Generator

Abstract

The utility model relates to the technical field of generators, and particularly discloses a generator, which comprises a shell, a stator, a rotor and two groups of cooling assemblies, the stator is arranged in a mounting cavity of the shell, and the stator and the inner wall of the mounting cavity form a first gas path in a surrounding manner in the circumferential direction of the stator; the two ends, in the axial direction of the stator, of the stator and the inner wall of the mounting cavity define second gas paths, and the two ends of the first gas path communicate with one ends of the two second gas paths correspondingly. The rotor comprises a rotating shaft and two impellers, the two impellers are coaxially and fixedly arranged on the rotating shaft and located on the two sides of the stator, and the other ends of the two second gas circuits are opposite to the two impellers correspondingly; the two cooling assemblies are arranged in the two second gas paths respectively, each cooling assembly comprises a cooler and a filter screen, a gas inlet of each cooler is opposite to one end of the corresponding second gas path, a gas outlet of each cooler is opposite to the other end of the corresponding second gas path, and the filter screens cover the gas inlets of the coolers. And when the cooling gas with the foreign matters passes through the filter screen, the foreign matters in the mounting cavity can be cleaned.

Description

Technical Field

[0001] The utility model relates to the technical field of generators, in particular to a generator. Background Art

[0002] Generators are a critical component of nuclear power plant equipment, and their safe and stable operation directly determines their economic profitability. Historical generator failures have often been caused by foreign matter, typically introduced during in-plant manufacturing, on-site installation, and commissioning. During normal operation, foreign matter can damage the insulation of the stator bars, block the rotor air duct, and cause localized rotor overheating, posing a threat to the generator's continued safe operation.

[0003] Therefore, there is an urgent need for a generator to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a generator to solve the problem in the related art that when there are foreign objects inside the generator, the foreign objects may affect the working stability of the generator.

[0005] The utility model provides a generator, which includes:

[0006] The housing is provided with a mounting cavity;

[0007] a stator disposed in the mounting cavity, the stator being spaced apart from the inner wall of the mounting cavity around the circumference of the stator to enclose a first gas path, and the stator being spaced apart from the inner wall of the mounting cavity at both ends of the stator along the axial direction to enclose a second gas path, the two ends of the first gas path being respectively connected to one end of two of the second gas paths;

[0008] a rotor, the rotor comprising a rotating shaft and two impellers, the two impellers being coaxially fixed to the rotating shaft and located on either side of the stator, the other ends of the two second gas paths being opposite to the two impellers respectively;

[0009] Two groups of cooling components, the two groups of cooling components are respectively arranged in the two second air paths, the cooling components include a cooler and a filter, the air inlet of the cooler is opposite to one end of the second air path, the air outlet of the cooler is opposite to the other end of the second air path, and the filter covers the air inlet of the cooler.

[0010] As an optimal technical solution for the generator, the top wall of the shell is provided with flange holes connected to the mounting cavity, and the number of the flange holes is the same as the number of the cooling components. The cooling component also includes a fixed flange, and the cooler extends into the mounting cavity through the flange hole and is fixed relative to the shell. The fixed flange is fixed to the shell and closes the flange hole.

[0011] As a preferred technical solution of the generator, the cooling assembly further includes a fixing member, which is located in the installation cavity and fixed to the housing, and is used to fix the cooler.

[0012] As a preferred technical solution of the generator, the fixing member includes a first accommodating cavity and a first opening, a second opening, and a third opening communicating with the first accommodating cavity, wherein the first opening is opposite to the flange hole, the second opening is opposite to the first gas path, and the third opening is opposite to the second gas path;

[0013] The cooler enters the first accommodating cavity through the flange hole and the first opening in sequence, the air inlet of the cooler is opposite to the second opening, and the air outlet of the cooler is opposite to the third opening.

[0014] As a preferred technical solution of the generator, the fixing member is used to fix the filter.

[0015] As a preferred technical solution of the generator, the fixing member further includes a second accommodating cavity and a fourth opening, a fifth opening, and a sixth opening communicating with the second accommodating cavity, the fourth opening being opposite to the flange hole, the fifth opening being opposite to the first gas path, and the sixth opening being opposite to the second opening;

[0016] The filter screen enters the second accommodating cavity through the flange hole and the fourth opening in sequence, the air inlet side of the filter screen is opposite to the fifth opening, and the air outlet of the filter screen is opposite to the sixth opening.

[0017] As a preferred technical solution of the generator, the fixing flange and the cooler are fixedly connected by bolts.

[0018] As a preferred technical solution of the generator, the fixing flange and the filter are fixedly connected by bolts.

[0019] As a preferred technical solution of the generator, each group of cooling assemblies is provided with at least two cooling assemblies, and each group of cooling assemblies is arranged at intervals around the circumference of the installation cavity.

