Motor end cover and explosion-proof motor

Abstract

The utility model discloses a motor end cover and an explosion-proof motor. The motor end cover comprises: an end cover body (1); the multiple sets of connecting lug plates are arranged on the peripheral side of the end cover body (1) at intervals in the circumferential direction of the end cover body (1), each set of connecting lug plates comprises two lug plate single bodies (2), each lug plate single body (2) is provided with a connecting hole (3), a first included angle alpha is formed between the connecting lines of the centers of the connecting holes (3) of the two lug plate single bodies (2) in each set of connecting lug plates and the center of the end cover body (1), and a second included angle alpha is formed between the connecting lines of the centers of the connecting holes (3) of the two lug plate single bodies (2) in each set of connecting lug plates. Alpha is greater than 45 degrees. The motor end cover provided by the utility model can provide more installation modes and meet various installation requirements of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor end cover and an explosion-proof motor. Background Art

[0002] Explosion-proof motors are specifically designed to operate in flammable and explosive environments. Their design and manufacturing must meet certain explosion-proof requirements, and the structure and materials used must effectively prevent explosions caused by sparks, arcs, or high temperatures. Explosion-proof motors are commonly used in hazardous environments in industries such as oil, gas, and chemicals.

[0003] Motor relubrication refers to the need to relubricate the bearings, gears and other components of the motor regularly or as needed due to lubricant consumption, aging or contamination during the use of the motor to maintain its good working condition and extend its service life.

[0004] There are several main ways to relubricate motors: a. Manual lubrication: manually adding lubricant to the bearings, gears and other components of the motor on a regular basis; b. Automatic lubrication: the lubrication system automatically delivers lubricant to the bearings, gears and other components of the motor; c. Circulating lubrication: the lubricant is circulated to the bearings, gears and other components of the motor through the lubrication system to maintain their lubrication.

[0005] With the need for energy conservation and emission reduction, the energy efficiency requirements for motors are becoming increasingly higher. As a result, the radial dimensions of motors are increasing, and the diameters of their components are gradually increasing. For foot-mounted motors, the center-to-foot height dimension H cannot exceed the specified value in the standard. This value is fixed.

[0006] As the radial dimensions of a motor increase, the diameter of the end cap also increases. With conventional end caps, when the outer diameter of the end cap's connecting lugs increases, the height from the motor center to the base fails to meet standard requirements. Current measures include cutting off the portion of the end cap's connecting lugs that exceeds the center height and flattening the lugs.

[0007] For motors with relubrication capabilities, the oil inlet and outlet methods have specific requirements, and therefore the location of the oil inlet and outlet holes on the motor end caps. When the motor's installation method changes, the location of the oil inlet and outlet holes on the motor end caps may not meet the motor's relubrication requirements. Therefore, this end cap design method only provides a limited number of installation options for relubricating motors and cannot meet various motor installation requirements. Utility Model Content

[0008] In view of this, the present invention proposes a motor end cover and an explosion-proof motor, which can provide more installation methods and meet various installation requirements of the motor.

[0009] According to an embodiment of the present invention, a motor end cover is provided, comprising:

[0010] an end cover body;

[0011] Multiple groups of connecting ear plates are arranged at intervals along the circumference of the end cover body on the outer peripheral side of the end cover body, each group of connecting ear plates includes two ear plate monomers, each ear plate monomer is provided with a connecting hole, and a first angle α is formed between the center of the connecting hole of the two ear plate monomers in each group of connecting ear plates and the center of the end cover body, α>45°.

[0012] In a preferred embodiment, the two ear plate units in each group of connecting ear plates have a cut edge at their bottom on the side close to the angle bisector of the first angle, and the cutting surface of the cut edge is perpendicular to the angle bisector of the first angle.

[0013] In a preferred embodiment, α≥60°.

[0014] In a preferred embodiment, a central hole is provided at the center of the end cover body, and a plurality of reinforcing ribs are distributed on the inner side of the end cover body along the circumference of the central hole.

[0015] In a preferred embodiment, each ear plate unit is trapezoidal in shape, and the angle between two side surfaces of each ear plate unit along the circumferential direction is β, where β is ≥ 5°.

