Drying device for the windings of a generator rotor

Abstract

This application relates to a generator rotor winding drying device, comprising a drying assembly and an air supply assembly. The drying assembly includes a drying housing with a first end, a second end, a cavity, an air inlet, and an air outlet. The first end and the second end are positioned opposite each other, with the air inlet located closer to the first end and the air outlet closer to the second end. Both the air inlet and the air outlet communicate with the cavity, which houses the generator rotor located between the slip ring and the end retaining ring. A first mounting sleeve is provided at the first end, and a second mounting sleeve is provided at the second end. Both the first and second mounting sleeves are used to fit around the outer circumference of the generator rotor shaft. The air supply assembly is located outside the drying housing and has an air supply end that communicates with the cavity through the air inlet. The air supply assembly supplies high-temperature and dry gas to the cavity. This generator rotor winding drying device can quickly dry the windings and has good safety performance.

Description

Technical Field

[0001] This application relates to the field of generator technology, and in particular to a winding drying device for a generator rotor. Background Technology

[0002] During generator maintenance or installation, the rotor needs to be inspected or accepted. Rotors are generally quite heavy, and typically need to be temporarily stored in the power plant for inspection or acceptance. Because the inspection or acceptance process is lengthy, and during rainy seasons or the plum rain season when humidity is high, the rotor windings are easily exposed to moisture and become damp, especially for rotors temporarily stored in power plants built in coastal areas, where the windings are more susceptible to moisture damage.

[0003] Moisture-damaged windings have lower insulation performance, which affects a series of insulation tests on the rotor. In severe cases, it can even affect the rotor's reinstallation in the stator cavity, delaying the entire overhaul completion period or installation schedule. Therefore, the rotor must be dried when it is damp.

[0004] Conventional methods for drying rotors include heat source drying and current heating. Heat source drying uses a sun lamp or hot air blower to heat a specific part of the rotor. Due to the large size of the rotor and the small heat source, this method results in a small drying area, slow drying speed, and low efficiency. Current heating uses a large current power supply to pass a direct current through the rotor. The heat generated by the direct current heats the rotor windings, thus drying them. This method has a wide drying area and good drying effect, but the current is difficult to control. A large current can damage the insulation of the windings, leading to rotor damage. Therefore, this drying method has poor safety performance. Utility Model Content

[0005] Therefore, it is necessary to provide a generator rotor winding drying device that can quickly dry the windings and has good safety performance to address the above problems.

[0006] A winding drying device for a generator rotor is provided. The generator rotor includes a shaft, slip rings, and end retaining rings. The slip rings and end retaining rings are both disposed on the shaft and are spaced apart along the axial direction of the shaft. One end of the shaft protrudes from the side of the slip ring facing away from the end retaining ring, and the other end protrudes from the side of the end retaining ring facing away from the slip ring. The device includes:

[0007] A drying assembly includes a drying housing having a first end, a second end, a cavity, an air inlet, and an air outlet. The first end and the second end are positioned opposite each other. The air inlet is positioned near the first end, and the air outlet is positioned near the second end. Both the air inlet and the air outlet communicate with the cavity. The cavity is used to accommodate the portion of the generator rotor located between the slip ring and the end retaining ring. A first mounting sleeve is provided at the first end, and a second mounting sleeve is provided at the second end. Both the first and second mounting sleeves are used to fit around the outer periphery of the generator rotor shaft.

[0008] An air supply assembly is disposed outside the drying housing and has an air supply end. The air supply end is connected to the cavity through the air inlet. The air supply assembly is used to supply high-temperature and dry gas to the cavity.

[0009] In one embodiment, the drying housing includes a first housing and a second housing that can be docked to each other, with a cavity formed between the first housing and the second housing. A first set of separate parts and a second set of separate parts are respectively provided at both ends of the length direction of the first housing, and a third set of separate parts and a fourth set of separate parts are respectively provided at both ends of the length direction of the second housing. When the first housing and the second housing are docked, the first set of separate parts abuts against the third set of separate parts to form the first mounting sleeve, and the second set of separate parts abuts against the fourth set of separate parts to form the second mounting sleeve. At least one of the first housing and the second housing is provided with the air inlet and / or the air outlet.

[0010] In one embodiment, the drying housing further includes a locking element for use between the first housing and the second housing.

[0011] In one embodiment, a support assembly for supporting the drying housing is also included, the support assembly being disposed on the first housing or the second housing.

[0012] In one embodiment, a first sealing gasket is provided on the side of the first mounting sleeve that is sleeved with the generator rotor;

[0013] And / or, a second sealing gasket is provided on the side of the second mounting sleeve that is fitted with the generator rotor.

[0014] In one embodiment, the drying housing is further provided with a retaining ring, which is located in the cavity and close to the second mounting sleeve. The retaining ring is used to abut against the outer periphery of the end guard ring of the generator rotor.

[0015] In one embodiment, the drying housing is further provided with a plurality of connecting ribs, one end of which is connected to the outer peripheral side of the abutment ring and the other end is connected to the inner sidewall of the cavity. The plurality of connecting ribs are distributed at intervals around the axis of the abutment ring, and a second ventilation hole is formed between two adjacent connecting ribs.

