Air gap insulating partition plate capable of improving cooling suburb of large steam turbine generator

Abstract

The utility model relates to the technical field of steam turbine generators, in particular to a large steam turbine generator air gap insulation partition plate capable of improving cooling suburb, which comprises a stator, a plurality of hydrogen inlet areas and hydrogen discharge areas which are alternately arranged are arranged in an inner cavity of the stator along the axial direction, a plurality of original insulation slot wedges are uniformly and annularly arranged on the stator along the circumferential direction at intervals, and the large steam turbine generator air gap insulation partition plate further comprises an insulation partition plate, the insulating partition plate is of an annular structure with an opening in the bottom, the insulating partition plate is coaxially arranged at the position between the hydrogen inlet area and the hydrogen discharge area in the stator, and the outer arc side portion of the insulating partition plate is installed on the corresponding original insulating slot wedge; due to the arrangement of the insulating partition plate, most of the area between the hydrogen inlet area and the hydrogen discharge area can be separated, mutual diffusion of hydrogen in the hydrogen inlet area and the hydrogen discharge area is reduced, and the cooling effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine generators, in particular to an air gap insulating partition for improving the cooling effect of a large steam turbine generator. Background Art

[0002] Steam turbine generators will generate energy losses during operation. These losses will be converted into heat inside the motor, causing the temperature of various parts to rise. In order to prevent the motor temperature from exceeding the allowable limit, the motor must be cooled.

[0003] At present, all existing large steam turbine generators adopt segmented steam gap air cooling, that is, the stator and rotor air gaps have alternating hydrogen inlet areas (cold air areas) and hydrogen outlet areas (hot air areas); for example, a 300,000-kilowatt steam turbine generator adopts a four-inlet and five-out cooling method, and a 600,000-kilowatt generator adopts a six-inlet and seven-out cooling method. However, there is no barrier at the boundary of the existing steam gap hydrogen inlet and outlet areas, and the cold and hot hydrogen diffuse at the boundary, affecting the efficiency of cooling the stator and rotor.

[0004] To this end, we designed an air gap insulation partition for large steam turbine generators to improve cooling efficiency. Utility Model Content

[0005] In order to overcome the deficiencies in the background technology, the utility model discloses an air gap insulating partition for a large steam turbine generator capable of improving the cooling effect.

[0006] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solutions:

[0007] An air gap insulating partition for improving cooling effect of a large steam turbine generator comprises a stator, wherein the inner cavity of the stator is provided with a plurality of alternately arranged hydrogen inlet zones and hydrogen exhaust zones along its axial direction, the stator is provided with a plurality of original insulating slot wedges evenly spaced along its circumference, and further comprises an insulating partition, wherein the insulating partition is an annular structure with an opening at the bottom, the insulating partition is coaxially arranged between the hydrogen inlet zone and the hydrogen exhaust zone in the stator, and the outer arc side of the insulating partition is installed on the corresponding original insulating slot wedge.

[0008] Preferably, a protruding structure is provided on the inner side wall of the original insulating slot wedge corresponding to the insulating partition at the position of the hydrogen inlet area and the hydrogen exhaust area, and the outer arc side of the insulating partition is correspondingly connected to the protruding structure.

[0009] Preferably, a plug-in groove is provided in the middle of the inner side wall of the protruding structure, and the outer arc side of the insulating partition is correspondingly plugged into the plug-in groove.

[0010] Preferably, the plug-in slot is matched with an insulating plug rod that penetrates the slot wall and the insulating partition.

[0011] Preferably, the width of the insertion slot cavity is greater than the slot opening width.

[0012] Preferably, the opening angle of the insulating partition is 50 to 70 degrees.

[0013] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0014] 1. The setting of the insulating partition can separate most of the area between the hydrogen inlet area and the hydrogen outlet area, reduce the mutual diffusion of hydrogen in the hydrogen inlet area and the hydrogen outlet area, and improve the cooling effect;

[0015] 2. The setting of the opening at the bottom of the insulating partition can reduce the mutual diffusion of hydrogen between the hydrogen inlet area and the hydrogen exhaust area without affecting the disassembly and assembly of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is the front view of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the insulating slot wedge group and the new insulating slot wedge group in the utility model;

[0019] Figure 4 It is a schematic diagram of the exploded structure of the new insulating slot wedge in the utility model.

[0020] In the figure: 1. stator; 2. original insulating slot wedge; 3. insulating partition; 4. raised structure; 41. plug-in slot; 5. insulating plug rod. DETAILED DESCRIPTION

[0021] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. to indicate directions or positional relationships, they only correspond to the drawings of the present application, in order to facilitate the description of the present invention; it should be understood that if there are terms such as "end", "side", "end part", "lateral", "lateral", "transverse", "longitudinal", etc. to indicate directions or positional relationships, they only correspond to the length and width of the corresponding parts, that is, "end part" indicates the head and tail areas in the length direction of the corresponding part, and "side part" indicates the head and tail areas in the width direction of the corresponding part; this is for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction.

[0022] Embodiment 1, in combination with the attached Figure 1-4A large steam turbine generator can improve the cooling effect of the air gap insulation partition, including a stator 1, the inner cavity of the stator 1 is provided with a plurality of alternately arranged hydrogen inlet areas and hydrogen exhaust areas along its axial direction, and the stator 1 is provided with a plurality of original insulating slot wedges 2 along its circumferential direction at even intervals; it should be noted that: the inner wall of the stator 1 is provided with installation grooves for installing coils along its circumferential direction, and the original insulating slot wedges 2 are clamped at the notch of the installation groove for crimping the coil;

[0023] It also includes an insulating partition 3, which is a ring-shaped structure with an opening at the bottom. The insulating partition 3 is coaxially arranged between the hydrogen intake area and the hydrogen exhaust area in the stator 1, and the outer arc side of the insulating partition 3 is installed on the corresponding original insulating slot wedge 2.

