A water pump impeller

Abstract

The utility model discloses a water pump impeller, including upper cover, lower cover and long blade, the center of upper cover is provided with center water inlet, and the outer contour between upper cover and lower cover is provided with water outlet, and long blade is three -dimensional space twist long blade, and the inboard end of long blade includes the first upper inner end part of the contact with upper cover, and the first lower inner end part of the contact with lower cover, and the inboard end of long blade gradually twists from the first lower inner end part to the first upper inner end part, and the blade import angle at first upper inner end part is less than the blade import angle at first lower inner end part, the outboard end of long blade includes the first upper outer end part of the connection with upper cover, and the first lower outer end part of the connection with lower cover, and the outboard end of long blade gradually twists from the first lower outer end part to the first upper outer end part, and the blade export angle at first upper outer end part is less than the blade export angle at first lower outer end part. The water pump blade has promoted the hydraulic efficiency and has restrained the blade frequency noise at the same time.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, and in particular to a water pump impeller. Background Technology

[0002] Traditional water pump impellers often use straight blades or simple curved blades. When the fluid interferes with the impeller outlet and the volute casing tongue, strong pressure pulsations are generated, causing blade frequency noise and affecting environmental quietness. To achieve manufacturing convenience, impellers often sacrifice flow channel design. A utility model patent with authorization announcement number CN221170098U discloses a high-velocity water pump impeller. This impeller's blades include an assembly plate with multiple blades fixed on it. Each blade has a working surface and a non-working surface. The surface between the working and non-working surfaces is the front surface, which includes an inner first inclined surface and an outer second inclined surface. The connection between the first and second inclined surfaces is the highest point of the blade. The second inclined surface is a twisted surface. However, when viewed in the orthographic projection of the assembly plate, the blade still appears as a curved blade, only the second inclined surface is twisted. This curved blade design results in significant inlet impact loss, causing high water flow impact noise and easily inducing cavitation. Simultaneously, fluid flow at the curved blade is also prone to flow separation and secondary flow. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a water pump impeller whose blades suppress blade frequency noise while ensuring hydraulic efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a water pump impeller, including an upper cover plate, a lower cover plate, and long blades connecting the upper cover plate and the lower cover plate. A fluid flow chamber is formed between the upper cover plate and the lower cover plate. A central water inlet communicating with the fluid flow chamber is provided at the center of the upper cover plate. The long blades divide the fluid flow chamber into several gradually expanding flow channels. An outlet communicating with each flow channel is provided on the outer contour between the upper cover plate and the lower cover plate. The long blades are three-dimensional spatially twisted long blades. The inner end of the long blades... The part includes a first upper inner end that contacts the upper cover plate and a first lower inner end that contacts the lower cover plate. The inner end of the long blade gradually twists outward from the first lower inner end to the first upper inner end. The blade inlet angle at the first upper inner end is smaller than the blade inlet angle at the first lower inner end. The outer end of the long blade includes a first upper outer end that is connected to the upper cover plate and a first lower outer end that is connected to the lower cover plate. The outer end of the long blade gradually twists outward from the first lower outer end to the first upper outer end. The blade outlet angle at the first upper outer end is smaller than the blade outlet angle at the first lower outer end.

[0005] As a preferred embodiment, the blade inlet angle at the first upper inner end and the blade inlet angle at the first lower inner end are in the range of 10°-40°, the blade outlet angle at the first upper outer end and the blade outlet angle at the first lower outer end are in the range of 25°-75°, and the long blade wrap angle is 40°-120°.

[0006] As a preferred embodiment, the angle difference between the blade inlet angle at the first upper inner end and the blade inlet angle at the first lower inner end is in the range of (0°-15°), and the angle difference between the blade outlet angle at the first upper outer end and the blade outlet angle at the first lower outer end is in the range of (0°-15°).

[0007] As a preferred embodiment, the first upper inner end portion extends to the inner wall of the central water inlet of the upper cover plate.

