CN114909806B - High-pressure fluid micro-channel electric heater and manufacturing method thereof - Google Patents
High-pressure fluid micro-channel electric heater and manufacturing method thereof Download PDFInfo
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- CN114909806B CN114909806B CN202210557645.XA CN202210557645A CN114909806B CN 114909806 B CN114909806 B CN 114909806B CN 202210557645 A CN202210557645 A CN 202210557645A CN 114909806 B CN114909806 B CN 114909806B
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- electric heating
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- heat exchange
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- 239000012530 fluid Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 238000005485 electric heating Methods 0.000 claims abstract description 68
- 239000002184 metal Substances 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Abstract
The invention provides a high-pressure fluid microchannel electric heater and a preparation method thereof, wherein a metal microchannel heat exchange plate and an electric heating plate are sequentially and alternately overlapped between a top plate and a bottom plate; each layer of metal micro-channel heat exchange plate comprises a pair of symmetrically folded flow channel plates, and a fluid channel is arranged in each layer of metal micro-channel heat exchange plate; the electric heating plate comprises an electric heating sheet layer and an insulating layer, wherein the electric heating sheet layer comprises a heating resistor formed by connecting a plurality of metal sheets in a shape like a Chinese character 'ji' in series, the metal sheets in the shape of the Chinese character 'ji' are transversely uniformly distributed, and the contact surfaces of the electric heating sheet layer and the metal microchannel heat exchange plate and the transverse two ends of the electric heating sheet layer are respectively provided with an insulating layer for isolation; both transverse ends of the electric heating plate are provided with frames; two connection points are reserved on the electric heating sheet layer of each layer of the electric heating plate. The invention has compact volume, high power density, strong bearing capacity, high temperature resistance, uniform heat exchange and long service life. The invention can adapt to more flow ranges on the premise of ensuring the pressure resistance level.
Description
Technical Field
The invention provides a high-pressure fluid micro-channel electric heater and a manufacturing method thereof, and belongs to the technical field of fluid electric heaters.
Background
The main form of the high-pressure fluid electric heater widely applied in the industries of petroleum, chemical industry, medicine and the like is a shell-and-tube electric heater, and the body mainly comprises an armored electric heating tube bundle, a cylinder body, a guide plate and the like. The armoured electrothermal tube is characterized in that a high-temperature resistance wire is placed in a metal tube, an insulating material is tightly filled in a gap part, the tube diameter is generally thicker, the surface temperature of the resistance wire has a larger temperature difference with the outer surface of the armoured, the heat exchange area of the outer surface is limited, and sometimes, fins are required to be machined on the outer surface to expand the heat exchange area. The electric heating tube bundles cannot ensure uniform heat exchange in the tube body, and the possibility of overhigh surface temperature and even dry burning of the local electric heating tube exists in the working process, so that the resistance wire cannot be timely diffused in heating, the resistance wire is over-heated and is easy to fuse, and the service life is influenced. The guide baffle is arranged in the cylinder body so as to ensure that the fluid is heated as uniformly as possible during circulation, and simultaneously, the electric heating tube is cooled as uniformly as possible. The cylinder belongs to a pressure container generally, the size and the wall thickness of the cylinder are influenced by the pressure resistance level, and the cylinder is very thick and heavy, has very large volume and has poor economical efficiency for some limit working conditions of high temperature and high pressure.
The prior pipeline heater has the following technical defects: (1) The heat exchange area of the outer surface of the armored electric heating tube is small, and the heating efficiency is low; (2) The heat exchange between the fluid in the cylinder body and the electric heating tube is uneven, and local hot spots exist, so that the heating effect and the service life of the electric heating tube are affected; (3) The barrel belongs to the pressure vessel, and is bulky, weight is heavy, the consumptive material is many, and economic nature is relatively poor.
Disclosure of Invention
The invention provides a high-pressure fluid microchannel electric heater and a manufacturing method thereof, wherein the heater has the advantages of compact volume, high power density, strong bearing capacity, high temperature resistance, uniform heat exchange, long service life and the like, and the processing and manufacturing method has the advantages of less process flow, high production efficiency and low comprehensive cost.
