CN114749873A - Method for manufacturing semiconductor chip electrothermal test core rod - Google Patents
Method for manufacturing semiconductor chip electrothermal test core rod Download PDFInfo
- Publication number
- CN114749873A CN114749873A CN202210541419.2A CN202210541419A CN114749873A CN 114749873 A CN114749873 A CN 114749873A CN 202210541419 A CN202210541419 A CN 202210541419A CN 114749873 A CN114749873 A CN 114749873A
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- finished product
- semiconductor chip
- steel pipe
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 229910052573 porcelain Inorganic materials 0.000 claims abstract description 34
- 239000000956 alloy Substances 0.000 claims abstract description 28
- 239000011265 semifinished product Substances 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 239000000919 ceramic Substances 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 238000012546 transfer Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims abstract description 6
- 238000005498 polishing Methods 0.000 claims description 13
- 238000005485 electric heating Methods 0.000 abstract description 10
- 229910002065 alloy metal Inorganic materials 0.000 abstract description 4
- 238000004880 explosion Methods 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 34
- 239000000395 magnesium oxide Substances 0.000 description 24
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 14
- 239000010935 stainless steel Substances 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 8
- 238000005538 encapsulation Methods 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention discloses a manufacturing method of a semiconductor chip electrothermal test core rod, which comprises the following steps of S1: manufacturing a pipe; s2: winding a heating alloy material on the outside of the porcelain rod; s3: inserting alloy wire material in the middle of the ceramic rod wound with the heating alloy material, and connecting with a high temperature wire; s4: making the heat transfer medium into hollow ceramic blocks with various shapes, and sleeving the ceramic rods with wound wires; s6: selectively sleeving the high-temperature wire end of the semi-finished product into the sealing rubber part; s7: sleeving one end of the semi-finished product into the tube body and inserting the semi-finished product into the tube body; the alloy metal is used for heating, and a heat transfer medium is used for heat transfer, so that the accidents of deformation, embrittlement, cracking, electric leakage and explosion of the steel pipe caused by long-time use can be avoided. Based on the structure, the semiconductor chip electric heating test core rod has the advantages of simple manufacturing process, easily obtained raw materials, convenience in manufacturing, no electric leakage, safety, long service life, convenience in operation and high heating speed, and is mainly applied to the semiconductor chip electric heating test core rod.
Description
Technical Field
The invention relates to the technical field of semiconductor chip testing, in particular to a manufacturing method of a semiconductor chip electrothermal testing core rod.
Background
With the continuous development of the packaged chip technology, the testing technology of the packaged chip also becomes an important technical key for ensuring the production quality and accelerating the production process in the electronic industry. Generally, the packaged chip needs to be electrically tested at a predetermined high temperature to know the stability of the packaged chip. Before the test of encapsulation chip, must heat the encapsulation chip, traditional heating methods is hot-blast through the heating wire formation with the air, then realizes on the rethread encapsulation chip the heating to the encapsulation chip, this kind of mode is because direct heating wire heating, easy electric leakage, it is unsafe, life is short, it is very inconvenient to operate, and need preheat the extravagant a large amount of times of process to lead to the whole preheating process of encapsulation semiconductor chip consuming time longer, reduce work efficiency.
Disclosure of Invention
The present invention is directed to a method for manufacturing a core bar for an electrothermal test of a semiconductor chip, so as to solve the problems of the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a manufacturing method of a semiconductor chip electrothermal test core rod is characterized in that: comprises the following steps of (a) preparing a solution,
S1: manufacturing a pipe, wherein one end of the pipe body is closed, and the other end of the pipe body is of an open structure;
s2: winding a heating alloy material outside the ceramic rod;
s3: inserting alloy wire material in the middle of the ceramic rod wound with the heating alloy material, and connecting a high-temperature wire to form a semi-finished product;
s4: making the heat transfer medium into hollow ceramic blocks with various shapes, and sleeving unequal numbers of hollow ceramic blocks into the semi-finished product of S3;
s6: selectively sleeving the high-temperature wire end of the semi-finished product into the sealing rubber part;
s7: inserting one end of the semi-finished product into the steel pipe;
s9: reducing the diameter of the steel pipe through equipment;
s10: polishing and grinding the steel pipe by using equipment;
as a preferred technical scheme of the invention: the length of the porcelain rod is 5-100 mm.
