A blade locking structure

Abstract

The present invention relates to a blade locking structure, including a blade handle, a hub, a locking nut, an inner tapered sleeve, a first outer tapered sleeve and a second outer tapered sleeve; the hub is provided with a handle mounting groove, the handle mounting groove is a stepped groove, the stepped groove is formed into three sections, namely, upper, middle and lower sections, and gradually widens from bottom to top; the locking nut is arranged between the blade handle and the upper section of the stepped groove, and the outer thread of the locking nut is matched with the inner thread of the upper section of the stepped groove, and the end face of the locking nut is against the inner tapered sleeve; when the locking nut rotates and pushes the inner tapered sleeve to move circumferentially, the first outer tapered sleeve and the second outer tapered sleeve are clamped to the blade handle through the matching of the conical surfaces. The present invention realizes locking by using two half outer tapered sleeves and one inner tapered sleeve through a locking nut, and has a blade structure realizing accurate positioning, flexible angle adjustment and reliable locking.

Description

Technical Field

[0001] The invention relates to the field of blade locking structure design, and in particular to a blade locking structure. Background Art

[0002] Test fans are mainly used in colleges and universities, scientific research institutes and large and medium-sized scientific research and production enterprises. They are installed in standard test air ducts to test and analyze the designed product models. Based on the test data, the performance of the product is obtained through similar conversion, and the degree of consistency with the design parameters is verified to determine whether the design requirements are met. The test items are mostly automobile appearance, wind turbine airfoils and aviation propeller blade airfoils. The test fan simulates the airflow under real working conditions to analyze the flow field and force conditions when the airflow flows through the test airfoil. The test fan must adapt to the operation of various working conditions, such as speed, temperature, etc. Therefore, the structure should have sufficient rigidity, strength and weather resistance, and should also be easy to install, maintain and adjust the angle.

[0003] With the rapid development of science and technology in my country in recent years, new airfoils have emerged continuously, and each airfoil needs to be tested to verify, so the test tasks are busy. For this reason, we designed a blade locking mechanism that is reliable in locking and easy to adjust the angle. Summary of the invention

[0004] Purpose of the invention: The purpose of the invention is to achieve accurate blade positioning, flexible adjustment of the working installation angle, high weather resistance, and provide reliable locking force for different working speeds and working conditions.

[0005] Technical solution: A blade locking structure, including a blade handle, a hub, a locking nut, an inner tapered sleeve, a first outer tapered sleeve and a second outer tapered sleeve;

[0006] The wheel hub is provided with a petiole mounting groove, which is a stepped groove, and the stepped groove is formed into three sections: upper, middle and lower sections, and gradually widens from bottom to top;

[0007] The blade handle is clearance-matched with the lower section of the stepped groove, the inner cone sleeve is arranged between the blade handle and the middle section of the stepped groove, and the first outer cone sleeve and the second outer cone sleeve are both sandwiched between the blade handle and the inner cone sleeve;

[0008] The first outer cone sleeve and the second outer cone are both bearing structures, the first outer cone sleeve and the second outer cone sleeve both have outer cone surfaces, the inner cone sleeve has an inner cone surface, and the inner cone surface of the inner cone sleeve is in a matching relationship with the outer cone surfaces of the first outer cone sleeve and the second outer cone sleeve;

[0009] The locking nut is arranged between the blade shank and the upper section of the stepped groove, and the external thread of the locking nut cooperates with the internal thread of the upper section of the stepped groove, and the end face of the locking nut abuts against the inner tapered sleeve; when the locking nut rotates and pushes the inner tapered sleeve to move circumferentially, the first outer tapered sleeve and the second outer tapered sleeve are clamped to the blade shank through the tapered surface cooperation.

[0010] Furthermore, the other end of the locking nut is located outside the upper section, and a positioning socket is opened on the outer wall of the other end of the locking nut. The blade locking structure also includes an insert, one end of which is fixed to the hub, and the other end is inserted into the socket for limiting position.

[0011] Furthermore, a positioning axial groove is formed on the step surface of the lower section of the stepped groove, and the first outer cone sleeve or the second outer cone sleeve is axially extended to form a positioning convex head, and the positioning convex head is matched with the positioning axial groove in shape.

[0012] Furthermore, at least two positioning axial grooves are formed on the step surface of the lower section of the stepped groove, and the first outer cone sleeve and the second outer cone sleeve extend axially to form positioning convex heads, and the positioning convex heads match the shape of the positioning axial grooves.

[0013] Furthermore, the inner cone angle of the inner cone sleeve is 5° to 20°.

[0014] Furthermore, the blade petiole is a stepped shaft.

[0015] Furthermore, the inner cone sleeve extends from the middle section of the stepped groove to the upper section of the stepped groove.

[0016] Furthermore, the inner wall surface of the locking nut forms an annular platform, and the annular platform abuts against the inner conical sleeve.

