CN112033193A - Microchannel plate heat exchanger core with flow guide area and round corner and manufacturing method thereof - Google Patents
Microchannel plate heat exchanger core with flow guide area and round corner and manufacturing method thereof Download PDFInfo
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- CN112033193A CN112033193A CN202011051712.8A CN202011051712A CN112033193A CN 112033193 A CN112033193 A CN 112033193A CN 202011051712 A CN202011051712 A CN 202011051712A CN 112033193 A CN112033193 A CN 112033193A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
- F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
- F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
- F28F3/046—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being linear, e.g. corrugations
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- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A micro-channel plate heat exchanger core with a flow guide area and a fillet and a manufacturing method thereof are formed by stacking and combining a plurality of high-temperature medium plate sheets, a plurality of low-temperature medium plate sheets and a plurality of end plates along the plate thickness direction; the upper surface of the high-temperature medium plate is provided with a high-temperature medium flow channel and a high-temperature medium flow guiding area, and the high-temperature medium flow guiding area is internally provided with a high-temperature medium flow guiding rib and a high-temperature medium collecting groove; the upper surface of the low-temperature medium plate is provided with a low-temperature medium flow channel and a low-temperature medium flow guiding area, and the low-temperature medium flow guiding area is internally provided with a low-temperature medium flow guiding rib and a low-temperature medium collecting groove. The invention has the advantages of strong heat transfer capability, lower resistance loss, uniform fluid distribution and high heat efficiency.
Description
Technical Field
The invention relates to the technical field of heat exchange devices, in particular to a microchannel plate heat exchanger core with a flow guide area and a fillet and a manufacturing method thereof.
Background
A printed circuit board heat exchanger (PCHE) belongs to the field of micro-channel plate heat exchangers, has the advantages of compact structure, high temperature resistance, high pressure resistance, safety, reliability and the like, and is widely applied to the fields of refrigeration and air conditioning, petroleum and natural gas, nuclear industry, chemical industry, power industry and the like.
The heat exchange core body is a core component of a PCHE and is formed by welding metal plate sheets after being laminated, combined and assembled. The main processes for PCHE cores include (photo) chemical etching and diffusion welding: firstly, according to a designed micro-channel structure, a plurality of micro (millimeter-scale) fluid channels are etched on the surface of a metal plate by adopting a (photo) chemical etching method, and then a plurality of metal plates which are qualified in etching are tightly stacked and assembled to form a heat exchanger core body through diffusion welding.
The most commonly used PCHE core structures at present are four: the structure comprises a Z-shaped micro-channel structure, a linear micro-channel structure, an airfoil-shaped fin structure and an S-shaped fin structure. The Z-shaped microchannel is of a microchannel structure which is bent forwards along the flow direction, and the heat transfer medium periodically changes the flow direction and washes the wall surface of the channel in the Z-shaped microchannel, so that the medium flow boundary layer is periodically interrupted and reattached, the development of a laminar bottom layer is inhibited, and the reinforced heat transfer performance is excellent. Under the conditions of equal hydraulic diameter and same parameters of heat transfer medium, the Z-shaped micro-channel is the structure with the highest heat transfer coefficient and the strongest heat transfer capacity in the four common PCHE core structures, so the Z-shaped micro-channel is most widely applied.
However, since a large number of sharp bends are arranged along the flow direction, the medium flows and separates under the action of centrifugal force at the bends when flowing in the Z-shaped microchannel, and the flow separation causes backflow at the downstream and outer bends of the inner bend of the near-wall region of the channel, thereby causing large local resistance loss. In addition, due to the lack of a reasonable flow guide area structure, a huge number of micro-channels and an asymmetric channel structure, the phenomenon of uneven distribution of fluid in the Z-shaped micro-channels is serious, and the efficiency of the Z-shaped micro-channel heat exchanger is reduced and the resistance is increased.
In conclusion, although the advantage of the Z-shaped microchannel with strong heat transfer capability is quite outstanding, the problems of large resistance loss and uneven fluid distribution are also obvious, and the problems restrict the further popularization and development of the Z-shaped microchannel structure.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a microchannel plate heat exchanger core with a flow guide area and round corners and a manufacturing method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a micro-channel plate heat exchanger core with a flow guide area and a fillet is formed by stacking and combining a plurality of high-temperature medium plates 1, a plurality of low-temperature medium plates 2 and a plurality of end plates 11 along the plate thickness direction, wherein the high-temperature medium plates 1, the low-temperature medium plates 2 and the end plates 11 are metal plates with the same length and width; the upper surface of the high-temperature medium plate 1 is provided with a high-temperature medium flow channel 3 and a high-temperature medium flow guiding area 4, and the high-temperature medium flow guiding area 4 is internally provided with a high-temperature medium flow guiding rib 5 and a high-temperature medium collecting groove 6; the upper surface of the low-temperature medium plate 2 is provided with a low-temperature medium flow channel 7 and a low-temperature medium flow guiding area 8, and the low-temperature medium flow guiding area 8 is internally provided with a low-temperature medium flow guiding rib 9 and a low-temperature medium collecting groove 10.