As a preferred technical scheme of the invention: after the step S9, the diameter of the steel pipe is 0.8 to 5.5 mm, and the length of the steel pipe is 10 to 120 mm.
As a preferred technical scheme of the invention: the length of the winding wire on the porcelain rod is 5-100 mm.
As a preferred technical scheme of the invention: the hollow porcelain blocks are replaced by the heat transfer medium in S4.
By adopting the technical scheme, the invention has the beneficial effects that: stainless steel is used as a core rod, alloy metal generates heat, and mineral magnesium oxide is used for heat transfer. When the temperature of the engine coolant is higher than a specified value, after the engine sends a signal, the heating alloy material in the heater assembly starts to work and generate heat, and the heat is transferred through the mineral magnesium oxide, so that the stainless steel shell generates heat finally. The heat is utilized to melt paraffin in the thermostat, the paraffin is melted to increase the volume, a rubber tube of the thermostat is compressed, the rubber tube is pressed to generate acting force on a core rod, a valve is opened, and cooling liquid directly enters into circulation.
Drawings
FIG. 1 is a schematic view showing an internal structure of a steel pipe;
FIG. 2 is a schematic structural view of a tube body according to the present invention;
fig. 3 is another structural schematic diagram of the tube of the present invention.
In the figure: 1. a pipe body; 2. a heat-generating alloy material; 3. high temperature line.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "upper surface", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1-3, the present invention provides the following embodiments:
example 1:
s1: selecting a stainless steel hollow pipe with the thickness of 0.5 mm and the length of 60 mm, sealing one end by adopting a welding process, and flanging the other end by using a lathe to form the pipe body 1. As shown in fig. 2.
S2: a ceramic rod with a length of 12 mm is selected, for example: a magnesium oxide rod, and a heat-generating alloy material 2, such as CR20NI80, CR15NI60, CR30NI70, CR20NI35, CR20NI32, CR25NI20, 2CR25NI20, 1CR25NI20SI2, OCR32NI13, OCR17NI12MO2, OCR19AL3, OCR25AL5, ICR13AL4, OCR21AL4, OCR21AL6, OCR27AL7, OCR27AL7MO2, OCR19AL3, OCR25AL5, ICR13AL4, OCR21AL4, OCR21AL6, OCR27AL7, OCR27AL7MO2, and/W,
S3: in two holes in the middle of the porcelain rod wound with the exothermic alloy material, 2 alloy wire materials were inserted, and high temperature wires were connected, for example: PFA copper high temperature line, PFA nickel high temperature line, PFA alloy high temperature line, PTFE copper high temperature line, PTFE nickel high temperature line, PTFE alloy high temperature line.
S4: sleeving a magnesium oxide U-shaped porcelain bottom on the head part of the porcelain rod wound and inserted with the wire in the previous process, and then sleeving magnesium oxide porcelain heads on the high-temperature wire, for example, sleeving three magnesium oxide porcelain heads, wherein the number of the magnesium oxide porcelain heads is determined according to the length of the porcelain rod which does not generate heat; finally, forming a semi-finished product;
S5: and sleeving the high-temperature wire end of the semi-finished product into the sealing rubber piece.
S6: and inserting the semi-finished product into the steel pipe, namely inserting the semi-finished product from the opening end of the steel pipe to the closed end of the steel pipe.
S7: using a shaker, adding magnesia powder into the steel tube, and filling the interior of the steel tube completely.
S8: the diameter is reduced by a pipe reducing device to reach the required diameter of 4.0 mm.
S9: and polishing and grinding by using a grinding machine.
S10: and polishing by using the grinding machine again to ensure that the brightness of the surface meets the requirement.
Example 2
S1: selecting a stainless steel plate with the thickness of 0.65 mm, stamping by adopting stamping equipment to form a hollow steel pipe with one end sealed and the other end provided with a bell mouth, wherein the diameter of the steel pipe is 5 mm, the length of the steel pipe is 100 mm, and the steel pipe is provided with the bell mouth; as shown in fig. 3.
