A high-speed impeller

Abstract

The present invention discloses a high-speed impeller, which includes an impeller body comprising an upper disc member and a lower disc member arranged coaxially. The upper disc member and the lower disc member are connected by a plurality of blades arranged in an annular array. An air inlet is provided on the upper disc member, and the lower disc member is fixed to a rotating motor; a pressure relief hole penetrates through a pair of parallel planes of the lower disc member, and a plurality of pressure relief holes are arranged in an annular array around the axis of the lower disc member itself; a skirt includes an upper skirt respectively located at the edge of the upper disc member and extending radially, and also includes a lower skirt at the edge of the lower disc member and extending radially. The blades are located between the pressure relief holes and the skirt. Using this invention can reduce the pressure and speed in case of blockage of the air inlet, and protect the impeller. The two skirts can increase the structural strength of the connection between the blades and the upper and lower disc members without increasing the wind resistance during the operation of the impeller, and improve the overall structural strength at high rotational speeds.

Description

Technical Field

[0001] The present invention relates to the field of impellers, and particularly to a high-speed impeller. Background Art

[0002] Nowadays, brushless motors used in vacuum cleaners are increasingly favored by the market due to their small size and high suction power. The core part of this motor is its impeller. However, with the increase in rotational speed, the current conventional impeller structure can no longer meet the requirements. The existing impeller consists of three parts: an upper piece, a middle piece, and a lower piece. These three parts are riveted and fixed through the convex points on the middle piece and the holes on the upper and lower pieces. At higher and higher rotational speeds, it will cause material fatigue and may ultimately lead to the disintegration of the impeller. Summary of the Invention

[0003] The problem to be solved by the present invention is to provide a high-speed impeller that can relieve pressure and reduce speed in case of blockage of the air inlet to protect the impeller. The two skirt edges increase the structural strength at the connection between the blades and the upper and lower disc parts without increasing the air resistance during the operation of the impeller, and improve the overall structural strength at high rotational speeds.

[0004] To solve the above problems, the present invention provides a high-speed impeller. To achieve the above object, the technical solution adopted by the present invention to solve its technical problems is:

[0005] A high-speed impeller includes: an impeller body, which includes an upper disc part and a lower disc part arranged coaxially. The upper disc part and the lower disc part are connected by a plurality of blades arranged in a circular array. The upper disc part is provided with an air inlet, and the lower disc part is fixed to a rotating motor; pressure relief holes, which penetrate a pair of parallel planes of the lower disc part, and a plurality of pressure relief holes are arranged in a circular array around the axis of the lower disc part itself; skirt edges, which include an upper skirt edge respectively located at the edge of the upper disc part and extending radially, and also include a lower skirt edge located at the edge of the lower disc part and extending radially. The blades are located between the pressure relief holes and the skirt edges.

[0006] The beneficial effects of adopting the above technical solution are as follows: Vent holes are added to the impeller, effectively reducing the pressure and deformation of the impeller. The added upper skirt and lower skirt effectively increase the strength of this part, enabling the impeller to operate stably at high speeds. Relief holes are added at the root of the impeller, forming a small passage on the positive pressure side and negative pressure side of the impeller. When air enters from the outside, this passage does not leak, but once the air inlet is completely blocked, it can play the role of relieving pressure and reducing speed, thereby protecting the impeller and the motor. At the same time, since the original blades are generally riveted to the upper disc and lower disc, the distance from the outermost riveting interface to the wheel rim is relatively small, so the strength of this riveting interface is the weakest. Therefore, the diameters of the upper disc and lower disc are increased, and there are two parallel skirts that extend radially. There is almost no wind resistance during operation, but it can greatly strengthen the strength of the outermost riveting interface. In actual operation, it is found that the maximum rotational speed of the impeller of this technical solution is increased to 150,000 revolutions per minute, which is higher and more stable than the existing maximum rotational speed of 120,000 revolutions per minute. The upper skirt, lower skirt, and relief holes are two different design points and exist independently. They can be used separately or simultaneously to improve the comprehensive performance of the impeller.

