A pump body structure based on split injection molding and friction welding

Abstract

The utility model belongs to submersible pump technical field, especially point to a kind of pump body structure based on split injection molding and friction welding, including lower pump body and upper pump body, the upper surface of lower pump body is formed lower annular boss on convex, lower annular boss is integrally formed with lower pump body by injection molding, the lower surface of upper pump body is formed upper annular boss on convex, upper annular boss is integrally formed with upper pump body by injection molding, the distance between upper annular boss outer side wall and lower annular boss outer side wall is equal to the distance between upper annular boss inner side wall and lower annular boss inner side wall, upper pump body is fixedly connected with lower pump body by upper annular boss and lower annular boss friction welding.The utility model mould simple structure, short manufacturing cycle, low in cost, and product is not prone to deformation due to the difference of wall thickness, shrinkage uniform, small, low tonnage requirement of injection molding equipment, small energy consumption, not easy to crack, convenient to demould simultaneously, easy to realize beautiful curved surface and diversification texture, convenient product aesthetics innovation.

Description

Technical Field

[0001] This utility model belongs to the field of submersible pump technology, specifically referring to a pump body structure based on split injection molding and friction welding. Background Technology

[0002] Currently, traditional submersible pump bodies are mostly manufactured using integral casting or one-piece injection molding processes. While one-piece injection molding can create a complete pump body structure, it still presents several problems: 1. Complex mold structure, long manufacturing cycle, and high cost; 2. Products are prone to deformation due to large differences in wall thickness and uneven shrinkage, affecting dimensional accuracy and assembly performance; 3. Large one-piece components require high-tonnage injection molding equipment, resulting in high energy consumption, and residual stress can easily lead to cracking in weak areas such as the inlet; 4. Appearance design is constrained by the demolding process, making it difficult to achieve beautiful curved surfaces and diverse textures, thus limiting product aesthetic innovation. Utility Model Content

[0003] The purpose of this utility model is to provide a pump body structure based on split injection molding and friction welding. Its mold structure is simple, the manufacturing cycle is short, and the cost is low. The product is not easily deformed due to small wall thickness difference and uniform shrinkage. It has a small volume, low requirements for injection molding equipment tonnage, low energy consumption, and is not easy to crack. At the same time, it is easy to demold and easy to achieve beautiful curved surfaces and diverse textures, which facilitates product aesthetic innovation.

[0004] This utility model is implemented as follows: A pump body structure based on split injection molding and friction welding includes a lower pump body and an upper pump body. The upper surface of the lower pump body is recessed to form a lower pump cavity. The bottom of the lower pump body has a water inlet communicating with the lower pump cavity. The lower pump body has multiple feet for supporting the pump body. The upper surface of the lower pump body protrudes to form a lower annular boss surrounding the lower pump cavity. The lower annular boss and the lower pump body are integrally formed by injection molding. The lower surface of the upper pump body is recessed to form an upper pump cavity adapted to the lower pump cavity. The top of the upper pump body has a mounting hole. The water outlet and mounting hole are all connected to the upper pump chamber. The lower surface of the upper pump body protrudes to form an upper annular boss surrounding the outer periphery of the upper pump chamber. The upper annular boss and the upper pump body are integrally formed by injection molding. The width of the upper annular boss is smaller than the width of the lower annular boss, and the distance between the outer walls of the upper and lower annular bosses is equal to the distance between the inner walls of the upper and lower annular bosses. The upper pump body is fixedly connected to the lower pump body by friction welding of the upper and lower annular bosses.

[0005] In the above-mentioned pump body structure based on split injection molding and friction welding, the lower surface of the upper pump body protrudes to form a convex ring one and a convex ring two. The convex ring two is located inside the convex ring one, and the upper annular boss is arranged between the convex ring one and the convex ring two. The upper annular boss, the lower annular boss and the convex ring one form an overflow groove one, and the upper annular boss, the lower annular boss and the convex ring two form an overflow groove two.

[0006] In the pump body structure based on split injection molding and friction welding described above, the sum of the volumes of overflow trough one and overflow trough two is greater than the volume of the upper annular boss.

