CN216767822U - Blade for transformer cooling fan - Google Patents

Abstract

The utility model provides a blade for a transformer cooling fan, which comprises a blade main body part and a blade handle part, wherein one side surface of the blade is inwards sunken and bent, the blade handle is arranged at one third of the edge of a blade root of the blade, and the blade rotates and extends from the blade root to a blade tip; wherein, the blade is an aluminum alloy integral die-casting structure. The blade for the transformer cooling fan can reduce gas separation, improve air cooling efficiency and reduce noise, is of an aluminum alloy integral die-casting structure, and has the characteristics of high strength, corrosion resistance, long service life, severe environment resistance and the like.

Description

Blade for transformer cooling fan

Technical Field

The utility model relates to the field of fans, in particular to a blade for a cooling fan of a transformer.

Background

At present, no manufacturer for producing a fan with the diameter of 1250mm for cooling a transformer exists in China, and the domestic requirements for low rotating speed, low noise and large-size fans (with the diameter of 1250 mm) are all dependent on import. And foreign fan product adopts the external rotor motor structure, and the blade is fixed on motor casing, is a whole with motor casing, needs whole the change after the motor breaks down, and the cost is high, and the maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is an object of the present invention to provide a blade for a transformer cooling fan, which overcomes the above problems or at least partially solves or alleviates the above problems.

The utility model provides a blade for a cooling fan of a transformer, which comprises: a blade having one side surface which is concavely curved inward, and a stem provided at one third of an edge of a blade root of the blade, the blade extending torsionally from the blade root to a blade tip; the blades are of an aluminum alloy integral die-casting forming structure.

The utility model also has the following optional features.

Optionally, the petiole is of a cylindrical structure, a longitudinal section is arranged on the petiole, a plurality of circumferential grooves are arranged on the arc surface of the petiole, and a protruding positioning block is arranged on the longitudinal section.

Optionally, the blade tapers in width from the blade root at the blade shank connection to the blade tip.

Optionally, the blade tapers in thickness from a blade root at the blade shank connection to a blade tip.

Optionally, the vanes taper in thickness from the upper edge to the lower edge.

Optionally, the curvature of the cross-section of the blade decreases from the root at the blade shank junction to the tip.

The blades for the transformer cooling fan are used for being connected to the impeller, the impeller is directly connected with the inner rotor motor, namely the impeller is fixed on a motor shaft, and the impeller only needs to be detached to replace the motor after the motor fails, so that the manufacturing cost is low, and the later maintenance cost is low; the blade can reduce gas separation, improve air cooling efficiency and reduce noise, is of an aluminum alloy integral die-casting structure, and has the characteristics of high strength, corrosion resistance, long service life, severe environment resistance and the like.

Drawings

FIG. 1 is a schematic view of a forward structure of a blade for a transformer cooling fan according to the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a cross-sectional view of FIG. 1 at A-A;

FIG. 5 is a cross-sectional view of FIG. 1 at B-B;

FIG. 6 is a cross-sectional view of FIG. 1 at C-C;

FIG. 7 is a cross-sectional view of FIG. 1 at D-D;

FIG. 8 is a cross-sectional view at E-E of FIG. 1;

FIG. 9 is a cross-sectional view at F-F of FIG. 1;

FIG. 10 is a cross-sectional view of FIG. 1 at G-G;

FIG. 11 is a front view of an impeller comprising blades for a transformer cooling fan according to the present invention;

fig. 12 is a schematic view of the full-section structure of fig. 11.

In the above figures: 1, a blade; 2, petiole; 201 longitudinal section; 202 circumferential grooves; 203, protruding a positioning block; a 3U-shaped bolt; 4 wheel disk.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Detailed Description

Example 1

Referring to fig. 1, 2 and 3, an embodiment of the present invention provides a blade for a transformer cooling fan, including: a blade 1 and a blade handle 2, wherein one side surface of the blade 1 is inwards concave and bent, the blade handle 2 is arranged at one third of the edge of the blade root of the blade 1, and the blade 1 is twisted and extended from the blade root to the blade tip; the blade 1 and the blade handle 2 are of an aluminum alloy integral die-casting structure.

The fan for cooling the transformer of the fan has the advantages of low requirement on full pressure, simple structure and easy installation, so that the impeller adopts a single impeller stage, and the blades 1 in the impeller are of an airfoil-shaped structure, namely similar to the shape of airplane blades, and have the advantages of good aerodynamic characteristics, high efficiency, good strength and high rigidity. As shown in FIG. 1, the total length of the blade 1 and the blade shank 2 is 554.7mm, the length of the blade 1 is 500mm, the diameter of the blade shank 2 is 35mm, as shown in FIG. 2, the concavely curved side of the blade 1 faces the blowing direction while the blade 1 is rotationally extended from one end to the other end centering on the axial line of the blade shank 2, the distance from the tangent plane E-E of the blade 1 in FIG. 8 to the tangent plane F-F of the blade 1 in FIG. 9 is 28.7mm, the chord angle from the tangent plane E-E of the blade 1 in FIG. 8 is 123 degrees, the chord angle from the tangent plane F-F of the blade 1 in FIG. 9 is 117 degrees, so the E-E rotation angle is (123 degrees-117 degrees/(0.287 mm) 21 degrees/m.

