A double-fed generator rotor lead protection device

Abstract

A kind of double-fed generator rotor lead-out line protection device, including motor body, motor shaft is connected on motor body, protective gland is installed outside motor body, rotor lead-out line is provided in motor body, rotor lead-out line is passed through protective gland to motor shaft, internal protection mechanism is arranged in protective gland, external protection mechanism is installed in the end of motor body towards the part of rotor lead-out line, the utility model can play the protection effect to rotor lead-out line in motor body by internal protection mechanism installed in protective gland and external protection mechanism installed on motor shaft, the guiding column of internal protection mechanism can guide rotor lead-out line while preventing excessive bending of rotor lead-out line, rotor lead-out line is filled and fixed using conforming felt layer and no-width band in protective sleeve, avoid the deviation wear of rotor lead-out line, avoid the damage of rotor lead-out line in use process, improve the use efficiency of rotor lead-out line.

Description

Technical Field

[0001] This utility model relates to the field of rotor lead wire protection technology, and in particular to a rotor lead wire protection device for a doubly fed generator. Background Technology

[0002] The three-phase leads of the doubly fed generator rotor are all made of bent copper busbars. The lower part of the rotor leads is padded with insulating felt of a certain thickness at the connection point between the lead wire and the shaft cable and the shaft position. The upper part is fixed by wrapping the lead wire around the circumference multiple times.

[0003] In the existing technology, frequent fractures occur at the lower R-angle of the three-phase lead wires of the generator rotor. The main reason is that the connection between the lower part of the rotor lead wires and the shaft cable is not securely fixed. When the generator is running, the R-angle of the generator rotor lead wires is always subjected to the combined effects of centrifugal force, torsional stress and alternating heat effect, which eventually leads to fatigue fracture. This results in longer downtime for the wind turbine, loss of power generation, and serious impact on production efficiency.

[0004] Therefore, it is essential to provide a protection device for the rotor lead wires of a doubly-fed generator to address the shortcomings of existing technologies. Utility Model Content

[0005] The purpose of this invention is to provide a protective device for the rotor leads of a doubly-fed generator, overcoming the shortcomings of existing technologies. This invention protects the rotor leads in the motor body through an internal protective mechanism installed in the protective cover and an external protective mechanism installed on the motor shaft. The guide post installed in the internal protective mechanism guides the rotor leads while preventing excessive bending. The rotor leads are filled and fixed in the protective sleeve using a conformal felt layer and a non-woven belt, preventing the rotor leads from shifting and wearing, avoiding damage to the rotor leads during use, and improving the efficiency of rotor lead usage.

[0006] The above-mentioned objectives of this utility model are achieved through the following technical means.

[0007] A protective device for rotor lead wires of a doubly fed generator is provided, including a motor body, a motor shaft connected to the motor body, a protective cover installed on the outside of the motor body, a rotor lead wire installed inside the motor body, the rotor lead wire passing through the protective cover to the motor shaft, an internal protective mechanism installed in the protective cover, and an external protective mechanism installed at the end of the motor body where the rotor lead wires pass through. The internal protection mechanism includes a lead wire channel, a guide post installed in the upper half of the lead wire channel, the guide post being installed in conjunction with the lead wire channel, a protective sleeve installed in the middle section of the lead wire channel, and a bend at the end of the lead wire channel, with an auxiliary wire guide wheel installed inside the bend.

[0008] Specifically, the external protective mechanism includes a protective sleeve, which is installed on the motor shaft. The protective sleeve has a cable outlet and a protective sleeve shoulder is installed on the other end of the protective sleeve.

[0009] Specifically, the protective sleeve is equipped with a conformal felt layer and a non-woven belt inside.

[0010] Specifically, the auxiliary cable guide wheels are installed at the upper and lower ends of the bend, and the auxiliary cable guide wheels are installed in parallel with each other.

[0011] Specifically, a bending space is provided in the middle section of the lead channel, and the inner diameter of the bending space is larger than the diameter of the lead wire.

