Shielding case mounting structure in rotor assembly of shielding motor

Abstract

The utility model provides a shielding case installation structure in a shielding motor rotor assembly, and belongs to the technical field of motors. The problem that an existing assembly is not stable in structure is solved. The shielding case mounting structure in the rotor assembly of the shielding motor comprises a rotor shaft, and an upper end cover and a lower end cover which are respectively sleeved at two ends of the rotor shaft, two ends of a shielding case are respectively sleeved on the upper end cover and the lower end cover, and two ends of the shielding case are respectively and fixedly connected with the upper end cover and the lower end cover in a laser welding manner in a sealing manner; a first conical surface is formed on the inner wall of the upper end of the shielding case, the diameter of the first conical surface is gradually reduced from top to bottom, a second conical surface matched with the first conical surface is formed on the outer wall of the upper end cover, and the first conical surface and the second conical surface are attached together. The structure stability of the rotor assembly can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor technical field relates to a shielded motor rotor assembly, especially a shielded motor rotor assembly shield cover mounting structure. BACKGROUND

[0002] The shielded motor is a special type of motor, mainly used for conveying liquid with special properties.

[0003] The rotor assembly is an important part of the shielded motor, and its structure is disclosed in a shielded motor rotor processing method (application number: 200810033272.6) of Chinese patent library, including the following steps: after rough machining of the rotor, first, two screens are directly sleeved on the shaft, then argon arc welding is used to seal the connection between the shaft and the screen, and then the outer diameter of the rotor is machined, the rotor shield sleeve is installed on the rotor core, the leakage is detected, the rotor parts are placed in the oven and kept at 250 DEG C for 4-5 hours for drying, and after the rotor is taken out from the oven, the argon arc welding is used to seal the leakage hole, and after cooling, the shield sleeve is shrunk and tightly attached to the outer diameter of the rotor core to make no gap between them.

[0004] In the above processing method, the shield cover is first heated and sleeved into the rotor core, and the axial deviation exists in the sleeving process, and when the assembly is cooled and shrunk, the axial deviation will cause residual stress in the internal part of the component, which is easy to cause cracks at the stress concentration position, and even break, affecting the service life of the rotor assembly. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above problems existing in the prior art, and provides a shield cover mounting structure in a shielded motor rotor assembly with stable structure.

[0006] The utility model discloses a shield cover mounting structure in a shielded motor rotor assembly, which comprises a rotor shaft and upper and lower end covers sleeved on both ends of the rotor shaft respectively, and the two ends of the shield cover are sleeved on the upper and lower end covers respectively, characterized in that the two ends of the shield cover are fixedly connected with the upper and lower end covers respectively by laser welding, a first taper surface is formed on the inner wall of the upper end of the shield cover, and the diameter of the first taper surface gradually decreases from top to bottom, a second taper surface matched with the first taper surface is formed on the outer wall of the upper end cover, and the first and second taper surfaces are attached together.

[0007] The two ends of the shield cover are fixedly connected with the upper and lower end covers by laser welding, which can not only strengthen the positioning strength of the shield cover, but also strengthen the sealing performance between the end of the shield cover and the upper and lower end covers, strengthen the isolation effect of the shield cover, and improve the structural stability and service life of the rotor assembly.

[0008] Meanwhile, under the cooperation of the first taper surface and the second taper surface, the coaxiality of the shield cover and the rotor shaft can be improved, the residual stress generated due to the axis deviation when the shield cover shrinks after assembly can be reduced, and the structural stability and service life of the rotor assembly can be further improved.

[0009] In the shield cover mounting structure of the shield motor rotor assembly, an annular step is formed on the outer wall of the upper end cover, and the annular step is composed of an annular side surface and an annular bottom surface, the second taper surface is formed on the annular side surface, and the top surface of the shield cover is pressed against the annular bottom surface, so that the shield cover is once fitted in place, facilitating assembly.

[0010] In the shield cover mounting structure of the shield motor rotor assembly, the upper side of the first taper surface extends to the top surface of the shield cover, and the upper side of the second taper surface extends to the annular bottom surface, so that in actual design, the length of the first taper surface and the second taper surface can be extended to increase the contact area of the two, and the coaxiality can be further improved.

[0011] In the shield cover mounting structure of the shield motor rotor assembly, the outer diameter of the top surface of the shield cover is smaller than the outer diameter of the annular bottom surface, so that a mounting step is formed between the shield cover and the annular bottom surface, facilitating welding.

[0012] In the shield cover mounting structure of the shield motor rotor assembly, a tapered guide surface is formed on the outer side surface of the lower end of the lower end cover, the diameter of the guide surface gradually decreases from top to bottom, and the guide surface extends to the bottom surface of the lower end cover. The guide surface is provided to guide the shield cover to be smoothly fitted, further facilitating assembly.

[0013] Compared with the prior art, the shield cover mounting structure of the shield motor rotor assembly has the following advantages:

[0014] 1. The shield cover is laser welded and fixed with the upper end cover and the lower end cover at both ends, which can not only strengthen the positioning strength of the shield cover, but also strengthen the sealing performance between the end of the shield cover and the upper end cover and the lower end cover, strengthen the isolation effect of the shield cover, and improve the structural stability and service life of the rotor assembly.

[0015] 2. Under the cooperation of the first taper surface and the second taper surface, the coaxiality of the shield cover and the rotor shaft can be improved, the residual stress generated due to the axis deviation when the shield cover shrinks after assembly can be reduced, and the structural stability and service life of the rotor assembly can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of a shield motor rotor assembly.

[0017] Figure 2 is Figure 1 is an enlarged schematic view of A in

[0018] Figure 3is a structural schematic view of the upper end cover.

