A lift fan rotor wheel disc and its blade structure

Abstract

The application belongs to the technical field of lift fan rotor wheel disc and its blade structure design, and particularly relates to a lift fan rotor wheel disc and its blade structure, which comprises: a rotor wheel disc, which is provided with a plurality of groups of ventilation holes on the outer edge; a plurality of rotor blades, which are welded at the root portions to the outer edge of the rotor wheel disc and are distributed in the circumferential direction of the rotor wheel disc; each rotor blade is provided with a plurality of hollow grooves, and each hollow groove is distributed in the radial direction of the rotor blade; the hollow grooves located at the leading edge portions of each rotor blade are communicated with each group of ventilation holes, and the hollow grooves behind the leading edge portions extend to the blade tip portions of the rotor blade.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of lift fan rotor wheel disc and its blade structure design, and particularly relates to a lift fan rotor wheel disc and its blade structure. BACKGROUND

[0002] The lift fan is an important component of a short-distance vertical take-off and landing engine, which is used to provide front lift for a short-distance vertical take-off and landing aircraft and only works when the aircraft takes off and lands. Under normal circumstances, the lift fan becomes dead weight of the aircraft, which affects the endurance of the aircraft.

[0003] At present, in the lift fan, the rotor wheel disc and the blade are connected through a tenon, which increases the extra weight and generates a large centrifugal load, and has a high requirement on the carrying capacity of the rotor wheel disc. Generally, the rotor wheel disc needs to have a large mass, which is not conducive to the weight control of the lift fan.

[0004] The present application is proposed in view of the above technical defects.

[0005] It should be noted that the disclosure of the above background art is only used to assist in understanding the inventive concept and technical solutions of the present application, and it does not necessarily belong to the prior art of the present application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. SUMMARY

[0006] The purpose of the present application is to provide a lift fan rotor wheel disc and its blade structure to overcome or alleviate at least one aspect of the known technical defects.

[0007] The technical solution of the present application is:

[0008] A lift fan rotor wheel disc and its blade structure, comprising:

[0009] A rotor wheel disc having a plurality of groups of ventilation holes on the outer edge thereof;

[0010] A plurality of rotor blades welded at the root portions thereof to the outer edge of the rotor wheel disc and distributed circumferentially along the rotor wheel disc;

[0011] Each rotor blade has a plurality of hollow grooves therein, and each hollow groove is distributed radially along the rotor blade;

[0012] The hollow grooves located at the leading edge portions of each rotor blade are in communication with each group of ventilation holes, and the hollow grooves after the leading edge portions extend to the tip portions of the rotor blade.

[0013] According to at least one embodiment of the present application, in the above-mentioned lift fan rotor wheel disc and its blade structure, the rotor wheel disc is of a single-spoke or double-spoke configuration.

[0014] According to at least one embodiment of the present application, the lift fan rotor wheel disc and the blade structure thereof described above, the outer edge of the rotor wheel disc has a plurality of bosses;

[0015] Each boss is distributed circumferentially along the rotor wheel disc and is welded with the root of each rotor blade.

[0016] According to at least one embodiment of the present application, the lift fan rotor wheel disc and the blade structure thereof described above, each rotor blade is welded by two halves, and a plurality of hollow grooves are formed between the two halves.

[0017] The present application has at least the following beneficial technical effects:

[0018] The present application provides a lift fan rotor wheel disc and a blade structure thereof, each rotor blade is directly connected with the rotor wheel disc by welding, and the tenon-related structure is cancelled, and each rotor blade has a plurality of hollow grooves, which has a lighter mass, can reduce the centrifugal load, and can reduce the requirement for the carrying capacity of the rotor wheel disc, the rotor wheel disc has a relatively small mass, thereby reducing the mass of the lift fan as a whole, and promoting the improvement of the endurance of the aircraft. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is a schematic diagram of the lift fan rotor wheel disc and the blade structure thereof provided by the present application;

[0020] Fig. 2 is a partial cross-sectional view of the lift fan rotor wheel disc and the blade structure thereof provided by the present application;

[0021] Fig. 3 is a schematic diagram of the welding of the two halves of the rotor blade provided by the present application;

[0022] Among them:

[0023] 1-rotor wheel disc; 2-rotor blade.

[0024] In order to better illustrate the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual size of the product, and in addition, the drawings are only used for illustrative description and cannot be understood as a limitation of the present application. DETAILED DESCRIPTION

[0025] In order to make the technical solutions of the present application and the advantages thereof clearer, the technical solutions of the present application will be further clearly and completely described below in conjunction with the drawings. It should be understood that the specific embodiments described herein are only partial embodiments of the present application, and are only used to explain the present application, but not to limit the present application. It should be noted that, for the purpose of description, only parts related to the present application are shown in the drawings, and other related parts can be referred to the general design. In the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined to obtain new embodiments.

[0026] In addition, unless otherwise defined, the technical terms or scientific terms used in the present application description should be the general meanings understood by the general technical personnel in the field of the present application. The words indicating the direction or position relationship such as "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer" and the like used in the present application description are only used to indicate the relative direction or position relationship, but not to imply that the device or element must have a specific direction, be constructed and operated in a specific direction, and the relative position relationship may also change accordingly when the absolute position of the described object changes, therefore it cannot be understood as a limitation on the present application. The "first", "second", "third" and the like used in the present application description are only for the purpose of description, to distinguish different components, and cannot be understood as indicating or implying relative importance. The "one", "an" or "the" and the like used in the present application description should not be understood as an absolute limitation on the quantity, but should be understood as the existence of at least one. The "including" or "containing" and the like used in the present application description means that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, and do not exclude other elements or objects.

