A pump body structure with high sealing performance

Abstract

This invention discloses a pump body structure with high sealing performance, belonging to the field of household water pumps. It includes an outer cylinder, an inner cylinder, and a guide plate. An external flow channel is formed between the outer and inner cylinders. An outlet is provided on the outer cylinder. The outer cylinder includes a front bend and a rear bend located at both ends. The inner cylinder includes a front bend and a rear bend located at both ends. Both the front bends of the outer and inner cylinders are welded to the guide plate, and the rear bends of the outer and inner cylinders are also welded together. The connection will not have gaps due to component processing errors. Even if there are large processing errors, the gaps will be filled by the weld filler after welding. This solves the problem in existing technologies where household water pumps use bolts and sealing rings to fix and seal the outer and inner cylinders respectively, which easily leads to gaps at the connection and unreliable sealing.

Description

Technical Field

[0001] This invention relates to the field of household water pumps, and in particular to a pump body structure with high sealing performance. Background Technology

[0002] Household water pumps typically use an outer and inner cylinder to form a flow channel for liquid transport. Because there is a certain water pressure between the outer and inner cylinders during liquid transport, sealing is necessary during assembly to prevent leakage. In existing technology, the outer and inner cylinders are usually assembled using bolts, and a sealing ring is used for sealing. However, due to manufacturing errors in the outer and inner cylinders, gaps can occur at the connection point when using bolts. Even with a sealing ring, leakage can still occur if the gap is large. Furthermore, under long-term water pressure, the sealing ring is prone to aging or damage, leading to seal failure.

[0003] For example, the "Dual-channel water pump for easy diversion" disclosed in Chinese patent literature, with publication number CN114233639B, includes a water pump outer cylinder, a stator assembly, a rotor assembly, and a guide plate. The stator assembly is hermetically disposed inside the water pump outer cylinder, and the rotor assembly is rotatably disposed inside the stator assembly. The outer walls of the water pump outer cylinder and the stator assembly enclose a first space, and the outer wall of the rotor assembly and the inner wall of the stator assembly enclose a second space. The guide plate is provided with an impeller connected to the rotor assembly, and the guide plate is provided with a mounting cavity that matches the impeller. The peripheral wall of the mounting cavity is provided with several vortex grooves, which connect the front and rear ends of the guide plate. The guide plate is provided with water permeable holes that match the rotor assembly, which connect the front and rear ends of the guide plate. The water pump inlet, vortex grooves, first space, and water pump outlet form a first flow channel. The water pump inlet, water permeable holes, second space, and water pump outlet form a second flow channel. The shortcomings of this patent are that both the outer and inner cylinders of the water pump are installed using the control box as the mounting reference and through bolts. Due to the processing errors of the structure itself, gaps are easily generated at the connection, especially at the connection between the front cover and the outer cylinder, where errors accumulate and the gaps become larger, which may lead to water leakage. Furthermore, the sealing is achieved through a sealing ring, which is prone to aging or damage under long-term water pressure, resulting in sealing failure. Summary of the Invention

[0004] The present invention aims to overcome the problem in the prior art where household water pumps use bolts and sealing rings to fix and seal the outer and inner cylinders respectively, which easily leads to gaps at the connection and unreliable sealing. The invention provides a water pump housing structure with high sealing performance that does not require sealing rings and can still provide a reliable and durable seal even when there are processing errors in the outer and inner cylinders.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention discloses a pump body structure with high sealing performance, comprising an outer cylinder, an inner cylinder, and a guide plate. An external flow channel is formed between the outer cylinder and the inner cylinder. The outer cylinder is provided with a water outlet. The outer cylinder includes a front bend and a rear bend located at both ends. The inner cylinder includes a front bend and a rear bend located at both ends. The front bends of the outer cylinder and the inner cylinder are both welded to the guide plate, and the rear bends of the outer cylinder and the inner cylinder are welded together.

[0007] In this application, by bending the outer and inner cylinders and welding them to the guide plate, the relative positions of the three components are fixed, and a seal is formed through the weld. Compared with the existing technology that uses bolts for fixing and sealing rings for sealing, this seal will not fail due to water pressure aging. Furthermore, gaps will not be generated at the connection due to component processing errors. Even if there are large processing errors, the gaps will be filled by the solder after welding. At the same time, the outer and inner cylinders are perpendicular to the guide plate. The bending edges at the front and rear ends of the outer cylinder in this solution provide sufficient contact area between the outer and inner cylinders and the guide plate, avoiding poor perpendicularity after welding. The outer and inner cylinders are coaxial. The bending edges at the front and rear ends of the inner cylinder in this solution provide sufficient contact area between the outer and inner cylinders, thereby ensuring the reliability of the seal.