[0020] As an optimal technical solution for the generator, the filter screen includes a metal wire mesh and a fireproof cotton mesh, and the fireproof cotton mesh is laid on the metal wire mesh.

[0021] The beneficial effects of the utility model are:

[0022] The utility model provides a generator, which includes a shell, a stator, a rotor and two groups of cooling components. The shell is provided with a mounting cavity; the stator is arranged in the mounting cavity, and the stator is spaced apart from the inner wall of the mounting cavity around the circumference of the stator to enclose a first air path, and the two ends of the stator along the axial direction of the stator are spaced apart from the inner wall of the mounting cavity to enclose a second air path, and the two ends of the first air path are respectively connected to one end of the two second air paths; the rotor includes a rotating shaft and two impellers, the two impellers are coaxially fixed to the rotating shaft and located on both sides of the stator, and the other ends of the two second air paths are respectively opposite to the two impellers; the two groups of cooling components are respectively arranged in the two second air paths, the cooling components include a cooler and a filter, the air inlet of the cooler is opposite to one end of the second air path, the air outlet of the cooler is opposite to the other end of the second air path, and the filter covers the air inlet of the cooler. Before the generator works, it is necessary to fill the installation cavity of the shell with cooling gas, and then drive the generator shaft to rotate. During this process, the two impellers rotate synchronously, thereby driving the airflow in the two second air paths to enter the stator hole of the stator. The airflow entering the stator hole then passes through the stator into the first air path. The gas in the first air path re-enters the two second air paths from both ends of the first air path, thereby forming two circulating air paths in the installation cavity. The cooling gas in the two circulating air paths brings the heat in the rotor and stator to the two sets of cooling components respectively, thereby cooling the rotor and stator. When there is foreign matter in the installation cavity, the cooling gas carries the foreign matter through the filter, and the foreign matter adheres to the filter, thereby cleaning the foreign matter in the installation cavity and preventing the foreign matter from affecting the stability of the generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a generator in Embodiment 1 of the present utility model;

[0024] Figure 2 This is a cross-sectional view of the generator in Example 1 of the present utility model;

[0025] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0026] Figure 4 This is a schematic structural diagram of the filter screen in Example 1 of the present utility model;

[0027] Figure 5 This is a schematic diagram of the assembly of the fixed flange, cooler and filter screen in the second embodiment of the present utility model;

[0028] In the picture:

[0029] 1. Housing; 11. First gas path; 12. Second gas path;

[0030] 2. Stator;

[0031] 3. Rotor; 31. Rotating shaft; 32. Impeller;

[0032] 41. Cooler; 42. Filter; 421. Wire mesh; 422. Fireproof cotton mesh; 43. Fixing flange; 44. Fixing piece; 441. First accommodating chamber; 442. Second accommodating chamber. DETAILED DESCRIPTION

[0033] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] Example 1

[0038] like Figures 1 to 4 As shown, this embodiment provides a generator, which includes a housing 1, a stator 2, a rotor 3 and two sets of cooling components. The housing 1 is provided with a mounting cavity; the stator 2 is disposed in the mounting cavity, and the stator 2 is spaced apart from the inner wall of the mounting cavity around the circumference of the stator 2 to enclose a first gas path 11. The two ends of the stator 2 along the axial direction of the stator 2 are spaced apart from the inner wall of the mounting cavity to enclose a second gas path 12. The two ends of the first gas path 11 are respectively connected to one end of the two second gas paths 12; the rotor 3 includes a rotating shaft 31 and two impellers 32. The two impellers 32 are coaxially fixed to the rotating shaft 31 and located on both sides of the stator 2. The other ends of the two second air paths 12 are opposite to the two impellers 32 respectively. Two sets of cooling components are respectively arranged in the two second air paths 12. The cooling components include a cooler 41 and a filter 42. The air inlet of the cooler 41 is opposite to one end of the second air path 12, and the air outlet of the cooler 41 is opposite to the other end of the second air path 12. The filter 42 covers the air inlet of the cooler 41. Before the generator is put into operation, it is necessary to fill the installation cavity of the housing 1 with cooling gas, and then drive the rotating shaft 31 of the generator to rotate. During this process, the two impellers 32 rotate synchronously, thereby driving the airflow in the two second air paths 12 into the stator hole of the stator 2. The airflow entering the stator hole then passes through the stator 2 and enters the first air path 11. The gas in the first air path 11 re-enters the two second air paths 12 from both ends of the first air path 11, thereby forming two circulating air paths in the installation cavity. The cooling gas in the two circulating gas paths carries the heat from the rotor 3 and stator 2 to the two sets of cooling components, respectively, thereby cooling the rotor 3 and stator 2. If there is foreign matter in the installation cavity, the cooling gas carries the foreign matter through the filter 42, and the foreign matter adheres to the filter 42, thereby clearing the foreign matter from the installation cavity and preventing it from affecting the stability of the generator operation.

