A high-speed impeller pump and its impeller

Abstract

The present invention discloses a high-speed impeller pump and its impeller, wherein the impeller comprises a hub and a plurality of bionic blades, wherein the plurality of bionic blades surround the outer periphery of the hub, and each of the bionic blades is bent in the same direction into a V-shape in the radial direction. The blades of the impeller of the high-speed impeller pump of the present invention are designed with reference to the bionic blades of bird wings, which can not only optimize the flow field and reduce noise, but also improve the order noise of the air pump, which is more conducive to the comfort and pleasure of the human ear. The high-speed impeller pump of the present invention is a side groove pump structure, and adopts bionic blades with a V-shaped structure. Compared with a straight blade pump, the outlet airflow is smoother, and the outlet total pressure distribution of the bionic blade pump is better, which is significantly greater than the outlet total pressure of the existing straight blade pump. The high-speed impeller pump has the advantages of compact structure, small size, light weight, and low noise.

Description

Technical Field

[0001] The invention belongs to the technical field of air pumps, and in particular relates to a high-speed impeller pump and an impeller thereof. Background Art

[0002] Side channel pumps, also known as secondary air pumps, have been widely used in the industrial field. They include the pump housing mechanical part and the motor. The motor drives the impeller to rotate synchronously to make the air flow, so as to achieve the effect of transporting air. The secondary air pump has an ideal internal flow field. Under high resistance and high power conditions, it still has the ability to provide the large air volume required by the three-way catalytic converter. It is an ideal helper to reduce harmful gases and particles in the exhaust system.

[0003] The side channel pump works by receiving instructions from the car engine controller, blowing additional air into the car's exhaust manifold to increase the oxygen content, allowing harmful substances in the exhaust gas such as carbon monoxide and hydrocarbons to burn again in a high-temperature environment, and cooperating with the three-way catalytic converter and the oxidized particulate matter filter to reduce the content of harmful gases and particulate matter in the car's exhaust, thereby helping the entire vehicle meet the National VI emission standards.

[0004] Most of the existing side channel pump impeller blades adopt a simple straight blade structure (such as Figure 1 As shown in the figure, the shell surface has no special shape and is only used as the outer shell of the impeller. With the implementation of the National VI emission standards, vehicle manufacturers pay more attention to automobile exhaust treatment. They not only require the impeller pump to provide large air volume and high efficiency, but also take the noise and sound quality of the impeller pump as important evaluation indicators. It can be seen that the traditional straight blade structure shell pump can no longer meet the strict requirements of vehicle manufacturers. Therefore, it is urgent to develop an impeller pump with large air volume and low noise to fully meet the needs of vehicle customers. Summary of the invention

[0005] In view of the technical problem that the existing side channel pumps cannot meet the requirements of large air volume and low noise at the same time, the first purpose of the present invention is to provide an impeller of a high-speed impeller pump, which has the advantages of large air volume and low noise.

[0006] The impeller of the high-speed impeller pump of the present invention comprises a hub and a plurality of bionic blades, wherein the plurality of bionic blades surround the periphery of the hub, and the bionic blades are bent in the same direction into a V-shape in the radial direction.

[0007] Preferably, the thickness of the bionic blade gradually decreases from the bending point to the end.

[0008] Preferably, ribs are provided between the roots of the bionic blades, and the ribs connect the roots of the bionic blades into one.

[0009] Preferably, the bending point of the bionic blade is in the middle, and the rib is perpendicular to the axial direction of the impeller and the outer peripheral edge extends to the bending point of the bionic blade.

[0010] Furthermore, the two corners of the outer edges of the ribs between the bionic blades extend outward along the blades to form a clamp-like angle. When the impeller runs at high speed, the blade bending point is subjected to greater force. The outer edges of the ribs and the bending point are on the same radius and are in the shape of crab claws, which can effectively strengthen the strength of the blade.

[0011] Furthermore, the size of the clamp angle is 110-130°, preferably 120°.

[0012] Preferably, the angle between the bionic blade root and the outer peripheral side surface of the hub is 45 to 75°, preferably 45 to 60°, and more preferably 50°.