S2: a ceramic rod with the length of 15m is selected, and a heating alloy material is wound on the outer portion of the ceramic rod.
S3: 106 high-temperature wires with insulating layers were selected, and the insulating layers of 35m length were pulled apart.
S4: the high temperature wire which is peeled is inserted into two holes in the middle of the porcelain rod which is wound with the heating alloy material.
S5: the head of the porcelain rod which is wound with wires and inserted with wires in the previous process is sleeved with a U-shaped magnesia porcelain bottom.
S6: then two sections of magnesia porcelain heads are sleeved on the high-temperature wire.
S7: and sleeving the high-temperature wire end of the semi-finished product into a sealing rubber piece.
S8: and inserting the semi-finished product into the steel pipe, namely inserting the semi-finished product from the opening end of the steel pipe to the closed end of the steel pipe.
S9: using a shaker, the magnesia powder was added into the steel tube and the inside was completely filled.
S10: the diameter is reduced by a pipe reducing device to reach the required outer diameter of 3.99 mm.
S11: and polishing and grinding by using a grinding machine.
S12: and polishing by using the grinding machine again to ensure that the brightness of the surface meets the requirement.
Example 3
S1: selecting a stainless steel plate with the thickness of 0.65 mm, stamping by using stamping equipment to form a hollow steel pipe with one end sealed and the other end smooth, wherein the diameter of the steel pipe is 5 mm, and the length of the steel pipe is 100 mm, as shown in figure 1.
S2: a ceramic rod with the length of 15 mm is selected, and a heating alloy material is wound on the outer portion of the ceramic rod.
S3: two metal wires are inserted into the ceramic rod and fixed.
S4: and welding a high-temperature wire at the outer end of the metal wire inserted into the porcelain rod.
S5: and a protective sleeve is sleeved outside the porcelain rod.
S6: the head of the porcelain rod which is wound with wires and inserted with wires in the previous process is sleeved with a U-shaped magnesia porcelain bottom.
S7: then two sections of magnesia porcelain heads are sleeved on the high-temperature wire.
S8: and sleeving the high-temperature wire end of the semi-finished product into the sealing rubber piece.
S9: and inserting the semi-finished product into the steel pipe, namely inserting the semi-finished product from the opening end of the steel pipe to the closed end of the steel pipe.
S10: using a shaker, the magnesia powder was added into the steel tube and the inside was completely filled.
S11: the diameter is reduced by a pipe reducing device to reach the required outer diameter of 3.99 mm.
S12, cutting a length of 67 mm by using a pipe cutting device.
S13: and polishing and grinding by using a grinding machine.
S14: and polishing by using the grinding machine again to ensure that the brightness of the surface meets the requirement.
Example 4
S1: selecting a stainless steel hollow pipe with the thickness of 0.5 mm and the length of 60 mm, sealing one end by adopting a welding process, and keeping the other end smooth and flat.
S2: a ceramic rod with the length of 12 mm is selected, and a heating alloy material is wound on the outer portion of the ceramic rod.
S3, inserting 2 alloy wire materials into two holes in the middle of the porcelain rod wound with the heating alloy material, and connecting with a high temperature wire.
S4: the head of the porcelain rod which is wound and inserted with wires in the previous working procedure is sleeved with a magnesium oxide U-shaped porcelain bottom, then a small magnesium oxide porcelain head is sleeved on the high-temperature wire, and four sections of magnesium oxide porcelain heads are sleeved according to the length of the non-heating length.
S5: and sleeving the high-temperature wire end of the semi-finished product into the sealing rubber piece.
S6: and inserting the semi-finished product into the steel pipe, namely inserting the semi-finished product into the closed end of the steel pipe from the open end of the steel pipe.
S7: using a shaker, the magnesium oxide powder was added into the steel tube and the inside was completely filled.
S8: the diameter is reduced by a pipe reducing device to reach the required diameter of 3.99 mm.
S9: and (5) polishing and grinding by using a grinding machine.
S10: and polishing by using the grinding machine again to ensure that the brightness of the surface meets the requirement.