[0016] In one embodiment, the air supply assembly includes a first fan, a dehumidifier, and a heater connected in sequence. The first fan is used to deliver external air to the dehumidifier and the heater in sequence, and deliver it to the cavity through the air supply end. The dehumidifier is used to condense and cool the air to remove moisture from the air. The air outlet of the heater is connected to the air supply end, and the heater is used to heat the air to obtain high-temperature and dry gas.

[0017] In one embodiment, the air supply assembly further includes a first filter and a second filter, wherein the filter particle size of the first filter is larger than that of the second filter, the first filter is disposed on the air inlet side of the first fan, and the second filter is disposed on the air outlet side of the first fan and located between the first fan and the dehumidifier.

[0018] In one embodiment, the drying device further includes an exhaust pipe, and the air supply assembly further includes an air supply box and a second fan. The first fan, the dehumidifier, the heater, the first filter, the second filter, and the second fan are all disposed inside the air supply box. The air supply box has a first side and a second side disposed opposite to each other. The first side is provided with an air supply end and a first air inlet end, which communicates with the first filter. The second side is provided with a second air inlet end and an air outlet end. One end of the exhaust pipe is connected to the drying housing and communicates with the cavity through the exhaust port. The other end of the exhaust pipe is connected to the second air inlet end, and the second fan is connected between the second air inlet end and the air outlet end.

[0019] The aforementioned generator rotor winding drying device differs from existing heat source drying and current heating methods. Instead, it uses a gas supply assembly to introduce high-temperature, dry gas into the drying housing to dry the portion of the generator rotor located between the slip ring and the end retaining ring. This removes moisture from the generator rotor windings, preventing high current from damaging the winding insulation and avoiding the risk of damage to the generator rotor during the drying process. It offers high safety, and the high-temperature, dry gas in cavity a can quickly remove moisture from the windings, achieving rapid drying and effectively improving the drying efficiency of the windings. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the generator rotor in some embodiments of this application.

[0021] Figure 2 This is a schematic diagram of the structure of the generator rotor winding drying device in some embodiments of this application during the drying process of the generator rotor.

[0022] Figure 3 This is a structural diagram of the excitation end housing in some embodiments of this application.

[0023] Figure 4 This is a structural diagram of the terminal housing in some embodiments of this application.

[0024] Figure 5 The diagram shows the structure of the intermediate shroud in some embodiments of this application.

[0025] In the picture:

[0026] 100. Generator rotor; 1001. Slip ring; 1002. Exciter end retaining ring; 1003. Exciter end small shaft; 1004. Exciter end retaining ring large shaft; 1005. Generator end retaining ring; 1006. Generator end small shaft; 1007. Generator end retaining ring large shaft; 1008. Support frame; 1009. Rotor core; 200. Exciter end housing; 300. Generator end housing; 400. Intermediate fan cover;

[0027] 1. Drying shell; 101. First section; 102. Second section; 103. Third section; 104. Fourth section; 105. Fifth section; 106. Sixth section; 107. Second mounting sleeve; 1071. Second set of separate parts; 1072. Fourth set of separate parts; 108. First mounting sleeve; 1081. First set of separate parts; 1082. Third set of separate parts; 109. Connecting rib; 110. Anchoring ring; 111. Reinforcing rib; 1a. Cavity; 1b. First ventilation hole; 1c. Second ventilation hole; 2. Bracket; 3. 4. First fan; 5. Second fan; 6. First filter; 7. Second filter; 8. First locking element; 9. First latching part; 10. Second latching part; 11. Second locking element; 12. Air supply box; 13. First air inlet; 14. Second air inlet; 15. Air outlet; 16. Air inlet pipe; 17. Exhaust pipe; 18. Air inlet; 19. Exhaust outlet; 10. Dehumidifier; 10. Heater; 11. Controller; 12. Air pressure detector; 13. Humidity detector; 14. Temperature detector. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] See Figure 1 , Figure 1 A schematic diagram of a generator rotor according to an embodiment of this application is shown. The generator rotor provided in this embodiment is a horizontally mounted salient-pole rotor. The generator rotor 100 includes a rotor core 1009, a shaft, windings, slip rings 1001, excitation end retaining ring 1002, and generator end retaining ring 1005. The shaft passes through the rotor core 1009. The slip rings 1001, excitation end retaining ring 1002, and generator end retaining ring 1005 are all disposed on the shaft, with the excitation end retaining ring 1002 and generator end retaining ring 1005 located on opposite axial sides of the rotor core 1009. The slip rings 1001 are spaced apart on the side of the excitation end retaining ring 1002 facing away from the generator end retaining ring 1005. One end of the shaft passes sequentially through the excitation end retaining ring 1002 and the collector ring 1001, and protrudes from the side of the collector ring 1001 away from the generator end retaining ring 1005. The other end of the shaft passes through the generator end retaining ring 1005, and protrudes from the side of the generator end retaining ring 1005 away from the collector ring 1001. The portion of the shaft located between the excitation end retaining ring 1002 and the collector ring 1001 forms the excitation end retaining ring large shaft 1004. The portion of the shaft protruding from the collector ring 1001 away from the generator end retaining ring 1005 forms the excitation end small shaft 1003. The portion of the shaft protruding from the generator end retaining ring 1005 sequentially forms the generator end small shaft 1006, which connects to the generator end retaining ring large shaft 1007, with the generator end retaining ring large shaft 1007 located between the generator end small shaft 1006 and the generator end retaining ring 1005. The slip ring 1001, the excitation end retaining ring shaft 1004, the excitation end retaining ring 1002, the rotor core 1009, and the end retaining ring 1005 are all equipped with windings.