[0013] Preferably, the suction surface angle of the V-shaped angle of the bionic blade bend is 110-130°, and the pressure surface angle is 5-10° larger than the suction surface angle. The suction surface angle refers to the angle formed by the two bending surfaces on the convex side, and the pressure surface angle refers to the angle formed by the two bending surfaces on the concave side.

[0014] Furthermore, the suction surface angle of the V-shaped angle of the bionic blade bend is 110-120°, and the pressure surface angle is 120-130°; more preferably, the suction surface angle is 117-118°, and the pressure surface angle is 124-126°.

[0015] Preferably, the number of the bionic blades is 50 to 70, preferably 55 to 60, and more preferably 58.

[0016] For rotating machinery, rotating parts are the most important key parts; birds have excellent flying ability, some can fly silently, and some can fly efficiently. These characteristics are of great guiding significance for improving the aerodynamic performance and acoustic characteristics of impeller blades, wing blades and other aerodynamics. Based on the bionic principle, the present invention uses its noise reduction characteristics. The bionic blade presents a V-shaped groove shape, just like the flying shape of a bird's wing. A solid model of the bionic blade is established. After processing and manufacturing rapid prototyping samples, its aerodynamic characteristics are verified. The results show that the aerodynamic performance of the bionic blade is better than that of the straight blade, the maximum flow rate is increased by 2.5%, and the maximum static pressure is increased by 7.5%; the reason is that the V-shaped bending of the bionic blade plays a guiding role, allowing more airflow to flow out circumferentially, hindering the radial diffusion of airflow, and reducing radial loss, thereby increasing the outlet flow and pressure.

[0017] The leading edge of a bird's wing is thicker, the trailing edge is very thin, and the power is mainly concentrated at the root, so a rib structure is added to the root of the blade; the thickness distribution of the V-shaped structural groove from the turning point to the end of the airfoil is gradually reduced, showing the shape of a flying bird's wing; the present invention refers to the geometric characteristics of the bird's wing to design each airfoil section, and fits and corrects the established 3D blade model; based on the characteristics of the bird's wing, the air pump blade airfoil is biomimetic designed, and the bionic blade is tested for noise. The test results show that the bionic airfoil impeller pump has better aerodynamic performance, and the gradual thickness change from the blade root to the blade top has a significant effect on reducing aerodynamic noise.

[0018] Preferably, the wheel hub comprises a wheel hub disc, a coupling structure arranged at the center of the wheel hub disc, a wheel hub outer ring arranged at the outer edge of the wheel hub disc, and a plurality of wheel hub middle rings arranged at intervals on the wheel hub disc.

[0019] The coupling structure, the hub middle ring and the hub outer ring are arranged in sequence from the inside to the outside, and a circular groove is formed between them, which can enable the impeller pump to obtain a better pressure increase. Furthermore, the clearance between the impeller pump and the upper end cover can effectively improve the total pressure capacity of the pump, which is crucial for high-pressure head conditions. Under the condition of equal power, the pressure head and air volume are significantly improved.

[0020] Furthermore, the hub disc is provided with a plurality of radial reinforcing ribs between the coupling structure and the outer ring of the hub. The reinforcing ribs penetrate the circular groove in the radial direction to play a reinforcing role. The reinforcing ribs can improve the strength of the impeller, overcome the irregular shaking of the impeller during high-speed rotation, and further avoid abnormal noise caused by the shaking of the impeller, thereby optimizing the comfort level of the sound.

[0021] The second object of the present invention is to provide a high-speed impeller pump, comprising a volute, an impeller installed in the volute, and an upper end cover covering the volute and the impeller, characterized in that the impeller is the impeller of any of the above-mentioned high-speed impeller pumps.

[0022] Preferably, a plurality of circular protrusions are provided in the middle portion of the inner side of the upper end cover, an upper volute groove is provided at a portion of the inner side of the upper end cover corresponding to the bionic blade, and an air inlet vertically leading to the outside is provided at the starting end of the upper volute groove; a lower volute groove corresponding to the upper volute groove is provided in the volute casing, and an air outlet horizontally leading to the outside is provided at the end of the lower volute groove.