The high-temperature medium flow channel 3 is positioned in the middle of the upper surface of the high-temperature medium plate 1 (along the plate length direction), the high-temperature medium flow channel 3 is formed by arranging a plurality of parallel Z-shaped micro-channels at equal intervals, the turning positions of the Z-shaped micro-channels are all of smooth fillet bending structures, the width of the Z-shaped micro-channel is more than or equal to 0.2 and less than or equal to 10mm, and the turning angle of the Z-shaped micro-channel is
The curvature radius of the fillet at the bending part of the Z-shaped micro-channel is 0<r is less than or equal to 10d, the length of the straight-line segment of the Z-shaped micro-channel is less than or equal to 2d and less than or equal to l and less than or equal to 50d, the total length, the number and the depth of the Z-shaped micro-channel are determined by thermal computation, and the space between the Z-shaped micro-channels is determined by intensity computation.
The high-temperature medium flow guide area 4 is positioned at the end part of the upper surface of the high-temperature medium plate 1 (along the plate length direction), the high-temperature medium flow guide area 4 comprises two trapezoidal grooves at two ends of the plate, the two trapezoidal grooves respectively extend from the two ends of the plate to the middle part of the plate to be connected with two ends of the high-temperature medium flow channel 3, the depth of each trapezoidal groove is equal to that of the high-temperature medium flow channel 3, the length a and the height b of the upper bottom of each trapezoidal groove are determined by thermodynamic calculation, and the included angle between the two waist parts of each trapezoidal groove is 0< alpha <90 degrees; the high-temperature medium flow guide area 4 is internally provided with high-temperature medium flow guide fins 5 and high-temperature medium collection grooves 6, the high-temperature medium flow guide fins 5 are arranged in rows at equal included angles along the flow direction, the high-temperature medium collection grooves 6 are arranged in rows at equal intervals perpendicular to the flow direction, and each row of high-temperature medium flow guide fins 5 is disconnected at the position of each high-temperature medium collection groove 6; the height of the high-temperature medium flow guiding rib 5 is equal to the depth of the high-temperature medium flow channel 3, the length, the width and the number of columns of the high-temperature medium flow guiding rib are determined by thermodynamic calculation and intensity calculation, and the width, the depth and the number of rows of the high-temperature medium collecting groove 6 are determined by thermodynamic calculation and intensity calculation.
The low-temperature medium flow channel 7 is located in the middle of the upper surface of the low-temperature medium plate 2 (along the plate length direction), the low-temperature medium flow channel 7 is formed by arranging a plurality of parallel Z-shaped micro-channels at equal intervals, the turning positions of the Z-shaped micro-channels are all of smooth fillet bending structures, the width of each Z-shaped micro-channel is not less than 0.2 and not more than 10mm, the turning angle of each Z-shaped micro-channel is not less than 0 and not more than 180 degrees, the curvature radius of each fillet at the bending position of each Z-shaped micro-channel is not less than 0 and not more than 10 degrees, the length of each straight line segment of each Z-shaped micro-channel is not less than 2D and not more than 50D, the total length, the number and the depth of the.
The low-temperature medium diversion area 8 is positioned at the end part of the upper surface of the low-temperature medium plate 2 (along the plate length direction), the low-temperature medium diversion area 8 comprises two trapezoidal grooves at two ends of the plate, the two trapezoidal grooves respectively extend from the two ends of the plate to the middle part of the plate to be connected with two ends of the low-temperature medium flow channel 7, the depth of the trapezoidal groove is equal to that of the low-temperature medium flow channel 7, the length c and the height e of the upper bottom of the trapezoidal groove are determined by thermodynamic calculation, and the included angle between the two waist parts of the trapezoidal groove is 0< beta <90 degrees; the low-temperature medium diversion area 8 is internally provided with low-temperature medium diversion fins 9 and low-temperature medium collection grooves 10, the low-temperature medium diversion fins 9 are arranged in rows along the flow direction at equal included angles, the low-temperature medium collection grooves 10 are arranged in rows at equal intervals perpendicular to the flow direction, and the low-temperature medium diversion fins 9 in each row are disconnected at the position of each row of the low-temperature medium collection grooves 10; the height of the low-temperature medium flow guiding rib 9 is equal to the depth of the low-temperature medium flow channel 7, the length, the width and the number of lines of the low-temperature medium flow guiding rib are determined by thermodynamic calculation and intensity calculation, and the width, the depth and the number of lines of the low-temperature medium collecting groove 10 are determined by thermodynamic calculation and intensity calculation.
