Direct-cooling doubly-fed generator noise reduction device and method considering noise characteristics, and generator

Abstract

The invention belongs to the technical field of noise reduction of direct-cooling doubly-fed wind driven generators, and provides a noise reduction device and method for a direct-cooling doubly-fed generator considering noise characteristics and a generator, which consider the noise characteristics of aerodynamic noise, mechanical noise, electromagnetic noise, vibration noise and the like from a noise generation mechanism. From noise sources such as a base bottom, a base stator junction box, a base heater, a front end cover, a rear end cover, a cooler main body, a cooler air outlet, a slip ring chamber and the like for generating and transmitting noise with various characteristics, noise reduction mechanisms of which noise reduction materials are foamed aluminum plates are respectively arranged on the noise sources, and the noise generation mechanism is started. The characteristics of aerodynamic noise, mechanical noise, electromagnetic noise, vibration noise and the like are considered, foamed aluminum plates are arranged on source parts corresponding to the positions where noise is generated by the generator for noise reduction, and the problem that noise reduction of an existing direct-cooling doubly-fed generator is easy to fall off and age due to the fact that a sound-absorbing material is adopted is solved. Generation of noise of the generator is effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of noise reduction of direct-cooled doubly-fed wind turbine generators, and in particular relates to a noise reduction device, method and generator for a direct-cooled doubly-fed turbine generator taking noise characteristics into consideration. Background Art

[0002] A wind turbine is an electrical device that converts wind energy into mechanical energy, which drives the rotor to rotate and finally outputs alternating current. Doubly-fed generators are the most widely used generators in wind turbines. The cooling methods of doubly-fed generators include air-water cooling, air-to-air cooling, and direct cooling. At present, due to the cost of doubly-fed generators, direct-cooled doubly-fed generators are widely used. The air outlet of a direct-cooled generator directly discharges the air out of the cabin, and the noise inside the generator is directly discharged, which seriously affects the rest of residents near the wind turbine. Therefore, solving the noise problem of direct-cooled generators has become an urgent problem to be solved for direct-cooled doubly-fed generators. At present, the method of reducing noise in direct-cooled doubly-fed generators is usually to install sound-absorbing cotton on the inside of the generator outlet to reduce noise.

[0003] The noise reduction method of installing sound-absorbing cotton on the inside of the generator air outlet has limited noise reduction effect and cannot fundamentally reduce the generator noise problem. There is a risk of the sound-absorbing cotton falling off during long-term operation. The risk of falling off can be reduced by adding a wire mesh to fix the silencer cotton, but it increases the cost and affects the silencer effect. In addition, due to the high temperature of the generator air outlet, the silencer cotton is aged and there is a risk of falling off during long-term operation. In summary, the current method of reducing noise for direct-cooled doubly fed generators has problems such as poor sound-absorbing effect and easy aging of sound-absorbing materials. At the same time, the current method of reducing noise for direct-cooled doubly fed generators does not consider the characteristics and generation mechanism of the noise generated by the generator from different angles, nor does it set refined noise reduction measures based on the characteristics and generation mechanism of the noise, resulting in poor noise reduction effect and failure to fundamentally reduce the generator noise. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a direct-cooled doubly-fed generator noise reduction device, method and generator taking into account noise characteristics. Starting from the noise generation mechanism, taking into account the characteristics of aerodynamic noise, mechanical noise, electromagnetic noise and vibration noise, and considering from various angles of noise generation, foam aluminum plates are set at various noise-generating positions of the generator to reduce noise, thereby preventing the sound-absorbing material from easily falling off and aging, effectively reducing the generation of generator noise, blocking the propagation of generator noise, fundamentally reducing the generator noise, and improving the environmental friendliness of the wind turbine generator set.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present invention provides a direct-cooled doubly-fed generator noise reduction device taking into account noise characteristics, adopting the following technical solutions:

[0006] A noise reduction device for a direct-cooled double-fed generator taking noise characteristics into consideration comprises a plurality of noise reduction mechanisms arranged at corresponding positions of the generator; wherein the plurality of noise reduction mechanisms comprise a base bottom surface noise reduction mechanism, a base stator junction box surface noise reduction mechanism, a base heater surface noise reduction mechanism, a front end cover noise reduction mechanism, a rear end cover noise reduction mechanism, a cooler body noise reduction mechanism, a cooler air outlet noise reduction mechanism, a slip ring chamber front and rear surface noise reduction mechanism, and a slip ring chamber side and top surface noise reduction mechanism;

[0007] The noise reduction mechanisms at the front and rear surfaces of the slip ring chamber and the noise reduction mechanisms at the side and top surfaces of the slip ring chamber respectively use a first foam aluminum plate and a stainless steel plate composite plate and a second foam aluminum plate and a stainless steel plate composite plate as noise reduction materials, and other noise reduction mechanisms use foam aluminum plates as noise reduction materials; in the noise reduction mechanism of the cooler main body, an opening of the foam aluminum plate at the air outlet of the cooler is provided; the foam aluminum plates in the front cover noise reduction mechanism and the rear cover noise reduction mechanism are separately provided.

