Motor end cover, motor shaft system structure and motor

Abstract

The invention provides a motor end cover, a motor shaft system structure and a motor, the motor end cover comprises a mounting part and an end cover shell, and the mounting part is connected with a motor shaft through a bearing; fan blades are further nested on the outer side of the motor shaft; the end cover shell is located on the outer side of the installation part, a heat dissipation cavity is formed between the installation part and the end cover shell, and the heat dissipation cavity is located on one side of the fan blades; the outer side wall of the installation part is provided with flow guide heat dissipation ribs located in the heat dissipation cavity. According to the motor end cover, the heat dissipation cavity and the fan blades are arranged to dissipate heat of the bearing, the motor end cover can be effectively dissipated, the temperature of the bearing at the motor end cover is reduced, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of motor connection structures, and in particular to a motor end cover, a motor shaft system structure and a motor. Background Art

[0002] As a mechanical power source, motors have been widely used in various industries and places. High-power motors have large stator and rotor losses. The rotor losses are transmitted to both ends of the bearings through the shaft, causing the bearings to heat up, thereby reducing the service life of the bearings.

[0003] In the existing motor structure, the D end of the motor, that is, the load end of the motor is directly connected to the load through the front end cover. At the front end cover, the air flow is poor, resulting in high bearing temperature, significantly reduced grease life, and reduced motor operation stability. Summary of the invention

[0004] In order to overcome the problems existing in the related art, one of the purposes of the present invention is to provide a motor end cover, which can dissipate heat at the bearing by setting a heat dissipation chamber and fan blades, thereby effectively dissipating heat at the motor end cover, reducing the bearing temperature at the motor end cover, and increasing the service life of the motor.

[0005] A motor end cover comprises a mounting portion and an end cover housing, wherein the mounting portion is connected to a motor shaft via a bearing; and a fan blade is embedded on the outer side of the motor shaft;

[0006] The end cover shell is located on the outside of the mounting portion, a heat dissipation chamber is formed between the mounting portion and the end cover shell, and the heat dissipation chamber is located on one side of the fan blade; the outer side wall of the mounting portion is provided with guide heat dissipation ribs located in the heat dissipation chamber.

[0007] When the motor shaft rotates, the motor shaft drives the fan blades to rotate. The fan blades stir the air when they rotate. At the same time, the heat dissipation ribs integrate the flowing air so that the flowing air is injected into the heat dissipation chamber in an orderly manner, thereby achieving effective cooling and heat dissipation at the bearings, thereby reducing the temperature of the bearings and the motor end cover, improving the bearing reliability, and thus improving the motor operation stability.

[0008] In a preferred technical solution of the present invention, the heat-guiding radiating rib comprises a fixed end and a suspended end. There are several heat-guiding radiating ribs, and the fixed ends of the several heat-guiding radiating ribs are all fixed on the outer wall of the mounting portion, and the suspended ends of the several heat-guiding radiating ribs extend in a clockwise or counterclockwise direction.

[0009] In the present application, there are multiple flow-guiding heat-dissipating ribs, and the multiple flow-guiding heat-dissipating ribs extend in a rotating shape in the same direction. The fixed end of the flow-guiding heat-dissipating rib is used to fix it on the outer wall of the mounting portion, and the inner side of the mounting portion is connected to the motor shaft through a bearing; the suspended end of the flow-guiding heat-dissipating rib is suspended inside the heat dissipating chamber to guide the air volume. In the present application, the flow-guiding heat-dissipating ribs and the fan blades have a synergistic effect. If there are only fan blades, they can only stir the hot air inside the heat dissipating chamber, and cannot make the hot air rotate in an orderly manner to form an orderly air volume; if there are only flow-guiding heat-dissipating ribs, the hot air inside the heat dissipating chamber cannot be rotated; only when the two are set at the same time, through the rotation of the fan blades and the guiding effect of the flow-guiding heat-dissipating ribs, the hot air transferred from the bearing can be rotated in the heat dissipating chamber in an orderly and uniform manner, so as to improve the heat dissipation efficiency of the hot air and effectively reduce the temperature at the bearing.

[0010] In a preferred technical solution of the present invention, the mounting portion is an annular structure, and the angle between the fixed ends of two adjacent flow-guiding and heat-dissipating ribs ranges from 45° to 60°.

[0011] Since the outer side of the mounting portion is distributed in a circle, a plurality of heat-guiding ribs can be evenly distributed along the circumferential direction of the circle. At the same time, the present application limits the fixed ends of two adjacent heat-guiding ribs to a certain spacing range, thereby ensuring a sufficient number of heat-guiding ribs to guide the air volume inside the heat-dissipating chamber, while also ensuring that too many heat-guiding ribs will not cause processing difficulties, material waste, etc.

