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 utility model relates to water pump technical field especially relates to a water pump impeller. BACKGROUND

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

[0003] The applicant applied for a utility model patent for a rotor assembly and its mounting structure of a high-power brushless electronic water pump on November 2, 2020, and the patent was granted with the authorization announcement number CN 213870317 U. The rotor assembly discloses an impeller structure, wherein 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 assembly, the upper impeller half is provided with blades, and the lower impeller half is provided with grooves matched with the shapes of the blades. The entire blades have the same length and are uniformly distributed in the circumference. The automobile electronic water pump is a core component in the automobile cooling system, and its function is to dissipate the high heat generated by the frequent operation of the automobile engine under heavy load conditions and the air conditioning system of the entire vehicle, achieve cooling effect through heat exchange, prevent the engine from overheating, and ensure the smooth operation of the engine. 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 for easy rotation of the rotor. 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, resulting in low efficiency of the impeller. UTILITY MODEL CONTENTS

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

[0007] The utility model discloses a water pump impeller, including first impeller board, second impeller board and the blade between connecting first impeller board and second impeller board, the fluid chamber is formed between first impeller board and second impeller board, the center of first impeller board is provided with the center water inlet pipe mouth with fluid chamber intercommunication, the blade divides the fluid chamber into several flow channels, the outer contour between first impeller board and second impeller board is provided with the water outlet with each flow channel intercommunication, the blade includes several pieces long blade and short blade, and every two pieces 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, and the long blade in each blade group is spaced apart, and the long blade in each blade group extends to the outer contour of water pump impeller from center water inlet pipe mouth, and the short blade in each blade group is between the long blade of same group, and the short blade extends 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 first impeller board and second impeller board form the water outlet.

[0008] As a preferred scheme, the long blade is a twisted blade, and an inner side of the long blade is provided with an inner side slope, the inner side slope and a twisted upper surface of the long blade intersect to form a highest point part, and the highest point part extends to an inner wall of the center water inlet pipe mouth.

[0009] As a preferred scheme, the long blade and the short blade are arranged on an 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 a lower plate surface of the first impeller board.

[0010] As a preferred scheme, a welding groove accommodating upper surfaces of the long blade and the short blade is arranged on the lower plate surface of the first impeller board, and the upper surface of the long blade and the short blade is provided with a strip-shaped reinforcing rib facilitating welding and melting, and a width of the strip-shaped reinforcing rib is less than a width of the long blade and the short blade.

[0011] As a preferred scheme, a plurality of transverse reinforcing ribs crossing the welding groove in a width direction are arranged on the welding groove, and the transverse reinforcing ribs are discretely arranged and cooperate with the strip-shaped reinforcing rib.

[0012] As a preferred scheme, a positioning hole is arranged in the welding groove, and a positioning column corresponding to the strip-shaped reinforcing rib is arranged in the positioning hole.

[0013] As a preferred scheme, the number of the long blades is six, and the number of the short blades is three, and the shape of the short blade is the same as that of a corresponding length section of the long blade.

[0014] As a preferred scheme, an annular water-stopping ring is arranged on the upper plate surface of the first impeller plate.

[0015] 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°.

[0016] After the above technical scheme is adopted, the effect of the utility model is that: since the blades include a plurality of long blades and short blades, each two long blades and one short blade form a blade group, each blade group is evenly distributed along the center circle of the center inlet pipe, the two long blades in each blade group are arranged at intervals, the long blades in each blade group extend spirally from the center inlet pipe 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 extend spirally from the middle of the long blades to the outer contour of the water pump impeller, the peripheral end between adjacent long blades, the peripheral end between the long blades and the short blades, and the first impeller plate and the second impeller plate form the water outlet, therefore, the blades near the center inlet pipe are actually long blades, the spacing between the inner end of the long blades is relatively sparse, so that the water flow has a larger space when entering from the center inlet pipe, and when the water flow enters the short blades, the flow rate and pressure of the water flow can be increased due to the existence of the short blades, so that the water flow rate and water pressure are guaranteed, and the water flow entering amount is further improved, thereby improving the efficiency of the water pump.

[0017] In addition, the long blades are twisted blades, the inner side of the long blades is provided with an inner side slope, the inner side slope and the twisted upper surface of the long blades intersect to form a highest point part, and the highest point part extends to the inner wall of the center inlet pipe, so that the highest point of the long blades is closer to the center inlet pipe, thereby generating a centrifugal effect when the water flow just enters, thereby improving the flow rate and increasing the lift.

