End cover sealing structure of brushless direct current motor

Abstract

The utility model discloses an end cover sealing structure of a brushless direct current motor, which relates to the technical field of brushless direct current motors and comprises a brushless direct current motor, a mounting plate is sleeved on the front side of the surface of the brushless direct current motor, the mounting plate is rotatably connected with an output shaft of the brushless direct current motor, a groove is arranged on the front side of the mounting plate, and the end cover sealing structure of the brushless direct current motor is arranged in the groove. An inner cavity of the groove is fixedly connected with a shaft sleeve. The brushless direct current motor end sealing structure has the advantages of being good in sealing performance, achieving sealing of the end portion of a brushless direct current motor under the cooperation of the structure in the actual using process, effectively preventing external impurities such as dust, moisture or other harmful substances from invading, guaranteeing stable operation of the brushless direct current motor, and improving the service life of the brushless direct current motor. The brushless direct current motor is simple in structure, convenient to use, capable of effectively prolonging the service life of the motor, capable of avoiding short circuit possibly caused by impurity invasion and remarkably improving the durability and reliability of the brushless direct current motor, and therefore the brushless direct current motor has good market prospects and is worthy of popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless DC motors, and specifically relates to an end cover sealing structure of a brushless DC motor. Background Technique

[0002] A brushless DC motor is a typical mechatronic product, which consists of a motor main body and a driver. This kind of motor has no carbon brush and commutator (or slip ring), so it is also called a commutatorless motor. The working principle of a brushless DC motor is based on the principle of a synchronous motor. Its rotor is composed of magnets, and rotation is achieved by controlling the current on the stator. Since the magnets on the rotor are controlled by electronic components, this kind of motor has the advantages of high efficiency, high reliability and low noise.

[0003] For example, a brushless DC motor disclosed in the patent with the publication number CN209472470U has the following beneficial effects: A brushless DC motor is provided. By using the first housing and the second housing, the first housing and the second housing are first sleeved on the outer side wall of the motor main body. When the second housing is sleeved, the groove block can slide by the support rod. When the compression spring expands and contracts, it can slide inside the first slider. The groove block is pushed by the compression spring to make the groove block fit with the output shaft of the motor main body, making the fit of the groove block tighter. When the output shaft rotates, the balls will rotate together, reducing wear, and at the same time, it can provide support to avoid the disadvantages of large friction and large loss during rotation; however, the above patent lacks a structure for sealing the output end of the brushless DC motor. At this time, it may cause the brushless DC motor to be easily invaded by dust, moisture or other impurities in the external environment during operation, thereby affecting the performance of the motor and even possibly shortening the service life of the motor.

[0004] In view of the above problems, the utility model provides an end cover sealing structure of a brushless DC motor. Content of the Utility Model

[0005] The purpose of the utility model is to provide an end cover sealing structure of a brushless DC motor, which realizes the sealing of the end of the brushless DC motor through the combined use of structures. It not only effectively blocks the intrusion of external impurities, such as dust, moisture or other harmful substances, ensures the stable operation of the brushless DC motor, but also effectively extends the service life of the motor. Moreover, it also avoids the situation of short circuit that may be caused by the intrusion of impurities, significantly improving the durability and reliability of the brushless DC motor, thus solving the problems in the background technique.

[0006] To achieve the above object, the present utility model provides the following technical solution: An end - cover sealing structure of a brushless DC motor, including a brushless DC motor. An installation plate is sleeved on the front side of the surface of the brushless DC motor. A rotational connection is formed between the installation plate and the output shaft of the brushless DC motor. A groove is opened on the front side of the installation plate. A shaft sleeve is fixedly connected to the inner cavity of the groove. The front side of the shaft sleeve extends to the outside of the groove and is fixedly connected to a first shaft - head sealing cover. A second shaft - head sealing cover is arranged on the front side of the first shaft - head sealing cover. A first sealing groove and a second sealing groove are respectively opened on the opposite sides of the first shaft - head sealing cover and the second shaft - head sealing cover. A first sealing ring and a second sealing ring are respectively embedded in the inner cavities of the first sealing groove and the second sealing groove. One side of the first sealing ring is in contact with the second sealing ring. Two symmetrically arranged wedge - shaped blocks and concave blocks are fixedly connected to the surfaces of the first shaft - head sealing cover and the second shaft - head sealing cover. The concave block on the surface of the first shaft - head sealing cover is adapted to the wedge - shaped block on the surface of the second shaft - head sealing cover, and the concave block on the surface of the second shaft - head sealing cover is adapted to the wedge - shaped block on the surface of the first shaft - head sealing cover. A clamping rod penetrates through the top of the concave block, and the bottom end of the clamping rod extends to the outside of the concave block. A clamping groove engaged with the clamping rod is opened on the top of the wedge - shaped block. A linkage plate is sleeved on the surface of the clamping rod and located in the inner cavity of the concave block. A spring is sleeved on the surface of the clamping rod and located in the inner cavity of the concave block. Two ends of the spring are respectively fixedly connected to the linkage plate and the concave block. A positioning groove is opened on the front side of the second shaft - head sealing cover. A dust - proof ring is arranged in the inner cavity of the positioning groove. A pressing plate is arranged on the front side of the dust - proof ring.