[0012] In a preferred technical solution of the present invention, the guiding and heat dissipating rib is an arc-shaped structure, and the angle between the fixed end and the suspended end of the guiding and heat dissipating rib is in the range of 35°-45°.

[0013] In the present application, the guide heat dissipation rib is an arc-shaped structure, which can be understood as a local area in a circle. The length selected in the extension direction corresponds to an angle range of 35°-45° in the circle. This can ensure the rotation arc of the guide heat dissipation rib and accelerate the circulation and diversion of the air volume in the heat dissipation chamber.

[0014] In a preferred technical solution of the present invention, the thickness of the guiding and heat dissipating rib is less than or equal to 3 mm, and the thickness refers to the dimension of the plane perpendicular to the extending direction of the guiding and heat dissipating rib.

[0015] The present application limits the thickness of the heat dissipation ribs to be less than or equal to 3 mm, which can save materials, make the motor end cover lightweight, and facilitate stable operation of the motor.

[0016] In a preferred technical solution of the present invention, an arc transition portion is provided between the end of the heat dissipation chamber away from the fan blades and the side wall of the heat dissipation chamber.

[0017] The reason why the circular arc transition part is set in this application is not necessarily to avoid excessive stress at the connection between the bottom and the side wall of the heat dissipation chamber, which may cause deformation of the heat dissipation chamber structure. When the air volume rotates inside the heat dissipation chamber, stress is most likely to be generated at the connection between the bottom and the side wall of the heat dissipation chamber. The circular arc transition part set in this application can disperse the stress and avoid stress concentration at the connection between the bottom and the side wall of the heat dissipation chamber, which affects the normal use of the motor end cover.

[0018] In a preferred technical solution of the present invention, in the axial direction of the motor shaft, the minimum distance between the fan blade and the end cover shell is L3; the size of the fan blade in the axial direction of the motor shaft is L2, and L2≥2×L3.

[0019] At this distance, a safe operating distance can be maintained between the end cover housing and the fan blades and the protective cover, and during the rotation of the motor shaft, each component can operate stably without interference.

[0020] The second purpose of the present application is to provide a motor shaft system structure, including a motor end cover as described above, wherein a protective cover is provided on the side of the fan blade away from the heat dissipation chamber in the axial direction of the motor shaft, the fan blade is located inside the protective cover, and the protective cover and the end cover shell are connected at opposite ends.

[0021] In the present application, the protective cover is fixedly connected to the motor end cover, and the protective cover can isolate the splashing water and particles around the motor, so that the motor end cover and the motor formed by the motor in the present application have a waterproof function, thereby improving the protection level of the motor end. At the same time, the protective cover can also ensure that when the fan blades rotate, foreign objects are prevented from entering the end cover and interfering with the operation, thereby further improving the stability of the motor operation.

[0022] In a preferred technical solution of the present invention, a first mounting hole is arranged in the end surface of the protective cover close to the end cover shell, and a second mounting hole matching the first mounting hole is arranged in the end surface of the end cover shell close to the protective cover; a plurality of first mounting holes are evenly distributed along the edge of the end surface of the protective cover.

[0023] The first mounting hole and the second mounting hole in the present application can be installed with fasteners such as screws during assembly. The protective cover and the end cover shell are fixed together, which can give full play to the protective effect of the protective cover on the inside of the end cover shell and the fan blades outside the end cover shell. At the same time, the protective cover in the present application is an annular structure, and the first mounting holes are evenly distributed on the edge of the protective cover. The present application can limit the angle range between two adjacent first mounting holes to D3. Since the first mounting hole and the second mounting hole are in a corresponding relationship, that is, the angle range between the second mounting holes in the motor end cover is also D3, and D3=2×D2, this can ensure that the first mounting holes are evenly stressed in the end cover, thereby improving the protective strength of the protective cover.

[0024] The third object of the present application is to provide a motor, comprising a motor shaft system structure as described above.

[0025] The motor end cover can achieve effective cooling and heat dissipation, improving the motor's operating stability and motor life.

