Rectangular spline connecting structure for improving coaxiality of long shaft extension water pump
By adopting a rectangular spline connection structure in the coupling of marine water pumps, the problem of high accuracy requirements for the long-axis spline shaft and sleeve coupling is solved, and the effect of reducing stress concentration and cost reduction is achieved, and the coaxiality and connection stability of the pump group are improved.
Patent Information
- Application Number
- CN202422105030.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-05-20
- Estimated Expiration
- 2034-08-29
AI Technical Summary
In marine water pumps, when the long shaft is extended, the machining accuracy requirements of the spline shaft and sleeve coupling in the coupling are high, resulting in an increase in manufacturing and management costs. At the same time, the flexural phenomenon is easily caused when the shaft is extended for a long time, affecting the life and performance of the pump group.
The rectangular spline connection structure is adopted. By setting rectangular splines and spline grooves on the spline shaft body and sleeve coupling, stress concentration is reduced, and rectangular splines are made through a right-angle process, which reduces accuracy requirements and manufacturing costs.
It effectively reduces stress concentration, reduces load capacity, protects motor bearings, improves the coaxiality and connection stability of the pump group, and reduces manufacturing and labor costs.
Smart Images
Figure CN222887154U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of spline connection methods, in particular to a rectangular spline connection structure for improving the coaxiality of a long shaft extension water pump. Background Technique
[0002] Marine water pumps are a highly versatile mechanical equipment and are more importantly the guarantee equipment for the safe navigation of ships. They are widely used in the fire fighting system, ballast system, bilge drainage system, domestic water supply system, seawater desalination system, cargo liquid system, etc. of ships. These systems generally use centrifugal pumps as the working machines and pipelines as the devices for extracting and transporting media. The common connection methods between the pump shaft and the motor shaft of the pump set are, one is to directly adopt the design of an extended shaft at the motor end, and the pump and the motor share the same shaft; the other is to connect the pump shaft and the motor shaft through a coupling. For the pump set connected by a coupling, when the shaft extension is relatively long, there will be a slight deflection phenomenon. When the machining accuracy is insufficient or the power of the pump set is relatively large, the deflection phenomenon is often more serious. The deflection phenomenon generated inside the pump set has more or less an impact on the life and performance of the pump set.
[0003] During the operation of the pump set, the pump shaft and the motor shaft are connected through the spline shaft and the sleeve coupling in the coupling, and the motor drives the pump shaft at one end of the coupling to rotate together, and transmits motion and torque, so as to compensate for the offset between the two shafts due to inaccurate manufacturing and installation, deformation during operation or thermal expansion, etc., including axial offset, radial offset, angular offset or comprehensive offset, as well as functions such as relieving shock and absorbing vibration.
[0004] For the pump set connected by a coupling, when the shaft extension is relatively long, there will be a slight deflection phenomenon. When the machining accuracy is insufficient or the power of the pump set is relatively large, the deflection phenomenon is often more serious. The deflection phenomenon generated inside the pump set has more or less an impact on the life and performance of the pump set. Therefore, in order to avoid this problem, the machining accuracy requirements for the spline shaft and the sleeve coupling in the coupling are very high, which increases problems such as manufacturing costs and management costs. Content of the Utility Model
[0005] Based on this, the purpose of the utility model is to provide a rectangular spline connection structure for improving the coaxiality of a long shaft extension water pump, so as to solve the technical problems mentioned in the above background technique.
[0006] To achieve the above object, the present utility model provides the following technical solution: A rectangular spline connection structure for improving the coaxiality of a long-shaft extension pump, including a spline shaft body and a sleeve coupling. On the outer wall of one end of the spline shaft body, a plurality of rectangular splines are equidistantly installed along the circumference. The outer surface of the other end of the spline shaft body is a cylindrical surface. The middle part of the sleeve coupling has an installation groove. On the inner wall of one end of the sleeve coupling, a second key groove is opened, and the second key groove communicates with the inside of the installation groove. On the inner wall of the other end of the sleeve coupling, a spline groove is opened that matches one end of the rectangular spline.
[0007] By adopting the above technical solution, when the sleeve coupling is assembled at one end of the spline shaft body, the rectangular splines on the outer wall of one end of the spline shaft body are aligned with the spline groove at one end of the sleeve coupling, and it is inserted into the inside of the spline groove to complete the installation between the spline shaft body and the sleeve coupling. Since the rectangular spline is a rectangular structure and the spline groove matches the rectangular spline, compared with the existing arc-shaped splines, its structure can effectively reduce stress concentration, and for pump groups with large power, large torque, and large axial force, it can better reduce the load, and at the same time can better protect the motor bearings.
