High-strength motor shaft structure
By designing the transition inclined connection between the flat shaft section and the cylindrical section in the pump motor shaft, the problems of stress concentration and poor sealing installation of the existing motor shaft are solved, and the strength and sealing installation of the motor shaft are improved. Accuracy, reducing the risk of breakage and water leakage.
Patent Information
- Application Number
- CN202420801178.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-17
AI Technical Summary
The chamfered sections of the existing pump motor shaft can easily lead to stress concentration, resulting in an increased risk of breaking the motor shaft, and poor mechanical seal installation may cause water leakage.
Design a high-strength motor shaft structure, which uses the transition inclined surface between the flat shaft section and the cylindrical section. The transition inclined surface consists of symmetrical arc surfaces and planes, and the positioning surface and transition section are set. The machine seal is on the positioning surface through the moving ring seat. Press and install and set chamfers at the inner hole to avoid transition sections.
It reduces the stress concentration point, improves the strength of the motor shaft and the installation guidance of the mechanical seal, and reduces the risk of fracture and the probability of water leakage.
Smart Images
Figure CN222215398U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of motor shafts for pumps, in particular to a high-strength motor shaft structure. Background Art
[0002] like Figure 1 , 2 As shown in the figure, it is an existing pump motor shaft, the diameters of the two ends are different (φC' and φD' respectively), and the φC' section and the φD' section are transitioned by the chamfer section H, which plays a guiding role in the installation of the mechanical seal. The plane A' at the root of the flat shaft is used as the mechanical seal installation surface, and the root of the axial positioning surface (plane A') is generally required to be a root-cleared right angle in order to cooperate with the mechanical seal. Since the chamfer section H is easy to be processed incompletely, and the root of the plane A' is a stress concentration structure, when the motor shaft is subjected to greater stress, it is easy to break at these two positions.
[0003] Terminology explanation:
[0004] Centrifugal pump: refers to a pump that transports liquid by the centrifugal force generated by the rotation of the impeller;
[0005] Motor shaft: It is the energy conversion device of the centrifugal pump. The impeller and seal of the centrifugal pump are installed on the motor shaft. The motor rotates to drive the impeller through the motor shaft to transport the liquid.
[0006] Mechanical seal: A mechanical seal is a device that prevents fluid leakage by at least one pair of end faces perpendicular to the axis of rotation, which remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of auxiliary seals. Utility Model Content
[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a high-strength motor shaft structure, increase the strength of the motor shaft, and solve the risk of motor shaft breakage caused by stress concentration in the motor shaft structure, while increasing the guidance of the machine seal installation.
[0008] The purpose of the utility model is achieved through the following technical solutions: this high-strength motor shaft structure includes a motor shaft body and a mechanical seal assembled on the motor shaft body, one end of the motor shaft body is a flat shaft section, the other end is a cylindrical section, a transition slope is arranged at the connection between the flat shaft section and the cylindrical section, the flat shaft section is composed of two symmetrical arcuate surfaces and a plane connected between the arcuate surfaces, a positioning surface is arranged at a position corresponding to the plane on the transition slope, the positioning surface is perpendicular to the plane and a transition section is arranged between the two; the mechanical seal presses the mechanical seal transmission ring through the dynamic ring seat and positions it on the positioning surface of the motor shaft body.
[0009] As a further technical solution, the angle between the transition slope and the horizontal plane is α, and α is 10° to 20°.
[0010] As a further technical solution, the positioning surface is arranged at a position of 30% to 70% of the axial width of the transition slope.
[0011] As a further technical solution, the transition section is rounded or chamfered.
[0012] As a further technical solution, the inner hole of the mechanical seal transmission ring matches the shape of the flat shaft segment to achieve rotational torque transmission.
[0013] As a further technical solution, the inner hole opening is provided with a chamfer to avoid the transition section of the motor shaft body.
[0014] As a further technical solution, when the mechanical seal is assembled with the motor shaft body, it is guided by a transition slope and axially positioned with the motor shaft body by a positioning surface.
[0015] The beneficial effects of the utility model are:
[0016] 1. Compared with the existing structure, the transition of the motor shaft is smoother, and a transition section is set (i.e. the plane and the positioning surface transition through a rounded corner), which reduces stress concentration points and reduces the risk of shaft breakage;
[0017] 2. The area of the positioning surface used for axial positioning is increased, which improves the strength of this position and makes the positioning more accurate and reliable during assembly.
[0018] 3. The setting of the transition slope makes the mechanical seal installation more guided, which is conducive to the installation of the mechanical seal and reduces the risk of water leakage caused by poor installation. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the main structure of the prior art.
[0020] Figure 2 It is a schematic diagram of the top view structure of the prior art.
[0021] Figure 3 It is a three-dimensional structural schematic diagram of the utility model.
[0022] Figure 4 It is a schematic diagram of the main structure of the utility model.
[0023] Figure 5 It is a schematic diagram of the top structure of the utility model.
[0024] Figure 6 It is a three-dimensional structural schematic diagram of the utility model after being assembled with the housing.
[0025] Figure 7It is a side view structural schematic diagram of the utility model after being assembled with the housing.
[0026] Figure 8 It is a schematic diagram of the main structure of the utility model after being assembled with the machine package.
[0027] Fig. 9 for Figure 8 AA section view.
[0028] Fig.10 for Fig. 9 A partial enlarged schematic diagram of the middle P area.
[0029] Fig.11 for Fig. 9 BB cross-sectional view.
[0030] Fig.12 for Fig.11 Schematic diagram of a partial enlargement of the middle Q region.