The two trapezoidal grooves of the high-temperature medium flow guide region 4 are arranged on the same side of the plate 1 or in a diagonal direction; the two trapezoidal grooves of the low-temperature medium flow guide region 8 are arranged on the same side of the plate 2 or in a diagonal direction.
One or more low-temperature medium plates 2 are arranged between the adjacent pair of high-temperature medium plates 1; one or more high-temperature medium plates 1 are arranged between the adjacent pair of low-temperature medium plates 2.
The cross sections of the high-temperature medium flow passage 3 and the low-temperature medium flow passage 7 are any one of triangular, trapezoidal, rectangular, semicircular, semi-elliptical and U-shaped.
The high-temperature medium flow channel 3 and the low-temperature medium flow channel 7 are arranged in parallel or vertically.
A manufacturing method of a micro-channel plate heat exchanger core with a flow guide area and a fillet comprises the following steps:
step 1: cutting according to the designed specification size to obtain a metal plate;
step 2: cleaning stains on the surface of the metal sheet by adopting methods such as organic solvent cleaning, alkaline chemical cleaning, acid chemical cleaning and the like to obtain a clean metal sheet;
and step 3: copying the designed flow guide area and the Z-shaped micro-channel structure with the fillet to the surface of a clean metal plate by using an anti-corrosion technology to form an anti-corrosion layer, protecting the metal surface which does not need to be processed by corrosion, only exposing the surface to be processed to obtain the metal plate attached with the anti-corrosion layer, wherein the anti-corrosion technology comprises photoetching, silk-screen printing, pad printing, anti-corrosion and laser photoetching;
and 4, step 4: preparing a corrosive agent, namely pressurizing and atomizing the corrosive agent to be sprayed to the surface of the metal sheet attached with the anti-corrosion layer, and corroding and processing the designed flow guide area and the Z-shaped micro-channel structure with the fillet on the surface of the sheet to obtain the etched sheet attached with the anti-corrosion layer;
and 5: after the plate is qualified by etching, removing the anti-corrosion layer on the surface of the plate by using a solvent, alkali liquor or other cleaning agents to obtain an etched plate;
step 6: stacking, assembling and fastening the end plate and the etching plate according to the requirements of an assembly drawing to obtain an assembly part;
and 7: and placing the assembly part into a furnace body of vacuum diffusion welding equipment, heating and pressurizing, and performing solid-state bonding on the contact surface of the plate sheet through atomic diffusion at high temperature and high pressure to obtain a solid block body which comprises a flow guide area and a Z-shaped micro channel with a fillet, namely the heat exchanger core body.
The material of the metal sheet in the step 1 is determined by process design.
And 4, the key process parameters of the corrosion processing process in the step 4 comprise corrosive agent components, corrosive agent concentration, corrosion temperature and etching time, and the process parameters are determined according to the material and specification of the metal sheet and the structures and the sizes of the flow guide area and the flow channel on the sheet.
And 7, the key process parameters of the vacuum diffusion welding process in the step 7 comprise welding time, welding temperature and welding pressure, and the process parameters are determined according to the material and specification of the metal sheet and the structures and the sizes of the flow guide area and the flow channel on the sheet.
The invention has the beneficial effects that:
(1) the heat transfer capability is strong. The invention adopts a Z-shaped micro-channel heat transfer core body structure with a fillet, the small channel hydraulic diameter, the periodic scouring of a medium to a wall surface in the channel and the secondary flow caused by centrifugal force all have obvious enhanced heat transfer effects, and the fillet structure at the bent part has very limited inhibiting effect on the secondary flow, so the heat transfer capacity of the heat exchange core body provided by the invention is similar to the heat transfer capacity of the Z-shaped channel with the sharp break angle, and the heat transfer coefficient of the heat exchange core body is reduced by not more than 8 percent compared with the Z-shaped channel with the sharp break angle through calculation.
(2) The drag loss is low. The flow guide area structure provided by the invention can promote the uniform distribution of fluid media in a plurality of micro-channels, and reduce the resistance rise caused by the nonuniform distribution of fluid. The fillet bending structure provided by the invention effectively inhibits the development of the flow separation area, obviously reduces the area of the backflow area at the bending part, greatly reduces the local resistance caused by backflow, and is found by calculation that the resistance loss can be reduced by 20-50% compared with a sharp-break-angle Z-shaped channel.
(3) The fluid is evenly distributed. The flow guide area provided by the invention is divided into a plurality of block-shaped areas by the discontinuous flow guide ribs and the continuous collecting grooves, the flow guide area designed in the way has no flow dead zone and has better functions of flow guide and uniform fluid distribution, and the flow guide areas are arranged at the two ends of the plate sheet to ensure that the distribution of fluid media in each micro-channel is more uniform.