The high-pressure fluid microchannel electric heater comprises a top plate, a bottom plate, a plurality of layers of metal microchannel heat exchange plates and a plurality of layers of electric heating plates; between the top plate and the bottom plate, the metal micro-channel heat exchange plate and the electric heating plate are alternately overlapped in sequence;
each layer of metal micro-channel heat exchange plate comprises a pair of symmetrically folded flow channel plates, the folding surfaces of the flow channel plates are longitudinally distributed with fluid channel grooves, and the fluid channel grooves of the pair of flow channel plates form a fluid channel with the diameter of millimeter to hundred micrometers;
the electric heating plate comprises an electric heating sheet layer and an insulating layer, wherein the electric heating sheet layer comprises a heating resistor formed by connecting a plurality of metal sheets in a shape like a Chinese character 'ji' in series, the metal sheets in the shape of the Chinese character 'ji' are transversely and uniformly distributed, and the contact surfaces of the electric heating sheet layer and the metal microchannel heat exchange plate and the transverse two ends of the electric heating sheet layer are respectively provided with the insulating layer for isolation; both transverse ends of the electric heating plate are provided with frames;
two wiring points, namely a first wiring point and a second wiring point, are reserved on the electric heating sheet layers of each layer of the electric heating plate, and the electric heating sheet layers of each layer of the electric heating plate are connected in series or in parallel through welding connection lines.
The first wiring point and the second wiring point are respectively arranged at two transverse ends of the electric heating plate.
The manufacturing method of the high-pressure fluid micro-channel electric heater comprises the following steps:
the blank of the frame is a rectangular frame, the blank of the electric heating sheet layer is a metal sheet with transversely staggered elongated rectangular hollowed-out grooves, the hollowed-out grooves at the two transverse ends are slightly longer and equidistant from the upper side and the lower side of the longitudinal direction, the hollowed-out grooves in the middle are slightly shorter, the adjacent hollowed-out grooves are aligned with the tops or bottoms of the hollowed-out grooves at the two ends respectively, and the positions of the adjacent hollowed-out grooves in the longitudinal direction are staggered; installing blanks of the frames on the upper and lower parts of the blanks of the electric heating sheet layers, welding and fixing the blanks into a combined body by argon arc welding, covering films on the upper and lower parts of the frames of the combined body, putting the combined body on a flat pressing die, filling insulating powder serving as an insulating layer in a gap in the blanks of the frames, compacting by a pressing machine, refilling, compacting again, repeating for a plurality of times until the powder is not compressed again under the pressure of 100MPa, taking the combined body out of the die, and removing the covering films to obtain blanks of the electric heating plate;
the stacking sequence of various plates from bottom to top is as follows: the blank of the bottom plate is circularly repeated in a plurality of groups according to the sequence of the blank of the metal micro-channel heat exchange plate and the blank of the electric heating plate, the repeated groups are even, and finally the blank of the metal micro-channel heat exchange plate and the blank of the top plate are ended;
after all the plates are stacked and assembled, compacting the plates by a press until the periphery is seamless and corners are aligned, and selecting an up-down line on each of the four sides to be welded and fixed by argon arc welding;
removing the press, and conveying the assembly into a vacuum diffusion welding furnace for welding;
after welding, cutting off the two longitudinal sides of the frame blank and the connecting parts of the blank of the metal micro-channel heat exchange plate, the blank of the electric heating plate and the two longitudinal sides of the frame blank along the transverse direction after the whole body is cooled;
the first wiring point and the second wiring point are used as wiring points, and the wires are welded;
and (5) performing insulation packaging on the cutting surfaces at two sides, and integrally preserving heat to obtain the high-pressure fluid micro-channel electric heater.
The invention has the beneficial effects that:
compact volume, high power density, strong bearing capacity, high temperature resistance, uniform heat exchange and long service life.
The electric heater provided by the invention is formed by alternately stacking the flow passage layers and the heating layers, so that the electric heater can adapt to more flow ranges on the premise of ensuring the pressure resistance level.
The inside of the container is free of a pressure container, the annual inspection is not required, the container can adapt to various harsh environments, and the application range is wider.