[0018] In addition, 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, the long blades and the short blades are welded and fixed with the lower plate surface of the first impeller plate, 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, the upper surfaces of the long blades and the short blades are provided with strip-shaped ribs facilitating welding and melting, and the width of the strip-shaped 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, the formation of the highest point part is facilitated, and welding and fixing with the first impeller plate are facilitated, and since the strip-shaped ribs are arranged on the upper surfaces of the long blades and the short blades, the strip-shaped ribs can be better melted and fused into the welding groove during welding, and the welding is more firm.

[0019] And since the welding groove is provided with a plurality of transverse ribs crossing the welding groove in the width direction, the transverse ribs are arranged discretely and cooperate with the strip-shaped ribs, so that the strip-shaped ribs and the transverse ribs can be melted faster during welding, so that the welding and fixing can be better.

[0020] And since the number of long blades is six and the number of short blades is three, the short blades have the same shape as the corresponding length section of the long blades, so that the short blades and the corresponding length section of the long blades have the same shape, and the water flow passing through the flow passage is subjected to the same centrifugal force of the long blades and the short blades, so that the water flow is stable.

[0021] And since the first impeller plate is further provided with an annular water stop ring on the upper plate surface, the upper cover of the rotor assembly of the water pump can be provided with an annular groove matched with the water stop ring, so that the backflow phenomenon can be avoided, and the efficiency of the water pump is further improved.

[0022] And since the inlet angle of the long blades is 25-28° and the outlet angle of the long blades is 21-23°, the inlet angle and the outlet angle are optimized, so that the head of the water pump is higher and the flow head curve is smoother, and the phenomenon that the flow head curve appears hump due to the too high head of the electronic water pump is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be further explained in connection with the drawings and examples.

[0024] Figure 1 is the structure perspective drawing of the utility model embodiment;

[0025] Figure 2 is the top view of the utility model embodiment;

[0026] Figure 3 is Figure 2 the sectional view at A-A;

[0027] Figure 4 is the perspective drawing of the first impeller plate;

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

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

[0030] Figure 7 is the head and efficiency comparison diagram of the impeller in the utility model embodiment and the background art;

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

[0032] The utility model will be described in further detail below through specific embodiments.

[0033] As Figures 1 to 6 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 the embodiment is an electronic water pump used on a car, and the water pump impeller 100 is made of plastic as a whole.

[0034] The first impeller plate 1 and the second impeller plate 2 form a fluid chamber therebetween, the first impeller plate 1 is provided with a central water inlet 3 communicating with the fluid chamber, the blades divide the fluid chamber into a plurality of flow channels, and the outer contour between the first impeller plate 1 and the second impeller plate 2 is provided with a water outlet 4 communicating with each flow channel.

[0035] In the embodiment, up and down are determined according to the placement state of the water pump impeller 100 in Figure 3 , wherein the first impeller plate 1 is above the second impeller plate 2, and in the embodiment, inner refers to the side close to the center of the water pump impeller 100 as the inner side, and the side far from the center as the outer side.

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

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

[0038] The spacing between the peripheral end of the short blades 7 in each group of blade groups and the peripheral end of the adjacent long blades 6 is equal, and the short blades 7 divide the channel between the adjacent long blades 6 into two equal flow channels.

[0039] The long blades 6 are twisted blades, and the inner side of the long blades 6 is provided with an inner side slope 62, which intersects with the twisted upper surface 61 of the long blades 6 to form a highest point part 63, and the highest point part 63 extends to the inner wall of the central water inlet port 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 with the lower plate surface of the first impeller plate 1. Due to the existence of the highest point part 63, the long blades 6 and the short blades 7 are arranged on the second impeller plate 2, which can better facilitate injection molding and demolding.

[0041] The lower plate surface of the first impeller plate 1 is provided with a welding groove 11 accommodating the upper surfaces 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 segment on the inner wall of the central water inlet port 3 for cooperation with the highest point part 63, and the upper surfaces of the long blades 6 and the short blades 7 are provided with strip-shaped ribs 8 for facilitating welding and melting, and the width of the strip-shaped ribs 8 is less than the width of the long blades 6 and the short blades 7. The length of the strip-shaped ribs 8 is also less than the length of the corresponding long blades 6 and short blades 7.

[0042] The welding groove 11 is provided with a plurality of transverse ribs 13 crossing the welding groove 11 from the width direction, and the transverse ribs 13 are discretely arranged and cooperate with the strip-shaped ribs 8. The welding groove 11 is provided with a positioning hole 12, and the corresponding strip-shaped rib 8 is provided with a positioning column 9 matched with the positioning hole 12.

