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EP-4740787-A1 - HAIRDRYER IMPELLER AND MOTOR

EP4740787A1EP 4740787 A1EP4740787 A1EP 4740787A1EP-4740787-A1

Abstract

Provided is a high-speed high-pressure hairdryer motor and impeller, including a central shaft and a motor, where an impeller hub is fixedly mounted on the central shaft, a plurality of blades are fixedly mounted on the impeller hub, and both leading and trailing edges of the impeller hub are linear. A blade surface formed by a blade tip contour and a blade root contour of the blade is defined as a first blade surface, and the first blade surface is characterized by a straight transition. An airflow-guiding housing is arranged outside the blades, and a distance between points on a blade tip cambered surface and a bottom of the impeller hub conforms to a logarithmic function y(A)=a-b*ln(r). A curve of the impeller hub is a Bezier curve. Operational efficiency of the blades can be enhanced by improving smoothness of an airflow channel for the blades.

Inventors

  • ZHU, YUNFANG

Assignees

  • Cinderson Tech (Suzhou) Co., Ltd.

Dates

Publication Date
20260513
Application Date
20250331

Claims (13)

  1. A high-speed high-pressure hairdryer impeller, characterized by comprising a central shaft (1) and a motor, the central shaft (1) is the rotational axis of the impeller, wherein an impeller hub (2) is fixedly mounted on an upper side of the central shaft (1), a plurality of blades (3) are fixedly mounted on an external side of the impeller hub (2), and both leading and trailing edges of the impeller hub (2) are linear.
  2. The high-speed high-pressure hairdryer impeller according to claim 1, characterized in that a blade surface formed by a blade tip contour and a blade root contour of the blade (3) is defined as a first blade surface, and the first blade surface is characterized by a straight transition.
  3. The high-speed high-pressure hairdryer impeller according to claim 2, characterized in that an airflow-guiding housing (5) is arranged outside the blades (3), and a distance between points on a blade tip cambered surface (6) and a bottom of the impeller hub (2) conforms to a logarithmic function y(A)=a-b*ln(r), wherein a is in a range of 0-0.5 mm, a is a gap between the blades (3) and an inner wall of the airflow-guiding housing (5) of the hairdryer, and r is a distance from a point on the blade tip cambered surface (6) to the central shaft (1).
  4. The high-speed high-pressure hairdryer impeller according to any of the preceding claims, characterized in that a curve of the impeller hub (2) is a Bezier curve, and an angle α between the curve of the impeller hub (2) and a horizontal plane is 30-60°.
  5. The high-speed high-pressure hairdryer impeller according to any of the preceding claims, characterized in that an angle β between the blade tip contour of the blade (3) and the horizontal plane is 20-50°.
  6. The high-speed high-pressure hairdryer impeller according to any of the preceding claims, characterized in that the first blade surface is a curved surface, an angle δ between the first blade surface and a vertical plane is gradually decreasing from the leading edge to the trailing edge of the first blade surface, with a value of (80-10° ).
  7. The high-speed high-pressure hairdryer impeller according to any of the preceding claims, characterized in that an inlet diameter D1 of the impeller is the diameter of the maximum circle formed by its leading edge rotating around the axis, a outlet diameter D2 of the impeller is the diameter of the maximum circle formed by its trailing edge rotating around the axis, a outlet diameter D3 of the airflow-guiding housing (5) is the diameter of its maximum air outlet cross-section, where D1/D2 as a ratio between D1 and D2 is in a range of 0.4-0.75, and D2/D3 as a ratio between D2 and D3 is in a range of 0.7-0.9.
  8. The high-speed high-pressure hairdryer impeller according to any of the preceding claims, characterized in that an outlet area of the blades (3) is greater than an inlet area, and S2/S1>1, wherein S1 denotes the inlet area of the blades (3) and S2 denotes the outlet area of the blades (3).
  9. The high-speed high-pressure hairdryer impeller according to any of the preceding claims, characterized in that curved leading edge surfaces of the blades (3) are all below an upper end surface of the impeller hub (2), and along the axial direction, a leading edge blade tip of the blade (3) is slightly higher than a blade root thereof.
  10. The high-speed high-pressure hairdryer impeller according to any of the preceding claims, characterized in that an angle θ1 formed between a leading edge contour of the blade (3) and a rotational axis of the impeller is in a range of 70-90°.
  11. The high-speed high-pressure hairdryer impeller according to any one of claims 1-10, characterized in that a wrap angle ω1 of a blade root portion of the impeller is within a first preset range, and a wrap angle ω2 of a blade tip portion is within a second preset range, where 60° ≤ ω2 < ω1 ≤ 90°.
  12. The high-speed high-pressure hairdryer impeller according to any one of claims 1-11, characterized in that an angle θ2 formed between a trailing edge contour of the blade (3) and the rotational axis of the impeller is in a range of 20-60°.
  13. A motor of the high-speed high-pressure hairdryer impeller according to any of the preceding claims, characterized in that the motor (4) employs a two-stage pressure-boosting guide vane design, a rotor of the motor (4) is of a single-bar structure, a lower side of the central shaft (1) is fixedly mounted on an output shaft of the motor (4), and the airflow-guiding housing (5) is fixedly mounted on an upper side of the motor (4).

