Centrifugal blower impeller for blade deicing and blower

Abstract

The centrifugal blower impeller comprises a wheel disc structure, the wheel disc structure comprises a first wheel disc and a second wheel disc, a blade cavity is defined by the first wheel disc and the second wheel disc, an impeller inlet is formed in one end of the blade cavity, an impeller outlet is formed in the other end of the blade cavity, and the width of the impeller outlet is larger than that of the impeller inlet; the first wheel disc and the second wheel disc form a wedge-shaped structure; and the multiple blades are contained in the blade cavities at intervals in the circumferential direction of the wheel disc structure, and the first wheel disc and the second wheel disc are connected with the blades. According to the centrifugal blower impeller, the first wheel disc and the second wheel disc are oppositely and obliquely arranged, the width of the impeller outlet is larger than that of the impeller inlet, a wedge-shaped structure is formed under the condition that the blades are connected between the first wheel disc and the second wheel disc, and the reliability of the centrifugal blower impeller for blade deicing can be enhanced; and the service life of the centrifugal blower impeller for blade deicing is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power blade deicing and disaster reduction, and in particular relates to a centrifugal blower impeller and a blower for blade deicing. Background Art

[0002] As my country's wind power installed capacity continues to expand, a large number of wind turbines are built in heavy icing areas, where wind turbine blades are prone to ice in winter. Blade ice will increase the load on the blades and wind turbine main shaft, change the blade airfoil, directly lead to a reduction in the life of related components and a decrease in expected output, seriously affecting the safe and reliable operation of the wind turbine system.

[0003] Gas heating deicing is one of the reliable ways to de-ice fan blades. The principle is to blow hot air into the inner cavity through the blower inside the blade, so as to heat the blade wall and achieve the purpose of de-icing. As a key component of gas heating de-icing equipment, the performance and reliability of the blower directly determine the de-icing effect in winter. However, the current blower cannot effectively adapt to the long-term constant centrifugal force in the fan blades, has low reliability, cannot meet the aerodynamic performance requirements of large air volume for gas heating de-icing, and has a short lifespan. Summary of the invention

[0004] The main purpose of the present invention is to provide a centrifugal blower impeller and a blower for blade deicing, so as to solve the technical problems of poor reliability and short life of the blower for blade deicing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a centrifugal blower impeller for deicing blades, the centrifugal blower impeller for deicing blades comprising: a wheel disc structure, comprising a first wheel disc and a second wheel disc, the first wheel disc and the second wheel disc forming a blade cavity, one end of the blade cavity is provided with an impeller inlet, and the other end is provided with an impeller outlet, the width of the impeller outlet is greater than the width of the impeller inlet, and the first wheel disc and the second wheel disc form a wedge-shaped structure; blades, a plurality of the blades are accommodated in the blade cavity at intervals along the circumference of the wheel disc structure, and the first wheel disc and the second wheel disc are both connected to the blades.

[0006] In an embodiment of the present invention, the first wheel disc and the second wheel disc are both welded to the side of the blade in the thickness direction, and a first weld is formed between the first wheel disc and the blade, and a second weld is formed between the second wheel disc and the blade, and the lengths of the first weld and the second weld match the length of the blade.

[0007] In an embodiment of the present invention, the width of the first weld and the second weld are both not less than 3 mm.

[0008] In an embodiment of the present invention, the corners of the blades are welded to the wheel disc structure via reinforced welds, and the diameter of the reinforced welds is not less than 5 mm.

[0009] In an embodiment of the present invention, an airflow outlet angle and an airflow inlet angle between the blades and the wheel disc structure are both greater than 90 degrees.

[0010] In an embodiment of the present invention, the blade is a straight plate type, and the airflow outlet angle is the same as the airflow inlet angle.

[0011] In the embodiment of the present invention, the wheel disc structure is integrally formed by a hot die casting process.

[0012] In an embodiment of the present invention, the wheel disc structure is made of aluminum alloy or stainless steel; and / or the blades are made of aluminum alloy or stainless steel.

[0013] In the embodiment of the present invention, the inlet diameter of the blade is D1, the impeller diameter of the wheel disc structure is D2, and D1>1 / 2D2.

[0014] The present invention also provides a centrifugal blower for blade deicing, wherein the centrifugal blower for blade deicing comprises the centrifugal blower impeller for blade deicing as described above.