[0024] Preferably, the opening angle of the insulating partition 3 is 50-70 degrees. Specifically, when the rotor is disassembled and assembled, when the bottom of the rotor contacts the inner bottom surface of the stator 1, the rotor does not contact the insulating partition 3, so as to prevent the rotor from colliding with the insulating partition 3 when the rotor is axially pulled, thereby damaging the insulating partition 3. In other words, the opening at the bottom of the insulating partition 3 is used to facilitate the disassembly and assembly of the rotor.

[0025] Specifically, the size between the inner arc surface and the outer arc surface of the insulating partition 3 is set according to the air gap width between the stator 1 and the rotor, so the size is not specifically limited. Preferably, there is a gap between the inner arc surface of the insulating partition 3 and the rotor, and the smaller the gap, the better the effect.

[0026] According to the needs, the insulating partition 3 can be an integral structure or composed of a plurality of small partitions. When the insulating partition 3 is composed of a plurality of small partitions, the number of small partitions is consistent with the number of the insulating partition 3 corresponding to the original insulating slot wedges 2, and they are installed one by one.

[0027] As required, the insulating partition 3 can be made of insulating silicone rubber with a heat resistance grade of F, so as to ensure that the insulating partition 3 is non-conductive, does not induce magnetic fields and is not prone to thermal aging.

[0028] In this way, most of the area between the hydrogen inlet area and the hydrogen outlet area is separated by the insulating partition 3, which reduces the mutual diffusion of hydrogen between the hydrogen inlet area and the hydrogen outlet area and improves the cooling effect. In the specific test, the cooling efficiency of the steam turbine generator is improved by about 15%.

[0029] Embodiment 2, combined with the attached Figure 1-4 A large steam turbine generator can improve the cooling effect of the air gap insulating partition. On the basis of the first embodiment, the inner wall of the original insulating slot wedge 2 corresponding to the insulating partition 3 is provided with a protruding structure 4 at the position of the hydrogen intake area and the hydrogen exhaust area, and the outer arc side of the insulating partition 3 is correspondingly connected to the protruding structure 4.

[0030] Furthermore, a plug-in groove 41 is provided in the middle of the inner side wall of the protruding structure 4 , and the outer arc side of the insulating partition 3 is correspondingly plugged into the plug-in groove 41 .

[0031] Furthermore, in order to improve the stability of the insulating partition 3, the insertion slot 41 is matched with an insulating rod 5 that penetrates its slot wall and the insulating partition 3; in this way, the position of the insulating partition 3 can be limited by the insulating rod 5 to prevent the position of the insulating partition 3 from being offset.

[0032] It should be noted that: when the protruding structure 4 cannot be stably fixed on the original insulating slot wedge 2, a new insulating slot wedge can be made, and the new insulating slot wedge is an integrally formed part of the protruding structure 4 and the original insulating slot wedge 2. As needed, the new insulating slot wedge can be made of epoxy glass fiber and epoxy resin, and the material can also be the same as the material of the original insulating slot wedge 2.

[0033] When the insulating partition 3 is an integral structure, the plug-in slot 41 is a U-shaped slot. When the insulating partition 3 is composed of multiple small partitions, the plug-in slot 41 can be a U-shaped slot, or the slot cavity width can be greater than the slot width; for example, the plug-in slot 41 is a dovetail slot, a T-shaped slot, etc.

[0034] The insulating partition 3 is formed by splicing a plurality of small partitions, and each protruding structure 4 has at least two insulating plug rods 5 .

[0035] According to the needs, the outer arc surface of the insulating partition 3 and the inner wall of the stator 1 can be in contact with each other as much as possible.

[0036] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. An air gap insulating partition for a large steam turbine generator capable of improving cooling effect, comprising a stator (1), wherein the inner cavity of the stator (1) is provided with a plurality of hydrogen inlet areas and hydrogen outlet areas arranged alternately along its axial direction, and the stator (1) is provided with a plurality of original insulating slot wedges (2) arranged at even intervals along its circumference, characterized in that: It also includes an insulating baffle (3), which is an annular structure with an opening at the bottom, and is coaxially arranged between a hydrogen intake area and a hydrogen exhaust area in the stator (1), and an outer arc side of the insulating baffle (3) is installed on a corresponding original insulating slot wedge (2).

2. The air gap insulating partition for improving cooling effect of a large steam turbine generator according to claim 1, characterized in that: The inner side wall of the original insulating slot wedge (2) corresponding to the insulating partition (3) is provided with a protruding structure (4) at the position of the hydrogen inlet area and the hydrogen outlet area, and the outer arc side of the insulating partition (3) is correspondingly connected to the protruding structure (4).

3. The air gap insulating partition for improving cooling effect of a large steam turbine generator according to claim 2, characterized in that: A plug-in slot (41) is provided in the middle of the inner side wall of the protruding structure (4), and the outer arc side of the insulating partition (3) is correspondingly plugged into the plug-in slot (41).

4. The air gap insulating partition for improving cooling effect of a large steam turbine generator according to claim 3, characterized in that: The plug-in slot (41) is matched with an insulating plug rod (5) that penetrates the slot wall and the insulating partition (3).

5. The air gap insulating partition for improving cooling effect of a large steam turbine generator according to claim 3, characterized in that: The slot cavity width of the plug-in slot (41) is greater than the slot opening width.

6. The air gap insulating partition for improving cooling effect of a large steam turbine generator according to claim 1, characterized in that: The opening angle of the insulating partition (3) is 50 to 70 degrees.

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