[0027] In addition, it should also be noted that, unless otherwise specified and limited, the "mounting", "connection", "connection" and the like used in the present application description should be understood in a broad sense, for example, the connection can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements, and the person skilled in the art can understand the specific meaning of the present application according to the specific circumstances.

[0028] The technical solutions of the present application will be further described below in conjunction with the drawings Figs. 1 to 3 The present application will be further described below.

[0029] A lift fan rotor wheel disc and the blade structure thereof, comprising:

[0030] A rotor wheel disc 1 has a plurality of groups of ventilation holes, each group of ventilation holes can be formed on the outer edge of the rotor wheel disc 1 and distributed circumferentially along the rotor wheel disc 1 and directed to the disc center of the rotor wheel disc 1;

[0031] A plurality of rotor blades 2 are welded at the root to the outer edge of the rotor wheel disc 1, and can be electron beam welded, and are distributed circumferentially along the rotor wheel disc 1;

[0032] Each rotor blade 2 has a plurality of hollow grooves, and each hollow groove is distributed radially along the rotor blade 2;

[0033] The hollow grooves located at the leading edge of each rotor blade 2 are connected to each group of ventilation holes, and the hollow grooves after the leading edge extend to the tip of the rotor blade 2.

[0034] For the above-mentioned embodiment of the lift fan rotor wheel disc and the blade structure, those skilled in the art can understand that the direct welding connection between each rotor blade 2 and the rotor wheel disc 1 is designed, and the tenon related structure is cancelled, and each rotor blade 2 has a plurality of hollow grooves, which has a lighter mass, can reduce the centrifugal load, and can reduce the requirement for the carrying capacity of the rotor wheel disc 1, and the rotor wheel disc 1 has a relatively small mass, so that the mass of the lift fan can be reduced as a whole, and the endurance of the aircraft can be improved.

[0035] For the above-mentioned embodiment of the lift fan rotor wheel disc and the blade structure, those skilled in the art can understand that the hollow grooves located at the leading edge of each rotor blade 2 are connected to each group of ventilation holes on the outer edge of the rotor wheel disc 1, and the hollow grooves after the leading edge extend to the tip of the rotor blade 2, so that each hollow groove can be connected to the external environment, and the different expansion of air in each hollow groove caused by temperature change during the operation of the lift fan can be avoided, and the temperature alternating load on the side wall of the rotor blade 2 can be avoided, and fatigue damage can be avoided.

[0036] For the above-mentioned embodiment of the lift fan rotor wheel disc and the blade structure, those skilled in the art can understand that in order to ensure the aerodynamic efficiency, the leading edge of each rotor blade 2 is usually thin and has vibration and sound, and the hollow grooves located at the leading edge of each rotor blade 2 are connected to each group of ventilation holes on the outer edge of the rotor wheel disc 1, on the one hand, the hollow grooves located at the leading edge of each rotor blade 2 are connected to the external environment through the root, and the strength of the rotor blade 2 can be ensured, and on the other hand, when the leading edge of each rotor blade 2 vibrates, the deformation of the rotor blade 2 will squeeze the air in the hollow groove located at the leading edge, and the suction effect between the air in the hollow groove and the air in the disc center of the rotor wheel disc 1 can dissipate the vibration energy, and has a damping inhibition effect on the vibration of the leading edge of the rotor blade 2.

[0037] In some alternative embodiments, the lift fan rotor wheel disc and the blade structure thereof described above, the rotor wheel disc 1 is in a single-spoke or double-spoke configuration.

[0038] In some alternative embodiments, the lift fan rotor wheel disc and the blade structure thereof described above, the outer edge of the rotor wheel disc 1 has a plurality of bosses; each boss is circumferentially distributed along the rotor wheel disc 1 and is welded to the root of each rotor blade 2, facilitating the welding between each rotor blade 2 and the rotor wheel disc 1.

[0039] In some alternative embodiments, the lift fan rotor wheel disc and the blade structure thereof described above, each rotor blade 2 is welded from two halves, which can be electron beam welded, and a plurality of hollow grooves are formed between the two halves, facilitating the machining and manufacturing.

[0040] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between each embodiment can be mutually referred to.

[0041] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings. Those skilled in the art should understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without deviating from the principles of the present application, those skilled in the art can make equivalent changes or replacements to the related technical features, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A lift fan rotor wheel disk and its blade structure, characterized by, The application relates to a lift fan rotor disc and blade structure. The rotor disc (1) has a plurality of groups of ventilation holes on the outer edge; A plurality of rotor blades (2) are welded at the roots on the outer edge of the rotor disc (1) and are distributed along the circumference of the rotor disc (1); Each rotor blade (2) has a plurality of hollow grooves, and each hollow groove is distributed along the radial direction of the rotor blade (2); The hollow groove at the leading edge of each rotor blade (2) is connected with each group of ventilation holes, and the hollow groove behind the leading edge extends to the blade tip of the rotor blade (2), so that each hollow groove can be connected with the external environment; Each rotor blade (2) is welded by two halves, and the two halves form a plurality of hollow grooves; When the leading edge of each rotor blade (2) vibrates, the rotor blade (2) is deformed to extrude air in the hollow groove at the leading edge, the air in the hollow groove and the air in the disc core of the rotor disc (1) are sucked, vibration energy is dissipated, and the leading edge vibration of the rotor blade (2) is damped and inhibited.

2. The lift fan rotor disc and blade structure according to claim 1, characterized in that The rotor disc (1) is in a single-spoke or double-spoke configuration.

3. The lift fan rotor disc and blade structure according to claim 1, characterized in that The rotor disc (1) has a plurality of bosses on the outer edge; Each boss is distributed along the circumference of the rotor disc (1) and is welded at the root of each rotor blade (2).

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