[0007] In the pump body structure based on split injection molding and friction welding described above, the heights of both the first and second convex rings are higher than the height H2 of the upper annular boss, and the height H4 of the second convex ring is lower than the height H1 of the lower annular boss.

[0008] In the pump body structure based on split injection molding and friction welding described above, the height H3 of the first convex ring is higher than the height H1 of the lower annular boss.

[0009] In the pump body structure based on split injection molding and friction welding described above, after the friction welding is completed, there is a gap of less than 0.5mm between the lower surface of the second convex ring and the upper surface of the lower pump body.

[0010] In the above-mentioned pump body structure based on split injection molding and friction welding, the upper outer side wall of the lower pump body protrudes to form a lower mounting boss, and the lower annular boss is disposed on the lower mounting boss; the lower end of the upper pump body protrudes to form an upper mounting boss, and the convex ring is disposed on the upper mounting boss.

[0011] In the above-mentioned pump body structure based on split injection molding and friction welding, the lower annular boss, the lower mounting boss and the lower pump body are integrally formed by injection molding, and the upper annular boss, convex ring one, convex ring two, the upper mounting boss and the upper pump body are integrally formed by injection molding.

[0012] In the pump body structure based on split injection molding and friction welding described above, the lower surface of the lower mounting boss is recessed to form a process groove for positioning.

[0013] In the pump body structure based on split injection molding and friction welding described above, the height H1 of the lower annular boss is higher than the height H2 of the upper annular boss.

[0014] In the pump body structure based on split injection molding and friction welding described above, the ratio of the width of the upper annular boss to the width of the lower annular boss is 0.5-0.7.

[0015] In the pump body structure based on split injection molding and friction welding described above, the height of the upper annular boss is 0.8mm-1.2mm.

[0016] In the pump body structure based on split injection molding and friction welding described above, the upper annular boss and the lower annular boss are made of different materials. During the friction welding process, the material of the upper annular boss melts before the material of the lower annular boss.

[0017] In the above-mentioned pump body structure based on split injection molding and friction welding, the materials of the upper annular boss and the lower annular boss can be: the material of the upper annular boss is polypropylene, and the material of the lower annular boss is glass fiber reinforced polypropylene (PP+GF20%).

[0018] In the above-mentioned pump body structure based on split injection molding and friction welding, the materials of the upper annular boss and the lower annular boss can also be: the material of the upper annular boss is ABS plastic (acrylonitrile-butadiene-styrene plastic), and the material of the lower annular boss is PPO (polyphenylene oxide).

[0019] The outstanding advantages of this utility model compared to the prior art are: This invention divides the pump body into a lower pump body with a lower pump chamber, an inlet, and a base, and an upper pump body with an upper pump chamber, a mounting hole, and an outlet. A lower annular boss protrudes from the upper surface of the lower pump body, surrounding the lower pump chamber, and a lower annular boss protrudes from the lower surface of the upper pump body, surrounding the upper pump chamber. The lower and upper annular bosses are fixedly connected by friction welding. The lower and upper pump bodies are injection molded separately. The mold structure is simple, the manufacturing cycle is short, and the cost is low. Furthermore, the product has small wall thickness differences and uniform shrinkage, making it less prone to defects. It is deformable, small in size, requires low tonnage of injection molding equipment, consumes little energy, is not prone to cracking, and is easy to demold. It is also easy to achieve beautiful curved surfaces and diverse textures, which facilitates product aesthetic innovation. At the same time, the width of the upper annular boss is smaller than the width of the lower annular boss, and the distance between the outer walls of the upper and lower annular bosses is equal to the distance between the inner walls of the upper and lower annular bosses. This ensures that the upper and lower annular bosses are always in contact during the friction welding process, resulting in good friction welding effect. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention.

[0021] Figure 2 This is a perspective view of the lower pump body of this utility model.

[0022] Figure 3 This is a perspective view of the upper pump body of this utility model.

[0023] Figure 4 This is a partial structural diagram of the present invention before welding.

[0024] Figure 5This is a partial structural diagram of the present invention after welding.