[0008] As a preferred embodiment, the pump impeller also includes short blades, each short blade forming a blade group with at least one long blade. Each blade group is evenly distributed around the central circumference of the central inlet pipe. The long blades and short blades in each blade group are spaced apart from each other. The inner end of the short blade corresponds to the middle of the long blade, and the outer end of the short blade extends to the outer contour of the upper cover plate and the lower cover plate.

[0009] As a preferred embodiment, the short blade is a twisted blade. The inner end of the short blade includes a second upper inner end that contacts the upper cover plate and a second lower inner end that contacts the lower cover plate. The inner end of the short blade gradually twists outward from the second lower inner end to the second upper inner end. The blade inlet angle at the second upper inner end is smaller than the blade inlet angle at the second lower inner end. The outer end of the short blade includes a second upper outer end that connects to the upper cover plate and a second lower outer end that connects to the lower cover plate. The outer end of the short blade gradually twists from the second lower outer end to the second upper outer end. The blade outlet angle at the second upper outer end is smaller than or equal to the blade outlet angle at the first lower outer end.

[0010] As a preferred embodiment, the angle difference between the blade inlet angle at the second upper inner end and the blade inlet angle at the second lower inner end is in the range of (0°-30°), and the angle difference between the blade outlet angle at the second upper outer end and the blade outlet angle at the second lower outer end is in the range of [0°-15°].

[0011] After adopting the above technical solution, the effect of this utility model is as follows: Since the long blade is a three-dimensional spatially twisted long blade, the inner end of the long blade includes a first upper inner end contacting the upper cover plate and a first lower inner end contacting the lower cover plate. The inner end of the long blade gradually twists outward from the first lower inner end to the first upper inner end, and the blade inlet angle at the first upper inner end is smaller than the blade inlet angle at the first lower inner end. The outer end of the long blade includes a first upper outer end connected to the upper cover plate and a first lower outer end connected to the lower cover plate. The outer end of the long blade gradually twists from the first lower outer end to the first upper outer end, and the blade outlet angle at the first upper outer end is smaller than the blade outlet angle at the first lower outer end. Therefore, the long blade twists outward at the inlet. This design allows for a more uniform radial distribution of fluid pressure, resulting in a larger inlet flow rate. It also reduces inlet backflow and minimizes surge noise caused by head fluctuations. The blade angle at the inlet changes with the fluid flow angle of the medium, reducing inlet impact losses and minimizing cavitation. Furthermore, the long blades are twisted at the outlet. This twisting of the blades throughout the flow channel creates a three-dimensional spatial variation in both radial and circumferential directions, making the blade angle more closely match the fluid flow trajectory. This reduces fluid separation and secondary flow on the blade surface, preventing the formation of local eddies and thus reducing pressure pulsations and broadband noise caused by turbulence. Additionally, by controlling the blade outlet angle at the first upper outer end to be smaller than that at the first lower outer end, the outer ends of the blades can be twisted in a specific direction, resulting in higher outlet pressure and a higher head.

[0012] Furthermore, the blade inlet angle at the first lower inner end ranges from 10° to 40°, the blade outlet angle at the first upper outer end and the blade outlet angle at the first lower outer end range from 25° to 75°, and the long blade wrap angle ranges from 40° to 120°. Therefore, by controlling the blade inlet edges to have different blade inlet angles, blade outlet angles, and long blade wrap angles, the design requirements of impellers of different sizes can be met.

[0013] Furthermore, since the angle difference between the blade inlet angle at the first upper inner end and the blade inlet angle at the first lower inner end is in the range of (0°-15°), and the angle difference between the blade outlet angle at the first upper outer end and the blade outlet angle at the first lower outer end is also in the range of (0°-15°), the degree of twisting of the inner end of the long blade towards the outside can be controlled by controlling the range of the angle difference between the blade inlet angles at the first upper inner end and the first lower inner end. Similarly, the degree of twisting of the outer end of the long blade towards the outside can be controlled by controlling the range of the angle difference between the blade inlet angles at the first upper outer end and the first lower outer end. This allows for better control of the three-dimensional twisting of the long blade, optimizes the blade shape to better conform to the fluid flow trajectory, and further reduces fluid flow separation and secondary flow on the blade surface.

