Potting insulation end cover

Abstract

The utility model discloses a potting insulation end cover, which comprises an end cover base body, a bearing steel sleeve and an insulation spacer, the bearing steel sleeve is arranged on the end cover base body through an insulation screw, the insulation spacer is arranged between the bearing steel sleeve and the end cover base body and respectively contacted with the bearing steel sleeve and the end cover base body, and a gap is arranged between the bearing steel sleeve and the end cover base body. The gap is filled with an insulating layer; the potting insulation end cover not only can realize the high insulation function of the traditional insulation end cover, but also has the advantages of low cost and high batch manufacturing manufacturability.

Description

Technical Field

[0001] This utility model relates to the field of motor end cap technology, and more specifically to a potting insulating end cap. Background Technology

[0002] Inverter-driven motors suffer from shaft current corrosion due to the non-sinusoidal output voltage of the inverter, which exhibits rapidly changing du / dt. Given the motor's inherent capacitance and parasitic capacitance, according to I=C*du / dt, this generates shaft current, leading to bearing galvanic corrosion. Common methods for suppressing shaft current include conductive brushes and insulating end caps. Conductive brushes primarily bypass the shaft current from the bearing, but they cannot provide current bypass protection at low motor speeds (where the bearing oil film is not yet formed and bearing resistance is low). Furthermore, traditional insulating end caps utilize an insulating coating process, which is costly and prone to failure. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a potted insulating end cap that not only achieves the high insulation function of traditional insulating end caps, but also has the advantages of low cost and strong mass production processability.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An encapsulated insulating end cap includes an end cap base, a bearing steel sleeve, and an insulating gasket. The bearing steel sleeve is mounted on the end cap base by an insulating screw, and the insulating gasket is located between the bearing steel sleeve and the end cap base and contacts both of them. There is a gap between the bearing steel sleeve and the end cap base, and the gap is filled with an insulating layer.

[0006] Furthermore, the end cap substrate is provided with a first radial limiting structure and a first axial limiting structure at the gap between it and the bearing steel sleeve to prevent the insulation layer from sliding radially and axially.

[0007] Furthermore, the first radial limiting structure includes a plurality of first semi-circular grooves, and the first axial limiting structure includes at least one first axial annular groove, wherein the insulating layer is filled into the plurality of first semi-circular grooves and the first axial annular groove.

[0008] Furthermore, the bearing sleeve is provided with a second axial limiting structure and a second radial limiting structure at the gap between it and the end cover base to prevent the bearing sleeve from sliding axially and radially.

[0009] Furthermore, the second radial limiting structure includes a plurality of second semi-circular grooves, and the second axial limiting structure includes at least one second axial annular groove, wherein the insulating layer is filled into the plurality of second semi-circular grooves and the second axial annular groove.

[0010] Furthermore, a mounting cavity is provided on one side of the end cap base, and a plurality of mounting threaded holes are provided in the mounting cavity. The bearing steel sleeve is located in the mounting cavity, and a plurality of mounting through holes are provided on the bearing steel sleeve. The insulating screw passes through the mounting through holes and extends into the mounting threaded holes.

[0011] Furthermore, the insulating screw includes a mounting screw, a rubber sleeve, and an insulating plate. The rubber sleeve is located in the mounting through hole and contacts and abuts against the mounting screw and the bearing steel sleeve respectively. The insulating plate is located between the mounting through hole on the end face of the bearing steel sleeve and the screw head of the mounting screw.

[0012] Furthermore, the bearing steel sleeve end face is provided with an injection hole.

[0013] Furthermore, both the insulating gasket and the insulating board are made of epoxy board.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model, by setting up an end cap base, a bearing steel sleeve, and an insulating gasket, places the insulating gasket between the end cap base and the bearing steel sleeve during installation, creating a gap between them to prevent contact and conduction. An insulating layer is then filled into the gap, and an insulating screw is used for connection and pressing. This effectively ensures insulation between the end cap base and the bearing steel sleeve, achieving the high insulation function of a traditional insulating end cap.