[0023] The inner side of the upper end cover of the high-speed impeller pump is provided with a circular protrusion which matches the circular groove of the impeller to form a labyrinth groove shape. After sample trial production and verification, the smaller the gap matching, the greater the air volume that the air pump can provide under specific working conditions. The use of the labyrinth groove shape can increase the pressure difference of the air pump and make it easier to achieve performance indicators.

[0024] The high-speed impeller pump is a side groove pump structure, in which the impeller can work by connecting to the drive motor through a coupling structure, and can be used for automobile exhaust treatment. The working principle is: the upper and lower volutes on both sides of the impeller blades form a side channel. When the blades rotate, the centrifugal force causes the gas to flow forward and outward, thereby forming a series of spiral movements. The air between the blades accelerates and rotates in a spiral shape, and squeezes the gas outside the pump body into the side channel. When the gas enters the side channel and is compressed, it returns to the blades and rotates again. When the air passes through the impeller and the side channel along a spiral track, each impeller blade increases the degree of compression and acceleration. As the rotation proceeds, the kinetic energy of the gas increases, so that the pressure of the gas passing along the side channel is further increased. When the air reaches the outlet at the end of the volute, the gas is squeezed out of the impeller and enters the engine exhaust system through the outlet hose for secondary combustion. The secondary air pump preheats the three-way catalytic converter (KAT) during cold start or idling, allowing it to start working quickly and reduce harmful gas emissions; it regenerates the oxidized particulate filter (OPF), that is, it runs continuously for 10 minutes after every 100 kilometers the car has traveled, in order to clean the carbon deposits in the OPF, allowing the OPF to function again and reduce harmful gas and particulate pollution emissions.

[0025] Compared with the prior art, the high-speed impeller pump of the present invention has the following advantages:

[0026] 1. The blades of the impeller of the high-speed impeller pump of the present invention are designed by bionic blades with reference to bird wings, which can not only optimize the flow field and reduce noise, but also improve the order noise of the air pump, which is more conducive to the comfort and pleasure of the human ear.

[0027] 2. The impeller of the high-speed impeller pump of the present invention is provided with ribs between the blades, and the bent blade structure improves the blade strength through a circle of appropriate ribs, overcomes the changes in the blade profile caused by the radial and axial straightening of the blades under the action of centrifugal force during high-speed rotation, and ensures the stability of the blade operating performance.

[0028] 3. In the impeller of the high-speed impeller pump of the present invention, the coupling structure, the hub middle ring and the hub outer ring are arranged in sequence from the inside to the outside, and a circular groove is formed between them, so that the impeller pump can obtain a better pressure increase. Furthermore, it cooperates with the clearance of the upper end cover of the impeller pump to effectively improve the total pressure capacity of the pump, which is crucial for high-pressure head conditions. Under the condition of equal power, it has the characteristics of significantly improved pressure head and air volume.

[0029] 4. The hub disk of the impeller of the high-speed impeller pump of the present invention is provided with reinforcing ribs, which improve the strength of the impeller, overcome the irregular jitter of the impeller during high-speed rotation, avoid the abnormal noise caused by the impeller jitter, and thus optimize the comfort level of the sound.

[0030] 5. The high-speed impeller pump of the present invention adopts a side groove pump structure, which is compact, small in size, light in weight and low in noise. In the high-speed impeller pump of the present invention, the hub and blade structures of the impeller are optimized, and the clearance between the hub and the upper end cover cooperates to form a labyrinth groove structure to improve the total pressure capacity of the pump; the high-speed impeller pump with bionic blades of V-shaped structure has a smoother outlet airflow than the straight blade pump; and the bionic blade pump has a better outlet total pressure distribution, which is significantly greater than the outlet total pressure of the existing straight blade pump. The reason is that the bent blade surface can hinder the radial diffusion of the airflow, reduce radial loss, and play a guiding role to make more airflow flow out circumferentially, thereby increasing the outlet flow and pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of an existing air pump impeller;

[0032] Figure 2 A three-dimensional diagram of an impeller of a high-speed impeller pump of the present invention;

[0033] Figure 3 A top view of an impeller of a high-speed impeller pump of the present invention;

[0034] Figure 4 A bottom view of an impeller of a high-speed impeller pump of the present invention;

