CN104363671A - Inner heater of liquid zinc corrosion resistance alloy - Google Patents
Inner heater of liquid zinc corrosion resistance alloy Download PDFInfo
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- CN104363671A CN104363671A CN201410605665.5A CN201410605665A CN104363671A CN 104363671 A CN104363671 A CN 104363671A CN 201410605665 A CN201410605665 A CN 201410605665A CN 104363671 A CN104363671 A CN 104363671A
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- electric heating
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Abstract
The invention relates to an inner heater of liquid zinc corrosion resistance alloy. The inner heater of the liquid zinc corrosion resistance alloy is characterized by comprising a compression seal device, an additional pipe, a first connecting flange, a second connecting flange, an outer sleeve, a heat conductor, an electrical heating core, a top pillar, an antioxidant and two extraction electrodes, wherein the electrical heating core is a U-shaped electrical heating pipe, and comprises a heating area and a connection electrode area, a designed number of metal plates are evenly distributed along the length direction of the heating area of the electrical heating core, a disk is welded at the top of the connection electrode area of the electrical heating core, the top of the U-shaped electrical heating pipe and the disk are welded into a whole, the two extraction electrodes are respectively extracted from two ends of the U-shaped electrical heating pipe, the two extraction electrodes are connected with a power source through lead wires, a connection blind hole is formed in the disk, the lower end of the top pillar is connected with the connection blind hole, the upper end of the top pillar is connected with a compression bolt, the additional pipe is a cylinder with two ends open, and the upper end of the additional pipe is connected with the disk.
Description
Technical field
The present invention relates to heater, particularly a kind of for hot galvanizing industry, the corrosion resistance to zinc liquid alloy internal heater of zinc liquid in the direct heating galvanizing pot of energy.
Background technology
At present, in adopting, mode of heating carries out hot galvanizing heater used, and general Inorganic Non-metallic Materials, if quartz glass, carborundum, silicon nitride or graphite etc. are as the outer tube of corrosion resistance to zinc liquid, then load electric heating body within it and makes.Because these material fragilities are large, fragile, the life-span is low, and because integral heater heat transfer is slow, the heat efficiency is low, therefore be not suitable for large-scale industrial production.Although and the outer tube intensity made of common metal material is high, good toughness, heat transfer efficiency are high, because of its not corrosion resistance to zinc liquid, therefore also cannot apply in the industry.Therefore, the hot galvanizing internal heater of function admirable fails to come out always, and this have impact on development and the technological progress of hot galvanizing industry greatly.
Summary of the invention
For the deficiencies in the prior art, the technical problem that quasi-solution of the present invention is determined is, provides a kind of corrosion resistance to zinc liquid alloy internal heater.The outer tube that this internal heater adopts particulate metal material to make and internal electrical heating core, heat carrier are made, to overcome in prior art that internal heater heat transfer is slow, the heat efficiency is low, fragility is large, fragile, the life-span is low, be difficult to the problem for aspects such as large-scale industrial production, be more suitable for commercial Application.
The present invention solve the technical problem adopted technical scheme, a kind of corrosion resistance to zinc liquid alloy internal heater is provided, it is characterized in that this internal heater comprises pressed sealing device, extension spray lance, the first adpting flange, the second adpting flange, outer tube, heat carrier, electric heating core, fore-set, antioxidant and extraction electrode; Described electric heating core is U-shaped electric heating tube, comprise hot zone and connecting electrode district, the metallic plate of design quantity is evenly equipped with along its length in the hot zone of electric heating core, the top in electric heating core connecting electrode district is welded with disk, top and the disk of U-shaped electric heating tube are welded as a whole, an extraction electrode is drawn at the two ends of U-shaped electric heating tube respectively, and extraction electrode is connected with power supply by wire; Described disk is provided with connection blind hole, the lower end of fore-set be connected blind hole and connect, the upper end of fore-set is connected with hold-down bolt; Described extension spray lance is the cylinder of both ends open, and extension spray lance upper end is connected with disk; Described electric heating core is fixed on extension spray lance upper port by pressed sealing device, fore-set, the first sealing gasket sealing; Lower end and first adpting flange of extension spray lance are welded as a whole; Described outer tube is the cylinder-shaped sleeve of bottom end closure, upper end open, and be made up of tungsten-molybdenum alloy, second adpting flange is fixed on the upper end of outer tube by jackscrew, then is connected and sealed the lower end of outer tube and extension spray lance by bolt, clip, the second sealing gasket; Described heat carrier is positioned in outer tube, and heat carrier is low-melting-point metal or alloy, and during work, electric heating core is immersed in heat carrier, and antioxidant is covered in heat carrier upper surface.