[0025] Figure 6 This is a cross-sectional view of the present invention after welding.

[0026] Reference numerals in the attached drawings: 1. Lower pump body; 2. Upper pump body; 3. Lower pump chamber; 4. Inlet; 5. Foot; 6. Lower annular boss; 7. Upper pump chamber; 8. Mounting hole; 9. Outlet; 10. Upper annular boss; 11. Plug ring one; 12. Plug ring two; 13. Overflow trough one; 14. Overflow trough two; 15. Lower mounting boss; 16. Upper mounting boss; 17. Process groove. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —6: A pump body structure based on split injection molding and friction welding includes a lower pump body 1 and an upper pump body 2. The upper surface of the lower pump body 1 is recessed to form a lower pump cavity 3. The bottom of the lower pump body 1 is provided with an inlet 4 communicating with the lower pump cavity 3. The lower pump body 1 is provided with multiple feet 5 for supporting the pump body. The upper surface of the lower pump body 1 is convex to form a lower annular boss 6 surrounding the lower pump cavity 3. The lower annular boss 6 and the lower pump body 1 are integrally formed by injection molding. The lower surface of the upper pump body 2 is recessed to form an upper pump cavity 7 adapted to the lower pump cavity 3. The top of the upper pump body 2 is provided with a mounting hole 8 and a water outlet. The port 9, mounting hole 8, and water outlet 9 are all connected to the upper pump chamber 7. The lower surface of the upper pump body 2 protrudes downward to form an upper annular boss 10 surrounding the outer periphery of the upper pump chamber 7. The upper annular boss 10 and the upper pump body 2 are integrally formed by injection molding. The width of the upper annular boss 10 is smaller than the width of the lower annular boss 6, and the distance between the outer wall of the upper annular boss 10 and the outer wall of the lower annular boss 6 is equal to the distance between the inner wall of the upper annular boss 10 and the inner wall of the lower annular boss 6. The upper pump body 2 is fixedly connected to the lower pump body 1 by friction welding of the upper annular boss 10 and the lower annular boss 6.

[0028] The processing procedure of this utility model is as follows: First, the lower pump body 1 with a lower annular boss 6 and the upper pump body 2 with an upper annular boss 10 are integrally molded by injection molding. Then, the upper annular boss 10 and the lower annular boss 6 are friction welded together, thereby fixing the upper pump body 2 and the lower pump body 1 together.

[0029] like Figure 1-6As shown, this utility model divides the pump body into a lower pump body 1 having a lower pump chamber 3, a water inlet 4, and a base 5, and an upper pump body 2 having an upper pump chamber 7, a mounting hole 8, and a water outlet 9. A lower annular boss 6 is formed protruding from the upper surface of the lower pump body 1, surrounding the lower pump chamber 3. An upper annular boss 10 is formed protruding from the lower surface of the upper pump body 2, surrounding the upper pump chamber 7. The lower annular boss 6 and the upper annular boss 10 are fixedly connected by friction welding. The lower pump body 1 and the upper pump body 2 are formed separately by injection molding. The mold structure is simple, the manufacturing cycle is short, and the cost is low. Furthermore, the product exhibits minimal shrinkage due to small differences in wall thickness. It is uniform and not easily deformed, has a small volume, requires low tonnage of injection molding equipment, consumes little energy, is not prone to cracking, and is easy to demold. It is also easy to achieve beautiful curved surfaces and diverse textures, which facilitates product aesthetic innovation. At the same time, the width of the upper annular boss 10 is smaller than the width of the lower annular boss 6, and the distance between the outer wall of the upper annular boss 10 and the outer wall of the lower annular boss 6 is equal to the distance between the inner wall of the upper annular boss 10 and the inner wall of the lower annular boss 6. This ensures that the upper annular boss 10 and the lower annular boss 6 are always in contact during the friction welding process, resulting in a good friction welding effect.

[0030] The upper pump body 2 and the lower pump body 1 of this invention form a continuous, dense and seamless welding zone at the joint surface through friction welding.