[0008] The present utility model is further arranged such that first key grooves are opened on the outer walls at both ends of the spline shaft body, and the length of the first key grooves is 110 mm.
[0009] By adopting the above technical solution, through the setting of the two first key grooves, the coupling at the motor end still adopts the structure of a conventional sleeve, and the installation position of the sleeve on the spline shaft can be appropriately adjusted according to the size and length of the sleeve, so that the entire device can be adapted to motors of various structures, facilitating the selection of motors.
[0010] The present utility model is further arranged such that the included angles between the two sides of the plurality of rectangular splines and the outer wall of the spline shaft body are 90 degrees, and the number of the rectangular splines is eight.
[0011] By adopting the above technical solution, the rectangular splines are made by a right-angle process, making the rectangular splines a rectangular structure. Compared with common involute splines, the processing process of rectangular splines is simpler and the accuracy requirements are lower, making it more convenient and faster for general manufacturers to process. At the same time, it also reduces the manufacturing cost to a certain extent, is more convenient and faster for the assembly of the device, saves labor costs, and obtains higher economic benefits during the production process.
[0012] The present utility model is further arranged such that the two sides of the inner wall of the spline groove are set as vertical surfaces that match the two sides of the rectangular spline.
[0013] By adopting the above technical solution, after one end of the spline shaft body is assembled at the other end position of the sleeve coupling, and right-angle machining is adopted on both sides of the rectangular spline to cooperate with the vertical surfaces on both sides of the inner wall of the spline groove, the structure can effectively reduce stress concentration, and can better reduce the load for pump sets with large power, large torque and large axial force.
[0014] The present utility model is further configured such that the clearance between the inner wall of the spline groove and the tooth top of the mating rectangular spline is 0.2 mm to 0.6 mm.
[0015] By adopting the above technical solution, after the rectangular spline is assembled inside the spline groove, the rectangular spline adopts a small-diameter centering method, which helps to ensure the centering accuracy during non-coaxial connection, making the concentricity of the pump set higher during operation, the connection more stable and reliable, and significantly reducing the deflection situation.
[0016] The present utility model is further configured such that the number of the spline grooves is equal to the number of the rectangular splines, and a plurality of the spline grooves are equidistantly arranged along the circumference on the inner wall of the other end of the sleeve coupling.
[0017] By adopting the above technical solution, the number of the spline grooves is equal to the number of the rectangular splines, so that eight rectangular splines correspond to eight spline grooves one by one.
[0018] The present utility model is further configured such that symmetric threaded grooves are provided on the outer wall of the other end of the sleeve coupling, and the aperture size of the threaded grooves is 10 mm.
[0019] By adopting the above technical solution, the sleeve coupling can be installed and fixed through two symmetric threaded grooves.
[0020] The present utility model is further configured such that a spiral groove is provided on the surface of one end of the sleeve coupling, and one end of the spiral groove is communicated with the inside of the installation groove.
[0021] By adopting the above technical solution, through the setting of the spiral groove, it can be realized to be close to the adjacent parts during assembly, ensuring the tight connection and normal operation between mechanical components.
[0022] In summary, the present utility model mainly has the following beneficial effects:
[0023] 1. By setting components such as the spline shaft body, rectangular spline and spline groove, since the rectangular spline is made by a right-angle process, the rectangular spline has a rectangular structure. Compared with the common involute spline, the processing process of the rectangular spline is simpler, the accuracy requirement is lower, making it more convenient and faster for general manufacturers to process, and also reducing the manufacturing cost to a certain extent. It is also more convenient and faster for the assembly of the equipment, saving labor costs and obtaining higher economic benefits during the production process;
[0024] 2. By setting components such as a spline shaft body, a rectangular spline, and a spline groove, after the installation between the spline shaft body and the sleeve coupling is completed, since the rectangular spline has a rectangular structure and the spline groove is matched with the rectangular spline, compared with the existing arc-shaped spline, its structure can effectively reduce stress concentration. For pump sets with large power, large torque, and large axial force, it can better reduce the load, and at the same time, it can better protect the motor bearing. Moreover, the connection accuracy of the rectangular spline is higher, which can ensure the rotational accuracy and position accuracy between the pump shaft and the motor shaft, making the structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 is the front view schematic diagram of the present utility model;
[0026] Figure 2 is the front sectional view schematic diagram of the present utility model;
[0027] Figure 3 is the left view schematic diagram of the present utility model;
[0028] Figure 4 is the right view schematic diagram of the present utility model.
