CN117168214B - Heat exchange flat tube with fish scale-shaped surface and tube bundle composed of heat exchange flat tube - Google Patents
Heat exchange flat tube with fish scale-shaped surface and tube bundle composed of heat exchange flat tube Download PDFInfo
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- CN117168214B CN117168214B CN202311442659.8A CN202311442659A CN117168214B CN 117168214 B CN117168214 B CN 117168214B CN 202311442659 A CN202311442659 A CN 202311442659A CN 117168214 B CN117168214 B CN 117168214B
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Abstract
The invention relates to a scale-shaped surface heat exchange flat tube and a tube bundle formed by the same, which are formed by symmetrically buckling two side wall plates, wherein a spacing space is reserved between the two wall plates, the wall surface of a single side wall plate is a scale corrugated area which is uniformly distributed, a concave area is arranged between the single scale of the scale corrugated area, the concave area is a concave circular sliding transition curved surface with a certain depth formed by concave of the outline part of the single scale to the inner cavity of the flat tube, the area near the adjacent edge of the curved bending side is a smooth straight section, the smooth straight section is used for connecting with a tube plate through tube holes of the tube plate, and the distance between the two side wall plates is the inlet and outlet of a medium entering and exiting the heat exchange flat tube. The beneficial effects are that: the heat exchange flat tube with the structure is used for the dividing wall indirect surface evaporative cooler, so that the uniformity of the water film outside the plate tube, the evaporative heat transfer intensity and the heat transfer performance of the heat exchange flat tube are improved.
Description
Technical Field
The invention belongs to the field of tube plate heat exchange and cooling equipment, and relates to a heat exchange device with a heat exchange flat tube component, wherein the application environment is a low-pressure occasion for cooling fluid to near ambient temperature, such as an evaporative cooler.
Background
In the process industrial fields of petrochemical industry, chemical industry, electric power, smelting, light industry, heating ventilation and the like, a large number of materials, fluid cooling and heat transfer processes and heat exchange equipment exist; the low temperature position close to the ambient temperature is used for cooling, condensing and transferring heat, and basically the heat is released to the atmosphere; the cooling/condensing is mostly air-cooled, water-cooled, or a combination of both. The heat transfer temperature difference of low-temperature cooling and condensing is small, so that the heat exchange area of the cooling equipment is large, and the power consumption of cooling is also large. In order to reduce the engineering investment and running cost of cooling, the main research and development directions are focused on improving the heat transfer intensity outside the tube. The evaporative cooling condenser is a cold exchange device which combines a cooling tower and a cooler/condenser into a whole and utilizes the evaporation latent heat of water to realize cooling/condensation, and the heat transfer intensity is far higher than that of pure dry air cooling, and the equipment investment scale is small, so that the evaporative cooling condenser is widely used in a plurality of flow industrial fields. And with an evaporative cooling condenser, the in-line fluid can be cooled to near ambient wet bulb temperatures, which is not possible with dry air cooling.
The external heat transfer mechanism of the evaporative cooler/condenser is complex, and the external heat transfer process comprises the following steps: convection heat transfer is carried out between the pipe wall and the water film, mass transfer and heat transfer are carried out between the surface of the water film and the air, and the convection heat transfer and mass transfer are carried out on the air. Existing research and engineering practices show that the control thermal resistance of the evaporative cooler/condenser is the pipe external water film and the gas-liquid interface. The flow form, distribution and update speed of the water film outside the pipe are important factors and research hot spots for influencing heat transfer outside the pipe. Research and development in the academia and industry have focused mainly on the tube-type, tube-surface hydrophilization treatment, and reduction of the surface tension of water, with the aim of improving the uniformity of the liquid film on the outer wall surface of the tube and reducing or eliminating the dry wall phenomenon.
In the aspect of tube development, the industry develops and uses elliptic tubes, elliptic twisted tubes, plate tubes and the like on the basis of classical round tubes, and the hydrophilic treatment of the tube surfaces mainly comprises the technologies and processes of surface spraying nano materials, surface sand blasting roughness and the like.