Example 5
S1: selecting a steel pipe with the thickness of 0.65 mm.
S2: and (3) adopting a welding process, and carrying out sealing welding at one end.
S3: and sealing the welded part, and grinding and polishing.
S4: and turning the other smooth part of the other end of the steel pipe by using a lathe to turn the other smooth part into a horn shape.
S5: a ceramic rod with the length of 13 mm is selected,
s6: and winding a heating alloy material outside the ceramic rod.
S7: in two holes in the middle of the porcelain rod wound with the heating alloy material, 2 alloy wire materials are inserted and fixed.
S8: and the two alloy wires are externally welded with high temperature wires.
S9: the head of the porcelain rod which is wound with wires and inserted with wires in the previous working procedure is sleeved with a magnesia porcelain bottom.
S10: five sections of magnesia porcelain heads are sleeved on the outer part of the porcelain rod which is welded with a high-temperature wire.
S11: and sleeving the high-temperature wire end of the semi-finished product into the sealing rubber piece.
S12: and inserting the semi-finished product into the steel pipe, namely, inserting the semi-finished product from the flared end to the closed end of the steel pipe.
S13: using a shaker, the magnesia powder was added into the steel tube and the inside was completely filled.
S14: the diameter is reduced by a pipe reducing device to reach the required diameter of 3.99 mm.
S15: and polishing and grinding by using a grinding machine.
S16: and polishing by using the grinding machine again to ensure that the brightness of the surface meets the requirement.
Through the embodiment, the semiconductor chip electrothermal test core rod adopts stainless steel as the core rod, the alloy metal generates heat, and the mineral magnesium oxide is adopted for heat transfer, so that the deformation, embrittlement, cracking, electric leakage and explosion in long-time use are avoided, the semiconductor chip electrothermal test core rod can be normally used for a long time in the electrothermal test of the semiconductor chip, after the semiconductor chip electrothermal test core rod is electrified, the heating alloy material in the semiconductor chip electrothermal test core rod starts to work and generate heat, and the heat is transferred through the mineral magnesium oxide, so that the steel pipe body is finally formed, namely: the core bar generates heat, and the heat is utilized to enable the packaged chip to reach a preset high temperature for electrical test;
meanwhile, the electric heating wire commonly adopted by the semiconductor chip test is changed into the metal tubular semiconductor chip electric heating test core rod, and compared with the electric heating wire, the semiconductor chip electric heating test core rod has the advantages of difficult deformation, difficult embrittlement, difficult fracture, difficult electric leakage, difficult explosion and the like, and has longer service life, simple structure of the heating element, low cost and the like; certainly, because the stainless steel is used as the core bar, the alloy metal and the mineral magnesium oxide are integrated, the internal structure of the semiconductor chip electric heating tester is simpler, and the manufacturing difficulty and the cost of the semiconductor chip electric heating tester are reduced;
Furthermore, the steel pipe body is formed by pipe shrinkage according to actual use requirements, and the steel pipe has various connection modes of alloy heating materials and high-temperature wires, so that the steel pipe is good in use effect, various in operation connection mode, easy to operate, low in process requirement and easy to prepare;
in conclusion, the semiconductor chip electric heating test core rod has the advantages of simple manufacturing process, easily obtained raw materials, convenience in manufacturing, capability of replacing the traditional electric heating wire for heating, difficulty in deformation, embrittlement, breakage, electric leakage and explosion, longer service life and capability of prolonging the service life of a semiconductor chip tester.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (5)
1. A manufacturing method of a semiconductor chip electrothermal test core rod is characterized in that: comprises the following steps of (a) carrying out,
s1: manufacturing a pipe, wherein one end of the pipe body is closed, and the other end of the pipe body is of an open structure;
S2: winding a heating alloy material outside the porcelain rod;
s3: inserting alloy wire material in the middle of the ceramic rod wound with the heating alloy material, and connecting with a high temperature wire to form a semi-finished product;
s4: making the heat transfer medium into hollow ceramic blocks with various shapes, and sleeving unequal numbers of hollow ceramic blocks into the semi-finished product of S3;
s6: selectively sleeving the high-temperature wire end of the semi-finished product into the sealing rubber part;
s7: inserting one end of the semi-finished product into the steel pipe;
s9: reducing the diameter of the steel pipe through equipment;
s10: and polishing and grinding the steel pipe by using equipment.