[0039] Optionally, the top wall of the housing 1 is provided with flange holes communicating with the mounting cavity. The number of flange holes is the same as the number of cooling assemblies. The cooling assembly further includes a fixing flange 43. The cooler 41 extends into the mounting cavity through the flange hole and is fixed relative to the housing 1. The fixing flange 43 is fixedly connected to the housing 1 and closes the flange hole. In this embodiment, the fixing flange 43 is fixedly connected to the housing 1 by bolts, thereby closing the flange hole. This arrangement facilitates removal of the filter 42 on the air inlet of the cooler 41 and also facilitates maintenance of the cooler 41.

[0040] Optionally, a sealing ring is provided on the side where the fixing flange 43 abuts against the shell 1 , and the fixing flange 43 and the shell 1 clamp the sealing ring, thereby improving the sealing performance of the flange hole.

[0041] Optionally, the cooling assembly further includes a fixing member 44, which is located in the installation cavity and fixed to the housing 1, and is used to fix the cooler 41. In this embodiment, the fixing member 44 is used to fix the cooler 41 in the installation cavity to the housing 1.

[0042] Regarding the specific structure of the fixing member 44 fixing the cooler 41, optionally, the fixing member 44 includes a first accommodating cavity 441 and a first opening, a second opening, and a third opening connected to the first accommodating cavity 441, the first opening being opposite to the flange hole, the second opening being opposite to the first air path 11, and the third opening being opposite to the second air path 12; the cooler 41 enters the first accommodating cavity 441 through the flange hole and the first opening in sequence, the air inlet of the cooler 41 being opposite to the second opening, and the air outlet of the cooler 41 being opposite to the third opening. In this embodiment, the cooler 41 is inserted into the first accommodating cavity 441 through the first opening, thereby realizing that the fixing member 44 fixes the cooler 41 to the housing 1, the second opening can connect the air inlet of the cooler 41 to the first air path 11, and the third opening can connect the air outlet of the cooler 41 to the second air path 12.

[0043] Optionally, the fixing member 44 is used to fix the filter 42. In this embodiment, the fixing member 44 is used to fix the filter 42 on the housing 1, thereby fixing the filter 42 at the air inlet position of the cooler 41.

[0044] Regarding the specific structure of the fixing member 44 fixing the filter 42, optionally, the fixing member 44 also includes a second accommodating chamber 442 and a fourth opening, a fifth opening, and a sixth opening connected to the second accommodating chamber 442, the fourth opening being opposite to the flange hole, the fifth opening being opposite to the first air path 11, and the sixth opening being opposite to the second opening; the filter 42 enters the second accommodating chamber 442 through the flange hole and the fourth opening in sequence, the air inlet side of the filter 42 being opposite to the fifth opening, and the air outlet of the filter 42 being opposite to the sixth opening. In this embodiment, the filter 42 is inserted into the first accommodating chamber 441 through the fourth opening, thereby enabling the fixing member 44 to fix the filter 42 to the housing 1, the fifth opening being able to connect the air inlet of the filter 42 to the first air path 11, and the sixth opening being able to connect the air inlet of the cooler 41 to the air outlet side of the filter 42.

[0045] Optionally, each group of cooling assemblies is provided with at least two cooling assemblies, and each group of cooling assemblies is arranged at intervals around the circumference of the installation cavity. In this embodiment, each group of cooling assemblies is provided with two cooling assemblies, and the two groups of cooling assemblies are respectively located at the four corners of the top wall of the housing 1.

[0046] Optionally, the filter 42 includes a metal mesh 421 and a fireproof cotton mesh 422, and the fireproof cotton mesh 422 is laid on the metal mesh 421. In this embodiment, the metal mesh 421 mainly serves to support the fireproof cotton mesh 422, and the fireproof cotton mesh 422 is used to adsorb foreign matter in the cooler 41. The fireproof cotton mesh 422 has a fireproof effect, thereby preventing fire in the installation cavity under the action of high-temperature gas.

[0047] The steps for removing foreign matter from the generator include:

[0048] S10: The output shaft of the steam turbine is in transmission connection with the rotating shaft 31 of the engine. Before the steam turbine is started, the fixing flange 43 on the top wall of the generator housing 1 is opened, and the filter 42 is inserted into the flange hole and fixed to the housing 1 so that the filter 42 seals the air inlet of the cooler 41.

[0049] S20: The steam turbine is accelerated to the rated speed, and the purge is continued at the rated speed for more than an hour. Driven by the impeller 32 of the generator shaft 31, two circulating air paths are generated to purge the fine foreign matter inside the generator onto the filter 42.