[0015] Through the above technical solution, the centrifugal blower impeller for blade deicing provided by the embodiment of the present invention has the following beneficial effects: The first wheel disc is tilted relative to the second wheel disc along its own plate thickness direction, so that the first wheel disc and the second wheel disc form a wedge-shaped structure, the impeller inlet corresponds to the outer ring of the wheel disc structure, and the impeller outlet corresponds to the inner ring of the wheel disc structure, so that the width of the impeller inlet is greater than the width of the impeller outlet. Compared with the technical solution in the prior art with the same inlet and outlet widths, the connection strength between the blade and the wheel disc structure can be strengthened, the reliability of the centrifugal blower impeller used for blade deicing can be improved, and the service life of the centrifugal blower impeller used for blade deicing can be greatly extended. In the present invention, the first wheel disc and the second wheel disc are relatively tilted, so that the width of the impeller outlet is greater than the width of the impeller inlet, and a wedge-shaped structure is formed when the blade is connected between the first wheel disc and the second wheel disc, which can strengthen the reliability of the centrifugal blower impeller used for blade deicing and extend the service life of the centrifugal blower impeller used for blade deicing.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a schematic diagram of a cross-sectional structure of a centrifugal blower impeller for blade deicing at a certain viewing angle according to an embodiment of the present invention; Figure 2 is a schematic diagram of a cross-sectional structure of a centrifugal blower impeller for blade deicing in another embodiment of the present invention; Figure 3 1 is a schematic structural diagram of an impeller portion of a centrifugal blower for deicing blades according to another embodiment of the present invention.

[0018] Description of reference numerals: 100. Centrifugal blower impeller for blade deicing; 1. First roulette wheel; 2. Second roulette wheel; 3. Blade cavity; 31. Impeller inlet; 32. Impeller outlet; 4. Leaves; 5. First weld; 6. Strengthen solder joints. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] A centrifugal blower impeller for blade deicing according to the present invention will be described below with reference to the accompanying drawings.

[0021] like Figures 1 to 3 As shown, in an embodiment of the present invention, a centrifugal blower impeller 100 for blade deicing includes a wheel disc structure and blades 4, the wheel disc structure includes a first wheel disc 1 and a second wheel disc 2, the first wheel disc 1 and the second wheel disc 2 enclose a blade cavity 3, an impeller inlet 31 is provided at one end of the blade cavity 3, and an impeller outlet 32 ​​is provided at the other end, the width of the impeller outlet 32 ​​is greater than the width of the impeller inlet 31, and the first wheel disc 1 and the second wheel disc 2 form a wedge-shaped structure; a plurality of blades 4 are accommodated in the blade cavity 3 at intervals along the circumference of the wheel disc structure, and the first wheel disc 1 and the second wheel disc 2 are both connected to the blades 4.

[0022] like Figure 1As shown, the width b1 of the impeller outlet 32 ​​is greater than the width b2 of the impeller inlet 31, so that the first disc 1 and the second disc 2 of the disc structure form a wedge-shaped structure, which can strengthen the connection strength between the blades 4 and the disc structure, and the angle between any two adjacent blades 4 can be higher under the condition of the best efficiency working point. In addition, the first disc 1 and the second disc 2 are both hollow annular structures, and the impeller diameter D2 of the centrifugal blower impeller 100 for blade deicing is the outer ring diameter of the disc structure, and the inlet diameter of the blade 4 is the inner ring diameter D1 of the disc structure.

[0023] In this embodiment, the first wheel disc 1 is arranged obliquely relative to the second wheel disc 2 along its plate thickness direction, so that the first wheel disc 1 and the second wheel disc 2 form a wedge-shaped structure, the impeller inlet 31 is arranged corresponding to the outer ring of the wheel disc structure, and the impeller outlet 32 ​​is arranged corresponding to the inner ring of the wheel disc structure, so that the width of the impeller inlet 31 is greater than the width of the impeller outlet 32. Compared with the technical solution in the prior art in which the inlet and outlet widths are the same, the connection strength between the blades 4 and the wheel disc structure can be strengthened, the reliability of the centrifugal blower impeller 100 for blade deicing can be improved, and the service life of the centrifugal blower impeller 100 for blade deicing can be greatly extended. In this embodiment, the first wheel disc 1 and the second wheel disc 2 are arranged relatively obliquely, so that the width of the impeller outlet 32 ​​is greater than the width of the impeller inlet 31. When the blades 4 are connected between the first wheel disc 1 and the second wheel disc 2, a wedge-shaped structure is formed, which can strengthen the reliability of the centrifugal blower impeller 100 for blade deicing and extend the service life of the centrifugal blower impeller 100 for blade deicing.