[0035] To facilitate storage of the generator rotor 100, the generator rotor 100 also includes a support frame 1008. There are two support frames 1008; one support frame 1008 is connected to the excitation end shaft 1003 and located on the side of the slip ring 1001 facing away from the excitation end retaining ring 1002, and the other support frame 1008 is connected to the generator end shaft 1006. The generator rotor 100 is placed outside the stator bore by the two support frames 1008 and is supported at a certain height.

[0036] It is understandable that the generator rotor 100 is prone to moisture in a humid environment, which can lead to a decrease in the insulation performance of the windings and thus affect the normal use of the generator rotor 100. Therefore, it is necessary to dry the windings on the generator rotor 100.

[0037] For this, please refer to Figures 2 to 4 Some embodiments provide a winding drying device for a generator rotor (hereinafter referred to as a winding drying device), including a drying assembly and an air supply assembly. The drying assembly includes a drying housing 1, which has a first end, a second end, a cavity 1a, an air inlet 12, and an air outlet 13. The first end and the second end are arranged opposite to each other, the air inlet 12 is located near the first end, and the air outlet 13 is located near the second end. Both the air inlet 12 and the air outlet 13 are connected to the cavity 1a. Figure 1 The cavity 1a is used to house the generator rotor located between the slip ring 1001 and the end retaining ring 1005. Both the first mounting sleeve 108 and the second mounting sleeve 107 are used to fit onto the outer periphery of the generator rotor 100's shaft. In this example, the first mounting sleeve 108 is used to fit onto the outer periphery of the excitation end small shaft 1003 of the generator rotor 100; specifically, the first mounting sleeve 108 is located on the side of the slip ring 1001 facing away from the excitation end retaining ring 1002. The second mounting sleeve 107 is used to fit onto the outer periphery of the end retaining ring large shaft 1007 of the generator rotor 100. The air supply assembly is disposed outside the drying housing 1 and has an air supply end 901. The air supply end 901 communicates with the cavity 1a through the air inlet 12. The air supply assembly is used to supply high-temperature and dry gas to the cavity 1a.

[0038] It should be noted that "high-temperature and dry gas" in this instruction manual refers to dry gas at a temperature higher than normal, that is, dry gas at a temperature greater than 25°C.

[0039] When drying the windings on the generator rotor 100, the portion of the generator rotor 100 located between the slip ring 1001 and the end retaining ring 1005 is housed within the cavity 1a of the drying housing 1. The first mounting sleeve 108 and the second mounting sleeve 107 on the drying housing 1 are respectively fitted onto the outer periphery of the excitation end small shaft 1003 and the outer periphery of the end retaining ring large shaft 1007. When high-temperature and dry gas is introduced into the cavity 1a, the connection between the first mounting sleeve 108 and the excitation end small shaft 1003, and the connection between the second mounting sleeve 107 and the end retaining ring large shaft 1007, prevents gas leakage from the portion between the drying housing 1 and the rotor shaft, thus enabling the gas to dry the windings inside the cavity 1a. An air supply assembly is installed outside the drying housing 1. This assembly supplies high-temperature, dry gas through the air inlet 12 into the cavity 1a. When this high-temperature, dry gas comes into contact with the portion of the generator rotor 100 located between the slip ring 1001 and the end retaining ring 1005 within the cavity 1a, it removes moisture from the windings, achieving hot air drying of the windings. Unlike existing heat source drying and current heating methods, this drying device, by supplying high-temperature, dry gas into the drying housing 1 through the air supply assembly, performs hot air drying on the portion of the generator rotor 100 located between the slip ring 1001 and the end retaining ring 1005, thereby removing moisture from the windings of the generator rotor 100. This prevents high current from damaging the insulation performance of the windings and avoids the risk of damage to the generator rotor 100 during the drying process, offering higher safety. Furthermore, the high-temperature, dry gas in the cavity 1a can quickly remove moisture from the windings, achieving rapid drying and effectively improving the drying efficiency of the windings.

[0040] In one example, the winding drying device also includes an air inlet pipe 10. One end of the air inlet pipe 10 is connected to the drying housing 1 and communicates with the cavity 1a through the air inlet 12. The other end of the air inlet pipe 10 is connected to the air supply end 901 of the air supply component, so that the air supply end 901 of the air supply component can communicate with the cavity 1a of the drying housing 1 through the air inlet pipe 10, so that the air supply component can deliver gas to the drying housing 1.

[0041] It should be noted that the air supply end 901 of the air supply component is not limited to being connected to the cavity 1a of the drying housing 1 via the air inlet pipe 10. In actual implementation, the air supply end 901 of the air supply component can also be connected to the cavity 1a of the drying housing 1 via other structural components, such as a valve body or a compressor. Alternatively, the air supply end 901 of the air supply component can be directly connected to the drying housing 1. The specific structure by which the air supply end 901 of the air supply component connects to the cavity 1a of the drying housing 1 is not limited here.