(4) The thermal efficiency is high. The flow guide area improves the uniformity of fluid medium distribution, inhibits the loss of heat efficiency caused by uneven fluid distribution, and the heat efficiency of the invention can be improved by 0.5-3% compared with the core body structure of the heat exchanger without the flow guide area.
Drawings
Fig. 1 is an assembly schematic of the present invention.
Fig. 2 is a structural dimension diagram of a microchannel of a high-temperature medium flow channel 3 according to the invention.
Fig. 3 is a structural dimension diagram of the high temperature medium flow guiding region 4 of the present invention.
Fig. 4 is a structural dimension diagram of a microchannel of the low-temperature medium flow channel 7 of the invention.
Fig. 5 is a structural size diagram of the low-temperature medium flow guiding region 8 of the invention.
Fig. 6 is a view of the finished heat exchanger core profile of the present invention.
Wherein, 1 is a high-temperature medium plate, 2 is a low-temperature medium plate, 3 is a high-temperature medium flow channel, 4 is a high-temperature medium flow guiding zone, 5 is a high-temperature medium flow guiding rib, 6 is a high-temperature medium collecting groove, 7 is a low-temperature medium flow channel, 8 is a low-temperature medium flow guiding zone, 9 is a low-temperature medium flow guiding rib, 10 is a low-temperature medium collecting groove, and 11 is an end plate.
Detailed Description
The present invention will be described in further detail with reference to examples.
As shown in fig. 1: a micro-channel plate heat exchanger core with a flow guide area and a fillet is formed by stacking and combining a plurality of high-temperature medium plates 1, a plurality of low-temperature medium plates 2 and a plurality of end plates 11 along the plate thickness direction, wherein the high-temperature medium plates 1, the low-temperature medium plates 2 and the end plates 11 are metal plates with the same length and width; the upper surface of the high-temperature medium plate 1 is provided with a high-temperature medium flow channel 3 and a high-temperature medium flow guiding area 4, and the high-temperature medium flow guiding area 4 is internally provided with a high-temperature medium flow guiding rib 5 and a high-temperature medium collecting groove 6; the upper surface of the low-temperature medium plate 2 is provided with a low-temperature medium flow channel 7 and a low-temperature medium flow guiding area 8, and the low-temperature medium flow guiding area 8 is internally provided with a low-temperature medium flow guiding rib 9 and a low-temperature medium collecting groove 10.
The end plates 11 are located at the upper and lower ends, and more end plates may be arranged at positions other than the upper and lower ends according to process requirements.
As shown in fig. 2: the high-temperature medium flow channel 3 is positioned in the middle of the upper surface of the high-temperature medium plate 1 (along the plate length direction), the high-temperature medium flow channel 3 is formed by arranging a plurality of parallel Z-shaped micro-channels at equal intervals, the turning positions of the Z-shaped micro-channels are all of smooth fillet bending structures, the width d of each micro-channel is more than or equal to 0.2 and less than or equal to 10mm, and the turning angle of each micro-channel is
The larger the turning angle is, the stronger the heat transfer is and the larger the resistance is, and the curvature radius of the fillet at the bending part of the micro-channel is 0<r is less than or equal to 10d, the curvature radius is increased, the heat transfer capacity is weakened, the resistance loss is reduced, the length of a straight-line section of the micro-channel is 2d or less than or equal to l or less than or equal to 50d, the larger the length of the straight-line section is, the more easily the section of fluid can reach a fully developed state, the total length, the number and the depth of the micro-channel are determined by thermal calculation, the spacing of the micro-channel is determined by strength calculation, and the larger the.
As shown in fig. 3: the high-temperature medium diversion area 4 comprises two trapezoidal grooves at two ends of the plate, the two trapezoidal grooves respectively extend from the two ends of the plate to the middle of the plate to be connected with two ends of the high-temperature medium flow channel 3, the depth of the trapezoidal grooves is equal to that of the high-temperature medium flow channel 3, the length a and the height b of the upper bottom of each trapezoidal groove are determined by thermodynamic calculation, the included angle between the two waist sides of each trapezoidal groove is 0< alpha <90 degrees, and the diversion area is poor in fluid distribution uniformity when the included angle is larger; the high-temperature medium flow guide area 4 is internally provided with high-temperature medium flow guide fins 5 and high-temperature medium collection grooves 6, the high-temperature medium flow guide fins 5 are arranged in rows at equal included angles along the flow direction, the high-temperature medium collection grooves 6 are arranged in rows at equal intervals perpendicular to the flow direction, and each row of high-temperature medium flow guide fins 5 is disconnected at the position of each high-temperature medium collection groove 6; the height of the high-temperature medium flow guiding rib 5 is equal to the depth of the high-temperature medium flow channel 3, the length, the width and the number of columns are determined by thermodynamic calculation and strength calculation, the number of columns is increased, the fluid distribution uniformity is improved, but the resistance and the processing cost are increased, the width, the depth and the number of rows of the high-temperature medium collecting groove 6 are determined by thermodynamic calculation and strength calculation, and the more the number of rows, the more the fluid distribution is uniform, the more the resistance and the processing cost are increased.