[0016] In a preferred embodiment, multiple groups of connecting ear plates are evenly distributed on the outer peripheral side of the end cover body, and the two ear plate monomers in the same group of connecting ear plates are respectively the first monomer and the second monomer, and the width of the first monomer along the circumferential direction is smaller than the width of the second monomer along the circumferential direction.

[0017] In a preferred embodiment, the first monomer is symmetrical about a line connecting the center of the connecting hole on the first monomer and the center of the end cover body, and the second monomer has a sunken step on a side close to the first monomer, and the sunken step is located on the inner side of the second monomer.

[0018] In a preferred embodiment, the sinking height of the sunken step is greater than or equal to 2 mm.

[0019] In a preferred embodiment, the motor end cover further includes a first flange located at the first end of the end cover body, the connecting ear plate is arranged at the second end of the end cover body, the first flange has a plurality of first mounting holes, and the first mounting holes and the connecting holes are arranged in a circumferential and / or radially staggered manner.

[0020] According to another aspect of the present invention, an explosion-proof motor is provided, comprising a motor base and a motor end cover, wherein the motor end cover is the above-mentioned motor end cover and is arranged on the motor base.

[0021] It can be seen from the above scheme that the motor end cover adopts a method that is different from the traditional method of uniformly distributing the connecting ear plates along the circumference of the end cover body. By grouping the connecting ear plates, the distribution angle between the two ear plate monomers in each group of connecting ear plates is adjusted, and the angle between the two ear plate monomers is increased, so that the height of the ear plate monomer on the installation side is increased, and the size of the ear plate monomer exceeding the outer periphery of the end cover body is reduced, so that the distance h from the center of the end cover body to the installation bottom is also reduced as the height of the ear plate monomer is increased. Through this optimized design, the distance between the center of the end cover body and the mounting surface can be reduced, so that the motor end cover meets the requirement of not exceeding the center height H. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art will have a better understanding of the above and other features and advantages of the present invention. In the accompanying drawings:

[0023] Figure 1 Schematic diagram of the size and structure of the motor end cover according to an embodiment of the present utility model;

[0024] Figure 2 Schematic diagram of the structure of the motor end cover according to an embodiment of the present utility model;

[0025] Figure 3 Schematic diagram of the inner structure of the motor end cover according to an embodiment of the present utility model;

[0026] Figure 4 Schematic diagram of the three-dimensional structure of the motor end cover according to an embodiment of the present utility model;

[0027] Figure 5 Schematic diagram of the structure of the second unit of the motor end cover according to an embodiment of the present utility model;

[0028] Figure 6 for Figure 1 Schematic diagram of the enlarged structure at A;

[0029] Figure 7 1 is a three-dimensional structural diagram of a motor end cover according to an embodiment of the present utility model;

[0030] Figure 8 A side structural diagram of a motor end cover according to an embodiment of the present utility model;

[0031] Figure 9 Schematic diagram of the assembly structure of the base and the motor end cover according to an embodiment of the utility model;

[0032] Figure 10 This is a schematic diagram of the re-lubrication oil circuit structure after the motor is assembled according to an embodiment of the present utility model;

[0033] Figure 11 This is a structural diagram of the assembly of a machine base and a motor end cover according to an embodiment of the present utility model;

[0034] Figure 12 This is a structural diagram of the assembly of a machine base and a motor end cover according to an embodiment of the present utility model;

[0035] Figure 13 is an assembly structure diagram of a machine base and a motor end cover according to an embodiment of the utility model; and

[0036] Figure 14 The figure is an assembly structure diagram of a machine base and a motor end cover according to an embodiment of the present utility model.

[0037] In the above drawings, the reference numerals used are as follows:

[0038] 1. End cover body; 2. Ear plate unit; 3. Connection hole; 4. Center hole; 5. First unit; 6. Second unit; 7. Reinforcement rib; 8. Sunken step; 9. Machine base; 10. First flange; 11. First mounting hole; 12. Trimming edge. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with reference to the following embodiments.

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0042] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0043] like Figures 1 to 14As shown, according to an embodiment of the present invention, the motor end cover includes: an end cover body 1; a plurality of groups of connecting ear plates, which are arranged at intervals on the outer peripheral side of the end cover body 1 along the circumference of the end cover body 1, each group of connecting ear plates includes two ear plate monomers 2, and each ear plate monomer 2 is provided with a connecting hole 3, and a first angle α is formed between the center of the connecting hole 3 of the two ear plate monomers 2 in each group of connecting ear plates and the line connecting the center of the end cover body 1, α>45°.

