CN209919049U

CN209919049U - Flux-cored brazing special support for carbon steel solid magnetic pole and red copper damping ring of synchronous motor

Info

Publication number: CN209919049U
Application number: CN201920404700.5U
Authority: CN
Inventors: 杜雷; 张锁瑶; 戚嵩; 刘大为; 宋丹; 张晨光; 黄秀波
Original assignee: Harbin Electric Power Equipment Co Ltd
Current assignee: Harbin Electric Power Equipment Co Ltd
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-01-10
Anticipated expiration: 2029-03-28

Abstract

The utility model relates to a flux-cored brazing special brazing support for a carbon steel solid magnetic pole and a red copper damping ring of a synchronous motor, a plurality of I-shaped steels and steel plates form a four-corner platform 7 which is stably connected by a welding mode, an integral forging piece processing supporting base 8 is adopted, a supporting rod 12 and a carbon steel solid magnetic pole 1 have the same convex-concave structure, and the support is fixed by a standard component 13 for fixing; and is pressed by matching with a pressing device 11. The utility model improves the filling efficiency and saves the brazing time, thereby improving the quality of the joint; meanwhile, the special brazing support is adopted for assembly and fixation, and the problems that the process bolt cannot resist high temperature and cannot be reused are solved.

Description

Flux-cored brazing special support for carbon steel solid magnetic pole and red copper damping ring of synchronous motor

The technical field is as follows:

the utility model relates to a flux core of synchronous motor carbon steel solid magnetic pole and red copper damping ring special use support of brazing.

Background art:

a typical rotor winding structure of a synchronous motor is formed by connecting a rotor solid magnetic pole and a damping bar, and mainly has the functions of realizing asynchronous starting of the synchronous motor, leading direct current to a rotor coil after the synchronous speed is transited to synchronous speed, enabling a rotor and a stator rotating magnetic field to rotate synchronously, and enabling a motor to enter a synchronous operation state.

The solid magnetic pole is made of common carbon steel, the damping ring is made of red copper, and the solid magnetic pole and the damping ring are brazed together and are reinforced by bolts. The solid magnetic pole and the damping ring are required to be well connected with the brazing joint surface, if the brazing quality is poor, the phenomena of sparking, welding starting, overhigh temperature rise and the like can be generated in the starting process of the motor, and the stator winding can be damaged and scrapped seriously.

At present, the common method for brazing of the same structure is to mix QJ102 brazing flux into paste, coat the paste on a connecting contact surface, prefabricate silver-copper-zinc brazing sheets BAg45CuZn, drill process holes in positions of bolt holes of a damping ring, assemble and fix by using process bolts and perform flame brazing, and simultaneously dip the ends of solid same brazing filler metal welding wires in the brazing flux for filling. The method has the defects that soldering flux is not uniform, so that soldering lugs are not completely melted, welding wires cannot be filled in place due to structural reasons in the later period, the linear expansion coefficients of the solid magnetic poles and the damping ring are greatly different, the inside of the solid magnetic poles is not completely welded, and the damping ring expands when a motor is started, so that open welding is easily caused; the difficulty in removing the process bolt after brazing cannot be applied again, and material waste is caused, so the existing brazing method is still to be further improved.

The invention content is as follows:

the utility model aims at providing a special support of brazing of flux core of the solid magnetic pole of synchronous motor carbon steel and red copper damping ring has reduced and has connected required part quantity, has guaranteed the assembly quality requirement. The utility model adopts the following technical scheme: a flux-cored brazing special bracket for a carbon steel solid magnetic pole and a red copper damping ring of a synchronous motor is characterized in that a plurality of I-shaped steels and steel plates form a four-corner platform (7) which is firmly connected in a welding mode, an integral forging piece is adopted to process a supporting base (8), a supporting rod (12) and the carbon steel solid magnetic pole (1) have the same convex-concave structure, and the supporting rod and the carbon steel solid magnetic pole are fixed by a standard part (13); and is pressed by matching with a pressing device (11).

The four-corner platform (7) is formed by the plurality of I-shaped steels and the steel plates in a welding mode, so that the connection is stable, and the strength requirement of the whole tool device is met; the supporting base (8) is machined by adopting an integral forging piece, so that the stability and reliability are realized, and the supporting property is strong; the supporting rod (12) and the carbon steel solid magnetic pole (1) have the same convex-concave structure, and are fixed by a standard component (13); the pressing device (11) is matched for pressing, so that a good brazing fixed assembly form is provided; the contact surface of the end part of the pressing device and the red copper damping ring is made of brazing-resistant high-temperature ceramic materials, so that the pressing device can be repeatedly used.

Utility model theory of operation:

when the support is used, the support is fixed on a workshop assembly workbench through bolts and a pressing iron, a carbon steel solid magnetic pole is vertically placed on a base, a process fixing pin is reserved on the base, the carbon steel solid magnetic pole can be clamped and positioned through the bolts, and meanwhile, the carbon steel solid magnetic pole can be completely fixed on the support by adjusting the position of a support rod, so that the number of parts required for connection is reduced; when the red copper damping ring is assembled, the pressing device is used, the red copper damping ring is fixed on the bracket in an interval compression joint mode, and the brazing of the brazing joint of the carbon steel solid magnetic pole and the red copper damping ring is completed.

The utility model has the advantages that:

1) the silver-copper-zinc flux-cored brazing filler metal with the brazing flux is combined with a special brazing support, so that the two end surfaces of the carbon steel solid magnetic pole of the synchronous motor and the red copper damping ring are brazed respectively.