[0035] Figure 5 It is a partially enlarged schematic diagram of a top view of an impeller of a high-speed impeller pump of the present invention;

[0036] Figure 6 A three-dimensional diagram of a high-speed impeller pump of the present invention;

[0037] Figure 7 A top view of the high-speed impeller pump of the present invention;

[0038] Figure 8 A bottom view of the high-speed impeller pump of the present invention;

[0039] Fig. 9 A three-dimensional view (inside perspective) of the upper end cover of the high-speed impeller pump of the present invention;

[0040] Fig.10 A three-dimensional view of the upper end cover of the high-speed impeller pump of the present invention (from an outside perspective);

[0041] Fig.11 It is a partial cross-sectional view of the high-speed impeller pump of the present invention;

[0042] Fig.12 The pressure difference-air volume performance curves of the high-speed impeller pump of the present invention and the existing impeller pump;

[0043] Fig.13 It is a spectrum analysis diagram of the high-speed impeller pump of the present invention and the existing impeller pump.

[0044] Reference numerals

[0045] Impeller 1, hub 11, hub disc 111, coupling structure 112, hub outer ring 113, hub middle ring 114, reinforcing rib 115, bionic blade 12;

[0046] Upper end cover 2, circular protrusion 21, upper volute 22, air inlet 23, external reinforcement rib 24;

[0047] Volute 3, lower volute groove 31, air outlet 32. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with specific examples. It should be understood that the following examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0049] Example 1 An impeller of a high-speed impeller pump

[0050] Figure 2-Figure 4 The impeller 1 of a high-speed impeller pump according to a preferred embodiment of the present invention is shown, which includes a hub 11 and a plurality of bionic blades 12 (the number shown in the figure is 58).

[0051] The wheel hub 11 includes a wheel hub disc 111, a coupling structure 112 disposed at the center of the wheel hub disc 111, a wheel hub outer ring 113 disposed at the outer edge of the wheel hub disc 111, and two wheel hub middle rings 114 disposed at intervals on the wheel hub disc 111. The coupling structure 112, the wheel hub middle ring 114 and the wheel hub outer ring 113 are arranged in sequence from the inside to the outside, and a circular groove is formed therebetween. A plurality of (twelve in the figure, arranged at equal intervals) radial reinforcing ribs 115 are disposed between the coupling structure 112 and the wheel hub outer ring 113, and the reinforcing ribs 115 radially penetrate the circular groove to play a reinforcing role.

[0052] The bionic blades 12 surround the outer periphery of the hub outer ring 113 and extend outward. In the radial direction, each bionic blade 12 is bent in the same direction into a V shape. The bending point of the bionic blade 12 is in the middle, and the thickness gradually decreases from the bending point to the end (from the middle to the two ends). Ribs 13 are provided between the roots of the bionic blades 12, and the ribs 13 connect the roots of each bionic blade 12 as a whole. Preferably, the ribs 13 are perpendicular to the impeller axial direction and the outer edge extends to the bending point of the bionic blade.

[0053] Better, such as Figure 3As shown, the angle A between the root of the bionic blade 12 and the side of the hub outer ring 113 is 45-75°, and the V-shaped angle of the bionic blade bend is 120-150°. Further, the angle formed by the two bending surfaces on the convex side of the bionic blade 12 is the suction surface angle B, and the angle formed by the two bending surfaces on the concave side is the pressure surface angle C, wherein the suction surface angle B is 110-130°, and the pressure surface angle C is 5-10° greater than the suction surface angle B. Preferably, the suction surface angle B is 110-120°, and the pressure surface angle C is 120-130°; more preferably, the suction surface angle B is 117-118°, and the pressure surface angle C is 124-126°.

[0054] like Figure 5 As shown, the two corners of the outer edge of the rib 13 between the bionic blades 12 extend outward along the blade to form a clamp-shaped angle D. When the impeller 1 runs at high speed, the blade bending point is subjected to greater force. The outer edge of the rib 13 and the bending point are on the same radius and are in a crab-claw shape, which can effectively strengthen the strength of the blade. Preferably, the size of the two clamp-shaped angles D of the outer edge of the rib 13 is 110-130°, preferably 120°.