[0024] In one embodiment, the first wheel disc 1 and the second wheel disc 2 are welded to the side of the blade 4 in the thickness direction, and a first weld 5 is formed between the first wheel disc 1 and the blade 4, and a second weld is formed between the second wheel disc 2 and the blade 4. The lengths of the first weld 5 and the second weld match the length of the blade 4. Figure 3 As shown, the sides of the blades 4 in the thickness direction are welded to the wheel disc structure by arc welding technology, and the gaps at the joints are fully welded on both sides. Compared with the partial welding and partial riveting connection method in the prior art, the centrifugal blower impeller 100 used for blade deicing can meet the requirements of long-term constant centrifugal force and low-frequency and high-amplitude vibration. The speed can achieve 2950r / min.

[0025] It should be noted that the width of the first weld 5 and the second weld is not less than 3 mm. The weld surfaces of the first weld 5 and the second weld are smooth and flat, and there are no defects such as cracks, unfused, slag inclusions, pores, etc. on the smooth and flat surfaces. The smooth and flat surfaces of the first weld 5 and the second weld can ensure the connection strength between the first wheel disc 1, the second wheel disc 2 and the blade 4. The first wheel disc 1 and the second wheel disc 2 are arranged at the upper and lower ends of the blade 4 along the height direction of the blade 4. The inner ring and the outer ring of the wheel disc structure are arranged at intervals along the length direction of the blade 4.

[0026] Specifically, the corners of the blades 4 are welded to the wheel disc structure via a reinforcement weld 6, and the diameter of the reinforcement weld 6 is not less than 5 mm. Figure 3 As shown, the bottom of the blade 4 is provided with four corners, and the top is provided with four corners. The corners at the bottom and the top are welded to the wheel disc structure by reinforcing welding points 6, and the four corners on both sides of the connection are welded by tungsten inert gas arc welding. The welding points of the reinforcing welding points 6 are smooth and flat surfaces, and there are no defects such as cracks, unfused, slag inclusions, pores, etc. on the surface; the centrifugal blower impeller 100 used for blade deicing can meet the requirements of long-term constant centrifugal force, low-frequency and high-amplitude vibration, and can achieve a speed of 2950r / min. In this embodiment, by strengthening the cooperation of the welding points 6, the first weld 5 and the second weld, the blade 4 can be reliably welded to the wheel disc structure, greatly improving the reliability of the centrifugal blower impeller 100 used for blade deicing. The number of reinforcing welding points 6 at each corner can be set according to actual use requirements. In one embodiment, a reinforcing welding point 6 is set at each corner.

[0027] like Figure 2 As shown, in one embodiment, the airflow outlet angle β1 and the airflow inlet angle β2 between the blade 4 and the disc structure are both greater than 90 degrees, the blade 4 is a straight plate type, and the airflow outlet angle is the same as the airflow inlet angle. Under the requirement of aerodynamic performance, the centrifugal blower impeller 100 used for blade deicing has no complex special-shaped structure, is easy to process, and has the characteristics of easy processing and strong reliability. The centrifugal blower impeller 100 used for blade deicing meets the required air volume and air pressure requirements, has good aerodynamic performance, and can achieve relatively high efficiency and air volume. In an embodiment of the present invention, the disc structure is integrally formed by a hot die casting process, which can enhance the integrity of the centrifugal blower impeller 100 used for blade deicing.

[0028] It should be noted that the wheel disc structure is made of aluminum alloy or stainless steel; and the blades 4 are made of aluminum alloy or stainless steel. When the wheel disc structure and the blades 4 are made of aluminum alloy plates, the minimum plate thickness of the aluminum alloy plates is not less than 3 mm, and when the wheel disc structure and the blades 4 are made of stainless steel plates, the minimum plate thickness of the stainless steel plates is not less than 2 mm, which can ensure that the centrifugal blower impeller 100 used for blade deicing is light and strong at the same time.

