High-strength high-efficiency fan impeller

Abstract

The utility model discloses a high -strength high -efficient fan impeller, it includes blade, wheel disc, wheel cover and hub, the wheel cover adopts mortise type welding with blade, the blade adopts high -efficient lobe flat plate type development structure, and the blade both ends are according to strength and stress calculation, and the positioning blade wheel cover tenon and blade wheel disc tenon are designed, the blade is positioned with the wheel cover tenon insertion wheel cover tenon hole with the wheel cover, the blade is positioned with the wheel disc blade wheel disc tenon insertion wheel disc blade tenon hole, and the wheel disc blade line and the wheel cover line are checked and are in accord, and according to the design weld joint is welded, the present application adopts laser scribe accurate punching tenon positioning, can solve the blade design line forming and the wheel disc wheel cover welding inaccuracy problem, can solve the high -speed rotation of the impeller and the weld bead wear blade difficult problem of centrifugal force drop, is suitable for various high -efficiency high -strength fan use.

Description

Technical Field

[0001] This utility model pertains to a ventilation device, specifically relating to a high-strength, high-efficiency fan impeller. Background Technology

[0002] Centrifugal fans boast advantages such as high flow rate and high pressure, making them widely used in pneumatic conveying and powder / gas conveying applications in grain, paper, textile, and chemical industries. For fans conveying high-pressure, high-temperature gases, heat-resistant stainless steel impellers are typically used. The manual welding method for joining blades to the impeller disc is prone to blade breakage due to welding thermal stress and high-speed rotation. This is especially true after dust erosion and wear, which can cause blades to detach from the impeller disc and cover weld, leading to equipment accidents. Furthermore, the manually welded blade profile and uniform size distribution can introduce errors, affecting impeller performance and efficiency, causing uneven airflow, and even resulting in severe vibrations during high-speed impeller rotation.

[0003] Currently, there is no feasible technology to solve the problem of high-speed blade rotation detaching from the rotor disk; nor is there a reliable solution for accurate indexing and welding control of the blades. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength, high-efficiency fan impeller. The impeller is a welded structure of high-efficiency profile blades and a steel plate cover / disc. By employing a reasonable blade profile and flow channel dimensions, the impeller ensures high-efficiency work output in terms of flow rate and pressure. Through strength analysis, several tenons are designed at the beginning, end, and middle of the contact point between the blades and the disc, with a height slightly lower than the disc thickness by 2-3 mm. Insertion slots are cut at corresponding positions on the disc and disc cover, and the blade design profile is laser-engraved on the disc and disc cover. The blades are then inserted into the corresponding positions and welded inside and out. Through optimized impeller profile design, using plate bending or slight twisting, the impeller meets the requirements of precision forming processes for steel plate cutting.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A high-strength, high-efficiency wind turbine impeller includes blades, a disc, a cover, and a hub. The cover and blades are welded together using a tenon-and-mortise joint. The blades adopt a high-efficiency flat-plate unfolded structure. Based on strength and stress calculations, tenons for positioning the blade cover and the blade disc are designed at both ends. The blades and cover are positioned by inserting the blade cover tenon into the cover tenon hole. The blades and disc are positioned by inserting the blade disc tenon into the disc blade tenon hole. The blade profile and cover profile are checked for fit, and welding is performed according to the designed weld seam.

[0006] As a further improvement of this utility model, the contact end between the blade and the wheel cover is designed with a boss tenon that conforms to the constraints of gravity and centrifugal force.

[0007] As a further improvement of this utility model, the actual contact profile of the blades of the wheel and wheel cover is precisely marked by laser.

[0008] As a further improvement of this utility model, the tenon portion of the actual contact profile of the blades of the wheel disc and wheel cover is precisely grooved by laser.

[0009] As a further improvement of this utility model, the blades and the wheel cover / disc are fully welded on both sides, and the grooved tenon part of the wheel cover / disc is welded flat on the outside, so as not to disturb the airflow.

[0010] Compared with the prior art, the advantages of the present invention are: This new impeller features more precise blade profile manufacturing compared to conventional impellers, resulting in higher design efficiency. The impeller's non-mortise and tenon welding provides higher strength, completely preventing blade detachment. The shape and structure of the blade inlet ensure high efficiency and stability during long-term fan operation. The impeller disc is positioned to the hub using 4-6 hinged bolts and tightened with 8-20 high-strength bolts, guaranteeing high overall impeller strength. The impeller and main shaft employ a small interference fit, preventing loosening even at high speeds or frequent speed changes. Attached Figure Description

[0011] Figure 1 This is a product structure diagram of this utility model; Figure 2 This is a development diagram of the impeller blades of this utility model; Figure 3 This is a drawing of the scribe line opening of the wheel according to this utility model; Figure 4 This is a drawing of the scribe line and hole of the wheel cover of this utility model; Figure 5 This is the utility model Figure 1 Enlarged view of a section at point D; Figure 6 This is the utility model Figure 1 Enlarged view of a section at point E in the middle; Figure 7 This is the utility model Figure 1 Enlarged view of a section at point F.

[0012] In the diagram: 1. Wheel cover; 2. Blade; 3. Wheel disc; 4. Bolt; 5. Wheel hub; 6. Blade wheel cover tenon; 7. Blade wheel disc tenon; 8. Wheel disc blade profile; 9. Wheel disc blade tenon hole; 10. Wheel cover tenon hole; 11. Wheel cover blade profile; 12. Tenon gap A; 13. Tenon gap B; 14. Tenon gap C; 15. Outer weld; 16. Wheel hub stop; 17. Wheel hub contact surface. Detailed Implementation

[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0014] A high-strength, high-efficiency wind turbine impeller includes blades 2, a disc 3, a cover 1, and a hub 5. The cover 1 and blades 2 are welded together using a tenon-and-mortise joint. The blades 2 adopt a high-efficiency flat blade-shaped unfolded structure. Based on strength and stress calculations, tenons 6 for positioning the blade cover and tenons 7 for the blade disc are designed at both ends of the blade. The blades 2 and cover 1 are positioned by inserting the tenons 6 into the tenon holes 10 of the cover. The blades 2 and disc 3 are positioned by inserting the tenons 7 into the blade tenon holes 9 of the disc. The blade profile 8 and cover profile 11 are checked for fit, and welding is performed according to the designed weld seam.

