Motor output shaft sealing structure, motor and machine tool
By setting a main air passage and a branch air passage at the motor output shaft, and using high-pressure gas to form an air curtain, the sealing problem of high-speed motors is solved, achieving IP67 protection level and cooling effect, and improving the overall performance of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI FUTIAN ELECTRIC TECH
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-01
AI Technical Summary
Existing motors have difficulty achieving effective sealing at the output shaft under high-speed conditions, especially failing to reach the IP67 protection level, and neither oil seals nor labyrinth solutions are suitable.
The system employs an air-sealing method, which involves setting a main air passage and multiple branch air passages on the output shaft. High-pressure gas is used to form an air curtain to seal the shaft hole, thereby achieving a high-pressure air curtain and reaching an IP67 protection level.
Under high-speed rotation conditions, the air curtain effectively seals the shaft hole, achieving an IP67 protection rating and providing a cooling effect to improve motor performance.
Smart Images
Figure CN224191746U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor technology, and in particular relates to a motor output shaft sealing structure, a motor, and a machine tool. Background Technology
[0002] As motors are developing towards high speeds, the requirements for their protection levels are also increasing. In commonly used motors, oil seals are generally used to protect the output shaft. However, oil seals can only be used in situations where the motor speed is moderate. Using oil seals in high-speed motors is not suitable, and the labyrinth design cannot achieve the IP67 protection level. Utility Model Content
[0003] In view of the above-mentioned problems existing in the prior art, the purpose of this utility model embodiment is to provide a motor output shaft sealing structure, a motor, and a machine tool. This sealing structure can solve the problem that high-speed motors cannot use oil seals at the output shaft through an air seal method, and can achieve an IP67 protection level well under the action of an air curtain.
[0004] The technical solution adopted in this embodiment of the utility model is:
[0005] A motor output shaft sealing structure includes a body and an output shaft. The front end cover of the body is provided with an output shaft hole, and the first end of the output shaft passes through the output shaft hole and extends out of the body.
[0006] The output shaft is provided with a main air passage and multiple branch air passages that are respectively connected to the outside and the main air passage;
[0007] The main air passage extends along the axial direction of the output shaft, and the plurality of the branch air passages are arranged at circumferential intervals along the output shaft.
[0008] The gas discharged from each of the gas distribution channels can be blown onto the inner wall of the outlet shaft hole and reflected to the outer peripheral wall of the output shaft;
[0009] During rotation, the output shaft enables the gases discharged from each of the gas distribution channels to collectively form an air curtain that seals the output shaft hole.
[0010] In some embodiments, the main air passage is located at the center of the output shaft.
[0011] In some embodiments, the angle between the axis of each of the branch airways and the axis of the main airway is an obtuse angle.
[0012] In some embodiments, the included angles between the axes of the plurality of branch air passages and the axis of the main air passage are equal.
[0013] In some embodiments, the angle between the axis of the branch airway and the axis of the main airway is 110 degrees.
[0014] In some embodiments, the reflection angle formed by the gas discharged from each of the gas distribution channels hitting the inner wall of the outlet shaft hole is an acute angle.
[0015] In some embodiments, the reflection angle formed by the gas discharged from each of the gas distribution channels blowing onto the inner wall of the outlet shaft hole is 20 degrees.
[0016] In some embodiments, the main air passage extends to the end face of the second end of the output shaft;
[0017] The rear end cover of the machine body is provided with a connector, the output shaft can rotate relative to the connector, and the connector is provided with an air intake channel communicating with the main air passage.
[0018] An electric motor includes a body, an output shaft, and a motor output shaft sealing structure as described in any of the above embodiments.
[0019] A machine tool comprising the motor described in any of the above embodiments.
[0020] Compared with the prior art, the beneficial effects of the embodiments of this utility model are as follows:
[0021] The motor output shaft sealing structure of this embodiment can inject high-pressure gas into the main air passage of the output shaft. This high-pressure gas is then discharged from the branch air passages and blown onto the wall of the output shaft hole. During high-speed rotation of the output shaft, the combined discharge from multiple branch air passages forms a high-pressure air curtain that seals the output shaft hole. This effectively solves the sealing problem at the output shaft when oil seals cannot be used in high-speed motors. Furthermore, the high-pressure air curtain effectively achieves an IP67 protection rating. The introduction of compressed air into the air passages also helps to cool the motor to some extent, improving its performance.
[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit the present invention.