[0016] 2. The potting insulating end cap of this utility model has a simple overall structure, strong mass production processability, and low manufacturing cost.

[0017] 3. By setting limiting structures on the end cover base and the bearing steel sleeve respectively, the sliding between the end cover base, the insulation layer and the bearing sleeve can be effectively prevented. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0019] Figure 1 This is a schematic diagram of the structure of a potting insulating end cap;

[0020] Figure 2 This is a cross-sectional view of a potted insulating end cap;

[0021] Figure 3 This is a schematic diagram of the end cap substrate structure;

[0022] Figure 4 This is a schematic diagram of the bearing steel sleeve.

[0023] Figure 5 for Figure 2 Enlarged view of point A in the middle.

[0024] The markings in the figure are as follows: 1. End cap base; 2. Bearing steel sleeve; 3. Insulating gasket; 4. Mounting screw; 5. Gap; 6. Mounting threaded hole; 7. Mounting through hole; 8. Rubber sleeve; 9. Insulating plate; 10. First axial annular groove; 11. Second axial annular groove; 12. Second semicircular groove; 13. Second semicircular groove. Detailed Implementation

[0025] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0027] A potted insulating end cap, such as Figure 1-3 As shown, it includes an end cap base 1, a bearing steel sleeve 2, and an insulating gasket 3. The bearing steel sleeve 2 is installed on the end cap base 1 by insulating screws, and the insulating gasket 3 is located between the bearing steel sleeve 2 and the end cap base 1 and contacts both of them. There is a gap 5 between the bearing steel sleeve 2 and the end cap base 1, and the gap 5 is filled with an insulating layer.

[0028] This utility model, by setting up an end cap base 1, a bearing steel sleeve 2, and an insulating gasket 3, places the insulating gasket 3 between the end cap base 1 and the bearing steel sleeve 2 during installation, creating a gap 5 between the bearing steel sleeve 2 and the end cap base 1, thus ensuring that they do not make contact and conduction. At the same time, an insulating layer is filled in the gap 5, and an insulating screw is used for connection and pressing, thereby effectively ensuring the insulation between the end cap base 1 and the bearing steel sleeve 2, achieving the high insulation function of traditional insulating end caps. Furthermore, this structure is simple to pot and insulate, has low manufacturing cost, and is highly processable for mass production.

[0029] In this embodiment, the preferred embodiment is as follows: Figure 3 and Figure 5 As shown, the end cap base 1 is provided with a first radial limiting structure and a first axial limiting structure at a gap 5 between it and the bearing steel sleeve 2 to prevent the insulation layer from sliding radially and axially.

[0030] In this embodiment, the preferred embodiment is as follows: Figure 3 and Figure 5 As shown, the first radial limiting structure includes a plurality of first semi-circular grooves 12, and the first axial limiting structure includes at least one first axial annular groove 10. The insulating layer is filled into the plurality of first semi-circular grooves 12 and the first axial annular groove 10.

[0031] Specifically, after the insulating material is filled into the gap 5, it will be simultaneously filled into several first semi-circular grooves 12 and first axial annular grooves 10, thereby forming semi-cylinders in several first semi-circular grooves 12 and forming convex rings in the first axial annular grooves 10, thereby achieving the effect of preventing the insulating layer from sliding radially and axially with the bearing steel sleeve 2.

[0032] In this embodiment, the preferred embodiment is as follows: Figure 4-5 As shown, the bearing steel sleeve 2 is provided with a second axial limiting structure and a second radial limiting structure at a gap 5 between it and the end cover base 1 to prevent the bearing steel sleeve 2 from sliding axially and radially.

[0033] In this embodiment, the preferred embodiment is as follows: Figure 4-5 As shown, the second radial limiting structure includes a plurality of second semi-circular grooves 13, and the second axial limiting structure includes at least one second axial annular groove 11. The insulating layer is filled into the plurality of second semi-circular grooves 13 and the second axial annular groove 11.

[0034] Specifically, after the insulating material is filled into the gap 5, it will be simultaneously filled into several second semi-circular grooves 13 and second axial annular grooves 11, thereby forming semi-cylinders in several second semi-circular grooves 13 and forming convex rings in the second axial annular grooves 11, thereby achieving the effect of preventing the insulating layer from sliding radially and axially with the bearing steel sleeve 2.

