CN110072306A - Magnesium oxide column for electric heating tube and externally-wound electric heating tube - Google Patents
Magnesium oxide column for electric heating tube and externally-wound electric heating tube Download PDFInfo
- Publication number
- CN110072306A CN110072306A CN201910398297.4A CN201910398297A CN110072306A CN 110072306 A CN110072306 A CN 110072306A CN 201910398297 A CN201910398297 A CN 201910398297A CN 110072306 A CN110072306 A CN 110072306A
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- CN
- China
- Prior art keywords
- column
- magnesia
- electrothermal tube
- metal shell
- conductive rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
- H05B3/02—Details
-
- 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
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
Abstract
The invention discloses a magnesium oxide column for an electric heating tube, which adopts a cylindrical structure sintered by magnesium oxide powder, wherein the outer surface of the cylindrical structure is provided with a spiral external thread structure with uniform thread pitch, and two end faces of the cylindrical structure are respectively provided with a first step face and a second step face for connection; two parallel conductive rod holes are arranged on the vertical surface of the columnar structure; one end of the conductive rod hole is arranged on the first step surface, and the other end of the conductive rod hole is arranged on the second step surface. The invention also discloses the electrothermal tube comprising the magnesium oxide column, the magnesium oxide column can uniformly fix the resistance wire in the electrothermal tube, so that the phenomenon that the resistance wire generates heat unevenly due to dead weight and interval change under the condition that the resistance wire cannot be supported is avoided, and the electrothermal tube is arranged in the middle, so that the heat conduction efficiency of the electrothermal tube is improved, and the heating temperature is uniform.
Description
Technical field
The invention belongs to electric-heating technology fields, and in particular to the effective magnesia column of electric heating and outside around electrothermal tube.
Background technique
Electrothermal tube is tubular electrothermal element, is a kind of electric elements for specially converting electrical energy into thermal energy.It is with metal
Protecting pipe is shell (including stainless steel, copper tube), and central axial distributing auger lectrothermal alloy wire (close by nickel chromium triangle, siderochrome along pipe
Gold) magnesium oxide sand of its gap padding and compacting with good insulation heating conduction, nozzle both ends silica gel sealing, this metal electricity
Thermal element can heat air, fused salt, metal die and various liquid.Common electrothermal tube has Electrothermic tube with fins, Teflon electricity
Heat pipe, single-end electrothermal tube etc..It is easy for installation using simple, it is pollution-free, it is widely used in various heating occasions.
The powder technique of filling out of electrothermal tube is vertical operation, spiral resistance wire be arranged vertically in protecting pipe, due to spiral electricity
The own wt of resistance silk can generate sagging, and it is conventional protect in pipe fill out powder technique and be unable to control between the spiral of spiral resistance wire
Away from causing electrothermal tube fever uneven, hot-spot caused to influence product quality and service life.And conventional electrothermal tube fills out powder technique
Used in protect in pipe device, vibration fill out powder during it is difficult to ensure that spiral resistance wire precision placed in the middle, spiral resistance wire hold
Easy bias causes creepage distance between resistance wire and protecting pipe to reduce, and electrothermal tube insulation performance can not be suitable for high voltage, high temperature
Equal environment, urgent need want a technical solution to solve the problems, such as that spiral spacing of the resistance wire in electrothermal tube is unevenly and placed in the middle.
Summary of the invention
The purpose of the present invention is to solve the above problem, and provide the effective magnesia column of electric heating and outside around electrothermal tube.
The solution of the present invention is as follows: the effective magnesia column of electric heating, the column construction sintered into using magnesia powder, the column
The outer surface of shape structure is provided with the external thread structure of the uniform spiral of screw pitch, and column construction both ends of the surface are separately provided for connecting
The First terrace connect and second step face；There are two parallel conductive rod holes for setting on the longitudinal vertical plane of column construction；Institute
It states conductive rod hole one end to be arranged on First terrace, the other end is arranged on second step face.
Further, the magnesium post holes of amplification is additionally provided in the conductive rod hole being arranged on First terrace.
Further, the multiple arcs of uniform concentric same diameter are additionally provided on the outer surface of the column construction
Protrusion.
