CN114909806A - High-pressure fluid microchannel electric heater and manufacturing method thereof - Google Patents
High-pressure fluid microchannel electric heater and manufacturing method thereof Download PDFInfo
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- CN114909806A CN114909806A CN202210557645.XA CN202210557645A CN114909806A CN 114909806 A CN114909806 A CN 114909806A CN 202210557645 A CN202210557645 A CN 202210557645A CN 114909806 A CN114909806 A CN 114909806A
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- 239000012530 fluid Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000005485 electric heating Methods 0.000 claims abstract description 68
- 239000002184 metal Substances 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims description 26
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 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
- 238000009841 combustion method Methods 0.000 description 1
- 238000010276 construction Methods 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
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000003208 petroleum Substances 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
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Classifications
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- 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]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Abstract
The invention provides a high-pressure fluid microchannel electric heater and a preparation method thereof.A metal microchannel heat exchange plate and an electric heating plate are sequentially and alternately superposed between a top plate and a bottom plate; each layer of metal micro-channel heat exchange plate comprises a pair of symmetrically folded runner plates, and a fluid channel is arranged in each runner plate; the electric heating plate comprises an electric heating plate layer and an insulating layer, the electric heating plate layer comprises a heating resistor formed by connecting a plurality of n-shaped metal sheets in series, the n-shaped metal sheets are transversely and uniformly distributed, and the electric heating plate layer is isolated from the contact surface and the transverse two ends of the metal micro-channel heat exchange plate by the insulating layer; the transverse two ends of the electric heating plate are provided with frames; two wiring points are reserved on the electric heating sheet layer of each layer of 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-resistant grade.
Description
Technical Field
The invention provides a high-pressure fluid microchannel electric heater and a manufacturing method thereof, belonging to the technical field of fluid electric heaters.
Background
The high-pressure fluid electric heater widely used in petroleum, chemical, medicine and other industries is mainly in the form of a shell-and-tube electric heater, and the body mainly comprises an armored electric heating tube bundle, a cylinder, a guide plate and the like. The armored electric heating 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 general tube diameter is thicker, the surface temperature of the resistance wire has larger temperature difference with the outer surface of the armor, the heat exchange area of the outer surface is limited, and fins are required to be processed on the outer surface to expand the heat exchange area sometimes. The tubular electric heating element can not guarantee that the heat transfer is even in the barrel, and the during operation has local electrothermal tube surface temperature too high possibility even dry combustion method, and then leads to the resistance wire to generate heat and can not in time spread for the resistance wire is super-warm, and easy fusing influences life. The flow guide partition plate is arranged in the cylinder body so as to ensure that the fluid is heated as uniformly as possible when circulating and the electrothermal tube is cooled as uniformly as possible. The cylinder body generally belongs to a pressure container, the size and the wall thickness of the cylinder body are influenced by the pressure-resistant grade, and for some limit working conditions of high temperature and high pressure, the cylinder body needs to be very thick and heavy, the size is very large, and the economical efficiency is poor.
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 fluid in the cylinder body exchanges heat with the electric heating tube unevenly, and a local hot spot exists, so that the heating effect and the service life of the electric heating tube are influenced; (3) the barrel belongs to pressure vessel, and is bulky, heavy, the consumptive material is many, and the economic nature is relatively poor.
Disclosure of Invention
The invention provides a high-pressure fluid microchannel electric heater and a manufacturing method thereof, the heater has the advantages of compact volume, high power density, strong pressure-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 microchannel heat exchange plates and the electric heating plate are sequentially and alternately superposed;
each layer of metal micro-channel heat exchange plate comprises a pair of symmetrically folded runner plates, fluid channel grooves are longitudinally distributed on the folded surface of each runner plate, and the fluid channel grooves of one pair of runner plates form a fluid channel with the diameter of millimeter to hundred microns;
the electric heating plate comprises an electric heating plate layer and an insulating layer, wherein the electric heating plate layer comprises a heating resistor formed by connecting a plurality of n-shaped metal sheets in series, the n-shaped metal sheets are transversely and uniformly distributed, and the insulating layers are arranged on the contact surface and the transverse two ends of the electric heating plate layer and the metal micro-channel heat exchange plate for isolation; the transverse two 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 electric heating plate, and the electric heating sheet layers of each layer of 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 the two transverse ends of the electric heating plate.