2) The joint of the solid magnetic pole and the damping ring after the welding wire is brazed by adopting the preset flux-cored silver-copper-zinc brazing and the filled flux-cored silver-copper-zinc brazing filler metal is adopted, so that the problems that the wettability of the brazing filler metal and a base metal is not enough, the temperature of a brazed joint rises slowly, the brazing filler metal is not melted and the joint cannot be welded through due to the fact that the brazing filler metal is coated and dipped by a brazing flux manually and is not uniform are avoided.

3) The flux-cored silver-copper-zinc brazing filler metal welding wire is adopted for filling, so that the heating time is saved, the problems that the strength of a red copper damping ring is reduced and cracks are easily caused due to the fact that the heating temperature is increased and the heating time is increased are solved, the using amount of the brazing flux is controlled, the brazing flux is less in residue, and the cleaning is convenient.

4) The bolt hole filler is used, so that the filling efficiency is improved, the brazing time is saved, and the joint quality is improved.

5) A set of stable tool support is provided for the brazing process of two end faces of the carbon steel solid magnetic pole of the synchronous motor and the red copper damping ring, the support is fixed through bolts and a pressing iron, the carbon steel solid magnetic pole can be clamped and positioned through the bolts by utilizing the process fixing pins reserved on the base, meanwhile, the carbon steel solid magnetic pole can be completely fixed on the support by adjusting the position of the supporting rod, and the number of parts required for connection is reduced.

6) When assembling red copper damping ring, use the closing device of support, it is fixed with red copper damping ring through the mode of "interval crimping", compare with the mode that directly adopts technology bolt fastening, both guaranteed the assembly requirement, also solved technology bolt and not high temperature resistant, unable used repeatedly problem.

Description of the drawings:

FIG. 1 is a schematic view of a brazing structure of a carbon steel solid magnetic pole and a red copper damping ring of a synchronous motor

FIG. 2 is a schematic view of a structure of a silver-copper-zinc solder soldering lug with a flux coating

FIG. 3 is a schematic view of the assembly structure of the special brazing support

The specific implementation mode is as follows:

the present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, a flux-cored brazing method for a carbon steel solid magnetic pole and a red copper damping ring of a synchronous motor uses silver-copper-zinc flux-cored brazing filler metal with brazing flux, combines a special brazing support, and brazes two end faces of the carbon steel solid magnetic pole and the red copper damping ring of the synchronous motor respectively, and comprises the following steps:

1) as shown in fig. 3, the carbon steel solid magnetic pole 1 is vertically placed on the base 8 beside the platform 7, the position of the support rod 12 is adjusted, and the carbon steel solid magnetic pole 1 is fixed by using a standard component 13 for fixing;

2) as shown in fig. 1, before brazing, firstly removing oil stains on the surface of the brazing area 4 by using acetone or other organic solvents, then removing an oxidation film by using tools such as a wire brush or a scraper, and finally wiping by using white cloth to remove other impurities, and immediately performing brazing work on the cleaned part, wherein the interval time is not more than 24 hours;

3) as shown in fig. 2, the silver copper zinc brazing sheet 6 with the surface covered by the coating 5 is cut according to the shape of the brazing area 4 and is preset to be filled on the brazing area 4;

4) as shown in fig. 3, the red copper damping ring 2 is placed on the upper part of the brazing area 4, the red copper damping ring 2 is fixed by using a pressing device 10, and the pressing position cannot block the filler hole 3;

5) as shown in fig. 3, the long rail 9 and the short rail 10 are mounted on the platform 7 to isolate a working area, so that the situation that an operator falls off due to difficulty in observation and accidentally injures peripheral workers due to wearing a protective device in the operation process is prevented;

6) preheating the carbon steel solid magnetic pole 1 by using flame heating, then preheating the red copper damping ring 2, and after reaching respective preheating temperature, continuously heating the carbon steel solid magnetic pole 1 to ensure that the temperature of the red copper damping ring 2 rises simultaneously, and filling at the filling hole 3 when the red copper damping ring 2 is heated to cherry red;

7) filling and brazing the flux-cored silver-copper-zinc brazing filler metal welding wire in the bolt hole 3 on the red copper damping ring, and immediately stopping heating after the joint is fully filled;

8) the brazing direction is from two sides of the magnetic pole to the middle for brazing;

9) loosening the pressing device 10 and the standard component 13 for fixing, turning over the carbon steel solid magnetic pole 1 on one surface after brazing, and then assembling and fixing again according to the method in the step 1);

10) and (3) brazing the carbon steel solid magnetic pole 1 and the brazing area 4 on the other side of the red copper damping ring 2 by adopting the method from the step 2) to the step 8).

As shown in fig. 3, a flux-cored brazing special brazing support for a carbon steel solid magnetic pole and a red copper damping ring of a synchronous motor is characterized in that a plurality of I-shaped steels and steel plates form a four-corner platform 7 in a welding mode, so that the connection is stable, and the strength requirement of the whole tool device is ensured; the supporting base 8 is machined by adopting an integral forging piece, so that the stability and reliability are realized, and the supporting property is strong; the supporting rod 12 and the carbon steel solid magnetic pole 1 have the same convex-concave structure and are fixed by a standard part 13; the pressing device 11 is matched for pressing, so that a good brazing fixed assembly form is provided; the contact surface of the end part of the pressing device and the red copper damping ring is made of brazing-resistant high-temperature ceramic materials, so that the pressing device can be repeatedly used.

Claims

1. A flux-cored brazing special bracket for a carbon steel solid magnetic pole and a red copper damping ring of a synchronous motor is characterized in that: the supporting rods (12) and the carbon steel solid magnetic poles (1) have the same convex-concave structure, and are fixedly connected through standard parts (13); and is pressed by matching with a pressing device (11).