[0029] In the figure: 1. Spline shaft body; 101. First keyway; 2. Rectangular spline; 3. Sleeve coupling; 301. Installation groove; 302. Second keyway; 4. Spline groove. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.
[0031] Next, the embodiments of the present utility model will be described according to the overall structure of the present utility model.
[0032] A rectangular spline connection structure for improving the coaxiality of a long-shaft extension water pump, as Figure 1 - Figure 4As shown in the figure, it includes a spline shaft body 1 and a sleeve coupling 3. On the outer wall of one end of the spline shaft body 1, a plurality of rectangular splines 2 are equidistantly installed along the circumference. The outer surface of the other end of the spline shaft body 1 is a cylindrical surface. The middle part of the sleeve coupling 3 has an installation groove 301. On the inner wall of one end of the sleeve coupling 3, a second key groove 302 is opened, and the second key groove 302 is communicated with the inside of the installation groove 301. On the inner wall of the other end of the sleeve coupling 3, a spline groove 4 is opened which is matched with one end 201 of the rectangular spline 2. When the sleeve coupling 3 is assembled on one end of the spline shaft body 1, align the rectangular splines 2 on the outer wall of one end of the spline shaft body 1 with the spline groove 4 at one end of the sleeve coupling 3, and insert it into the inside of the spline groove 4 to complete the installation between the spline shaft body 1 and the sleeve coupling 3. Since the rectangular spline 2 is a rectangular structure and the spline groove 4 is matched with the rectangular spline 2, compared with the existing arc-shaped splines, its structure can effectively reduce stress concentration, and can better reduce the load for pump sets with large power, large torque and large axial force. At the same time, it can also better protect the motor bearings.
[0033] Please refer to Figure 1 - Figure 2 , on the outer walls at both ends of the spline shaft body 1, first key grooves 101 are opened, and the length of the first key grooves 101 is 110 mm. Through the setting of the two first key grooves 101, the coupling at the motor end still adopts the structure of a conventional sleeve, and the installation position of the sleeve on the spline shaft can be appropriately adjusted according to the size and length of the sleeve, so that the entire device can be adapted to motors of various structures, which is convenient for the selection of motors.
[0034] Please refer to Figure 4 , the included angles between the two sides of the plurality of rectangular splines 2 and the outer wall of the spline shaft body 1 are 90 degrees, and the number of the rectangular splines 2 is eight. The rectangular splines 2 are made by right-angle technology, so that the rectangular splines 2 are rectangular structures. Compared with the common involute splines, the processing process of the rectangular splines is simpler and the precision requirements are lower, which makes it more convenient and faster for general manufacturers to process. At the same time, it also reduces the manufacturing cost to a certain extent, is more convenient and faster for the assembly of the equipment, saves labor costs, and obtains higher economic benefits in the production process.
[0035] Please refer to Figure 4 , the two sides of the inner wall of the spline groove 4 are set as vertical surfaces that are matched with the two sides of the rectangular spline 2. After one end of the spline shaft body 1 is assembled at the position of the other end of the sleeve coupling 3, with the two sides of the rectangular spline 2 processed by right-angle technology and matched with the vertical surfaces on the two sides of the inner wall of the spline groove 4, its structure can effectively reduce stress concentration, and can better reduce the load for pump sets with large power, large torque and large axial force.
[0036] Please refer to Figure 4, the clearance between the inner wall of the spline groove 4 and the tooth top of the mating rectangular spline 2 is 0.2 mm to 0.6 mm. After the rectangular spline 2 is assembled inside the spline groove 4, the rectangular spline adopts the small-diameter centering method, which helps to ensure the centering accuracy during non-coaxial connection, making the concentricity of the pump set higher during operation and the connection more stable and reliable, significantly reducing the deflection situation.
[0037] Please refer to Figure 4. The number of spline grooves 4 is equal to the number of rectangular splines 2. A plurality of spline grooves 4 are equidistantly arranged along the circumference on the inner wall of the other end of the sleeve coupling 3. The equal number of spline grooves 4 and rectangular splines 2 enables eight rectangular splines 2 to correspond to eight spline grooves 4 one by one.
