Water pump impeller

Abstract

The water pump impeller comprises a first impeller plate, a second impeller plate and blades connected between the first impeller plate and the second impeller plate, a center water inlet pipe opening is formed in the center of the first impeller plate, and a water outlet is formed in the outer contour between the first impeller plate and the second impeller plate. The blades comprise a plurality of long blades and short blades, every two long blades and one short blade form a blade group, the blade groups are circumferentially and uniformly distributed around the center of the central water inlet pipe orifice, the two long blades in each blade group are arranged at intervals, and the long blades in each blade group spirally extend to the outer contour of the water pump impeller from the central water inlet pipe orifice. The short blades in each blade set are located between the two long blades in the same set, the short blades spirally extend to the outer contour of the water pump impeller from the middles of the long blades, and the water outlets are formed at the peripheral ends between the adjacent long blades, the peripheral ends between the long blades and the short blades and between the first impeller plate and the second impeller plate.

Description

Technical Field

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

[0002] In the water pump impeller, flow rate and head are important factors. Most of the current water pump impellers are flat plate structures twisted into spiral structures.

[0003] The applicant applied for an invention patent for a rotor assembly and mounting structure of a high-power brushless electronic water pump on November 2, 2020. The authorization announcement number is CN 213870317 U. The rotor assembly discloses an impeller structure, wherein 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 fit, 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. As a core component in the automotive cooling system, the automotive electronic water pump is used to cool the high heat generated by the operation of the automobile engine under high load conditions and the frequent operation of systems such as the vehicle air conditioner, and to achieve a cooling effect through heat exchange to prevent the engine from overheating, so as to ensure that the engine can run smoothly. However, the impeller of the rotor assembly still has some technical defects:

[0004] 1. Due to the size limitation of the rotor assembly, it is difficult to improve the efficiency of the rotor;

[0005] 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. When this gap is too wide, part of the liquid that originally flowed out of the impeller outlet will flow back to the central water inlet through the gap, resulting in relatively low efficiency of the impeller. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a water pump impeller with higher efficiency.

[0007] In order to solve the above technical problems, the technical solution of the present invention is: a water pump impeller, comprising a first impeller plate, a second impeller plate and blades connecting the first impeller plate and the second impeller plate, a fluid chamber is formed between the first impeller plate and the second impeller plate, a central water inlet pipe port communicating with the fluid chamber is arranged at the center of the first impeller plate, the blades divide the fluid 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 communicating with each flow channel, the blades include a plurality of long blades and short blades The invention relates to a blade group, wherein every two long blades 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, and the two long blades in each blade group are arranged at intervals, and the long blades in each blade group spirally extend 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 located between the two long blades in the same group, and 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.

[0008] As a preferred solution, the long blade is a twisted blade, and an inner slope is provided on the inner side of the long blade. The inner slope and the twisted upper surface of the long blade intersect to form a highest point, and the highest point extends to the inner wall of the central water inlet pipe.

[0009] As a preferred solution, the long blades and the short blades are both 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 to the lower plate surface of the first impeller plate.

[0010] 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, and the upper surfaces of the long blades and 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.

[0011] As a preferred solution, the welding groove is provided with a plurality of transverse ribs spanning the welding groove in the width direction, and the transverse ribs are discretely arranged and cooperate with the strip ribs.

[0012] As a preferred solution, a positioning hole is provided in the welding groove, and a positioning column which is positioned and matched with the positioning hole is provided on the corresponding strip convex rib.

[0013] As a preferred solution, the number of the long blades is six, the number of the short blades is three, and the shape of the short blades is the same as the shape of the blades of the corresponding length segments in the long blades.

[0014] As a preferred solution, an annular water stop ring is also provided on the upper plate surface of the first impeller plate.

[0015] 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°.

[0016] After adopting the above technical scheme, the effect of the present invention is as follows: since the blades include a plurality of long blades and short blades, every two long blades and one short blade form a blade group, each blade group is evenly distributed around the central circumference of the central water inlet pipe port, 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 port to the outer contour of the water pump impeller, the short blades in each blade group are between the two long blades in the same group, the short blades spirally extend from the middle of the long blades to the outer contour of the water pump impeller, the outer peripheral ends between adjacent long blades, the outer peripheral ends between the long blades and the short blades, and the first impeller plate and The water outlet is formed between the second impeller plates. Therefore, the blades near the central water inlet pipe are actually long blades. 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. When the water flows into the short blades, the presence of the short blades can increase the flow rate and pressure of the water outflow, thereby ensuring sufficient water outlet flow rate and water outlet pressure. Therefore, 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.