[0007] As a further improvement of the present invention, a through hole for fixing to the output shaft of the rotating motor is provided at the centroid of the lower disc, and the diameter of the relief hole is smaller than the diameter of the through hole.

[0008] The beneficial effects of adopting the above technical solution are as follows: The diameter of the relief hole cannot be too large, otherwise it will affect the structural strength of the lower disc and the air output volume during the normal operation of the impeller.

[0009] As a further improvement of the present invention, the number of relief holes is equal to the number of blades, and the number of relief holes is nine.

[0010] The beneficial effects of adopting the above technical solution are as follows: The number of relief holes and blades is suitable for on-site needs, and the relief holes and blades correspond one by one.

[0011] As a further improvement of the present invention, the axial projection of the relief hole is entirely located within the air inlet.

[0012] The beneficial effects of adopting the above technical solution are as follows: The air path for relieving pressure is relatively smooth.

[0013] As a further improvement of the present invention, the maximum radial distance between the intersection of the blade and the upper disc and the axis of the upper disc itself is greater than the maximum radial distance between the intersection of the blade and the lower disc and the axis of the lower disc itself, and the rim radius of the upper skirt is greater than the rim radius of the lower skirt.

[0014] The beneficial effects of adopting the above technical solution are as follows: There is a certain inclination in the axial direction at the outermost edge of the impeller, so the rims of the upper skirt and lower skirt should also radially expand adaptively.

[0015] As a further improvement of the present invention, the radial dimension of the upper skirt is equal to the radial dimension of the lower skirt.

[0016] The beneficial effects of adopting the above technical solution are as follows: ensuring that the structural strengths of the upper skirt and the lower skirt are similar, and the radial widths of the upper skirt and the lower skirt are equal, which also reduces the assembly difficulty.

[0017] As a further improvement of the present invention, the diameter of the pressure relief hole is not greater than 2 mm, the minimum distance between the pressure relief hole and the adjacent blade is not less than 2 mm, and the radial dimensions of the upper skirt and the lower skirt are not less than 2 mm.

[0018] The beneficial effects of adopting the above technical solution are as follows: controlling the maximum diameter of the pressure relief hole, preventing the distance between the pressure relief hole and the blade from being too close, and avoiding excessive damage to the structural strength here.

[0019] As a further improvement of the present invention, the air inlet protrudes axially in the direction away from the lower disc member, the air inlet and the upper disc member are transitioned through a fillet section, and the axis of the air inlet itself coincides with the axis of the upper disc member itself.

[0020] The beneficial effects of adopting the above technical solution are as follows: the fillet section transition forms a flared air intake structure, reducing the air flow resistance.

[0021] As a further improvement of the present invention, the inner ring of the air inlet has a circle of fillet grooves, the fillet grooves have mutually perpendicular inner circumferential surfaces and annular surfaces, and the axis of the upper disc member itself is parallel to the inner circumferential surface and perpendicular to the annular surface.

[0022] The beneficial effects of adopting the above technical solution are as follows: the fillet grooves are convenient for sealed assembly with external components. During assembly, at least two vertical surfaces are in contact for sealing, and the sealing effect is good. At the same time, it can play a limiting role axially in one direction and radially. The fillet grooves play a role similar to a rabbet.

[0023] As a further improvement of the present invention, the blade is in contact connection with the fillet section, and the axial projection of the air inlet overlaps with the blade.

[0024] The beneficial effects of adopting the above technical solution are as follows: the fixed contact distance between the blade and the upper disc member is also long enough to ensure the structural strength of the integrated structure of the upper disc member, the blade, and the lower disc member. At the same time, the radial inward extension amount of the blade is also sufficient to ensure that sufficient centrifugal force can be generated on the gas during the operation of the impeller.

[0025] As a further improvement of the present invention, the material of the impeller body is not limited to aluminum, and can also be plastic, iron, copper, etc.

[0026] The beneficial effects of adopting the above technical solution are as follows: Aluminum has good physical properties while maintaining light weight, but this structure can also be made of many materials.

