Novel multi-section detachable shaft structure capable of being spliced

Abstract

The utility model relates to the technical field of fluid machinery, and discloses a novel multi-section shaft structure capable of being spliced and disassembled, which comprises at least two shaft section units provided with male and female end connecting parts, the bottom ends of the shaft section units are the male end connecting parts, and the top ends of the shaft section units are the female end connecting parts; the two shaft section units are connected through the male end connecting part and the female end connecting part, a conical surface self-centering mechanism is arranged between the male end connecting part and the female end connecting part which are connected, and due to the fact that the shaft section units can be transported and installed in a segmented mode, the deformation problem of a long shaft during transportation is avoided, and the difficulty of field installation and centering is simplified. When local abrasion occurs, only the abraded shaft section unit needs to be replaced, overall replacement is avoided, and material waste is reduced. The shafting length can be flexibly adjusted according to the lift change, and the application range and the flexibility of equipment are improved.

Description

Technical Field

[0001] This utility model relates to the field of fluid machinery technology, specifically to a novel multi-segment detachable shaft structure. Background Technology

[0002] In existing pump equipment, the drive shaft mostly adopts an integral forged structure. This design has the following technical drawbacks:

[0003] Transportation and installation are limited: Long shafts with a length greater than 3 meters are prone to deformation when transported in confined spaces, and on-site installation and alignment are difficult;

[0004] High maintenance costs: partial wear requires complete replacement, resulting in material waste exceeding 60%;

[0005] Poor adaptability to operating conditions: The shaft length cannot be flexibly adjusted according to changes in head;

[0006] Insufficient dynamic stability: Traditional flange connections suffer from cumulative radial runout error, which affects the critical speed. Utility Model Content

[0007] The purpose of this invention is to provide a novel multi-segment detachable shaft structure to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a novel multi-segment detachable shaft structure, comprising at least two shaft segment units with male and female end connection portions, wherein the bottom end of the shaft segment unit is the male end connection portion and the top end of the shaft segment unit is the female end connection portion;

[0009] Two shaft segment units are connected by the male end connection part and the female end connection part. A conical self-centering mechanism is provided between the connected male end connection part and the female end connection part. The conical self-centering mechanism includes a conical boss provided on the male end connection part and a conical groove provided on the female end connection part.

[0010] The male end connection part has an external thread on its outer wall, and the female end connection part has a corresponding internal thread on its inner wall. The external thread and the internal thread form a threaded pair. The male end connection part and the female end connection part are axially connected with the threaded pair through a self-centering mechanism.

[0011] Preferably, an anti-rotation pin is provided through the middle of the shaft segment unit, the length of the anti-rotation pin is greater than the length of the shaft segment unit, and the shaft segment unit is located in the middle of the male end connection part and the female end connection part that are connected.

[0012] Preferably, the shaft segment unit has an axially penetrating lubrication oil passage inside.

[0013] Preferably, the diameter of the lubricating oil passage is 6mm, and it is connected to an external oil injection nozzle. The end of the lubricating oil passage is provided with a self-cleaning filter screen with a mesh diameter of Φ0.5mm and a filtration accuracy of ≤20μm.

[0014] Preferably, the external thread of the male end connection and the internal thread of the female end connection are 55° sealing pipe threads with a thread pitch diameter tolerance of 6H / 6g.

[0015] Preferably, the cone angle of the conical boss and the conical groove is 3°-7°, and the surface roughness Ra ≤ 0.8μm.

[0016] Compared with the prior art, the advantages of this utility model are: it improves the convenience of transportation and installation. Since the shaft segment unit can be transported and installed in sections, it avoids the deformation problem during long shaft transportation and reduces the difficulty of on-site installation alignment.

[0017] This reduces maintenance costs; when there is localized wear, only the worn shaft segment needs to be replaced, avoiding the need for complete replacement and reducing material waste.

[0018] It enhances adaptability to working conditions, allowing for flexible adjustment of shaft length based on head changes, thus improving the equipment's applicability and flexibility.

[0019] Dynamic stability is improved by using a self-centering conical mechanism and a threaded pair to reduce radial runout accumulation error and improve the stability of critical speed.