[0008] Preferably, the bending direction of the outer cylinder's front end bend is away from the outer cylinder's axis, and the weld between the outer cylinder's front end bend and the guide plate is located away from the outer cylinder's axis; the bending direction of the inner cylinder's front end bend is towards the inner cylinder's axis, and the weld between the inner cylinder's front end bend and the guide plate is located close to the inner cylinder's axis. With this structure, the weld is located on the outside of the outer flow channel, allowing the outer cylinder, inner cylinder, and guide plate to be welded after pre-fixation, making welding more convenient. Simultaneously, the presence of the weld does not affect the flow of liquid within the outer flow channel, avoiding energy loss.

[0009] Preferably, the guide plate includes a positioning part and a guiding part, the guiding part being provided with a guiding hole located between the outer cylinder and the inner cylinder. The positioning part facilitates fixing the position of the guide plate, and the guiding part is used to guide liquid into the outer flow channel.

[0010] Preferably, a welding step for the outer cylinder is formed between the positioning part and the guide part, and a welding notch for the outer cylinder is formed between the welding step and the outer cylinder. This structure allows the welding of the outer cylinder to be carried out in the notch, making it less likely for the solder to flow outward, resulting in a higher quality weld.

[0011] Preferably, the guide plate is further provided with an inner cylinder welding step, which is located between the inner cylinder and its axis, forming an inner cylinder welding notch between the inner cylinder welding step and the inner cylinder. This structure allows the welding of the inner cylinder to be carried out in the notch, making it less likely for the solder to flow outward, resulting in a higher quality weld.

[0012] Preferably, the rear end bend of the outer cylinder is located on the side outside the outer flow channel relative to the rear end bend of the inner cylinder; with this structure, when the liquid flows to the outlet in the outer flow channel, it turns inside the rear end bend of the inner cylinder, resulting in less energy loss.

[0013] Preferably, the weld seam between the rear end bend of the outer cylinder and the rear end bend of the inner cylinder is located on one side outside the outer flow channel, making welding more convenient.

[0014] Preferably, the bending angle of the outer cylinder's rear bend is greater than 90°, and the inner cylinder's rear bend is fitted with the outer cylinder's rear bend. This structure makes the outer cylinder's rear bend and the inner cylinder's rear bend form a funnel shape, and they can automatically align during the fitting process, thereby improving the concentricity of the inner and outer cylinders.

[0015] Therefore, the present invention has the following beneficial effects: (1) no gap is generated at the connection of the outer cylinder, inner cylinder and guide plate, and the sealing performance is better; (2) the weld seam generated by welding and other connections will not cause energy loss to the flow of liquid; (3) the welding material is not easy to flow outward during welding, and the welding quality is higher; (4) during the pre-fixing process, the outer cylinder and inner cylinder can be automatically aligned, and the concentricity is higher. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the outer cylinder, inner cylinder, and guide plate of the present invention after welding.

[0017] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 3 This invention is in Figure 2 A magnified view of the marked area.