As shown in fig. 4: the low-temperature medium flow channel 7 is positioned in the middle of the upper surface of the low-temperature medium plate 2 (along the plate length direction), the low-temperature medium flow channel 7 is formed by a plurality of parallel Z-shaped micro-channels which are arranged in parallel at equal intervals, the turning parts of the Z-shaped microchannels are all of smooth fillet bending structures, the width of each microchannel is 0.2-10 mm, the turning angle of each microchannel is 0-180 degrees, the larger the turning angle is, the stronger the heat transfer is, the larger the resistance is, the radius of curvature of the fillet at the bending part of each microchannel is 0< R < 10D, the larger the radius of curvature is, the heat transfer capacity is weakened, the resistance loss is reduced, the length of the straight line section of each microchannel is 2D-50D, the larger the length of the straight line section is, the more easily the section of fluid reaches a fully developed state, the total length, the number and the depth of the microchannels are determined by thermal calculation, the spacing of the microchannels is determined by strength calculation, and the larger the spacing is, the higher the strength is.
As shown in fig. 5: the low-temperature medium diversion area 8 is positioned at the end part of the upper surface of the low-temperature medium plate 2 (along the plate length direction), the low-temperature medium diversion area 8 comprises two trapezoidal grooves at two ends of the plate, the two trapezoidal grooves respectively extend from the two ends of the plate to the middle part of the plate to be connected with two ends of the low-temperature medium flow channel 7, the depth of the trapezoidal groove is equal to the depth of the low-temperature medium flow channel 7, the length c and the height e of the upper bottom of the trapezoidal groove are determined by thermodynamic calculation, the included angle between the two waist parts of the trapezoidal groove is 0< beta <90 degrees, and the bigger included angle is, the worse the uniformity; the low-temperature medium diversion area 8 is internally provided with low-temperature medium diversion fins 9 and low-temperature medium collection grooves 10, the low-temperature medium diversion fins 9 are arranged in rows along the flow direction at equal included angles, the low-temperature medium collection grooves 10 are arranged in rows at equal intervals perpendicular to the flow direction, and the low-temperature medium diversion fins 9 in each row are disconnected at the position of each row of the low-temperature medium collection grooves 10; the height of the low-temperature medium flow guiding rib 9 is equal to the depth of the low-temperature medium flow channel 7, the length, the width and the number of columns are determined by thermodynamic calculation and strength calculation, the number of columns is increased, the fluid distribution uniformity is improved, but the resistance and the processing cost are increased, the width, the depth and the number of rows of the low-temperature medium collecting groove 10 are determined by thermodynamic calculation and strength calculation, and the more the number of rows, the more the fluid distribution is uniform, the more the resistance and the processing cost are increased.
The two trapezoidal grooves of the high-temperature medium flow guide region 4 can be arranged on the same side or in a diagonal direction on the plate sheet 1; the two trapezoidal grooves of the low-temperature medium flow guide region 8 can be arranged on the same side or in a diagonal direction on the plate 2.
One or more low-temperature medium plates 2 can be arranged between the adjacent pair of high-temperature medium plates 1, and the larger the number of the plates is, the larger the flow area is, and the lower the flow speed is; one or more high-temperature medium plates 1 can be arranged between the adjacent pair of low-temperature medium plates 2, and the larger the number of the plates is, the larger the flow area is, and the lower the flow speed is.
The cross sections of the high-temperature medium flow passage 3 and the low-temperature medium flow passage 7 are any one of triangular, trapezoidal, rectangular, semicircular, semi-elliptical and U-shaped.
The high-temperature medium flow channel 3 and the low-temperature medium flow channel 7 can be arranged in parallel or vertically, and the corresponding medium heat exchange type is forward, reverse or cross flow.