[0020] To prevent shaft segment rotation, the anti-rotation pin design ensures that the shaft segment unit will not rotate during connection, enhancing the reliability of the connection.

[0021] A lubrication system is provided, with axially connected lubrication channels and external grease nipples, which facilitates the replenishment and replacement of lubricating oil and extends the service life of the equipment.

[0022] The sealing performance is guaranteed by using a 55° sealing pipe thread, which ensures the sealing performance of the connection and prevents leakage.

[0023] The improved connection accuracy is ensured by the tapered angle and roughness design of the tapered boss and tapered groove, which guarantee the precision and stability of the connection. Attached Figure Description

[0024] Figure 1 A schematic diagram of the cross-sectional structure of a multi-axis segment unit connection;

[0025] Figure 2 A schematic diagram of the external structure for connecting multi-axis segment units;

[0026] Figure 3 for Figure 1 A magnified structural diagram of point A in the middle.

[0027] In the figure: 1. Shaft segment unit; 2. Male end connection part; 3. Female end connection part; 4. Tapered boss; 5. Tapered groove; 6. Anti-rotation pin; 7. Lubricating oil passage. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-3 This utility model provides a technical solution: a novel multi-segment detachable shaft structure, which consists of at least two shaft segment units 1, each shaft segment unit 1 is equipped with a male and female end connection part. In particular, the bottom end of each shaft segment unit 1 is designed as a male end connection part 2, while the top end is designed as a female end connection part 3.

[0030] Two shaft segment units 1 are connected through their respective male end connection part 2 and female end connection part 3. During the connection process, a conical self-centering mechanism is formed between the male end connection part 2 and the female end connection part 3. The mechanism includes a conical boss 4 provided on the male end connection part 2 and a conical groove 5 provided on the female end connection part 3.

[0031] Furthermore, the outer wall of the male end connection 2 is specially designed with external threads, while the inner wall of the female end connection 3 is provided with matching internal threads. This combination of external and internal threads forms a threaded pair. Ultimately, through the coordinated operation of the self-centering mechanism and the threaded pair, the male end connection 2 and the female end connection 3 achieve precise axial alignment.

[0032] Specifically, the central portion of shaft segment unit 1 is designed to be permeated by an anti-rotation pin 6. The length of this anti-rotation pin 6 exceeds the length of shaft segment unit 1 itself, ensuring that shaft segment unit 1 can be securely fixed in position during connection. Furthermore, shaft segment unit 1 is located not only at the center of the connected male end connection 2 but also at the center of the female end connection 3. The anti-rotation pin 6, which runs through all shaft segments, adopts an interference fit design, and its length exceeds that of a single shaft segment. When subjected to torque, it forms a distributed shear force transmission. Combined with the tapered-thread composite connection, this reduces the radial runout error of traditional flange structures.

[0033] Furthermore, the internal structure of the shaft segment unit 1 includes an axially continuous lubrication channel 7. This design is intended to ensure that lubricating oil can be effectively delivered to all parts of the shaft segment unit 1, thereby reducing wear and extending service life.

[0034] In detail, the diameter of the lubrication channel 7 is precisely designed to be 6 mm, and it connects to an external grease nipple to provide lubrication to the shaft segment unit 1 periodically or continuously. At the end of the lubrication channel 7, a self-cleaning filter is specially designed. The axial lubrication channel 7 forms a siphon effect through the Φ6 mm main channel, combined with the eddy current separation effect of the Φ0.5 mm self-cleaning filter, achieving online filtration of abrasive particles larger than 20 μm in the lubricating oil. When the shaft system rotates, the centrifugal force field drives the lubricant to form a dynamic oil film along the conical mating area, reducing the coefficient of friction to 0.003-0.005.

[0035] Specifically, the external thread of the male end connection 2 and the internal thread of the female end connection 3 adopt a 55° sealing pipe thread, which provides a good sealing effect. The pitch diameter tolerance of the thread is strictly controlled within 6H / 6g. This precision ensures the tightness and reliability of the connection. The axial preload generated by tightening the 55° sealing pipe thread forms a positioning mechanism.