[0017] Furthermore, since the long blade is a twisted blade, an inner inclined surface is provided on the inner side of the long blade, and the inner inclined surface and the twisted upper surface of the long blade intersect to form a highest point, and the highest point extends to the inner wall of the central water inlet pipe opening. Therefore, the highest point of the long blade is closer to the central water inlet pipe opening, so that a centrifugal effect is generated when the water just enters, thereby increasing the flow rate and the head.

[0018] Since the long blades and the short blades are both arranged on the upper plate surface of the second impeller plate and are integrally formed with the second impeller plate, the long blades and the short blades are welded and fixed to the lower plate surface of the first impeller plate, and a welding groove for accommodating the upper surfaces of the long blades and the short blades is provided on the lower plate surface of the first impeller plate. The upper surfaces of the long blades and the short blades are provided with strip convex ribs for convenient welding and melting. The width of the strip convex ribs is smaller than the width of the long blades and the short blades. Since the long blades are directly formed with the second impeller plate, this facilitates the forming of the highest point and is also convenient for welding and fixing with the first impeller plate. At the same time, since the strip convex ribs are provided on the upper surfaces of the long blades and the short blades, the strip convex ribs can be better melted and integrated into the welding groove during welding, and the welding is more firm.

[0019] Furthermore, since the welding groove is provided with a plurality of transverse ribs spanning the welding groove in the width direction, the transverse ribs are discretely arranged and cooperate with the strip ribs, the strip ribs and the transverse ribs will melt faster during welding, so that they can be better welded and fixed.

[0020] Furthermore, since the number of the long blades is six and the number of the short blades is three, the shape of the short blades is the same as the shape of the blades of the corresponding length segments in the long blades. Thus, the shapes of the blades of the corresponding length segments of the short blades and the long blades are the same, and the centrifugal forces exerted on the long blades and the short blades when the water flows through the circulation channel are the same, thus ensuring the stability of the water flow.

[0021] Since an annular water stop ring is also provided on the upper plate surface of the first impeller plate, an annular groove adapted to the water stop ring can be provided on the upper cover of the rotor assembly of the water pump, thereby avoiding backflow and further improving the efficiency of the water pump.

[0022] Since the inlet angle of the long blade is 25-28° and the outlet angle of the long blade is 21-23°, the head of the water pump is higher and the flow head curve is smoother by optimizing the inlet angle and the outlet angle; it also avoids the phenomenon that the flow head curve has a hump due to the excessive head of the electronic water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 is a structural stereogram of an embodiment of the present invention;

[0025] Figure 2 is a top view of an embodiment of the present invention;

[0026] Figure 3 yes Figure 2 Sectional view at AA;

[0027] Figure 4 is a three-dimensional view of the first impeller plate;

[0028] Figure 5 is a front perspective view of the second impeller plate;

[0029] Figure 6 is a front plan view of the second impeller plate;

[0030] Figure 7 is a comparison diagram of the lift and efficiency of the impeller in the embodiment of the present invention and the background technology;

[0031] In the attached drawings: 100, impeller; 1, first impeller plate; 11, welding groove; 12, positioning hole; 13, transverse rib; 2, second impeller plate; 3, central water inlet; 4, water outlet; 5, water stop ring; 6, long blades; 61, twisted upper surface; 62, inner inclined surface; 63, highest point; 7, short blades; 8, strip ribs; 9, positioning column. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below through specific examples.

[0033] like Figures 1 to 6 As shown, a water pump impeller 100 includes a first impeller plate 1, a second impeller plate 2 and blades connecting the first impeller plate 1 and the second impeller plate 2, wherein the water pump impeller 100 in this embodiment is an electronic water pump used in a car, and the water pump impeller 100 is made of plastic material as a whole.

[0034] A fluid chamber is formed between the first impeller plate 1 and the second impeller plate 2. A central water inlet pipe 3 connected to the fluid chamber is arranged at the center of the first impeller plate 1. The blades divide the fluid chamber into a plurality of flow channels. The outer contour between the first impeller plate 1 and the second impeller plate 2 is provided with a water outlet 4 connected to each flow channel.