[0044] This motor end cover adopts a method that differs from the traditional method of evenly distributing connecting lugs along the circumference of the end cover body 1. By grouping the connecting lugs, the distribution angle between the two lug units 2 in each group of connecting lugs is adjusted, increasing the angle between the two lug units 2. This increases the height of the lug units 2 on the mounting side, reducing the distance of the lug units 2 beyond the outer circumference of the end cover body 1. As a result, the distance h from the center of the end cover body 1 to the mounting bottom is also reduced as the height of the lug units 2 is increased. This optimized design can reduce the distance from the center of the end cover body 1 to the mounting surface, ensuring that the motor end cover meets the requirement of not exceeding the center height H. Where H is the standard value for the height from the center to the foot.

[0045] The mounting bottom here refers to the side where the mounting platform F is located. When the mounting platform F is on the left, the mounting bottom of the end cap body is also on the left. When the mounting platform F is on the right, the mounting bottom of the end cap body is also on the right. When the mounting platform F is on the upper side, the mounting bottom of the end cap body is also on the upper side. When the mounting platform F is on the lower side, the mounting bottom of the end cap body is also on the lower side. Through the above method, the mounting bottom of the end cap body can be associated with the location of the mounting platform F, thereby accurately defining the location of the ear plate unit 2 of the end cap body that needs to cooperate with the mounting platform F.

[0046] Since each group of connecting ear plates is set according to the above requirements, and the connecting line of the center holes of the ear plate units in the same group is parallel to the installation plane of the motor, the above design can reduce the distance between the bottom of the ear plate unit and the center of the end cover body when the ear plate units in each group of connecting ear plates are on the installation side, so that no matter which installation angle the motor end cover is at, it can meet the matching requirements with the motor base. Therefore, the installation angle of the motor end cover relative to the base is not restricted, and the motor end cover can be installed on the base according to the design of the re-lubrication structure, which can provide more installation methods for the motor and meet the various installation requirements of the motor.

[0047] In one embodiment, the two ear plate units 2 in each group of connecting ear plates have a cut edge 12 at the bottom on the side close to the angle bisector of the first angle, and the cutting surface of the cut edge 12 is perpendicular to the angle bisector of the first angle.

[0048] In the embodiment, the bottom of each ear plate 2 close to the mounting surface is processed to form a cut edge 12, which avoids the bottom of the ear plate 2 protruding radially outward of the motor end cover, thereby reducing the distance between the bottom of the ear plate 2 and the center of the end cover body 1, so that the motor end cover meets the requirement of not exceeding the center height H. Since each ear plate 2 is processed with a cut edge at the bottom, the distance h between the bottom of the ear plate 2 and the center of the end cover body 1 can be further reduced, so that the end cover body 1 can meet the installation requirements of the motor and the installation requirements of the motor end cover for the re-lubrication of the motor at any rotating position.

[0049] Since the motor mounting surface is generally perpendicular to the angle bisector of the first included angle between the two ear plates 2 that have a cooperative relationship with the motor mounting surface, the cutting surface of the cut edge is perpendicular to the angle bisector of the first included angle, which can make the bottom cut edge of the two ear plates 2 parallel to the motor mounting surface, thereby maximizing the reduction of the maximum distance between the center of the end cover body and the ear plate 2, and avoiding the problem that the structure of the ear plate 2 increases the distance between the center of the end cover body and the mounting surface.

[0050] In one embodiment, α≥50°.

[0051] In one embodiment, α≥60°.

[0052] By limiting α to 50° or above, the distance between the two ear plates 2 in the same group can be more effectively guaranteed, which means that the end cover bottom bracket will be closer to the center of the motor, thereby significantly shortening the height dimension h from the center to the foot. This makes the motor more compact and saves space while meeting the requirements of explosion-proof standard and re-lubrication.

[0053] In one embodiment, the center of the end cover body 1 is provided with a center hole 4, and the inner side of the end cover body 1 is distributed with a plurality of reinforcing ribs 7 along the circumference of the center hole 4.