[0036] Specifically, in the design of the conical boss 4 and the conical groove 5, the cone angle is precisely controlled between 3° and 7°. This design ensures the tightness and stability of the connection. The precise cone angle of 3°-7° generates a radial self-centering effect, eliminating more than 90% of the axial offset error. At the same time, the roughness of the cone surface is controlled at Ra≤0.8μm. Such fine surface treatment not only improves the sealing performance of the contact surface, but also reduces wear and extends the service life.

[0037] Working Principle: This invention employs a segmented, rapid assembly method. Each shaft segment unit 1 achieves precise alignment through a self-centering mechanism on the conical surfaces of the male and female end connections. When the male end conical boss 4 is inserted into the female end conical groove 5, a precise conical angle of 3°-7° generates a radial self-centering effect, eliminating over 90% of the axial misalignment error. Subsequently, tightening the 55° sealing pipe thread generates axial preload, forming a dual positioning mechanism.

[0038] Enhanced dynamic stability is achieved through an interference fit design of the anti-rotation pin 6, which runs through all shaft sections. Its length exceeds that of a single shaft section, creating a distributed shear force transmission when subjected to torque. Combined with a tapered-threaded composite connection, the radial runout error of traditional flange structures is reduced, and the critical speed is increased by more than 30%.

[0039] The intelligent lubrication system utilizes an axial lubrication channel 7 to create a siphon effect through a Φ6mm main channel. This, combined with the vortex separation effect of a Φ0.5mm self-cleaning filter, enables online filtration of abrasive particles larger than 20μm in the lubricating oil. When the shaft rotates, the centrifugal force field drives the lubricant to form a dynamic oil film along the conical mating area, reducing the coefficient of friction to 0.003-0.005.

[0040] The system features adaptive adjustment based on operating conditions, achieving linear adjustment of the shaft length by ±15% through the addition or removal of shaft segment units. Each standard shaft segment has four pre-set anti-rotation pin positioning holes. When the head changes, the shaft length can be quickly reconfigured, and the elastic deformation of the threaded pair, ranging from 0.05 to 0.1 mm, is coordinated to achieve stiffness matching while maintaining coaxiality.

[0041] This structure allows the transport unit length to be controlled within a 2.8m modular segment, increasing on-site assembly efficiency by 4 times, reducing the local maintenance and replacement rate to 12%, and expanding the overall working condition adaptability to a head range of 50-300m.

[0042] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel multi-segment detachable shaft structure, characterized in that: It includes at least two shaft segment units (1) with male and female end connection parts, the bottom end of the shaft segment unit (1) is the male end connection part (2), and the top end of the shaft segment unit (1) is the female end connection part (3). Two shaft segment units (1) are connected by the male end connection part (2) and the female end connection part (3). A conical self-centering mechanism is provided between the male end connection part (2) and the female end connection part (3). The conical self-centering mechanism includes a conical boss (4) provided on the male end connection part (2) and a conical groove (5) provided on the female end connection part (3). The male end connection part (2) has an external thread on its outer wall, and the female end connection part (3) has a corresponding internal thread on its inner wall. The external thread and the internal thread form a threaded pair. The male end connection part (2) and the female end connection part (3) are axially connected to the threaded pair through a self-centering mechanism. An anti-rotation pin (6) is provided through the middle of the shaft segment unit (1). The length of the anti-rotation pin (6) is greater than the length of the shaft segment unit (1). The shaft segment unit (1) is located in the middle of the male end connection part (2) and the female end connection part (3) that are connected. The shaft segment unit (1) is provided with an axially penetrating lubrication oil passage (7). The external thread of the male end connection part (2) and the internal thread of the female end connection part (3) adopt a 55° sealing pipe thread with a thread pitch diameter tolerance of 6H / 6g.

2. The novel multi-segment detachable shaft structure according to claim 1, characterized in that: The diameter of the lubricating oil passage (7) is 6mm and it is connected to the external oil injection nozzle. The end of the lubricating oil passage (7) is provided with a self-cleaning filter screen with a mesh diameter of Φ0.5mm and a filtration accuracy of ≤20μm.

3. The novel multi-segment detachable shaft structure according to claim 1, characterized in that: The cone angle of the conical boss (4) and the conical groove (5) is 3°-7°, and the surface roughness Ra≤0.8μm.

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