A cone shaft type shaft mixed flow pump shaft structure convenient to disassemble and assemble
The conical shaft structure design solves the coaxiality and disassembly problems of traditional dry shaft mixed flow pumps, enabling convenient disassembly and efficient assembly, and reducing maintenance costs.
Patent Information
- Application Number
- CN202521999915.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-17
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-17
AI Technical Summary
The coaxiality between the straight shaft and the impeller bore of a traditional dry-type axial mixed-flow pump is difficult to guarantee, resulting in high vibration and noise. Disassembly requires lifting the entire pump body out, leading to high maintenance costs.
It adopts a conical shaft structure, in which the impeller and pump shaft are axially fixed by an outer and inner conical structure, and the coupling is fixed to the pump shaft by a positioning key and a lock nut. The taper range is 1:10.
It improves centering, reduces disassembly difficulty and maintenance costs, increases assembly efficiency, and maintains the H8/h7 fit tolerance system.
Smart Images
Figure CN224679738U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a clamp, specifically to a conical shaft type mixed flow pump shaft structure that features good centering, convenient disassembly, improved pump assembly efficiency, good compatibility, and easy assembly and disassembly. Background Technology
[0002] Traditional dry-type axial mixed-flow pumps generally use a straight shaft connected to the impeller and coupling via a flat key. The fit between the shaft and the impeller and coupling is usually H8 / h7 clearance fit.
[0003] The structure has two major technical defects: (1) the coaxiality of the straight shaft and the impeller hole is difficult to guarantee, resulting in high vibration and noise during operation; (2) the pump body needs to be lifted out as a whole during disassembly, and the shaft is easily deformed by hydraulic equipment or manual knocking, resulting in high maintenance costs.
[0004] There is currently no effective solution to the above problems in the existing technology. Utility Model Content
[0005] To address the aforementioned problems, the main objective of this utility model is to provide a conical shaft type mixed-flow pump shaft structure that offers good centering, convenient disassembly, improved pump assembly efficiency, good compatibility, and ease of assembly and disassembly.
[0006] This utility model solves the above-mentioned technical problems through the following technical solution: a cone-shaft type mixed-flow pump shaft structure that is easy to disassemble and assemble, the cone-shaft type mixed-flow pump shaft structure includes: a pump shaft, an impeller, and a coupling; the impeller is fixed on the pump shaft, and an outer truncated cone structure is provided on the pump shaft at the fixed point between the impeller and the pump shaft, and an outer truncated cone structure is also provided on the pump shaft at the fixed point between the coupling and the pump shaft; the inner hole of the impeller is machined into an inner truncated cone structure with a corresponding taper, and the inner hole of the coupling is machined into an inner truncated cone structure with a corresponding taper.
[0007] In a specific embodiment of this utility model, the impeller and the pump shaft are axially fixed by a positioning key.
[0008] In a specific embodiment of this utility model, the coupling and the pump shaft are axially fixed by a positioning key.
[0009] In a specific embodiment of this utility model, the impeller and the pump shaft are fixed with anti-loosening nuts.
[0010] In a specific embodiment of this utility model, the coupling and the pump shaft are fixed with anti-loosening nuts.
[0011] In specific embodiments of this utility model, the taper range of the outer truncated cone structure is 1:10.
[0012] In a specific embodiment of this utility model, the taper range of the outer truncated cone structure provided on the pump shaft at the fixed point between the impeller and the pump shaft is 1:10.
[0013] In a specific embodiment of this utility model, the taper range of the outer truncated cone structure provided on the pump shaft at the fixing point of the coupling and the pump shaft is 1:10.
[0014] The positive and progressive effects of this utility model are as follows: The easily disassembled and assembled conical shaft mixed-flow pump shaft structure provided by this utility model has the following advantages:
[0015] 1. Improved centering: The self-centering characteristic of the conical surface ensures that the radial deviation is ≤0.02mm / m.
[0016] 2. Easy disassembly: Axial tension is reduced by 60%, no hydraulic tools or hammering are required, maintenance time is reduced to 1 / 3 of the original straight shaft, and no special pulling tools are needed.
[0017] 3. Improved pump assembly efficiency: Because the axial thrust is reduced by 20%, the assembly efficiency will also be greatly improved.
[0018] 4. Good compatibility: Maintains the original H8 / h7 fit tolerance system. Attached Figure Description
[0019] Figure 1 A schematic diagram of the overall structure of this utility model.
[0020] Figure 2 This is a schematic diagram of the pump shaft in this utility model.
[0021] Figure 3 for Figure 1 A magnified view of a portion (point A).
[0022] Figure 4 for Figure 1 A magnified view of a portion (point B).
[0023] Figure 5 for Figure 2 A magnified view of a portion (at point C).