[0014] Furthermore, since the first upper inner end portion extends to the inner wall of the central water inlet of the upper cover plate, the fluid will be acted upon by the inner end of the long blade as soon as it enters the central water inlet.

[0015] Furthermore, the impeller of the water pump also includes short blades. Each short blade and at least one long blade form a blade group. Each blade group is evenly distributed around the central circumference of the central inlet pipe. The long blades and short blades in each blade group are spaced apart. The inner end of the short blade corresponds to the middle of the long blade, and the outer end of the short blade extends to the outer contour of the upper and lower cover plates. The blades near the central inlet pipe are actually long blades. The spacing between the inner ends of the long blades is relatively sparse. This allows for a larger flow space when the water enters from the central inlet pipe. When the water flows into the short blades, the presence of the short blades increases the outflow velocity and pressure, thus ensuring sufficient outflow velocity and pressure.

[0016] Furthermore, since the short blade is a twisted blade, the inner end of the short blade includes a second upper inner end that contacts the upper cover plate and a second lower inner end that contacts the lower cover plate. The inner end of the short blade gradually twists outward from the second lower inner end to the second upper inner end. The blade inlet angle at the second upper inner end is smaller than the blade inlet angle at the second lower inner end. The outer end of the short blade includes a second upper outer end that connects to the upper cover plate and a second lower outer end that connects to the lower cover plate. The outer end of the short blade gradually twists outward from the second lower outer end to the second upper outer end. The blade outlet angle at the second upper outer end is smaller than or equal to the blade outlet angle at the first lower outer end. Since the short blade is also designed as a twisted blade, the channel between the long blade and the short blade can better conform to the flow trajectory of the fluid.

[0017] Furthermore, since the angle difference between the blade inlet angle at the second upper inner end and the blade inlet angle at the second lower inner end is in the range of (0°-30°), and the angle difference between the blade outlet angle at the second upper outer end and the blade outlet angle at the second lower outer end is in the range of [0°-15°], the twisting state of the short blade can be further optimized to make it more in line with the flow trajectory of the fluid. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a structural cross-sectional view of Embodiment 1 of this utility model; Figure 2 This is a perspective view of Embodiment 1 of the present invention with the top cover plate hidden; Figure 3 This is a top view of embodiment 1 of the present invention, which conceals the upper cover plate; Figure 4 This is a top view of Embodiment 2 of this utility model; Figure 5 This is a perspective view of Embodiment 2 of the present invention with the lower cover plate hidden. Figure 6 This is a bottom view of Embodiment 2 of the present invention with the lower cover plate hidden; Figure 7 This is a perspective view of Embodiment 2 of the present invention with the top cover plate hidden; Figure 8 This is a top view of Embodiment 2 of the present invention with the top cover plate hidden; In the attached diagram: 100, impeller; 1, upper cover plate; 11, central inlet pipe; 2, lower cover plate; 3, long blade; 31, inner end; 311, first upper inner end; 312, first lower inner end; 32, outer end; 321, first upper outer end; 322, first lower outer end; 4, flow channel; 5, short blade; 51, second upper inner end; 52, second lower inner end; 53, second upper outer end; 54, second lower outer end. Detailed Implementation

[0020] The present invention will be further described in detail below through specific embodiments. Example 1