[0031] Furthermore, the lower surface of the upper pump body 2 protrudes to form a first protrusion ring 11 and a second protrusion ring 12. The second protrusion ring 12 is located inside the first protrusion ring 11, and the upper annular boss 10 is disposed between the first protrusion ring 11 and the second protrusion ring 12. An overflow groove 13 is formed between the upper annular boss 10, the lower annular boss 6 and the first protrusion ring 11, and an overflow groove 24 is formed between the upper annular boss 10, the lower annular boss 6 and the second protrusion ring 12. These are used to accommodate the molten material extruded during the friction welding process, avoid appearance contamination and ensure a clean joint surface.

[0032] Furthermore, the sum of the volumes of the overflow trough 13 and the overflow trough 14 is greater than the volume of the upper annular boss 10.

[0033] To better accommodate the molten material, such as Figure 1-6 As shown, the height H3 of the first convex ring 11 and the height H4 of the second convex ring 12 are both higher than the height H2 of the upper annular boss 10, and the height H4 of the second convex ring 12 is lower than the height H1 of the lower annular boss 6, which effectively avoids interference between the second convex ring 12 and the lower pump body 1.

[0034] In order to effectively contain the molten overflow after friction welding and ensure an aesthetically pleasing appearance, the height H3 of the raised ring 11 is higher than the height H1 of the lower annular boss 6.

[0035] To effectively prevent molten material from entering the pump chamber while avoiding interference between the second convex ring 12 and the lower pump body 1, a gap of less than 0.5 mm is left between the lower surface of the second convex ring 12 and the upper surface of the lower pump body 1 after friction welding. In this embodiment, a gap of 0.1 mm is left between the lower surface of the second convex ring 12 and the upper surface of the lower pump body 1 after friction welding.

[0036] To ensure sufficient space for installing the lower annular boss 6 and the convex ring 11 without increasing the overall thickness of the lower pump body 1 and the upper pump body 2, such as... Figure 1-6 As shown, the upper outer side wall of the lower pump body 1 protrudes outward to form a lower mounting boss 15, and the lower annular boss 6 is disposed on the lower mounting boss 15; the lower end of the upper pump body 2 protrudes outward to form an upper mounting boss 16, and the convex ring 11 is disposed on the upper mounting boss 16.

[0037] Furthermore, the lower annular boss 6, the lower mounting boss 15, and the lower pump body 1 are integrally formed by injection molding, and the upper annular boss 10, the first convex ring 11, the second convex ring 12, the upper mounting boss 16, and the upper pump body 2 are integrally formed by injection molding.

[0038] In order to facilitate the positioning of the lower pump body 1 during clamping, the lower surface of the lower mounting boss 15 is recessed to form a process groove 17 for positioning.

[0039] Furthermore, the height H1 of the lower annular boss 6 is higher than the height H2 of the upper annular boss 10, so that during the friction welding process, the bottom of the upper annular boss 10 melts into a sealing weld before the top of the lower annular boss 6.

[0040] To further ensure that the upper annular boss 10 and the lower annular boss 6 remain in contact during the friction welding process, resulting in a good friction welding effect and a strong and reliable weld, the width ratio of the upper annular boss 10 to the lower annular boss 6 is 0.5-0.7. In this embodiment, the width ratio of the upper annular boss 10 to the lower annular boss 6 is 0.6.

[0041] To ensure a strong and reliable weld while using a press with the lowest possible pressure, the height of the upper annular boss 10 is 0.8mm-1.2mm. In this embodiment, the height of the upper annular boss 10 is 1.0mm.

[0042] To achieve better welding quality, the upper annular boss 10 and the lower annular boss 6 are made of different materials. During friction welding, the material of the upper annular boss 10 melts before the material of the lower annular boss 6, resulting in a stepped melting process. In this embodiment, the upper annular boss 10 is made of polypropylene, and the lower annular boss 6 is made of glass fiber reinforced polypropylene (PP+GF20%). This invention significantly reduces the mold complexity and molding difficulty of individual components through split injection molding, and improves the dimensional accuracy and surface quality of parts; it utilizes friction welding to achieve a high-strength, high-sealing connection between the two parts, resulting in a robust and reliable overall structure suitable for submersible pump operating conditions.