[0027] As a further improvement of the present invention, the assembly manner among the upper disc member, the lower disc member and the blades can be riveted to each other, integrally injection-molded, or separately injection-molded and then welded together by ultrasonic welding. The whole impeller body can also be milled from an integral blank by a CNC machine tool.

[0028] The beneficial effects of adopting the above technical solution are as follows: In order to adapt to high rotation speeds, but the structural improvement of the impeller body does not increase the manufacturing difficulty of the impeller body, and the manufacturing manner of the impeller body is not limited, so the manufacturing cost of the impeller body is controlled. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 is the front view of an embodiment of the present invention.

[0031] Figure 2 is the left view of an embodiment of the present invention.

[0032] Figure 3 is the rear view of an embodiment of the present invention.

[0033] Figure 4 is the perspective view of an embodiment of the present invention.

[0034] Figure 5 is the right view of an embodiment of the present invention.

[0035] Figure 6 is the A-A cross-sectional view of an embodiment of the present invention.

[0036] Figure 7 is the B-B cross-sectional view of an embodiment of the present invention.

[0037] Figure 8 is the C-C cross-sectional view of an embodiment of the present invention.

[0038] 1 - upper disc member; 2 - lower disc member; 3 - blade; 4 - pressure relief hole; 5 - through hole; 6 - air inlet; 7 - internal fillet groove; 8 - rounded corner section; 9 - upper skirt; 10 - lower skirt; D - first spacing; E - second spacing; F - third spacing; G - fourth spacing. Detailed Embodiments

[0039] The following further elaborates on the content of the present invention in conjunction with specific embodiments:

[0040] To achieve the object of the present invention, a high-speed impeller includes: an impeller body including an upper disc member 1 and a lower disc member 2 arranged coaxially. The upper disc member 1 and the lower disc member 2 are connected by a plurality of blades 3 arranged in an annular array. An air inlet 6 is provided on the upper disc member 1, and the lower disc member 2 is fixed to a rotating motor; a pressure relief hole 4 penetrates a pair of parallel planes of the lower disc member 2, and a plurality of pressure relief holes 4 are arranged in an annular array around the axis of the lower disc member 2 itself; a skirt includes an upper skirt 9 respectively located at the edge of the upper disc member 1 and extending radially, and also includes a lower skirt 10 at the edge of the lower disc member 2 and extending radially. The blade 3 is located between the pressure relief hole 4 and the skirt.

[0041] The beneficial effects of adopting the above technical solution are as follows: Pressure relief holes are added to the impeller, effectively reducing the pressure and deformation of the impeller. The added upper skirt and lower skirt effectively increase the strength of this part, enabling the impeller to operate stably at high speeds. Pressure relief holes are added at the root of the impeller, forming a small passage on the positive pressure side and negative pressure side of the impeller. When air enters from the outside, there is no leakage in this passage, but once the air inlet is completely blocked, it can achieve the purpose of relieving pressure and reducing speed, thereby protecting the impeller and the motor. At the same time, since the original blades are generally riveted to the upper and lower disc members, the distance from the outermost riveting interface to the wheel rim is relatively small, so the strength of this riveting interface is the weakest. Therefore, the diameters of the upper and lower disc members are increased, and two parallel skirts are provided. The skirts extend radially and hardly generate wind resistance during operation, but can greatly enhance the strength of the outermost riveting interface. In actual operation, it is found that the maximum rotational speed of the impeller of this technical solution is increased to 150,000 revolutions per minute, which is higher and more stable than the existing maximum rotational speed of 120,000 revolutions per minute. The upper skirt, lower skirt and pressure relief holes are two different design points and exist independently. They can be used separately or simultaneously to improve the comprehensive performance of the impeller.

[0042] In some other embodiments of the present invention, a through hole 5 for fixing the output shaft of the rotating motor is provided at the centroid of the lower disc member 2, and the diameter of the pressure relief hole 4 is smaller than the diameter of the through hole 5.

[0043] The beneficial effect of adopting the above technical solution is that the diameter of the pressure relief hole cannot be too large, otherwise it will affect the structural strength of the lower disc member and the air output volume during the normal operation of the impeller.

[0044] In some other embodiments of the present invention, the number of pressure relief holes 4 is equal to the number of blades 3, and the number of pressure relief holes 4 is nine.