Example 2

Referring to fig. 1, 3, 11 and 12, on the basis of embodiment 1, the petiole 2 is a cylindrical structure, a longitudinal section 201 is provided on the petiole 2, a plurality of circumferential grooves 202 are provided on an arc surface of the petiole 2, and a protrusion positioning block 203 is provided on the longitudinal section 201.

The root of the blade 1 and the blade handle 2 are integrally cast and formed, the blade handle 2 is of a semi-cylindrical structure, the blade handle 2 is provided with two circumferential grooves 202 on the cambered surface, the circumferential grooves 202 on the cambered surface of the blade handle 2 are used for being matched with the U-shaped bolts 3 to fix the blade 1 on the wheel disc 4 of the impeller, a rectangular protruding positioning block 203 is arranged on a longitudinal tangent plane 201 of the blade handle 2, the protruding positioning block 203 is matched with a rectangular groove which is arranged in advance on the wheel disc 4 of the impeller, the sliding of the blade 1 relative to the diameter direction of the wheel disc 4 is limited, the blade 1 is also prevented from rotating along the axis circumference of the blade handle 2, and the deflection angle of the blade 1 is fixed.

Example 3

Referring to fig. 2 to 5, on the basis of embodiment 1, the width of the blade 1 from the blade root to the blade tip at the connection of the blade shank 2 is gradually reduced;

example 4

Referring to fig. 5 to 10, on the basis of embodiment 3, the thickness of the blade 1 gradually decreases from the end where the blade shank 2 is connected to the tip.

Example 5

Referring to fig. 5 to 10, on the basis of embodiment 1, the thickness of the blade 1 gradually decreases from the upper edge to the lower edge.

Example 6

Referring to fig. 3 to 10, on the basis of embodiment 1, the curvature of the cross section of the blade 1 gradually decreases from the end where the shanks 2 are connected to the tip.

The structural safety of the blade 1 can be ensured only when the design requires that the upper maximum stress of the blade 1 is positioned at the blade root and close to the center of the impeller.

The blade 1 and the blade handle 2 are easy to have the maximum structural stress at the root part, so the root parts of the blade handle 2 and the blade 1 adopt the large round chamfer angle treatment, the stress concentration at the root part of the blade 1 is reduced, and the stress distribution is more gentle.

The blade 1 is of a wing type, is thin and slender, the width of the blade 1 from a blade root at the joint of the blade handle 2 to a blade tip is gradually reduced, and a variable ring volume design principle is adopted, so that gas separation can be reduced, the efficiency is improved, and the noise is reduced. Under the condition that the strength of the blade 1 can be met, the thickness of the blade 1 from one end of the connecting part of the blade handles 2 to the tail end is gradually reduced, the thickness of the blade 1 from the upper edge to the lower edge is gradually reduced, and the weight of the blade 1 is reduced as much as possible.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.

Claims (6)

1. A blade for a cooling fan of a transformer, comprising: a blade (1) and a blade handle (2), wherein one side surface of the blade (1) is inwards concave and bent, the blade handle (2) is arranged at one third of the edge of the blade root of the blade (1), and the blade (1) is twisted and extended from the blade root to the blade tip; the blade (1) and the blade handle (2) are of an aluminum alloy integral die-casting structure.

2. The blade for the transformer cooling fan according to claim 1, wherein the blade handle (2) is a cylindrical structure, a longitudinal section (201) is arranged on the blade handle (2), a plurality of circumferential grooves (202) are arranged on the cambered surface of the blade handle (2), and a raised positioning block (203) is arranged on the longitudinal section (201).

3. Blade for a transformer cooling fan according to claim 1, characterized in that the width of the blade (1) tapers from the blade root where the blade shanks (2) are connected to the blade tip.

4. Blade for a transformer cooling fan according to claim 1, characterized in that the thickness of the blade (1) decreases from the blade root where the blade shanks (2) are connected to the blade tip.

5. Blade for a transformer cooling fan according to claim 1, characterized in that the thickness of the blade (1) decreases from the upper edge to the lower edge.

6. Blade for a transformer cooling fan according to claim 1, characterized in that the curvature of the cross-section of the blade (1) decreases from the blade root where the blade shanks (2) are connected to the blade tip.

Images