A locking structure for connecting a copper pipe and a taper ring of a large motor

Abstract

This utility model relates to an anti-loosening connection structure for connecting copper tubes and a conical ring in a large motor. It includes multiple fiberglass retaining blocks disposed on the outer circumference of the conical ring. The fiberglass retaining blocks and the conical ring are fixed together by a screw assembly. Multiple connecting copper tubes are embedded in the fiberglass retaining blocks and secured to them by fiberglass tape. The outer end face of the fiberglass retaining blocks away from the conical ring has multiple retaining grooves for accommodating the embedded copper tubes. The screw assembly includes multiple rectangular holes disposed on the fiberglass retaining blocks, with a screw extending through the fiberglass retaining blocks to the conical ring. The end of the screw has a nut that connects the screw to the inside of the conical ring. Polyester felt is glued and embedded in the rectangular holes near the nut, and an insulating plate is embedded inside the polyester felt. This utility model has the following advantages: ensuring the stability of the connection between the connecting copper tubes and the conical ring, and preventing motor overheating and aging due to structural loosening.

Description

Technical Field

[0001] This utility model belongs to the field of large motors, and specifically relates to an anti-loosening connection structure for connecting copper tubes and conical rings in large motors. Background Technology

[0002] The parallel ring assembly at the end of a large motor (multiple connecting copper tubes are installed on the outer circumference of a conical ring to form a parallel ring assembly) can suppress rotor oscillation, especially in the event of sudden load changes or grid disturbances, and help the motor quickly restore synchronous speed. The parallel ring acts as a structural support, enhances the mechanical strength of the rotor end, and prevents deformation of the conductor bars or windings.

[0003] The outer circumference of the conical ring of the parallel ring assembly requires the installation of multiple arc-shaped connecting copper tubes. These connecting copper tubes have excellent conductivity, efficiently transmit current, and reduce energy loss at the connection points. The tubular structure of the connecting copper tubes can enhance heat dissipation through natural convection or forced air cooling. The multiple connecting copper tubes are non-closed arc structures and need to be arranged in a circular shape and installed on the outer circumference of the parallel ring.

[0004] Currently, a bakelite bracket is installed between the connecting copper tube and the conical ring. Although the bakelite bracket has good insulation, it has low mechanical strength and is prone to cracking or vibration under long-term vibration or thermal stress. This can cause the connection between the bakelite bracket and the conical ring to loosen, leading to displacement of the connecting copper tube and affecting the conductivity of the motor. At the same time, the loose connection causes a sharp increase in resistance, which can cause the motor to overheat and accelerate its aging. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide an anti-loosening connection structure for connecting copper tubes and conical rings of large motors, ensuring the stability of the connection between the copper tubes and conical rings and avoiding motor overheating and aging caused by structural loosening.

[0006] The purpose of this utility model is achieved through the following technical solution: a non-loosening connection structure for connecting copper tubes and conical rings of large motors, including multiple glass fiber limiting blocks set on the outer circumference of the conical ring, the glass fiber limiting blocks and the conical ring being fixed by a screw assembly, and multiple connecting copper tubes being embedded in the glass fiber limiting blocks and fixed to the connecting copper tubes and the glass fiber limiting blocks by binding with glass fiber tape;

[0007] The outer end face of the glass fiber limiting block away from the conical ring has multiple limiting grooves for connecting copper tubes. The multiple limiting grooves on each glass fiber limiting block are distributed from top to bottom. The glass fiber limiting block has binding through holes near the limiting grooves.

[0008] The screw assembly includes multiple rectangular holes provided on the glass fiber limiting block, a screw extending through the glass fiber limiting block to the conical ring, and a nut at the end of the screw connecting the screw to the conical ring. Polyester felt is glued and embedded in the rectangular holes near the nut, and an insulating plate is embedded inside the polyester felt.

[0009] A further improvement of this utility model is that the distribution direction of the multiple rectangular holes is consistent with the distribution direction of the multiple limiting grooves, and the opening direction of the rectangular holes is perpendicular to the extension direction of the screw.

[0010] A further improvement of this utility model is that the end face of the glass fiber limiting block near the conical ring is an arc surface that fits with the outer end face of the conical ring. The arc surface has multiple grooves, and conformal ropes are glued into the grooves. The conformal ropes are fixed to the outer end face of the conical ring by adhesive.

[0011] A further improvement of this utility model is that: the limiting groove has a buffer polyester felt that contacts the connecting copper pipe, and the buffer polyester felt is fixed to the inner wall of the limiting groove by adhesive.

[0012] A further improvement of this utility model is that: binding through holes are provided on the upper and lower sides of the glass fiber limiting block near each limiting groove, and the glass fiber tape passes through the corresponding two binding through holes to cross-bind the connecting copper pipe.

[0013] A further improvement of this invention is that the glass fiber tape is impregnated with epoxy resin.

