Shell of explosion-proof motor

Abstract

Radiating ribs are arranged on the surface of the casing, a junction box (1) is arranged on the casing (5), and the casing is characterized in that the inner wall of the middle of the casing is provided with a protruding portion (3) protruding inwards, the axial length of the protruding portion is slightly larger than the length of a stator iron core (4), the inner circle of the protruding portion is matched with the outer circle of the stator iron core, and the inner circle of the protruding portion is matched with the outer circle of the stator iron core. Large inner diameter parts (6) on the two sides of the protruding part are matched with a spigot (8) of the end cover, the axial length of the large inner diameter parts is larger than that of the spigot of the end cover, the box bottom of the junction box is communicated with the interior of the machine shell through a groove (2), the groove is formed in the left side of the protruding part, and the width of the groove is larger than the diameter of a stator winding lead. The junction box has the beneficial effects that the communication part of the box bottom of the junction box and the interior of the casing does not pass through the lug boss of the casing, the lug boss is continuously cut, the roundness of the lug boss can be ensured, and when the casing is turned, the inner claw 10 of the chuck 9 can be used for clamping the large-inner-diameter part of the casing, so that the clamping is convenient and firm.

Description

Technical Field

[0001] The utility model relates to a casing of an explosion-proof motor. Background Art

[0002] The existing explosion-proof motor casing has an inner wall of a constant diameter structure. The stator core is fixedly inserted in the middle section of the casing. The two ends of the casing are used to connect end covers. The surface of the casing is provided with heat dissipation ribs. The casing is provided with a junction box. The bottom of the junction box is connected to the inside of the casing. In this way, a notch is formed on the casing shell. When the inner wall of the casing is machined, intermittent cutting occurs at the notch, which reduces the roundness of the inner wall. In addition, a special fixture is required to clamp the workpiece during turning processing of the casing with this structure. Utility Model Content

[0003] In view of the above problems, the present invention proposes a casing for an explosion-proof motor, which is convenient to clamp and does not cause intermittent cutting during the processing, thereby helping to improve the processing quality.

[0004] The technical solution of the present utility model is a casing of an explosion-proof motor, wherein the surface of the casing 5 is provided with a heat dissipation rib 7, a junction box 1 is provided on the casing, and the bottom of the junction box is communicated with the interior of the casing, wherein the inner wall of the middle portion of the casing has an inwardly protruding protrusion 3, the axial length of the protrusion is slightly larger than the length of the stator core 4, the inner circle of the protrusion matches the outer circle of the stator core, the large inner diameter portions 6 on both sides of the protrusion match the stop 8 of the end cover, the axial length of the large inner diameter portion 6 is greater than the axial length of the stop of the end cover, the bottom of the junction box is communicated with the interior of the casing through a groove 2, the groove is located on the left side of the protrusion, and the groove width is greater than the diameter of the stator winding lead.

[0005] The beneficial effect of this casing is that the connection between the bottom of the junction box and the interior of the casing does not pass through the raised portion of the casing. The cutting of the raised portion is continuous cutting, which can ensure the roundness of the raised portion. When the casing is processed by turning, the inner claws 10 of the chuck 9 can be used to clamp the large inner diameter portion of the casing, which is convenient and firm. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a schematic structural diagram of the present invention. In the upper cross-sectional view of the figure, the heat dissipation ribs are not drawn.

[0007] Figure 2 for Figure 1 Left view of .

[0008] Figure symbols: 1-junction box, 2-groove, 3-protrusion, 4-stator core, 5-housing, 6-large inner diameter part, 7-heat dissipation rib, 8-stop, 9-chuck, 10-inner claw. DETAILED DESCRIPTION

[0009] A casing of an explosion-proof motor, wherein the surface of the casing 5 is provided with heat dissipation ribs 7, and the casing is provided with a junction box 1, characterized in that the inner wall of the middle part of the casing has an inwardly protruding protrusion 3, the axial length of the protrusion is slightly larger than the length of the stator core 4, the inner circle of the protrusion matches the outer circle of the stator core, the large inner diameter portions 6 on both sides of the protrusion match the stoppers 8 of the end cover, the axial length of the large inner diameter portions 6 is greater than the axial length of the stoppers 8 of the end cover, the bottom of the junction box is connected to the interior of the casing through a groove 2, the groove 2 is located on the left side of the protrusion, the groove width is larger than the stator winding lead diameter, and the groove width is taken as 3 times the stator winding lead diameter.

[0010] The casing can be processed on a lathe. The processing method is as follows: the large inner diameter part 6 at one end of the casing blank is clamped by the inner jaws 10 of the chuck 9, and the large inner diameter part 6 and the raised part at the other end are turned. During the turning process, the turning tool will not contact the groove, and the roundness of the machined surface can be ensured; then, the processed large inner diameter part 6 is clamped by the inner jaws 10 of the chuck 9, and the unprocessed large inner diameter part 6 is turned. Since the axial length of the large inner diameter part is much larger than the axial length of the stop 8 of the end cover, it is sufficient to turn the matching parts of the large inner diameter part and the stop of the end cover, and the turning tool will not contact the groove.

[0011] In order to firmly clamp the casing, the axial length of the large inner diameter portion 6 is 4 to 5 times the axial length of the stop 8 of the end cover.

Claims

1. The casing of an explosion-proof motor has heat dissipation ribs on its surface and a junction box (1) on the casing (5), which is characterized in that: The inner wall of the middle part of the casing has a protruding portion (3) protruding inward, the axial length of the protruding portion is slightly larger than the length of the stator core (4), the inner circle of the protruding portion matches the outer circle of the stator core, the large inner diameter portions (6) on both sides of the protruding portion match the stoppers (8) of the end cover, the axial length of the large inner diameter portions is larger than the axial length of the stoppers of the end cover, the bottom of the junction box is connected to the inside of the casing through a groove (2), the groove is located on the left side of the protruding portion, and the groove width is larger than the diameter of the stator winding lead.

2. The explosion-proof motor casing according to claim 1, characterized in that: The axial length of the large inner diameter portion is 4 times the axial length of the stopper of the end cover.

3. The explosion-proof motor casing according to claim 1, characterized in that: The groove width is 3 times the diameter of the stator winding lead.

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