[0042] In some embodiments, see Figures 2 to 5 The drying housing 1 includes a first housing and a second housing that can be mated together, with a cavity 1a formed between the first housing and the second housing. A first set of separate parts 1081 and a second set of separate parts 1071 are respectively provided at both ends of the length direction of the first housing, and a third set of separate parts 1082 and a fourth set of separate parts 1072 are respectively provided at both ends of the length direction of the second housing. When the first housing and the second housing are mated, the first set of separate parts 1081 abuts against the third set of separate parts 1082 to form a first mounting sleeve 108, and the second set of separate parts 1071 abuts against the fourth set of separate parts 1072 to form a second mounting sleeve 107. At least one of the first housing and the second housing is provided with an air inlet 12. The length directions of both the first housing and the second housing are parallel to the direction from the first end to the second end. The first housing is located below the second housing. In this example, the first housing is provided with an air inlet 12 and an air outlet 13. Of course, in other examples, an air inlet 12 can be provided in the first housing and an air outlet 13 in the second housing, or both the first and second housings can be provided with air inlets 12 and air outlets 13. It is understood that before using the drying device to dry the windings, the generator rotor 100 needs to be installed on the drying device so that the portion of the generator rotor 100 located between the slip ring 1001 and the end retaining ring 1005 is housed within the cavity 1a of the drying housing 1. The drying housing 1 includes a first housing and a second housing that can be mated together. The portion of the generator rotor 100 located between the slip ring 1001 and the end retaining ring 1005 can be placed on one side of the first or second housing, and then the first and second housings can be mated together. The first and second housings are respectively fitted onto the outer periphery of the generator rotor 100, thus facilitating the installation of the generator rotor 100 into the drying device.

[0043] Continue reading Figure 3 and Figure 4 The drying device also includes a support assembly for supporting the drying housing 1, which is disposed on either the first housing or the second housing. When the first housing is disposed below the second housing, the support assembly is disposed on the first housing. In this example, the support assembly includes two supports 2, which are spaced apart from each other in the direction from the first end to the second end. Of course, in other examples, the number of supports 2 can be flexibly adjusted as needed, for example, by setting the number of supports 2 to one, three, or four. In actual implementation, the support assembly can be used to stably place the first housing on a supporting surface (e.g., the ground), facilitating the docking and assembly of the second housing with the first housing.

[0044] The drying housing 1 also includes a locking element, which is used to lock the first housing and the second housing to prevent the first housing and the second housing from being accidentally separated after they are connected.

[0045] In this example, see Figures 2 to 5 The first housing includes a first segment 101, a second segment 102, and a third segment 103 connected sequentially from the first end to the second end. The second housing includes a fourth segment 104, a fifth segment 105, and a sixth segment 106 connected sequentially from the first end to the second end. A first set of components 1081 is disposed at the end of the first segment 101 away from the second segment 102. A second set of components 1071 is disposed at the end of the third segment 103 away from the second segment 102. A third set of components 1082 is disposed at the end of the fourth segment 104 away from the fifth segment 105. A fourth set of components 1072 is disposed at the end of the sixth segment 106 away from the fifth segment 105. When the first housing and the second housing are connected, the first segment 101 connects with the fourth segment 104, forming the excitation end housing 200; the second segment 102 connects with the fifth segment 105, forming the intermediate wind shroud 400; and the third segment 103 connects with the sixth segment 106, forming the turbine end volute. In this example, both the second segment 102 and the fifth segment 105 have a semi-circular arc structure, making the intermediate wind shroud 400 formed by the combination of the second segment 102 and the fifth segment 105 cylindrical.

[0046] In this example, the first segment 101 is provided with an air inlet 12, and the third segment 103 is provided with an air outlet 13.

[0047] Of course, in actual implementation, the specific positions of the air inlet 12 and the air outlet 13 can be flexibly adjusted according to the needs.

[0048] When the support assembly includes two brackets 2, the two brackets 2 are respectively arranged on the first segment 101 and the third segment 103, so that the two ends of the length of the first shell are supported on the support surface by the brackets 2.

[0049] The locking components include a first locking component 7 and a second locking component 8. There are at least two first locking components 7, one of which is used to lock the first segment 101 and the fourth segment 104, and the remaining part of the first locking component 7 is used to connect the third segment 103 and the sixth segment 106. The second locking component 8 is used to connect the second segment 102 and the fifth segment 105.

[0050] Specifically, the first locking member 7 includes a first latching portion 701 and a second latching portion 702 that can engage with the first latching portion 701. For the first locking member 7 used to lock the first segment 101 and the fourth segment 104, one of the first latching portion 701 and the second latching portion 702 is provided on the first segment 101 and the other is provided on the fourth segment 104. In this way, when the first housing and the second housing are mated together, the first latching portion 701 and the second latching portion 702 engage to lock the first segment 101 and the fourth segment 104. When it is necessary to separate the first housing and the second housing, the engagement of the first latching portion 701 and the second latching portion 702 is released. For the first locking member 7 used to lock the third segment 103 and the sixth segment 106, one of the first latching part 701 and the second latching part 702 is provided on the third segment 103 and the other is provided on the sixth segment 106. In this way, when the first housing and the second housing are mated together, the first latching part 701 and the second latching part 702 engage to lock the third segment 103 and the sixth segment 106. When it is necessary to separate the first housing and the second housing, the engagement of the first latching part 701 and the second latching part 702 is released.