[0014] This utility model has the following advantages compared with the prior art:

[0015] 1. This utility model replaces the original bakelite bracket connecting the copper tube and the conical ring with a fiberglass limiting block. The fiberglass limiting block and the conical ring are fixed by a screw and a nut. The fiberglass limiting block and the connecting copper tube are then bound and fixed by a fiberglass tape. The screw ensures tight contact between the connecting copper tube and the conical ring through pre-tightening force, reducing contact resistance and preventing motor overheating. The screw provides rigid fixation to prevent displacement of the connecting copper tube and the conical ring under large vibration or impact. The fiberglass tape evenly distributes the surface pressure of the connecting copper tube, avoiding local stress concentration on the screw that could lead to screw deformation or cracking.

[0016] 2. Compared to traditional bakelite brackets, the fiberglass limiting block in this invention has high mechanical strength and high heat resistance. It is less prone to micro-cracks under long-term alternating stress, making it suitable for the high-frequency vibration environment of high-speed motors. Polyester felt is placed around the nut that locks the screw to increase friction and adhesion, preventing the threaded connection from loosening due to vibration or external force. A conformal rope is placed on the arc surface where the fiberglass limiting block meets the conical ring, further absorbing vibration and impact energy and reducing fretting wear on the conical ring. When the motor is running, the conical ring expands due to temperature rise, and the conformal rope maintains contact pressure through elastic deformation, preventing the gap from widening and causing loosening. The compressibility of the insulating plate enhances the stability of the nut's preload, indirectly improving the overall connection reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 for Figure 1 Enlarged schematic diagram of the middle screw assembly.

[0019] Figure 3 This is a schematic diagram of the fiberglass tape binding structure in Embodiment 2 of this utility model.

[0020] Numbering on the map:

[0021] 1-Connecting copper pipe, 2-Conical ring, 3-Glass fiber limiting block, 4-Screw assembly, 5-Glass fiber tape, 6-Limiting groove, 7-Binding through hole, 8-Arc surface, 9-Insertion groove, 10-Conforming rope, 11-Buffer polyester felt.

[0022] 41-Rectangular hole, 42-Screw, 43-Nut, 44-Polyester felt, 45-Insulating board. Detailed Implementation

[0023] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship, such as those based on the orientation or positional relationship shown in the drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure or unit referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] In this utility model, unless otherwise explicitly specified and limited, terms such as “connection,” “provided with,” and “have” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can be described as a mechanical connection, a direct connection, or a connection through an intermediate medium. Those skilled in the art can understand the basic meaning of the above terms in this utility model according to the specific circumstances. Example 1

[0026] A loosening prevention connection structure for connecting copper tubes and conical rings in large motors, as described in reference. Figure 1 It includes multiple glass fiber limiting blocks 3 set on the outer circumference of the conical ring 2. The glass fiber limiting blocks 3 and the conical ring 2 are fixed by a screw assembly 4. Multiple connecting copper tubes 1 are embedded in the glass fiber limiting blocks 3 and are fixed by binding with glass fiber tape 5.

[0027] The outer end face of the glass fiber limiting block 3 away from the conical ring 2 has multiple limiting grooves 6 for connecting copper tubes 1. The multiple limiting grooves 6 on each glass fiber limiting block 3 are distributed from top to bottom. The glass fiber limiting block 3 has binding through holes 7 near the limiting grooves 6.

[0028] Reference Figure 2 The screw assembly 4 includes a plurality of rectangular holes 41 disposed on the glass fiber limiting block 3, and a screw 42 is provided through the glass fiber limiting block 3 to the conical ring 2. The end of the screw 42 has a nut 43 that connects the screw 42 to the conical ring 2. A polyester felt 44 is glued and embedded in the rectangular holes 41 near the nut 43. An insulating plate 45 is embedded inside the polyester felt 44.

[0029] This invention replaces the original bakelite bracket connecting the copper tube 1 and the conical ring 2 with a fiberglass retaining block 3, which has high mechanical strength and high heat resistance. It is not prone to micro-cracks under long-term alternating stress, making it suitable for the high-frequency vibration environment of high-speed motors. The fiberglass retaining block 3 and the conical ring 2 are fixed by a screw 42 and a nut 43. The fiberglass retaining block 3 and the connecting copper tube 1 are then bound and fixed by a fiberglass tape 5. The screw 42 ensures tight contact between the connecting copper tube 1 and the conical ring 2 through pre-tightening force, reducing contact resistance and preventing motor overheating. The screw 42 provides rigid fixation to prevent displacement of the connecting copper tube 1 and the conical ring 2 under large vibration or impact. The fiberglass tape 5 evenly distributes the surface pressure of the connecting copper tube 1, avoiding local stress concentration in the screw that could lead to screw deformation or cracking.

[0030] This invention provides a polyester felt 44 around the nut 43 that is locked by the screw 42, which increases friction and adhesion and prevents the threaded connection from loosening due to vibration or external force; the compressibility of the insulating plate 45 can enhance the stability of the nut's preload, indirectly improving the overall connection reliability.

[0031] Based on this embodiment, the distribution direction of the multiple rectangular holes 41 is consistent with the distribution direction of the multiple limiting grooves 6, and the opening direction of the rectangular holes 41 is perpendicular to the extension direction of the screw 42.