The manufacturing method of the high-pressure fluid microchannel 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 thin plate which is transversely staggered and uniformly provided with elongated rectangular hollow grooves, the hollow grooves at the two transverse ends are slightly long and are equidistant to the upper edge and the lower edge in the longitudinal direction, the hollow groove in the middle is slightly short, the adjacent hollow grooves are respectively aligned with the tops or the bottoms of the hollow grooves at the two transverse ends, and the positions in the longitudinal direction are staggered; installing blanks of frames on the upper and lower parts of a blank of the electric heating sheet layer, welding and fixing the blanks into a combined body by argon arc welding, coating films on the upper and lower parts of the frame of the combined body, putting the combined body on a flat pressing mould, filling insulating powder into a gap inside the blank of the frame to be used as an insulating layer, compacting by a press, refilling, compacting again, repeating for multiple times until the powder is not compressed any more when the pressure reaches 100MPa, taking out the combined body from the mould, and removing the films to obtain the blank of the electric heating plate;
the stacking sequence of various sheets from bottom to top is as follows: repeating a plurality of groups of the blanks of the bottom plate according to the sequence of the blanks of the metal micro-channel heat exchange plate and the blanks of the electric heating plate, wherein the number of the repeated groups is an even number, and finally finishing by using the blanks of the metal micro-channel heat exchange plate and the blanks of the top plate;
after all the plate sheets are stacked and assembled, compacting the plate sheets by a press machine until no gap exists around and corners are aligned, and respectively selecting a line in the vertical direction on the four sides and welding and fixing the line by argon arc welding;
removing the press machine, and conveying the assembly body into a vacuum diffusion welding furnace for welding;
after welding and integral cooling, cutting off the longitudinal two sides of the frame blank, the blank of the metal micro-channel heat exchange plate, the blank of the electric heating plate and the connecting part of the longitudinal two sides of the frame blank along the transverse direction;
two points of the first wiring point and the second wiring point are used as wiring points, and a lead is welded;
and performing insulation packaging on the cutting surfaces at the two sides, and performing overall heat preservation to obtain the high-pressure fluid microchannel 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 channel layers and the heating layers, so that the electric heater can adapt to more flow ranges on the premise of ensuring the pressure-resistant grade.
The interior of the device is not provided with a pressure container, the device does not need to be filed for annual inspection, and the device can adapt to various harsh environments and has a wider application range.
The process flow is less, the production efficiency is high, and the comprehensive cost is low.
Drawings
FIG. 1 is a schematic view of the present invention in partial cross-section;
FIG. 2 is a first enlarged partial view of FIG. 1;
FIG. 3 is a second enlarged fragmentary view of FIG. 1;
FIG. 4 is a third enlarged partial view of FIG. 1;
FIG. 5 is a schematic view of a blank construction of the runner plate;
FIG. 6 is a schematic view of a blank structure for the rim;
fig. 7 is a schematic view of a slab structure of an electric heating plate.
Detailed Description
As shown in fig. 1 to 4, in the high pressure fluid microchannel electric heater according to the present invention, between a top plate 3 and a bottom plate 5, metal microchannel heat exchange plates 1 and electric heating plates 2 are alternately stacked. The metal micro-channel heat exchange plate 1 is composed of two flow channel plates 11, a fluid channel 12 with the diameter of millimeter to hundred micrometers is transversely distributed in the metal micro-channel heat exchange plate from left to right, the upper wall thickness and the lower wall thickness of the fluid channel 12 are also millimeter to hundred micrometers, the metal micro-channel heat exchange plate is very thin and can bear high pressure, and the inner wall of the fluid channel 12 has a large heat exchange area and a high heat exchange coefficient; the transverse left and right ends of all the metal micro-channel heat exchange plates 1 are connected into a whole and are inlet and outlet of fluid.