[0023] The overview of various implementations or examples of the technology described in this utility model is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description
[0024] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the utility model. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts.
[0025] Figure 1This is a schematic diagram of the motor structure according to an embodiment of the present invention;
[0026] Figure 2 This is a cross-sectional view of the motor in an embodiment of the present invention;
[0027] Figure 3 This is a partial cross-sectional view of the motor in an embodiment of the present utility model;
[0028] Figure 4 This is a schematic diagram of the output shaft structure according to an embodiment of the present invention;
[0029] Figure 5 This is a cross-sectional view of the output shaft in an embodiment of the present invention.
[0030] In the diagram: 1. Body; 11. Front cover; 12. Output shaft hole; 13. Rear cover; 2. Output shaft; 21. Main air passage; 22. Branch air passage; 23. Air curtain; 3. Connector; 31. Connection channel. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0032] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.
[0033] like Figure 1 , Figure 2 Figure 4 and Figure 5As shown, this utility model embodiment provides a motor output shaft sealing structure, the motor mainly includes a body 1 and an output shaft 2.
[0034] The sealing structure mainly includes an outlet shaft hole 12, a main air passage 21, and multiple branch air passages 22 that connect to the outside and the main air passage 21, respectively. The outside can be understood as the area outside the output shaft 2. High-pressure gas injected into the main air passage 21 can be discharged to the outside through the multiple branch air passages 22.
[0035] The output shaft hole 12 is provided on the front end cover 11 of the machine body 1. The first end of the output shaft 2 passes through the output shaft hole 12 on the front end cover 11 and extends out of the machine body 1 for connecting the driven component.
[0036] The main air passage 21 and multiple branch air passages 22 are respectively provided on the output shaft 2. The main air passage 21 extends along the axial direction of the output shaft 2, and the multiple branch air passages 22 are arranged at intervals along the circumference of the output shaft 2. The gas discharged from each branch air passage 22 can be blown to the inner wall of the shaft outlet hole 12 and reflected to the outer peripheral wall of the output shaft 2.
[0037] Since each air duct 22 is used for exhaust, the output shaft 2 rotates synchronously with each air duct 22. The gas discharged from multiple air ducts 22 together forms an air curtain 23 that seals the shaft outlet 12 during the rotation of the output shaft 2. External dust and other debris are prevented from entering the interior of the machine body 1 by the air curtain 23. The air curtain 23 can be understood as a closed surface formed by the flowing gas.
[0038] Because the gas discharged from the air distribution channel 22 can pass through the inner wall of the outlet shaft hole 12 and be reflected onto the outer peripheral wall of the output shaft 2, two layers of air curtain 23 are formed. These two layers of air curtain 23 can effectively perform an air sealing function. Figure 3 As shown.
[0039] The motor output shaft sealing structure of this embodiment can inject high-pressure gas into the main air passage 21 of the output shaft 2. The high-pressure gas is then discharged from the branch air passage 22 and blown onto the wall of the output shaft hole 12. Thus, during the high-speed rotation of the output shaft 2, the gas discharged from multiple branch air passages 22 collectively forms a high-pressure air curtain 23 to seal the output shaft hole 12. This effectively solves the sealing problem at the output shaft when oil seals cannot be used in high-speed motors. Furthermore, the high-pressure air curtain 23 effectively achieves an IP67 protection rating. Additionally, the introduction of compressed air into the air passages can also cool the motor to some extent, improving its performance.
[0040] In some embodiments, the main air passage 21 may be located at the center of the output shaft 2, the axis of the main air passage 21 is coaxial with the axis of the output shaft 2, and a plurality of branch air passages 22 are arranged at circumferential intervals along the main air passage 21 and are arranged radially.
[0041] One end of the main air passage 21 extends to the part of the output shaft 2 opposite to the output shaft hole 12, but does not extend to the end face of the first end of the output shaft 2, thereby ensuring the strength of the part of the output shaft 2 that extends to the outside of the body 1.
[0042] In some embodiments, the angle A between the axis of each branch air passage 22 and the axis of the main air passage 21 can be an obtuse angle. The gas discharged from the branch air passage 22 can be blown obliquely upward to the wall of the outlet shaft hole 12 and reflected onto the outer peripheral wall of the output shaft 2, thereby forming two layers of air curtain 23.
[0043] In some embodiments, the angle A between the axes of the plurality of branch air channels 22 and the axis of the main air channel 21 is equal, thereby ensuring that the gas discharged from the branch air channels 22 can form a symmetrical hood-shaped air curtain 23.