The compactness of the plate heat transfer element is much higher than that of the tube element, and the surface corrugations of the plate element may have an effect of breaking up the boundary layer to enhance the convection heat transfer, so that the plate heat transfer element is also used in a large amount in the evaporative cooler/condenser. Typical application schemes in industry are: loose spacing bubbling corrugated plates, cross-flow bubbling corrugated plates, and the like. These products exert the characteristic advantage of high compactness of the plate heat transfer element, but do not solve the problem of uniformity of the liquid film on the corrugated surface well, so that the heat transfer strength per unit area is lower than that of the tube heat transfer element. The reason is that the corrugated plate is made of austenitic stainless steel with good plasticity and good corrosion resistance, and the surface of the corrugated plate belongs to hydrophobic surface, if the corrugated plate is changed into a rough hydrophilic surface, the corrosion resistance is reduced; if uniform membranous flow is required to be formed on the surface of the original metal, the water spraying intensity needs to be greatly improved, and the circulating water power consumption of the cooler is larger. And when the water film on the surface is thickened, the heat conduction resistance of the water film layer is increased. Therefore, the prevention of the outer wall of the tube, the improvement of the uniformity of the liquid film on the outer wall surface of the tube and the control of the thickness of the liquid film are key points of the product development of the plate heat transfer element for the evaporative cooling condenser and the technical research hot spots. In addition, the evaporation air cooling heat exchange quantity mainly transfers heat through the moisture of air outside the pipe, and the heat taken away by air temperature rise has a small proportion, so that the flow resistance of the air outside the pipe is reduced, the air flow can be increased under the same power consumption, and further the convection heat transfer energy efficiency outside the pipe is improved.
Aiming at the situations that heat flux in pipes is large in the industries of electric power, environmental protection, heating ventilation and the like, working pressure is close to normal pressure and suitable for plate-type evaporative cooling condensation, such as a plate-type evaporative cooling exhaust steam condenser, the compact characteristics of a plate-type heat transfer element are reserved by applying advanced innovative thinking and methodology, the surface for preventing water loss is generally fan-shaped by applying the characteristic transfer methodology of composite and cross-border fusion and the bionics general knowledge, and the fish scale surface and shape of fish animals in water are transplanted onto the plate-type heat transfer element to form the fish scale surface heat transfer element.
Disclosure of Invention
The invention aims to provide a heat exchange flat tube with a fish scale-shaped surface, and simultaneously provides a tube bundle composed of the heat exchange flat tube.
The technical scheme of the invention is as follows: a heat exchange flat tube with a fish scale-shaped surface is formed by connecting two side wall plates, a single side wall plate is formed by pressing, two end areas of the single side wall plate are bent, the two side wall plates are symmetrically buckled, edges of the buckling areas are aligned and butted and then welded, a spacing space is reserved between the two wall plates, the wall surface of the single side wall plate is a uniformly distributed fish scale corrugated area, the fish scale corrugated area is composed of fish scale-shaped line units which are arranged in rows, each row of fish scales is arranged in staggered mode between every two adjacent rows of fish scales, each row of fish scales are arranged side by side, the peripheral outline of each fish scale is streamline, edge lines of the outline are arc lines which are continuously connected in a multistage mode, concave areas are reserved between the single fish scales of the fish scale corrugated area, the concave areas are concave round transition curved surfaces with certain depth towards the inner cavity of the flat tube, the adjacent edge areas of the arc bending sides are smooth straight sections, the smooth straight sections are used for penetrating through tube plates to be connected with tube plates, the opposite spacing between the two side wall plates is equal to the inlet and outlet of the heat exchange flat tube.
The outer surface of the middle part of each single fish scale is flush with the outer surface of the flat tube, and the edge lines are three arc lines with the same diameter but unequal arc lengths.
Further, the concave area is provided with a corrugated supporting point for deepening the concave, the depth of the lowest position of the concave point of the corrugated supporting point from the outer surface of the flat pipe is half of the distance between smooth straight sections of the wall plates at two sides, the outline of the bottom of the corrugated supporting point is in a trapezoid table shape with rounded sharp corners, the bottom of the corrugated supporting point is inclined to the side wall at a certain inclination, and the inclined plane and the concave area are in smooth transition; when the heat exchange flat tube is pressed outwards, the corrugated supporting points corresponding to the two side wall plates are only in contact and support without welding connection, and when the heat exchange flat tube is pressed inwards, the corrugated supporting points corresponding to the two side wall plates are in contact and area welding connection.
Preferably, the cross section of the bending area is arc-shaped, and the bending radian of the arc-shaped section is 1/4 of that of a whole circle. Two or one welding lines are welded after alignment and butt joint, and two single side wall plates are respectively and independently pressed and formed by two thin plates, and an upper welding line and a lower welding line are welded after alignment and butt joint; one, namely two single side wall boards are formed by pressing a thin plate, a W-shaped bending area is formed in the middle area, folds are pressed in the length direction in the middle, two halves of the thin plate are folded in half with the folds as reference, and two opposite edges are aligned and butted to form a welding line.
