Automobile water pump impeller assembly and welding tool thereof

Abstract

The application relates to an automobile water pump impeller assembly and a welding tool thereof, which comprises a rotor connected with a wheel disc, the wheel disc is provided with a plurality of arc-shaped blades extending from the outer circle of the wheel disc to the center, further comprises an impeller front cover matched with the arc-shaped blades, the impeller front cover is provided with an arc-shaped groove matched with the arc-shaped blades, and the two sides of the arc-shaped groove are provided with convex parts matched with the arc-shaped blades. In the application, the impeller front cover is integrally formed by injection molding, the positioning hole is cancelled, and the product strength is reliable after injection molding; the convex parts are matched with the arc-shaped blades, the arc-shaped blades are prevented from shaking and displacing in the arc-shaped groove during welding, the welding precision is influenced, a slope and a curved surface are arranged on the convex parts, water flow is facilitated, and water flow impact is reduced.

Description

Technical Field

[0001] This invention relates to the field of automotive parts, specifically to an automotive water pump impeller assembly and its welding fixture. Background Technology

[0002] Traditional impeller covers are made of PPS+GF40 material and injection molded. The product has many positioning holes, which leads to weld lines during injection molding and reduces product strength. Due to the limited width of the impeller blades, the positioning posts are very small, easily causing poor venting during injection molding and resulting in burning of the positioning posts. Considering these two product defects, the impeller cover and impeller are ultrasonically welded to meet product requirements during the impeller rotor assembly. However, during ultrasonic welding, the product undergoes slight rotation, causing stress on one side of the positioning holes and positioning posts, leading to cracks near the holes after welding and resulting in product defects. Therefore, an automotive water pump impeller assembly and its welding fixture were designed and developed. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes an automotive water pump impeller assembly and its welding fixture. The technical problem to be solved by this invention is achieved through the following technical solution:

[0004] An automotive water pump impeller assembly includes a rotor connected to a wheel disc, and the wheel disc is provided with a plurality of arc-shaped blades extending from the outer circle of the wheel disc toward the center.

[0005] An automotive water pump impeller assembly further includes an impeller front cover that mates with arc-shaped blades. The impeller front cover has an arc-shaped groove that engages with the arc-shaped blades, and both sides of the arc-shaped groove have protrusions that fit against the arc-shaped blades.

[0006] As a further improvement of the present invention, the protrusion extends from the impeller front cover along the arcuate groove trajectory toward the center of the impeller front cover.

[0007] As a further improvement of the present invention, the protrusion is provided with an inclined surface near the front cover of the impeller to facilitate water flow.

[0008] As a further improvement of the present invention, the side of the protrusion away from the arc groove is provided with an arc surface to reduce the impact of water flow. The arc surface extends from the end face of the impeller front cover to the top of the protrusion and transitions with the inclined arc near the center of the impeller front cover.

[0009] As a further improvement of the present invention, the angle between the inclined surface and the arc surface is an obtuse angle and the end of the inclined surface extends to the arc groove.

[0010] As a further improvement of the present invention, the height of the protrusion is 0.5 mm to 1 mm.

[0011] As a further improvement of the present invention, the length of the protrusion is 2mm to 5mm.

[0012] As a further improvement of the present invention, the impeller front cover is integrally injection molded.

[0013] As another improvement of the present invention, a welding fixture for an automotive water pump impeller assembly is proposed, comprising an upper fixture and a lower fixture. The upper fixture is provided with a first cavity that conformally fits the front cover of the impeller, and the lower fixture is provided with a second cavity that conformally fits the rotor.

[0014] The bottom surface of the wheel is fitted with the lower tooling.

[0015] The beneficial effects of this invention are:

[0016] In this invention, the impeller front cover is integrally injection molded, eliminating the positioning hole and ensuring reliable product strength after injection molding. The protrusion fits snugly with the arc-shaped blade to prevent the arc-shaped blade from shifting and affecting welding accuracy during welding. At the same time, the protrusion is provided with a slope and an arc surface to facilitate water flow and reduce water flow impact. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 3 This is a three-dimensional structural diagram of the impeller front cover of the present invention;

[0021] Figure 4 For the present invention Figure 3 A magnified view of I.

[0022] As shown in the figure:

[0023] 1. Rotor; 2. Disc; 3. Arc-shaped blade; 4. Impeller front cover; 5. Arc-shaped groove; 6. Protrusion; 7. Upper tooling; 8. Lower tooling; 9. Cavity No. 1; 10. Cavity No. 2; 61. Inclined surface; 62. Arc surface. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described more clearly and completely below with reference to the accompanying drawings in the embodiments. Of course, the described embodiments are only a part of the present invention and not all of it. Based on this embodiment, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of the present invention.