[0043] This utility model has a reasonable structure, reliable sealing, is easy to mold, and is suitable for mass production.

[0044] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A pump body structure based on split injection molding and friction welding, characterized in that: The pump includes a lower pump body (1) and an upper pump body (2). The upper surface of the lower pump body (1) is recessed to form a lower pump cavity (3). The bottom of the lower pump body (1) is provided with an inlet (4) that connects to the lower pump cavity (3). The lower pump body (1) is provided with multiple feet (5) for supporting the pump body. The upper surface of the lower pump body (1) is convex to form a lower annular boss (6) surrounding the lower pump cavity (3). The lower annular boss (6) and the lower pump body (1) are integrally formed by injection molding. The lower surface of the upper pump body (2) is recessed to form an upper pump cavity (7) that matches the lower pump cavity (3). The top of the upper pump body (2) is provided with a mounting hole (8) and an outlet (9). The mounting hole (8) Both the upper pump body (2) and the outlet (9) are connected to the upper pump chamber (7). The lower surface of the upper pump body (2) protrudes downward to form an upper annular boss (10) surrounding the outer periphery of the upper pump chamber (7). The upper annular boss (10) and the upper pump body (2) are integrally formed by injection molding. The width of the upper annular boss (10) is smaller than the width of the lower annular boss (6), and the distance between the outer wall of the upper annular boss (10) and the outer wall of the lower annular boss (6) is equal to the distance between the inner wall of the upper annular boss (10) and the inner wall of the lower annular boss (6). The upper pump body (2) is fixedly connected to the lower pump body (1) by friction welding of the upper annular boss (10) and the lower annular boss (6).

2. The pump body structure based on split injection molding and friction welding according to claim 1, characterized in that: The lower surface of the upper pump body (2) protrudes to form a first protrusion ring (11) and a second protrusion ring (12). The second protrusion ring (12) is located inside the first protrusion ring (11), and the upper annular boss (10) is arranged between the first protrusion ring (11) and the second protrusion ring (12). An overflow groove (13) is formed between the upper annular boss (10), the lower annular boss (6) and the first protrusion ring (11), and an overflow groove (14) is formed between the upper annular boss (10), the lower annular boss (6) and the second protrusion ring (12).

3. The pump body structure based on split injection molding and friction welding according to claim 2, characterized in that: The heights of the first convex ring (11) and the second convex ring (12) are both higher than the height of the upper annular boss (10), while the height of the second convex ring (12) is lower than the height of the lower annular boss (6).

4. The pump body structure based on split injection molding and friction welding according to claim 3, characterized in that: After friction welding is completed, a gap of less than 0.5 mm is left between the lower surface of the second convex ring (12) and the upper surface of the lower pump body (1).

5. A pump body structure based on split injection molding and friction welding according to claim 2, characterized in that: The upper outer side wall of the lower pump body (1) protrudes outward to form a lower mounting boss (15), and the lower annular boss (6) is disposed on the lower mounting boss (15); the lower end of the upper pump body (2) protrudes outward to form an upper mounting boss (16), and the convex ring (11) is disposed on the upper mounting boss (16).

6. A pump body structure based on split injection molding and friction welding according to claim 5, characterized in that: The lower surface of the lower mounting boss (15) is recessed to form a process groove (17) for positioning.

7. The pump body structure based on split injection molding and friction welding according to claim 1, characterized in that: The height of the lower annular boss (6) is higher than the height of the upper annular boss (10).

8. The pump body structure based on split injection molding and friction welding according to claim 1, characterized in that: The width ratio of the upper annular boss (10) to the width of the lower annular boss (6) is 0.5-0.

7.

9. A pump body structure based on split injection molding and friction welding according to claim 1, characterized in that: The height of the upper annular boss (10) is 0.8mm-1.2mm.

10. A pump body structure based on split injection molding and friction welding according to claim 1, characterized in that: The upper annular boss (10) and the lower annular boss (6) are made of different materials. During the friction welding process, the material of the upper annular boss (10) melts before the material of the lower annular boss (6).

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