[0026] The beneficial effects of the present invention are:

[0027] The present invention provides a motor end cover, comprising a mounting portion and an end cover shell, wherein the mounting portion is connected to the motor shaft through a bearing; a fan blade is also nested on the outside of the motor shaft; the end cover shell is located on the outside of the mounting portion, and a heat dissipation chamber is formed between the mounting portion and the end cover shell, and the heat dissipation chamber is located on one side of the fan blade; the outer wall of the mounting portion is provided with a guide heat dissipation rib located in the heat dissipation chamber. When the motor shaft rotates, the motor shaft drives the fan blade to rotate, and the fan blade stirs the air when rotating. At the same time, the guide heat dissipation rib integrates the wind force of the flowing air, so that the flowing air is injected into the heat dissipation chamber in an orderly manner, achieving effective cooling and heat dissipation of the bearing, thereby reducing the temperature of the bearing and the motor end cover, improving the reliability of the bearing, and thereby improving the running stability of the motor.

[0028] The present application also provides a motor shaft system structure including the above-mentioned motor end cover. Compared with the motor shaft structure in the prior art which does not have a heat dissipation chamber and a guide heat dissipation rib, when the motor shaft rotates, the motor shaft drives the fan blades to rotate, and the fan blades stir the air when rotating. At the same time, the guide heat dissipation ribs integrate the wind force of the flowing air, so that the flowing air is injected into the heat dissipation chamber in an orderly manner, thereby achieving effective cooling and heat dissipation at the bearing. Through the above-mentioned structure, the temperature at the motor end cover position can be reduced by 50%, thereby effectively improving the operating stability of the motor.

[0029] The present application also provides a motor including the above-mentioned motor shaft system structure, which can achieve effective cooling and heat dissipation at the motor end cover, thereby improving the motor operation stability and motor life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the air flow in the motor end cover;

[0031] Figure 2 This is a schematic diagram of the assembly of the motor end cover, fan blades and protective cover;

[0032] Figure 3 It is a structural schematic diagram of the motor end cover;

[0033] Figure 4 This is a schematic diagram of the installation dimensions of the motor end cover;

[0034] Figure 5 It is a structural cross-sectional view of the motor end cover;

[0035] Figure 6 It is a schematic diagram of the structural assembly dimensions of the motor shaft system structure;

[0036] Figure 7 It is a schematic diagram of the structure in which the motor end cover is installed in the motor;

[0037] Figure 8 is a schematic diagram of the structure of the protective cover;

[0038] Fig. 9 A comparison diagram of the heat dissipation efficiency at the bearing position in the motor end cover of the present application and the bearing position in the motor end cover of the prior art;

[0039] Fig.10 This is a comparison chart of the heat dissipation efficiency at the bearing position in the motor shaft of the present application and the bearing position in the motor shaft of the prior art.

[0040] Reference numerals:

[0041] 11. Bearing; 12. Motor shaft; 13. End cover housing; 14. Protective cover; 15. Fan blade; 16. Diversion and heat dissipation ribs; 17. Heat dissipation chamber; 18. Mounting part; 19. First mounting hole; 20. Second mounting hole. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0043] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0044] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0045] Example 1

[0046] like Figure 1-Figure 6 As shown, a motor end cover comprises a mounting portion 18 and an end cover shell 13, wherein the mounting portion 18 is connected to the motor shaft 12 via a bearing 11; a fan blade 15 is also nested on the outside of the motor shaft 12; the end cover shell 13 is located on the outside of the mounting portion 18, a heat dissipation chamber 17 is formed between the mounting portion 18 and the end cover shell 13, and the heat dissipation chamber 17 is located on one side of the fan blade 15; the outer wall of the mounting portion 18 is provided with a guide heat dissipation rib 16 located in the heat dissipation chamber 17.

[0047] In the present application, the motor shaft 12 may specifically be the rotor shaft inside the motor. The heat dissipation chamber 17 and the fan blade 15 are both arranged on the outside of the motor shaft 12, and in the direction of the axis of the motor shaft 12, the heat dissipation chamber 17 is a groove structure that is recessed toward the fan blade 15, that is, the heat dissipation chamber 17 is directly opposite to the fan blade 15. The mounting portion 18 is connected to the motor shaft 12 through the bearing 11. When the motor shaft 12 rotates, the mounting portion 18 and the end cover housing 13 are fixed; and the heat dissipation chamber 17 and the fan blade 15 are combined to dissipate heat at the bearing 11 to reduce the temperature at the position of the bearing 11.

[0048] The motor end cover in the present application can be a motor front end cover or a motor rear end cover. In actual operation, it can be used as a motor front end cover. This is because the front end cover is installed at the motor D end, that is, the motor load end. The existing front end covers without fan blades 15 and heat dissipation chambers 17 are directly nested on the outside of the motor shaft 12 through the bearing 11, which leads to poor air flow, high temperature of the bearing 11, and low grease life at the bearing 11. Therefore, when the motor end cover in the present application is set at the motor D end, the heat dissipation of the bearing 11 can be effectively achieved.