The tube bundle is characterized in that the tube plates are plates for installing a plurality of heat exchange flat tubes, tube plate tube holes are arranged in parallel according to set intervals, a punching and flanging structure is adopted, the holes are in an oblong shape matched with smooth straight section areas, the smooth straight sections of the heat exchange flat tubes penetrate through the tube plate tube holes and are attached to the inner surfaces of flanging, the end surfaces of the smooth straight sections are welded and sealed with the gaps of the end surfaces of the flanging, two ends of one group of heat exchange flat tubes are respectively connected with one tube plate to form a tube bundle, the peripheries of the tube plate tube holes are sealed with connecting tube boxes, the inner cavities of the heat exchange flat tubes are medium circulation channels, the interval space between adjacent heat exchange flat tubes is set to be a box body or a channel for circulation of another heat exchange medium fluid, and the other medium fluid flows through the interval between the heat exchange flat tubes, and the medium fluid on two sides inside and outside the heat exchange flat tubes is in a staggered flowing state.
To the long condition of heat exchange flat tube, the heat exchange flat tube sets up heat exchange flat tube and supports the subassembly, contain a plurality of support bars, two backup pads, a plurality of connecting front of a garment crossbars, the support bar is arranged with the connecting front of a garment crossbars with certain interval on the length direction of heat exchange flat tube, the backup pad is established in the heat exchange flat tube outside, the support bar is arranged between adjacent heat exchange flat tube, the support bar width equals the interval of heat exchange flat tube, the length is greater than the height of heat exchange flat tube, the support bar is also connected in the outside of the heat exchange flat tube of outermost, the support bar outside sets up the backup pad, the height of backup pad is greater than the height of heat exchange flat tube, the length is equivalent with the heat exchange flat tube length, the periphery at heat exchange flat tube arc butt joint side is arranged to the connecting front of a garment crossbars, and each support bar, equal welded connection of backup pad.
Preferably, the height of the cross section of the heat exchange flat tube (the vertical distance between the upper arc section and the lower arc section) is 200-800 mm, and the thickness (the vertical distance between the smooth straight sections of the wall plates at the two sides) is 3-20 mm.
Preferably, the arc diameter of the peripheral contour line of the arc butt joint is 20-60 mm, and the depth of the scale corrugation area in the lateral wall normal direction is 0.3-2 times of the thickness of the wall surface.
The invention has the beneficial effects that: the heat exchange flat tube with the structure is applied to the dividing wall indirect surface evaporative cooler, the flow form of water flow outside the plate type heat transfer element tube is changed, the uniformity of water film outside the plate type heat transfer element tube is improved, the evaporation heat transfer intensity of unit area is further improved, and the heat transfer performance of the heat exchange flat tube is improved. The inside and the outside of the heat exchange flat tube are provided with supports, on the basis of fully playing the compactness of the plate type heat transfer element, the distance between the corrugated plates is optimally set without being controlled by the thinning rate of the corrugated forming according to the medium characteristics, the heat transfer phase state and other conditions of the use occasion of the element and the requirement of improving the efficiency, and the comprehensive performance level of the tube bundle is improved.
Drawings
FIG. 1 is a single side wall panel wall view of a heat exchange flat tube;
FIG. 2 is a schematic view in section A-A of FIG. 1;
FIG. 3 is a schematic view in section B-B of FIG. 1;
FIG. 4 is a schematic view in section C-C of FIG. 1;
FIG. 5 is a schematic view of section D-D of FIG. 1;
FIG. 6 is a partial view of the connection of smooth straight sections to a tubesheet;
FIG. 7 is a cross-sectional view of the support assembly;
fig. 8 is a schematic top view of a support assembly arrangement.