[0007] Further, threaded holes are opened at the four corners on one side of the installation plate, and the four threaded holes are symmetrically arranged.

[0008] Further, the top end of the clamping rod penetrates through the top of the concave block and is fixedly connected to an operation block, and anti - slip lines are arranged on the surface of the operation block.

[0009] Further, one side of the wedge - shaped block is provided with an inclined surface, and the inclined surface is used in cooperation with the clamping rod.

[0010] Further, a gasket is fixedly connected to the back surface of the second shaft - head sealing cover. A placement groove is opened on the front surface of the first shaft - head sealing cover. A sealing ring is arranged in the inner cavity of the placement groove. One side of the gasket extends into the inner cavity of the placement groove and is in contact with the sealing ring.

[0011] Further, four bolts penetrate through one side of the pressing plate, and the pressing plate is detachably connected to the second shaft - head sealing cover through the bolts.

[0012] Further, the shaft sleeve, the first shaft - head sealing cover, the first sealing ring, the second sealing ring, and the second shaft - head sealing cover are all located outside the output shaft of the brushless DC motor and are rotationally connected to the output shaft of the brushless DC motor.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The end - cover sealing structure of a brushless DC motor provided by the present utility model has the advantage of good sealing performance. During the actual use process, with the cooperation of the structure, it realizes the sealing of the end of the brushless DC motor. It not only effectively blocks the intrusion of external impurities such as dust, moisture or other harmful substances, ensures the stable operation of the brushless DC motor, but also effectively extends the service life of the motor. Moreover, it also avoids the situation of short - circuit that may be caused by the intrusion of impurities, significantly improves the durability and reliability of the brushless DC motor. Therefore, it has a good market prospect and is worthy of promotion. Brief Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a three - dimensional schematic diagram of the split state of the brushless DC motor, mounting plate and bushing of the present utility model;

[0017] Figure 3 is a three - dimensional schematic diagram of the split state of the partial structure of the present utility model;

[0018] Figure 4 is a three - dimensional schematic diagram of the split state of the rear - view structure of the first sealing ring, second sealing ring, gasket and sealing ring of the present utility model;

[0019] Figure 5 is a three - dimensional schematic diagram of the split state of the concave block of the present utility model.

[0020] In the figure: 1. Brushless DC motor; 2. Mounting plate; 3. Groove; 4. Bushing; 5. First shaft - end sealing cover; 6. Second shaft - end sealing cover; 7. First sealing groove; 8. Second sealing groove; 9. Second sealing ring; 10. Second sealing ring; 11. Wedge - shaped block; 12. Concave block; 13. Clamping rod; 14. Card slot; 15. Linking plate; 16. Spring; 17. Positioning groove; 18. Dust - proof ring; 19. Pressing plate; 20. Threaded hole; 21. Operating block; 22. Inclined plane; 23. Gasket; 24. Sealing ring; 25. Placing groove; 26. Bolt. Detailed Description of the Embodiment

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0022] To solve technical problems, such asFigures 1-5 As shown in the figure, the following preferred technical solutions are provided:

[0023] An end cover sealing structure of a brushless DC motor, including a brushless DC motor 1. An installation plate 2 is sleeved on the front side of the surface of the brushless DC motor 1. A rotational connection is formed between the installation plate 2 and the output shaft of the brushless DC motor 1. A groove 3 is opened on the front side of the installation plate 2. A shaft sleeve 4 is fixedly connected to the inner cavity of the groove 3. The front side of the shaft sleeve 4 extends to the outside of the groove 3 and is fixedly connected to a first shaft head sealing cover 5. A second shaft head sealing cover 6 is arranged on the front side of the first shaft head sealing cover 5. A first sealing groove 7 and a second sealing groove 8 are respectively opened on the opposite sides of the first shaft head sealing cover 5 and the second shaft head sealing cover 6. A first sealing ring 9 and a second sealing ring 10 are respectively embedded in the inner cavities of the first sealing groove 7 and the second sealing groove 8. One side of the first sealing ring 9 is in contact with the second sealing ring 10. Two symmetrically arranged wedge-shaped blocks 11 and concave blocks 12 are fixedly connected to the surfaces of the first shaft head sealing cover 5 and the second shaft head sealing cover 6. The concave block 12 on the surface of the first shaft head sealing cover 5 is adapted to the wedge-shaped block 11 on the surface of the second shaft head sealing cover 6. The concave block 12 on the surface of the second shaft head sealing cover 6 is adapted to the wedge-shaped block 11 on the surface of the first shaft head sealing cover 5. A clamping rod 13 penetrates through the top of the concave block 12, and the bottom end of the clamping rod 13 extends to the outside of the concave block 12. A clamping groove 14 engaged with the clamping rod 13 is opened on the top of the wedge-shaped block 11. A linkage plate 15 is sleeved on the surface of the clamping rod 13 and located in the inner cavity of the concave block 12. A spring 16 is sleeved on the surface of the clamping rod 13 and located in the inner cavity of the concave block 12. Two ends of the spring 16 are respectively fixedly connected to the linkage plate 15 and the concave block 12. A positioning groove 17 is opened on the front side of the second shaft head sealing cover 6. A dust-proof ring 18 is arranged in the inner cavity of the positioning groove 17. A pressing plate 19 is arranged on the front side of the dust-proof ring 18.