[0051] The second locking member 8 includes a first adhesive portion and a second adhesive portion that can cooperate and adhere to the first adhesive portion. One of the first adhesive portion and the second adhesive portion is disposed on the second segment 102, and the other is disposed on the fifth segment 105. When the first housing and the second housing are mated together, the first adhesive portion and the second adhesive portion cooperate and adhere, thereby locking the second segment 102 and the fifth segment 105. When it is necessary to separate the first housing and the second housing, the adhesion between the first adhesive portion and the second adhesive portion is released. This type of second locking member 8 can open or close the intermediate hood 400 by adhesive or tearing.

[0052] It should be noted that the structure of the locking components can be flexibly set according to the actual situation, and no specific restrictions are placed on the structure and quantity of the locking components here.

[0053] To prevent the high-temperature and dry gas in cavity 1a from leaking out of the outside of the drying shell 1 through the gap at the joint between the first shell and the second shell, in actual implementation, sealing gaskets can be provided between the first segment 101 and the fourth segment 104, between the second segment 102 and the fifth segment 105, and between the third segment 103 and the fifth segment 105, so as to improve the sealing performance of the first shell and the second shell at each joint position.

[0054] For example, the first segment 101, the third segment 103, the fourth segment 104, and the sixth segment 106 are all metal parts, such as stainless steel parts, while the second segment 102 and the fifth segment 105 are both made of PVC-coated canvas. That is, the excitation end housing 200 and the generator end housing 300 are both metal parts, and the intermediate fan cover 400 is made of PVC-coated canvas. The intermediate fan cover 400 is cylindrical in shape and is used to wrap the part of the generator rotor 100 corresponding to the rotor core 1009. The intermediate air cover 400 is made of PVC-coated canvas, giving it airtightness, heat insulation, fire resistance, and high-temperature resistance. This prevents the leakage of hot and dry gas from the cavity 1a, and also provides good heat insulation to prevent heat loss from the cavity 1a. The PVC-coated canvas also has a degree of flexibility, allowing the intermediate air cover 400 to be folded and stored when the drying device is not in use, facilitating its storage. Both the exciter end housing 200 and the generator end housing 300 are made of metal. Metal components have good rigidity, allowing them to maintain a relatively fixed shape for easy assembly with the generator rotor 100.

[0055] To facilitate the one-to-one connection of the intermediate wind shield 400 with the exciter end housing 200 and the generator end housing 300, rigid connectors are provided at both ends of the second segment 102 and the fifth segment 105. In this example, the rigid connectors are made of stainless steel. The rigid connectors are connected to the first segment 101 or the third segment 103, the fourth segment 104 and the sixth segment 106 by rivets, so that the second segment 102 is fixed one-to-one with the first segment 101 and the third segment 103, and the fifth segment 105 is fixed one-to-one with the fourth segment 104 and the sixth segment 106.

[0056] It should be noted that, in actual implementation, the materials of the first segment 101, the second segment 102, the third segment 103, the fourth segment 104, the fifth segment 105, and the sixth segment 106 can be flexibly selected as needed.

[0057] In another example, the first housing may be a one-piece structure, and the second housing may be a one-piece structure. For example, both the first housing and the second housing may be one-piece metal parts. There are no specific restrictions on the structure of the first housing and the second housing.

[0058] For example, a first sealing gasket is provided on the side of the first mounting sleeve 108 that is fitted with the generator rotor 100. Specifically, the first sealing gasket is a sealing rubber gasket. By providing a first sealing gasket on the side of the first mounting sleeve 108 that is fitted with the generator rotor 100, gas inside the cavity 1a can be effectively prevented from leaking from the fitting position of the first mounting sleeve 108 and the generator rotor 100.

[0059] For example, a second sealing gasket is provided on the side of the second mounting sleeve 107 that is fitted with the generator rotor 100. Specifically, the second sealing gasket is a sealing rubber gasket. By providing a second sealing gasket on the side of the second mounting sleeve 107 that is fitted with the generator rotor 100, gas inside the cavity 1a can be effectively prevented from leaking from the fitting position between the second mounting sleeve 107 and the generator rotor 100.

[0060] To ensure stable contact between the portion of the drying housing 1 near its first end and the generator rotor 100, thereby facilitating the relative fixation of the generator rotor 100 and the drying housing 1, the inner wall of the first mounting sleeve 108 is provided with at least two protrusions. These two protrusions, located at both ends along the axial direction of the first mounting sleeve 108, are annular in structure and abut against the outer periphery of the generator rotor 100's shaft. Specifically, the protrusions abut against the excitation end small shaft 1003. This ensures that both axial ends of the first mounting sleeve 108 are in contact with the excitation end small shaft 1003, improving the stability of the contact between the drying housing 1 and the engine rotor. The axis of the first mounting sleeve 108 coincides with the axis of the cavity 1a, meaning the axial direction of the first mounting sleeve 108 is parallel to the axial direction of the cavity 1a.