[0054] The arrangement of the reinforcing ribs 7 can significantly enhance the rigidity of the end cover body 1, preventing deformation or damage caused by vibration and external pressure during motor operation. The plurality of reinforcing ribs are distributed along the circumference of the center hole 4, which can evenly disperse the axial and radial forces generated during motor operation, ensuring that the end cover has good support in all directions. The design of the reinforcing ribs helps to improve the connection strength between the end cover and the bearing chamber, ensuring the stability and reliability of the bearing during motor operation.

[0055] The center hole 4 and the reinforcing ribs 7 on the end cover body 1 are arranged correspondingly and connected with the bearing chamber, which can better bear the stress generated during motor operation and meet the requirement of explosion pressure of the explosion-proof motor.

[0056] In one embodiment, each ear plate unit 2 is trapezoidal in shape, and the angle between two side surfaces of each ear plate unit 2 along the circumferential direction is β, where β is ≥ 5°.

[0057] By designing the lug unit 2 into a trapezoidal shape, the stress distribution of the lug under load is optimized, making it stronger and more resistant to vibration and stress during motor operation, thereby improving the overall reliability and service life of the motor. An appropriate β angle design increases the surface area of ​​the connection between the lug unit 2 and the base circle, improving the connection strength and thus better meeting the explosion pressure requirements of explosion-proof motors.

[0058] Compared with the structure of a rectangular ear plate monomer used in the related art, the ear plate monomer 2 with a trapezoidal structure having a β angle can have a larger connection surface with the end cover base circle and higher strength. The arc angle design is used at the corner end of the connecting ear plate, which not only saves materials but also has a more beautiful appearance.

[0059] In one embodiment, multiple groups of connecting ear plates are evenly distributed on the outer peripheral side of the end cover body 1, and the two ear plate monomers 2 in the same group of connecting ear plates are respectively the first monomer 5 and the second monomer 6, and the width of the first monomer 5 along the circumferential direction is smaller than the width of the second monomer 6 along the circumferential direction.

[0060] In this embodiment, the two ear plate units in the same set of connecting ear plates are of different sizes, wherein the width of the second unit 6 along the circumferential direction is greater than the width of the first unit 5 along the circumferential direction, so that the second unit 6 can be used not only for connection to the machine base 9, but also for installation and fixation of the wind hood. Since the second unit 6 has a larger structure than the first unit 5, it can provide sufficient fitting area and structural strength to meet the connection and fixation with the machine base 9 and the installation and fixation of the wind hood, realizing the multifunctionality of the ear plate unit structure design, saving the structure required for installing the wind hood, and making the overall installation structure more compact. The larger second unit 6 can provide sufficient space for installing the wind hood and other possible accessories, while the smaller first unit 5 provides connection to the machine base without increasing the additional space requirement, thereby achieving the goal of maximizing space utilization within a limited space.

[0061] In this embodiment, the large and small ear plate units are alternately arranged along the circumferential direction, and the second units 6 for installing the air hood are evenly distributed in the circumferential direction, which can facilitate the installation and fixation of the air hood.

[0062] By alternately using the first monomer 5 and the second monomer 6 , the installation requirements of the wind shield can be met and the use of materials can be reduced, thereby reducing the cost and the weight of the end cover.

[0063] In one embodiment, the first monomer 5 is symmetrical about the line connecting the center of the connecting hole 3 on the first monomer 5 and the center of the end cover body 1, and the second monomer 6 has a sunken step 8 on the side close to the first monomer 5, and the sunken step 8 is located on the inner side of the second monomer 6.

[0064] Through the symmetrical design, the connection hole 3 on the first monomer 5 can more evenly distribute the load and stress from the end cover body 1, thereby improving the stability and reliability of the overall structure. The symmetrical design of the first monomer 5 is also conducive to simplifying the mold design and manufacturing process and reducing production costs.

[0065] The sunken step 8 is located on the inner side of the second unit 6 and can serve as a part of the sealing surface, which helps to enhance the sealing effect, prevent external factors such as dust and moisture from invading the interior of the motor, and improve the protection level of the motor.

[0066] The sunken step 8 forms a prying groove between the motor end cover and the base 9 after assembly. This prying groove provides an additional fulcrum between the motor end cover and the base 9, making it easy to remove the end cover without damaging the original structure and sealing, thereby reducing the difficulty of removing the motor end cover. Due to the design of the sunken step 8, the mating surface between the motor end cover and the base 9 is not exposed, which protects the paint layer on the motor surface from scratches, maintains the clean appearance of the motor, and also reduces the possibility of rust, extending the service life of the motor.