As shown in fig. 6: a manufacturing method of a micro-channel plate heat exchanger core with a flow guide area and a fillet comprises the following steps:
step 1: cutting according to the designed specification size to obtain a metal plate;
step 2: cleaning stains on the surface of the metal sheet by adopting methods such as organic solvent cleaning, alkaline chemical cleaning, acid chemical cleaning and the like to obtain a clean metal sheet;
and step 3: copying the designed flow guide area and the Z-shaped micro-channel structure with the fillet to the surface of a clean metal plate by using an anti-corrosion technology to form an anti-corrosion layer to obtain the metal plate attached with the anti-corrosion layer, wherein the anti-corrosion technology comprises photoetching, silk-screen printing, pad printing, laser photoetching and the like;
and 4, step 4: preparing a corrosive agent, namely pressurizing and atomizing the corrosive agent to be sprayed to the surface of the metal sheet attached with the anti-corrosion layer, and corroding and processing the designed flow guide area and the Z-shaped micro-channel structure with the fillet on the surface of the sheet to obtain the etched sheet attached with the anti-corrosion layer;
and 5: after the plate is qualified by etching, removing the anti-corrosion layer on the surface of the plate by using a solvent, alkali liquor or other cleaning agents to obtain an etched plate;
step 6: stacking, assembling and fastening the end plate and the etching plate according to the requirements of an assembly drawing to obtain an assembly part;
and 7: and placing the assembly part into a furnace body of vacuum diffusion welding equipment, heating and pressurizing, and performing solid-state bonding on the contact surface of the plate sheet through atomic diffusion at high temperature and high pressure to obtain a solid block body which comprises a flow guide area and a Z-shaped micro channel with a fillet, namely the heat exchanger core body.
The material of the metal sheet in the step 1 is determined by process design.
And 4, the key process parameters of the corrosion processing process in the step 4 comprise corrosive agent components, corrosive agent concentration, corrosion temperature and etching time, and the process parameters are determined according to the material and specification of the metal sheet and the structures and the sizes of the flow guide area and the flow channel on the sheet.
And 7, the key process parameters of the vacuum diffusion welding process in the step 7 comprise welding time, welding temperature and welding pressure, and the process parameters are determined according to the material and specification of the metal sheet and the structures and the sizes of the flow guide area and the flow channel on the sheet.
Example (b):
cutting a 316 stainless steel plate with the thickness of 3mm into 12 sheets with the thickness of 280mm multiplied by 150mm, and cutting a 316 stainless steel plate with the thickness of 10mm into 2 sheets with the thickness of 280mm multiplied by 150 mm; cleaning the surface of the 14 metal plates by using a WP-760 cleaning agent; copying the designed flow guide area and flow channel structure to the upper surface of 12 metal plates by adopting a photoetching anticorrosion technology to form an anticorrosion layer with a specific structure, wherein the main component of the anticorrosion layer is pentaerythritol triacrylate polymer; 100 g of FeCl3Dissolving the crystal in 300 ml concentrated hydrochloric acid, diluting with 1200 ml water to obtain iron trichloride etchant, placing 12 sheets with anti-corrosion layer on the conveyer belt of etching machine, and using acid-resisting pump to trichloroThe iron corrosive agent is pressurized and sprayed on the surface of the plate, and the designed flow guide area and flow channel structure can be etched on the surface of the plate after 80 minutes at the temperature of 55 ℃; after the etching of the plate is checked and determined to be qualified, spraying 5% NaOH solution onto the surface of the plate, and removing the anti-corrosion layer on the surface of the plate at the temperature of 60 ℃ for 120 seconds to obtain an etched plate; the 12 etched plates 1 and 2 are stacked alternately in the height direction, the end plate 11 is placed on the top and bottom, and the 14 plates are positioned, aligned, compacted, stuck and fastened to obtain an assembly as shown in fig. 1; and (3) placing the assembly part into a furnace body of vacuum diffusion welding equipment, welding for 4 hours at 880 ℃ under 10MPa to realize the diffusion of atoms and the migration of crystal boundary at the interface of the plate, and finishing the processing of the heat exchanger core body as shown in figure 6.
The micro-channel plate heat exchanger core body with the flow guide area and the fillet, which is processed according to the steps, is a porous metal rectangular block body with the thickness of 280mm multiplied by 150mm multiplied by 56mm, the total length of the high-temperature medium flow channel 3 is 200mm, the width of the high-temperature medium flow channel is 121mm, the cross section of the micro-channel is a semicircle with the diameter of 2mm, the distance between the micro-channels is 5mm, d is 2mm, l is 13mm, r is 1mm, and,
Two trapezoidal grooves of the high-temperature medium flow guiding area 4 are arranged in a diagonal direction, the depth of the trapezoidal grooves is 1mm, a is 50mm, b is 40mm, alpha is 60 degrees, the high-temperature medium flow guiding fins 5 are 1mm high, 4mm wide and are arranged in three rows, the included angle between the rows is 15 degrees, the high-temperature medium collecting groove 6 is 1mm deep, 3mm wide and is arranged in three rows, the row spacing is 10mm, the total length of the low-temperature medium flow channel 7 is 200mm, the width of the low-temperature medium flow channel is 121mm, the cross section of a microchannel of the low-temperature medium flow guiding area is a semicircle with the diameter of 2mm, the microchannel spacing is 5mm, D is 2mm, L is 14mm, R is 1mm, theta is 90 degrees, the two trapezoidal grooves of the low-temperature medium flow guiding area 8 are arranged in a diagonal direction, the depth of the trapezoidal grooves is 1mm, c is 50mm, e is 40mm, beta is 60 degrees, the low-temperature medium flow guiding fins 9 are 1mm high, the width of 4mm, the width of the low-temperature medium flow guiding areas are arranged, 3mm wide, arranged in three rows with a row spacing of 10 mm. A low-temperature medium plate 2 is arranged between a pair of adjacent high-temperature medium plates 1, and a high medium plate is arranged between a pair of adjacent low-temperature medium plates 2The temperature medium plate 1, the high temperature medium flow channel 3 and the low temperature medium flow channel 7 are arranged in parallel, the high temperature medium flows in from the upper left corner and flows out from the lower right corner of the plate 1, the low temperature medium flows in from the upper right corner and flows out from the lower left corner of the plate 2, and the high temperature medium and the low temperature medium exchange heat in a countercurrent mode.