[0035] The upper and lower parts mentioned in this embodiment are based on the water pump impeller 100 according to Figure 3 The arrangement state is determined in the embodiment, wherein the first impeller plate 1 is above the second impeller plate 2, and the inner mentioned in this embodiment means that the side close to the center of the water pump impeller 100 is the inner side, and the side away from the center is the outer side.

[0036] like Figure 5 and Figure 6 As shown, the blades include a plurality of long blades 6 and short blades 7, and every two long blades 6 and one short blade 7 form a blade group, and each blade group is evenly distributed around the central circumference of the central water inlet pipe port 3. The two long blades 6 in each blade group are arranged at intervals, and the long blades 6 in each blade group spirally extend from the central water inlet pipe port 3 to the outer contour of the water pump impeller 100. The short blades 7 in each blade group are located between the two long blades 6 in the same group, and the short blades 7 spirally extend from the middle of the long blades 6 to the outer contour of the water pump impeller 100. The outer peripheral ends between adjacent long blades 6, the outer peripheral ends between the long blades 6 and the short blades 7, and between the first impeller plate 1 and the second impeller plate 2 form the water outlet 4.

[0037] Preferably, the number of the long blades 6 is six, the number of the short blades 7 is three, and the shape of the short blades 7 is the same as the shape of the blades of the corresponding length segment in the long blades 6 .

[0038] The distances between the outer ends of the short blades 7 in each blade group and the outer ends of the adjacent long blades 6 are equal, and the short blades 7 divide the passages between the adjacent long blades 6 into two equal flow passages.

[0039] Among them, the long blade 6 is a twisted blade, and an inner inclined surface 62 is arranged on the inner side of the long blade 6. The inner inclined surface 62 and the twisted upper surface 61 of the long blade 6 intersect to form a highest point 63, and the highest point 63 extends to the inner wall of the central water inlet pipe 3.

[0040] The long blades 6 and the short blades 7 are both arranged on the upper plate surface of the second impeller plate 2 and are integrally formed with the second impeller plate 2, and the long blades 6 and the short blades 7 are welded and fixed to the lower plate surface of the first impeller plate 1. Due to the existence of the highest point 63, the long blades 6 and the short blades 7 are both arranged on the second impeller plate 2, which can better facilitate injection molding and demoulding.

[0041] The lower plate surface of the first impeller plate 1 is provided with a welding groove 11 for accommodating the upper surface of the long blades 6 and the short blades 7, wherein the welding groove 11 on the first impeller plate 1 also includes a groove section located on the inner wall of the central water inlet pipe 3 for convenient cooperation with the highest point 63, and the upper surface of the long blades 6 and the short blades 7 is provided with a strip convex rib 8 for convenient welding and melting, and the width of the strip convex rib 8 is smaller than the width of the long blades 6 and the short blades 7. The length of the strip convex rib 8 is also smaller than the length of the corresponding long blades 6 and the short blades 7.

[0042] The welding groove 11 is provided with a plurality of transverse ribs 13 that cross the welding groove 11 in the width direction, and the transverse ribs 13 are discretely arranged and cooperate with the strip ribs 8. A positioning hole 12 is provided in the welding groove 11, and a positioning column 9 that cooperates with the positioning hole 12 is provided on the corresponding strip rib 8.

[0043] First, the first impeller plate 1 and the second impeller plate 2 are formed separately, and the long blades 6 and the short blades 7 are integrally formed with the second impeller plate 2. Then, the positioning column 9 on the long blade 6 is inserted into the positioning hole 12 on the first impeller plate 1. At this time, the positioning of the first impeller plate 1 and the second impeller plate 2 is completed. At this time, the long blades 6 and the short blades 7 correspond to the corresponding welding grooves 11. During welding, the strip ribs 8 and the transverse ribs 13 contact and melt with each other, and the molten plastic will fill the welding grooves 11, thereby firmly welding the long blades 6, the short blades 7 and the welding grooves 11.

[0044] like Figure 1As shown, an annular water stop ring 5 is also provided on the upper plate surface of the first impeller plate 1. Correspondingly, an annular groove adapted to the water stop ring 5 is provided on the upper cover of the rotor assembly of the water pump. After assembly, the water stop ring 5 is in the annular groove, so that it is difficult for liquid to flow through the gap between the first impeller plate 1 and the upper cover without hindering the rotation of the impeller 100, thereby avoiding liquid reflux. In this way, the liquid flowing in from the central water inlet pipe port 3 will all flow out from the water outlet 4, avoiding liquid reflux from affecting the water inlet amount and improving the efficiency of the water pump.