The process flow is less, the production efficiency is high, and the comprehensive cost is low.
Drawings
FIG. 1 is a schematic view of a partial cross-sectional structure of the present invention;
FIG. 2 is a first partial enlarged schematic view of FIG. 1;
FIG. 3 is a second enlarged partial schematic view of FIG. 1;
FIG. 4 is a third enlarged partial schematic view of FIG. 1;
FIG. 5 is a schematic view of a blank construction of a flow conduit plate;
FIG. 6 is a schematic view of a blank construction of a bezel;
fig. 7 is a schematic view of a plate blank structure of the electric heating plate.
Detailed Description
As shown in fig. 1 to 4, the high-pressure fluid microchannel electric heater according to the present invention is formed by alternately stacking metal microchannel heat exchange plates 1 and electric heating plates 2 between a top plate 3 and a bottom plate 5. The metal micro-channel heat exchange plate 1 is composed of two flow channel plates 11, fluid channels 12 with diameters of millimeter to hundred micrometers are distributed in the metal micro-channel heat exchange plate, the upper wall thickness and the lower wall thickness of the fluid channels 12 are also millimeter to hundred micrometers, the metal micro-channel heat exchange plate is thin and can bear high pressure, and the inner wall of the fluid channels 12 has larger heat exchange area and stronger heat exchange coefficient; all the transverse left and right ends of the metal micro-channel heat exchange plate 1 are connected into a whole and are fluid inlets and outlets.
The electric heating plate 2 is composed of an electric heating sheet layer 21 and an insulating layer 22, wherein the electric heating sheet layer 21 comprises a heating resistor formed by connecting a plurality of metal sheets in a shape like a Chinese character 'ji' in series, the metal sheets in the shape of the Chinese character 'ji' are transversely and uniformly distributed, and the insulating layer 22 is arranged between the upper surface and the lower surface of the electric heating sheet layer 21 and the metal microchannel heat exchange plate 1 for isolation; the two transverse ends of the electric heating plate 2 are respectively provided with a frame 4, and the frames 4 are not connected with the left end and the right end of the electric heating plate layer 21 and are isolated by an insulating layer 22; two wiring positions, namely a first wiring point 7 and a second wiring point 8, are reserved on the electric heating sheet layer 21 of each electric heating plate 2; the first connection point 7 and the second connection point 8 are provided at both ends of the electric heating plate 2 in the lateral direction, respectively.
The electric heating sheets 21 of each layer of electric heating plate 2 can be connected in series or in parallel through welding connection lines to obtain different resistances, different output powers are achieved, and the power density can reach 10-50W/cm 2 。
The invention relates to a manufacturing method of a high-pressure fluid microchannel electric heater, which is a solid-phase additive manufacturing method, namely various metal plates with functional structures are manufactured according to certain functional requirements, all the plates are stacked together according to a specific sequence and positioning, a vacuum diffusion welding process is adopted to weld the plates into a whole under specific conditions of vacuum, pressurization, heating and the like, and the manufacturing can be completed through post-treatment.
Specifically, the manufacturing method of the high-pressure fluid micro-channel electric heater disclosed by the invention requires five types of plates, namely a top plate 3, a metal micro-channel heat exchange plate 1, a frame 4, an electric heating plate 2 and a bottom plate 5.
The blank of the frame 4 is arranged on the periphery of the blank of the electric heating sheet layer 21; the blank of the electrothermal sheet layer 21 is required to be combined with the blank of the frame 4 at the upper and lower sides before assembly, aligned and compacted, a plurality of points are found at the side surface and welded and fixed into a combined body by argon arc welding, the upper and lower frames of the combined body are covered with films to protect the welding surface, then the combined body is placed on a flat pressing die, insulating powder is filled in the internal gap of the blank of the frame 4 as an insulating layer 22, a small amount of inorganic adhesive can be added into the insulating powder, the combined body is compacted by a pressing machine, refilled and compacted again and repeated for a plurality of times until the powder is not compressed under the pressure of 100MPa, the combined body is taken out from the die, the films are removed, the blank of the electric heating plate 2 is obtained, and the whole combined body is stacked on the assembled body.