Further, the helicla flute of the external thread structure of column construction is arranged to rectangular groove structure or arc-shaped slot knot
Structure.
Further, the making step of magnesia column is as follows:
(1) magnesia powder by purity more than or equal to 90%, which pours into ball mill, grinds 48 hours；
(2) paraffin is poured into paraffin dissolving machine, is heated to 70-120 degrees Celsius, until paraffin is completely dissolved；
(3) magnesia powder after dissolved paraffin and grinding is put into high-speed mixer stirring according to the ratio of 3:17
It is even；
(4) by after mixing evenly paraffin and magnesia powder mixture be put into slip casting machine, slip casting is at magnesia column semi-finished product；
(5) molding magnesia column semi-finished product and alumina powder are mixed and is fitted into crucible, then crucible is put into
Become magnesia column finished product after firing 48 hours in 1280-1300 degrees Celsius of stove.
The present invention also invented outer around magnesia column single-end electrothermal tube, including protective metal shell pipe, oxygen including magnesia column
Change magnesium column, conductive rod and resistance wire；Adjacent magnesia column is cooperatively connected by First terrace and second step face；Two
In two parallel conductive rod holes that root conductive rod is inserted in magnesia column；The resistance wire is wrapped in the external screw thread of magnesia column
In the helicla flute of structure, the magnesia column after connection topmost and in the lowermost helicla flute does not wind resistance wire；Resistance wire with
Two conductive rods are connected into closed circuit, and electric current is entered and left from two conductive rods of the same end of protective metal shell pipe；Magnesia
Column is arranged in protective metal shell pipe after winding resistance wire, and magnesia powder filler is compacted in magnesia column and protective metal shell pipe
Between gap in, becoming after the non-power connection end sealing of protective metal shell pipe outside around magnesia column single-end electrothermal tube.
Further: outside in magnesia column single-end electrothermal tube, the upper end of the protective metal shell pipe is provided with diplopore insulation
Porcelain head, diplopore insulation porcelain head are provided with two through-holes passed through for conductive rod, the conductive rod of two through-holes and magnesia column
Hole is corresponding；The lower end of diplopore insulation porcelain head is arranged in protective metal shell pipe, and is pressed on magnesia column topmost.
Further: outside in magnesia column single-end electrothermal tube, the non-power connection end in lower end of the protective metal shell pipe is provided with
Back cover baffle, the back cover baffle are fixed on the bottom of protective metal shell pipe, and are pressed on magnesia column bottom.
The invention has the benefit that electrothermal tube of the invention, resistance wire can be uniformly fixed on electricity by magnesia column
In heat pipe, avoid resistance wire because self weight, spacing changes the case where cannot support, caused by fever it is uneven, and
It is centrally located, improves the heat transfer efficiency of electrothermal tube, heating temperature is uniform.
Detailed description of the invention
Fig. 1 is the schematic perspective view of 2 magnesia column of the embodiment of the present invention；
Fig. 2 is the schematic view of the front view of 2 magnesia column of the embodiment of the present invention；
Fig. 3 is the schematic cross-sectional view of 2 magnesia column A-A of the embodiment of the present invention；
Fig. 4 is 1 structural schematic diagram of embodiment of magnesia column of the present invention.
Fig. 5 is enlarged structure schematic diagram at the K of magnesia column of the present invention.
Fig. 6 is the outer structural schematic diagram around single-end electrothermal tube of the present invention.
Fig. 7 is the outer enlarged structure schematic diagram at the H of single-end electrothermal tube of the present invention.
Fig. 8 is the outer enlarged structure schematic diagram at the G of single-end electrothermal tube of the present invention.
Fig. 9 is the outer enlarged structure schematic diagram at the D of single-end electrothermal tube of the present invention.
Figure 10 is the outer enlarged structure schematic diagram at the B of single-end electrothermal tube of the present invention.
Figure 11 is the schematic cross-sectional view of the outer C-C around single-end electrothermal tube of the present invention.
Wherein: 1, diplopore insulation porcelain head；2, protective metal shell pipe；3, magnesia column；4, conductive rod；5, resistance wire；6, back cover
Baffle；7, magnesia powder filler；31, external screw thread；32, First terrace；33, second step face；34, conductive rod hole；35, magnesium
Post holes；36, arcuate projections；311, rectangular groove structure；312, arc-shaped slot structure.