[0061] In this example, one end of the first mounting sleeve 108 extends into the interior of the cavity 1a, and the other end is flush with the outer wall of the drying housing 1. To stabilize the relative position of the first mounting sleeve 108 and the drying housing 1, the drying housing 1 is provided with multiple reinforcing ribs 111, all of which are located within the cavity 1a. One end of each reinforcing rib 111 is connected to the outer side of the first mounting sleeve 108, and the other end is connected to the inner wall of the cavity 1a. The multiple reinforcing ribs 111 are spaced apart around the axis of the first mounting sleeve 108, and a first ventilation hole 1b is formed between two adjacent reinforcing ribs 111. In this example, the first ventilation hole is fan-shaped. By connecting the inner wall of the cavity 1a and the first mounting sleeve 108 with the reinforcing ribs 111, the stable connection between the first mounting sleeve 108 and the drying housing 1 is enhanced. Furthermore, because a first ventilation hole 1b is formed between two adjacent reinforcing ribs 111, high-temperature and dry gas can circulate through the first ventilation hole 1b after entering the cavity 1a.

[0062] For example, combined Figure 4The drying housing 1 is also provided with a clamping ring 110, which is located near the second end and within the cavity 1a, close to the second mounting sleeve 107. The clamping ring 110 abuts against the outer periphery of the rotor's end retaining ring 1005. When assembling the generator rotor 100 with the drying device, the clamping ring 110 abuts against the outer periphery of the generator rotor 100's end retaining ring 1005, increasing the contact area between the drying housing 1 and the generator rotor 100. This allows the portion of the drying housing 1 near the second end to maintain stable contact with the generator rotor 100, facilitating the relative fixation of the generator rotor 100 and the drying housing 1.

[0063] Furthermore, the drying housing 1 is provided with a plurality of connecting ribs 109. One end of each connecting rib 109 is connected to the outer periphery of the clamping ring 110, and the other end is connected to the inner wall of the cavity 1a. The plurality of connecting ribs 109 are distributed at intervals around the axis of the clamping ring 110, and a second ventilation hole 1c is formed between two adjacent connecting ribs 109. In this way, the clamping ring 110 can be connected to the drying housing 1 by the connecting ribs 109, and high-temperature and dry gas can be circulated through the second ventilation hole 1c between two adjacent connecting ribs 109.

[0064] Furthermore, a third seal is provided on the side where the clamping ring 110 is sleeved with the generator end guard ring 1005. The third seal is a sealing gasket. The third seal prevents gas inside the cavity 1a from leaking from the sleeve position between the clamping ring 110 and the generator rotor 100. In addition, the third seal can also prevent the clamping ring 110 from scratching the generator end guard ring 1005.

[0065] In other embodiments, the drying housing 1 may be an integral structure. For this type of drying housing 1, to facilitate the placement of the generator rotor 100 located between the slip ring 1001 and the end retaining ring 1005 within the cavity 1a, both the first mounting sleeve 108 and the second mounting sleeve 107 are elastic sleeves, giving them the ability to elastically contract. Thus, when assembling the generator rotor 100 with the drying housing 1, external force expands the first mounting sleeve 108 and the second mounting sleeve 107, allowing the first mounting sleeve 108 or the second mounting sleeve 107 of the drying housing 1 to expand from the generator rotor. One end is fitted onto the generator rotor 100 and the entire drying housing 1 is moved along the axial direction of the generator rotor 100. The relative position of the drying housing 1 on the generator rotor 100 is adjusted so that when the part of the generator rotor 100 between the slip ring 1001 and the end guard ring 1005 is housed in the cavity 1a of the drying housing 1, the external force on the first mounting sleeve 108 and the second mounting sleeve 107 is removed. Under the action of elastic contraction force, the first mounting sleeve 108 and the second mounting sleeve 107 contract, so that the first mounting sleeve 108 and the second mounting sleeve 107 can be fitted onto the corresponding position of the rotating shaft, preventing gas from leaking from both ends of the drying housing 1 along the axial direction.

[0066] Of course, the structure of the drying housing 1 is not limited to this. In actual implementation, the drying housing 1 can also be set as an elastic element as a whole, and the side wall of the drying housing 1 can be provided with an opening. The drying housing 1 can be sleeved on the outer periphery of the generator rotor 100 through this opening. After the drying housing 1 and the generator rotor 100 are assembled in place, the drying housing 1 and the generator rotor 100 are fixed relative to each other by fasteners (such as screws or straps).

[0067] In some embodiments, see Figure 2 The air supply assembly includes a first fan 3, a dehumidifier 14, and a heater 15 connected in sequence. The first fan 3 is used to sequentially deliver outside air to the dehumidifier 14 and the heater 15, and then deliver it to the cavity 1a through the air supply end 901. In this example, the first fan 3 is a blower. The dehumidifier 14 is used to condense and cool the air to remove moisture. The air outlet of the heater 15 is connected to the air supply end 901, and the heater 15 is used to heat the air to obtain high-temperature and dry gas. The heater 15 is a heating component such as an electric heating grid or an electric heating wire. Under the action of the first fan 3, outside air can be delivered to the dehumidifier 14 and the heater 15. After the air is condensed and cooled by the dehumidifier 14 to remove moisture, it enters the heater 15. The heater 15 heats the low-temperature air to a set temperature, and then delivers it to the cavity 1a through the air supply end 901.

[0068] To better monitor air humidity and temperature, the air supply assembly also includes a humidity detector 18 and a temperature detector 19. The humidity detector 18 is positioned between the heater 15 and the dehumidifier 14, and the temperature detector 19 is positioned on the outlet side of the heater 15. This allows the humidity detector 18 to detect the air humidity at the outlet of the dehumidifier 14, and the temperature detector 19 to detect the air temperature at the outlet of the heater 15, ensuring that the humidity and temperature of the gas entering the drying housing 1 meet the requirements. In this example, a gas humidity of 35% detected by the humidity detector 18 is considered to meet the requirements; and a gas temperature of 60°C detected by the temperature detector 19 is considered to meet the requirements. Of course, in actual implementation, the parameters for meeting the requirements for gas humidity and temperature can be flexibly adjusted, and no specific limitations are imposed on these parameters here.