The stacking sequence of various plates from bottom to top is as follows: the blank of the bottom plate 5 is circularly repeated into a plurality of groups, usually 8, 10 or 12 groups, according to the sequence of the blank of the metal micro-channel heat exchange plate 1 and the blank of the electric heating plate 2, wherein the repeated groups are even in number, so that the parallel connection or the series connection combination is facilitated, and finally the blank of the metal micro-channel heat exchange plate 1 and the blank of the top plate 3 are finished.
After all the plates are stacked and assembled, compacting the plates to the periphery without gaps by using a press machine, aligning corners, respectively selecting a line in the vertical direction on four sides, welding and fixing by using argon arc welding, removing the press machine, and sending the assembly into a vacuum diffusion welding furnace for welding. After the welding, after the whole is cooled, the parts connected with the longitudinal edges of the blank of the electric heating plate 2, the blank of the runner plate 11 and the blank of the frame 4 are cut along the cutting line 6, and as shown in fig. 5 to 7, the blank cutting schematic diagrams of the respective plates are cut, so that the electric insulation with the body is realized, and the two points of the first wiring point 7 and the second wiring point 8 can be used as wiring points for welding wires. After the lead is welded, further insulation packaging can be carried out on the cutting surfaces on two sides, and finally, the whole heat preservation is carried out, so that the processing and the manufacturing of the high-pressure fluid micro-channel electric heater are basically completed.
Claims (2)
1. The manufacturing approach of the electric heater of the high-pressure fluid microchannel, the said electric heater of the high-pressure fluid microchannel, including roof (3) and bottom plate (5), also include the metal microchannel heat exchanger plate of the multilayer (1), multilayer electrical heating plate (2); between the top plate (3) and the bottom plate (5), the metal micro-channel heat exchange plate (1) and the electric heating plate (2) are alternately overlapped in turn;
each layer of the metal micro-channel heat exchange plate (1) comprises a pair of symmetrically folded runner plates (11), fluid channel grooves are longitudinally distributed on the folding surfaces of the runner plates (11), and the fluid channel grooves of the pair of runner plates (11) form a fluid channel (12) with the diameter of millimeter to hundred micrometers;
the electric heating plate (2) comprises an electric heating sheet layer (21) and an insulating layer (22), the electric heating sheet layer (21) comprises a heating resistor, the heating resistor is formed by connecting a plurality of 'several' -shaped metal sheets in series, the 'several' -shaped metal sheets are transversely uniformly distributed, and the contact surface and the transverse two ends of the electric heating sheet layer (21) and the metal microchannel heat exchange plate (1) are respectively provided with the insulating layer (22) for isolation; both transverse ends of the electric heating plate (2) are provided with frames (4);
two wiring points are reserved on the electric heating sheet layers (21) of each layer of the electric heating plate (2), namely a first wiring point (7) and a second wiring point (8), and the electric heating sheet layers (21) of each layer of the electric heating plate (2) are connected in series or in parallel through welding connection lines:
the method is characterized by comprising the following steps of:
the blank of the frame (4) is a rectangular frame, the blank of the electric heating sheet layer (21) is a metal sheet with elongated rectangular hollowed-out grooves transversely and alternately distributed, the hollowed-out grooves at the two transverse ends are longer than those at the middle, the hollowed-out grooves at the two ends are equidistant from the upper side and the lower side in the longitudinal direction, the adjacent hollowed-out grooves in the middle are aligned with the tops or the bottoms of the hollowed-out grooves at the two ends respectively, and the positions in the longitudinal direction are staggered;
installing blanks of a frame (4) on the blanks of an electric heating sheet layer (21) up and down, welding and fixing the blanks into a combination body by argon arc welding, covering films on the upper and lower sides of the frame of the combination body, putting the combination body on a flat pressing die, filling insulating powder in a blank inner gap of the frame (4) as an insulating layer (22), compacting by a pressing machine, refilling, compacting again, repeating for a plurality of times until the powder is not compressed under the pressure of 100MPa, taking the combination body out of the die, and removing the covering films to obtain the blanks of the electric heating plate (2);
the stacking sequence of various plates from bottom to top is as follows: the blank of the bottom plate (5) is circularly repeated into a plurality of groups according to the sequence of the blank of the metal micro-channel heat exchange plate (1) and the blank of the electric heating plate (2), the repeated groups are even, and finally, the blank of the metal micro-channel heat exchange plate (1) and the blank of the top plate (3) are ended;
after all the plates are stacked and assembled, compacting the plates by a press until the periphery is seamless and corners are aligned, and selecting an up-down line on each of the four sides to be welded and fixed by argon arc welding;
removing the press, and conveying the assembly into a vacuum diffusion welding furnace for welding;
after the whole body is cooled, cutting off the two longitudinal sides of the blank of the frame (4) and the connected parts of the blank of the metal micro-channel heat exchange plate (1), the blank of the electric heating plate (2) and the two longitudinal sides of the blank of the frame (4) along the transverse direction;
the first wiring point (7) and the second wiring point (8) are used as wiring points, and wires are welded;
and (5) performing insulation packaging on the cutting surfaces at two sides, and integrally preserving heat to obtain the high-pressure fluid micro-channel electric heater.
