CN104344759A - Heat exchange tube with internal left and right spiral pieces - Google Patents

Abstract

The invention discloses a heat exchange tube with internal left and right spiral pieces. According to the technical scheme, the heat exchange tube with internal left and right spiral pieces consists of a circular heat exchange tube and spiral pieces, wherein the spiral pieces consist of a plurality of left spiral pieces and right spiral pieces; the left spiral pieces and the right spiral pieces are arranged in the inner cavity of the heat exchange tube; the numbers of the left spiral pieces and the number of the right spiral pieces are increased or decreased according to the length of the heat exchange tube; the spiral pieces are 0.5-2.5 mm in thickness; gaps of 0-3 mm are formed between the outer edges of the spiral pieces and the inner surface of the heat exchange tube; the left spiral pieces are spiral plates which are twisted for 90 degrees leftwards; the right spiral pieces are spiral plates which are twisted for 90 degrees rightwards; the left spiral pieces and the right spiral pieces, which take the central line of the heat exchange tube as the axis, are arranged at equal intervals; every two adjacent spiral pieces are in opposite rotation directions and are staggered from each other for 90 degrees; the left spiral pieces and the right spiral pieces are connected in a welded manner; the left spiral pieces and the right spiral pieces are put into the inner cavity of the heat exchange tube after being welded; the end parts of the left spiral pieces and the right spiral pieces are fixed with the inner wall of the heat exchange tube through weld joints in the welded manner.

Description

The heat exchanger tube of built-in left-and-right spiral sheet

Technical field

The present invention relates to the heat-exchange apparatus such as double-tube heat exchanger and shell-and-tube heat exchanger of the industries such as medicine, chemical industry, cosmetics, beverage, the heat exchanger tube of especially built-in flight.

Background technology

Double-tube heat exchanger and shell-and-tube heat exchanger are widely used heat transmission equipments, are also highly energy-consuming equipment.At rapid industrial development, under the trend that energy day is becoming tight, improve heat exchanger efficiency and become inevitable choice.Double-tube heat exchanger and shell-and-tube heat exchanger realize exchange heat by heat exchanging pipe wall, and for meeting low cost, high efficiency needs, the normal augmentation of heat transfer mode that adopts is to achieve the goal.One method is designed by heat exchanger tube surface configuration, heat exchanger tube made bellows, bellows tube, spiral grooved tube, screwed pipe, finned tube etc. to increase heat exchange area, also makes media flow characteristic change to improve the heat transfer property of heat exchanger tube simultaneously; Another kind method places plug-in part in heat exchanger tube, as objects such as flight, spoiler, lap-ups silks, forces tube fluid to produce flow-disturbing, change media flow characteristic to improve the heat transfer property of heat exchanger tube.Though above technology has application but all exists obviously not enough.The method of heat exchanger tube surface configuration is changed by design, heat exchange area increases to some extent, also suitably mobile performance is improved, but make heat exchange tube machining technique complicated, cost of manufacture improves, and overall economic efficiency is not obvious, and shaping lightening holes easily ftractures, particularly bellows easily produces that circumferential unstability is flat collapses and axial unstability, affects service life.In heat exchanger tube, place plug-in part, but conventional plug-in part shape and structure is complicated, manufactures difficulty, and the thermograde of tube wall and tube hub position medium can not be eliminated, can not realize managing homogenizing of interior medium, augmentation of heat transfer DeGrain.

Summary of the invention

It is simple that the present invention needs the problem solved to be to provide a kind of structure, easy to manufacture, the heat exchanger tube of augmentation of heat transfer successful.

Technical scheme of the present invention is made up of circular heat exchanger tube and flight, it is characterized in that flight is made up of multiple left-hand screw sheet and right-hand screw sheet, left and right flight quantity can increase and decrease according to heat exchanger tube length, left-hand screw sheet is the spiral plate to left handed twist 90 °, and right-hand screw sheet is reverse the spiral plate of 90 ° to the right; Left and right flight is with heat exchanger tube center line for the arrangement of axis equidistant intervals, and the direction of rotation of adjacent two flights is contrary, and interlaced 90 °, be welded to connect between left and right flight; After being welded to connect between left and right flight, two cephalic pars and heat exchanger tube inwall are welded and fixed.

Outstanding feature of the present invention is the built-in left-and-right spiral sheet of heat exchanger tube, alternately rotates, constantly split, turn back, have obvious augmentation of heat transfer effect, can be used for double-tube heat exchanger and shell-and-tube heat exchanger about making medium when Bottomhole pressure.Fluid flows through each spiral element (a left-hand screw sheet or right-hand screw sheet are a spiral element) in pipe, and produce and once split, total segmentation times is N=2 ⁿ, wherein n is heat exchanger tube inside spin unit sum.Screw action due to left and right flight makes fluid produce eddy current in pipe, and fluid flows to tube wall by heat exchanger tube central authorities, more mutually alternately advances from tube wall flow direction central authorities.Fierce rotation, split and turn back, tube wall boundary film being peeled off, improves heat transfer coefficient, increase rate is 3 ~ 5 times of common heat exchanger tube, therefore can shortening heat swap time, makes heat exchanger structure miniaturization.The fierceness of fluid rotates and turns back, and eliminates the non-uniform phenomenon of Local Heat Transfer, and in pipe, on same cross section, temperature is tending towards homogenising, and fluid can be made to realize homogenizing in pipe.Not only be applicable to low viscosity fluid by the heat exchanger of built-in left and right flight heat exchanger tube manufacture, can also be used for being with solid content fluid and high viscosity fluid and for fluid at heat exchange inner reaction tube, expand the range of application of heat exchanger.Built-in left-and-right spiral chip architecture is simple, and handling ease, reduces manufacturing expense.