[0024] The following are the names corresponding to the reference numerals in this utility model:
[0025] Figure 1-4 In the middle: 1. Anti-loosening nut; 2. Locating key; 3. Impeller; 4. Pump shaft; 5. Coupling. Detailed Implementation
[0026] The preferred embodiments of this utility model are given below with reference to the accompanying drawings to illustrate the technical solution of this utility model in detail.
[0027] Figure 1 A schematic diagram of the overall structure of this utility model. Figure 2 This is a schematic diagram of the pump shaft in this utility model. Figure 3 for Figure 1 A magnified view of a portion (point A). Figure 4 for Figure 1 A magnified view of a portion (point B), as shown below. Figure 1-4 As shown: This utility model proposes a cone-shaft type mixed-flow pump shaft structure that is easy to disassemble and assemble. The cone-shaft type mixed-flow pump shaft structure includes: a pump shaft 4, an impeller 3, and a coupling 5. The impeller 3 is fixed on the pump shaft 4. An outer truncated cone structure is provided on the pump shaft 4 at the fixing point between the impeller 3 and the pump shaft 4. An outer truncated cone structure is also provided on the pump shaft 4 at the fixing point between the coupling 5 and the pump shaft 4. The inner hole of the impeller 3 is machined into an inner truncated cone structure with a corresponding taper. The inner hole of the coupling 5 is machined into an inner truncated cone structure with a corresponding taper.
[0028] In this invention, the impeller 3 and the pump shaft 4 are axially fixed by the positioning key 2, and the coupling 5 and the pump shaft 4 are axially fixed by the positioning key 2.
[0029] In this utility model, the impeller 3 and the pump shaft 4 are fixed with anti-loosening nuts 1, and the coupling 5 and the pump shaft 4 are fixed with anti-loosening nuts 1.
[0030] The taper range of the outer truncated cone structure in this invention is 1:10. The taper range of the outer truncated cone structure on the pump shaft 4 at the fixing point between the impeller 3 and the pump shaft 4 is 1:10. The taper range of the outer truncated cone structure on the pump shaft 4 at the fixing point between the coupling 5 and the pump shaft 4 is also 1:10. In specific implementation, the above parameter ranges can be adjusted according to requirements.
[0031] Here is a specific example: A certain type of mixed-flow pump has a pump shaft diameter of Φ120mm, a taper design of 1:10, and a total length L=200mm. During assembly, hydraulic tools are used to push the impeller assembly axially, improving the uniformity of contact stress distribution by 40%. During disassembly, a special ejection device is used, reducing the working time to 1 / 3 of the original method.
[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.
Claims
1. A cone-shaft type mixed-flow pump shaft structure that is easy to assemble and disassemble, characterized in that: The easily disassembled conical shaft mixed flow pump shaft structure includes: a pump shaft (4), an impeller (3), and a coupling (5); the impeller (3) is fixed on the pump shaft (4), and an outer truncated cone structure is provided on the pump shaft (4) at the fixed point between the impeller (3) and the pump shaft (4), and an outer truncated cone structure is also provided on the pump shaft (4) at the fixed point between the coupling (5) and the pump shaft (4); the inner hole of the impeller (3) is machined into an inner truncated cone structure with a corresponding taper, and the inner hole of the coupling (5) is machined into an inner truncated cone structure with a corresponding taper.
2. The easily disassembled conical shaft mixed-flow pump shaft structure according to claim 1, characterized in that: The impeller (3) and the pump shaft (4) are axially fixed by a positioning key (2).
3. The easily disassembled conical shaft mixed-flow pump shaft structure according to claim 1, characterized in that: The coupling (5) and the pump shaft (4) are axially fixed by the positioning key (2).
4. The easily disassembled conical shaft mixed-flow pump shaft structure according to claim 1, characterized in that: The impeller (3) and the pump shaft (4) are fixed with anti-loosening nuts (1).
5. The easily disassembled conical shaft mixed-flow pump shaft structure according to claim 1, characterized in that: The coupling (5) and the pump shaft (4) are fixed with anti-loosening nuts (1).
6. The easily disassembled conical shaft mixed-flow pump shaft structure according to claim 1, characterized in that: The taper range of the external truncated cone structure is 1:
10.
7. The easily disassembled conical shaft mixed-flow pump shaft structure according to claim 1, characterized in that: The taper range of the outer truncated cone structure set on the pump shaft (4) at the fixed point between the impeller (3) and the pump shaft (4) is 1:
10.
8. The easily disassembled conical shaft mixed-flow pump shaft structure according to claim 1, characterized in that: The outer truncated cone structure with a taper range of 1:10 is also provided on the pump shaft (4) at the fixing point of the coupling (5) and the pump shaft (4).