2. The method of manufacturing a high-pressure fluid microchannel electric heater according to claim 1, wherein the first junction (7) and the second junction (8) are provided at both ends of the electric heating plate (2) in the lateral direction, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210557645.XA CN114909806B (en) | 2022-05-19 | 2022-05-19 | High-pressure fluid micro-channel electric heater and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210557645.XA CN114909806B (en) | 2022-05-19 | 2022-05-19 | High-pressure fluid micro-channel electric heater and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114909806A CN114909806A (en) | 2022-08-16 |
| CN114909806B true CN114909806B (en) | 2023-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210557645.XA Active CN114909806B (en) | 2022-05-19 | 2022-05-19 | High-pressure fluid micro-channel electric heater and manufacturing method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202598659U (en) * | 2012-05-04 | 2012-12-12 | 发速金属制品(上海)有限公司 | Floor heating device of electrical heating unit |
| CN107318180A (en) * | 2017-08-23 | 2017-11-03 | 湖南智热技术股份有限公司 | A kind of use heat-conducting plate heats the electric heater of fluid |
| EP3290819A1 (en) * | 2016-09-06 | 2018-03-07 | Mahle International GmbH | Electric heating device |
| CN209488826U (en) * | 2018-10-23 | 2019-10-11 | 陕西泰德汽车空调有限公司 | A kind of automobile-used double temperature conditioning unit heating devices |
| CN111819403A (en) * | 2018-03-07 | 2020-10-23 | 达纳加拿大公司 | Heat exchanger with integrated electric heating element and multiple fluid flow passages |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8746330B2 (en) * | 2007-08-09 | 2014-06-10 | Coolit Systems Inc. | Fluid heat exchanger configured to provide a split flow |
-
2022
- 2022-05-19 CN CN202210557645.XA patent/CN114909806B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202598659U (en) * | 2012-05-04 | 2012-12-12 | 发速金属制品(上海)有限公司 | Floor heating device of electrical heating unit |
| EP3290819A1 (en) * | 2016-09-06 | 2018-03-07 | Mahle International GmbH | Electric heating device |
| CN107318180A (en) * | 2017-08-23 | 2017-11-03 | 湖南智热技术股份有限公司 | A kind of use heat-conducting plate heats the electric heater of fluid |
| CN111819403A (en) * | 2018-03-07 | 2020-10-23 | 达纳加拿大公司 | Heat exchanger with integrated electric heating element and multiple fluid flow passages |
| CN209488826U (en) * | 2018-10-23 | 2019-10-11 | 陕西泰德汽车空调有限公司 | A kind of automobile-used double temperature conditioning unit heating devices |
Non-Patent Citations (2)
| Title |
|---|
| 公茂琼，吴剑峰，罗二仓.《深冷混合工质节流制冷原理及应用》.中国轻工业出版社,2014,第360-364页. * |
| 高红霞.《材料成形技术》.中国轻工业出版社,2011,第154-156页. * |
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| CN114909806A (en) | 2022-08-16 |
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