[0049] By the same token, the motor end cover in this application can also be installed at the N end of the motor, that is, the non-load end of the motor, and used as a rear end cover, which can also reduce the temperature of the bearing 11 at the rear end cover position. However, in actual operation, the rear end cover position of the motor is provided with a heat dissipation fan 15, which has a good heat dissipation effect. If the heat dissipation fan 15 cannot meet the heat dissipation requirements of the bearing 11, the motor end cover in this application can be installed at the rear end cover position of the motor and used as a rear end cover.

[0050] The heat dissipation chamber 17 in the present application is to increase the effective area of ​​heat exchange between the bearing 11 and the external environment. Compared with the end cover directly wrapped and sleeved on the outside of the motor shaft 12 in the prior art, the heat dissipation chamber 17 in the present application can ensure that there is a larger heat exchange area between the bearing 11 and the air.

[0051] The function of the fan blade 15 in the present application is to stir the air in the heat dissipation chamber 17. Since the heat dissipation chamber 17 is located outside the bearing 11, if there is no fan blade 15, the heat generated at the position of the bearing 11 needs to be statically transferred to the heat dissipation chamber 17 through the air, and the heat dissipation chamber 17 then exchanges heat with the external environment to achieve heat dissipation. This method only increases the heat dissipation area and cannot further improve the heat dissipation effect. The setting of the fan blade 15 can stir the air inside the heat dissipation chamber 17, so that the hot air inside the heat dissipation chamber 17 flows, and the rotation of the fan blade 15 itself can also achieve the effect of heat dissipation.

[0052] The function of the heat dissipation ribs 16 in the present application is to organize the hot air entering the heat dissipation chamber 17 so that it rotates along the heat dissipation chamber 17 in a certain direction and angle, such as Figure 1 That is to say, the shape of the guiding heat dissipation rib 16 can be set according to the rotation direction of the motor shaft 12, which rectifies the hot air entering the heat dissipation chamber 17 and changes the hot air path, so that the hot air enters the heat dissipation chamber 17 in an orderly manner in a rotating form, and the hot air entering the heat dissipation chamber 17 in sequence will rotate in the heat dissipation chamber 17, which helps to quickly cool down the high temperature air volume inside the heat dissipation chamber 17, thereby achieving effective heat dissipation of the bearing 11.

[0053] In the present application, the guide heat dissipation ribs 16 and the fan blades 15 have a synergistic effect. If there are only fan blades 15, they can only stir the hot air inside the heat dissipation chamber 17, and cannot make the hot air rotate in an orderly manner to form an orderly air volume; if there are only guide heat dissipation ribs 16, the hot air inside the heat dissipation chamber 17 cannot be rotated; only when the two are set at the same time, through the rotation of the fan blades 15 and the guiding effect of the guide heat dissipation ribs 16, the hot air transferred from the bearing 11 will be rotated in the heat dissipation chamber 17 in an orderly and uniform manner, so as to improve the heat dissipation efficiency of the hot air and effectively reduce the temperature at the bearing 11.

[0054] At the same time, the synergistic effect of the guiding heat dissipation ribs 16 and the fan blades 15 is also reflected in that the fan blades 15 can stir the air in the heat dissipation chamber 17 on the plane perpendicular to the motor shaft 12, and can also blow the fan blades 15 and the air in the heat dissipation chamber 17 toward the bottom of the heat dissipation chamber 17. In this way, under the guidance of the guiding heat dissipation ribs 16, the air inside the heat dissipation chamber 17 can rotate in a slightly inclined direction near the bottom of the heat dissipation chamber 17 to form a flow in a two-dimensional direction inside the heat dissipation chamber 17, further improving the heat dissipation efficiency. The two-dimensional direction here refers to the two directions parallel to the axis centerline of the motor shaft 12 and perpendicular to the axis centerline of the motor shaft 12.

[0055] In the present application, when the motor shaft 12 rotates, the motor shaft 12 drives the fan blades 15 to rotate. When the fan blades 15 rotate, they stir the air. At the same time, the heat dissipation ribs 16 integrate the flowing air so that the flowing air is injected into the heat dissipation chamber 17 in an orderly manner, thereby achieving effective cooling and heat dissipation at the bearing 11, thereby reducing the temperature of the bearing 11 and the motor end cover, improving the reliability of the bearing 11, and thus improving the operating stability of the motor.

