Three-phase asynchronous motor

Abstract

The utility model provides a three-phase asynchronous motor, and belongs to the field of motors. The motor rear end cover solves the problem that the connection part of the existing motor rear end cover is poor in sealing performance. The three-phase asynchronous motor comprises a machine barrel and a rear end cover connected to the rear end portion of the machine barrel, the rear end portion of the machine barrel sequentially extends outwards in the axial direction to form a first plummer block and a second plummer block, the first plummer block is connected with the inner wall of the rear end cover in a matched mode through internal and external threads, and a sealing device used for improving connection sealing strength is embedded in the inner side wall of the rear end cover. A plurality of sealing flanges facilitating extrusion sealing are arranged on the inner side wall of the sealing device, the outer portion of the second plummer block is of an inclined structure, the cross section of the second plummer block is of a circular truncated cone structure, the corresponding end of the machine barrel extends outwards in the axial direction to form connecting parts facilitating looseness prevention, and the connecting parts are connected through a plurality of fastening screws. The inner side wall of the rear end cover is provided with a mounting groove for embedding and mounting the sealing device. The sealing structure has the advantage of high sealing performance.

Description

Technical Field

[0001] The utility model belongs to the field of motors and relates to a motor, in particular to a three-phase asynchronous motor. Background Art

[0002] The three-phase asynchronous motor is a type of induction motor. Since the rotor and stator rotating magnetic fields of the three-phase asynchronous motor rotate in the same direction but at different speeds, there is a slip rate. After the current is passed through the stator, part of the magnetic flux passes through the short-circuit ring and generates an induced current in it. The sealing effect is generally achieved through a sealing ring.

[0003] At present, during the operation of most three-phase asynchronous motors, the rear cover of the motor is usually connected by locking multiple screws in a circle. The connection method is simple, and the motor vibrates during operation, thereby reducing the tightness of the connection between the protective front cover and the protective rear cover, causing external water impurities to enter the interior of the motor, causing damage to the internal components of the motor and shortening the service life of the motor. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-sealing three-phase asynchronous motor to solve the above problems in the prior art.

[0005] The purpose of the utility model can be achieved by the following technical solutions: A three-phase asynchronous motor includes a barrel and a rear end cover connected to the rear end of the barrel, characterized in that the rear end of the barrel has a first pillow block and a second pillow block extending axially outward in sequence, and the pillow block is connected to the inner wall of the rear end cover by internal and external threads;

[0006] A sealing device for improving the connection sealing strength is embedded on the inner side wall of the rear end cover, and the inner side wall of the sealing device has a plurality of sealing flanges for facilitating extrusion sealing;

[0007] The exterior of the second pillow block is arranged in an inclined structure, and the cross section of the second pillow block is arranged in a truncated cone structure;

[0008] The barrel has a connecting portion extending axially outward from the corresponding end portion thereof to prevent loosening, and the connecting portion is connected by a plurality of fastening screws;

[0009] An installation groove for embedding and installing the sealing device is provided on the inner side wall of the rear end cover.

[0010] In the above-mentioned three-phase asynchronous motor, the mounting groove cooperates with the outside of the second pillow block to form a sealed cavity for the sealing device to be squeezed and filled. The sealing device is continuously tightened through the threaded cooperation between the first pillow block and the inner wall of the rear end cover, so that the sealing flange located on the inner side of the sealing device is continuously squeezed and fitted into the inside of the sealed cavity.

[0011] In the above-mentioned three-phase asynchronous motor, the sealing flange has a semicircular cross-section and is sequentially arranged inside the sealing device, and is integrally formed with the sealing device.

[0012] In the above-mentioned three-phase asynchronous motor, the number of the fastening screws is 4, and the 4 fastening screws are distributed in sequence in a circumferential direction along the outside of the connecting part. The fastening screws pass through the connecting part and the barrel in sequence and are used for radial connection limitation of the rear end cover.

[0013] Compared with the existing technology, the three-phase asynchronous motor has a simple structural design. It uses continuous extrusion of the sealing device and the sealing flange to achieve high sealing performance at the connection between the rear end cover and the barrel. At the same time, through the cooperation of the internal and external threads of the pillow block and the inner side of the rear end cover, as well as the radial fixation of the fastening screws, the tightness of the connection between the barrel and the rear end cover is effectively improved, thereby increasing the stability of the overall operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional structural diagram of the three-phase asynchronous motor.

[0015] Figure 2 It is a schematic diagram of the three-dimensional structure of the sealing device of the three-phase asynchronous motor.

[0016] Figure 3 This is a partial cross-sectional structural diagram of the three-phase asynchronous motor.