[0045] The beneficial effect of adopting the above technical solution is that the number of pressure relief holes and blades is suitable for on-site needs, and the pressure relief holes and blades correspond one by one.

[0046] In some other embodiments of the present invention, the axial projection of the pressure relief hole 4 is entirely located within the air inlet 6.

[0047] The beneficial effect of adopting the above technical solution is that the air path for pressure relief is relatively smooth.

[0048] In some other embodiments of the present invention, the maximum radial distance between the junction of the blade 3 and the upper disc member 1 and the axis of the upper disc member 1 is greater than the maximum radial distance between the junction of the blade 3 and the lower disc member 2 and the axis of the lower disc member 2, and the rim radius of the upper skirt 9 is greater than the rim radius of the lower skirt 10.

[0049] The beneficial effect of adopting the above technical solution is that there is a certain inclination in the axial direction of the outermost edge of the impeller, so the rims of the upper skirt and the lower skirt should be radially expanded accordingly.

[0050] In some other embodiments of the present invention, the radial dimension of the upper skirt 9 is equal to the radial dimension of the lower skirt 10.

[0051] As Figure 7 、 Figure 8 shown, the value of the first spacing D is equal to the second spacing E. The values of the third spacing F and the fourth spacing G are equal.

[0052] The beneficial effect of adopting the above technical solution is that it ensures that the structural strengths of the upper skirt and the lower skirt are similar, the radial widths of the upper skirt and the lower skirt are equal, and it also reduces the assembly difficulty.

[0053] In some other embodiments of the present invention, the diameter of the pressure relief hole 4 is not greater than 2 mm, the minimum distance between the pressure relief hole 4 and the adjacent blade is not less than 2 mm, and the radial dimensions of the upper skirt 9 and the lower skirt 10 are not less than 2 mm.

[0054] As Figure 5 shown, the maximum radial distance between the junction of the blade 3 and the upper disc member 1 and the axis of the upper disc member 1 minus the maximum radial distance between the junction of the blade 3 and the lower disc member 2 and the axis of the lower disc member 2 gives the first spacing D, and the difference between the rim radius of the upper skirt 9 and the rim radius of the lower skirt 10 is the second spacing E.

[0055] The beneficial effect of adopting the above technical solution is that it controls the maximum diameter of the pressure relief hole and also prevents the pressure relief hole from being too close to the blade, avoiding excessive damage to the structural strength here.

[0056] In some other embodiments of the present invention, the air inlet 6 axially protrudes in the direction away from the lower disc member 2, the air inlet 6 and the upper disc member 1 are transitioned through a rounded corner section 8, and the axis of the air inlet 6 coincides with the axis of the upper disc member 1.

[0057] The beneficial effects of adopting the above technical solution are as follows: The rounded corner section forms an air inlet structure of a flared opening, reducing the air flow resistance.

[0058] In some other embodiments of the present invention, the inner ring of the air inlet 6 has a set of fillet grooves 7. The fillet grooves 7 have an inner circumferential surface and an annular surface that are perpendicular to each other. The axis of the upper disk member 1 is parallel to the inner circumferential surface and perpendicular to the annular surface.

[0059] The beneficial effects of adopting the above technical solution are as follows: The fillet grooves facilitate the sealed assembly with external components. During assembly, at least two vertical surfaces are in contact for sealing, with good sealing effect. At the same time, it can provide axial and radial unidirectional positioning. The fillet grooves play a role similar to that of a rabbet.

[0060] In some other embodiments of the present invention, the blade 3 is in contact connection with the rounded corner section 8. As Figure 1 shown, the axial projection of the air inlet 6 overlaps with the blade 3.

[0061] The beneficial effects of adopting the above technical solution are as follows: The fixed contact distance between the blade and the upper disk member is also long enough to ensure the structural strength of the integrated structure of the upper disk member, the blade, and the lower disk member. At the same time, the radial inward extension of the blade is also sufficient to ensure that sufficient centrifugal force can be generated on the gas during the operation of the impeller.