Claims (10)
1. A microchannel plate heat exchanger core with a flow guide area and a fillet is formed by stacking and combining a plurality of high-temperature medium plates (1), a plurality of low-temperature medium plates (2) and a plurality of end plates (11) along the plate thickness direction, wherein the high-temperature medium plates (1), the low-temperature medium plates (2) and the end plates (11) are metal plates with the same length and width; the upper surface of the high-temperature medium plate (1) is provided with a high-temperature medium flow channel (3) and a high-temperature medium flow guide area (4), and the high-temperature medium flow guide area (4) is internally provided with a high-temperature medium flow guide rib (5) and a high-temperature medium collection groove (6); the upper surface of the low-temperature medium plate (2) is provided with a low-temperature medium flow channel (7) and a low-temperature medium flow guide area (8), and the low-temperature medium flow guide area (8) is internally provided with a low-temperature medium flow guide rib (9) and a low-temperature medium collection groove (10).
2. The micro-channel plate heat exchanger core with the flow guide area and the round angle as claimed in claim 1, wherein the high temperature medium flow channel (3) is located in the middle position (along the plate length direction) of the upper surface of the high temperature medium plate (1), the high temperature medium flow channel (3) is composed of a plurality of parallel Z-shaped micro-channels which are arranged in parallel at equal intervals, the turning positions of the Z-shaped micro-channels are all smooth round angle bending structures, the width of the Z-shaped micro-channel is 0.2-d and 10-mm, the turning angle of the Z-shaped micro-channel is 0-phi and 180-phi, the curvature radius of the round angle at the bending position of the Z-shaped micro-channel is 0< r and 10-d, and the length of the straight line section of the Z-shaped micro-channel is 2d and l and.
3. The micro-channel plate heat exchanger core with the flow guide areas and the round corners as claimed in claim 1, wherein the high temperature medium flow guide area (4) is located at the end position of the upper surface of the high temperature medium plate (1), the high temperature medium flow guide area (4) comprises two trapezoidal grooves at two ends of the plate, the two trapezoidal grooves respectively extend from two ends of the plate to the middle of the plate to be connected with two ends of the high temperature medium flow channel (3), the depth of the trapezoidal groove is equal to the depth of the high temperature medium flow channel (3), the length a and the height b of the upper bottom of the trapezoidal groove are determined by thermodynamic calculation, and the included angle between two sides of the trapezoidal groove is 0< alpha <90 degrees;
high-temperature medium flow guide fins (5) and high-temperature medium collection grooves (6) are arranged in the high-temperature medium flow guide area (4), the high-temperature medium flow guide fins (5) are arranged in rows at equal included angles along the flow direction, the high-temperature medium collection grooves (6) are arranged in rows at equal intervals perpendicular to the flow direction, and the high-temperature medium flow guide fins (5) in each row are disconnected at the position of each high-temperature medium collection groove (6); the height of the high-temperature medium flow guiding rib (5) is equal to the depth of the high-temperature medium flow channel (3).
4. The micro-channel plate heat exchanger core with the flow guide area and the round angle as claimed in claim 1, wherein the low temperature medium flow channel (7) is located in the middle of the upper surface of the low temperature medium plate (2), the low temperature medium flow channel (7) is composed of a plurality of parallel Z-shaped micro-channels which are arranged in parallel at equal intervals, the turning positions of the Z-shaped micro-channels are all of smooth round angle bending structures, the width of the Z-shaped micro-channel is 0.2-10 mm, the turning angle of the Z-shaped micro-channel is 0-180 degrees, the curvature radius of the round angle of the bending position of the Z-shaped micro-channel is 0< R-10D, and the length of the straight line section of the Z-shaped micro-channel is 2D-L-50D.