[0021] like Figures 1 to 3 As shown, a water pump impeller 100 includes an upper cover plate 1, a lower cover plate 2, and long blades 3 connecting the upper cover plate 1 and the lower cover plate 2. A fluid flow chamber is formed between the upper cover plate 1 and the lower cover plate 2. A central water inlet 11 communicating with the fluid flow chamber is provided at the center of the upper cover plate 1, and the central water inlet 11 corresponds to the position of the water inlet on the water pump casing. The long blades 3 divide the fluid flow chamber into several gradually expanding flow channels 4. An outlet communicating with each flow channel 4 is provided on the outer contour between the upper cover plate 1 and the lower cover plate 2. The long blades 3 are three-dimensional spatially twisted long blades 3, and the inner end 31 of the long blades 3 includes a connection with the upper cover plate 1. The first upper inner end 311 contacts the plate 1, and the first lower inner end 312 contacts the lower cover plate 2. The inner end 31 of the long blade 3 gradually twists outward from the first lower inner end 312 to the first upper inner end 311. The blade inlet angle at the first upper inner end 311 is smaller than the blade inlet angle at the first lower inner end 312. The outer end 32 of the long blade 3 includes a first upper outer end 321 connected to the upper cover plate 1 and a first lower outer end 322 connected to the lower cover plate 2. The outer end 32 of the long blade 3 gradually twists from the first lower outer end 322 to the first upper outer end 321. The blade outlet angle at the first upper outer end 321 is smaller than the blade outlet angle at the first lower outer end 322.

[0022] In this embodiment, the preferred number of long leaves 3 is six, and there are no short leaves 5.

[0023] like Figure 3 As shown, the blade inlet angle α1 at the first upper inner end 311 and the blade inlet angle α2 at the first lower inner end 312 have an angle range of 10°-40°, the blade outlet angle β1 at the first upper outer end 321 and the blade outlet angle β2 at the first lower outer end 322 have an angle range of 25°-75°, and the wrap angle of the long blade 3 is 40°-120°.

[0024] The blade inlet angle is the angle between the inner tip of the blade and the direction of rotation. This angle guides the fluid smoothly into the impeller 100, reducing inlet impact loss. The blade exit angle is the angle between the outer end of the blade and the direction of rotation. The exit angle directly affects the pump's head and efficiency. A larger exit angle can increase the centrifugal force on the fluid and increase the head, but it will lead to excessively high outlet velocity and increased friction loss. A smaller exit angle will reduce the velocity and reduce subsequent flow channel losses. Therefore, in this embodiment, the efficiency and noise of the impeller 100 are balanced by optimizing the blade inlet angle α1 at the first upper inner end 311, the blade inlet angle α2 at the first lower inner end 312, the blade exit angle β1 at the first upper outer end 321, and the blade exit angle β2 at the first lower outer end 322.

[0025] In addition, to better control the twisting amplitude of the inner end 31 and the outer end 32 of the long blade 3, the angle difference between the blade inlet angle at the first upper inner end 311 and the blade inlet angle at the first lower inner end 312 is (0°-15°), and the angle difference between the blade outlet angle at the first upper outer end 321 and the blade outlet angle at the first lower outer end 322 is (0°-15°).

[0026] In this embodiment, the angle difference between the blade inlet angle at the first upper inner end 311 and the blade inlet angle at the first lower inner end 312 is 7°, and the angle difference between the blade outlet angle at the first upper outer end 321 and the blade outlet angle at the first lower outer end 322 is 2°.

[0027] Furthermore, in this embodiment, the first upper inner end portion 311 extends to the inner wall of the central water inlet 11 of the upper cover plate 1.

[0028] The angle difference of the blade inlet angle is in the range of (0°-15°). The twisting of the long blade 3 at the inlet can make the fluid pressure evenly distributed radially, reduce inlet backflow (a common problem under low flow rate), and reduce surge noise caused by head fluctuation.

[0029] The blade exit angle ranges from 0° to 15°. This twisted blade, which varies in three dimensions along the radial and circumferential directions throughout the entire flow path, allows the blade angle to better match the fluid flow trajectory. This design reduces flow separation and secondary flow on the surface of the long blade, avoids the formation of local eddies, and thus reduces pressure pulsation and broadband noise caused by turbulence.