[0029] In the embodiment of the present invention, the inlet diameter of the blade 4 is D1, and the impeller diameter of the wheel disc structure is D2, and D1>1 / 2D2. The centrifugal blower impeller 100 for blade deicing is used for deicing the blades 4 of a wind turbine generator. The three size restrictions of the generator nacelle, the hub, and the manhole size of the blade 4 can be obtained, and the minimum size of the three size restrictions is selected as the maximum diameter that can be passed through the centrifugal blower impeller 100 for blade deicing, that is, the impeller diameter D2. The impeller diameter D2 of the centrifugal blower impeller 100 for blade deicing is the outer ring diameter of the wheel disc structure, and the inlet diameter of the blade 4 is the inner ring diameter D1 of the wheel disc structure, and D1>1 / 2D2, which can ensure the connection strength and aerodynamic performance. Compared with the general centrifugal fan impeller, the centrifugal blower impeller 100 for blade deicing in this embodiment fully considers the actual installation conditions and operating conditions of the wind power blade deicing blower, and has high reliability and long service life under the premise of ensuring the aerodynamic performance requirements.

[0030] like Figure 3 As shown, 12 blades 4 are arranged at intervals along the circumference of the disk structure, and any two adjacent blades 4 form an angle with each other. The outer end of the blade 4 is close to the outer ring edge of the disk structure, and the inner end of the blade 4 is close to the inner ring edge of the disk structure.

[0031] The present invention further provides a centrifugal blower for deicing blades 4, the centrifugal blower for deicing blades 4 comprises the centrifugal blower impeller 100 for deicing blades as described above, and the specific structure of the centrifugal blower impeller 100 for deicing blades is referred to the above embodiment. Since the centrifugal blower for deicing blades 4 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0032] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0035] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A centrifugal blower impeller for blade deicing, characterized in that: The centrifugal blower impeller (100) for blade deicing comprises: A wheel disc structure, comprising a first wheel disc (1) and a second wheel disc (2), wherein the first wheel disc (1) and the second wheel disc (2) enclose a blade cavity (3), one end of the blade cavity (3) is provided with an impeller inlet (31), and the other end is provided with an impeller outlet (32), the width of the impeller outlet (32) is greater than the width of the impeller inlet (31), and the first wheel disc (1) and the second wheel disc (2) form a wedge-shaped structure; Blades (4), a plurality of blades (4) are accommodated in the blade cavity (3) at intervals along the circumference of the wheel disc structure, and the first wheel disc (1) and the second wheel disc (2) are both connected to the blades (4).

2. The centrifugal blower impeller for blade deicing according to claim 1, characterized in that: The first wheel disc (1) and the second wheel disc (2) are both welded to the side edge of the blade (4) in the thickness direction, and a first weld seam (5) is formed between the first wheel disc (1) and the blade (4), and a second weld seam is formed between the second wheel disc (2) and the blade (4), and the lengths of the first weld seam (5) and the second weld seam both match the length of the blade (4).

3. The centrifugal blower impeller for blade deicing according to claim 2, characterized in that: The width of the first weld (5) and the second weld are both not less than 3 mm.

4. The centrifugal blower impeller for blade deicing according to claim 1, characterized in that: The corners of the blades (4) and the wheel disc structure are welded via reinforced welds (6), and the diameter of the reinforced welds (6) is not less than 5 mm.

5. The centrifugal blower impeller for blade deicing according to any one of claims 1 to 4, characterized in that: The airflow outlet angle and the airflow inlet angle between the blade (4) and the wheel disc structure are both greater than 90 degrees.

6. The centrifugal blower impeller for blade deicing according to claim 5, characterized in that: The blade (4) is of a straight plate type, and the airflow outlet angle is the same as the airflow inlet angle.

7. The centrifugal blower impeller for blade deicing according to any one of claims 1 to 4, characterized in that: The wheel disc structure is integrally formed by a hot die casting process.

8. The centrifugal blower impeller for blade deicing according to any one of claims 1 to 4, characterized in that: The wheel disc structure is made of aluminum alloy or stainless steel; and / or, The blades (4) are made of aluminum alloy or stainless steel.

9. The centrifugal blower impeller for blade deicing according to any one of claims 1 to 4, characterized in that: The inlet diameter of the blade (4) is D1, the impeller diameter of the wheel disc structure is D2, and D1>1 / 2D2.

10. A centrifugal blower for deicing blades, characterized in that: The centrifugal blower for blade deicing comprises the centrifugal blower impeller (100) for blade deicing according to any one of claims 1 to 9.

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