[0050] S30: The steam turbine is idled to the main turning gear speed, the generator is depressurized, the fixing flange 43 above the cooler 41 is opened, and the filter 42 is removed.

[0051] S40: Check the cleanliness of the removed filter screen 42. The acceptance criteria are as follows:

[0052] Use a magnetic rod to check whether there is any ferromagnetic foreign matter on the filter 42.

[0053] Check with the naked eye whether there is any granular hard matter with a diameter exceeding 1 mm on the filter screen 42 .

[0054] Visually check that the filter 42 is clean and free of obvious contamination.

[0055] After the inspection is completed, if the acceptance criteria are not met, S10 is repeated until the foreign matter on the filter screen 42 meets the acceptance criteria.

[0056] Example 2

[0057] like Figure 5 As shown, this embodiment is substantially the same as the first embodiment, the only difference being that the fixing flange 43 is bolted to the cooler 41. The fixing flange 43 is also bolted to the filter 42. In this embodiment, by removing the fixing flange 43 from the housing 1, the cooler 41 and the filter 42 can be simultaneously removed from the flange hole. This arrangement facilitates quick assembly and disassembly of the cooler 41 and the filter 42.

[0058] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A generator, characterized in that include: A housing (1) is provided with a mounting cavity; The stator (2) is arranged in the installation cavity, and the stator (2) is spaced apart from the inner wall of the installation cavity around the circumference of the stator (2) to enclose a first air path (11). The stator (2) is spaced apart from the inner wall of the installation cavity at both ends along the axial direction of the stator (2) to enclose a second air path (12), and the two ends of the first air path (11) are respectively connected to one end of two second air paths (12); A rotor (3), the rotor (3) comprising a rotating shaft (31) and two impellers (32), the two impellers (32) being coaxially fixed to the rotating shaft (31) and located on both sides of the stator (2), and the other ends of the two second gas paths (12) being respectively opposite to the two impellers (32); Two groups of cooling components, the two groups of cooling components are respectively arranged in the two second air paths (12), the cooling components include a cooler (41) and a filter (42), the air inlet of the cooler (41) is opposite to one end of the second air path (12), the air outlet of the cooler (41) is opposite to the other end of the second air path (12), and the filter (42) covers the air inlet of the cooler (41).

2. The generator according to claim 1, characterized in that The top wall of the shell (1) is provided with flange holes connected to the installation cavity, and the number of the flange holes is the same as the number of the cooling components. The cooling component also includes a fixed flange (43). The cooler (41) extends into the installation cavity through the flange hole and is fixed relative to the shell (1). The fixed flange (43) is fixed to the shell (1) and closes the flange hole.

3. The generator according to claim 2, characterized in that The cooling assembly further comprises a fixing member (44), the fixing member (44) being located in the installation cavity and fixed to the housing (1), and the fixing member (44) being used to fix the cooler (41).

4. The generator according to claim 3, characterized in that The fixing member (44) includes a first accommodating cavity (441) and a first opening, a second opening, and a third opening communicating with the first accommodating cavity (441), wherein the first opening is opposite to the flange hole, the second opening is opposite to the first gas path (11), and the third opening is opposite to the second gas path (12); The cooler (41) enters the first accommodating cavity (441) through the flange hole and the first opening in sequence, the air inlet of the cooler (41) is opposite to the second opening, and the air outlet of the cooler (41) is opposite to the third opening.

5. The generator according to claim 4, characterized in that The fixing member (44) is used to fix the filter screen (42).

6. The generator according to claim 5, characterized in that The fixing member (44) further includes a second accommodating cavity (442) and a fourth opening, a fifth opening, and a sixth opening communicating with the second accommodating cavity (442), wherein the fourth opening is opposite to the flange hole, the fifth opening is opposite to the first gas path (11), and the sixth opening is opposite to the second opening; The filter screen (42) enters the second accommodating chamber (442) through the flange hole and the fourth opening in sequence, the air inlet side of the filter screen (42) is opposite to the fifth opening, and the air outlet of the filter screen (42) is opposite to the sixth opening.

7. The generator according to claim 2, characterized in that The fixing flange (43) is fixedly connected to the cooler (41) by bolts.

8. The generator according to claim 2, characterized in that The fixing flange (43) and the filter screen (42) are fixedly connected by bolts.

9. The generator according to any one of claims 1 to 8, characterized in that: Each group of cooling assemblies is provided with at least two cooling assemblies, and each group of cooling assemblies is arranged at intervals around the circumference of the installation cavity.

10. The generator according to any one of claims 1 to 8, characterized in that: The filter screen (42) comprises a metal wire screen (421) and a fireproof cotton screen (422), and the fireproof cotton screen (422) is laid on the metal wire screen (421).

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