[0069] The air supply assembly also includes a first filter 5 and a second filter 6. The first filter 5 has a larger filter particle size than the second filter 6. The first filter 5 is located on the air inlet side of the first fan 3, and the second filter 6 is located on the air outlet side of the first fan 3, between the first fan 3 and the dehumidifier 14. In this example, the first filter 5 is a protective metal mesh, and the second filter 6 is a glass fiber filter. When the first fan 3 is working, the outside air passes through the first filter 5, the first fan 3, the second filter 6, the dehumidifier 14, and the heater 15 in sequence. When the air passes through the first filter 5 for primary filtration, it can intercept large particles of foreign matter such as paper scraps, iron wires, and welding slag in the air, preventing these large particles from entering the interior of the air supply assembly and causing blockage of the internal pipes. Because the second filter 6 is located on the air outlet side of the first fan 3 and has a smaller filter particle size, the resistance when the air passes through the second filter 6 is low, effectively intercepting small particles of foreign matter such as dust in the air. Thus, with the cooperation of the first filter 5 and the second filter 6, the cleanliness of the gas entering the drying housing 1 can be guaranteed, preventing the cooling ventilation channel in the generator rotor 100 from being blocked by impurities in the gas during the drying process, thereby improving the safety of the winding during the drying process.

[0070] Continue reading Figure 2 Referring to the figure, the gas supply assembly also includes a pressure detector 17, which is located between the first fan 3 and the second filter 6 to monitor the gas pressure on the outlet side of the first fan 3. In this example, a gas pressure of 1050 Pa detected by the pressure detector 17 is considered to meet the requirements. Of course, in actual implementation, the parameters for meeting the requirements of gas pressure and temperature can be flexibly adjusted.

[0071] Continue reading Figure 2The drying device also includes an exhaust pipe 11, and the air supply assembly includes an air supply box 9 and a second fan 4. The first fan 3, dehumidifier 14, heater 15, first filter 5, second filter 6, and second fan 4 are all disposed inside the air supply box 9. The air supply box 9 has a first side and a second side arranged opposite to each other. The first side has an air supply end 901 and a first air inlet end 902, which communicates with the first filter 5. The second side has a second air inlet end 903 and an air outlet end 904. When the first fan 3 is running, air from the atmosphere enters the first filter 5 from the first air inlet end 902. One end of the exhaust pipe 11 is connected to the drying housing 1 and communicates with the cavity 1a through the exhaust port 13. The other end of the exhaust pipe 11 is connected to the second air inlet end 903. The second fan 4 is connected between the second air inlet end 903 and the air outlet end 904. The second fan 4 is a blower used to drive the gas flow in the drying housing 1 and to discharge the gas that has been blown through the generator rotor 100 to the outside atmosphere. Specifically, when the second fan 4 is running, it drives the gas in the drying housing 1 to be sequentially transported from the exhaust port 13 through the exhaust pipe 11 to the second air inlet 903, the second fan 4, and the air outlet 904, thereby discharging the gas that has swept over the generator rotor 100 to the outside atmosphere. The first air inlet 902 and the air outlet 901 are located on the first side of the air supply box 9, and the second air inlet 903 and the air outlet 904 are located on the second side of the air supply box 9, so that the first air inlet 902 is far away from the air outlet 904, preventing the humid gas discharged from the air outlet 904 from entering the air supply box 9 from the first air inlet 902.

[0072] The cross-sectional shape of the air inlet duct 10 and the air outlet duct 11 can be circular or rectangular. Both the air inlet duct 10 and the air outlet duct 11 include a duct body, multiple steel frames, and connecting flanges. Two connecting flanges are provided, one at each end of the duct body. The multiple steel frames are located inside the duct body and are spaced apart and evenly distributed along the extension direction of the duct body. The duct body is made of high-temperature resistant silicone canvas. In actual implementation, fasteners (such as bolts) can be used to connect the connecting flanges at both ends of the air inlet duct 10 to the drying housing 1 and the air supply end 901 respectively, and fasteners (such as bolts) can be used to connect the connecting flanges at both ends of the air outlet duct 11 to the drying housing 1 and the second air inlet end 903 respectively. Of course, in other examples, the fasteners can be clamps or ropes, etc.

[0073] To prevent air leakage between the air inlet pipe 10 and the drying housing 1 and the air supply end 901, a sealing gasket can be installed between the air inlet pipe 10 and the drying housing 1 and the air supply end 901 to improve the sealing effect.

[0074] To prevent air leakage between the exhaust pipe 11 and the drying housing 1 and the second air inlet 903, a sealing gasket can be installed between the exhaust pipe 11 and the drying housing 1 and the second air inlet 903 to improve the sealing effect.

[0075] To facilitate the control of the gas supply assembly, the gas supply assembly also includes a controller 16 installed in the gas supply box 9. The controller 16 is electrically connected to the first fan 3, the humidifier, the heater 15, and the second fan 4.