Detailed Description
As shown in the figure, the wall surface of a single side wall plate 1 is provided with uniformly distributed scale corrugated areas 1-1, concave areas are arranged between the single scales of the scale corrugated areas 1-1, the concave areas are provided with deepened corrugated supporting points 1-2, the two end areas of the single side wall plate 1 are bent into arc-shaped sections 1-3, the radian of the single side wall plate is 1/4 of a whole circle in view of the cross section, the two side wall plates are symmetrically buckled, and the arc edges are aligned and butted and then are welded with gaps (welding methods such as laser welding, argon arc welding and the like can be adopted). Two or one welding seams are formed after alignment and butt joint, namely two single side wall plates 1 are respectively and independently pressed and formed by two thin plates, and an upper welding seam and a lower welding seam are formed after alignment and butt joint; one, namely two single side wall boards 1 are formed by pressing a thin plate, a W-shaped bending area is formed in the middle area, folds are pressed in the length direction in the middle, two halves of the thin plate are folded in half based on the folds, and two opposite edges are aligned and butted to form a welding seam. The single-sided wall panel 1 is integrally molded by a mold, and is usually manufactured by flat press molding or roll forming. The mold for producing the single-sided wall plate 1 is designed and manufactured according to the plate shape. The step size (circumference) of the mold is multiplied by the length of the single side wall plate 1, and the width of the mold is matched with the width of the single side wall plate 1. The surface of the heat exchange flat tube, which is close to the edges of two ends and is in a certain length range, is smooth, and is a smooth straight section 1-4, the smooth straight section 1-4 is used for being attached and connected with a tube plate tube hole of the tube plate 2, the tube plate tube hole can be processed into a regular long round hole, the hole which is made into an irregular wave shape and changed in order to adapt to the concave-convex area of the single side wall plate 1 is not needed, the processing difficulty is reduced, the manufacturing efficiency is high, and the quality is easy to ensure. Smooth straight sections 1-4 of the two side wall plates are opposite, a space exists between the two smooth straight sections, the space is in an open state, and the formed orifice is used for medium to enter and exit the heat exchange flat tube. The length of the heat exchange flat tube is determined according to the standardized design concept and passing rules of the air cooler tube bundle size serialization, the width of the heat exchange flat tube is determined according to the optimization of the flow resistance characteristics of the corrugated surface, and the height of the heat exchange flat tube is determined according to the physical properties and the phase state of the cooling medium.
The scale corrugation on the two side wall surfaces of the heat exchange flat tube consists of scale-shaped grain units which are arranged in rows. Each row of fish scales is arranged in staggered manner with the adjacent rows of fish scales, and each row of fish scales is arranged side by side. The peripheral outline of the single fish scale corrugation is streamline, and the edge line is a plurality of sections of continuous connected arc lines, preferably three sections of arc lines with the same diameter but unequal arc lengths. The inner concave circle of the side wall inner cavity of the flat tube is transited to form an inner concave circle transition curved surface with a certain depth by the single scale profile line part, and the outer surface of the middle part of the single scale corrugation is flush with the outer surface of the flat tube.
The depth of the lowest position of the concave points of the corrugated supporting points 1-2 from the outer surface of the flat pipe is half of the distance between the smooth straight sections 1-4 of the wall plates at the two sides, the outline of the bottom of the corrugated supporting points 1-2 is in a trapezoid table shape with sharp corners rounded, the bottom of the corrugated supporting points is a slope inclined plane with a certain inclination to the side wall, and the slope and the concave area are in smooth transition. Whether the corrugated supporting points 1-2 corresponding to the two side wall plates are welded or not is determined according to the mechanical load (pressure) born by the plate pipe. And if the working pressure in the heat exchange flat tube is higher than the atmospheric pressure and is in a positive pressure working condition, the 1-2 parts of the corrugated supporting points are welded and connected by adopting a welding method such as laser welding, resistance welding and the like to form connecting points. The fusion area and the bearing capacity of the welding part are determined according to the positive pressure in the heat exchange flat tube. In the heat exchange flat tube, a symmetrical corrugated flow passage is formed by concave fish scale-shaped grain outlines on the side wall except for the supporting points; the convection heat transfer coefficient of phase change condensation and single-phase liquid cooling of the medium in the tube is far higher than that of the medium outside the tube, and the influence of the heat transfer performance in the tube on the total heat transfer performance is small and cannot be taken as a concern.
The tube bundle consisting of the heat exchange flat tubes, the tube plate 2 is a plate with a certain thickness, the length and the width of the tube plate 2 are larger than the cross section size of the heat exchange flat tubes, and a plurality of heat exchange flat tubes can be installed. Tube plate holes are arranged on the tube plate 2 according to a set interval. The tube plate tube hole adopts a punching and flanging structure, the hole is in an oblong shape (namely, holes with circular arcs at two ends and straight line form in the middle) matched with the smooth straight section 1-4 area, and the inner contour line of the flanging of the tube plate tube hole is slightly larger than the outer contour line of the cross section 1-4 of the smooth straight section of the heat exchange flat tube. Smooth straight sections 1-4 at two ends of the heat exchange flat tube penetrate through tube plate tube holes, and gaps between the end faces of the smooth straight sections 1-4 and the flanging end faces are welded and sealed. The two smooth straight sections 1-4 at two ends of a group of heat exchange flat pipes are respectively connected with a pipe plate 2 to form a pipe bundle, the wall surfaces of adjacent heat exchange flat pipes keep a certain interval distance and are not in direct contact with each other, the periphery of each pipe plate pipe hole is sealed with a connecting pipe box (the connection between the pipe plate and the pipe box belongs to the category of conventional fluid pressure-bearing equipment and is not repeated), the inner cavity of each heat exchange flat pipe is a medium circulation channel, the interval space of each adjacent heat exchange flat pipe is set to be a box body or a channel for the circulation of another heat exchange medium fluid, the other medium fluid flows through the interval of each heat exchange flat pipe, and the medium fluid at the inner side and the outer side of each heat exchange flat pipe is in a staggered flow state.