[0056] Example 2

[0057] like Figure 1-Figure 6 As shown, a motor end cover comprises a mounting portion 18 and an end cover shell 13, wherein the mounting portion 18 is connected to the motor shaft 12 via a bearing 11; a fan blade 15 is also nested on the outside of the motor shaft 12; the end cover shell 13 is located on the outside of the mounting portion 18, a heat dissipation chamber 17 is formed between the mounting portion 18 and the end cover shell 13, and the heat dissipation chamber 17 is located on one side of the fan blade 15; the outer wall of the mounting portion 18 is provided with a guide heat dissipation rib 16 located in the heat dissipation chamber 17.

[0058] The fan blades in the present application may specifically be axial flow fan blades.

[0059] Further, such as Figure 1 and Figure 3 As shown, in the present application, the heat-guiding rib 16 includes a fixed end and a suspended end. There are several heat-guiding ribs 16, and the fixed ends of the several heat-guiding ribs 16 are all fixed on the outer wall of the mounting portion 18, and the suspended ends of the several heat-guiding ribs 16 extend in a clockwise or counterclockwise direction.

[0060] In the present application, there are multiple flow-guiding heat-dissipating ribs 16, and multiple flow-guiding heat-dissipating ribs 16 extend in a rotating shape in the same direction. The fixed end of the flow-guiding heat-dissipating rib 16 is used to fix it on the outer wall of the mounting portion 18, and the inner side of the mounting portion 18 is connected to the motor shaft 12 through the bearing 11; the suspended end of the flow-guiding heat-dissipating rib 16 is suspended inside the heat dissipating chamber 17 to guide the air volume. In the present application, the flow-guiding heat-dissipating rib 16 and the fan blade 15 have a synergistic effect. If there is only the fan blade 15, it can only stir the hot air inside the heat dissipating chamber 17, and it is impossible to make the hot air rotate in an orderly manner to form an orderly air volume; if there is only the flow-guiding heat-dissipating rib 16, it is impossible to make the hot air inside the heat dissipating chamber 17 rotate; only when the two are set at the same time, through the rotation of the fan blade 15 and the guiding effect of the flow-guiding heat-dissipating rib 16, the hot air transferred from the bearing 11 can be rotated in the heat dissipating chamber 17 in an orderly and uniform manner, so as to improve the heat dissipation efficiency of the hot air and effectively reduce the temperature at the bearing 11.

[0061] Please see attached Figure 4 , Figure 4D1 represents the angle range between the fixed end and the suspended end of the guiding and heat dissipating rib 16, that is, the corresponding length of the guiding and heat dissipating rib 16 in its extension direction. D2 represents the angle range between the fixed ends of two adjacent guiding and heat dissipating ribs 16. D3 represents the angle range between the second mounting holes 20 in the motor end cover, and D4 represents the distance between the second mounting hole 20 in the motor end cover and the center of the motor end cover.

[0062] Furthermore, the mounting portion 18 is an annular structure, and the angle range D2 between the fixed ends of two adjacent heat dissipation ribs 16 is 45°-60°. Figure 4 As shown, the angle between the fixed ends of two adjacent guiding and heat dissipating ribs 16 is 45°, that is, eight guiding and heat dissipating ribs 16 are evenly distributed on the outer side wall of the circular mounting portion 18 .

[0063] Since the outer side of the mounting portion 18 is distributed in a circular shape, a plurality of heat-guiding ribs 16 can be evenly distributed along the circumferential direction of the circle. At the same time, the present application stipulates that a certain spacing range is maintained between the fixed ends of two adjacent heat-guiding ribs 16, which can ensure that a sufficient number of heat-guiding ribs 16 are provided to guide the air volume inside the heat-dissipating chamber 17, and at the same time ensure that too many heat-guiding ribs 16 will not cause processing difficulties, material waste, etc.

[0064] Further, such as Figure 4 As shown, the guiding and heat dissipating rib 16 is an arc-shaped structure, and the angle range D1 between the fixed end and the suspended end of the guiding and heat dissipating rib 16 is 35°-45°.

[0065] In the present application, the guide heat dissipation rib 16 is an arc-shaped structure, which can be understood as a local area in a circle. The length selected in the extension direction corresponds to an angle range of 35°-45° in the circle. This can ensure the rotation arc of the guide heat dissipation rib 16 and accelerate the circulation and diversion of the air volume in the heat dissipation chamber 17.

[0066] Please continue reading Figure 4 The distance D4 between the second mounting holes 20 in the motor end cover and the center of the motor end cover can be determined according to the number of the second mounting holes 20 and the angles between them.