[0031] Fig.13 It is a structural schematic diagram of the mechanical seal transmission ring in the utility model.
[0032] Fig.14 for Fig.13 CC cross-sectional view.
[0033] Explanation of the accompanying reference numerals: motor shaft body 1, flat shaft section 11, arc surface 111, plane 112, cylindrical section 12, transition slope 13, positioning surface 14, transition section 15, machine seal 2, machine seal transmission ring 21, dynamic ring seat 22, inner hole 23, chamfer 24. DETAILED DESCRIPTION
[0034] The utility model will be described in detail below with reference to the accompanying drawings:
[0035] Example: As shown in the attached Figures 3 to 14 As shown, this high-strength motor shaft structure includes a motor shaft body 1, a flat shaft section 11, an arc surface 111, a plane 112, a cylindrical section 12, a transition slope 13, a positioning surface 14, a transition section 15, a mechanical seal 2, a mechanical seal transmission ring 21, a dynamic ring seat 22, an inner hole 23 and a chamfer 24.
[0036] Reference Figure 3 , 45. The left end of the motor shaft body 1 is a flat shaft section 11, and the right end is a cylindrical section 12. A transition slope 13 is set at the connection between the flat shaft section 11 and the cylindrical section 12. The angle between the transition slope 13 and the horizontal plane is α, and α is preferably 10° to 20°. The flat shaft section 11 is composed of two symmetrical arc surfaces 111 and two planes 112 connected between the arc surfaces 111. A positioning surface 14 is set at a position corresponding to the plane 112 on the transition slope 13. Preferably, the positioning surface 14 is set at a position of 30% to 70% of the axial width of the transition slope 13. The positioning surface 14 is perpendicular to the plane 112, and a transition section 15 is set between the two for transition. Preferably, the transition section 15 adopts rounded corners or chamfers.
[0037] like Figures 9 to 12 As shown, when the mechanical seal 2 is assembled with the motor shaft body 1, the mechanical seal 2 is guided by the transition slope 13 and axially positioned with the motor shaft body 1 by the positioning surface 14. The mechanical seal 2 presses the mechanical seal transmission ring 21 through the dynamic ring seat 22 and axially positions it on the positioning surface 14 of the motor shaft body 1.
[0038] Reference Figure 6 , 7 , 13, 14, the inner hole 23 of the mechanical seal transmission ring 21 matches the shape of the flat shaft section 11, and the two sides of the inner hole 23 cooperate with the plane 112 to realize the rotation torque transmission. In addition, the inner diameter of the arc-shaped part of the inner hole 23 plays a radial positioning role. Preferably, a chamfer 24 is set at the mouth of the inner hole 23 to avoid the transition section 15 (rounded corner) of the motor shaft body 1.
[0039] The working process of the utility model is as follows: during assembly, the flat shaft section 11 of the motor shaft body 1 is gradually extended into the mechanical seal 2 along the axial direction, and the transition slope 13 on the motor shaft body 1 plays a guiding role, which is conducive to the installation of the mechanical seal and reduces the risk of water leakage caused by poor installation. At the same time, the positioning surface 14 on the transition slope 13 plays an axial positioning role, and the mechanical seal 2 presses the mechanical seal transmission ring 21 tightly against the positioning surface 14 of the motor shaft body 1 through the dynamic ring seat 22. At this time, the chamfer 24 on the mechanical seal transmission ring 21 plays a role in avoiding the transition section 15 (rounded corner) of the motor shaft body 1 to avoid interference.
[0040] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and the concept of the utility model should fall within the protection scope of the claims attached to the utility model.
Claims
1. A high-strength motor shaft structure, characterized in that: The invention comprises a motor shaft body (1) and a mechanical seal (2) assembled on the motor shaft body (1), wherein one end of the motor shaft body (1) is a flat shaft section (11) and the other end is a cylindrical section (12), a transition slope (13) is arranged at the connection between the flat shaft section (11) and the cylindrical section (12), the flat shaft section (11) is composed of two symmetrical arcuate surfaces (111) and a plane (112) connected between the arcuate surfaces (111), a positioning surface (14) is arranged at a position corresponding to the plane (112) on the transition slope (13), the positioning surface (14) is perpendicular to the plane (112) and a transition section (15) is arranged between the two for transition; the mechanical seal (2) presses and positions the mechanical seal transmission ring (21) on the positioning surface (14) of the motor shaft body (1) through a dynamic ring seat (22).
2. The high-strength motor shaft structure according to claim 1, characterized in that: The angle formed between the transition slope (13) and the horizontal plane is α, and α is 10° to 20°.
3. The high-strength motor shaft structure according to claim 1, characterized in that: The positioning surface (14) is arranged at a position of 30% to 70% of the axial width of the transition slope (13).
4. The high-strength motor shaft structure according to claim 1, characterized in that: The transition section (15) is rounded or chamfered.
5. The high-strength motor shaft structure according to claim 1, characterized in that: The inner hole (23) of the mechanical seal transmission ring (21) matches the shape of the flat shaft section (11) to achieve rotational torque transmission.
6. The high-strength motor shaft structure according to claim 5, characterized in that: The mouth of the inner hole (23) is provided with a chamfer (24) for avoiding the transition section (15) of the motor shaft body (1).
7. The high-strength motor shaft structure according to claim 1, characterized in that: When the mechanical seal (2) is assembled with the motor shaft body (1), it is guided by the transition inclined surface (13) and axially positioned with the motor shaft body (1) by the positioning surface (14).