[0017] In the figure, 1, barrel; 2, rear end cover; 3, pillow block 1; 4, pillow block 2; 5, sealing device; 6, sealing flange; 7, connecting part; 8, mounting groove; 9, fastening screw. DETAILED DESCRIPTION

[0018] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0019] like Figure 1 、 Figure 2 、 Figure 3As shown, the three-phase asynchronous motor includes a barrel 1 and a rear end cover 2 connected to the rear end of the barrel 1. The rear end of the barrel 1 is axially extended outward with a pillow block 1 3 and a pillow block 2 4. The pillow block 1 3 is connected to the inner wall of the rear end cover 2 by internal and external threads. A sealing device 5 for improving the connection sealing strength is embedded on the inner side wall of the rear end cover 2. The inner side wall of the sealing device 5 has a plurality of sealing flanges 6 for facilitating extrusion sealing. The outer side of the pillow block 2 4 is arranged in an inclined structure, and the cross section of the pillow block 2 4 is arranged in a truncated cone structure. The corresponding end of the barrel 1 is axially extended outward. A connecting portion 7 is extended to prevent loosening, and the connecting portion 7 is connected by a number of fastening screws 9. A mounting groove 8 for the sealing device 5 to be embedded and installed is provided on the inner wall of the rear end cover 2. The above structure is simple in design, and the high sealing performance of the connection between the rear end cover 2 and the barrel 1 is achieved by continuously squeezing the sealing device 5 and the sealing flange 6. At the same time, through the cooperation of the internal and external threads of the pillow block 3 and the inner side of the rear end cover 2, and the radial fixation of the fastening screws 9, the tightness of the connection between the barrel 1 and the rear end cover 2 is effectively improved, and the stability of the overall operation of the motor is increased.

[0020] To elaborate further, in order to improve the connection sealing strength between the barrel 1 and the rear end cover 2, the mounting groove 8 cooperates with the outside of the pillow block 2 4 to form a sealing cavity for the sealing device 5 to be squeezed and filled. The sealing device 5 is continuously tightened through the threaded cooperation between the pillow block 1 3 and the inner wall of the rear end cover 2, so that the sealing flange 6 located on the inner side of the sealing device 5 is continuously squeezed and fitted into the inside of the sealing cavity. By extruding and deforming the sealing device 5 and the sealing flange 6, they are fully filled on the peripheral wall of the sealing cavity, thereby forming a high sealing structure.

[0021] To elaborate further, in order to facilitate extrusion sealing and improve the sealing elasticity of the sealing device 5 and the sealing flange 6, the sealing flange 6 has a semicircular cross-section and is sequentially arranged on the inner side of the sealing device 5 and is an integrally formed structure with the sealing device 5.

[0022] To elaborate further, in order to prevent the connection from loosening due to the vibration caused by the operation of the motor, there are four fastening screws 9, which are distributed in a circumferential direction along the outside of the connecting part 7. The fastening screws 9 pass through the connecting part 7 and the barrel 1 in sequence, and are used for radial connection limitation of the rear end cover 2.

[0023] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0024] Although this document frequently uses terms such as barrel 1, rear end cover 2, pillow block 1 3, pillow block 2 4, sealing device 5, sealing flange 6, connecting portion 7, mounting groove 8, and fastening screw 9, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A three-phase asynchronous motor comprising a barrel (1) and a rear end cover (2) connected to the rear end of the barrel (1), characterized in that: The rear end of the barrel (1) is provided with a pillow block 1 (3) and a pillow block 2 (4) extending axially outward in sequence, and the pillow block 1 (3) is connected to the inner wall of the rear end cover (2) through internal and external threads; A sealing device (5) for improving the connection sealing strength is embedded on the inner side wall of the rear end cover (2), and the inner side wall of the sealing device (5) has a plurality of sealing flanges (6) for facilitating extrusion sealing; The exterior of the second pillow block (4) is arranged in an inclined structure, and the cross section of the second pillow block (4) is arranged in a truncated cone structure; The barrel (1) has a connecting portion (7) extending axially outward from the corresponding end portion thereof to prevent loosening, and the connecting portion (7) is connected via a plurality of fastening screws (9); The inner side wall of the rear end cover (2) is provided with an installation groove (8) for the sealing device (5) to be embedded and installed.

2. A three-phase asynchronous motor according to claim 1, characterized in that: The mounting groove (8) cooperates with the exterior of the second pillow block (4) to form a sealing cavity for the sealing device (5) to be squeezed and filled. The sealing device (5) is continuously tightened through the threaded cooperation of the first pillow block (3) and the inner wall of the rear end cover (2), so that the sealing flange (6) located on the inner side of the sealing device (5) is continuously squeezed and fitted into the interior of the sealing cavity.

3. A three-phase asynchronous motor according to claim 1, characterized in that: The sealing flange (6) has a semicircular cross-section and is sequentially arranged inside the sealing device (5), and is integrally formed with the sealing device (5).

4. A three-phase asynchronous motor according to claim 1, characterized in that: The number of the plurality of fastening screws (9) is four, and the four fastening screws (9) are sequentially spaced and distributed along the outer portion of the connecting portion (7) in a circumferential direction. The fastening screws (9) sequentially penetrate the connecting portion (7) and the barrel (1) and are used for radial connection limiting of the rear end cover (2).

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