[0062] As a further improvement of the present invention, the material of the impeller body is not limited to aluminum, and can also be plastic, iron, copper, etc.

[0063] The beneficial effects of adopting the above technical solution are as follows: Aluminum has good physical properties while maintaining light weight, but this structure can also be adapted to many materials for manufacturing.

[0064] As a further improvement of the present invention, the assembly method between the upper disk member 1, the lower disk member 2, and the blade 3 can be mutually riveted, or integrally injection-molded, or separately injection-molded and then welded together by ultrasonic waves. The whole impeller body can also be milled out from an integral blank by a CNC machine tool.

[0065] The beneficial effects of adopting the above technical solution are as follows: In order to adapt to high speeds, but the structural improvement of the impeller body does not increase the manufacturing difficulty of the impeller body, and there is no limitation on the manufacturing method of the impeller body, so the manufacturing cost of the impeller body is controlled.

[0066] The above embodiments are only used to illustrate the technical concept and features of the present invention, and the purpose is to enable those familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A high-speed impeller, characterized in that, Comprising: An impeller body, including an upper disc part and a lower disc part arranged coaxially. The upper disc part and the lower disc part are connected by a plurality of blades arranged in an annular array. An air inlet is provided on the upper disc part, and the lower disc part is fixed to a rotating motor; a pressure relief hole, penetrating through a pair of parallel planes of the lower disc part, and a plurality of pressure relief holes are arranged in an annular array around the axis of the lower disc part itself; a skirt, including an upper skirt respectively located at the edge of the upper disc part and extending radially, and also including a lower skirt located at the edge of the lower disc part and extending radially. The blades are located between the pressure relief holes and the skirt; the outermost edge of the blade is axially inclined; the maximum radial distance between the junction of the blade and the upper disc part and the axis of the upper disc part itself is greater than the maximum radial distance between the junction of the blade and the lower disc part and the axis of the lower disc part itself, and the rim radius of the upper skirt is greater than the rim radius of the lower skirt; the maximum radial distance between the junction of the blade and the upper disc part and the axis of the upper disc part itself minus the maximum radial distance between the junction of the blade and the lower disc part and the axis of the lower disc part itself gives a first spacing D, and the difference between the rim radius of the upper skirt and the rim radius of the lower skirt is a second spacing E, and the value of the first spacing D is equal to the second spacing E; the minimum radial distance between the junction of the blade and the upper disc part and the rim of the upper skirt is a third spacing F, and the minimum radial distance between the junction of the blade and the lower disc part and the rim of the lower skirt is a fourth spacing G, and the values of the third spacing F and the fourth spacing G are equal; the inner ring of the air inlet has a circle of fillet grooves, and the fillet grooves have an inner circumferential surface and an annular surface perpendicular to each other. The axis of the upper disc part itself is parallel to the inner circumferential surface and perpendicular to the annular surface; the diameter of the pressure relief hole is not greater than 2 mm, the minimum distance between the pressure relief hole and the adjacent blade is not less than 2 mm, and the radial dimensions of the upper skirt and the lower skirt are not less than 2 mm.

2. The high-speed impeller according to claim 1, wherein: A through hole for fixing the output shaft of the rotating motor is provided at the centroid of the lower disc part, and the diameter of the pressure relief hole is smaller than the diameter of the through hole.

3. The high-speed impeller according to claim 2, wherein: The number of the pressure relief holes is equal to the number of the blades, and the number of the pressure relief holes is nine.

4. The high-speed impeller according to claim 3, characterized in that: The axial projection of the pressure relief hole is entirely located within the air inlet.

5. The high-speed impeller according to claim 1, characterized in that: The radial dimension of the upper skirt is equal to the radial dimension of the lower skirt.

6. The high-speed impeller according to claim 1, wherein: The air inlet axially protrudes in the direction away from the lower disc part, and the air inlet and the upper disc part are transitioned through a fillet section, and the axis of the air inlet itself coincides with the axis of the upper disc part itself.

7. The high-speed impeller according to claim 1, characterized in that: The blade is in contact connection with the fillet section, and there is an overlap between the axial projection of the air inlet and the blade.

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