Cooling device of excitation system of hydro-generator

Abstract

The utility model discloses a cooling device for an excitation system of a hydro-generator, which comprises a cooling circular pipe air duct, a first end of the cooling circular pipe air duct is an air duct air inlet, and the cooling circular pipe air duct is used for being communicated with an outdoor fan; the second end of the cooling round pipe air duct is an air duct air outlet, and four branches are adopted and communicate with ventilation openings in the hydro-generator body correspondingly. Wherein the four ventilation openings are all formed in the hydraulic generator body; the first filter screen is arranged in the cooling circular pipe air duct and is arranged at one end of an air inlet of the air duct; and the plurality of second filter screens are arranged in the cooling round pipe air duct and are respectively arranged at one end of an air outlet of the air duct, and the number of the second filter screens is four. The cooling round pipe air duct is ingeniously designed to reduce air outlet resistance, enough air inlet amount is guaranteed, occupied space is saved, airflow is concentrated, the first filter screen and the second filter screen which are additionally arranged can prevent unclean air which is fed by the fan and contains dust and impurities from entering the cooling air duct, and the cooling effect is improved. The safety and reliability of a generator excitation system are improved, and equipment faults caused by over-high temperature of the carbon brush are avoided to a certain extent.

Description

Technical Field

[0001] The utility model relates to a cooling device for a hydro-generator, in particular to a cooling device for an excitation system of a hydro-generator. Background Art

[0002] Hydroelectric generators are the core equipment of hydropower stations. Their structure and cooling methods are crucial to ensuring stable operation and extending their service life. Hydroelectric generators consist of a rotor, stator, bearings, cooling system, and excitation system. The stator primarily comprises the frame, core, and windings, while the excitation system primarily comprises an excitation transformer, excitation regulator, slip rings, and carbon brushes. During normal operation, mechanical friction between the carbon brushes and slip rings generates heat, as does the contact resistance between the carbon brushes and slip rings. This heats up the carbon brushes, requiring the cooling system to dissipate the heat and cool them down.

[0003] Hydrogenerators typically use closed-circuit air cooling. The original generator cooling system consisted of only four discrete, right-angled plastic ducts. These ducts presented significant ventilation resistance, limited flow, and occupied a large space. The ducting material was easily damaged, and the system lacked an air filter. Dust and dirt entered the excitation system through the ducts, preventing the supply of sufficient, clean cooling air to cool the carbon brushes, causing damage. Summary of the Invention

[0004] The purpose of the utility model is to provide a cooling device for the excitation system of a hydro-generator, which aims to solve to a certain extent the problems of small air inlet volume, large air outlet resistance, large space occupied by the original cooling air duct, unclean cooling air, and easy damage of the pipeline material in the cooling air duct of the above-mentioned hydro-generator.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a cooling device for the excitation system of a hydro-generator, comprising: a cooling circular tube air duct, wherein the first end of the cooling circular tube air duct is an air duct inlet for connecting to an outdoor fan; the second end of the cooling circular tube air duct is an air duct outlet, which adopts four branches and is respectively connected to the vents on the hydro-generator body; wherein the four vents are all arranged on the hydro-generator body; a first filter is arranged in the cooling circular tube air duct and at one end of the air duct inlet; a plurality of second filters are arranged in the cooling circular tube air duct, each of which is arranged at one end of the air duct outlet, and there are four in total.

[0006] Furthermore, the cooling circular tube air duct includes an inlet tube body, four arc-shaped bend tube bodies and an outlet tube body. The inlet tube body and the outlet tube body are parallel and connected as a whole by the arc-shaped bend tube body.

[0007] Furthermore, the inlet portion of the pipe body is used for installing the first filter screen and is detachably connected; the outlet portion of the pipe body is used for installing the second filter screen and is detachably connected.

[0008] Furthermore, the four edges of the first filter screen and the second filter screen are respectively embedded in the built-in grooves of the cooling circular pipe air duct.

[0009] Furthermore, the sealing rings on the four edges of the first filter screen and the second filter screen are in close contact with the built-in grooves of the cooling circular pipe air duct.

[0010] Furthermore, the sealing ring is made of rubber.

[0011] Furthermore, the ventilation openings on the hydro-generator body are evenly arranged around the center of the top of the hydro-generator, and the four ventilation openings are fixedly connected to the four air duct outlets through flanges.

[0012] Furthermore, the flange is a flat welding flange.

[0013] Furthermore, the air duct outlet of the cooling circular tube air duct is inserted into the flange mounting hole and then welded.

[0014] Furthermore, each branch of the cooling circular tube air duct from the air duct inlet to the air duct outlet has two 45° arc angles.

[0015] Furthermore, the cooling circular tube air duct is a stainless steel air duct.