[0008] Furthermore, the base bottom noise reduction mechanism includes a first base bottom foam aluminum plate, a second base bottom foam aluminum plate, a third base bottom foam aluminum plate and a fourth base bottom foam aluminum plate arranged on the base bottom.

[0009] Furthermore, the base stator junction box surface noise reduction mechanism includes a first base stator junction box surface foam aluminum plate arranged on one side of the stator threading hole, and a second base stator junction box surface foam aluminum plate and a third base stator junction box surface foam aluminum plate arranged on the other side of the stator threading hole.

[0010] Furthermore, the base heater surface noise reduction mechanism includes a first base heater surface foam aluminum plate and a second base heater surface foam aluminum plate.

[0011] Further, the front end cover noise reduction mechanism includes a first front end cover outer ring foam aluminum plate and a second front end cover outer ring foam aluminum plate arranged on the outside of the front end cover surface, and a first front end cover inner ring foam aluminum plate and a second front end cover inner ring foam aluminum plate arranged on the inside of the front end cover surface; the first front end cover outer ring foam aluminum plate and the second front end cover outer ring foam aluminum plate are arranged in the shape of two semicircular rings butted against each other; the first front end cover inner ring foam aluminum plate and the second front end cover inner ring foam aluminum plate are arranged in the shape of two semicircular rings butted against each other;

[0012] The rear end cover noise reduction mechanism includes a first rear end cover outer ring foam aluminum plate and a second rear end cover outer ring foam aluminum plate arranged on the outer side of the rear end cover surface, and a first rear end cover inner ring foam aluminum plate and a second rear end cover inner ring foam aluminum plate arranged on the inner side of the rear end cover surface; the first rear end cover outer ring foam aluminum plate and the second rear end cover outer ring foam aluminum plate are arranged to form two semicircular ring shapes butted against each other; the first rear end cover inner ring foam aluminum plate and the second rear end cover inner ring foam aluminum plate are arranged to form two semicircular ring shapes butted against each other.

[0013] Furthermore, the cooler body noise reduction mechanism includes a cooler top foam aluminum plate arranged on the cooler.

[0014] Furthermore, the cooler air outlet noise reduction mechanism includes a first cooler air outlet foam aluminum plate, a second cooler air outlet foam aluminum plate, a third cooler air outlet foam aluminum plate and a fourth cooler air outlet foam aluminum plate which are sequentially arranged on the side wall of the cooler air outlet along the circumferential direction.

[0015] Furthermore, the noise reduction mechanism on the front and back surfaces of the slip ring chamber includes a first foam aluminum plate and a stainless steel plate composite plate respectively arranged on the front surface and the front and back surfaces of the slip ring chamber; the noise reduction mechanism on the side and top surfaces of the slip ring chamber includes a second foam aluminum plate and a stainless steel plate composite plate respectively arranged on the side and top surfaces of the slip ring chamber.

[0016] In order to achieve the above object, in a second aspect, the present invention further provides a direct-cooled doubly-fed generator noise reduction method taking into account noise characteristics, which adopts the following technical solution:

[0017] A method for reducing noise of a direct-cooled doubly-fed generator taking noise characteristics into consideration uses a direct-cooled doubly-fed generator noise reduction device taking noise characteristics into consideration as described in the first aspect, comprising: suppressing the generation and transmission of aerodynamic noise, mechanical noise, electromagnetic noise and vibration noise through a base bottom surface noise reduction mechanism, a base stator junction box surface noise reduction mechanism, a base heater surface noise reduction mechanism, a front cover noise reduction mechanism, a rear cover noise reduction mechanism, a cooler body noise reduction mechanism, a cooler air outlet noise reduction mechanism, a slip ring chamber front and rear surface noise reduction mechanism, and a slip ring chamber side and top surface noise reduction mechanism.

[0018] In order to achieve the above-mentioned purpose, in a third aspect, the present invention further provides a generator, which adopts the following technical solution:

[0019] A generator uses the direct-cooled double-fed generator noise reduction device considering noise characteristics as described in the first aspect.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention starts from the noise generation mechanism, takes into account the noise characteristics such as aerodynamic noise, mechanical noise, electromagnetic noise and vibration noise, and respectively provides a noise reduction mechanism whose noise reduction material is a foam aluminum plate at each noise source, starting from the noise generation mechanism, taking into account the characteristics such as aerodynamic noise, mechanical noise, electromagnetic noise and vibration noise, and arranges foam aluminum plates on the source components corresponding to the positions where the noise is generated in the generator to reduce the noise, thereby avoiding the problem of easy falling off and aging of the sound-absorbing materials used to reduce the noise of the current direct-cooled double-fed generator, effectively reducing the generation of generator noise, blocking the propagation of generator noise, fundamentally reducing the generator noise, and improving The environmental friendliness of the wind turbine generator set is improved; at the same time, the noise reduction mechanisms at the front and rear of the slip ring chamber and the noise reduction mechanisms at the sides and top of the slip ring chamber respectively adopt the first foam aluminum plate and the stainless steel plate composite plate and the second foam aluminum plate and the stainless steel plate composite plate as noise reduction materials, which not only gives full play to the sound absorption ability of the foam aluminum plate, but also gives full play to the sound insulation ability of the stainless steel plate, and also avoids the accumulation of carbon powder. Other noise reduction mechanisms use foam aluminum plates as noise reduction materials, which have excellent flame retardant properties and ensure the safety of the generator. In the noise reduction mechanism of the cooler main body, the foam aluminum plate opening at the cooler outlet is set to ensure the sound absorption performance without affecting the ventilation volume requirements. The foam aluminum plates in the front cover noise reduction mechanism and the rear cover noise reduction mechanism are set separately to avoid the damage of the shaft current to the bearing, which takes into account the overall operation of the generator and the purpose of improving the noise reduction performance.

[0022] 2. The present invention selects foam aluminum plates, which are light in weight and can realize lightweight design of the generator. It has excellent flame retardant properties and ensures the safety of the generator. Closed foam aluminum plates are used inside the base, on the top of the cooler body, and inside the end cover to achieve excellent sound insulation performance. The slip ring chamber adopts a foam aluminum plate + stainless steel plate structure, which not only gives full play to the sound absorption ability of the foam aluminum plate, but also gives full play to the sound insulation ability of the stainless steel plate, and avoids the accumulation of carbon powder. An open foam aluminum plate is used at the air outlet of the cooler, which can not only achieve sound absorption performance but also ensure ventilation volume requirements. The foam aluminum plates at the front cover and the rear cover adopt a split design to avoid damage to the bearings caused by shaft current.

[0023] 3. The present invention adopts foam aluminum plate, which has the advantages of high strength, high and low temperature resistance, flame retardancy and fire resistance, and fearlessness of moisture. It will not deform during use; the foam aluminum plate has good electromagnetic shielding effect and can avoid electromagnetic shielding of the cabin control cable; the foam aluminum plate has a long service life of 50 to 70 years, which can meet the full life cycle of the generator, and will not generate pollution during use, and can achieve 100% recycling and reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0025] Figure 1 The base bottom surface noise reduction mechanism of embodiment 1 of the present invention;

[0026] Figure 2 The surface noise reduction mechanism of the base stator junction box of embodiment 1 of the present invention;

[0027] Figure 3 The base heater surface noise reduction mechanism of embodiment 1 of the present invention;

[0028] Figure 4 The front end cover noise reduction mechanism of embodiment 1 of the present invention;

[0029] Figure 5 The rear end cover noise reduction mechanism of embodiment 1 of the present invention;

[0030] Figure 6 The cooler main body noise reduction mechanism of embodiment 1 of the present invention;

[0031] Figure 7 The cooler air outlet noise reduction mechanism of embodiment 1 of the present invention;

[0032] Figure 8 The front and rear noise reduction mechanism of the slip ring chamber of embodiment 1 of the present invention;

[0033] Fig. 9 The side and top surface noise reduction mechanism of the slip ring chamber of embodiment 1 of the present invention;

[0034] Among them, 1. Base bottom surface noise reduction mechanism; 11. First base bottom surface foam aluminum plate; 12. Second base bottom surface foam aluminum plate; 13. Third base bottom surface foam aluminum plate; 14. Fourth base bottom surface foam aluminum plate; 2. Base stator junction box surface noise reduction mechanism; 21. First base stator junction box surface foam aluminum plate; 22. Stator threading hole; 23. Second base stator junction box surface foam aluminum plate; 24. Third base stator junction box surface foam aluminum plate; 3. Base heater surface noise reduction mechanism; 31. First heater; 32. First base heater surface foam aluminum plate; 33. Second base heater surface foam aluminum plate; 34. Second heater; 4. Front end cover noise reduction mechanism; 41. First rotating shaft; 42. First front end cover outer ring foam aluminum plate; 43. Second front end cover outer ring foam aluminum plate; 44. First front end cover inner ring foam aluminum plate Foam aluminum plate; 45, second front end cover inner ring foam aluminum plate; 5, rear end cover noise reduction mechanism; 51, second rotating shaft, 52, first rear end cover outer ring foam aluminum plate; 53, second rear end cover outer ring foam aluminum plate; 54, first rear end cover inner ring foam aluminum plate; 55, second rear end cover inner ring foam aluminum plate; 6, cooler body noise reduction mechanism; 61, cooler top foam aluminum plate; 7, cooler air outlet noise reduction mechanism; 71, first cooler air outlet foam aluminum plate; 72, second cooler air outlet foam aluminum plate; 73, third cooler air outlet foam aluminum plate; 74, fourth cooler air outlet foam aluminum plate; 8, slip ring chamber front and back noise reduction mechanism; 81, first foam aluminum plate and stainless steel plate composite plate; 82, third rotating shaft; 9, slip ring chamber side and top noise reduction mechanism; 91, second foam aluminum plate and stainless steel plate composite plate. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0037] Embodiment 1:

[0038] As recorded in the background technology, currently, the method of reducing noise of direct-cooled doubly-fed generators is usually to install sound-absorbing cotton on the inside of the generator air outlet to reduce noise; there is a risk of falling off in the later stage of directly pasting the silencer cotton on the generator air outlet, and the silencer cotton is currently fixed by adding a wire mesh, which affects the silencer effect; the noise reduction effect of pasting silencer cotton on the inside of the generator air outlet is limited, and it cannot fundamentally reduce the generator noise problem; due to the high temperature of the generator air outlet, the silencer cotton is aging, and there is a risk of falling off during long-term operation.

[0039] For at least one of the above problems, such as Figures 1 to 9As shown, this embodiment provides a direct-cooled doubly-fed generator noise reduction device that takes into account noise characteristics. Starting from the noise generation mechanism, the noise generated by the generator includes aerodynamic noise, mechanical noise (bearings, slip ring chamber), electromagnetic noise, vibration noise, etc. Considering all angles of noise generation, the noise generation of the generator is effectively reduced, the propagation of the generator noise is blocked, and the environmental friendliness of the wind turbine generator set is improved. The device includes a plurality of noise reduction mechanisms arranged at corresponding positions of the generator; wherein the plurality of noise reduction mechanisms include a base bottom surface noise reduction mechanism 1, a base stator junction box surface noise reduction mechanism 2, a base heater surface noise reduction mechanism 3, a front cover noise reduction mechanism 4, a rear cover noise reduction mechanism 5, a cooler body noise reduction mechanism 6, a cooler outlet noise reduction mechanism 7, a slip ring chamber front and rear surface noise reduction mechanism 8, and a slip ring chamber side and top surface noise reduction mechanism 9;

[0040] Optionally, the noise reduction mechanism 8 on the front and back surfaces of the slip ring chamber and the noise reduction mechanism 9 on the side and top surfaces of the slip ring chamber respectively use a first foam aluminum plate and a stainless steel plate composite plate 81 and a second foam aluminum plate and a stainless steel plate composite plate as noise reduction materials 91, and other noise reduction mechanisms use foam aluminum plates as noise reduction materials; in the cooler main body noise reduction mechanism 6, an opening of the foam aluminum plate at the cooler air outlet is set; the foam aluminum plates in the front cover noise reduction mechanism 4 and the rear cover noise reduction mechanism 5 are set separately.

[0041] Specifically, this embodiment starts from the noise generation mechanism, takes into account the noise characteristics such as aerodynamic noise, mechanical noise, electromagnetic noise and vibration noise, and from the noise sources such as the base bottom, base stator junction box, base heater, front cover, rear cover, cooler body, cooler air outlet, slip ring chamber, etc. that generate and transmit each characteristic noise, a noise reduction mechanism in which the noise reduction material is a foam aluminum plate is provided on each noise source. Starting from the noise generation mechanism, taking into account the characteristics such as aerodynamic noise, mechanical noise, electromagnetic noise and vibration noise, foam aluminum plates are provided on the source components corresponding to the noise generation positions of the generator to reduce the noise, thereby avoiding the problem of easy falling off and aging of sound-absorbing materials used to reduce noise in the current direct-cooled double-fed generator, effectively reducing the generation of generator noise, blocking the propagation of generator noise, fundamentally reducing the generator noise, and improving the environmental friendliness of the wind turbine generator set.

[0042] At the same time, the noise reduction mechanism 8 at the front and back of the slip ring chamber and the noise reduction mechanism 9 at the side and top of the slip ring chamber respectively use a first foam aluminum plate and a stainless steel plate composite plate 81 and a second foam aluminum plate and a stainless steel plate composite plate 91 as noise reduction materials, which not only gives full play to the sound absorption ability of the foam aluminum plate, but also gives full play to the sound insulation ability of the stainless steel plate, and also avoids the accumulation of carbon powder. Other noise reduction mechanisms use foam aluminum plates as noise reduction materials, which have excellent flame retardant properties and ensure the safety of the generator. In the cooler main body noise reduction mechanism 6, the foam aluminum plate opening at the cooler outlet is set to ensure the sound absorption performance without affecting the ventilation volume requirement. The foam aluminum plates in the front cover noise reduction mechanism 4 and the rear cover noise reduction mechanism 5 are separately set to avoid damage to the bearings caused by the shaft current, and take into account the overall operation of the generator and the purpose of improving the noise reduction performance as a whole.

[0043] It can be understood that the doubly-fed wind turbine generator at least includes a stator, a rotor, a base, an end cover, a cooler, a slip ring chamber, a heater, a bearing and the device; the device includes a plurality of foam aluminum plates (flat plates and preformed plates) and fastening bolts.