[0024] Threaded holes 20 are opened at the four corners of one side of the installation plate 2, and the four threaded holes 20 are symmetrically arranged. Through the arrangement of the threaded holes 20, it is convenient for the user to install and position the installation plate 2 by using the threaded holes 20, thereby improving the stability of the brushless DC motor 1 during operation.

[0025] The top end of the clamping rod 13 penetrates through the top of the concave block 12 and is fixedly connected to an operation block 21. Anti-slip lines are arranged on the surface of the operation block 21. Through the arrangement of the operation block 21, the clamping rod 13 can be driven to move by using the operation block 21, thereby achieving the purpose of locking the contact between the concave block 12 and the wedge-shaped block 11.

[0026] One side of the wedge-shaped block 11 is provided with an inclined surface 22, and the inclined surface 22 is used in cooperation with the clamping rod 13. Through the arrangement of the inclined surface 22, when the second shaft head sealing cover 6 rotates, the clamping rod 13 can move along the inclined surface 22 to one side of the wedge-shaped block 11, thereby facilitating the clamping rod 13 to be inserted into the inner cavity of the clamping groove 14.

[0027] A gasket 23 is fixedly connected to the back surface of the second shaft head sealing cover 6. A placement groove 25 is formed on the front surface of the first shaft head sealing cover 5. A sealing ring 24 is arranged in the inner cavity of the placement groove 25. One side of the gasket 23 extends into the inner cavity of the placement groove 25 and contacts the sealing ring 24. Through the cooperation of the gasket 23, the sealing ring 24 and the placement groove 25, the second shaft head sealing cover 6 will drive the gasket 23 and the sealing ring 24 to be clamped into the inner cavity of the placement groove 25, further strengthening the sealing performance between the first shaft head sealing cover 5 and the second shaft head sealing cover 6 and providing auxiliary sealing for the entire device.

[0028] Four bolts 26 penetrate through one side of the pressing plate 19, and the pressing plate 19 is detachably connected to the second shaft head sealing cover 6 through the bolts 26. Through the arrangement of the bolts 26, the pressing plate 19 can be positioned on one side of the second shaft head sealing cover 6 by using the bolts 26, and the stability of the dust-proof ring 18 can be effectively improved.

[0029] The shaft sleeve 4, the first shaft head sealing cover 5, the first sealing ring 9, the second sealing ring 10, and the second shaft head sealing cover 6 are all located outside the output shaft of the brushless DC motor 1 and are rotationally connected to the output shaft of the brushless DC motor 1.

[0030] Working principle: During use, the mounting plate 2 is installed on the surface of the brushless DC motor 1. The first shaft head sealing cover 5 is used to drive the shaft sleeve 4 to be positioned in the inner cavity of the groove 3. Then the second shaft head sealing cover 6 approaches the first shaft head sealing cover 5, and the second shaft head sealing cover 6 is rotated so that the concave block 12 on the surface of the second shaft head sealing cover 6 is engaged with the wedge block 11 on the surface of the first shaft head sealing cover 5, and the concave block 12 on the surface of the first shaft head sealing cover 5 is engaged with the wedge block 11 on the surface of the second shaft head sealing cover 6. At the same time, during the engagement process of the concave block 12 and the wedge block 11, that is, during the rotation process of the second shaft head sealing cover 6, the clamping rod 13 moves along the inclined surface 22 to the top of the wedge block 11. At this time, the clamping rod 13 will drive the linkage plate 15 to move upward to compress the spring 16. When the clamping rod 13 moves to the clamping groove 14, the extrusion force of the wedge block 11 on the clamping rod 13 disappears. Under the elastic potential energy of the spring 16, the clamping rod 13 can be clamped into the inner cavity of the clamping groove 14, thereby strengthening the stability between the first shaft head sealing cover 5 and the second shaft head sealing cover 6. Through the arrangement of the first sealing ring 9 and the second sealing ring 10, while enhancing the sealing performance between the first shaft head sealing cover 5 and the second shaft head sealing cover 6, the sealing performance between the output shaft of the brushless DC motor 1 and the first shaft head sealing cover 5 and the second shaft head sealing cover 6 is also strengthened; further, a dust-proof ring 18 is arranged in the inner cavity of the positioning groove 17, and the dust-proof ring 18 is positioned by using the pressing plate 19, effectively preventing dust from entering the inner cavities of the first shaft head sealing cover 5 and the second shaft head sealing cover 6, thereby affecting the operation of the output shaft of the brushless DC motor 1.