[0035] In this preferred embodiment, a mounting cavity is provided on one side of the end cap base, and a plurality of mounting threaded holes 6 are provided in the mounting cavity. The bearing steel sleeve 2 is located in the mounting cavity, and a plurality of mounting through holes 7 are provided on the bearing steel sleeve 2. The insulating screw passes through the mounting through holes 7 and extends into the mounting threaded holes 6.

[0036] In this embodiment, the preferred embodiment is as follows: Figure 5 As shown, the insulating screw includes a mounting screw 4, a rubber sleeve 8, and an insulating plate 9. The rubber sleeve 8 is located in the mounting through hole 7 and contacts and abuts against the mounting screw 4 and the bearing steel sleeve 2 respectively. The insulating plate 9 is located between the mounting through hole 7 on the end face of the bearing steel sleeve 2 and the screw head of the mounting screw 4. Thus, after the mounting screw 4 locks the end cover base 1 and the bearing steel sleeve 2, an insulating locking connection between the end cover base 1 and the bearing steel sleeve 2 can be achieved.

[0037] In this preferred embodiment, the bearing steel sleeve 2 is provided with an injection hole on its end face. The injection hole can communicate with the second semi-circular groove 13, so that insulating material can be injected into the gap 5 through the injection hole to form an insulating layer.

[0038] In this embodiment, preferably, both the insulating pad 3 and the insulating plate 9 are made of epoxy board, which has a simple structure, is easy to manufacture, and has high insulation resistance.

[0039] In this embodiment, the insulating layer is preferably made of an irreversible molding resin material and is filled into the gap 5 by potting or injection molding, which has the characteristics of high structural reliability and high resistance.

[0040] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A potted insulating end cap, characterized in that: The device includes an end cap base, a bearing steel sleeve, and an insulating gasket. The bearing steel sleeve is installed on the end cap base by insulating screws, and the insulating gasket is located between the bearing steel sleeve and the end cap base and contacts both of them. There is a gap between the bearing steel sleeve and the end cap base, and the gap is filled with an insulating layer. An injection hole is provided on the end face of the bearing steel sleeve. The end cap base is provided with a first radial limiting structure and a first axial limiting structure at the gap between it and the bearing steel sleeve to prevent the insulation layer from sliding radially and axially.

2. The potted insulating end cap according to claim 1, characterized in that: The first radial limiting structure includes a plurality of first semi-circular grooves, and the first axial limiting structure includes at least one first axial annular groove. The insulating layer is filled into the plurality of first semi-circular grooves and the first axial annular groove.

3. The potted insulating end cap according to claim 1, characterized in that: The bearing sleeve is provided with a second axial limiting structure and a second radial limiting structure at the gap between it and the end cover base to prevent the bearing sleeve from sliding axially and radially.

4. The potted insulating end cap according to claim 3, characterized in that: The second radial limiting structure includes a plurality of second semi-circular grooves, and the second axial limiting structure includes at least one second axial annular groove. The insulating layer is filled into the plurality of second semi-circular grooves and the second axial annular groove.

5. The potted insulating end cap according to claim 1, characterized in that: The end cap base has a mounting cavity on one side, and a plurality of mounting threaded holes are provided in the mounting cavity. The bearing steel sleeve is located in the mounting cavity, and a plurality of mounting through holes are provided on the bearing steel sleeve. The insulating screw passes through the mounting through holes and extends into the mounting threaded holes.

6. The potted insulating end cap according to claim 5, characterized in that: The insulating screw includes a mounting screw, a rubber sleeve, and an insulating plate. The rubber sleeve is located in the mounting through hole and contacts and abuts against the mounting screw and the bearing steel sleeve respectively. The insulating plate is located between the mounting through hole on the end face of the bearing steel sleeve and the screw head of the mounting screw.

7. The potted insulating end cap according to claim 1, characterized in that: Both the insulating gasket and the insulating board are made of epoxy board.

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