[0044] In some embodiments, the angle A between the axis of the branch airway 22 and the axis of the main airway 21 can be 110 degrees, 120 degrees, or 130 degrees, etc. For example, such as... Figure 3 As shown, the angle A between the axis of the branch airway 22 and the axis of the main airway 21 is 120 degrees.
[0045] In some embodiments, the reflection angle B formed by the gas discharged from each air duct 22 hitting the inner wall of the outlet shaft hole 12 can be an acute angle. For example, the included angle B can be 20 degrees or 30 degrees. For example, ... Figure 3 As shown, the included angle B can be 20 degrees.
[0046] like Figure 1 and Figure 2 As shown, in some embodiments, the rear end cover 13 of the body 1 may be provided with a connector 3, which is fixedly connected to the rear end cover 13, such as by bolts. The output shaft 2 can rotate relative to the connector 3, and the connector 3 has an intake channel 31 that communicates with the main air passage 21. This connector 3 can be connected to a device for generating high-pressure gas, that is, the high-pressure gas output by the device for generating high-pressure gas can enter the main air passage 21 through the intake channel 31, and then be discharged through the distribution channel 22. The structure of the connector 3 is prior art and will not be described in detail.
[0047] For example, such as Figure 2 and Figure 5 As shown, the main air passage 21 can extend to the end face of the second end of the output shaft 2, and the air intake passage 31 in the connector 3 can be directly inserted into the main air passage 21, thereby ensuring that the high-pressure gas entering the air intake passage 31 enters the main air passage 21.
[0048] like Figure 1 and Figure 2As shown, this utility model embodiment also provides a motor, which includes a body 1, an output shaft 2, and the motor output shaft sealing structure described in any of the above embodiments.
[0049] This utility model embodiment also provides a machine tool that can be equipped with the motor described in any of the above embodiments. The motor can be the spindle motor of the machine tool.
[0050] The above description is intended to be illustrative and not restrictive. Those skilled in the art can make variations, modifications, substitutions, and alterations to the above embodiments within the scope of this disclosure. Moreover, the above examples (or one or more of them) can be used in combination with each other, and these embodiments can be combined with each other in various combinations or arrangements.
Claims
1. A motor output shaft sealing structure, the motor comprising a body and an output shaft, characterized in that, The front cover of the machine body is provided with a shaft outlet hole, and the first end of the output shaft extends out of the machine body through the shaft outlet hole. The output shaft is provided with a main air passage and multiple branch air passages that are respectively connected to the outside and the main air passage; The main air passage extends along the axial direction of the output shaft, and the plurality of the branch air passages are arranged at circumferential intervals along the output shaft. The gas discharged from each of the gas distribution channels can be blown onto the inner wall of the outlet shaft hole and reflected to the outer peripheral wall of the output shaft; During rotation, the output shaft enables the gases discharged from each of the gas distribution channels to collectively form an air curtain that seals the output shaft hole.
2. The motor output shaft sealing structure as described in claim 1, characterized in that, The main air passage is located at the center of the output shaft.
3. The motor output shaft sealing structure as described in claim 1, characterized in that, The angle between the axis of each of the branch airways and the axis of the main airway is an obtuse angle.
4. The motor output shaft sealing structure as described in claim 3, characterized in that, The included angles between the axes of the plurality of branch air passages and the axis of the main air passage are equal.
5. The motor output shaft sealing structure as described in claim 3, characterized in that, The angle between the axis of the branch airway and the axis of the main airway is 110 degrees.
6. The motor output shaft sealing structure as described in claim 1, characterized in that, The gas discharged from each of the gas distribution channels forms an acute angle of reflection when it hits the inner wall of the outlet shaft hole.
7. The motor output shaft sealing structure as described in claim 6, characterized in that, The gas discharged from each of the gas ducts is reflected at an angle of 20 degrees to the inner wall of the outlet shaft hole.
8. The motor output shaft sealing structure as described in claim 1, characterized in that, The main air passage extends to the end face of the second end of the output shaft; The rear end cover of the machine body is provided with a connector, the output shaft can rotate relative to the connector, and the connector is provided with an air intake channel communicating with the main air passage.
9. An electric motor, characterized in that, It includes the body, the output shaft, and the motor output shaft sealing structure as described in any one of claims 1-8.
10. A machine tool, characterized in that, Includes the motor as described in claim 9.