[0032] Based on this embodiment, the end face of the glass fiber limiting block 3 near the conical ring 2 is an arc surface 8 that fits with the outer end face of the conical ring 2. The arc surface 8 has multiple grooves 9, and a conformal rope 10 is glued into the grooves 9. The conformal rope 10 is fixed to the outer end face of the conical ring 2 by adhesive.

[0033] This invention provides a conformal rope 10 that is in close contact with the conical ring 2 on the arc surface 8 where the glass fiber limiting block 3 and the conical ring 2 meet. This further absorbs vibration and impact energy and reduces the fretting wear of the conical ring 2. When the motor is running, the conical ring 2 expands due to temperature rise, and the conformal rope 10 maintains the contact pressure through elastic deformation, preventing the gap from widening and causing loosening.

[0034] Based on this embodiment, the limiting groove 6 has a buffer polyester felt 11 that contacts the connecting copper pipe 1, and the buffer polyester felt 11 is fixed to the inner wall of the limiting groove 6 by adhesive.

[0035] The conformal rope 10, polyester felt 44, and buffer polyester felt 11 in this utility model all have certain elasticity and vibration absorption properties, which can absorb the slight vibration during motor operation and reduce the loosening of nut 43. Example 2

[0036] Based on the above embodiments, referring to Figure 3 Each fiberglass limiting block 3 has binding holes 7 located near the upper and lower sides of each limiting groove 6. Fiberglass strips 5 pass through the corresponding two binding holes 7 to cross-bind the connecting copper pipe 1.

[0037] The mesh structure formed by cross binding can suppress radial vibration, prevent the connecting copper tube 1 from separating from the glass fiber limiting block 3, and the elastic distribution of cross binding can better absorb the high-frequency vibration energy during operation, reducing the risk of fatigue fracture.

[0038] Furthermore, the fiberglass tape 5 is impregnated with epoxy resin and cured at room temperature for 24 hours before being used to bind the connecting copper pipe. Epoxy resin has excellent dielectric properties, and the fiberglass tape 5 itself is an insulating material. The combination of the two can effectively isolate and insulate, preventing short circuits or leakage. At the same time, the high tensile strength of the fiberglass tape 5 and the adhesiveness of the epoxy resin combine to form a rigid protective layer, preventing deformation or displacement under electromagnetic force or vibration. It has high hardness, is firmly bound, and prevents loosening and displacement. The cured fiberglass tape 5 can withstand high electric field strength.

[0039] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A non-loosening connection structure for connecting copper pipes and conical rings in large motors, characterized in that: It includes multiple glass fiber limiting blocks (3) set on the outer circumference of the conical ring (2), the glass fiber limiting blocks (3) and the conical ring (2) are fixed by a screw assembly (4), and multiple connecting copper pipes (1) are embedded in the glass fiber limiting blocks (3) and fixed by binding with glass fiber tape (5); The outer end face of the glass fiber limiting block (3) away from the conical ring (2) has multiple limiting grooves (6) for connecting copper tubes (1) to be embedded. The multiple limiting grooves (6) on each glass fiber limiting block (3) are distributed from top to bottom. The glass fiber limiting block (3) has binding through holes (7) near the limiting grooves (6). The screw assembly (4) includes a plurality of rectangular holes (41) provided on the glass fiber limiting block (3), and a screw (42) extending through the glass fiber limiting block (3) to the conical ring (2). The end of the screw (42) has a nut (43) that connects the screw (42) to the conical ring (2). A polyester felt (44) is glued and embedded in the rectangular holes (41) near the nut (43). An insulating plate (45) is embedded inside the polyester felt (44).

2. The anti-loosening connection structure for connecting copper pipe and conical ring of a large motor according to claim 1, characterized in that: The distribution direction of the plurality of rectangular holes (41) is consistent with the distribution direction of the plurality of limiting grooves (6), and the opening direction of the rectangular holes (41) is perpendicular to the extension direction of the screw (42).

3. The anti-loosening connection structure for connecting copper pipe and conical ring of a large motor according to claim 2, characterized in that: The end face of the glass fiber limiting block (3) near the conical ring (2) is an arc surface (8) that fits against the outer end face of the conical ring (2). The arc surface (8) has multiple grooves (9). A conformal rope (10) is glued into the groove (9). The conformal rope (10) is fixed to the outer end face of the conical ring (2) by adhesive.

4. The anti-loosening connection structure for connecting copper pipe and conical ring of a large motor according to claim 3, characterized in that: The limiting groove (6) has a buffer polyester felt (11) that is in contact with the connecting copper pipe (1). The buffer polyester felt (11) is fixed to the inner wall of the limiting groove (6) by adhesive.

5. The anti-loosening connection structure for connecting copper pipe and conical ring of a large motor according to claim 4, characterized in that: The glass fiber limiting block (3) is provided with binding through holes (7) on the upper and lower sides of each limiting groove (6). The glass fiber strip (5) passes through the corresponding two binding through holes (7) to cross-bind the connecting copper pipe (1).

6. The anti-loosening connection structure for connecting copper pipe and conical ring of a large motor according to claim 5, characterized in that: The glass fiber tape (5) is impregnated with epoxy resin.

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