[0038] Please refer to Figure 4 , symmetric thread grooves are provided on the outer wall of the other end of the sleeve coupling 3, and the aperture size of the thread grooves is 10 mm. Through the two symmetric thread grooves, the sleeve coupling 3 can be installed and fixed.
[0039] Please refer to Figure 2 , a spiral groove is provided on the surface of one end of the sleeve coupling 3, and one end of the spiral groove communicates with the inside of the installation groove 301. Through the setting of the spiral groove, it can be realized to be close to the adjacent parts during assembly, ensuring the tight connection and normal operation between mechanical components.
[0040] The working principle of the present utility model is as follows: When connecting the pump shaft and the motor shaft through the coupling, first, when the sleeve coupling 3 is assembled at one end of the spline shaft body 1, align the rectangular spline 2 on the outer wall of one end of the spline shaft body 1 with the spline groove 4 at one end of the sleeve coupling 3, and insert it into the inside of the spline groove 4 to complete the installation between the spline shaft body 1 and the sleeve coupling 3. Then, connect one end of the sleeve coupling 3 with the motor shaft, and connect the other end of the spline shaft body 1 with the pump shaft to complete the installation connection of the pump set. Through the setting of the rectangular spline 2 at one end of the spline shaft body 1, and at the same time, the coupling at the motor end still adopts the structure of a conventional sleeve, while ensuring the high-precision benefits brought by the rectangular spline, the entire equipment can be adapted to various structures of motors, facilitating the selection of motors.
[0041] Although the embodiments of the present utility model have been shown and described, the specific embodiments are only explanations of the present utility model and not limitations thereto. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions and variations without creative contributions to the embodiments according to needs, but as long as they are within the scope of the claims of the present utility model, they are protected by the patent law.
Claims
1. A rectangular spline connection structure for improving the coaxiality of a long shaft extension water pump, comprising a spline shaft body (1) and a sleeve coupling (3), characterized in that: The outer wall of one end of the spline shaft (1) is provided with a plurality of rectangular splines (2) equidistantly mounted along the circumference; the outer surface of the other end of the spline shaft (1) is a cylindrical surface; the middle portion of the sleeve coupling (3) is provided with a mounting groove (301); the inner wall of one end of the sleeve coupling (3) is provided with a second key groove (302), and the second key groove (302) is communicated with the interior of the mounting groove (301); the inner wall of the other end of the sleeve coupling (3) is provided with a spline groove (4) matching with one end (201) of the rectangular spline (2).
2. A rectangular spline connection structure for improving the coaxiality of a long-axis water pump according to claim 1, characterized in that: The outer walls of both ends of the spline shaft (1) are provided with a first keyway (101), and the length of the first keyway (101) is 110 mm.
3. A rectangular spline connection structure for improving the coaxiality of a long-axis water pump according to claim 1, characterized in that: The angles between the two sides of the plurality of rectangular splines (2) and the outer wall of the spline shaft (1) are 90 degrees, and the number of the rectangular splines (2) is eight.
4. A rectangular spline connection structure for improving the coaxiality of a long-axis water pump according to claim 3, characterized in that: Both sides of the inner wall of the spline groove (4) are arranged as vertical surfaces matching with both sides of the rectangular spline (2).
5. A rectangular spline connection structure for improving the coaxiality of a long-axis water pump according to claim 1, characterized in that: The clearance between the inner wall of the spline groove (4) and the tooth top of the matching rectangular spline (2) is 0.2 mm to 0.6 mm.
6. A rectangular spline connection structure for improving the coaxiality of a long-axis water pump according to claim 1, characterized in that: The number of the spline grooves (4) is equal to the number of the rectangular splines (2), and a plurality of the spline grooves (4) are equidistantly arranged along the circumference on the inner wall of the other end of the sleeve coupling (3).
7. A rectangular spline connection structure for improving the coaxiality of a long-axis water pump according to claim 1, characterized in that: The outer wall of the other end of the sleeve coupling (3) is symmetrically provided with thread grooves, and the aperture size of the thread grooves is 10 mm.
8. The rectangular spline connection structure for improving the coaxiality of a long-axis water pump according to claim 1, characterized in that: A spiral groove is provided on the surface of one end of the sleeve coupling (3), and one end of the spiral groove is communicated with the interior of the mounting groove (301).