[0044] like Figure 1 As shown, the base bottom noise reduction mechanism 1 includes a first base bottom foam aluminum plate 11, a second base bottom foam aluminum plate 12, a third base bottom foam aluminum plate 13 and a fourth base bottom foam aluminum plate 14 arranged on the base bottom.

[0045] Specifically, the foam aluminum plate 11 on the bottom surface of the first base, the foam aluminum plate 12 on the bottom surface of the second base, the foam aluminum plate 13 on the bottom surface of the third base, and the foam aluminum plate 14 on the bottom surface of the fourth base are independently arranged, which is convenient for installation and can suppress the generation and transmission of noise.

[0046] like Figure 2 As shown, the base stator junction box surface noise reduction mechanism 2 includes a first base stator junction box surface foam aluminum plate 21 arranged on one side of the stator threading hole 22, and a second base stator junction box surface foam aluminum plate 23 and a third base stator junction box surface foam aluminum plate 24 arranged on the other side of the stator threading hole 22.

[0047] Specifically, the foam aluminum plate 21 on the surface of the first base stator junction box, the foam aluminum plate 23 on the surface of the second base stator junction box and the foam aluminum plate 24 on the surface of the third base stator junction box are independently arranged and avoid the stator threading hole 22. On the basis of meeting the working requirements and facilitating installation, the generation and transmission of noise can be suppressed.

[0048] like Figure 3 As shown, the base heater surface noise reduction mechanism 3 includes a first base heater surface foam aluminum plate 32 and a second base heater surface foam aluminum plate 33 .

[0049] Specifically, the first base heater surface foam aluminum plate 32 and the second base heater surface foam aluminum plate 33 are independently arranged, and the first base heater surface foam aluminum plate 32 and the second base heater surface foam aluminum plate 33 are arranged between the first heater 31 and the second heater 34 on the base heater surface. On the basis of meeting working requirements and convenient installation, they can suppress the generation and transmission of noise.

[0050] like Figure 4 and Figure 5 As shown, the front end cover noise reduction mechanism 4 includes a first front end cover outer ring foam aluminum plate 42 and a second front end cover outer ring foam aluminum plate 43 arranged on the outside of the front end cover surface, and a first front end cover inner ring foam aluminum plate 44 and a second front end cover inner ring foam aluminum plate 45 arranged on the inside of the front end cover surface; the first front end cover outer ring foam aluminum plate 42 and the second front end cover outer ring foam aluminum plate 43 are arranged in the shape of two semicircular rings butted against each other; the first front end cover inner ring foam aluminum plate 44 and the second front end cover inner ring foam aluminum plate 45 are arranged in the shape of two semicircular rings butted against each other, and a first rotating shaft 4 is arranged between the first front end cover inner ring foam aluminum plate 44 and the second front end cover inner ring foam aluminum plate 45. 1; The rear end cover noise reduction mechanism includes a first rear end cover outer ring foam aluminum plate 52 and a second rear end cover outer ring foam aluminum plate 53 arranged on the outer side of the rear end cover surface, and a first rear end cover inner ring foam aluminum plate 54 and a second rear end cover inner ring foam aluminum plate 55 arranged on the inner side of the rear end cover surface; the first rear end cover outer ring foam aluminum plate 52 and the second rear end cover outer ring foam aluminum plate 53 are arranged in the shape of two semicircular rings butted against each other; the first rear end cover inner ring foam aluminum plate 54 and the second rear end cover inner ring foam aluminum plate 55 are arranged in the shape of two semicircular rings butted against each other, and a second rotating shaft 51 is arranged between the first rear end cover inner ring foam aluminum plate 54 and the second rear end cover inner ring foam aluminum plate 55. The foam aluminum plates at the front end cover and the rear end cover are designed in a split type, which can avoid damage to the bearing caused by shaft current.

[0051] like Figure 6 As shown, the cooler main body noise reduction mechanism 6 includes a cooler top foam aluminum plate 61 arranged on the cooler. Figure 7 As shown, the cooler air outlet noise reduction mechanism 7 includes a first cooler air outlet foam aluminum plate 71, a second cooler air outlet foam aluminum plate 72, a third cooler air outlet foam aluminum plate 73 and a fourth cooler air outlet foam aluminum plate 74 which are sequentially arranged on the side wall of the cooler air outlet along the circumferential direction; an open foam aluminum plate is used at the cooler air outlet, which can not only achieve sound absorption performance but also ensure ventilation volume requirements.

[0052] like Figure 8 and Fig. 9As shown, the front and rear noise reduction mechanism 8 of the slip ring chamber includes a first foam aluminum plate and a stainless steel plate composite plate 81 respectively arranged on the front surface and the front and rear surfaces of the slip ring chamber; a through hole is opened on the first foam aluminum plate and the stainless steel plate composite plate 81 at the third rotating shaft 82 on the front and rear surfaces of the slip ring chamber. The side and top noise reduction mechanism 9 of the slip ring chamber includes a second foam aluminum plate and a stainless steel plate composite plate 91 respectively arranged on the side and top surfaces of the slip ring chamber; the foam aluminum plates at the front cover and the rear cover are designed in a split type to avoid damage to the bearings caused by shaft current.

