Steam turbine generator main lead ventilation structure

Abstract

The utility model relates to a steam turbine generator main lead ventilation structure which is composed of an insulation box, a flexible connector, main lead hollow copper bars, a metal ventilation pipe, an insulation ventilation pipe and a wind shield, a generator leading-out terminal and a neutral point terminal are provided with six leading-out wire copper bars wrapped with insulation materials, and two L-shaped ventilation channels are formed in each main lead hollow copper bar. The head end of the main lead hollow copper bar is connected with a stator phase lead through flexible connection, the connection mode adopts a bolt fastening structure, an insulation box is sleeved outside the flexible connection, a metal ventilation pipe is welded at a ventilation hole at the tail end of the main lead hollow copper bar, and the whole main lead hollow copper bar is connected with the insulation ventilation pipe. And a wind shield is arranged at the position where the main lead hollow copper bar penetrates out of the wire outlet cover and the foundation wall body. According to the utility model, the parallel wind path structure design is adopted, the temperature of the main lead of the large-scale air-cooled steam turbine generator is greatly reduced, and the safety and reliability of unit operation are obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine generators, in particular to a main lead ventilation structure of a steam turbine generator. Background Art

[0002] Modern air-cooled steam turbine generators are widely used in small and medium-sized power plants due to their simple systems, high safety, ease of maintenance, and economical efficiency. The stator lead wires of steam turbine generators, as key components for power output, primarily conduct the stator current from the generator's interior to the exterior. Their structure and quality are directly related to the reliability of the generator's operation. With the continuous increase in the capacity of domestic air-cooled units, the design requirements for generator lead wires have also gradually increased. As the current carried by the lead wires increases, optimizing the ventilation and cooling of existing stator lead wires has significantly enhanced the application and development of large air-cooled steam turbine generators. Summary of the Invention

[0003] In view of this, the purpose of the utility model is to disclose a ventilation structure for the stator lead wire of a steam turbine generator, which changes the internal cooling air path of the hollow copper bar of the main lead wire to parallel connection, greatly increasing the cooling air volume inside the copper bar while shortening the cooling path, greatly improving the cooling effect, and making the temperature rise of the lead wire of the air-cooled steam turbine generator lower, and the performance is more excellent and stable.

[0004] The technical solution of the utility model is: a main lead ventilation structure of a steam turbine generator, which is composed of an insulating box, a flexible connection, a main lead hollow copper busbar, a metal ventilation pipe, an insulating ventilation pipe, a wind shield, and a wire cover wind shield to form the main lead ventilation structure, the upper end of the flexible connection is connected to the stator phase lead, and the lower end is connected to the first section of the main lead hollow copper busbar, an insulating box is provided on the outside of the flexible connection, the front end blockage inside the main lead hollow copper busbar is cancelled, and only the end of the lead copper busbar is blocked, so that the internal air paths of the lead copper busbar are connected in parallel, a ventilation hole is opened at a position 370 mm away from the tail end of the main lead hollow copper busbar, a metal ventilation pipe is welded at the position of the ventilation hole, and the outside of the metal ventilation pipe is connected to the insulating ventilation pipe to form a passage, and cold air enters the lead hollow copper busbar through the insulating box, flows into the tail end of the lead hollow copper busbar, and then is collected and enters the insulating ventilation pipe to flow into the front wind area of the generator fan, thereby completing the cooling of the main lead hollow copper busbar.

[0005] As a further solution of the present invention: the cross sections of the two ventilation holes of the main lead hollow copper busbar are both curved cross sections.

[0006] As a further solution of the present invention: two "L"-shaped ventilation ducts are formed inside the main lead hollow copper busbar, and the main lead hollow copper busbar, the metal ventilation pipe and the insulating ventilation pipe together form a "U"-shaped ventilation duct.

[0007] As a further solution of the present invention: each of the main lead hollow copper busbars is equipped with a separate insulating ventilation tube, a total of six, and the insulating ventilation tube on the neutral point side is longer than the insulating ventilation tube on the outgoing line side.

[0008] As a further solution of the present invention: the length of the neutral point side insulating ventilation pipe is greater than the outgoing line side insulating ventilation pipe.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] The utility model eliminates the wind shield welded inside the hollow copper busbar of the main lead in the traditional technical structure, simplifies the internal structure of the hollow copper busbar of the main lead, and changes the internal air route of the main lead from series to parallel, greatly reducing the cooling path to 1 / 2 of the original. Under the same cold air temperature, the shorter the air path, the more conducive to the heat dissipation inside the main lead; at the same time, the cross-sectional profile of the ventilation hole inside the stator main lead is optimized from a rectangle to a curve, which increases the effective ventilation area and reduces wind resistance. The above two methods greatly improve the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the utility model;

[0012] Figure 2 This is a schematic diagram of the air path at the first end of the main lead copper bar of the utility model;