[0012] This invention protects the rotor leads in the motor body through an internal protective mechanism installed in the protective cover and an external protective mechanism installed on the motor shaft. The guide post installed in the internal protective mechanism guides the rotor leads and prevents them from bending excessively. The protective sleeve uses a conformal felt layer and a non-woven tape to fill and fix the rotor leads, preventing them from shifting or wearing off and avoiding damage during use, thus improving the efficiency of the rotor leads. Attached Figure Description

[0013] The present invention will be further described with reference to the accompanying drawings, but the content of the drawings does not constitute any limitation on the present invention.

[0014] Figure 1 This is a front view of a protective device for the rotor lead wires of a doubly fed generator according to this utility model.

[0015] Figure 2 This utility model relates to a protective device for the rotor lead wires of a doubly-fed generator. Figure 1 A magnified view of a portion of point A in the middle.

[0016] Figure 3 This is a schematic diagram of the external protection mechanism in a doubly fed generator rotor lead wire protection device of this utility model.

[0017] Figure 4 This is a cross-sectional view of the protective sleeve in a protective device for the rotor lead wire of a doubly fed generator according to this utility model.

[0018] from Figures 1 to 4 Including: 1. Motor body; 2. Motor shaft; 3. Protective pressure cap; 4. Rotor leads; 5. Internal protective mechanisms; 6. External protective structure; 7. Lead wire channel; 8. Guide pillars; 9. Protective sleeve; 10. Bending section; 11. Auxiliary cable routing wheel; 12. Protective cover; 13. Cable outlet; 14. Shoulder guards; 15. Conformal felt layer; 16. No latitudinal zones; 17. Bending space. Detailed Implementation

[0019] The present invention will be further described in conjunction with the following embodiments.

[0020] Example 1. like Figure 1-4 As shown, a protective device for the rotor lead wire of a doubly fed generator includes a motor body 1, a motor shaft 2 connected to the motor body 1, a protective cover 3 installed on the outside of the motor body 1, and the protective cover 3 connected to the motor body 1 by bolts. The edge of the protective cover 3 is provided with a sealing strip, which can enhance the sealing between the protective cover 3 and the motor body 1 and prevent dust and moisture from entering. The protective cover 3 is made of high-strength alloy material, which has good strength and wear resistance, and can effectively protect the internal structure of the motor body 1.

[0021] The motor body 1 has a rotor lead wire 4 inside. The rotor lead wire 4 passes through the protective cover 3 to the motor shaft 2. The protective cover 3 has an internal protective mechanism 5. The part of the motor body 1 that leads out of the rotor lead wire 4 is equipped with an external protective mechanism 6.

[0022] The internal protection mechanism 5 includes a lead wire channel 7. A guide post 8 is installed on the upper half of the lead wire channel 7. The guide post 8 is a cylindrical structure and is evenly distributed on the inner wall of the upper half of the lead wire channel 7. The guide post 8 and the lead wire channel 7 are integrally formed. The guide post 8 can guide the rotor lead wire 4, prevent the rotor lead wire 4 from shifting and shaking in the lead wire channel 7, and reduce friction with the inner wall of the lead wire channel 7.

[0023] A protective sleeve 9 is provided in the middle section of the lead wire channel 7. The protective sleeve 9 is made of high temperature resistant insulating material, which can withstand the high temperature environment during generator operation and also plays an insulating role. Inside the protective sleeve 9, there is a conformal felt layer 15 and a non-woven tape 16. The conformal felt layer 15 is wrapped around the outside of the rotor lead wire 4 and can fit tightly with the rotor lead wire 4, playing a buffering and insulating role. The non-woven tape 16 is wrapped around the outside of the conformal felt layer 15, which can enhance the structural strength of the protective sleeve 9 and further protect the rotor lead wire 4.

[0024] The lead wire channel 7 is also provided with a bending space 17 in the middle section. The inner diameter of the bending space 17 is larger than the diameter of the lead wire, which provides a certain amount of room for the rotor lead wire 4 to move and avoid the lead wire being overstretched at the bend. Several buffer protrusions are provided in the bending space 17. The buffer protrusions are evenly distributed on the inner wall of the bending space 17. The buffer protrusions are made of elastic material and can play a buffering role when the rotor lead wire 4 shakes, reducing the collision between the lead wire and the inner wall of the bending space 17.