The electric heating plate 2 is composed of an electric heating plate layer 21 and an insulating layer 22, the electric heating plate layer 21 comprises a heating resistor formed by connecting a plurality of n-shaped metal sheets in series, the n-shaped metal sheets are transversely and uniformly distributed, and the insulating layer 22 is used for isolating the upper surface and the lower surface of the electric heating plate layer 21 from the metal micro-channel heat exchange plate 1; the frame 4 is arranged at both transverse ends of the electric heating plate 2, and the frame 4 is not connected with the left end and the right end of the electric heating plate layer 21 and is isolated by the 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 layer of electric heating plate 2; the first connecting point 7 and the second connecting point 8 are respectively arranged at the two transverse ends of the electric heating plate 2.
The electric heating sheet layers 21 of each electric heating plate 2 can be combined in series or in parallel through welding connecting lines to obtain different resistances, so that different output powers can be achieved, and the power density can reach 10-50W/cm 2 。
The invention relates to a method for manufacturing 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, the plates are welded into a whole under specific conditions of vacuum, pressurization, heating and the like by adopting a vacuum diffusion welding process, and the manufacturing can be finished through post-treatment.
Specifically, the manufacturing method of the high-pressure fluid microchannel electric heater needs five types of plate sheets, namely a top plate 3, a metal microchannel heat exchange plate 1, a frame 4, an electric heating plate 2, a bottom plate 5 and the like.
The blank of the frame 4 is arranged on the periphery of the blank of the electric heating plate layer 21; the blank of the electric heating sheet layer 21 is combined with the blank of the frame 4 from the upper surface and the lower surface before assembly, aligned and compacted, a plurality of points are found on the side surface and are welded and fixed into a combined body by argon arc welding, the upper frame and the lower frame of the combined body are coated with films to protect the welding surface, then the combined body is placed on a flat pressing die, an insulating powder body is filled in a gap inside the blank of the frame 4 to be used as an insulating layer 22, a small amount of inorganic adhesive can be added into the insulating powder body, the insulating powder body is compacted by a press machine, refilled, recompressed and repeated for a plurality of times until the powder body is not compressed under the pressure of 100MPa, the combined body is taken out of the die, the coated films are removed, the blank of the electric heating plate 2 is obtained, and the whole electric heating plate is stacked on the combined body.
The stacking sequence of various sheets from bottom to top is as follows: the blanks of the bottom plate 5 are then cyclically repeated for a plurality of groups, usually 8, 10 or 12 groups, in the order of the blanks of the metal microchannel heat exchanger plate 1 and the blanks of the electric heating plate 2, the number of repeated groups being even numbers, so as to facilitate parallel or serial combination, and finally the steps are finished with the blanks of the metal microchannel heat exchanger plate 1 and the blanks of the top plate 3.
After all the plates are stacked and assembled, the plates are compacted by a press machine until no gap exists around and corners are aligned, a vertical line is selected on each of the four sides and is welded and fixed by argon arc welding, the press machine is removed, and the assembly body is sent into a vacuum diffusion welding furnace for welding. After welding and after the whole body is cooled, cutting along the cutting line 6, cutting off the connecting part of the blank of the electric heating plate 2, the blank of the runner plate 11 and the longitudinal edge of the blank of the frame 4, as shown in fig. 5 to 7, cutting schematic diagrams of the blanks of all the plates to realize electric insulation with the body, and using two points of the first wiring point 7 and the second wiring point 8 as wiring points for welding a lead. After the welding of the lead, further insulating packaging can be carried out on the cutting surfaces at the two sides, and finally the integral heat preservation is carried out, so that the processing and manufacturing of the high-pressure fluid micro-channel electric heater are basically completed.