[0013] Figure 3 This is a schematic diagram of the air path at the tail end of the main lead copper bar of the utility model;

[0014] Figure 4 This is a schematic diagram of the main lead air path of the utility model;

[0015] Figure 5 For this utility model Figure 1 Right side view of the main lead;

[0016] Figure 6 For this utility model Figure 1 Main lead BB cross-sectional view;

[0017] Figure 7 This is a schematic cross-sectional view of the main lead copper bar of the utility model;

[0018] Explanation of the markings in the figure: 1-insulation box; 2-flexible connection; 3-hollow copper busbar for main lead; 4-metal ventilation pipe; 5-insulated ventilation pipe; 6-wind shield; 7-wind shield for outlet cover. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "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 specific circumstances.

[0021] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, a steam turbine generator stator main lead ventilation structure consists of an insulation box 1, a flexible connection 2, a main lead hollow copper busbar 3, a metal ventilation pipe 4, an insulating ventilation pipe 5, a windshield 6, and a wire outlet cover windshield 7. The upper end of the main lead hollow copper busbar 3 is connected to the stator phase lead bar through the flexible connection 2. The insulation box 1 is installed on the outside of the flexible connection 2. The insulation box 1 provides an air path so that the cooling air in the generator outlet cover flows through the flexible connection 2 and is then led into the main lead hollow copper busbar. The traditional windshield block at the top of the main lead hollow copper busbar has been eliminated, resulting in two parallel "L"-shaped air paths inside each main lead hollow copper busbar 3. A metal ventilation tube 4 is welded to the ventilation hole 370mm from the end of the main lead hollow copper busbar. Each metal ventilation tube 4 is sheathed with an insulating ventilation tube 5 and secured with a clamp. The insulating ventilation tube 5 directs hot air into the front wind area of the generator fan, forming a "U"-shaped main lead ventilation structure. A windshield 7 is installed where the main lead hollow copper busbar 3 passes through the outlet cover, securing it to the outlet cover opening. A windshield 6 is installed where the main lead hollow copper busbar 3 passes through the wall, securing it to the foundation wall to prevent air mixing and form a complete sealed structure.

[0022] like Figure 4 、 Figure 5 As shown, the insulating ventilation pipe 5 is an epoxy laminated glass cloth pipe, with a total of six. The insulating ventilation pipe 5 on the outgoing line side is located at the upper part of the "L"-shaped tail end of the main lead hollow copper busbar, and the insulating ventilation pipe on the neutral point side is located on the left and right sides of the main lead hollow copper busbar. The length of the insulating ventilation pipe on the neutral point side is greater than that of the insulating ventilation pipe on the outgoing line side.

[0023] like Figure 6 As shown, the ventilation opening cross section of the main lead hollow copper busbar 3 is a curved cross section, which increases the ventilation area and effectively reduces wind resistance.

[0024] The preferred embodiments of the present invention are described in detail above, but 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 steam turbine generator main lead ventilation structure, characterized by: The main lead wire ventilation structure is composed of an insulating box (1), a flexible connection (2), a main lead wire hollow copper bar (3), a metal ventilation pipe (4), an insulating ventilation pipe (5), a wind shield (6), and a wire outlet cover wind shield (7). The upper end of the flexible connection (2) is connected to the stator phase lead wire, and the lower end is connected to the first section of the main lead wire hollow copper bar (3). The outside of the flexible connection is provided with an insulating box (1), and the end of the main lead wire hollow copper bar (3) is sealed. The internal air paths of the lead wire copper bar are connected in parallel. A ventilation hole is opened at a position 370 mm away from the tail end of the main lead wire hollow copper bar (3). A metal ventilation pipe (4) is welded at the ventilation hole position. The outside of the metal ventilation pipe (4) is connected to the insulating ventilation pipe (5) to form a passage.

2. A steam turbine generator main lead ventilation structure according to claim 1, characterized in that: The cross sections of the two ventilation openings of the main lead hollow copper busbar (3) are both curved cross sections.

3. The main lead ventilation structure of a steam turbine generator according to claim 1, characterized in that: Two "L"-shaped ventilation ducts are formed inside the main lead hollow copper busbar (3), and the main lead hollow copper busbar (3), the metal ventilation pipe (4), and the insulating ventilation pipe (5) together form a "U"-shaped ventilation duct.

4. The main lead ventilation structure of a steam turbine generator according to claim 1, characterized in that: Each of the main lead hollow copper bars (3) is equipped with a separate insulating ventilation tube (5), with a total of six of them. The insulating ventilation tube (5) on the neutral point side is longer than the insulating ventilation tube (5) on the outgoing line side.

5. A steam turbine generator main lead ventilation structure according to claim 4, characterized in that: The neutral point side insulating ventilation pipe (5) is longer than the outgoing line side insulating ventilation pipe (5).

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