CN104588961A - Heat exchanger three-tube plate expanding and inner leaking repairing method - Google Patents

Abstract

The invention relates to a repairing method for mechanical equipment, in particular to a heat exchanger three-tube plate expanding and inner leaking repairing method. The method includes the following steps that firstly, the distance between a tube plate at one end of an inner leaking tube and a middle tube plate is measured, and the length size of a cutter is determined; secondly, the edge of the cutter stretches into the middle tube plate by 5 mm and is locked through a positioning screw, and the cutter is connected with an electric tool cutting tube for cutting; thirdly, after the inner leaking tube is cut, the cut tube is pulled out of the cutting side; fourthly, the length of a reamer is determined according to the pulled cut tube, according to the length of the reamer, a cutting edge is 5 mm away from the side of a reamed tube plate hole, after middle tube plate holes are all reamed out by an expanding tube, the reamed tube is pulled out, and therefore three-tube plate expanding and inner leaking repairing can be completed. The repairing method has the advantages that universality is achieved, the repairing method is suitable for repairing middle tube plate expanding tubes of three-tube heat exchangers of various types; reliability is achieved, tube penetrating and expanding are conducted again after the inner leaking tube is processed through multiple processes, and no gap exists; operation is convenient, all inner leaking tubes are operated according to the (process) technology.

Description

Repair method is leaked in a kind of heat exchanger three tube plate expanded-connecting

Technical field

The present invention relates to a kind of method for maintaining of plant equipment, specifically fistulae repair method in a kind of heat exchanger three tube plate expanded-connecting.

Background technology

The heat exchanger tube sheet of current air-conditioning machine mostly is double tubesheet, i.e. a shell ring two ends welding tube sheet.Along with the exploitation of air-conditioning market new product, increasing heat exchanger has been three Tube-sheet Weldings, i.e. two single cylinder therebetween, one piece of Tube-sheet Welding.Object reduces manufacturing cost, and increase heat exchange area.But there is the defect of maintenance difficult in the heat exchanger of three tube sheets.Such as heat exchanger tube breakage is leaked in easily occurring afterwards, is difficult to change.

Interior fistulae process after three tube plate expanded-connectings, the heat exchanger tube being actually sagging plate, by after expanded joint, inside drains heat pipe and how to extract the technological problems again more renewing heat exchanger tube.Because the particularity of product structure cannot tube drawing, conventional method blocks interior fistulae hole with plug at cylindrical shell two ends tube sheet.After interior fistulae plug-hole, the heat exchange area of heat exchanger reduces, and causes energy loss.More importantly by the plug of plug-hole along with machine runs for a long time, the baffling of current between deflection plate impacts and makes plug loose or dislocation.If the plug come off falls in heat exchanger, immeasurable loss is caused to system.Therefore Rework Technics is leaked in the urgent need to inventing in a kind of heat exchanger three tube plate expanded-connecting.

Summary of the invention

The technical problem to be solved in the present invention is the defect for drain process method in existing three tube plate expanded-connectings, fistulae repair method in a kind of heat exchanger three tube plate expanded-connecting is provided, it thoroughly solves the present situation of leaking in three tube plate expanded-connectings and adopting plug plug-hole at present with both sides tube sheet, ensure that product quality, improve economic benefit.

For solving the problems of the technologies described above this, the present invention by the following technical solutions: it comprises the following steps:

(1) in, first measuring, fistulae one end tube sheet is to the spacing of sagging plate, then determines the length dimension of cutting knife;

(2), by cutoff edge put in sagging plate 5mm place, with dog screw locking, cutting knife connects electric tool Pipe Cutting and cuts;

(3), after interior fistulae cuts off, disconnected pipe is extracted from cut-out side;

(4), according to extracting disconnected pipe determination reaming length, reaming length apart from cutting with scissors out tubesheet holes side 5mm with cutting edge, after middle tubesheet holes is all cut with scissors out by expand tube, is extracted the disconnected pipe of hinge, can be completed in three tube plate expanded-connectings to leak and reprocess.

Leak Rework Technics in heat exchanger three tube plate expanded-connecting of the present invention, mainly cut off by interior fistulae, sagging plate reams and interior fistulae the operation such as to be extracted and formed.That is: first make spacing and Calibration to fistulae in determining, then at one end tube sheet face puts in cutting knife by interior draining in heat pipe pore, and fistulae in being cut off by sagging plate position by measurement size is also extracted; With the reamer substep of different size, the sagging plate cutting off tube head is reamed, heat exchanger tube swollen in intervalve plate hole is all cut with scissors out; Extract from other end tube sheet in the face of cutting with scissors disconnected pipe again; Poling expand tube after two ends tubesheet holes is clean; The operation compositions such as withstand voltage test.

Interior fistulae cut-out is the basis of Rework Technics.Fistulae shearing length in accurate is after interior fistulae is cut off, again can by the guarantee of whole for the expansion connection pipe of sagging plate ream to neither damaging sagging plate during cut-out tube head ream;

Sagging plate fraising be operation the most key and complicated in Rework Technics, object by intervalve plate hole in expanded joint fistulae cut with scissors use up to tubesheet holes.

For ensureing ream quality, the ream amount of feeding is progressive.By often kind of amount of feeding design reamer diameter and the reamer basil, then ream successively by the reamer of different size, finally extract interior fistulae poling expand tube again, complete thus in heat exchanger three tube plate expanded-connecting to leak and reprocess.

The present invention has the following advantages:

1. versatility: the sagging plate expand tube of three tubular sheet heat exchangers of various model is reprocessed

2. reliability: poling expand tube gapless again after the internal fistulae process of multiple operation

3. easy to operate: to all interior fistulaes by (operation) technological operation

Accompanying drawing explanation

Fig. 1 is three tubular sheet heat exchanger schematic diagrames

Fig. 2 is Pipe Cutting schematic diagram

Fig. 3 is fraising schematic diagram

Fig. 4 is tube drawing schematic diagram

Fig. 5 is reamer and profile

Detailed description of the invention

Below in conjunction with accompanying drawing, the invention will be further described.

As shown in Fig. 2 ~ Fig. 5, the present invention includes following steps:

1, first measure interior fistulae one end tube sheet to the spacing of sagging plate, then determine the length dimension of cutting knife;

2, cutoff edge is put in sagging plate 5mm place, with dog screw locking, cutting knife connects electric tool Pipe Cutting and cuts;

3, after interior fistulae cuts off, disconnected pipe is extracted from cut-out side;

4, according to extracting disconnected pipe determination reaming length, reaming length apart from cutting with scissors out tubesheet holes side 5mm with cutting edge, after middle tubesheet holes is all cut with scissors out by expand tube, is extracted the disconnected pipe of hinge, can be completed in three tube plate expanded-connectings to leak and reprocess.

Claims (1)

1. a fistulae repair method in heat exchanger three tube plate expanded-connecting, it comprises the following steps:

(1) in, first measuring, fistulae one end tube sheet is to the spacing of sagging plate, then determines the length dimension of cutting knife;

(2), by cutoff edge put in sagging plate 5mm place, with dog screw locking, cutting knife connects electric tool Pipe Cutting and cuts;

(3), after interior fistulae cuts off, disconnected pipe is extracted from cut-out side;

(4), according to extracting disconnected pipe determination reaming length, reaming length apart from cutting with scissors out tubesheet holes side 5mm with cutting edge, after middle tubesheet holes is all cut with scissors out by expand tube, is extracted the disconnected pipe of hinge, can be completed in three tube plate expanded-connectings to leak and reprocess.