[0055] For rotating machinery, rotating parts are the most important key parts; birds have excellent flying ability, some can fly silently, and some can fly efficiently. These characteristics are of great guiding significance for improving the aerodynamic performance and acoustic characteristics of impeller blades, wing blades and other aerodynamics. The present invention is based on the bionic principle and uses its noise reduction characteristics. The bionic blade 12 presents a V-shaped groove shape, just like the flying shape of a bird wing. A solid model of the bionic blade is established. After processing and manufacturing rapid prototyping samples, its aerodynamic characteristics are verified. The results show that the aerodynamic performance of the bionic blade 12 is better than that of the straight blade, the maximum flow rate is increased by 2.5%, and the maximum static pressure is increased by 7.5%; the reason is that the V-shaped bending of the bionic blade plays a guiding role, allowing more airflow to flow out circumferentially, hindering the radial diffusion of airflow, reducing radial loss, thereby increasing the outlet flow and pressure.

[0056] The leading edge of a bird's wing is thicker, the trailing edge is very thin, and the power is mainly concentrated at the root. Therefore, the present invention adds a rib structure at the root of the blade; the thickness distribution of the V-shaped structural groove from the turning point to the end of the airfoil gradually decreases, presenting the shape of a flying bird wing; the present invention refers to the geometric characteristics of the bird's wing to design each airfoil section, and fits and corrects the established 3D blade model; based on the characteristics of the bird's wing, the air pump blade airfoil is biomimetic designed, and the bionic blade is tested for noise. The test results show that the bionic airfoil impeller pump has better aerodynamic performance, and the gradual thickness change from the blade root to the blade top has a significant effect on reducing aerodynamic noise.

[0057] In the impeller of the high-speed impeller pump of the present invention, the coupling structure 112, the hub middle ring 114 and the hub outer ring 113 are arranged in sequence from the inside to the outside, and a circular groove is formed between them, so that the impeller pump can obtain a better pressure increase. Furthermore, the clearance between the impeller pump and the upper end cover of the impeller pump can effectively improve the total pressure capacity of the pump, which is very important for high-pressure head working conditions. Under the condition of equal power, it has the characteristics of significantly improving the pressure head and air volume.

[0058] Example 2 A high-speed impeller pump

[0059] Figure 6-Figure 8 A high-speed impeller pump of a preferred embodiment of the present invention is shown, which includes an impeller 1, an upper end cover 2 and a volute 3 of Embodiment 1. The impeller 1 is an integral injection-molded product, installed in the volute 3; the upper end cover 2 and the volute 3 are die-cast products made of aluminum, and the upper end cover 2 covers the volute 3 and is connected by a sealing ring and bolts.

[0060] like Figure 9-10 As shown, two circles of circular protrusions 21 are provided at the middle of the inner side of the upper end cover 2 corresponding to the circular groove. When assembled, the circular protrusions 21 can be matched with the gaps of the two circles of circular grooves formed between the two hub middle rings 114 and the hub outer rings 113; an upper volute 22 is provided at the inner side of the upper end cover 2 corresponding to the bionic blade 12, and an air inlet 23 vertically leading to the outside is provided at the starting end of the upper volute 22. External reinforcing ribs 24 are provided on the outer surface of the upper end cover 1.

[0061] A lower volute 31 corresponding to the upper volute 22 is provided in the volute casing 3 , and an air outlet 32 ​​horizontally leading to the outside is provided at the end of the lower volute 31 .

[0062] like Fig.11 As shown, the circular protrusion 21 of the upper end cover 2 can be inserted into the two circular grooves formed between the two hub middle rings 114 and the hub outer ring 113 of the impeller 1 to form a clearance fit and form a labyrinth groove shape. After sample trial production and verification, the smaller the clearance match, the greater the air volume that the air pump can provide under specific working conditions; it can be seen that the use of the labyrinth groove increases the pressure difference of the air pump and makes it easier to achieve performance indicators.