[0053] The generator in this embodiment may be the generator in Embodiment 3, which will not be described in detail here.

[0054] Embodiment 2:

[0055] The present embodiment provides a direct-cooled doubly-fed generator noise reduction method considering noise characteristics, using the direct-cooled doubly-fed generator noise reduction device considering noise characteristics as described in Example 1, including: suppressing the generation and transmission of aerodynamic noise, mechanical noise, electromagnetic noise and vibration noise through a base bottom surface noise reduction mechanism 1, a base stator junction box surface noise reduction mechanism 2, a base heater surface noise reduction mechanism 3, a front cover noise reduction mechanism 4, a rear cover noise reduction mechanism 5, a cooler body noise reduction mechanism 6, a cooler air outlet noise reduction mechanism 7, a slip ring chamber front and rear surface noise reduction mechanism 8 and a slip ring chamber side and top surface noise reduction mechanism 9.

[0056] The electromagnetic noise generated during the operation of the generator is mainly caused by the electromagnetic force in the air gap magnetic field acting on the iron core, which causes the motor vibration radiation noise. The electromagnetic noise can be effectively reduced by reasonably designing the air gap between the stator and rotor during the design of the generator. Mechanical noise is mainly caused by factors such as bearing friction, rotor unbalance vibration, and carbon brush friction. Mechanical noise can be effectively reduced by controlling the bearing processing accuracy, rotor dynamic balance, and carbon brush pre-grinding.

[0057] Embodiment 3:

[0058] This embodiment provides a generator, using the direct-cooled double-fed generator noise reduction device taking into account the noise characteristics as described in Embodiment 1.

[0059] Specifically, the generator is a doubly-fed wind generator, which at least includes a stator, a rotor, a base, an end cover, a cooler, a slip ring chamber, a heater, a bearing and the device; the device includes a plurality of foam aluminum plates (flat plates and preformed plates) and fastening bolts.

[0060] The inside of the base and the space between the stator are hollow, and a foam aluminum plate can be installed. The inner surface of the base is distributed with threaded mounting holes. The base has three faces, and the bottom face has five reinforcement structures. There is a plane between the reinforcement structures. A total of four foam aluminum plates are installed on this face, and the mounting threaded holes on the plane correspond to the mounting holes of the foam aluminum plates. The base has three faces, and the stator junction box face has five reinforcement structures. There is a plane between the reinforcement structures. There are wire entry holes on the back of the stator junction box, and foam aluminum plates cannot be installed. A total of three foam aluminum plates are installed on this face, and the mounting threaded holes on the plane correspond to the mounting holes of the foam aluminum plates. The base has three faces, and the heater face has five reinforcement structures. There is a plane between the reinforcement structures, and two observation holes and two heaters are arranged. A total of two foam aluminum plates are installed on this face, and the mounting threaded holes on the plane correspond to the mounting holes of the foam aluminum plates.

[0061] The end cover is a circular structure, and a foam aluminum plate can be installed. The inner surface of the end cover is distributed with threaded mounting holes. The end cover is a circular structure, and the end cover is an insulating end cover. The middle and the outside are insulating structures, and they are not allowed to be connected as a whole. For the convenience of installation, the circle is divided into two parts, the upper and lower parts. A total of four foam aluminum plates are installed on the front cover, and the mounting threaded holes on the end cover correspond to the mounting holes of the foam aluminum plates. The rear end cover is a circular structure, and the end cover is an insulating end cover. The middle and the outside are insulating structures, and they are not allowed to be connected as a whole. For the convenience of installation, the circle is divided into two parts, the upper and lower parts. A total of four foam aluminum plates are installed on the front cover, and the mounting threaded holes on the end cover correspond to the mounting holes of the foam aluminum plates.

[0062] The main body of the cooler is a square structure, and the air outlet is a circular structure. A threaded mounting seat is welded on the inner surface of the cooler. The main body of the cooler is a square structure, and the bottom is a hollow structure, which is installed above the base. The top surface is a full plane, and the front, left, and right sides are air inlet structures, with a total of eight filter cottons installed, and the back is the air outlet. A foam aluminum plate is installed on the top surface of the cooler main body, and the mounting seat on the cooler main body corresponds to the mounting hole of the foam aluminum plate. The air outlet of the cooler is a circular structure. For ease of installation, it is evenly divided into four parts. A total of four foam aluminum plates are installed on the cooler air outlet, and the mounting seat on the inner surface of the cooler air outlet corresponds to the foam aluminum plate according to the hole.