For the condition that the length of the heat exchange flat tube is longer, heat exchange flat tube support assemblies 3 are arranged between the side walls of the heat exchange flat tubes at regular intervals, and the support assemblies 3 are of grid structures. The support component 3 comprises a plurality of support bars 3-1, two support plates 3-2 and a plurality of connecting cross pieces 3-3, wherein the support bars 3-1 and the connecting cross pieces 3-3 are arranged at a certain interval in the length direction of the heat exchange flat tube, and the support plates 3-2 are arranged outside the heat exchange flat tube. And when the cross section of the tube bundle is seen, a supporting bar 3-1 with the width equal to the interval between two adjacent heat exchange flat tubes is arranged between the two adjacent heat exchange flat tubes, the length of the supporting bar 3-1 is larger than the height of the heat exchange flat tubes, and the thickness and the interval of the supporting bar 3-1 are determined according to the working pressure of the heat exchange flat tubes. The outer side of the heat exchange flat tube at the outermost side is provided with a supporting plate 3-2, and a supporting bar 3-1 is also arranged between the supporting plate 3-2 and the adjacent heat exchange flat tube; the height of the supporting plate 3-2 is larger than that of the heat exchange flat tube, the length is equal to the length of the heat exchange flat tube, and the thickness is determined according to the working pressure of the heat exchange flat tube. On the section of a support component 3, connecting front cross bars 3-3 which are equivalent to the width of the tube bundle are arranged at the two ends of the support bars 3-1, and each support bar 3-1 is welded with the connecting front cross bar 3-3; the end part of the front cross bar 3-3 is welded with the supporting plate 3-2. The supporting plate 3-2 is used as a sealing plate of the outer layer of a group of tube bundles to form a component part of a box body or a channel where the heat exchange medium fluid in the interval space of the heat exchange flat tubes is located, and the connection between the supporting plate 3-2 and other component parts formed by the box body or the channel belongs to a mature technology for forming the heat exchange box/tube, and is not repeated; the section size of the front cross bar 3-3 is determined according to the working pressure of the heat exchange flat tube.
Preferably, the width and the height of the cross section of the heat exchange flat tube are determined according to the physical property and the phase state of cooling fluid in the tube, and the height is generally 200-800 mm; the thickness is 3-20 mm. The diameter of the arc of the peripheral outline of the arc butt joint is generally 20-60 mm, and the depth of the scale corrugated area 1-1 in the lateral wall normal direction is about 0.3-2 times of the thickness of the wall surface. A plurality of heat exchange flat tubes can be arranged in the vertical direction of one tube bundle, and the number of the heat exchange flat tubes can be 2-5 according to the width of the heat exchange flat tubes, the pressure of media and other factors. The heat exchange flat tube, tube plate 2 and support component 3 are made of stainless steel metal materials which are easy to form and weld and are resistant to corrosion by air.
According to the experimental research results and experimental verification, when the spraying density is more than 0.04-0.05 kg/m.s, the water completely wets the wall surface in the circular arc area at the top of the pipe, and then moves downwards under the action of gravity in an accelerating way. If the side walls are flat wall surfaces, the water will quickly shrink into columnar flow. In the case of the bubbling cross-flow corrugated wall surface, the water is contracted into columnar flow and simultaneously flows in an acceleration way with minimum damping under the guidance of the corrugation.
The technology of the invention forms scale-shaped corrugation on the side wall surface of the heat exchange flat tube, the downward acceleration flow of water on the top surface of the heat exchange flat tube is inhibited by scale grains, and the water has two flow tendencies under the guidance of the scale profile and the convex surface: the cross section of the heat exchange flat tube disperses and flows downwards along the surface corrugation and flows sideways along the fish scale profile. Dispersion flow: because of the bulges and the bulge curvature/inclination of the surface of the flat tube fish scale, water flow disperses vertically downwards, after a certain distance, the water flow has a shrinkage trend under the combined action of tension and gravity, and before the water flow is not received as columnar flow, the water flow reaches the contour line of the next fish scale, and the next dispersed and redistributed repeated flow beat is started. Lateral flow: there are always two trends of lateral and transverse flow in the process that water flowing along the fish scale profile laterally flows forward to the connecting point of the profile line, and the curvature radius of the lines and the slope of the lines determine the inertia power component of the water flow. The fish scale lines and the raised surfaces on the side surfaces of the heat exchange flat tubes block the continuous vertical acceleration flow of water and the trend of columnar flow, and the trend of water to be received as water drops in the flowing process is limited. Repeatedly, each time water flows through one fish scale fan-shaped unit, then enters the next fish scale fan-shaped unit, and the water flows through the fish scale side wall surface of the heat exchange flat tube, so that the flow form is far better than that of the flat wall and bubbling corrugated surface.