Compared with prior art, internal heater outer tube of the present invention adopts tungsten-molybdenum alloy to make, and have excellent Zn solution corrosion resistance, good heat conductivity and higher mechanical strength, the life-span can reach more than 3 years; The present invention is in the heating of zinc liquid inside, and the heat of electric heating core release is almost all absorbed by zinc liquid, and effectively reduce the thermal loss of galvanized pot, heat transfer efficiency up to more than 90%, can exceed 43% than traditional external heat; The present invention is evenly equipped with the circular metal plate of design quantity along its length at electric heating core, ensure that the uniformity of zinc liquid longitudinal temperature, avoid zinc liquid surface Yin Gaowen and produce a large amount of oxidation zinc grays, the phenomenon of a large amount of zinc fume that volatilizees, both be beneficial to the zinc consumption that environmental protection again reduces product, zinc 10-15% can have been saved; After adopting internal heater of the present invention, the homogeneous temperature that zinc pot bears everywhere, makes zinc pot thermal stress reduce, avoids the tearing tendency of zinc pot, substantially prolongs the life-span of zinc pot, generally higher than 10 years simultaneously; Heat carrier is equipped with in this internal heater inside, and outside heat transfer rate is fast, makes zinc liquid temperature ramp-up rate fast, therefore can meet due to the requirement compensated fast heat that boosts productivity.Internal heater of the present invention belongs to discrete heating system, often props up heater and all can install separately, dismantles, change, and without the need to other heater of interlock, when electric heating core damages, is easy to realize maintenance, change.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of embodiment of corrosion resistance to zinc liquid alloy internal heater of the present invention;
Fig. 2 is the mounting structure schematic diagram that a kind of embodiment of corrosion resistance to zinc liquid alloy internal heater of the present invention is arranged in ceramic galvanized pot 21;
In figure: 1-pressed sealing device 2-fore-set 3-first sealing gasket 4-extension spray lance 5-first adpting flange 6-bolt 7-second adpting flange 8-outer tube 9-heat carrier 10-electric heating core 11-antioxidant 12-jackscrew 13-clip 14-second sealing gasket 15-extraction electrode 16-wire 17-hold-down bolt 18-metallic plate 19-heater support 20-zinc liquid 21-pottery galvanized pot (zinc pot or galvanized pot).
Embodiment
The present invention is described in detail below in conjunction with embodiment and accompanying drawing thereof.Embodiment is the concrete enforcement carried out premised on technical scheme of the present invention, but the claims of the application is not limited to the description scope of described embodiment.
Corrosion resistance to zinc liquid alloy internal heater of the present invention (being called for short internal heater, see Fig. 1-2) comprises pressed sealing device 1, extension spray lance 4, first adpting flange 5, second adpting flange 7, outer tube 8, heat carrier 9, electric heating core 10, fore-set 2, antioxidant 11 and extraction electrode 15; Described electric heating core 10 is U-shaped electric heating tube, comprise hot zone and connecting electrode district, the metallic plate 18 of design quantity is evenly equipped with along its length in the hot zone of electric heating core, the top in electric heating core connecting electrode district is welded with disk, top and the disk of U-shaped electric heating tube are welded as a whole, an extraction electrode 15 is drawn at the two ends of U-shaped electric heating tube respectively, and extraction electrode 15 is connected with power supply by wire 16; Described disk is provided with connection blind hole, the lower end of fore-set 2 be connected blind hole and connect, the upper end of fore-set 2 is connected with hold-down bolt 17; Described extension spray lance 4 is the cylinder of both ends open, and extension spray lance 4 upper end is connected with disk; Described electric heating core 10 is fixed on the upper port of extension spray lance 4 by pressed sealing device 1, the sealing of fore-set 2, first sealing gasket 3; Lower end and first adpting flange 5 of extension spray lance 4 are welded as a whole; Described outer tube 8 is the cylinder-shaped sleeve of bottom end closure, upper end open, and be made up of tungsten-molybdenum alloy, second adpting flange 7 is fixed on the upper end of outer tube 8 by jackscrew 12, then is connected and sealed the lower end of outer tube 8 with extension spray lance 4 by bolt 6, clip 13, second sealing gasket 14; Described heat carrier 9 is positioned in outer tube 8, and heat carrier 9 is low-melting-point metal or alloy, and during work, electric heating core 10 is immersed in heat carrier 9, and antioxidant 11 is covered in heat carrier 9 upper surface.