[0016] The beneficial effects of the present invention are as follows: the present invention cleverly designs a sturdy, high-temperature resistant cooling round tube stainless steel air duct to reduce the air outlet resistance, ensure sufficient air intake, save floor space, concentrate the airflow, and the added first filter and second filter can prevent unclean air containing dust and impurities sent in by the fan from entering the cooling air duct, thereby improving the safety and reliability of the generator excitation system and avoiding equipment failure caused by excessively high carbon brush temperature to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic front cross-sectional view of a preferred embodiment of the hydro-generator cooling device provided by the present invention;

[0019] Figure 2 for Figure 1 The enlarged structural diagram of the cooling circular pipe air duct is shown in FIG;

[0020] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of one of the cooling circular tube air ducts from the air duct inlet to the air duct outlet;

[0021] The numbers in the figure are: 100, cooling circular pipe air duct; 200, first filter; 301, second filter a; 302, second filter b; 401, air duct outlet a; 402, air duct outlet b; 403, air duct outlet c; 404, air duct outlet d; 500, hydro-generator body; 501, excitation system; 600, air duct inlet; 700, vent; 800, flange. DETAILED DESCRIPTION

[0022] The utility model will be further described below in conjunction with the accompanying drawings and embodiments, but the content of the utility model is not limited to the scope of the drawings.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0024] Please refer to Figure 1 、 Figure 2 and Figure 3 ,in, Figure 1 A schematic front cross-sectional view of a preferred embodiment of the hydro-generator cooling device provided by the present invention; Figure 2 for Figure 1 The enlarged structural diagram of the cooling circular pipe air duct is shown in FIG; Figure 3 for Figure 2 A cooling device for a hydro-generator excitation system includes: a cooling circular duct 100, wherein the first end of the cooling circular duct 100 is an air duct inlet 600 for connecting to an outdoor fan; the second end of the cooling circular duct is an air duct outlet (i.e., Figure 2401, air duct outlet a; 402, air duct outlet b; 403, air duct outlet c; 404, air duct outlet d;) shown in the figure, adopts four branches, which are respectively connected to the vents 700 on the hydro-generator body 500; wherein the four vents 700 are all arranged on the hydro-generator body 500; the first filter 200 is arranged in the cooling circular tube air duct 100, and is arranged at one end of the air duct air inlet 600; multiple second filters are arranged in the cooling circular tube air duct 100, respectively at one end of the air duct outlet a, the air duct outlet b, the air duct outlet c, and the air duct outlet d (as shown in the figure). Figure 1 The figure shows a second filter a301 installed at the air duct outlet a and a second filter b302 installed at the air duct outlet b (the same applies to the parts not shown). The first filter and the second filter can prevent dust, impurities and foreign matter from entering the turbine generator body 500 and causing damage to the turbine generator body 500, especially the excitation system 501.

[0025] It should be noted that the present invention is used for hydro-generators, such as Figure 1 An optional installation diagram is shown in FIG. Figure 1 In the embodiment, a hydro-generator body 500 and an excitation system 501 in the hydro-generator body 500 are involved. Four vents 700 are provided on the hydro-generator body 500. The four vents 700 are all provided on the hydro-generator body 500. The four vents 700 are fixedly connected to the four air duct outlets through flanges 800. At the same time, a steady stream of fresh air passes through the cooling circular pipe air duct 100 and enters the hydro-generator body 500 through the vents 700. Compared with closed-circulation air cooling, the above cooling method can prevent the overall air temperature from slowly rising and affecting the cooling effect.

[0026] Furthermore, the cooling circular tube air duct includes an inlet tube body, four arc-shaped bend tube bodies and an outlet tube body. The inlet tube body and the outlet tube body are parallel and connected as a whole by the arc-shaped bend tube body.

[0027] Specifically: Please refer to Figure 2 、 3 Each branch of the cooling circular duct from the duct inlet to the duct outlet has two 45° arc angles. Figure 1 The orientation shown, combined Figure 3 From the perspective of FIG, each branch from the air duct inlet to the air duct outlet includes an inner concave and an outer convex 45° arc angle.

[0028] Furthermore, the inlet portion of the pipe body is used for mounting the first filter screen 200 and the outlet portion of the pipe body is used for mounting the second filter screen and is detachably connected, such as a threaded connection.

[0029] Furthermore, the edges of the first filter 200 and the second filter are respectively embedded in the internal grooves of the cooling duct. The first filter and the second filter use G4 primary filters to meet slightly higher air volume requirements, provide lower resistance and higher dust holding capacity.

[0030] Furthermore, the edges of the first and second filters are fitted with sealing rings that tightly contact the internal grooves of the cooling duct. The sealing rings are made of rubber and ensure a complete seal around the first and second filters, minimizing the passage of air that has not passed through the first and second filters.

[0031] Furthermore, the flange is a 304 / GB / T 9119 PN6 DN600 slip-on flange. Slip-on flanges are suitable for medium and low-pressure pipelines, are easy to install, and are commonly used in ventilation duct systems. PN6 indicates a pressure rating of 6 bar (suitable for low-pressure systems), and DN600 represents a nominal diameter of 600 mm, matching the diameter of ventilation ducts. These flanges are typically made of 304 stainless steel, the same material as the pipes, for enhanced corrosion resistance.