[0067] In one embodiment, the sinking height L of the sinking step 8 is greater than or equal to 2 mm.

[0068] The design of the sinking height L of the sunken step 8 being greater than or equal to 2 mm not only improves the rust prevention, sealing and disassembly performance of the motor, but also increases the structural stability and installation flexibility, and has a significant positive effect on the reliable operation and maintenance of the explosion-proof motor.

[0069] In one embodiment, the motor end cover further includes a first flange 10 located at the first end of the end cover body 1, and the connecting ear plate is arranged at the second end of the end cover body 1. The first flange 10 has a plurality of first mounting holes 11, and the first mounting holes 11 and the connecting holes 3 are arranged in a circumferential and / or radially staggered manner.

[0070] In the related art, for motors that use end flanges for connection and installation, the connecting bolt holes of the end flange of the motor end cover and the connecting holes of the base of the motor end cover are on the same axis. This structure makes the customer installation bolts of the end flange and the connecting bolts of the base relative to each other, which has the disadvantage that the customer installation bolts are difficult to assemble during installation, making operation inconvenient.

[0071] In this embodiment, the connection holes 3 for realizing the installation of the motor end cover and the base and the first mounting holes 11 for realizing the installation of the motor are arranged in a staggered manner, which can leave space for the installation of the motor fixing bolts, facilitate the operation during the installation of the motor, and be suitable for application occasions where the end part of the motor is connected by using a flange.

[0072] The staggered arrangement of the mounting holes allows the motor to have greater flexibility during installation, can adapt to different installation positions and directions, and thus meets more extensive installation requirements.

[0073] The staggered arrangement of the mounting holes provides convenience for the maintenance work of the motor, especially when the motor is installed in a difficult-to-reach position. Maintenance personnel can more easily access the mounting holes to tighten or replace the bolts, ensuring the normal operation of the motor.

[0074] In one embodiment, the first mounting holes 11 and the connection holes 3 are arranged in a staggered manner along the circumference of the end cover body 1.

[0075] In one embodiment, the first mounting holes 11 and the connection holes 3 are arranged in a staggered manner along the radial direction of the end cover body 1.

[0076] In one embodiment, the first mounting holes 11 and the connection holes 3 are arranged in a staggered manner along both the circumference and the radial direction of the end cover body 1.

[0077] According to the embodiments of the utility model, the explosion-proof motor comprises a base 9 and a motor end cover, the motor end cover is the above-mentioned motor end cover, and the motor end cover is arranged on the base 9.

[0078] The above-mentioned motor end cover allows the motor to meet the explosion-proof standard while optimizing the radial dimension. By adjusting the distribution angle of the ear plate monomers 2 of the motor end cover and increasing the included angle between the adjacent two ear plate monomers 2 on the installation side, the distance from the center of the end cover to the installation bottom is shortened, so that a larger diameter bearing can be used without increasing the overall height of the motor, meeting the installation requirements of the motor.

[0079] For reference Figures 11 to 14 It is shown that the installation structure of the motor end cover changes when the motor is in different installation modes, and the arrow direction in the figure is the flow direction of the re-lubricating grease of the motor.

[0080] As shown in Figure 11 In this case, the installation platform F is located at the bottom, the motor base is in a normal installation state, the lubricating grease flows from top to bottom, and the re-lubrication of the motor is realized.

[0081] As shown in Figure 12As shown in the figure, in this case, the installation platform F is located on the left side, the motor base rotates with the installation platform F to the left, at this time, the motor end cover rotates an angle relative to the base, so that the lubricating grease still maintains the state of going in from the top and out from the bottom, realizing the re-lubrication of the motor. Since the spacing between each ear plate unit 2 of the motor end cover and the center of the motor is optimized, even if the rotating position of the motor end cover relative to the base is adjusted, the structural design of the ear plate unit 2 on the side where the installation platform F is located can still meet the installation requirements of the motor.