Claims (3)
1. The high-pressure fluid microchannel electric heater is characterized by comprising a top plate (3) and a bottom plate (5), and further comprising a plurality of layers of metal microchannel heat exchange plates (1) and a plurality of layers of electric heating plates (2); between the top plate (3) and the bottom plate (5), the metal microchannel heat exchange plates (1) and the electric heating plate (2) are sequentially and alternately superposed;
each layer of 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 plate layer (21) and an insulating layer (22), the electric heating plate layer (21) comprises a heating resistor, the heating resistor is formed by connecting a plurality of metal sheets in a shape like a Chinese character 'ji' in series, the metal sheets in the shape like the Chinese character 'ji' are transversely and uniformly distributed, and the electric heating plate layer (21) is isolated from the contact surface and the transverse two ends of the metal micro-channel heat exchange plate (1) by the insulating layer (22); both transverse ends of the electric heating plate (2) are provided with frames (4);
two wiring points, namely a first wiring point (7) and a second wiring point (8), are reserved on the electric heating plate layers (21) of each layer of electric heating plate (2), and the electric heating plate layers (21) of each layer of electric heating plate (2) are connected in series or in parallel through welding wiring lines.
2. The high pressure fluid microchannel electric heater as claimed in claim 1, wherein the first terminal (7) and the second terminal (8) are respectively provided at both lateral ends of the electric heating plate (2).
3. The method of manufacturing a high pressure fluid microchannel electric heater as claimed in claim 1 or 2, comprising the steps of:
the blank of the frame (4) is a rectangular frame, the blank of the electric heating sheet layer (21) is a metal thin plate which is transversely staggered and uniformly distributed with elongated rectangular hollow grooves, the hollow grooves at the two transverse ends are longer than the hollow grooves in the middle, the hollow grooves at the two transverse ends are equidistant from the upper edge and the lower edge in the longitudinal direction, the adjacent hollow grooves in the middle are respectively aligned with the tops or the bottoms of the hollow grooves at the two transverse ends, and the positions in the longitudinal direction are staggered;
installing blanks of frames (4) on the upper and lower sides of a blank of the electric heating sheet layer (21), welding and fixing the blanks into a combined body by argon arc welding, coating films on the upper and lower sides of the frame of the combined body, putting the combined body on a flat pressing die, filling insulating powder into a gap inside the blank of the frame (4) to be used as an insulating layer (22), compacting by a press, refilling, compacting again, repeating for multiple times until the powder is not compressed any more when the pressure reaches 100MPa, taking out the combined body from the die, and removing the coating films to obtain a blank of the electric heating plate (2);
the stacking sequence of various sheets from bottom to top is as follows: repeating a plurality of groups of blanks of the bottom plate (5) in a circulating manner according to the sequence of the blanks of the metal micro-channel heat exchange plate (1) and the blanks of the electric heating plate (2), wherein the number of the repeated groups is even, and finally finishing by using the blanks of the metal micro-channel heat exchange plate (1) and the blanks of the top plate (3);
after all the plate sheets are stacked and assembled, compacting the plate sheets by a press machine until no gap exists around and corners are aligned, and respectively selecting a line in the vertical direction on the four sides and welding and fixing the line by argon arc welding;
removing the press machine, and conveying the assembly body into a vacuum diffusion welding furnace for welding;
after welding and integral cooling, cutting off the longitudinal two sides of the blank of the frame (4), the blank of the metal micro-channel heat exchange plate (1), the blank of the electric heating plate (2) and the connecting part of the longitudinal two sides of the blank of the frame (4) along the transverse direction;
two points of the first wiring point (7) and the second wiring point (8) are used as wiring points, and a lead is welded;
and performing insulation packaging on the cutting surfaces at the two sides, and performing overall heat preservation to obtain the high-pressure fluid microchannel electric heater.
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 |
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| CN114909806A true CN114909806A (en) | 2022-08-16 |
| CN114909806B CN114909806B (en) | 2023-12-29 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090071625A1 (en) * | 2007-08-09 | 2009-03-19 | Coolit Systems Inc. | Fluid heat exchanger |
| 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 |
-
2022
- 2022-05-19 CN CN202210557645.XA patent/CN114909806B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090071625A1 (en) * | 2007-08-09 | 2009-03-19 | Coolit Systems Inc. | Fluid heat exchanger |
| 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 (1)
| 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, pages: 360 - 364 * |
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| CN114909806B (en) | 2023-12-29 |
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