[0025] The lead wire channel 7 has a bend 10 at its end. An auxiliary wire guide wheel 11 is installed inside the bend 10. The auxiliary wire guide wheels 11 are installed at the upper and lower ends of the bend 10 and are installed in parallel with each other. The auxiliary wire guide wheel 11 includes a wheel body and a wheel axle. The wheel axle is fixed on the inner wall of the bend 10. The wheel body can rotate around the wheel axle. The outer surface of the wheel body is provided with an arc-shaped groove. The arc-shaped groove is adapted to the outer diameter of the rotor lead wire 4. The rotor lead wire 4 passes through the arc-shaped groove. When the rotor lead wire 4 moves, the wheel body rotates accordingly, which can reduce the friction between the lead wire and the bend 10 and protect the lead wire from damage.

[0026] The external protective mechanism 6 includes a protective sleeve 12, which is installed on the motor shaft 2. The protective sleeve 12 has a cable outlet 13, the diameter of which is larger than the diameter of the rotor lead wire 4. A rubber sealing ring is provided at the cable outlet 13. The inner diameter of the rubber sealing ring is matched with the outer diameter of the rotor lead wire 4, and the outer diameter of the rubber sealing ring is matched with the diameter of the cable outlet 13. The rubber sealing ring can enhance the sealing performance at the cable outlet 13 and prevent dust, moisture, etc. from entering the interior of the protective sleeve 12 through the cable outlet 13.

[0027] The other end of the protective sleeve 12 is equipped with a protective sleeve shoulder 14. The protective sleeve shoulder 14 and the protective sleeve 12 are integrally formed. The outer diameter of the protective sleeve shoulder 14 is larger than the outer diameter of the protective sleeve 12, which can increase the contact area with the motor body 1 and improve the installation stability of the external protection mechanism 6.

[0028] This utility model can protect the rotor lead wire 4 in the motor body 1 through the internal protective mechanism 5 installed in the protective cover 3 and the external protective mechanism 6 installed on the motor shaft 2. The guide post 8 installed in the internal protective mechanism 5 can guide the rotor lead wire 4 and prevent the rotor lead wire 4 from being excessively bent. The rotor lead wire 4 is filled and fixed in the protective sleeve 9 by the conformal felt layer 15 and the non-woven tape 16, so as to avoid the rotor lead wire 4 from being offset and worn, avoid the rotor lead wire 4 from being damaged during use, and improve the efficiency of the rotor lead wire 4.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A protective device for the rotor lead wires of a doubly-fed generator, characterized in that: Includes a motor body, a motor shaft connected to the motor body, a protective cover installed on the outside of the motor body, a rotor lead wire provided inside the motor body, the rotor lead wire passing through the protective cover to the motor shaft, an internal protective mechanism provided in the protective cover, and an external protective mechanism installed on the part of the motor body that extends toward the rotor lead wire; The internal protection mechanism includes a lead wire channel, a guide post installed in the upper half of the lead wire channel, the guide post being installed in conjunction with the lead wire channel, a protective sleeve provided in the middle section of the lead wire channel, and a bend provided at the end of the lead wire channel, with an auxiliary wire guide wheel installed inside the bend.

2. The doubly-fed generator rotor lead protection device according to claim 1, characterized in that: The external protective mechanism includes a protective sleeve that is fitted onto the motor shaft. The protective sleeve has a cable outlet and a protective shoulder is installed at the other end of the protective sleeve.

3. The doubly-fed generator rotor lead wire protection device according to claim 2, characterized in that: The protective sleeve is internally provided with a conformal felt layer and a non-woven belt.

4. The doubly-fed generator rotor lead protection device according to claim 3, characterized in that: The auxiliary cable guide wheels are installed at the upper and lower ends of the bent portion, and the auxiliary cable guide wheels are installed in parallel with each other.

5. The doubly-fed generator rotor lead protection device according to claim 4, characterized in that: The middle section of the lead channel is also provided with a bending space, the inner diameter of which is larger than the diameter of the lead wire.

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