CN110707885A

CN110707885A - Process method for assembling insulating sleeve on iron core back

Info

Publication number: CN110707885A
Application number: CN201911219605.9A
Authority: CN
Inventors: 董巍; 史孝轩; 顾元昊; 孟祥伟
Original assignee: Harbin Electric Machinery Co Ltd
Current assignee: Harbin Electric Machinery Co Ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-01-17

Abstract

The invention discloses a process method for assembling an insulating sleeve on the back of an iron core, which breaks through the conventional method for directly assembling the iron core with a positioning rib in a generator base, adds an insulating sleeve between the back of the iron core and the positioning rib, fixes the insulating sleeve through the structure of the iron core, and can ensure that the insulating sleeve can displace along with the iron core on the back of the iron core without the occurrence of insulating damage or insulating process. The process method provided by the invention ensures the tightness of the end part of the iron core, increases the insulating property between the positioning rib and the iron core, and avoids the situation that the iron core is burnt due to overlarge current at the back of the end part of the stator iron core.

Description

Process method for assembling insulating sleeve on iron core back

The technical field is as follows:

the invention relates to the field of turbonators, in particular to a process method for assembling an insulating sleeve on the back of an iron core.

Background art:

in order to solve the problems that the current at the back of the end part of the stator core is overlarge and the core is burnt, two ends of a positioning rib at the back of the core are provided with insulating sleeves. The insulating sleeve is an epoxy resin impregnated glass fiber laminated product, has the same shape as the locating rib dove tail, and can be sleeved on the locating rib dove tail. The length of the two ends of the iron core needs to be determined by considering the structure of the end part of the iron core, the structure of the iron core body, the local shrinkage of the iron core and the overall shrinkage of the iron core. The back of the iron core at the end part needs to be filled with an insulating sleeve, but the insulating sleeve cannot be propped against the finger pressing sheet, cannot be propped against the iron core, and cannot be randomly strung on the back of the iron core. A more precise process is needed to solve the above problems.

The invention content is as follows:

the invention provides a reliable, accurate and convenient process method for assembling the insulating sleeve on the back of the iron core. The technical scheme is as follows:

1) assembling the bottom insulating sleeve and the positioning rib: penetrating the bottom insulating sleeve into the locating rib pigeon tail, wherein the boss of the insulating sleeve faces downwards and is close to the pressing ring;

2) and (3) bottom iron core stacking: stacking an iron core outside the bottom insulating sleeve by taking the insulating sleeve pigeon tail as a reference;

3) iron core prepressing: applying pressure to the iron core section with the bottom insulating sleeve through an oil press, a nut pull rod and a sectional pressing tire, and releasing the pressure after the iron core is tightly pressed;

4) determining the length of the bottom insulating sleeve: after the iron core is pressed tightly, the length of the bottom insulating sleeve is higher than the height of one ventilation channel steel of the iron core, and redundant parts are marked and cut;

5) cleaning the insulating sleeve and the iron core for one time: after the bottom insulating sleeve is cut, the burrs on the bottom insulating sleeve are polished by a stabilizing piece, and insulating scraps on the iron core are cleaned by a dust collector;

6) and (3) continuously stacking the iron cores: the iron cores are continuously stacked and stacked to the position of the top insulating sleeve;

7) assembling the top insulating sleeve and the positioning rib: penetrating a top insulating sleeve into a locating rib pigeon tail, wherein a boss of the insulating sleeve faces downwards and is placed at the last layer of ventilation channel steel of the iron core section;

8) and (3) top iron core stacking: stacking an iron core on the outer side of the top insulating sleeve by taking the pigeon tail of the top insulating sleeve as a reference;

9) determining the length of the top insulating sleeve: a pressure finger assembly is arranged above the iron core, the back of the iron core is still completely covered on the top insulating sleeve after the iron core is integrally compressed, and the cutting position of the top insulating sleeve is positioned between the pressure finger and the first layer of iron core;

10) secondary cleaning of the insulating sleeve and the iron core: after the top insulating sleeve is cut, burrs on the top insulating sleeve are polished by a stable cutting piece, and insulating scraps on the iron core are cleaned by a dust collector.

The technical effects are as follows:

1. the invention thoroughly solves the problems of excessive current at the back of the iron core, burning of the iron core and the positioning ribs. In the past products, the clearance between the iron core and the positioning rib is too large, the single-side clearance exceeds 0.35mm, the creepage phenomenon can occur in the operation process, and the iron core is easy to burn. The process method for assembling the insulating sleeve on the back of the iron core adopted at this time reduces the gap between the positioning rib and the back of the iron core, thickens the insulating thickness between the positioning rib and the back of the iron core, and greatly improves the assembling quality of the end part of the iron core.

2. The invention relates to a mounting method of an insulation sleeve structure on the back of a stator core of a steam turbine generator, which is applied to a square positioning rib with a dove tail type for the first time.