Accompanying drawing explanation

Fig. 1 is the heat exchange tube structure front view of built-in left-and-right spiral sheet;

Fig. 2 is the heat exchange tube structure side view of built-in left-and-right spiral sheet;

Fig. 3 is right-hand screw sheet part drawing;

Figure: 4 is left-hand screw sheet part drawings;

Fig. 5 is the A-A partial sectional view of Fig. 1;

Fig. 6 is the I portion enlarged drawing of Fig. 1;

Fig. 7 is the B-B partial sectional view of Fig. 1.

Fig. 8 is embodiment left-hand screw sheet blanking figure.

Fig. 9 is embodiment right-hand screw sheet blanking figure.

Detailed description of the invention

The present invention is by circular heat exchanger tube 3(Fig. 1) and flight form; Flight is made up of multiple left-hand screw sheet and right-hand screw sheet, and left-and-right spiral sheet quantity can according to circular heat exchanger tube length increase and decrease; Left-and-right spiral sheet thickness 0.5mm ~ 2.5mm, flight outer rim 8(Fig. 6, Fig. 1) with circular heat exchanger tube 3(Fig. 1) inner surface 7(Fig. 6) monolateral gap 0 ~ 3mm, left-and-right spiral leaf length T equals circular heat exchanger tube internal diameter D(Fig. 1, Fig. 8, Fig. 9); Left-hand screw sheet is the spiral plate to left handed twist 90 ° (Fig. 1, Fig. 4), and right-hand screw sheet is the spiral plate reversing 90 ° (Fig. 1, Fig. 3) to the right; Left and right flight is with circular heat exchanger tube center line 4(Fig. 1) be the arrangement of axis equidistant intervals, the direction of rotation of adjacent two flights is contrary, and interlaced 90 °, by weld seam 9(Fig. 5 between left and right flight) be welded to connect; Be welded to connect between left and right flight and be placed on circular heat exchanger tube 3(Fig. 1) inner chamber, two cephalic pars by weld seam 5,6(Fig. 1, Fig. 7) with circular heat exchanger tube inwall 7(Fig. 1) be welded and fixed.Media flow during work, built-in flight is motionless.

The embodiment of described left-and-right spiral sheet: external diameter Φ=34 mm, wall thickness t=2mm, circular heat exchanger tube 3(Fig. 1 of internal diameter D=30mm) the corrosion resistant plate manufacture of built-in left-and-right spiral sheet thickness 0.5mm ~ 2.5mm, the internal diameter D equaling heat exchanger tube 3 with width B (Fig. 8, Fig. 9) equals 30mm(Fig. 1); Length L(Fig. 8, Fig. 9) by flight length T=30mm(Fig. 8, Fig. 9) two ends respectively add clamping amount again and torsion extends compensation rate sum 20mm(Fig. 8, Fig. 9), meter 70mm blanking.Two (Fig. 9) of recruitment clamping plate length L, clockwise reverse 90 °, make the both ends of the surface 10 and 11 of length T=30mm mutually (Fig. 4, Fig. 9) in 90 °, then cutting processing goes out 10,11 end faces (Fig. 4, Fig. 9), left-hand screw sheet 1(Fig. 4).Equally, two (Fig. 8) of recruitment clamping plate length L, counterclockwise reverses 90 ° and makes the both ends of the surface 12 and 13 of length T=30mm mutually (Fig. 3, Fig. 8) in 90 °, then cutting processing go out 12,13 end faces (Fig. 3, Fig. 8) right-hand screw sheet 2(Fig. 3).In addition, flight also can use the method processing and manufacturings such as casting or mold pressing.The length T of machine-shaping rear left and right flight equals heat exchanger tube internal diameter D=30mm(Fig. 1, Fig. 3, Fig. 4), left and right flight outer rim 8(Fig. 6, diameter Fig. 1) is 29.5mm, with heat exchanger tube 3(Fig. 1) inner surface 7(Fig. 6) monolateral gap be 0.25mm.

Claims (1)

1. the heat exchanger tube of built-in left-and-right spiral sheet, is made up of circular heat exchanger tube and flight, it is characterized in that flight is made up of multiple left-hand screw sheet and right-hand screw sheet; Circular heat exchanger tube inner chamber places left-hand screw sheet and right-hand screw sheet, left-and-right spiral sheet quantity increases and decreases according to circular heat exchanger tube length, flight thickness 0.5mm ~ 2.5mm, the monolateral gap of the inner surface of flight outer rim and circular heat exchanger tube is 0 ~ 3mm, and left and right flight length equals circular heat exchanger tube internal diameter; Left-hand screw sheet is the spiral plate to left handed twist 90 °, and right-hand screw sheet is reverse the spiral plate of 90 ° to the right; Left and right flight is with circular heat exchanger tube center line for the arrangement of axis equidistant intervals, and the direction of rotation of adjacent two flights is contrary, and interlaced 90 °, be welded to connect between left and right flight; Be welded to connect between left and right flight and be placed on heat exchanger tube inner chamber, two cephalic pars are welded and fixed by weld seam and circular heat exchanger tube inwall.