[0063] The high-speed impeller pump is a side groove pump structure, wherein the impeller 1 can work by connecting to the drive motor through the coupling structure 112, and can be used for automobile exhaust treatment. The working principle is: the upper volute 22 and the lower volute 31 on both sides of the impeller blade form a side channel. When the blade rotates, the centrifugal force causes the gas to flow forward and outward, thereby forming a series of spiral movements. The air between the blades accelerates and rotates in a spiral shape, and squeezes the gas outside the pump body into the side channel. When the gas enters the side channel and is compressed, it returns to the blades and is accelerated again. When the air passes through the impeller and the side channel along a spiral track, each impeller blade increases the degree of compression and acceleration. As the rotation proceeds, the kinetic energy of the gas increases, so that the pressure of the gas passing along the side channel is further increased. When the air reaches the outlet at the end of the volute, the gas is squeezed out of the impeller and enters the engine exhaust system through the outlet hose for secondary combustion. The secondary air pump preheats the three-way catalytic converter (KAT) during cold start or idling, allowing it to start working quickly and reduce harmful gas emissions; it regenerates the oxidized particulate filter (OPF), that is, it runs continuously for 10 minutes after every 100 kilometers the car has traveled, in order to clean the carbon deposits in the OPF, allowing the OPF to function again and reduce harmful gas and particulate pollution emissions.

[0064] Compared with the existing impeller pump, the design key points and positive improvement effects of the present invention are:

[0065] 1. The blades of the impeller of the high-speed impeller pump of the present invention are designed by bionic blades with reference to bird wings, which can not only optimize the flow field and reduce noise, but also improve the order noise of the air pump, which is more conducive to the comfort and pleasure of the human ear.

[0066] 2. The impeller of the high-speed impeller pump of the present invention is provided with ribs between the blades, and the bent blade structure improves the blade strength through a circle of appropriate ribs, overcomes the changes in the blade profile caused by the radial and axial straightening of the blades under the action of centrifugal force during high-speed rotation, and ensures the stability of the blade operating performance.

[0067] 3. In the impeller of the high-speed impeller pump of the present invention, the coupling structure, the hub middle ring and the hub outer ring are arranged in sequence from the inside to the outside, and a circular groove is formed between them, which can enable the impeller pump to obtain a better pressure increase. Furthermore, the clearance between it and the upper end cover of the impeller pump can effectively improve the total pressure capacity of the pump, which is crucial for high-pressure head conditions. Under the condition of equal power, it has the characteristics of significantly improved pressure head and air volume.

[0068] 4. The hub disk of the impeller of the high-speed impeller pump of the present invention is provided with reinforcing ribs, which improve the strength of the impeller, overcome the irregular jitter of the impeller during high-speed rotation, avoid the abnormal noise caused by the impeller jitter, and thus optimize the comfort level of the sound.

[0069] 5. The inner side of the upper end cover of the high-speed impeller pump of the present invention is provided with a circular protrusion which is matched with the circular groove of the impeller to form a labyrinth groove shape. After sample trial production and verification, the smaller the gap matching, the greater the air volume that the air pump can provide under specific working conditions. The use of the labyrinth groove shape can increase the pressure difference of the air pump and make it easier to achieve performance indicators.

[0070] 6. In the high-speed impeller pump of the present invention, the hub and blade structures of the impeller are optimized, and the clearance between the hub and the upper end cover forms a labyrinth groove structure to improve the total pressure capacity of the pump; the high-speed impeller pump with a V-shaped bionic blade has a more stable outlet airflow than a straight blade pump; and the outlet total pressure distribution of the bionic blade pump is better, which is significantly greater than the outlet total pressure of the existing straight blade pump. The reason is that the curved blade surface can hinder the radial diffusion of the airflow, reduce radial loss, and play a guiding role to make more airflow flow out circumferentially, thereby increasing the outlet flow and pressure.

[0071] The main parameters for selecting high-pressure air pumps are: power, air volume, air pressure (certain requirements are required for calculation), voltage, etc., and the pressure-flow curve corresponding to the high-pressure air pump; and large air volume and increased pressure difference are the core competitive highlights of the high-speed impeller pump of the present invention. The applicant has carried out small-batch sample trial production of the high-speed impeller pump of the present invention, and conducted comparative tests on the high-speed impeller pump of the present invention and the existing straight-blade impeller pump. After verification by the pneumatic performance test bench, in general, the air volume and efficiency of the high-speed impeller pump of the present invention are in line with expectations; under the specific pressure difference of 225mbar, the speed is 18900rpm and the air volume reaches 19.22kg / h.