[0030] In this embodiment, the impeller diameter is 52mm, the blade wrap angle is 100°, the number of blades is 6, and the blade width is 4mm. The Fluent simulation software is used to simulate the pressure pulsation of the water pump. Three different monitoring points are set at the blade outlet edge to monitor the pressure change over time at the blade outlet edge. The pressure change with frequency is then obtained through Fourier transform, and finally, the pressure pulsation amplitude is obtained from the pressure pulsation spectrum. Specific simulation data are shown in the table below:

[0031] Example 1 is a conventional, non-twisted blade, while Examples 2 to 4 are simulation data of different blade twisting conditions in this embodiment. From the simulation results above, it can be found that in this embodiment, the pressure pulsation amplitude of the blade in the twisted state is significantly smaller than that of the blade in the non-twisted state. Example 2

[0032] like Figures 4 to 8 As shown, this embodiment is a further improvement and optimization based on embodiment 1. The pump impeller 100 further includes short blades 5. Each short blade 5 and at least one long blade 3 form a blade group. The long blades 3 and short blades 5 in each blade group are spaced apart. In this embodiment, every two long blades 3 and one short blade 5 form a blade group. Each blade group is evenly distributed around the central circumference of the central water inlet 11. The two long blades 3 in each blade group are spaced apart. The short blade 5 in each blade group is located between the two long blades 3 in adjacent groups. The inner end of the short blade 5 corresponds to the middle of the long blade 3, and the outer end of the short blade 5 extends to the outer contour of the upper cover plate 1 and the lower cover plate 2.

[0033] Of course, a long leaf 3 and a short leaf 5 can also be used to form a leaf group, thus creating a leaf arrangement pattern in which long and short leaves are interspersed.

[0034] By adding short blades 5, the pressure of the fluid at the outlet of the impeller 100 can be further increased, thereby improving efficiency and head. At the same time, since the inner end of the short blades 5 corresponds to the middle of the long blades 3, the fluid inlet area of ​​the central water inlet 11 is not blocked by the short blades 5, thus increasing the water inlet area.

[0035] The short blade 5 can be a conventional, non-twisted blade with an arc-shaped projection, or a three-dimensional twisted blade, such as... Figure 3 As shown, the short blade 5 is a twisted blade. The inner end 31 of the short blade 5 includes a second upper inner end 51 that contacts the upper cover plate 1 and a second lower inner end 52 that contacts the lower cover plate 2. The inner end 31 of the short blade 5 gradually twists outward from the second lower inner end 52 to the second upper inner end 51. The blade inlet angle at the second upper inner end 51 is smaller than the blade inlet angle at the second lower inner end 52. The outer end 32 of the short blade 5 includes a second upper outer end 53 that connects to the upper cover plate 1 and a second lower outer end 54 that connects to the lower cover plate 2. The outer end 32 of the short blade 5 gradually twists from the second lower outer end 54 to the second upper outer end 53. The blade outlet angle at the second upper outer end 53 is smaller than or equal to the blade outlet angle at the first lower outer end 322.

[0036] Preferably, the angle difference between the blade inlet angle at the second upper inner end 51 and the blade inlet angle at the second lower inner end 52 is in the range of (0°-30°), and the angle difference between the blade outlet angle at the second upper outer end 53 and the blade outlet angle at the second lower outer end 54 is in the range of [0°-15°]. That is, for the short blade 5, the angle difference between the blade outlet angle at the second upper outer end 53 and the blade outlet angle at the second lower outer end 54 can be 0. Figure 8 As shown, in this embodiment, the blade inlet angle at the second upper inner end 51 is α3, and the blade inlet angle at the second lower inner end 52 is α4. The angle difference between α3 and α4 is preferably 9° in this embodiment.

[0037] The blade inlet angle at the second upper inner end 51 and the blade inlet angle at the second lower inner end 52 are both in the range of 50°-70°, while the blade outlet angle at the second upper outer end 53 and the blade outlet angle at the second lower outer end 54 are both in the range of 25°-75°.