5. The micro-channel plate heat exchanger core with the flow guide areas and the round corners as claimed in claim 1, wherein the low temperature medium flow guide area (8) is located at the end position of the upper surface of the low temperature medium plate (2), the low temperature medium flow guide area (8) comprises two trapezoidal grooves at two ends of the plate, the two trapezoidal grooves respectively extend from two ends of the plate to the middle of the plate to be connected with two ends of the low temperature medium flow channel (7), the depth of the trapezoidal groove is equal to the depth of the low temperature medium flow channel (7), and the included angle between two waist parts of the trapezoidal groove is 0< beta <90 °;
the low-temperature medium diversion area (8) is internally provided with low-temperature medium diversion fins (9) and low-temperature medium collection grooves (10), the low-temperature medium diversion fins (9) are arranged in rows at equal included angles along the flowing direction, the low-temperature medium collection grooves (10) are arranged in rows at equal intervals perpendicular to the flowing direction, and the low-temperature medium diversion fins (9) in each row are disconnected at the position of each row of the low-temperature medium collection grooves (10); the height of the low-temperature medium flow guiding rib (9) is equal to the depth of the low-temperature medium flow channel (7).
6. The micro-channel plate heat exchanger core with flow guiding areas and round corners as claimed in claim 1, characterized in that the two trapezoidal grooves of the high temperature medium flow guiding area (4) are arranged on the same side or in diagonal direction on the plate (1); the two trapezoidal grooves of the low-temperature medium flow guide area (8) are arranged on the same side of the plate (2) or in a diagonal direction.
7. The micro-channel plate heat exchanger core with flow guiding areas and round corners according to claim 1, characterized in that one or more low temperature medium plates (2) are arranged between the adjacent pair of high temperature medium plates (1); one or more high-temperature medium plates (1) are arranged between the adjacent pair of low-temperature medium plates (2).
8. The micro-channel plate heat exchanger core with flow guiding areas and round corners of claim 1, wherein the cross-sectional shapes of the high temperature medium flow channels (3) and the low temperature medium flow channels (7) are any one of triangle, trapezoid, rectangle, semicircle, semiellipse and U-shape.
9. A microchannel plate heat exchanger core with flow guiding areas and rounded corners according to claim 1, wherein the high temperature medium flow channels (3) and the low temperature medium flow channels (7) are arranged parallel or perpendicular to each other.
10. The manufacturing method of the micro-channel plate heat exchanger core with the flow guide areas and the round corners is characterized by comprising the following steps:
step 1: cutting according to the designed specification size to obtain a metal plate;
step 2: cleaning stains on the surface of the metal sheet by adopting methods such as organic solvent cleaning, alkaline chemical cleaning, acid chemical cleaning and the like to obtain a clean metal sheet;
and step 3: copying the designed flow guide area and the Z-shaped micro-channel structure with the fillet to the surface of a clean metal plate by using an anti-corrosion technology to form an anti-corrosion layer to obtain the metal plate attached with the anti-corrosion layer, wherein the anti-corrosion technology comprises photoetching, silk-screen printing, pad printing, laser photoetching and the like;
and 4, step 4: preparing a corrosive agent, namely pressurizing and atomizing the corrosive agent to be sprayed to the surface of the metal sheet attached with the anti-corrosion layer, and corroding and processing the designed flow guide area and the Z-shaped micro-channel structure with the fillet on the surface of the sheet to obtain the etched sheet attached with the anti-corrosion layer;
and 5: after the plate is qualified by etching, removing the anti-corrosion layer on the surface of the plate by using a solvent, alkali liquor or other cleaning agents to obtain an etched plate;
step 6: stacking, assembling and fastening the end plate and the etching plate according to the requirements of an assembly drawing to obtain an assembly part;
and 7: and placing the assembly part into a furnace body of vacuum diffusion welding equipment, heating and pressurizing, and performing solid-state bonding on the contact surface of the plate sheet through atomic diffusion at high temperature and high pressure to obtain a solid block body which comprises a flow guide area and a Z-shaped micro channel with a fillet, namely the heat exchanger core body.
The material of the metal sheet in the step 1 is determined by process design.
And 4, the key process parameters of the corrosion processing process in the step 4 comprise corrosive agent components, corrosive agent concentration, corrosion temperature and etching time, and the process parameters are determined according to the material and specification of the metal sheet and the structures and the sizes of the flow guide area and the flow channel on the sheet.
And 7, the key process parameters of the vacuum diffusion welding process in the step 7 comprise welding time, welding temperature and welding pressure, and the process parameters are determined according to the material and specification of the metal sheet and the structures and the sizes of the flow guide area and the flow channel on the sheet.
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