[0067] like Figure 5 As shown, Figure 5C1 represents the size of the motor end cover in the direction of the motor shaft 12 axis; C2 represents the size of the heat dissipation chamber 17 in the direction of the motor shaft 12 axis; C3 represents the thickness of the connection between the bottom and the side wall of the heat dissipation chamber 17; C4 represents the thickness of the bottom of the heat dissipation chamber 17; C5 represents the flow path between two adjacent flow-conducting and heat-dissipating ribs 16, which is an inclined plane from the side view, and the angle between the inclined plane and the horizontal plane, that is, the angle between the inclined plane and the horizontal plane parallel to the axis of the motor shaft 12 is greater than 30° and less than or equal to 50°. C6 represents the size of the bearing 11 in the plane perpendicular to the axis of the motor shaft 12. C7 represents the thickness of the flow-conducting and heat-dissipating rib 16.

[0068] Furthermore, the thickness C7 of the guiding and heat dissipating rib 16 is less than or equal to 3 mm, and the thickness refers to the dimension of the plane perpendicular to the extending direction of the guiding and heat dissipating rib 16 .

[0069] The present application stipulates that the thickness of the guide heat dissipation rib 16 is less than or equal to 3 mm, which can save materials, make the motor end cover lightweight, and facilitate stable operation of the motor.

[0070] Further, such as Figure 5 As shown, an arc transition portion is provided between the end of the heat dissipation chamber 17 away from the fan blades 15 and the side wall of the heat dissipation chamber 17 .

[0071] The reason why the circular arc transition part is set in the present application is not necessarily to avoid excessive stress at the connection between the bottom and the side wall of the heat dissipation chamber 17, which may cause deformation of the heat dissipation chamber 17 structure. When the air volume rotates inside the heat dissipation chamber 17, stress is most likely to be generated at the connection between the bottom and the side wall of the heat dissipation chamber 17. The circular arc transition part set in the present application can disperse the stress and avoid stress concentration at the connection between the bottom and the side wall of the heat dissipation chamber 17, which affects the normal use of the motor end cover.

[0072] This application needs to ensure that in the axial direction of the motor shaft 12, the size C1 of the motor end cover is larger than the size of the heat dissipation chamber 17C2. If the size of the heat dissipation chamber 17C2 is larger than the size C1 of the motor end cover, the inner wall of the motor end cover will cause interference friction with other components due to shaft vibration.

[0073] In the present application, the thickness C3 of the connection between the bottom and the side wall of the heat dissipation chamber 17 and the thickness C4 of the bottom of the heat dissipation chamber 17 need to be greater than or equal to 6.5 mm, so as to ensure the structural strength of the motor end cover.

[0074] At the same time, the present application can set the connection between the bottom and the side wall of the heat dissipation chamber 17 as a rounded corner, and the radius of the rounded corner is greater than 0.5 and less than or equal to 2. This can further avoid stress concentration at the connection position between the bottom and the side wall of the heat dissipation chamber 17.

[0075] C5 represents the flow path between two adjacent flow guiding and heat dissipating ribs 16, which is an inclined plane from the side view, and the angle between the inclined plane and the horizontal plane, that is, the angle between the horizontal plane parallel to the axis of the motor shaft 12 is greater than 30° and less than or equal to 50°. This angle setting can effectively and smoothly guide wind and air into the heat dissipating chamber 17 for heat exchange circulation.

[0076] C6 represents the size of the bearing 11 in a plane perpendicular to the axis of the motor shaft 12, and the size value can be actually set according to the motor requirements.

[0077] C7 represents the thickness of the heat-dissipating rib 16. The thickness of the heat-dissipating rib 16 is less than or equal to 3 mm, which can save materials, make the motor end cover lightweight, and facilitate stable operation of the motor.

[0078] In this embodiment, the motor end cover is installed at the front end of the motor and used as a front end cover. At the same time, compared with the motor end cover in the prior art without the heat dissipation chamber 17 and the fan blade 15, the heat dissipation comparison diagram of the two at the position of the motor front end cover bearing 11 is shown in FIG. Fig. 9 As shown, after simulating the front end cover of the present application and the front end cover of the motor in the prior art running for 190 minutes under the same power motor, it was found that the heat dissipation efficiency of the front end cover bearing 11 position of the present application can be improved by more than 31% compared with the front end cover of the motor in the prior art. For example, the temperature of the end cover motor shaft 12 bearing 11 of a 90kW prior art was 90°C after 190 minutes of simulation operation, while the temperature of the end cover bearing 11 position of the present application was 61°C. And as the motor power continues to increase, the heat dissipation advantage of the front end cover bearing 11 position of the present application becomes more and more obvious.