[0063] The slip ring chamber is a square structure, which can be installed with foam aluminum plates. The inner surface of the slip ring chamber is welded with a threaded mounting seat. The slip ring chamber is a square structure. In order to achieve silence and avoid carbon powder accumulation, a foam aluminum plate + stainless steel plate structure is used. The foam aluminum plate + stainless steel plate structure in front of the slip ring chamber avoids the grounding carbon brush. A total of five foam aluminum plates + stainless steel plate structures are installed in the slip ring chamber. The mounting seat on the slip ring chamber corresponds to the mounting hole of the foam aluminum plate.

[0064] Specifically, the rotor is fixed in the front cover and the rear cover by bearings at both ends. The rotor is located in a cavity formed by the base, the end cover and the cooler.

[0065] The foam aluminum plate 11 on the bottom surface of the first base, the foam aluminum plate 12 on the bottom surface of the second base, the foam aluminum plate 13 on the bottom surface of the third base, and the foam aluminum plate 14 on the bottom surface of the fourth base are respectively installed in the middle of the five reinforcement structures on the bottom surface of the base. The foam aluminum plate 21 on the stator junction box surface of the first base, the foam aluminum plate 23 on the stator junction box surface of the second base, and the foam aluminum plate 24 on the stator junction box surface of the third base are respectively installed between the reinforcement structures on the stator junction box surface of the base, and one of the surfaces is the stator threading hole 22 without a foam aluminum plate. The foam aluminum plate 32 on the heater surface of the first base and the foam aluminum plate 33 on the heater surface of the second base are respectively installed between the reinforcement structures on the heater surface of the base; the first heater 31 and the second heater 34 are arranged therein, and the two surfaces of the first heater 31 and the second heater 34 corresponding to the observation holes are not provided with a foam aluminum plate. The foam aluminum plate 42 on the outer ring of the first front end cover, the foam aluminum plate 43 on the outer ring of the second front end cover, the foam aluminum plate 44 on the inner ring of the first front end cover, and the foam aluminum plate 45 on the inner ring of the second front end cover are respectively installed on the front end cover. The first rear end cover outer ring foam aluminum plate 52, the second rear end cover outer ring foam aluminum plate 53, the first rear end cover inner ring foam aluminum plate 54 and the second rear end cover inner ring foam aluminum plate 55 are respectively installed on the rear end cover. The above measures can effectively reduce the aerodynamic noise, mechanical noise (bearing) and electromagnetic noise generated by the rotation of the rotor from being transmitted to the outside of the base.

[0066] The foam aluminum plate 61 at the top of the cooler is installed on the top surface of the cooler. The first cooler air outlet foam aluminum plate 71, the second cooler air outlet foam aluminum plate 72, the third cooler air outlet foam aluminum plate 73 and the fourth cooler air outlet foam aluminum plate 74 can be set as special-shaped foam aluminum plates, which are respectively installed at the cooler air outlets; the above measures can effectively reduce the internal noise of the generator from being transmitted to the outside of the cooler.

[0067] The first foam aluminum plate and stainless steel plate composite plate 81 is installed on the front and back of the slip ring chamber, and the second foam aluminum plate and stainless steel plate composite plate 91 is installed on the side and top of the slip ring chamber, which can effectively reduce the noise generated by the wear of the carbon brush in the slip ring chamber from being transmitted to the outside of the slip ring chamber.

[0068] The working principle or process of this embodiment is as follows:

[0069] The aerodynamic noise, mechanical noise, electromagnetic noise and vibration noise generated during the operation of the generator will be intercepted and absorbed by the foam aluminum plate installed on the bottom surface of the base, the foam aluminum plate on the surface of the base stator junction box, and the foam aluminum plate on the surface of the base heater in the generator body, reducing the transmission of the generator noise from the base. Similarly, the foam aluminum plate on the front cover and the foam aluminum plate on the rear cover also play a role in intercepting and absorbing noise, reducing the transmission of the generator noise from the front and rear covers.

[0070] The foam aluminum plate arranged on the generator cooler body can intercept and absorb the noise above the generator base. The special-shaped foam aluminum plate arranged on the cooler air outlet can effectively reduce the noise at the generator cooler air outlet.

[0071] The first foam aluminum plate and stainless steel plate composite plate 81 on the front and rear end surfaces of the generator slip ring chamber, and the second foam aluminum plate and stainless steel plate composite plate 91 on the side and top surfaces of the slip ring chamber can reduce the noise generated by the friction between the slip ring and the carbon brush in the slip ring chamber.

[0072] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A direct-cooled double-fed generator noise reduction device considering noise characteristics, characterized in that: It includes a plurality of noise reduction mechanisms arranged at corresponding positions of the generator; wherein the plurality of noise reduction mechanisms include a base bottom surface noise reduction mechanism, a base stator junction box surface noise reduction mechanism, a base heater surface noise reduction mechanism, a front end cover noise reduction mechanism, a rear end cover noise reduction mechanism, a cooler body noise reduction mechanism, a cooler air outlet noise reduction mechanism, a slip ring chamber front and rear surface noise reduction mechanism, and a slip ring chamber side and top surface noise reduction mechanism; The noise reduction mechanisms at the front and rear surfaces of the slip ring chamber and the noise reduction mechanisms at the side and top surfaces of the slip ring chamber respectively use a first foam aluminum plate and a stainless steel plate composite plate and a second foam aluminum plate and a stainless steel plate composite plate as noise reduction materials, and other noise reduction mechanisms use foam aluminum plates as noise reduction materials; in the noise reduction mechanism of the cooler main body, an opening of the foam aluminum plate at the air outlet of the cooler is provided; the foam aluminum plates in the front cover noise reduction mechanism and the rear cover noise reduction mechanism are separately provided.