[0038] The blade inlet angle at the second upper inner end 51 is preferably α3, which is 56°; the blade inlet angle at the second lower inner end 52 is preferably α4, which is 65°; and the blade outlet angle β1 at the second upper outer end 53 is preferably 65°.

[0039] In this embodiment, the short blade 5 is integrally formed with the lower cover plate 2, while the long blade 3 is integrally formed with the upper cover plate 1. A long groove is provided on the upper surface of the lower cover plate 2, and a short groove is provided on the lower surface of the upper cover plate 1. This facilitates the assembly and welding of the long blade 3 and the short blade 5.

[0040] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications and alterations to the technical solution of the present utility model without departing from its design spirit shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A water pump impeller, comprising an upper cover plate, a lower cover plate, and elongated blades connecting the upper cover plate and the lower cover plate, wherein a fluid flow chamber is formed between the upper cover plate and the lower cover plate, a central inlet port communicating with the fluid flow chamber is provided at the center of the upper cover plate, the elongated blades divide the fluid flow chamber into a plurality of gradually expanding flow channels, and an outlet port communicating with each flow channel is provided on the outer contour between the upper cover plate and the lower cover plate, characterized in that: The long blade is a three-dimensional spatially twisted long blade. The inner end of the long blade includes a first upper inner end that contacts the upper cover plate and a first lower inner end that contacts the lower cover plate. The inner end of the long blade gradually twists outward from the first lower inner end to the first upper inner end. The blade inlet angle at the first upper inner end is smaller than the blade inlet angle at the first lower inner end. The outer end of the long blade includes a first upper outer end that connects to the upper cover plate and a first lower outer end that connects to the lower cover plate. The outer end of the long blade gradually twists from the first lower outer end to the first upper outer end. The blade outlet angle at the first upper outer end is smaller than the blade outlet angle at the first lower outer end.

2. A water pump impeller as described in claim 1, characterized in that: The blade inlet angle at the first upper inner end and the blade inlet angle at the first lower inner end range from 10° to 40°, the blade outlet angle at the first upper outer end and the blade outlet angle at the first lower outer end range from 25° to 75°, and the long blade wrap angle ranges from 40° to 120°.

3. A water pump impeller as described in claim 2, characterized in that: The angle difference between the blade inlet angle at the first upper inner end and the blade inlet angle at the first lower inner end is in the range of (0°-15°), and the angle difference between the blade outlet angle at the first upper outer end and the blade outlet angle at the first lower outer end is in the range of (0°-15°).

4. A water pump impeller as described in claim 3, characterized in that: The first upper inner end portion extends to the inner wall of the central water inlet of the upper cover plate.

5. A water pump impeller as described in claim 1, characterized in that: The water pump impeller also includes short blades. Each short blade and at least one long blade form a blade group. Each blade group is evenly distributed around the central circumference of the central water inlet. The long blades and short blades in each blade group are spaced apart. The inner end of the short blade corresponds to the middle of the long blade, and the outer end of the short blade extends to the outer contour of the upper cover plate and the lower cover plate.

6. A water pump impeller as described in claim 5, characterized in that: The short blade is a twisted blade. The inner end of the short blade includes a second upper inner end that contacts the upper cover plate and a second lower inner end that contacts the lower cover plate. The inner end of the short blade gradually twists outward from the second lower inner end to the second upper inner end. The blade inlet angle at the second upper inner end is smaller than the blade inlet angle at the second lower inner end. The outer end of the short blade includes a second upper outer end that connects to the upper cover plate and a second lower outer end that connects to the lower cover plate. The outer end of the short blade gradually twists from the second lower outer end to the second upper outer end. The blade outlet angle at the second upper outer end is smaller than or equal to the blade outlet angle at the first lower outer end.

7. A water pump impeller as described in claim 6, characterized in that: The angle difference between the blade inlet angle at the second upper inner end and the blade inlet angle at the second lower inner end is (0°-30°), and the angle difference between the blade outlet angle at the second upper outer end and the blade outlet angle at the second lower outer end is [0°-15°].

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