[0079] Compared with the motor end cover in the prior art, the effective heat exchange area of ​​the outer end surface of the motor end cover in the present application that is in contact with the air is increased by more than 31%. The heat dissipation area on the outer side of the bearing 11 is further increased by the heat dissipation ribs 16. At the same time, the air is guided into the circulating air duct, thereby improving the heat dissipation efficiency of the outer ring of the bearing 11, solving the problem of high temperature of the end cover bearing 11, and ensuring the reliability of the bearing 11.

[0080] Example 3

[0081] like Figure 1-Figure 8 As shown, a motor shaft system structure includes the motor end cover described in Example 2, in the axial direction of the motor shaft 12, a protective cover 14 is provided on the side of the fan blade 15 away from the heat dissipation chamber 17, the fan blade 15 is located inside the protective cover 14, and the protective cover 14 and the end cover shell 13 are connected at opposite ends.

[0082] Among them, the motor end cover includes a mounting portion 18 and an end cover shell 13, the mounting portion 18 is connected to the motor shaft 12 through a bearing 11; a fan blade 15 is also nested on the outside of the motor shaft 12; the end cover shell 13 is located on the outside of the mounting portion 18, and a heat dissipation chamber 17 is formed between the mounting portion 18 and the end cover shell 13, and the heat dissipation chamber 17 is located on one side of the fan blade 15; the outer wall of the mounting portion 18 is provided with a guide heat dissipation rib 16 located in the heat dissipation chamber 17.

[0083] In the present application, the protective cover 14 is fixedly connected to the motor end cover. The protective cover 14 can isolate the splashing water and particles around the motor, so that the motor end cover and the motor formed by the motor in the present application have a waterproof function, thereby improving the protection level of the motor end. At the same time, the protective cover 14 can also ensure that when the fan blades 15 rotate, foreign objects are prevented from entering the end cover and interfering with the operation, thereby further improving the stability of the motor operation.

[0084] Further, such as Figure 4 and Figure 8 As shown, a first mounting hole 19 is provided in the end surface of the protective cover 14 close to the end cover shell 13, and a second mounting hole 20 adapted to the first mounting hole 19 is provided in the end surface of the end cover shell 13 close to the protective cover 14; a plurality of first mounting holes 19 are evenly distributed along the edge of the end surface of the protective cover 14.

[0085] like Figure 4 As shown, the first mounting hole 19 and the second mounting hole 20 in the present application can be installed by fasteners such as screws during assembly. The protective cover 14 and the end cover shell 13 are fixed together, which can give full play to the protective effect of the protective cover 14 on the inside of the end cover shell 13 and the fan blades 15 outside the end cover shell 13. At the same time, the protective cover 14 in the present application is an annular structure, and the first mounting holes 19 are evenly distributed on the edge of the protective cover 14. The present application can limit the angle range between two adjacent first mounting holes 19 to D3. Since the first mounting hole 19 and the second mounting hole 20 are in a corresponding relationship, that is, the angle range between the second mounting holes 20 in the motor end cover is also D3, and D3=2×D2, which can ensure that the first mounting holes 19 are evenly stressed in the end cover, thereby improving the protective strength of the protective cover 14.

[0086] like Figure 6 As shown, Figure 6 Wherein L1 represents the sum of the dimensions of the motor end cover and the protective cover 14 in the direction of the axis of the motor shaft 12; L2 represents the dimension of the protective cover 14 in the direction of the axis of the motor shaft 12; L3 represents the minimum distance between the fan blade 15 and the end cover shell 13 in the direction of the axis of the motor shaft 12; L4 represents the dimension of the fan blade 15 in the plane perpendicular to the axis of the motor shaft 12; L4 represents the minimum dimension of the protective cover 14 in the plane perpendicular to the axis of the motor shaft 12.

[0087] The present application defines L2≥2×L3. Under this distance, a safe operating distance can be maintained between the end cover shell 13 and the fan blades 15 and the protective cover 14. During the rotation of the motor shaft 12, each component can operate stably without interference.

[0088] The present application specifies 3mm<L3≤10mm, which can ensure that the wind generated by the fan blades 15 can completely run into the heat dissipation chamber 17 for circulation, thereby reducing wind loss.

[0089] The present application defines L5-L4>8mm, which can ensure that there is enough space and air intake for the fan blades 15 to rotate.