[0017] Technical effect: The present invention adopts two semi-outer tapered sleeves and one inner tapered sleeve to achieve locking through a locking nut, and has a method for realizing a blade structure with accurate positioning, flexible angle adjustment and reliable locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the explosion structure;

[0020] Figure 3 It is a structural schematic diagram of an embodiment;

[0021] Among them: 1-wheel hub, 2-locking nut, 3-inner tapered sleeve, 4-first outer tapered sleeve, 5-second outer tapered sleeve, 6-insert, 7-blade petiole. DETAILED DESCRIPTION

[0022] In conjunction with the accompanying drawings, a blade locking structure is specifically provided, including a blade handle, a hub, a locking nut, an inner tapered sleeve, a first outer tapered sleeve, and a second outer tapered sleeve;

[0023] The wheel hub is provided with a petiole mounting groove, which is a stepped groove, and the stepped groove is formed into three sections: upper, middle and lower sections, and gradually widens from bottom to top;

[0024] The blade handle is clearance-matched with the lower section of the stepped groove, the inner cone sleeve is arranged between the blade handle and the middle section of the stepped groove, and the first outer cone sleeve and the second outer cone sleeve are both sandwiched between the blade handle and the inner cone sleeve;

[0025] The first outer cone sleeve and the second outer cone are both bearing structures, the first outer cone sleeve and the second outer cone sleeve both have outer cone surfaces, the inner cone sleeve has an inner cone surface, and the inner cone surface of the inner cone sleeve is in a matching relationship with the outer cone surfaces of the first outer cone sleeve and the second outer cone sleeve;

[0026] The locking nut is arranged between the blade shank and the upper section of the stepped groove, and the external thread of the locking nut cooperates with the internal thread of the upper section of the stepped groove, and the end face of the locking nut abuts against the inner tapered sleeve; when the locking nut rotates and pushes the inner tapered sleeve to move circumferentially, the first outer tapered sleeve and the second outer tapered sleeve are clamped to the blade shank through the tapered surface cooperation.

[0027] The other end of the locking nut is located outside the upper section, and a positioning socket is opened on the outer wall of the other end of the locking nut. The blade locking structure also includes an insert, one end of the insert is fixed to the hub, and the other end is inserted into the socket for limiting position.

[0028] A positioning axial groove is formed on the step surface of the lower section of the stepped groove, and the first outer cone sleeve is axially extended to form a positioning convex head, and the positioning convex head is matched with the positioning axial groove in shape.

[0029] The inner cone angle of the inner cone sleeve is 10°.

[0030] The blade petiole is a stepped shaft.

[0031] The inner cone sleeve extends from the middle section of the stepped groove to the upper section of the stepped groove.

[0032] The inner wall surface of the locking nut forms an annular platform, and the annular platform abuts against the inner cone sleeve.

Claims

1. A blade locking structure, characterized in that: It includes a blade handle, a wheel hub, a locking nut, an inner taper sleeve, a first outer taper sleeve and a second outer taper sleeve; The wheel hub is provided with a petiole mounting groove, which is a stepped groove, and the stepped groove is formed into three sections: upper, middle and lower sections, and gradually widens from bottom to top; The blade handle is clearance-matched with the lower section of the stepped groove, the inner cone sleeve is arranged between the blade handle and the middle section of the stepped groove, and the first outer cone sleeve and the second outer cone sleeve are both sandwiched between the blade handle and the inner cone sleeve; The first outer cone sleeve and the second outer cone are both bearing structures, the first outer cone sleeve and the second outer cone sleeve both have outer cone surfaces, the inner cone sleeve has an inner cone surface, and the inner cone surface of the inner cone sleeve is in a matching relationship with the outer cone surfaces of the first outer cone sleeve and the second outer cone sleeve; The locking nut is arranged between the blade handle and the upper section of the stepped groove, and the outer thread of the locking nut cooperates with the inner thread of the upper section of the stepped groove, and the end face of the locking nut abuts against the inner tapered sleeve; when the locking nut rotates and pushes the inner tapered sleeve to move circumferentially, the first outer tapered sleeve and the second outer tapered sleeve are clamped to the blade handle through the cooperation of the conical surfaces; The other end of the locking nut is located outside the upper section, and a positioning socket is opened on the outer wall of the other end of the locking nut. The blade locking structure also includes an insert, one end of which is fixed to the propeller hub, and the other end is inserted into the socket for limiting position. The inner cone angle of the inner cone sleeve is 5° to 20°; The inner cone sleeve extends from the middle section of the stepped groove to the upper section of the stepped groove; The inner wall surface of the locking nut forms an annular platform, and the annular platform abuts against the inner cone sleeve.

2. A blade locking structure according to claim 1, characterized in that: A positioning axial groove is formed on the step surface of the lower section of the stepped groove, and the first outer cone sleeve or the second outer cone sleeve is axially extended to form a positioning convex head, and the positioning convex head is matched with the positioning axial groove in shape.

3. A blade locking structure according to claim 1 or 2, characterized in that: At least two positioning axial grooves are formed on the step surface of the lower section of the stepped groove, and the first outer cone sleeve and the second outer cone sleeve extend axially to form positioning convex heads, and the positioning convex heads match the shape of the positioning axial grooves.

4. A blade locking structure according to claim 1 or 2, characterized in that: The blade petiole is a stepped shaft.

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