[0076] The working process of the drying unit is described in detail below:

[0077] Combination Figures 2 to 4 The arrows in the diagram indicate the direction of gas flow. When the gas supply assembly is started, external gas enters the gas supply box 9 from the first air inlet 902 under the action of the first fan 3. The gas first passes through the first filter 5 for primary filtration, and then through the second filter 6. The second filter 6 intercepts small particles of foreign matter to form clean gas. The gas then enters the dehumidifier for condensation and cooling. After absorbing moisture from the gas, it enters the heater 15 for heating to form high-temperature and dry gas. Then, the high-temperature and dry gas enters the drying shell 1 from the air supply end 901 through the air inlet pipe 10. Under the action of the second fan 4, the gas flows from the air inlet 12 to the air outlet 13. During this process, the winding is dried with hot air in all directions. Finally, it is discharged to the outside atmosphere from the air outlet 904 through the air outlet pipe 11 and the second fan 4.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A winding drying device for a generator rotor, the generator rotor comprising a shaft, slip rings, and end retaining rings, wherein the slip rings and the end retaining rings are both disposed on the shaft and are spaced apart along the axial direction of the shaft, one end of the shaft protrudes from the side of the slip rings facing away from the end retaining rings, and the other end protrudes from the side of the end retaining rings facing away from the slip rings, characterized in that, include: A drying assembly includes a drying housing having a first end, a second end, a cavity, an air inlet, and an air outlet. The first end and the second end are positioned opposite each other. The air inlet is positioned near the first end, and the air outlet is positioned near the second end. Both the air inlet and the air outlet communicate with the cavity. The cavity is used to accommodate the portion of the generator rotor located between the slip ring and the end retaining ring. A first mounting sleeve is provided at the first end, and a second mounting sleeve is provided at the second end. Both the first and second mounting sleeves are used to fit around the outer periphery of the generator rotor shaft. An air supply assembly is disposed outside the drying housing and has an air supply end. The air supply end is connected to the cavity through the air inlet. The air supply assembly is used to supply high-temperature and dry gas to the cavity.

2. The generator rotor winding drying device according to claim 1, characterized in that, The drying housing includes a first housing and a second housing that can be docked to each other, with a cavity formed between the first housing and the second housing. The first housing has a first set of separate parts and a second set of separate parts at both ends along its length, and the second housing has a third set of separate parts and a fourth set of separate parts at both ends along its length. When the first housing and the second housing are docked, the first set of separate parts abuts against the third set of separate parts to form the first mounting sleeve, and the second set of separate parts abuts against the fourth set of separate parts to form the second mounting sleeve. At least one of the first housing and the second housing is provided with the air inlet and / or the air outlet.

3. The generator rotor winding drying device according to claim 2, characterized in that, The drying housing also includes a locking element for use between the first housing and the second housing.

4. The generator rotor winding drying device according to claim 2, characterized in that, It also includes a support assembly for supporting the drying housing, the support assembly being disposed on the first housing or the second housing.

5. The generator rotor winding drying device according to claim 1, characterized in that, A first sealing gasket is provided on the side of the first mounting sleeve that is sleeved with the generator rotor; And / or, a second sealing gasket is provided on the side of the second mounting sleeve that is fitted with the generator rotor.

6. The generator rotor winding drying device according to claim 1, characterized in that, The drying housing is also provided with a clamping ring, which is located in the cavity and close to the second mounting sleeve. The clamping ring is used to abut against the outer circumference of the end guard ring of the generator rotor.

7. The generator rotor winding drying device according to claim 6, characterized in that, The drying shell is also provided with a plurality of connecting ribs. One end of the connecting rib is connected to the outer peripheral side of the abutment ring, and the other end is connected to the inner side wall of the cavity. The plurality of connecting ribs are distributed at intervals around the axis of the abutment ring, and a second ventilation hole is formed between two adjacent connecting ribs.

8. The generator rotor winding drying apparatus according to any one of claims 1 to 6, characterized in that, The air supply assembly includes a first fan, a dehumidifier, and a heater connected in sequence. The first fan is used to deliver external air to the dehumidifier and the heater in sequence, and then deliver it to the cavity through the air supply end. The dehumidifier is used to condense and cool the air to remove moisture from the air. The air outlet of the heater is connected to the air supply end, and the heater is used to heat the air to obtain high-temperature and dry gas.

9. The generator rotor winding drying device according to claim 8, characterized in that, The air supply assembly further includes a first filter and a second filter. The filter particle size of the first filter is larger than that of the second filter. The first filter is disposed on the air inlet side of the first fan, and the second filter is disposed on the air outlet side of the first fan and located between the first fan and the dehumidifier.

10. The generator rotor winding drying device according to claim 9, characterized in that, The drying device further includes an exhaust pipe, and the air supply assembly further includes an air supply box and a second fan. The first fan, the dehumidifier, the heater, the first filter, the second filter, and the second fan are all disposed inside the air supply box. The air supply box has a first side and a second side arranged opposite to each other. The first side is provided with an air supply end and a first air inlet end, which are connected to the first filter. The second side is provided with a second air inlet end and an air outlet end. One end of the exhaust pipe is connected to the drying shell and communicates with the cavity through the exhaust port. The other end of the exhaust pipe is connected to the second air inlet end, and the second fan is connected between the second air inlet end and the air outlet end.

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