Of the present inventionly be further characterized in that described electric heating core 10 is made up of 1 ~ 6 group of U-shaped electric heating tube.
Of the present inventionly be further characterized in that described metallic plate 18 is for cylindrical, the distance between plates of metallic plate is 30 ~ 100mm, and the diameter of metallic plate is 40 ~ 190mm, thickness is 2 ~ 10mm; The hot zone length of electric heating core 10 is 200 ~ 1600mm, and the total length of electric heating core 10 is 400 ~ 2150mm; The external diameter of described outer tube 8 is 60 ~ 300mm, wall thickness is 5 ~ 50mm, length is 300 ~ 1700mm, the external diameter of described extension spray lance 4 is 60 ~ 300mm, wall thickness is 5 ~ 50mm, length is 150 ~ 500mm, and the external diameter of described first adpting flange 5 and the second adpting flange 7 is 100 ~ 400mm, thickness is 10 ~ 50mm.
Of the present inventionly be further characterized in that the mass ratio of tungsten and molybdenum in described tungsten-molybdenum alloy is 1:1.5 ~ 4.
Electric heating core 10, heat carrier 9, antioxidant 11 can be put into outer tube 8 by the upper end open of extension spray lance 4 by the present invention, utilize the parts such as the first adpting flange 5, second adpting flange 7, second sealing gasket 14, bolt 6 to be carried out being connected with extension spray lance 4 by outer tube 8 and by sealing joint; Fore-set 2 upper end connects with hold-down bolt 17, the lower end of fore-set 2 be connected blind hole and connect, by making the hold-down bolt 17 on hold down gag 1 move down, namely by fore-set 2, first sealing gasket 3, electric heating core 10 being fixed on the upper port of extension spray lance 4, and realizing outer tube 8 inner sealing; Heat carrier 9 is low-melting-point metal or alloy, and during heater work, it is in a liquid state, and electric heating core 10 is immersed in wherein, and its effect the heat that electric heating core 10 sends is derived rapidly and imports zinc liquid 20 into by outer tube 8.
Internal heater of the present invention can be independently product, also can be installed in galvanized pot as a heater block.Therefore internal heater of the present invention is particularly conducive to the upgrading of traditional galvanized pot.In other words, the present invention also relates to a kind of galvanized pot, it is characterized in that this galvanized pot is provided with corrosion resistance to zinc liquid alloy internal heater of the present invention.
Using method of the present invention is:
(1) at room temperature, utilize the first adpting flange 5 to be connected with extension spray lance 4 by outer tube 8 with the second adpting flange 7, clip 13, bolt 6, jackscrew 12, second sealing gasket 14 and fluid sealant, and pressed sealing device 1 is fixedly mounted on extension spray lance 4 upper end by flange;
(2) heat carrier 9 is put into outer tube 8, then outer tube 8 is immersed in galvanizing zinc 20, and being placed in heater support 19, outer tube 8 immerses the zinc liquid degree of depth and adjusts by the flange rotatably compressing sealing device 1 lower end and be connected with extension spray lance 4 upper end;
(3) after heat carrier 9 melts, can electric heating core 10 be inserted in outer tube 8 by the upper port of extension spray lance 4, after loading antioxidant 11, recycling pressed sealing device 1, fore-set 2, first sealing gasket 3 pairs of electric heating cores 10 are implemented fix and realize inner sealing (see Fig. 2);
(4) be connected with the wire 16 of electric heating core 10 by power line, combined floodgate power transmission, internal heater is started working.