[0072] Fig.12 The pressure difference-air volume performance curve obtained by testing the high-speed impeller pump of the present invention and the existing impeller pump is shown in the figure. It can be seen from the curve that, compared with the existing impeller pump, the air volume and pressure difference of the high-speed impeller pump of the present invention are significantly improved.

[0073] Fig.13 The high-speed impeller pump of the present invention and the existing impeller pump. It can be seen from the figure that in terms of noise reduction, the noise characteristics of the high-speed impeller pump of the present invention are obviously better than those of the existing impeller pump, the amplitude of the vertical coordinate sticking force of the high-speed impeller pump of the present invention is obviously shifted downward, the vibration transmission is reduced, and the noise is obviously improved.

[0074] The above test results show that the high-speed impeller pump of the present invention not only has better aerodynamic performance than the existing impeller pump, but also has better noise than the existing impeller pump. The hub and blade structures of the impeller of the present invention are optimized. The clearance between the hub and the upper end cover forms a labyrinth groove structure to improve the total pressure capacity of the pump. At the same time, the high-speed impeller pump with a V-shaped bionic blade has a smoother outlet airflow than the straight blade pump. Moreover, the outlet total pressure distribution of the bionic blade pump is better, which is significantly greater than the outlet total pressure of the existing straight blade pump. The reason is that the curved blade surface can hinder the radial diffusion of the airflow, reduce radial loss, and play a guiding role to make more airflow flow out circumferentially, thereby increasing the outlet flow and pressure. The trailing edge of the straight blade is more prone to boundary layer separation, and its boundary layer separation area is larger than the boundary layer separation area of ​​the bionic blade surface. Therefore, the boundary layer separation vortex shedding noise of the straight blade is large, and the bending point of the bionic blade breaks the energy group of vortex shedding on the blade surface, reducing the sound energy.

[0075] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without departing from the innovation of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An impeller of a high-speed impeller pump, characterized in that: It comprises a hub and a plurality of bionic blades, wherein the plurality of bionic blades surround the periphery of the hub, and the bionic blades are bent in the same direction into a V-shape in the radial direction; The thickness of the bionic blade gradually decreases from the bending point to the end; The angle between the root of the bionic blade and the outer side of the hub is 45-75°; the suction surface angle of the V-shaped angle of the bionic blade is 110-130°, and the pressure surface angle is 5-10° greater than the suction surface angle; A rib is provided between the roots of the bionic blades, and the rib connects the roots of the bionic blades into one; The bending point of the bionic blade is in the middle, the rib is perpendicular to the impeller axis and the outer edge extends to the bending point of the bionic blade; the two corners of the outer edge of the rib between the bionic blades extend outward along the blade to form a clamp-shaped angle.

2. The impeller of the high-speed impeller pump according to claim 1, characterized in that: The number of the bionic blades is 50 to 70.

3. The impeller of the high-speed impeller pump according to claim 1, characterized in that: The wheel hub comprises a wheel hub disc, a coupling structure arranged at the center of the wheel hub disc, a wheel hub outer ring arranged at the outer edge of the wheel hub disc, and a plurality of wheel hub middle rings arranged at intervals on the wheel hub disc.

4. The impeller of the high-speed impeller pump according to claim 3, characterized in that: A plurality of radial reinforcing ribs are arranged on the hub disc between the coupling structure and the outer ring of the hub.

5. A high-speed impeller pump, comprising a volute, an impeller mounted in the volute, and an upper end cover covering the volute and the impeller, characterized in that: The impeller is an impeller of a high-speed impeller pump according to any one of claims 1 to 4.

6. The high-speed impeller pump according to claim 5, characterized in that: A plurality of circular protrusions are provided in the middle portion of the inner side of the upper end cover, an upper volute groove is provided at a portion of the inner side of the upper end cover corresponding to the bionic blade, and an air inlet vertically leading to the outside is provided at the starting end of the upper volute groove; a lower volute groove corresponding to the upper volute groove is provided in the volute casing, and an air outlet horizontally leading to the outside is provided at the end of the lower volute groove.

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