2. The direct-cooled double-fed generator noise reduction device considering noise characteristics as claimed in claim 1, characterized in that: The base bottom surface noise reduction mechanism comprises a first base bottom surface foam aluminum plate, a second base bottom surface foam aluminum plate, a third base bottom surface foam aluminum plate and a fourth base bottom surface foam aluminum plate which are arranged on the base bottom surface.

3. The direct-cooled double-fed generator noise reduction device considering noise characteristics as claimed in claim 1, characterized in that: The base stator junction box surface noise reduction mechanism includes a first base stator junction box surface foam aluminum plate arranged on one side of the stator threading hole, and a second base stator junction box surface foam aluminum plate and a third base stator junction box surface foam aluminum plate arranged on the other side of the stator threading hole.

4. The direct-cooled double-fed generator noise reduction device considering noise characteristics as claimed in claim 1, characterized in that: The pedestal heater surface noise reduction mechanism comprises a first pedestal heater surface foam aluminum plate and a second pedestal heater surface foam aluminum plate.

5. The direct-cooled double-fed generator noise reduction device considering noise characteristics as claimed in claim 1, characterized in that: The front end cover noise reduction mechanism comprises a first front end cover outer circle foam aluminum plate and a second front end cover outer circle foam aluminum plate arranged on the outside of the front end cover surface, and a first front end cover inner circle foam aluminum plate and a second front end cover inner circle foam aluminum plate arranged on the inside of the front end cover surface; the first front end cover outer circle foam aluminum plate and the second front end cover outer circle foam aluminum plate are arranged in the shape of two semicircular rings butted against each other; the first front end cover inner circle foam aluminum plate and the second front end cover inner circle foam aluminum plate are arranged in the shape of two semicircular rings butted against each other; The rear end cover noise reduction mechanism includes a first rear end cover outer ring foam aluminum plate and a second rear end cover outer ring foam aluminum plate arranged on the outer side of the rear end cover surface, and a first rear end cover inner ring foam aluminum plate and a second rear end cover inner ring foam aluminum plate arranged on the inner side of the rear end cover surface; the first rear end cover outer ring foam aluminum plate and the second rear end cover outer ring foam aluminum plate are arranged to form two semicircular ring shapes butted against each other; the first rear end cover inner ring foam aluminum plate and the second rear end cover inner ring foam aluminum plate are arranged to form two semicircular ring shapes butted against each other.

6. The direct-cooled double-fed generator noise reduction device considering noise characteristics as claimed in claim 1, characterized in that: The cooler main body noise reduction mechanism comprises a cooler top foam aluminum plate arranged on the cooler.

7. The direct-cooled double-fed generator noise reduction device considering noise characteristics as claimed in claim 1, characterized in that: The cooler air outlet noise reduction mechanism comprises a first cooler air outlet foam aluminum plate, a second cooler air outlet foam aluminum plate, a third cooler air outlet foam aluminum plate and a fourth cooler air outlet foam aluminum plate which are sequentially arranged on the cooler air outlet side wall along the circumferential direction.

8. The direct-cooled double-fed generator noise reduction device considering noise characteristics as claimed in claim 1, characterized in that: The front and rear noise reduction mechanisms of the slip ring chamber include a first foam aluminum plate and a stainless steel plate composite plate respectively arranged on the front surface and the front and rear surfaces of the slip ring chamber; the side and top noise reduction mechanisms of the slip ring chamber include a second foam aluminum plate and a stainless steel plate composite plate respectively arranged on the side and top surfaces of the slip ring chamber.

9. A method for reducing noise of a direct-cooled doubly-fed generator considering noise characteristics, characterized in that: A direct-cooled doubly-fed generator noise reduction device taking noise characteristics into consideration as described in any one of claims 1 to 8 is used, comprising: suppressing the generation and transmission of aerodynamic noise, mechanical noise, electromagnetic noise and vibration noise through a base bottom surface noise reduction mechanism, a base stator junction box surface noise reduction mechanism, a base heater surface noise reduction mechanism, a front cover noise reduction mechanism, a rear cover noise reduction mechanism, a cooler body noise reduction mechanism, a cooler air outlet noise reduction mechanism, a slip ring chamber front and rear surface noise reduction mechanism, and a slip ring chamber side and top surface noise reduction mechanism.

10. A generator, characterized in that A direct-cooled doubly-fed generator noise reduction device taking noise characteristics into consideration as described in any one of claims 1 to 8 is used.

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