[0032] Furthermore, the air outlet of the circular cooling duct is inserted into the flange mounting hole and then welded. Specifically, the inner diameter of the flange mounting hole is slightly larger than the outer diameter of the duct. The duct is inserted into the flange and then welded, making it suitable for ventilation purposes. The flange is installed with M20-M40 bolts and a rubber gasket to meet the sealing requirements of the ventilation system. During installation, it is recommended to tighten the bolts evenly to ensure that the flange presses against the gasket evenly to prevent air leakage.

[0033] Furthermore, the circular cooling ducts are made of stainless steel, which is more durable and heat-resistant than rectangular plastic ducts. For example, 304 / DN600 × 2mm stainless steel ventilation ducts are used. This inner diameter is suitable for environments with air volumes of 5000-8000 m³ / h and wind speeds of 5-10 m / s. The 304 stainless steel material and 2mm wall thickness ensure excellent durability in high-humidity environments without adding unnecessary weight, making it suitable for medium- to large-scale hydroelectric generators.

[0034] The working principle of the hydro-generator cooling device provided by the utility model is as follows:

[0035] When the device is in use, fresh air from the outside is first allowed to enter through the cooling circular duct 100. At this time, the internal operation of the hydro-generator body 500, especially the excitation system 501, generates heat. The fresh air passes through the first filter 200 and the second filter and is discharged to the vent 700 and discharged into the hydro-generator body 500, thereby cooling the excitation system 501, and then discharged from the other side of the hydro-generator.

[0036] Compared with the related art, the cooling device for the hydro-generator provided by the present invention has the following beneficial effects:

[0037] The present invention provides a hydro-generator cooling device. Four vents 700 are used to cool the interior of a hydro-generator body 500, particularly the excitation system 501. Fresh air is simultaneously continuously introduced into the hydro-generator body 100. This prevents the overall air temperature from slowly rising, which would otherwise affect the cooling effect, compared to closed-circuit air cooling. Fresh air is blown into the hydro-generator body 500 through a cooling circular duct 100. The circular arc design of the cooling circular duct 100 reduces air flow resistance, ensuring sufficient air intake, thereby enhancing the cooling effect. Furthermore, compared to conventional right-angled plastic ducts, the cooling circular duct 100 is more durable and heat-resistant, saves more space, and provides more concentrated airflow. Furthermore, the first filter 200 and the second filter prevent dust, impurities, and foreign matter from entering the interior of the hydro-generator body 500, thereby, to a certain extent, preventing damage to the interior of the hydro-generator body 500, particularly the excitation system 501.

[0038] The specific embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A cooling device for a hydro-generator excitation system, characterized in that: include: A cooling circular air duct, wherein the first end of the cooling circular air duct is an air duct inlet for communicating with an outdoor fan; the second end of the cooling circular air duct is an air duct outlet, which has four branches and is respectively communicated with vents on the hydro-generator body; wherein the four vents are all provided on the hydro-generator body; A first filter is provided in the cooling circular tube air duct and is arranged at one end of the air duct air inlet; A plurality of second filter screens are arranged in the cooling circular tube air duct, each of which is arranged at one end of the air outlet of the air duct, and there are four of them in total.

2. The cooling device for the excitation system of a hydro-generator according to claim 1, characterized in that: The cooling circular tube air duct comprises an inlet tube body, four arc-shaped bend tube bodies and an outlet tube body. The inlet tube body and the outlet tube body are parallel and connected as a whole by the arc-shaped bend tube body.

3. The cooling device for the excitation system of a hydro-generator according to claim 2, characterized in that: The pipe body at the inlet portion is used for installing the first filter screen and is detachably connected; the pipe body at the outlet portion is used for installing the second filter screen and is detachably connected.

4. The cooling device for the excitation system of a hydro-generator according to claim 1, characterized in that: The four edges of the first filter screen and the second filter screen are respectively embedded in the built-in grooves of the cooling circular pipe air duct.

5. The cooling device for the excitation system of a hydro-generator according to claim 4, characterized in that: The sealing rings on the four edges of the first filter screen and the second filter screen are in close contact with the built-in grooves of the cooling circular pipe air duct.

6. The cooling device for the excitation system of a hydro-generator according to claim 5, characterized in that: The sealing ring is made of rubber.

7. The cooling device for the excitation system of a hydro-generator according to claim 1, characterized in that: The vents on the hydro-generator body are evenly arranged around the center of the top of the hydro-generator, and the four vents are fixedly connected to the four air duct outlets through flanges.

8. The cooling device for the excitation system of a hydro-generator according to claim 7, characterized in that: The flange is a flat welding flange.

9. The cooling device for the excitation system of a hydro-generator according to claim 7, characterized in that: The air duct outlet of the cooling circular tube air duct is inserted into the flange mounting hole and then welded.

10. The cooling device for the excitation system of a hydro-generator according to claim 1, characterized in that: Each branch of the cooling circular tube air duct from the air duct inlet to the air duct outlet has two 45° arc angles.

11. The cooling device for the excitation system of a hydro-generator according to claim 1, characterized in that: The cooling circular tube air duct is made of stainless steel.

Images