Structure for improving stress concentration at shaft shoulder for shield pump
By adding transition fillets and inner chamfers to the rotor shoulder of the canned motor pump, the problem of shoulder fracture caused by stress concentration was solved, reducing maintenance costs and time.
Patent Information
- Application Number
- CN202520613837.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-04-02
AI Technical Summary
Stress concentration at the rotor shoulder of a canned motor pump can lead to fatigue cracks, which can easily cause breakage, resulting in equipment damage and high maintenance costs and difficulties.
Adding transition fillets and inner chamfers to the rotor shaft shoulder, and eliminating stress concentration through the combined design of bushings and shaft sleeves, reduces the risk of fracture.
It effectively reduces the possibility of shaft shoulder breakage, thereby reducing maintenance costs and time.
Smart Images
Figure CN223908407U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of shielded electric pump, concretely relates to a structure for improving stress concentration at shaft shoulder for shielded pump. BACKGROUND
[0002] As a special pump, the shielded pump has a unique structural form, one of which is that the shielded pump generally uses sliding bearings, and in order to overcome the shaft thrust generated by the impeller, a thrust disc is added at the sliding bearing to withstand the shaft thrust to a certain extent. In the conventional structure in the past, the thrust disc is usually axially positioned by the shaft shoulder, which is simple in structure, but has certain safety hazards in actual use. The shaft shoulder of the rotor shaft is a place where the shaft diameter changes sharply, and stress concentration may occur. Stress concentration may cause fatigue cracks in the object, so that the shaft shoulder becomes a weak point for transmitting torque. When the torque is large or the operating condition is unstable, the shaft shoulder is prone to breakage, which causes great damage to the on-site equipment. Moreover, the maintenance cost is high, the maintenance difficulty is great, and the maintenance period is long. SUMMARY
[0003] The utility model aims at overcoming the above-mentioned insufficient problem, and provides a structure for improving stress concentration at shaft shoulder for shielded pump.
[0004] The utility model adopts the technical scheme of:
[0005] A structure for improving stress concentration at shaft shoulder for shielded pump, comprising a rotor shaft, a thrust disc is sleeved on the rotor shaft, a bushing is arranged between one end of the thrust disc and the shaft shoulder of the rotor shaft, the bushing is sleeved on the rotor shaft, an axle sleeve and a bearing are arranged at the other end of the thrust disc, the axle sleeve and the bearing are sequentially sleeved on the rotor shaft, and a transition fillet is processed at the shaft shoulder diameter transition position corresponding to the bushing of the rotor shaft.
[0006] An inner chamfer is processed at one end of the shaft shoulder of the rotor shaft where the bushing is located, and the inner chamfer corresponds to the transition fillet.
[0007] The utility model has the characteristics that the transition fillet is greatly increased at the shaft shoulder of the rotor shaft, the influence of stress concentration is eliminated, the possibility of shaft shoulder breakage is reduced, and the maintenance cost and maintenance time are reduced. BRIEF DESCRIPTION OF DRAWINGS
[0008] Figure 1 The utility model is a structural schematic diagram.
[0009] Figure 2 The utility model is a structural schematic diagram. Figure 1 The utility model is a structural schematic diagram.
[0010] Wherein: 1, rotor shaft 2, shaft sleeve 3, bearing 4, thrust disc 5, bushing 6, transition fillet 7, inner chamfer. DETAILED DESCRIPTION
[0011] As Figure 1 , 2 The utility model discloses a structure for improving stress concentration at the shaft shoulder of a shield pump, which comprises a rotor shaft 1, a thrust disc 4 sleeved on the rotor shaft 1, a bushing 5 arranged between one end of the thrust disc 4 and the shaft shoulder of the rotor shaft 1, the bushing 5 being sleeved on the rotor shaft 1, an axle sleeve 2 and a bearing 3 arranged at the other end of the thrust disc 4, the axle sleeve 2 and the bearing 3 being sequentially sleeved on the rotor shaft 1, the outer diameter of the thrust disc 4 being greater than the outer diameter of the bearing 3, a transition fillet 6 being formed on the shaft shoulder of the rotor shaft 1 corresponding to the bushing 5, and an inner chamfer 7 being formed on the shaft shoulder of the rotor shaft 1 corresponding to the bushing 5.
[0012] The utility model discloses a structure for improving stress concentration at the shaft shoulder of a shield pump, which comprises a rotor shaft 1, a thrust disc 4 sleeved on the rotor shaft 1, a bushing 5 arranged between one end of the thrust disc 4 and the shaft shoulder of the rotor shaft 1, the bushing 5 being sleeved on the rotor shaft 1, an axle sleeve 2 and a bearing 3 arranged at the other end of the thrust disc 4, the axle sleeve 2 and the bearing 3 being sequentially sleeved on the rotor shaft 1, the outer diameter of the thrust disc 4 being greater than the outer diameter of the bearing 3, a transition fillet 6 being formed on the shaft shoulder of the rotor shaft 1 corresponding to the bushing 5, and an inner chamfer 7 being formed on the shaft shoulder of the rotor shaft 1 corresponding to the bushing 5.
[0013] The above is only a preferred embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.
Claims
1. A structure for improving stress concentration at the shaft shoulder in a canned motor pump, characterized in that: The device includes a rotor shaft, on which a thrust disc is mounted. A bushing is provided between one end of the thrust disc and the shoulder of the rotor shaft. The bushing is mounted on the rotor shaft. A bushing and a bearing are provided at the other end of the thrust disc. The bushing and the bearing are mounted on the rotor shaft in sequence. A transition fillet is machined at the diameter change point of the shoulder corresponding to the bushing of the rotor shaft.
2. The structure for improving stress concentration at the shaft shoulder used in a canned motor pump as described in claim 1, characterized in that: The bushing has an inner chamfer machined at one end of the rotor shaft shoulder, and the inner chamfer corresponds to the transition fillet.