Specific embodiment
The present invention will be further described by Fig. 1 to Figure 11 with reference to the accompanying drawings of the specification.
Embodiment 1
As shown in Figures 2 to 4, the effective magnesia column 3 of electric heating, the column construction sintered into using magnesia powder, the column
The outer surface of shape structure is provided with 31 structure of external screw thread of the uniform spiral of screw pitch, and column construction both ends of the surface are separately provided for
The First terrace 32 of connection and second step face 33；The formation of external screw thread 31 after First terrace 32 and second step face 33 are docked
One continuous, complete, uniform helical structure.There are two parallel conductive rod holes for setting on the longitudinal vertical plane of column construction
34；Described 34 one end of conductive rod hole is arranged on First terrace 32, and the other end is arranged on second step face 33.The structure is set
Setting can guarantee that spacing of the resistance wire 5 in electrothermal tube is stablized, and heating effect is uniform, local temperature mistake when electrothermal tube being avoided to heat
Height can significantly improve the service life of electrothermal tube, and the structure of the electrothermal tube is easy to produce, installation.
Embodiment 2
As shown in Fig. 1 to Fig. 3 and Fig. 5, the effective magnesia column 3 of electric heating, the column construction sintered into using magnesia powder, institute
The outer surface for stating column construction is provided with 31 structure of external screw thread of the uniform spiral of screw pitch, and column construction both ends of the surface are respectively arranged with
First terrace 32 and second step face 33 for connection；It is parallel there are two being arranged on the longitudinal vertical plane of column construction to lead
Torch hole 34；Described 34 one end of conductive rod hole is arranged on First terrace 32, and the other end is arranged on second step face 33.If
Set the magnesium post holes 35 that amplification is additionally provided in the conductive rod hole 34 on First terrace 32, the purpose of enlarged opening is to allow electricity
It when resistance silk 5 is wrapped on conductive rod 4, can put into magnesia column 3, First terrace 32 and second step face 33 connect
Reserving gaps afterwards, magnesia powder can fill up two 3 junctions of magnesia column by the gap when conveniently filling out powder.The column construction
Outer surface on be additionally provided with the multiple arcs protrusion 36 of uniform concentric same diameter, convenient for magnesia column 3 in electric heating
It is placed in the middle in pipe, guarantee the spacing of 2 inside of protective metal shell pipe in magnesia column 3 and electrothermal tube.The external screw thread 31 of column construction
The helicla flute of structure be arranged to rectangular groove structure 311 perhaps arc-shaped slot structure 312 can be adapted for round resistance wire 5 or
Flat resistance wire 5.
Embodiment 3
The making step of the magnesia column of the application is as follows:
(1) magnesia powder by purity more than or equal to 90%, which pours into ball mill, grinds 48 hours；
(2) paraffin is poured into paraffin dissolving machine, is heated to 70-120 degrees Celsius, until paraffin is completely dissolved；
(3) magnesia powder after dissolved paraffin and grinding is put into high-speed mixer stirring according to the ratio of 3:17
It is even；
(4) by after mixing evenly paraffin and magnesia powder mixture be put into slip casting machine, slip casting is at magnesia column semi-finished product；
(5) being put into molding magnesia column semi-finished product after firing 48 hours in 1280-1300 degrees Celsius of stove becomes
Magnesia column finished product.