2. The method of claim 1, wherein the step of forming the core pin comprises: the length of the porcelain rod is 5-100 mm.
3. The method of claim 1, wherein the step of forming the core pin comprises: after the step S9, the diameter of the steel pipe is 0.8 to 5.5 mm, and the length of the steel pipe is 10 to 120 mm.
4. A method of manufacturing a semiconductor chip electrothermal test core rod according to claim 1, 2 or 3, wherein: the length of the winding wire on the porcelain rod is 5-100 mm.
5. The method of claim 1, wherein the step of forming the core pin comprises: the hollow porcelain blocks are replaced by the heat transfer medium in S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210541419.2A CN114749873A (en) | 2022-05-17 | 2022-05-17 | Method for manufacturing semiconductor chip electrothermal test core rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210541419.2A CN114749873A (en) | 2022-05-17 | 2022-05-17 | Method for manufacturing semiconductor chip electrothermal test core rod |
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| CN114749873A true CN114749873A (en) | 2022-07-15 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4281451A (en) * | 1978-02-10 | 1981-08-04 | General Motors Corporation | Electric heater -method of making |
| CN101150895A (en) * | 2006-09-19 | 2008-03-26 | 陈国忠 | Making method for uniform electric heating tube |
| CN102528394A (en) * | 2011-12-27 | 2012-07-04 | 乐清市海狮电热电器制造有限公司 | Manufacturing method of electric heating push rod of electronic thermostat of engine |
| CN102536418A (en) * | 2011-12-27 | 2012-07-04 | 乐清市海狮电热电器制造有限公司 | Electro-thermal push bar for electronic thermostat of engine |
| DE102012109768A1 (en) * | 2012-10-12 | 2014-04-17 | Dbk David + Baader Gmbh | Radiator element for electric heater, for heating air current in combustion engine of motor vehicle, has fin element comprising curved corrugated fins that are electrically connected to contact element by screw made of hard material |
| CN105657873A (en) * | 2014-08-27 | 2016-06-08 | 陈亮 | Double-winding resistance wire and manufacture process for making same into heating tube |
| CN210491243U (en) * | 2019-08-16 | 2020-05-08 | 深圳市正大昌科技有限公司 | Novel electric heating tube |
| CN210579305U (en) * | 2019-05-06 | 2020-05-19 | 杭州佐帕斯工业有限公司 | Single-head electric heating tube with multi-section power split heating |
-
2022
- 2022-05-17 CN CN202210541419.2A patent/CN114749873A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4281451A (en) * | 1978-02-10 | 1981-08-04 | General Motors Corporation | Electric heater -method of making |
| CN101150895A (en) * | 2006-09-19 | 2008-03-26 | 陈国忠 | Making method for uniform electric heating tube |
| CN102528394A (en) * | 2011-12-27 | 2012-07-04 | 乐清市海狮电热电器制造有限公司 | Manufacturing method of electric heating push rod of electronic thermostat of engine |
| CN102536418A (en) * | 2011-12-27 | 2012-07-04 | 乐清市海狮电热电器制造有限公司 | Electro-thermal push bar for electronic thermostat of engine |
| DE102012109768A1 (en) * | 2012-10-12 | 2014-04-17 | Dbk David + Baader Gmbh | Radiator element for electric heater, for heating air current in combustion engine of motor vehicle, has fin element comprising curved corrugated fins that are electrically connected to contact element by screw made of hard material |
| CN105657873A (en) * | 2014-08-27 | 2016-06-08 | 陈亮 | Double-winding resistance wire and manufacture process for making same into heating tube |
| CN210579305U (en) * | 2019-05-06 | 2020-05-19 | 杭州佐帕斯工业有限公司 | Single-head electric heating tube with multi-section power split heating |
| CN210491243U (en) * | 2019-08-16 | 2020-05-08 | 深圳市正大昌科技有限公司 | Novel electric heating tube |
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Application publication date: 20220715 |
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