3. By applying the invention, the iron core can axially displace under the rated pressing force state, the phenomena of damage and crack of the insulating sleeve can not occur, the insulating sleeve is ensured to axially displace along with the iron core, the fastening between the positioning rib and the back of the iron core is ensured, the product quality of the end part of the stator iron core is improved, the situations of looseness, burning loss and the like of the end part of the iron core in the running process of the steam turbine generator with the structure are reduced, and the maintenance cost of the stator of the steam turbine generator is greatly reduced.

Description of the drawings:

fig. 1 is a schematic view of the assembly among the top insulating sleeve, the positioning ribs and the iron core.

Fig. 2 is an assembly diagram of the bottom insulating sleeve, the positioning rib and the iron core.

Fig. 3 is a schematic view of the structure of the insulating sheath.

Fig. 4 is a schematic view of a vent slot steel structure.

The specific implementation mode is as follows:

as shown in fig. 1 and 2, the present invention is a process for assembling an insulating sleeve on the back of an iron core. The specific implementation process comprises the following steps: before the stator iron core is assembled, the bottom insulating sleeve 1 penetrates through the locating rib 2 to form a dove tail, and the boss 5 of the insulating sleeve faces downwards and falls on the pressing ring; an iron core 3 outside the bottom insulating sleeve 1 is stacked by taking the insulating sleeve pigeon tail 6 as a reference; applying pressure to the iron core 3 section with the bottom insulating sleeve 1 through an oil press, a nut pull rod and a sectional pressing tire, cutting the protruding length of the bottom insulating sleeve after the iron core 3 is pressed, marking and cutting redundant parts, wherein the length of the bottom insulating sleeve 1 is higher than the height of one ventilation channel steel 7 of the iron core 3; polishing the cut burrs on the bottom insulating sleeve 1 by using a stable cutting piece, and cleaning insulating scraps on the iron core 3 by using a dust collector; continuously stacking the iron core 3 to the position of the top insulating sleeve 8; penetrating a top insulating sleeve 8 into the dovetail of the positioning rib 2, enabling a boss 5 of the insulating sleeve to face downwards, and placing the insulating sleeve at the last layer of ventilation channel steel 7 of the iron core 3 section; stacking the iron core 3 on the outer side of the top insulating sleeve 8 by taking the pigeon tail of the top insulating sleeve 8 as a reference; in order to ensure that the back of the iron core 3 is still completely covered on the top insulating sleeve 8 after the iron core is integrally compressed, the cutting position of the top insulating sleeve 8 is positioned between the press finger 4 and the first layer of iron core 3; after the top insulating sleeve 8 is cut, burrs on the top insulating sleeve 8 are polished by a stable cutting piece, and insulating scraps on the iron core 3 are cleaned by a dust collector. And finishing the installation work of the insulating sleeve on the back of the iron core.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A process method for assembling an insulating sleeve on the back of an iron core is characterized by comprising the following steps: the method comprises the following steps:

1) assembling the bottom insulating sleeve and the positioning rib: penetrating the bottom insulating sleeve (1) into the dovetail of the positioning rib (2), wherein the boss (5) of the insulating sleeve faces downwards and is close to the pressing ring;

2) and (3) bottom iron core stacking: an iron core (3) outside the bottom insulating sleeve (1) is stacked by taking the insulating sleeve pigeon tail (6) as a reference;

3) iron core prepressing: applying pressure to the iron core (3) section with the bottom insulating sleeve (1) through an oil press, a nut pull rod and a sectional press tire, and releasing the pressure after the iron core (3) is tightly pressed;

4) determining the length of the bottom insulating sleeve: after the iron core (3) is tightly pressed, the length of the bottom insulating sleeve (1) is higher than the height of a ventilation channel steel (7) of the iron core (3), and redundant parts are marked and cut;

5) cleaning the insulating sleeve and the iron core for one time: after the bottom insulating sleeve (1) is cut, burrs on the bottom insulating sleeve (1) are polished by a stable cutting piece, and insulating scraps on the iron core (3) are cleaned by a dust collector;

6) and (3) continuously stacking the iron cores: the iron cores (3) are stacked and stacked to the position of the top insulating sleeve (8);

7) assembling the top insulating sleeve and the positioning rib: penetrating a top insulating sleeve (8) into a dovetail of the positioning rib (2), wherein a boss (5) of the insulating sleeve faces downwards and is placed at the last layer of ventilation channel steel (7) of the iron core (3);

8) and (3) top iron core stacking: stacking the iron core (3) outside the top insulating sleeve (8) by taking the pigeon tail of the top insulating sleeve (8) as a reference;

9) determining the length of the top insulating sleeve: a pressing finger (4) is arranged above the iron core (3), the back of the iron core (3) is still completely covered on the top insulating sleeve (8) after the iron core (3) is integrally compressed, and the cutting position of the top insulating sleeve (8) is positioned between the pressing finger (4) and the first layer of iron core (3);

10) secondary cleaning of the insulating sleeve and the iron core: after the top insulating sleeve (8) is cut, burrs on the top insulating sleeve (8) are polished by a stable cutting piece, and insulating scraps on the iron core (3) are cleaned by a dust collector.