[0019] In the diagram: 1. Outer cylinder; 2. Inner cylinder; 3. Guide plate; 4. Outer flow channel; 5. Shaft; 6. Rotor; 7. Outlet; 8. Outlet valve; 9. Rear end cover; 10. Front end cover; 11. Front end bearing; 12. Rear end bearing; 13. Impeller; 14. Guide cavity; 15. Front end bend of outer cylinder; 16. Rear end bend of outer cylinder; 17. Front end bend of inner cylinder; 18. Rear end bend of inner cylinder; 19. Positioning part; 20. Guide part; 21. Guide hole; 22. Welded step of outer cylinder; 23. 24. Outer cylinder welding notch; 25. Guide plate reinforcing structure; 26. Inner cylinder welding step; 27. Inner cylinder welding notch; 28. Rear bearing hole; 29. ​​Rear limit seat; 30. Front bearing hole; 31. Radial elastic sealing ring; 32. Support ring; 33. Liquid accumulation cavity; 34. Inner molded structure of guide plate; 35. Liquid accumulation cavity opening; 36. Reinforcing protrusion; 37. Outer wall of guide plate; 38. Mounting block; 39. Elastic structure; 40. Mounting nut; 41. Toothed washer. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1-3 In the illustrated embodiment, a highly sealed pump body structure includes an outer cylinder 1, an inner cylinder 2, and a guide plate 3. An external flow channel 4 is formed between the outer and inner cylinders. A rotating shaft 5 and a rotor 6 are installed inside the inner cylinder, and a water outlet 7 is provided on the outer cylinder. A water outlet valve 8 is installed at the water outlet. The end of the outer and inner cylinders closest to the guide plate is the front end, and the end furthest from the guide plate is the rear end. A rear end cover 9 is installed at the rear end of the outer and inner cylinders, and a front end cover 10 is installed at the front end of the outer and inner cylinders. A front end bearing 11 is installed in the front end cover, and a rear end bearing 12 is installed in the rear end cover. The rotating shaft is adapted to the front and rear end bearings. An impeller 13 is installed on the rotating shaft at the front side of the guide plate, and a guide cavity 14 is provided outside the impeller.

[0022] The outer cylinder includes a front bend 15 and a rear bend 16 located at both ends. The inner cylinder includes a front bend 17 and a rear bend 18 located at both ends. Both the front bends of the outer and inner cylinders are welded to a guide plate, and the rear bends of the outer and inner cylinders are welded together. The bending direction of the front bend of the outer cylinder is away from the outer cylinder axis, and the weld between the front bend and the guide plate is located away from the outer cylinder axis. The bending direction of the front bend of the inner cylinder is towards the inner cylinder axis, and the weld between the front bend and the guide plate is located close to the inner cylinder axis. The rear bend of the outer cylinder is located on the side outside the outer flow channel relative to the rear bend of the inner cylinder. The weld between the rear bend of the outer cylinder and the rear bend of the inner cylinder is located on the side outside the outer flow channel.

[0023] The guide plate includes a positioning part 19 and a guide part 20. The guide part is provided with a guide hole 21, which is located between the outer cylinder and the inner cylinder. An outer cylinder welding step 22 is formed between the positioning part and the guide part, and an outer cylinder welding recess 23 is formed between the outer cylinder welding step and the outer cylinder. The guide plate is also provided with a molded guide plate reinforcing structure 24, which protrudes on the side facing the rotor and is recessed on the side facing the impeller. An inner cylinder welding step 25 is formed between the guide plate reinforcing boss and the guide part, and the inner cylinder welding step is located between the inner cylinder and the inner cylinder axis. An inner cylinder welding recess 26 is formed between the inner cylinder welding step and the inner cylinder.

[0024] The rear end cover includes a rear end bearing hole 27 for limiting the rear end bearing, and a rear end limiting seat 28 for limiting the inner cylinder. The outer side of the rear end limiting seat fits against the inner side of the inner cylinder to improve the concentricity of the rear end of the inner cylinder and the rotating shaft, as well as the structural strength.

[0025] The front end cover includes a front bearing hole 29 for limiting the front bearing, and a radial elastic sealing ring 30 is provided between the front end cover and the rotating shaft. The outer side of the front end cover fits against the inner side of the inner cylinder, which can improve the concentricity of the front end of the inner cylinder and the rotating shaft and the structural strength. The front end cover is also provided with a support ring 31 that abuts against the bent edge of the front end of the inner cylinder. The support ring can improve the reliability of the welding joint between the inner cylinder and the guide plate, and can also further seal the joint to prevent liquid from flowing into the space where the rotor is located. A liquid accumulation chamber 32 is also provided between the front end cover and the guide plate. The guide plate includes an inner molded structure 33 protruding towards the front end cover. The liquid accumulation chamber is located between the support ring and the inner bent structure. The outer edge of the inner molded structure of the guide plate forms an opening 34 between the liquid accumulation chamber and the front end cover. The liquid that seeps out of the guide chamber will enter the liquid accumulation chamber from the opening under the action of centrifugal force, and will remain in the liquid accumulation chamber under the obstruction of the support ring, thereby preventing the liquid in the guide chamber from entering the rotor inside the inner cylinder. The liquid accumulation cavity is also provided with a reinforcing protrusion 35, which abuts against the guide plate reinforcement structure. The other side of the guide plate reinforcement structure, that is, the side facing the impeller, abuts against the outer wall 36 of the guide cavity. The guide plate reinforcement structure can form a seal on the guide cavity sidewall. At the same time, since the reinforcing protrusion and the guide cavity sidewall are mutually supported by the guide plate reinforcement structure, it is not easy to cause deformation of the guide plate.