[0015] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, the blade 2 contacts the end faces of the wheel cover 1 and the wheel disk 3. The wheel cover blade profile 11 and the wheel disk blade profile 8 are laser-drawn at the corresponding positions of the three-dimensional flow or twisted profile of the blade 2. The wheel cover tenon hole 10 and the wheel disk blade tenon hole 9 are respectively made at the positions of the blade wheel cover tenon 6 and the blade wheel disk tenon 7. The peripheral gap A between the blade wheel cover tenon 6, the wheel cover tenon hole 10 and the wheel disk blade tenon hole 9 is 0.2~0.5mm. The height of the blade wheel cover tenon 6 is B = 2~3mm lower than the thickness of the wheel cover 1. The thickness of the tenon 7 is C = 3~5mm lower than that of the wheel disk 3.

[0016] like Figure 5 , Figure 6 As shown, the weld height between the blade tenons 6 and 7 and the wheel cover 1 and wheel disc 3 is 1-3mm, and the R-arc protrusion is smooth.

[0017] like Figure 1 , Figure 3 , Figure 7 As shown, the contact surface 17 between the hub 5, the disc 3 and the hub is machined to be flat and perpendicular to the hub stop 16.

[0018] like Figure 1 , Figure 7 As shown, the hub 5 and the disc 3 are connected by hinge bolts 4 for positioning and by high-strength bolts for uniform tightening.

[0019] like Figure 3 , Figure 4 As shown, after the blade 2 and the wheel disk 3 are spliced ​​together, the welding sequence adopts a symmetrical staggered form.

[0020] Due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: This new impeller features more precise blade profile manufacturing compared to conventional impellers, resulting in higher design efficiency. The impeller's non-mortise and tenon welding provides higher strength, completely preventing blade detachment. The shape and structure of the blade inlet ensure high efficiency and stability during long-term fan operation. The impeller disc is positioned to the hub using 4-6 hinged bolts and tightened with 8-20 high-strength bolts, guaranteeing high overall impeller strength. The impeller and main shaft employ a small interference fit, preventing loosening even at high speeds or frequent speed changes.

[0021] This utility model discloses a high-strength and high-efficiency fan impeller, which adopts laser scribing and precise drilling tenon positioning. It can solve the problem of inaccurate welding between the blade design profile and the impeller cover after forming. At the same time, it can solve the problems of high-speed rotation of the impeller and blade detachment due to centrifugal force caused by weld wear. It is suitable for use in various high-efficiency and high-strength fans.

[0022] Although the present invention has been described above, various modifications can be made to it and equivalent components can be replaced without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features disclosed in the present invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to what is disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high-strength, high-efficiency fan impeller, characterized in that: It includes blades (2), a wheel disc (3), a wheel cover (1), and a wheel hub (5); the wheel cover (1) and the blade (2) are welded together by tenon and mortise; the blade (2) adopts a high-efficiency blade-shaped flat plate unfolding structure, and the blade ends are designed with positioning blade wheel cover tenons (6) and blade wheel disc tenons (7) according to strength and stress calculations; the blade (2) and the wheel cover (1) are positioned by inserting the blade wheel cover tenon (6) into the wheel cover tenon hole (10); the blade (2) and the wheel disc (3) are positioned by inserting the blade wheel disc tenon (7) into the wheel disc blade tenon hole (9), and the wheel disc blade profile (8) and the wheel cover blade profile (11) are checked to match, and the weld is performed according to the design weld.

2. The high-strength, high-efficiency fan impeller according to claim 1, characterized in that: The blade (2) contacts the end face of the wheel cover (1) and the wheel disk (3). The wheel cover blade profile (11) and the wheel disk blade profile (8) are laser-drawn according to the corresponding position of the three-dimensional flow or twisted profile of the blade (2). The wheel cover tenon hole (10) and the wheel disk blade tenon hole (9) are respectively made at the positions of the blade wheel cover tenon (6) and the blade wheel disk tenon (7). The gap A between the blade wheel cover tenon (6), the wheel cover tenon hole (10) and the wheel disk blade tenon hole (9) is 0.2-0.5mm. The height of the blade wheel cover tenon (6) is B-2-3mm lower than the thickness of the wheel cover (1). The thickness of the tenon (7) is C-3-5mm lower than that of the wheel disk (3).

3. A high-strength, high-efficiency fan impeller according to claim 2, characterized in that: The weld height between the blade wheel cover tenon (6), (7) and the wheel cover (1) wheel disc (3) is 1-3mm, and the R arc protrusion is smooth.

4. A high-strength, high-efficiency fan impeller according to claim 1, characterized in that: The wheel hub (5), wheel disc (3) and wheel hub contact surface (17) are machined to be flat and perpendicular to the wheel hub stop (16).

5. A high-strength, high-efficiency fan impeller according to claim 4, characterized in that: The hub (5) and the disc (3) are connected by hinge bolts (4) for positioning and by high-strength bolts for uniform tightening.

6. A high-strength, high-efficiency fan impeller according to claim 2, characterized in that: After the blade (2) and the wheel (3) are spliced ​​together, the welding sequence adopts a symmetrical staggered form.

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