Embodiment 4
As shown in Fig. 6 to Figure 11, the present invention also invented it is outer around magnesia column single-end electrothermal tube including magnesia column 3,
Including protective metal shell pipe 2, magnesia column 3, conductive rod 4 and resistance wire 5；Adjacent magnesia column 3 passes through 32 He of First terrace
Second step face 33 is cooperatively connected；In two parallel conductive rod holes 34 that two conductive rods 4 are inserted in magnesia column 3；
The resistance wire 5 is wrapped in the helicla flute of 31 structure of external screw thread of magnesia column 3,3 the top of magnesia column after connection and
Resistance wire 5 is not wound in the lowermost helicla flute, thus reach conductive to resistance wire 5, and conductive rod itself does not generate heat, and controls cold
Hold distance；Resistance wire 5 and two conductive rods 4 are connected into closed circuit, two piece conductions of the electric current from the same end of protective metal shell pipe 2
Stick 4 is entered and left；Magnesia column 3 is arranged in protective metal shell pipe 2 after winding resistance wire 5, and magnesia powder filler is compacted
In gap between magnesia column 3 and protective metal shell pipe 2, outside becoming after the non-power connection end glue sealing of protective metal shell pipe 2
Around magnesia column single-end electrothermal tube, the material of the glue is the AB glue water of 704 glue of silicon rubber and HARDMAN company, the U.S.；
The component A model of the AB glue water of HARDMAN company, the U.S. is adhesive HARDMAN 46717, and B component model is adhesive
HARDMAN 56717, A and B component use after mixing according to 1:1；The AB glue water elder generation Feng Yici of U.S. HARDMAN company is first used,
Again 704 glue sealing of silicon rubber to AB glue water surface；It is first done using the AB glue water of HARDMAN company and is sealed for the first time, the AB
Sealing performance is outstanding after glue curing, after electrothermal tube uses the glue sealing, is placed in the sink of 1.5 meters of depths and takes after 24 hours
Out, test insulation resistance is without decline after nozzle air-dries.But it is very rigid after the AB glue water cure, to avoid using or transporting
Capillary crack is generated after vibrating on the way, influences sealing performance, so being poured again after the AB glue water-stop of HARDMAN company primary
704 glue of silicon rubber, good toughness after 704 glue curing of silicon rubber, after vibration will not product crack, can be very good to make up
The AB glue water disadvantage of HARDMAN company, two kinds of glue are used cooperatively the sealing performance and ageing-resistant performance that can guarantee electrothermal tube,
And electrical insulation capability is good.Outside in magnesia column single-end electrothermal tube, the upper end of the protective metal shell pipe 2 is provided with diplopore insulation
Porcelain head 1, diplopore insulation porcelain head 1 are provided with two through-holes passed through for conductive rod 4, and two through-holes are led with magnesia column 3
Torch hole 34 is corresponding；The lower end of diplopore insulation porcelain head 1 is arranged in protective metal shell pipe 2, and it is most upper to be pressed on magnesia column 3
End.Outside in magnesia column single-end electrothermal tube, the lower end of the protective metal shell pipe is provided with back cover baffle 6, the back cover baffle 6
It is fixed on the bottom of protective metal shell pipe 2, and is pressed on 3 bottom of magnesia column.It, can resistance wire is equal by magnesia column 3
Even is fixed in electrothermal tube, avoids resistance wire 5 because self weight, spacing changes the case where cannot support, and causes electricity
Heat pipe fever is uneven, and magnesia column 3 can guarantee that spiral resistance wire 5 is centrally located, effective to resist the vibration influence for filling out powder,
It ensure that stability placed in the middle when filling out powder, the precision placed in the middle of spiral resistance wire 5 greatly improved, increase spiral resistance wire 5 and gold
Belong to the creepage distance between protecting pipe 2, the insulation performance of electrothermal tube is greatly improved.
Although the detailed description and description of the specific embodiments of the present invention are given above, it should be noted that
We can carry out various equivalent changes and modification to above embodiment according to the concept of the present invention, and generated function is made
It, should all be within protection scope of the present invention when with the spirit still covered without departing from specification.
Claims (8)
1. the effective magnesia column of electric heating, which is characterized in that the column construction sintered into using magnesia powder, the column construction
Outer surface is provided with the external thread structure of the uniform spiral of screw pitch, and column construction both ends of the surface are separately provided for the first of connection
Step surface and second step face；There are two parallel conductive rod holes for setting on the longitudinal vertical plane of column construction；The conductive rod
Hole one end is arranged on First terrace, and the other end is arranged on second step face.
2. the effective magnesia column of electric heating according to claim 1, which is characterized in that the conduction on First terrace is arranged in
The magnesium post holes of amplification is additionally provided in stick hole.
3. the effective magnesia column of electric heating according to claim 1, which is characterized in that on the outer surface of the column construction also
It is provided with the multiple arcs protrusion of uniform concentric same diameter.