The main heat transfer mechanism of evaporative cooling is that the air has moisture content, the heat exchange flat tube is generally horizontally arranged, spray water outside the tube vertically flows from top to bottom on the outer wall surface of the tube, and when the water flows in a vertical smooth area of the heat exchange flat tube, if the constraint inhibition of the surface shape of a runner is not present, the water is accelerated to flow downwards under the action of gravity and surface tension; if the flow is smaller, the flow is contracted into a strand-like flow under the action of tension, the surface is dry wall phenomenon, and the heat transfer outside the pipe is deteriorated; when the flow rate reaches above the critical flow rate, maintaining membranous flow and surface infiltration; after the water accelerates to flow for a certain distance under the action of gravity, the water also contracts into a strand-shaped flow; therefore, in order to fully infiltrate the surface, the spraying amount is increased, so that the water film on the upper part of the pipe is thicker; the excessively thick water film becomes a new external thermal resistance of the pipe. In order to bear pressure, the prior plate pipe is generally designed with staggered block-shaped waves or bubble-shaped waves, and the wave shapes are more than needed by mechanical bearing, but the effect of homogenizing water film flow is not achieved. The outward ripple of bubble form buckled plate pipe is protruding has reduced the air flow area, has increased air flow resistance, and the windage is big under the same consumption, and the amount of wind is little, and the outside transmission heat transfer's of pipe efficiency is not as expected, can pull away the distance between the bubble buckled plate pipe, and then increases the flow area of air to do not have the shielding of bubble in the air flue, the air flow resistance is little, but bubble buckled plate pipe surface film formation uniformity is weaker than the average wall, and the wall phenomenon is dried to the more easily emergence, can not exert evaporative cooling's efficiency, rarely uses. The fish scale-shaped grains of the array of the invention are adopted to create a surface shape basically equivalent to the flow resistance along all directions on the cross section of the heat exchange flat tube, the side wall surface of the heat exchange flat tube is divided into a plurality of flow areas by the fish scale-shaped grains, and the grains play a role in reducing the kinetic energy of water by optimizing the shapes and the sizes of the grains, so that the change amplitude of the flow velocity from top to bottom is small, and the uniformity and the speed uniformity of the water film are better than those of a block corrugated plate tube or a bubble corrugated plate tube.
Compared with bubbling corrugated plate pipes which are supported in a contact manner, the heat exchange flat pipes keep a certain distance, so that channels between the heat exchange flat pipes are widened, the air flow area is increased, and the matching performance of flow channels on two sides is good. And the supporting width of the supporting strips 3-1 between the heat exchange flat tubes is smaller than that of the bubbling, so that the ineffective area for blocking the air flow is reduced, the air flow resistance is obviously reduced, and the efficiency of air belt wet heat extraction is obviously improved. The support bars 3-1 are arranged between the heat exchange flat pipes, so that the depth and the matching performance of the flow channels at the two sides of the heat exchange flat pipes are released under the constraint of the strict control of the forming thinning amount of the corrugated plates. The corrugated shape of the surface of the heat exchange flat tube is not controlled by the internal pressure of the heat exchange flat tube any more, and the shape is changed to improve the performance.
Compared with other prior art, the heat exchange flat tube provided by the invention has the advantages that under the condition of the same spray intensity (uniform water supply), the infiltration rate of the scale-shaped surface is higher than that of loose space bubbling waves and alternate flow bubbling waves. Under the conditions of the same spraying strength and the same fan power consumption, the heat flow density of the heat exchange area of the heat exchange flat tube on the scale-shaped surface is also improved to a greater extent than that of loose space bubbling waves and alternate flow bubbling waves.
In the working occasions of low positive pressure and vacuum, the non-contact fish scale corrugated plate pipe is adopted, and the uniformity and speed uniformity of the water film and the air flow effect are good. Is particularly suitable for the evaporative cooling similar to the condensation of the exhaust steam with negative pressure.
Because the working pressure is lower, the tube plate 2 of the tube bundle can be thinner, and therefore, a tube hole structure with punched flanges can be adopted, and the tube plate 2 has the advantages of less material consumption and high manufacturing efficiency. The end part of the heat exchange flat tube is welded with the flanging end part of the tube hole, so that the welding and the assembly are easy, and the quality is easy to ensure.