[0082] As shown in the figure, Figure 13 As shown in the figure, in this case, the installation platform F is located on the right side, the motor base rotates with the installation platform F to the right, at this time, the motor end cover rotates an angle relative to the base, so that the lubricating grease still maintains the state of going in from the top and out from the bottom, realizing the re-lubrication of the motor. Since the spacing between each ear plate unit 2 of the motor end cover and the center of the motor is optimized, even if the rotating position of the motor end cover relative to the base is adjusted, the structural design of the ear plate unit 2 on the side where the installation platform F is located can still meet the installation requirements of the motor.

[0083] As shown in the figure, Figure 14 As shown in the figure, in this case, the installation platform F is located on the right side, the motor base rotates with the installation platform F to the right, at this time, the motor end cover rotates an angle relative to the base, so that the lubricating grease still maintains the state of going in from the top and out from the bottom, realizing the re-lubrication of the motor. Since the spacing between each ear plate unit 2 of the motor end cover and the center of the motor is optimized, even if the rotating position of the motor end cover relative to the base is adjusted, the structural design of the ear plate unit 2 on the side where the installation platform F is located can still meet the installation requirements of the motor.

[0084] In the above various installation modes, Figures 12 to 14 As shown in the figure, the installation mode can be based on the installation mode shown in the figure, and the motor end cover, the bearing outer cover and the fan cover and other parts are rotated at the same time, realizing the demand of different installation modes of the motor. Figure 11

[0085] In the above various installation modes of the motor, by rotating the position of the motor end cover relative to the base, various installation modes of the motor can be realized, the demand of different installation modes of the motor is met, the re-lubrication effect of the motor is realized, the structure is simple and feasible, and the demand of the customer can be better met.

[0086] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.​

Claims

1. A motor end cover, characterized in that: include: an end cover body (1); A plurality of groups of connecting ear plates are arranged at intervals along the circumference of the end cover body (1) on the outer peripheral side of the end cover body (1), each group of connecting ear plates comprises two ear plate monomers (2), each of the ear plate monomers (2) is provided with a connecting hole (3), and a first angle α is formed between the center of the connecting holes (3) of the two ear plate monomers (2) in each group of connecting ear plates and the center of the end cover body (1), α>45°.

2. The motor end cover according to claim 1, characterized in that: The two ear plate units (2) in each group of the connecting ear plates each have a cut edge (12) at the bottom on the side close to the angle bisector of the first angle, and the cutting surface of the cut edge (12) is perpendicular to the angle bisector of the first angle.

3. The motor end cover according to claim 1, characterized in that: α≥60°。 4. The motor end cover according to claim 1, characterized in that: A central hole (4) is provided at the center of the end cover body (1), and a plurality of reinforcing ribs (7) are distributed on the inner side of the end cover body (1) along the circumference of the central hole (4).

5. The motor end cover according to claim 1, characterized in that: Each ear plate monomer (2) is trapezoidal, and the angle between the two side surfaces of each ear plate monomer (2) along the circumferential direction is β, and β is ≥ 5°.

6. The motor end cover according to claim 1, characterized in that: A plurality of groups of connecting ear plates are evenly distributed on the outer peripheral side of the end cover body (1); the two ear plate monomers (2) in the same group of connecting ear plates are respectively a first monomer (5) and a second monomer (6); the width of the first monomer (5) along the circumferential direction is smaller than the width of the second monomer (6) along the circumferential direction.

7. The motor end cover according to claim 6, characterized in that: The first monomer (5) is symmetrical about a line connecting the center of the connecting hole (3) on the first monomer (5) and the center of the end cover body (1), and the second monomer (6) has a sinking step (8) on a side close to the first monomer (5), and the sinking step (8) is located on the inner side of the second monomer (6).

8. The motor end cover according to claim 7, characterized in that: The sinking height of the sinking step (8) is greater than or equal to 2 mm.

9. The motor end cover according to claim 1, characterized in that: The motor end cover further comprises a first flange (10) located at a first end of the end cover body (1); the connecting lug is arranged at a second end of the end cover body (1); the first flange (10) has a plurality of first mounting holes (11); the first mounting holes (11) and the connecting holes (3) are arranged in a circumferential and / or radially staggered manner.

10. An explosion-proof motor, comprising a motor base (9) and a motor end cover, characterized in that: The motor end cover is the motor end cover according to any one of claims 1 to 9, and the motor end cover is arranged on the machine base (9).

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