Embodiment 1
The present embodiment adopts above-mentioned connected mode to connect, outer tube 8 is made for tungsten-molybdenum alloy, wherein the mass fraction of tungsten is 20%, the mass fraction of molybdenum is 80%, heat carrier 9 is low-melting alloy, fusing point is 100 ~ 200 DEG C, and electric heating core 10 adopts 1 U-shaped electric heating tube, and in the hot zone of electric heating core 10, the quantity of metallic plate is 6, distance between plates is 30mm, and the diameter of metallic plate is 40mm, thickness is 2mm; The hot zone length of electric heating core 10 is 200mm, the total length 400mm of electric heating core 10; The external diameter of outer tube 8 is 60mm, wall thickness is 5mm, length is 300mm, and described extension spray lance 4 external diameter is 60mm, wall thickness is 5mm, length is 150mm, and the external diameter of described first adpting flange 5 and the second adpting flange 7 is 100mm, thickness is 10mm.
Embodiment 2
The present embodiment adopts above-mentioned connected mode to connect, outer tube 8 is made for tungsten-molybdenum alloy, wherein the mass fraction of tungsten is 30%, the mass fraction of molybdenum is 70%, heat carrier 9 is low-melting alloy, fusing point is 200-300 DEG C, and electric heating core 10 is made up of 3 groups of U-shaped electric heating tubes, and in the hot zone of electric heating core 10, the quantity of metallic plate is 13, the distance between plates of metallic plate is 70mm, and the diameter of metallic plate is 100mm, thickness is 6mm; The hot zone length 988mm of electric heating core 10, the total length 1450mm of electric heating core 10; The external diameter of described outer tube 8 is 150mm, wall thickness is 20mm, length is 1200mm, and the external diameter of extension spray lance 4 is 150mm, wall thickness is 20mm, length is 300mm, and the external diameter of described first adpting flange 5 and the second adpting flange 7 is 250mm, thickness is 30mm.
Embodiment 3
The present embodiment adopts above-mentioned connected mode to connect, outer tube 8 is made for tungsten-molybdenum alloy, wherein the mass fraction of tungsten is 40%, the mass fraction of molybdenum is 60%, heat carrier 9 is low-melting-point metal, fusing point is 300 ~ 400 DEG C, and electric heating core 10 is made up of 6 groups of U-shaped electric heating tubes, and in the hot zone of electric heating core 10, the quantity of metallic plate is 14, the distance between plates of metallic plate is 100mm, and the diameter of metallic plate is 190mm, thickness is 10mm; The hot zone length 1600mm of electric heating core 10, the total length 2150mm of electric heating core 10; The external diameter of described outer tube 8 is 300mm, wall thickness is 50mm, length is 1700mm, the external diameter of described extension spray lance 4 is 300mm, wall thickness is 50mm, length is 500mm, and the external diameter of described first adpting flange 5 and the second adpting flange 7 is 400mm, thickness is 50mm.
Embodiment 4
Adopt the internal heater of embodiment 1-3 to put into the ceramic galvanized pot 21 of different depth respectively, be fixed by heater support 19 pairs of internal heaters, then zinc liquid 20 heated.When zinc liquid 20 temperature is 600 DEG C, records tungsten-molybdenum alloy liquid zinc corrosion speed and be about 0.02 (g/m
2h), electric heating core 10 surface loading value is 20w/cm
2, internal heater core and outer wall have a narrow range of temperature, and are about 100 DEG C, and the maximum axial temperature difference can be made after installing metallic plate 18 additional to be down to 10 DEG C by 220 DEG C.Zinc liquid 20 axial temperature is made to be tending towards even.
After adopting embodiment 1-3 to carry out interior heat run, obtain as drawn a conclusion:
A. tungsten-molybdenum alloy corrosion resistance is better than other material when zinc liquid temperature is 600 DEG C, and tungsten-molybdenum alloy liquid zinc corrosion speed is only 0.02 (g/m
2and the liquid zinc corrosion speed of Armco iron is 145.41 (g/m h),
2h).