The heat exchange flat pipes are not in direct contact, the heat exchange flat pipes are required to be supported at intervals of a certain length, and the support assembly 3 enables the heat exchange flat pipes to be stable. Under the condition of positive pressure working conditions, the supporting strips 3-1 of the supporting component 3 can play a role in assisting the heat exchange flat tube to bear the internal pressure by adjusting the distance. The internal pressure load of the tube bundle is transferred to the supporting strips 3-1 through the connecting front cross bars 3-3, so that the fish scale corrugated plate tube can be used for circulating water closed cooling and air conditioner refrigerant condensing occasions. The flat heat exchange tube, the tube plate 2 and the support component 3 can be manufactured in a standardized and serial batch mode. The innovative technology and the product proposal of the invention can have good use effect in the evaporation air cooling occasion.
Claims (8)
1. A scale-shaped surface heat exchange flat tube is formed by connecting two side wall plates, wherein a single side wall plate (1) is formed by compression molding, two end areas of the single side wall plate (1) are bent, the two side wall plates are symmetrically buckled, edges of bending areas are welded after being aligned and butted, and a spacing space is reserved between the two wall plates, and the heat exchange flat tube is characterized in that: the wall surface of the single-side wall plate (1) is a uniformly distributed fish scale corrugated area (1-1), the fish scale corrugated area (1-1) is composed of fish scale-shaped grain units which are arranged in rows, each row of fish scales is arranged in staggered mode with the adjacent row of fish scales, each row of fish scales is arranged side by side, the peripheral outline of each single fish scale is streamline, the edge lines of the outline are arc lines which are continuously connected in multiple sections, the concave area is formed between the single fish scales of the fish scale corrugated area (1-1), the edge line part of each single fish scale outline is concave to form a concave circular transition curved surface with a certain depth inwards towards the inner cavity of the flat tube, the area near the adjacent edge of the curved bending side is a smooth straight section (1-4), the smooth straight section (1-4) is used for being connected with the tube plate (2) through tube holes, and the opposite existing space between the two side wall plates is the inlet and outlet of the medium inlet and outlet of the heat exchange flat tube.
2. A heat exchange flat tube with a fish scale-shaped surface as claimed in claim 1, characterized in that: the outer surface of the middle part of each single fish scale is flush with the outer surface of the heat exchange flat tube, and the edge lines are three arc lines with the same diameter but unequal arc lengths.
3. A heat exchange flat tube with a fish scale-shaped surface as claimed in claim 2, characterized in that: the concave region is provided with a corrugated supporting point (1-2) which deepens the concave further, the depth of the lowest position of the corrugated supporting point (1-2) from the outer surface of the flat pipe is half of the distance between smooth straight sections (1-4) of the two side wall plates, the bottom outline of the corrugated supporting point (1-2) is in a trapezoid table shape with sharp corners rounded, the bottom is a slope inclined plane with a certain inclination to the side wall, and the inclined plane is in smooth transition with the concave region; when the heat exchange flat tube is pressed outwards, the corrugated supporting points (1-2) corresponding to the two side wall plates are only in contact supporting but not in welded connection, and when the heat exchange flat tube is pressed inwards, the corrugated supporting points (1-2) corresponding to the two side wall plates are in welded connection.
4. A heat exchange flat tube with a fish scale-shaped surface as claimed in claim 1, characterized in that: the cross section of the bending area is arc-shaped to form an arc-shaped section (1-3), and the bending radian of the arc-shaped section (1-3) is 1/4 of the whole circle.
5. A tube bundle comprising heat exchange flat tubes with fish scale shaped surfaces as claimed in claim 1, characterized in that: the tube plates (2) are plates for installing a plurality of heat exchange flat tubes, tube plate tube holes are arranged in parallel according to a set interval, a punching and flanging structure is adopted, the holes are in an oblong shape matched with the smooth straight section (1-4) area, the smooth straight sections (1-4) of the heat exchange flat tubes penetrate through the tube plate tube holes and are attached to the flanging inner surface, the end surfaces of the smooth straight sections (1-4) are welded and sealed with the flanging end surfaces in gaps, one tube plate (2) is respectively connected with the smooth straight sections (1-4) at two ends of one group of heat exchange flat tubes to form a tube bundle, the peripheries of the tube plate tube holes are sealed to form a connecting tube box, the inner cavity of each heat exchange flat tube is a medium circulation channel, the interval space of each adjacent heat exchange flat tube is provided with a box or channel for circulation of another heat exchange medium fluid, the other medium fluid flows through the interval space of each adjacent heat exchange flat tube, and medium fluid at two sides inside and outside each heat exchange flat tube is in a staggered flowing state.
