft, the upper end of the stator inner housing is further provided with a lower flange part matched with the upper cover of the water pump, the bottom of the stator inner housing is fixed with a heat dissipation metal plate, the heat dissipation metal plate is provided with a protruding ring protruding upward and a capacitor mounting protrusion protruding upward, the capacitor mounting protrusion forms a capacitor mounting cavity for mounting the capacitor, the bottom of the capacitor mounting cavity is provided with a plug-in opening, the protruding ring is in sealing fit with the stator inner housing, the bottom of the sealing sleeve is provided with a communication hole in communication with the inside of the protruding ring, the bottom of the heat dissipation metal plate is fixed with a PCBA plate, the capacitor on the PCBA plate is plugged into the capacitor mounting cavity from the plug-in opening, and the capacitor and the cavity wall of the capacitor mounting cavity are filled with heat-conducting glue.

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

9. A new brushless electronic water pump as claimed in claim 1 characterized by: The stator assembly comprises a stator core, a stator winding and a plastic stator inner housing, the stator core and the stator winding are embedded in the stator inner housing, the stator inner housing is provided with the sealing sleeve, the center of the sealing sleeve is embedded with a center shaft, the upper end of the stator inner housing is further provided with a lower flange part matched with the upper cover of the water pump, the bottom of the stator inner housing is fixed with a heat dissipation metal plate, the heat dissipation metal plate is provided with a protruding ring protruding upward and a capacitor mounting protrusion protruding upward, the capacitor mounting protrusion forms a capacitor mounting cavity for mounting the capacitor, the bottom of the capacitor mounting cavity is provided with a plug-in opening, the protruding ring is in sealing fit with the stator inner housing, the bottom of the sealing sleeve is provided with a communication hole in communication with the inside of the protruding ring, the bottom of the heat dissipation metal plate is fixed with a PCBA plate, the capacitor on the PCBA plate is plugged into the capacitor mounting cavity from the plug-in opening, and the capacitor and the cavity wall of the capacitor mounting cavity are filled with heat-conducting glue.

10. A novel brushless electronic water pump as claimed in claim 9, characterized in that: The stator inner housing is provided with a plurality of clamping cavities supporting the stator core from the inside, the bottom of the clamping cavity is through and the upper end is blind. The stator assembly comprises a stator core, a stator winding and a plastic stator inner housing, the stator core and the stator winding are embedded in the stator inner housing, the stator inner housing is provided with the sealing sleeve, the center of the sealing sleeve is embedded with a center shaft, the upper end of the stator inner housing is further provided with a lower flange part matched with the upper cover of the water pump, the bottom of the stator inner housing is fixed with a heat dissipation metal plate, the heat dissipation metal plate is provided with a protruding ring protruding upward and a capacitor mounting protrusion protruding upward, the capacitor mounting protrusion forms a capacitor mounting cavity for mounting the capacitor, the bottom of the capacitor mounting cavity is provided with a plug-in opening, the protruding ring is in sealing fit with the stator inner housing, the bottom of the sealing sleeve is provided with a communication hole in communication with the inside of the protruding ring, the bottom of the heat dissipation metal plate is fixed with a PCBA plate, the capacitor on the PCBA plate is plugged into the capacitor mounting cavity from the plug-in opening, and the capacitor and the cavity wall of the capacitor mounting cavity are filled with heat-conducting glue. The stator inner housing is provided with a plurality of clamping cavities supporting the stator core from the inside, the bottom of the clamping cavity is through and the upper end is blind. The stator assembly comprises a stator core, a stator winding and a plastic stator inner housing, the stator core and the stator winding are embedded in the stator inner housing, the stator inner housing is provided with the sealing sleeve, the center of the sealing sleeve is embedded with a center shaft, the upper end of the stator inner housing is further provided with a lower flange part matched with the upper cover of the water pump, the bottom of the stator inner housing is fixed with a heat dissipation metal plate, the heat dissipation metal plate is provided with a protruding ring protruding upward and a capacitor mounting protrusion protruding upward, the capacitor mounting protrusion forms a capacitor mounting cavity for mounting the capacitor, the bottom of the capacitor mounting cavity is provided with a plug-in opening, the protruding ring is in sealing fit with the stator inner housing, the bottom of the sealing sleeve is provided with a communication hole in communication with the inside of the protruding ring, the bottom of the heat dissipation metal plate is fixed with a PCBA plate, the capacitor on the PCBA plate is plugged into the capacitor mounting cavity from the plug-in opening, and the capacitor and the cavity wall of the capacitor mounting cavity are filled with heat-conducting glue.

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