B. the heat transfer effect of heat carrier obviously has heat carrier, and electric heating wicking surface load can value 20w/cm
2, only can get 4w/cm without heat carrier electric heating wicking surface load
2, namely heater power differs 4 times, and also namely the heat efficiency differs 4 times; Have heat carrier to conduct heat rapidly, internal heater core and outer wall have a narrow range of temperature, about 100 DEG C, and without heat carrier, heat transfer is slow, and core and outer wall temperature difference greatly, can up to more than 350 DEG C.
C. electric heating core 10 is installed the axial temperature difference that metallic plate 18 reduces internal heater, can reach 220 DEG C according to measuring the internal heater maximum axial upper and lower temperature difference not installing metallic plate, its upper end temperature can up to nearly 900 DEG C.The maximum axial temperature difference can be made after installing metallic plate additional to be down to 10 DEG C by 220 DEG C, to make zinc liquid axial temperature be tending towards even.
In what is called of the present invention, heating refers to and adopts material with corrosion resistance to zinc liquid to make heater as outer tube, this heater is inserted direct Heating Zn liquid in ceramic galvanized pot, is and carries out interior heating to liquid zinc.The interior heating of pottery galvanized pot solves the etching problem that ceramic galvanized pot can not adopt a difficult problem for external heat and iron zinc pot simultaneously.Can be arranged in ceramic galvanized pot 21 to make the present invention and liquid zinc 20 is directly heated, its concrete size is relevant with output with the size of zinc pot in production, according to the size of the whole outer tube of the depth adjustable of zinc pot and the parts that match, to meet the needs of optimum heating power.If zinc pot size is comparatively large, output is higher, multiple internal heaters of sufficient amount can be installed successively in zinc pot, can ensures that being continuously zinc pot provides heat to carry out continuous zinc coating production.
Internal heater outer tube 8 of the present invention adopts tungsten-molybdenum alloy to make, have excellent Zn solution corrosion resistance (corrosion rate is almost nil in liquid zinc), good heat conductivity and higher mechanical strength, the preparation method of tungsten-molybdenum alloy can according to prior art.Because outer tube 8 can not be corroded, its inside easily can be effectively protected by the electric heating core 10 of liquid zinc corrosion, therefore it can Long-Time Service in liquid zinc, and the life-span can reach more than 3 years.Therefore, the present invention can long-term immersion and not being corroded in the zinc liquid below 600 DEG C, also can be used for heating the alloy electroplating bath high to plating solution purity requirement in addition, as Zn-5%Al alloy electroplating bath.
Pottery the energy-conservation of galvanized pot 21 mainly contains two approach, and one is improve the efficiency of thermal source to zinc liquid transferring heat, and two is reduce thermal loss.Owing to heating in zinc liquid 20 inside, the heat that electric heating core 10 discharges almost all is absorbed by zinc liquid, therefore heat transfer efficiency can up to more than 90%, higher than traditional external heat by 43%.Electric heating core 10 is evenly equipped with the metallic plate 18 of design quantity along its length, therefore zinc liquid longitudinal temperature uniformity is good, can not occur in zinc liquid surface Yin Gaowen and produce a large amount of oxidation zinc grays and a large amount of zinc fume volatilization phenomenon, both be beneficial to the zinc consumption that environmental protection again reduces product, zinc 10-15% can have been saved relative to other internal heater.Because heat carrier 9 is equipped with in this internal heater inside, therefore outwards heat transfer rate is fast, and such electric heating core 10 can be made into relatively high power (being 3-5 times of other same volume electric heating core power), and namely single internal heater can be made into relatively high power.Due to rapid heat dissipation, make zinc liquid temperature ramp-up rate fast (being 3-5 times that does not add heat carrier internal heater), therefore can meet due to the requirement compensated fast heat that boosts productivity.