[0045] The inlet angle of the long blade 6 is 25-28°, and the outlet angle of the long blade 6 is 21-23°.

[0046] like Figure 6 As shown, 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 6 intersects with the contour of the central water inlet pipe port 3 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 the inner contour tangent line, and at the same time, the tangent line of the contour of the central water inlet pipe port 3 is made through the inner intersection point to form the rotation direction line. The inlet angle α is the angle between the inner contour tangent line and the rotation direction line, and the preferred inlet angle is 27°.

[0047] 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 6 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.

[0048] The water pump impeller 100 in the embodiment of the present invention is compared with the technical solution of the background technology with the same long blades 6. 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 100. In the present embodiment, due to the arrangement of long blades 6 and short blades 7, it is possible to prevent flow separation and blockage of the flow channel while improving cavitation performance, thereby improving the efficiency of the impeller 100.

[0049] like Figure 7 As shown, from the relationship diagram of flow rate, efficiency and head in the figure, it can be found that the original comparison scheme adopts a scheme with 8 long blades 6, while the scheme in this embodiment adopts a scheme with 6 long blades 6 and 3 short blades 7. The maximum design speed of the impeller 100 in the original comparison scheme is 6800rpm, and the maximum design speed of the impeller 100 in this embodiment is 6050rpm. Figure 7 Relationship diagram in

[0050] It can be found in the figure that under the standard flow rate of 1440L / h, the speed of the impeller 100 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.

[0051] 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 water pump impeller, comprising a first impeller plate, a second impeller plate and blades connecting the first impeller plate and the second impeller plate, a fluid chamber is formed between the first impeller plate and the second impeller plate, a central water inlet port communicating with the fluid chamber is arranged at the center of the first impeller plate, the blades divide the fluid 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 communicating with each flow channel, characterized in that: The blades include a plurality of long blades and short blades, and every two long blades and one short blade form a blade group. The blade groups are evenly distributed around the central circumference of the central water inlet pipe port. 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 port to the outer contour of the water pump impeller. The short blades in each blade group are located between the two long blades in the same group. The short blades spirally extend from the middle of the long blades to the outer contour of the water pump impeller. 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.

2. A water pump impeller as claimed in claim 1, characterized in that: The long blade is a twisted blade, and an inner inclined surface is arranged on the inner side of the long blade. The inner inclined surface and the twisted upper surface of the long blade intersect to form a highest point, and the highest point extends to the inner wall of the central water inlet pipe opening.

3. A water pump impeller as claimed in claim 1, characterized in that: The long blades and the short blades are both arranged on the upper plate surface of the second impeller plate and are integrally formed with the second impeller plate. The long blades and the short blades are fixed to the lower plate surface of the first impeller plate by welding.

4. A water pump impeller as claimed in claim 3, characterized in that: The lower plate surface of the first impeller plate is provided with welding grooves for accommodating the upper surfaces of long blades and short blades, and the upper surfaces of the long blades and short blades are provided with strip convex ribs for facilitating welding and melting, and the width of the strip convex ribs is smaller than that of the long blades and short blades.

5. A water pump impeller as claimed in claim 4, characterized in that: The welding groove is provided with a plurality of transverse convex ribs which cross the welding groove in the width direction. The transverse convex ribs are discretely arranged and matched with the strip convex ribs.

6. A water pump impeller as claimed in claim 5, characterized in that: A positioning hole is arranged in the welding groove, and a positioning column which is positioned and matched with the positioning hole is arranged on the corresponding strip convex rib.

7. A water pump impeller as claimed in claim 1, characterized in that: The number of the long blades is six, the number of the short blades is three, and the shape of the short blades is the same as the shape of the blades of the corresponding length segments in the long blades.

8. A water pump impeller as claimed in claim 7, characterized in that: An annular water stop ring is also provided on the upper plate surface of the first impeller plate.

9. A water pump impeller as claimed in claim 1, characterized in that: The inlet angle of the long blade is 25-28°, and the outlet angle of the long blade is 21-23°.

Images