[0026] The rotor is also equipped with a mounting block 37 adapted to be installed in the molded structure inside the guide plate, which can form a seal for the guide cavity. An elastic structure 38 is installed between the mounting block and the impeller, which is used to buffer the impact of water flow on the impeller. The elastic structure includes a mounting block abutment seat, an impeller abutment seat, and a spring installed between the mounting block abutment seat and the impeller abutment seat.

[0027] A mounting nut 39 is also installed on one end of the rotating shaft located inside the impeller. The mounting nut is used to abut against the various structures on the rotating shaft located in front of the guide plate, thereby fully fixing them. A toothed washer 40 is also installed between the mounting nut and the impeller. The toothed washer has teeth on its axial end face facing the mounting nut. Compared with ordinary flat washers or spring washers, it will undergo significant deformation after installation. Under the same installation torque, it can improve the stability of the shaft end nut connection and avoid deformation of the guide plate due to excessive installation torque.

[0028] In the assembly process of the structure of this application, the outer cylinder and the inner cylinder are first pre-fixed to the guide plate. Then, the connection between the rear bent edge of the outer cylinder and the rear bent edge of the inner cylinder is welded. Next, the connection between the front bent edge of the inner cylinder and the guide plate, and the connection between the front bent edge of the outer cylinder and the guide plate are welded. Then, the outlet valve is welded to the outlet. Next, the two ends of the rotating shaft with the rotor are respectively fitted with a front end cover with a front end bearing and a rear end cover with a rear end bearing, and a radial elastic sealing ring is installed in the front end cover. Then, the assembled structure is installed into the inner cylinder, and one end of the rotating shaft passes through the guide plate. Then, the guide cavity sidewall, the mounting block, the elastic structure, and the impeller are sequentially installed in front of the guide plate, and finally fixed with the mounting nut.

Claims

1. A pump body structure with high sealing performance, characterized in that, The outer cylinder, the inner cylinder and the flow guide plate are included, the outer flow channel is formed between the outer cylinder and the inner cylinder, the water outlet is arranged on the outer cylinder, the outer cylinder includes the outer cylinder front end bending edge and the outer cylinder rear end bending edge respectively located at two ends, the inner cylinder includes the inner cylinder front end bending edge and the inner cylinder rear end bending edge respectively located at two ends, the outer cylinder front end bending edge and the inner cylinder front end bending edge are welded with the flow guide plate, the outer cylinder rear end bending edge and the inner cylinder rear end bending edge are welded, the flow guide plate includes the positioning part and the flow guide part, the outer cylinder welding step is formed between the positioning part and the flow guide part, the outer cylinder welding notch is formed between the outer cylinder welding step and the outer cylinder.

2. The pump body structure according to claim 1, wherein The bending direction of the outer cylinder front end bending edge is the direction away from the axis of the outer cylinder, and the welding seam between the outer cylinder front end bending edge and the flow guide plate is located away from the axis of the outer cylinder, the bending direction of the inner cylinder front end bending edge is the direction towards the axis of the inner cylinder, and the welding seam between the inner cylinder front end bending edge and the flow guide plate is located close to the axis of the inner cylinder.

3. The pump body structure according to claim 1, wherein The flow guide hole is arranged on the flow guide part, and the position of the flow guide hole is located between the outer cylinder and the inner cylinder.

4. The pump body structure according to claim 1, wherein The inner cylinder welding step is further arranged on the flow guide plate, the position of the inner cylinder welding step is located between the inner cylinder and the axis of the inner cylinder, and the inner cylinder welding notch is formed between the inner cylinder welding step and the inner cylinder.

5. The pump body structure according to claim 1, wherein The outer cylinder rear end bending edge is located on the side outside the outer flow channel relative to the inner cylinder rear end bending edge.

6. The pump body structure according to claim 5, wherein The welding seam between the outer cylinder rear end bending edge and the inner cylinder rear end bending edge is located on the side outside the outer flow channel.

7. The pump body structure according to claim 1, wherein The bending angle of the outer cylinder rear end bending edge is greater than 90°, and the inner cylinder rear end bending edge is attached to the outer cylinder rear end bending edge.

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