[0031] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0032] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A brushless DC motor end cover sealing structure, comprising a brushless DC motor (1), characterized in that: A mounting plate (2) is sleeved on the front side of the surface of the brushless DC motor (1), and a rotation connection is formed between the mounting plate (2) and the output shaft of the brushless DC motor (1). A groove (3) is provided on the front side of the mounting plate (2), and a shaft sleeve (4) is fixedly connected to the inner cavity of the groove (3). The front side of the shaft sleeve (4) extends to the outside of the groove (3) and is fixedly connected to a shaft head sealing cover (5). A shaft head sealing cover (6) is provided on the front side of the shaft head sealing cover (5). A sealing groove 1 (7) and a sealing groove 2 (8) are respectively provided on the side opposite to the shaft head sealing cover 2 (6), and the inner cavities of the sealing groove 1 (7) and the sealing groove 2 (8) are respectively embedded with a sealing ring 1 (9) and a sealing ring 2 (10), and one side of the sealing ring 1 (9) is in contact with the sealing ring 2 (10), and the surfaces of the shaft head sealing cover 1 (5) and the shaft head sealing cover 2 (6) are fixedly connected with two symmetrically arranged wedge blocks (11) and concave blocks (12), which are located on the shaft head sealing cover 1. The concave block (12) on the surface of the shaft head sealing cover (5) is matched with the wedge block (11) on the surface of the shaft head sealing cover (6), and the concave block (12) on the surface of the shaft head sealing cover (6) is matched with the wedge block (11) on the surface of the shaft head sealing cover (5). A clamping rod (13) is provided through the top of the concave block (12), and the bottom end of the clamping rod (13) extends to the outside of the concave block (12). A clamping groove (14) is provided on the top of the wedge block (11) to be engaged with the clamping rod (13). A linkage plate (15) is sleeved on the surface of the clamping rod (13) and located in the inner cavity of the concave block (12); a spring (16) is sleeved on the surface of the clamping rod (13) and located in the inner cavity of the concave block (12); two ends of the spring (16) are respectively fixedly connected to the linkage plate (15) and the concave block (12); a positioning groove (17) is provided on the front side of the shaft head sealing cover (6); a dust ring (18) is provided in the inner cavity of the positioning groove (17); and a pressure plate (19) is provided on the front side of the dust ring (18).

2. The end cover sealing structure of a brushless DC motor according to claim 1, characterized in that: Threaded holes (20) are provided at four corners of one side of the mounting plate (2), and the four threaded holes (20) are symmetrically arranged.

3. The end cover sealing structure of a brushless DC motor according to claim 1, characterized in that: The top end of the clamping rod (13) penetrates through the top of the concave block (12) and is fixedly connected to an operating block (21), and the surface of the operating block (21) is provided with anti-slip grooves.

4. The end cover sealing structure of a brushless DC motor according to claim 1, characterized in that: A slope (22) is provided on one side of the wedge-shaped block (11), and the slope (22) cooperates with the clamping rod (13) for use.

5. The end cover sealing structure of a brushless DC motor according to claim 1, characterized in that: A gasket (23) is fixedly connected to the back surface of the second shaft head sealing cover (6), a placement groove (25) is provided on the front surface of the first shaft head sealing cover (5), a sealing ring (24) is provided in the inner cavity of the placement groove (25), and one side of the gasket (23) extends to the inner cavity of the placement groove (25) and contacts the sealing ring (24).

6. The end cover sealing structure of a brushless DC motor according to claim 1, characterized in that: Four bolts (26) are provided through one side of the pressure plate (19), and the pressure plate (19) is detachably connected to the second shaft head sealing cover (6) via the bolts (26).

7. The end cover sealing structure of a brushless DC motor according to claim 1, characterized in that: The shaft sleeve (4), shaft head sealing cover 1 (5), sealing ring 1 (9), sealing ring 2 (10), and shaft head sealing cover 2 (6) are all located outside the output shaft of the brushless DC motor (1) and are rotatably connected to the output shaft of the brushless DC motor (1).

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