6. The tube bundle comprising heat exchange flat tubes with fish scale-shaped surfaces according to claim 5, wherein the tube bundle is characterized in that: for the long condition of heat exchange flat tube, heat exchange flat tube supports subassembly (3), support subassembly (3) contain a plurality of support bars (3-1), two backup pads (3-2), a plurality of front of a garment crossbars (3-3), support bar (3-1) and front of a garment crossbars (3-3) are arranged with certain interval in the length direction of heat exchange flat tube, backup pad (3-2) are established in the heat exchange flat tube outside, support bar (3-1) are arranged between adjacent heat exchange flat tubes, support bar (3-1) width equals the interval of heat exchange flat tube, length is greater than the height of heat exchange flat tube, support bar (3-1) are also connected in the outside of the heat exchange flat tube of outermost side, this support bar (3-1) outside sets up backup pad (3-2), the height of backup pad (3-2) is greater than the height of heat exchange flat tube, length is equivalent with heat exchange flat tube length, front of a garment crossbars (3-3) are arranged in the periphery of heat exchange flat tube arc butt joint side, and all be connected with each support bar (3-1), backup pad (3-2).
7. The tube bundle comprising heat exchange flat tubes with fish scale-shaped surfaces according to claim 5, wherein the tube bundle is characterized in that: the cross section of the heat exchange flat tube has the height of 200-800 mm and the thickness of 3-20 mm.
8. The tube bundle comprising heat exchange flat tubes with fish scale-shaped surfaces according to claim 5, wherein the tube bundle is characterized in that: the bending area of the single side wall plate (1) is arc-shaped, the diameter of the arc is 20-60 mm, and the depth of the fish scale corrugated area (1-1) in the normal direction of the single side wall plate (1) is 0.3-2 times of the thickness of the wall surface.
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| CN202311442659.8A CN117168214B (en) | 2023-11-01 | 2023-11-01 | Heat exchange flat tube with fish scale-shaped surface and tube bundle composed of heat exchange flat tube |
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| CN202311442659.8A CN117168214B (en) | 2023-11-01 | 2023-11-01 | Heat exchange flat tube with fish scale-shaped surface and tube bundle composed of heat exchange flat tube |
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| CN117168214B true CN117168214B (en) | 2024-02-02 |
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| US6267177B1 (en) * | 1999-01-19 | 2001-07-31 | Calsonic Kansei Corporation | Flat tubes for use with heat exchanger and manufacturing method thereof |
| CN103644755A (en) * | 2013-11-27 | 2014-03-19 | 华南理工大学 | Heat transfer pipe and gas heat exchanger where heat transfer pipe is used |
| CN111366013A (en) * | 2018-12-26 | 2020-07-03 | 浙江盾安热工科技有限公司 | Flat pipe and heat exchanger |
| CN111912280A (en) * | 2019-05-09 | 2020-11-10 | 浙江盾安热工科技有限公司 | Flat pipe, heat exchanger and heat pump water heater |
| CN212645474U (en) * | 2020-01-16 | 2021-03-02 | 山东爱客多热能科技有限公司 | Wave-shaped heat exchange tube |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7845396B2 (en) * | 2007-07-24 | 2010-12-07 | Asia Vital Components Co., Ltd. | Heat dissipation device with coarse surface capable of intensifying heat transfer |
| CN110887396B (en) * | 2018-09-10 | 2021-03-05 | 浙江盾安热工科技有限公司 | Heat exchanger flat tube and heat exchanger with same |
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- 2023-11-01 CN CN202311442659.8A patent/CN117168214B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6267177B1 (en) * | 1999-01-19 | 2001-07-31 | Calsonic Kansei Corporation | Flat tubes for use with heat exchanger and manufacturing method thereof |
| CN103644755A (en) * | 2013-11-27 | 2014-03-19 | 华南理工大学 | Heat transfer pipe and gas heat exchanger where heat transfer pipe is used |
| CN111366013A (en) * | 2018-12-26 | 2020-07-03 | 浙江盾安热工科技有限公司 | Flat pipe and heat exchanger |
| CN111912280A (en) * | 2019-05-09 | 2020-11-10 | 浙江盾安热工科技有限公司 | Flat pipe, heat exchanger and heat pump water heater |
| CN212645474U (en) * | 2020-01-16 | 2021-03-02 | 山东爱客多热能科技有限公司 | Wave-shaped heat exchange tube |
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| CN117168214A (en) | 2023-12-05 |
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