[0025] Example 1:

[0026] like Figures 1 to 4 As shown, an automotive water pump impeller assembly includes a rotor 1, the rotor 1 being connected to a wheel disk 2, and the wheel disk 2 having a plurality of arc-shaped blades 3 extending from the outer circle of the wheel disk 2 toward the center.

[0027] It also includes an impeller front cover 4 that mates with the arc-shaped blade 3. The impeller front cover 4 is provided with an arc-shaped groove 5 that engages with the arc-shaped blade 3. Both sides of the arc-shaped groove 5 are provided with protrusions 6 that fit against the arc-shaped blade 3. The radial rotation direction positioning is solved by the protrusions 6 fitting against the arc-shaped blade 3, preventing misalignment between the impeller front cover 4 and the arc-shaped blade 3. At the same time, the welding overflow material directly enters into the arc-shaped groove 5, solving the overflow problem during product welding.

[0028] Specifically, the protrusion 6 of the present invention extends from the impeller front cover 4 along the trajectory of the arc groove 5 toward the center of the impeller front cover 4.

[0029] like Figure 4 As shown, as a further optimized design, the protrusion 6 is provided with an inclined surface 61 near the impeller front cover 4 to facilitate water flow.

[0030] The protrusion 6 has an arc surface 62 on the side away from the arc groove 5 to reduce the impact of water flow. The arc surface 62 extends from the end face of the impeller front cover 4 to the top of the protrusion 6 and transitions to the inclined surface 61 in an arc near the center of the impeller front cover 4. The inclined surface 61 and the arc surface 62 work together to reduce the impact of water flow on the protrusion 6. The arc transition between the inclined surface 61 and the arc surface 62 further reduces the impact of water flow on the protrusion 6.

[0031] like Figure 3 As shown, the angle between the inclined surface 61 and the arc surface 62 of the present invention is an obtuse angle, and the end of the inclined surface 61 extends to the arc groove 5.

[0032] Furthermore, such as Figure 4 As shown, the height of the protrusion 6 is 0.5 mm to 1 mm.

[0033] Furthermore, such as Figure 4 As shown, the length of the protrusion 6 is 2mm to 5mm.

[0034] The impeller front cover 4 is injection molded as a single piece, which solves the problem of product welding defects caused by poor injection molding of parts and cracking caused by stress during the welding process.

[0035] Example 2:

[0036] As another embodiment of the present invention, a welding fixture for an automotive water pump impeller assembly is proposed, including an upper fixture 7 and a lower fixture 8. The upper fixture 7 is provided with a first cavity 9 that conformally fits the front cover 4 of the impeller, and the lower fixture 8 is provided with a second cavity 10 that conformally fits the rotor 1. The first cavity 9 and the second cavity 10 solve the axial positioning of the product and prevent shaking during welding.

[0037] The bottom surface of the wheel 2 fits into the lower tooling 8 to provide support.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely prisms of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An automotive water pump impeller assembly, characterized in that: Includes a rotor (1), the rotor (1) is connected to a wheel disk (2), and the wheel disk (2) is provided with a plurality of arc-shaped blades (3) extending from the outer circle of the wheel disk (2) toward the center; It also includes an impeller front cover (4) that cooperates with the arc blade (3). The impeller front cover (4) is provided with an arc groove (5) that engages with the arc blade (3). Both sides of the arc groove (5) are provided with protrusions (6) that fit with the arc blade (3). The protrusion (6) extends from the impeller front cover (4) along the arc groove (5) toward the center of the impeller front cover (4); The protrusion (6) near the impeller front cover (4) has an inclined surface (61) to facilitate water flow; The protrusion (6) is provided with an arc surface (62) on the side away from the arc groove (5) to reduce the impact of water flow. The arc surface (62) extends from the end face of the impeller front cover (4) to the top of the protrusion (6) and transitions with the inclined surface (61) in an arc near the center of the impeller front cover (4). The angle between the inclined surface (61) and the arc surface (62) is obtuse, and the end of the inclined surface (61) extends to the arc groove (5).

2. The automotive water pump impeller assembly according to claim 1, characterized in that: The height of the protrusion (6) is 0.5 mm to 1 mm.

3. The automotive water pump impeller assembly according to claim 1, characterized in that: The length of the protrusion (6) is 2 mm to 5 mm.

4. The automotive water pump impeller assembly according to claim 1, characterized in that: The impeller front cover (4) is injection molded as a single piece.

5. A welding fixture for an automotive water pump impeller assembly according to any one of claims 1 to 4, characterized in that: It includes an upper tooling (7) and a lower tooling (8). The upper tooling (7) is provided with a first cavity (9) that conforms to the impeller front cover (4), and the lower tooling (8) is provided with a second cavity (10) that conforms to the rotor (1).

6. The welding fixture for an automotive water pump impeller assembly according to claim 5, characterized in that: The bottom surface of the wheel (2) is in contact with the lower tooling (8).

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