[0090] In this embodiment, the motor end cover is installed at the front end of the motor and used as a front end cover to form the motor shaft 12 of the present application. At the same time, compared with the motor shaft 12 in the prior art that does not have a heat dissipation chamber 17 and a fan blade 15, the heat dissipation comparison diagram of the motor shaft 12 of the present application and the motor shaft 12 of the prior art at the position of the bearing 11 is shown as follows: Fig.10 As shown, after simulating the motor shaft 12 of the present application and the motor shaft 12 in the prior art running under the same power motor for 190 minutes, it was found that the heat dissipation efficiency of the front end cover bearing 11 position of the present application can be improved by more than 50% compared with the front end cover of the motor in the prior art. For example, the temperature of the end cover motor shaft 12 bearing 11 of a 90kW prior art was 96°C after 190 minutes of simulation operation, while the temperature of the end cover bearing 11 position of the present application was 45°C. And as the motor power continues to increase, the heat dissipation advantage of the bearing 11 position of the motor shaft 12 of the present application becomes more and more obvious.

[0091] The present application provides a motor shaft system structure including the above-mentioned motor end cover. Compared with the motor shaft structure in the prior art which does not have a heat dissipation chamber and a guide heat dissipation rib, when the motor shaft 12 rotates, the motor shaft 12 drives the fan blades 15 to rotate. When the fan blades 15 rotate, they stir the air. At the same time, the guide heat dissipation ribs 16 integrate the wind force of the flowing air, so that the flowing air is injected into the heat dissipation chamber 17 in an orderly manner, thereby achieving effective cooling and heat dissipation of the bearing 11. Through the above-mentioned structure, the temperature at the motor end cover position can be reduced by 50%, thereby effectively improving the running stability of the motor.

[0092] The present application also provides a motor including the above-mentioned motor shaft system structure, which can achieve effective cooling and heat dissipation at the motor end cover, thereby improving the motor operation stability and motor life.

[0093] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings. In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0094] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0095] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor end cover, characterized in that: It comprises a mounting portion (18) and an end cover housing (13); the mounting portion (18) is connected to a motor shaft (12) via a bearing (11); a fan blade (15) is also embedded on the outside of the motor shaft (12); The end cover shell (13) is located outside the mounting portion (18), a heat dissipation chamber (17) is formed between the mounting portion (18) and the end cover shell (13), and the heat dissipation chamber (17) is located on one side of the fan blade (15); the outer side wall of the mounting portion (18) is provided with a flow-guiding heat dissipation rib (16) located in the heat dissipation chamber (17).

2. A motor end cover according to claim 1, characterized in that: The guiding and heat dissipating ribs (16) comprise a fixed end and a suspended end. There are a plurality of guiding and heat dissipating ribs (16), the fixed ends of the plurality of guiding and heat dissipating ribs (16) are all fixed on the outer wall of the mounting portion (18), and the suspended ends of the plurality of guiding and heat dissipating ribs (16) extend in a clockwise or counterclockwise direction.

3. A motor end cover according to claim 1, characterized in that: The mounting portion (18) is an annular structure, and the angle between the fixed ends of two adjacent flow-guiding and heat-dissipating ribs (16) is in the range of 45°-60°.

4. A motor end cover according to claim 1, characterized in that: The guiding and heat dissipating rib (16) is an arc-shaped structure, and the angle between the fixed end and the suspended end of the guiding and heat dissipating rib (16) is in the range of 35°-45°.

5. The motor end cover according to claim 1, characterized in that: The thickness of the guiding and heat dissipating rib (16) is less than or equal to 3 mm, and the thickness refers to the dimension of a plane perpendicular to the extending direction of the guiding and heat dissipating rib (16).

6. The motor end cover according to claim 1, characterized in that: An arc transition portion is provided between the end of the heat dissipation chamber (17) away from the fan blade (15) and the side wall of the heat dissipation chamber (17).

7. The motor end cover according to claim 1, characterized in that: In the direction of the axis of the motor shaft (12), the minimum distance between the fan blade (15) and the end cover housing (13) is L3; the size of the fan blade (15) in the direction of the axis of the motor shaft (12) is L2, and L2≥2×L3.

8. A motor shaft system structure, characterized in that: A motor end cover comprising the motor end cover according to any one of claims 1 to 7, wherein a protective cover (14) is provided on the side of the fan blade (15) away from the heat dissipation chamber (17) in the axial direction of the motor shaft (12), the fan blade (15) is located inside the protective cover (14), and the protective cover (14) and the end cover shell (13) are connected at opposite ends.

9. The motor shaft system structure according to claim 8, characterized in that: A first mounting hole (19) is provided in the end surface of the protective cover (14) close to the end cover shell (13), and a second mounting hole (20) matching the first mounting hole (19) is provided in the end surface of the end cover shell (13) close to the protective cover (14); a plurality of first mounting holes (19) are evenly distributed along the edge of the end surface of the protective cover (14).

10. A motor, characterized in that: Including a motor shaft system structure as described in claim 8.

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