[0043] First, the first impeller plate 1 and the second impeller plate 2 are molded respectively, and the long blades 6 and the short blades 7 are integrally molded with the second impeller plate 2, and then the positioning column 9 on the long blades 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, and the long blades 6 and the short blades 7 are matched with the corresponding welding groove 11, and when welding, the strip-shaped ribs 8 and the transverse ribs 13 are in contact and melt, and the melted plastic fills the welding groove 11, thereby firmly welding the long blades 6, the short blades 7 and the welding groove 11.

[0044] As Figure 1As shown, an annular water-stop ring 5 is also provided on the upper 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 pump rotor assembly. After assembly, the water-stop ring 5 is located in the annular groove. In this way, without hindering the rotation of the impeller 100, the liquid is difficult to flow through the gap between the first impeller plate 1 and the upper cover, thereby avoiding liquid backflow. In this way, the liquid flowing in from the central water inlet 3 will all flow out from the water outlet 4, avoiding liquid backflow from affecting the water inflow and improving the efficiency of the 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, which is determined as follows: the intersection point of the extended blade profile of the inner end of the long blade 6 and the profile of the central water inlet 3 is defined as the inner intersection point. A tangent line to the extended blade profile is drawn through this inner intersection point to form the inner profile tangent line. At the same time, a tangent line to the profile of the central water inlet 3 is drawn through this 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°.

[0047] The exit angle is defined as β, which is determined as follows: the tangent of the outer contour line of the outer end of the long blade 6 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.

[0048] Compared with the prior art, which also uses long blades 6, the impeller 100 in this embodiment of the present invention has an excessively high rejection coefficient, which can cause blockage and flow separation in the inlet channel, making it difficult to improve the overall efficiency of the impeller 100. However, in this embodiment, due to the use of long blades 6 and short blades 7, flow separation can be prevented, flow channel blockage can be prevented, and cavitation performance can be improved, thereby improving the efficiency of the impeller 100.

[0049] like Figure 7 As shown in the graph, the relationship between flow rate, efficiency, and head reveals that the original comparative scheme used 8 long blades (6), while the scheme in this embodiment uses 6 long blades (6) and 3 short blades (7). The maximum design speed of the impeller 100 in the original comparative scheme was 6800 rpm, while the maximum design speed of the impeller 100 in this embodiment is 6050 rpm. Figure 7 Relationship diagram in

[0050] In the figure, it can be found that the rotational speed of the impeller 100 in the embodiment is reduced by 750 rpm, and the head is still increased by nearly 3 m under the rated flow of 1440 L / h, and at the same time, the efficiency under the rated flow is higher than that of the original comparison scheme.

[0051] The above-described embodiments are only descriptions of preferred embodiments of the present application and do not limit the scope of the present application. Various modifications and improvements of the technical scheme of the present application made without departing from the design spirit of the present application shall fall within the protection scope of the present application defined by the claims.

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 being formed between the first impeller plate and the second impeller plate, a center inlet being provided in the center of the first impeller plate and communicating with the fluid chamber, the blades separating the fluid chamber into a plurality of flow passages, and an outer contour between the first impeller plate and the second impeller plate being provided with a water outlet communicating with each flow passage, characterized in that: The blades include several long blades and short blades, each two long blades and one short blade form a blade group, each blade group is uniformly distributed around the center of the center inlet pipe, the two long blades in each blade group are arranged at intervals, the long blades in each blade group extend spirally from the center inlet pipe 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 extend spirally from the middle of the long blades to the outer contour of the water pump impeller, the peripheral end between adjacent long blades, the peripheral end between long blades and short blades, and 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 blades are twisted blades, the inner side of the long blades is provided with an inner side slope, the inner side slope and the twisted upper surface of the long blades intersect to form a highest point part, and the highest point part extends to the inner wall of the center inlet pipe.

3. A water pump impeller as claimed in claim 1, characterized in that: 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.

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 a welding groove accommodating the upper surfaces of the long blades and the short blades, and the upper surfaces of the long blades and the short blades are provided with strip-shaped ribs facilitating welding melting, and the width of the strip-shaped ribs is less than the width of the long blades and the short blades.

5. A water pump impeller as claimed in claim 4, wherein: The welding groove is provided with several transverse ribs crossing the welding groove in the width direction, and the transverse ribs are arranged discretely and cooperate with the strip-shaped ribs.

6. A water pump impeller as claimed in claim 5, characterized in that: The welding groove is provided with a positioning hole, and the corresponding strip-shaped rib is provided with a positioning column matched with the positioning hole.

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

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

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

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