Description

The present invention relates to the technical field of hairdryers, and specifically relates to a high-speed high-pressure hairdryer motor and impeller. A high-speed hairdryer is a novel hairdryer that mainly relies on a motor to provide a powerful driving force, and a rotational speed of the motor usually exceeds 100,000 rpm. The motor drives a rotor to rotate blades, air is sucked from an air inlet when the blades rotate, and a resultant discharged airflow is then blown out through a front nozzle of a barrel of the hairdryer. As a result, a high-speed forceful airflow is generated, and the high-speed airflow rapidly blows away moisture from hair, thereby achieving the purpose of air drying. In contrast, a traditional hairdryer mainly relies on high temperatures to dry hair, and therefore the blades of the hairdryer are particularly important. The Chinese patent CN214711022U discloses a hairdryer blade, including a central shaft. An impeller hub is sleeved outside the central shaft, blades are arranged outside the impeller hub, an air outlet cutting plane is arranged on one side of each of the blades, and an air inlet cutting plane is arranged on the other side thereof, where the air inlet cutting plane and the air outlet cutting plane are parallel to each other in a top view direction. The number of the blades is six, and the air inlet cutting plane and the air outlet cutting plane are in a parabolic shape and high in middles and low at both ends. An extended line of the air inlet cutting plane in the top view direction intersects the impeller hub at a point C, the point C is connected to a central axis, a connecting line is denoted as B, and the connecting line B forms an angle β together with the extended line of the air inlet cutting plane in the top view direction. Designs that the air inlet cutting plane and the air outlet cutting plane of each of the blades are parallel to each other in the top view direction and the air inlet cutting plane and the air outlet cutting plane are in the parabolic shape significantly enhance overall airflow performance of the hairdryer. However, the technical solution of the patent has the following defects: 1. The designs that the air inlet cutting plane and the air outlet cutting plane of each of the blades are parallel to each other in the top view direction and the air inlet cutting plane and the air outlet cutting plane are in the parabolic shape enhance the overall airflow performance of the hairdryer, but a current-carrying cross-sectional area is restricted by a core size of the central shaft during high-speed blowing, such that airflow velocity cannot be continuously enhanced by increasing the rotational speed. To solve the above problems, those skilled in the art provide a high-speed high-pressure hairdryer motor and impeller. An objective of the present invention is to provide a high-speed high-pressure hairdryer motor and impeller, so as to at least partially solve the problems mentioned in the above background art. To achieve the above objective, the present invention provides an impellor and a motor according to the independent claims. Embodiments thereof are specified in the dependent claims and the subsequent disclosure. Dependencies of the dependent claims does not limit the combination of features listed in the claims or the specification. To achieve the above objective, the present invention provides the following technical solution: a high-speed high-pressure hairdryer (motor and) impeller, including a central shaft and a motor, the central shaft is the rotational axis of the impeller, where an impeller hub is fixedly mounted on an upper side of the central shaft, a plurality of blades are fixedly mounted on an external side of the impeller hub, and both leading and trailing edges of the impeller hub are linear. Further, a blade surface may be formed by a blade tip contour and a blade root contour of the blade is defined as a first blade surface, and the first blade surface is characterized by a straight transition, which facilitates 5-axis CNC machining and improves machining efficiency. Furthermore, an airflow-guiding housing may be arranged outside the blades, and a distance between points on a blade tip cambered surface and a bottom of the impeller hub conforms to a logarithmic function y(A)=a-b*ln(r), where a is in a range of 0-0.5 mm, a is a gap between the blades and an inner wall of the airflow-guiding housing of the hairdryer, and r is a distance from a point on the blade tip cambered surface to a rotational axis. Furthermore, a curve of the impeller hub may be a Bezier curve, and an angle α between the curve of the impeller hub and a horizontal plane is 30-60°. Furthermore, an angle β between the blade tip contour of the blade and the horizontal plane may be 20-50°. Furthermore, the first blade surface may a curved surface, an angle δ between the first blade surface and a vertical plane is gradually decreasing from the leading edge to the t