After adopting the present invention to carry out interior heating to ceramic galvanized pot, zinc liquid longitudinal temperature uniformity is good, so the homogeneous temperature that ceramic galvanized pot bears everywhere, zinc pot thermal stress is caused to reduce, avoid the tearing tendency of zinc pot, therefore the life-span of zinc pot can extend, greatly generally higher than 10 years.Internal heater of the present invention belongs to discrete heating system, often props up heater and all can install separately, dismantles, change, and without the need to other heater of interlock, when electric heating body damages, is easy to realize maintenance, change by pressed sealing device 1.
The present invention does not address part and is all applicable to prior art.
Claims (5)
1. a corrosion resistance to zinc liquid alloy internal heater, is characterized in that this internal heater comprises pressed sealing device, extension spray lance, the first adpting flange, the second adpting flange, outer tube, heat carrier, electric heating core, fore-set, antioxidant and extraction electrode; Described electric heating core is U-shaped electric heating tube, comprise hot zone and connecting electrode district, the metallic plate of design quantity is evenly equipped with along its length in the hot zone of electric heating core, the top in electric heating core connecting electrode district is welded with disk, top and the disk of U-shaped electric heating tube are welded as a whole, an extraction electrode is drawn at the two ends of U-shaped electric heating tube respectively, and extraction electrode is connected with power supply by wire; Described disk is provided with connection blind hole, the lower end of fore-set be connected blind hole and connect, the upper end of fore-set is connected with hold-down bolt; Described extension spray lance is the cylinder of both ends open, and extension spray lance upper end is connected with disk; Described electric heating core is fixed on extension spray lance upper port by pressed sealing device, fore-set, the first sealing gasket sealing; Lower end and first adpting flange of extension spray lance are welded as a whole; Described outer tube is the cylinder-shaped sleeve of bottom end closure, upper end open, and be made up of tungsten-molybdenum alloy, second adpting flange is fixed on the upper end of outer tube by jackscrew, then is connected and sealed the lower end of outer tube and extension spray lance by bolt, clip, the second sealing gasket; Described heat carrier is positioned in outer tube, and heat carrier is low-melting-point metal or alloy, and during work, electric heating core is immersed in heat carrier, and antioxidant is covered in heat carrier upper surface.
2. corrosion resistance to zinc liquid alloy internal heater according to claim 1, is characterized in that described electric heating core is made up of 1 ~ 6 group of U-shaped electric heating tube..
3. corrosion resistance to zinc liquid alloy internal heater according to claim 1, is characterized in that described metallic plate is cylindrical, and the distance between plates of metallic plate is 30 ~ 100mm, and the diameter of metallic plate is 40 ~ 190mm, thickness is 2 ~ 10mm; The hot zone length of electric heating core is 200 ~ 1600mm, and the total length of electric heating core is 400 ~ 2150mm; The external diameter of described outer tube is 60 ~ 300mm, wall thickness is 5 ~ 50mm, length is 300 ~ 1700mm, the external diameter of described extension spray lance is 60 ~ 300mm, wall thickness is 5 ~ 50mm, length is 150 ~ 500mm, and the external diameter of described first adpting flange and the second adpting flange is 100 ~ 400mm, thickness is 10 ~ 50mm.
4., according to the arbitrary described corrosion resistance to zinc liquid alloy internal heater of claim 1-3, it is characterized in that the mass ratio of tungsten and molybdenum in described tungsten-molybdenum alloy is 1:1.5 ~ 4.
5. a galvanized pot, is characterized in that this galvanized pot is provided with the arbitrary described corrosion resistance to zinc liquid alloy internal heater of claim 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410605665.5A CN104363671B (en) | 2014-10-31 | 2014-10-31 | Corrosion resistance to zinc liquid alloy internal heater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410605665.5A CN104363671B (en) | 2014-10-31 | 2014-10-31 | Corrosion resistance to zinc liquid alloy internal heater |
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| Publication Number | Publication Date |
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| CN104363671A true CN104363671A (en) | 2015-02-18 |
| CN104363671B CN104363671B (en) | 2015-12-16 |
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| CN105274461A (en) * | 2015-12-03 | 2016-01-27 | 成都朋昌电力构件有限公司 | Boiler used for metal zinc dipping |
| CN107953745A (en) * | 2017-12-22 | 2018-04-24 | 北京亿华通科技股份有限公司 | A kind of onboard electrical heating unit |
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