[0019] Figure 4 is Figure 1 is an enlarged schematic view at B in the middle.

[0020] In the figure, 1, rotor shaft; 2, upper end cover; 2a, second conical surface; 2b, annular step; 2b1, annular side surface; 2b2, annular bottom surface; 3, lower end cover; 3a, lead-in surface; 4, shield cover; 4a, first conical surface. DETAILED DESCRIPTION

[0021] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0022] As Figure 1 shown, the shield cover mounting structure in the shield motor rotor assembly includes a rotor shaft 1 and an upper end cover 2 and a lower end cover 3 respectively sleeved on both ends of the rotor shaft 1, and the upper end cover 2, the lower end cover 3, the shield cover 4 and the rotor shaft 1 are coaxially arranged.

[0023] Among them,

[0024] The upper end cover 2 and the lower end cover 3 are both welded and fixedly connected with the rotor shaft 1, and preferably the welding mode adopts laser welding.

[0025] As Figure 1 and Figure 2 shown, the two ends of the shield cover 4 are respectively sleeved on the upper end cover 2 and the lower end cover 3, and the two ends of the shield cover 4 are respectively sealed and fixedly connected with the upper end cover 2 and the lower end cover 3 by laser welding. The upper end inner wall of the shield cover 4 is formed with a first conical surface 4a, and the diameter of the first conical surface 4a gradually decreases from top to bottom. The outer wall of the upper end cover 2 is formed with a second conical surface 2a matched with the first conical surface 4a, and the first conical surface 4a and the second conical surface 2a are attached together.

[0026] The two ends of the shield cover 4 are respectively laser welded and fixed with the upper end cover 2 and the lower end cover 3, so that the positioning strength of the shield cover 4 can be strengthened, the sealing performance between the end of the shield cover 4 and the upper end cover 2 and the lower end cover 3 can be strengthened, the isolation effect of the shield cover 4 can be strengthened, and the structural stability and service life of the rotor assembly can be improved.

[0027] At the same time, under the cooperation of the first conical surface 4a and the second conical surface 2a, the coaxiality of the shield cover 4 and the rotor shaft 1 can be improved, the residual stress generated by axis deviation when cooling and shrinking after assembly can be reduced, and the structural stability and service life of the rotor assembly can be further improved.

[0028] Further explanation, as Figures 1 to 3As shown, the outer wall of the upper end cover 2 is formed with an annular step 2b, and the annular step 2b is coaxially arranged with the upper end cover 2. The axial section of the annular step 2b is substantially L-shaped, and the annular step 2b is composed of an annular side surface 2b1 and an annular bottom surface 2b2. Among them, the second conical surface 2a is formed on the annular side surface 2b1, and the top surface of the shielding cover 4 is pressed on the annular bottom surface 2b2, so that the shielding cover 4 is once sleeved in place, facilitating assembly. Further, the first conical surface 4a extends to the top surface of the shielding cover 4, and the second conical surface 2a extends to the annular bottom surface 2b2, so that in actual design, the length of the first conical surface 4a and the second conical surface 2a can be lengthened to increase the contact area, thereby further improving the coaxiality.

[0029] In the actual product, as shown in Figure 2 and Figure 4 , the outer diameter of the top surface of the shielding cover 4 is smaller than the outer diameter of the annular bottom surface 2b2, so that a mounting step is formed between the shielding cover 4 and the annular bottom surface 2b2, facilitating welding. The lower end of the lower end cover 3 is formed with a tapered lead-in surface 3a, the diameter of the lead-in surface 3a gradually decreases from top to bottom, and the lead-in surface 3a extends to the bottom surface of the lower end cover 3. The lead-in surface 3a is arranged to guide the shielding cover 4 to be more smoothly sleeved, further facilitating assembly.

[0030] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A shield mounting structure in a shielded motor rotor assembly, comprising a rotor shaft (1), an upper end cover (2) and a lower end cover (3) respectively sleeved on both ends of the rotor shaft (1), and a shield (4) respectively sleeved on the upper end cover (2) and the lower end cover (3), characterized in that, The shielding cover (4) is sealed and fixedly connected with the upper end cover (2) and the lower end cover (3) at both ends by laser welding; a first taper (4a) is formed on the inner wall of the upper end of the shielding cover (4), and the diameter of the first taper (4a) gradually decreases from top to bottom; a second taper (2a) matched with the first taper (4a) is formed on the outer wall of the upper end cover (2), and the first taper (4a) and the second taper (2a) are attached together.

2. The shield mount structure in a shielded motor rotor assembly of claim 1 wherein, An annular step (2b) is formed on the outer wall of the upper end cover (2), and the annular step (2b) is composed of an annular side surface (2b1) and an annular bottom surface (2b2); the second taper (2a) is formed on the annular side surface (2b1), and the top surface of the shielding cover (4) is pressed against the annular bottom surface (2b2).

3. The shield mounting structure in a shielded motor rotor assembly of claim 2 wherein, The upper side of the first taper (4a) extends to the top surface of the shielding cover (4), and the upper side of the second taper (2a) extends to the annular bottom surface (2b2).

4. The shield mount structure in a shielded motor rotor assembly of claim 3 wherein, The outer diameter of the top surface of the shielding cover (4) is smaller than the outer diameter of the annular bottom surface (2b2).

5. The shield mount structure in a shielded motor rotor assembly of claim 1 wherein, A tapered guide surface (3a) is formed on the outer side surface of the lower end of the lower end cover (3), the diameter of the guide surface (3a) gradually decreases from top to bottom, and the guide surface (3a) extends to the bottom surface of the lower end cover (3).

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