4. the effective magnesia column of electric heating according to claim 1, which is characterized in that the spiral shell of the external thread structure of column construction
Spin slot is arranged to rectangular groove structure or arc-shaped slot structure.
5. the effective magnesia column of electric heating as described in claim 1, which is characterized in that the making step of magnesia column is as follows:
(1) magnesia powder by purity more than or equal to 90%, which pours into ball mill, grinds 48 hours；
(2) paraffin is poured into paraffin dissolving machine, is heated to 70-120 degrees Celsius, until paraffin is completely dissolved；
(3) magnesia powder after dissolved paraffin and grinding high-speed mixer is put into according to the ratio of 3:17 to stir evenly；
(4) by after mixing evenly paraffin and magnesia powder mixture be put into slip casting machine, slip casting is at magnesia column semi-finished product；
(5) being put into molding magnesia column semi-finished product after firing 48 hours in 1280-1300 degrees Celsius of stove becomes oxidation
Magnesium column finished product.
6. a kind of outer around magnesia column single-end electrothermal tube, it is characterised in that: including protective metal shell pipe, magnesia column, conductive rod and
Resistance wire；Adjacent magnesia column is cooperatively connected by First terrace and second step face；Two conductive rods are inserted in oxygen
Change in two parallel conductive rod holes in magnesium column；The resistance wire is wrapped in the helicla flute of the external thread structure of magnesia column
In, the magnesia column after connection topmost and in the lowermost helicla flute does not wind resistance wire；Resistance wire and two conductive rod strings
It is unified into closed circuit, electric current is entered and left from two conductive rods of the same end of protective metal shell pipe；Magnesia column winds resistance wire
After be arranged in protective metal shell pipe, and magnesia powder filler is compacted gap between magnesia column and protective metal shell pipe
In, become after the non-power connection end of protective metal shell pipe is sealed outside around magnesia column single-end electrothermal tube.
7. according to claim 6 a kind of outer around magnesia column single-end electrothermal tube, it is characterised in that: the protective metal shell pipe
Upper end be provided with diplopore insulation porcelain head, diplopore insulation porcelain head is provided with two through-holes passed through for conductive rod, and two are described logical
Hole is corresponding with the conductive rod hole of magnesia column；The lower end of diplopore insulation porcelain head is arranged in protective metal shell pipe, and is pressed on oxygen
Change magnesium column topmost.
8. according to claim 6 a kind of outer around magnesia column single-end electrothermal tube, it is characterised in that: the protective metal shell pipe
Non- power connection end be provided with back cover baffle, the back cover baffle is fixed on the bottom of protective metal shell pipe, and is pressed on magnesia column
Bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910398297.4A CN110072306B (en) | 2019-05-14 | 2019-05-14 | Externally-wound magnesium oxide column single-head electric heating tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910398297.4A CN110072306B (en) | 2019-05-14 | 2019-05-14 | Externally-wound magnesium oxide column single-head electric heating tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110072306A true CN110072306A (en) | 2019-07-30 |
| CN110072306B CN110072306B (en) | 2022-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910398297.4A Active CN110072306B (en) | 2019-05-14 | 2019-05-14 | Externally-wound magnesium oxide column single-head electric heating tube |
Country Status (1)
| Country | Link |
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| CN (1) | CN110072306B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111182665A (en) * | 2019-12-27 | 2020-05-19 | 镇江陆陆电气有限公司 | Explosion-proof resistance wire, explosion-proof resistance wire heating pipe and manufacturing process thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008014691A1 (en) * | 2006-07-28 | 2008-02-07 | Mingfeng You | Heater |
| CN201134940Y (en) * | 2007-11-20 | 2008-10-15 | 王晓峰 | Electric heating tube |
| CN203399315U (en) * | 2013-07-18 | 2014-01-15 | 广州市益德电热制品有限公司 | Spiral type instant heating tube |
| CN107417260A (en) * | 2017-09-06 | 2017-12-01 | 盐城市华康电热绝缘材料厂 | The hot pressing method for preparing of magnesia ceramics |
| CN208094819U (en) * | 2018-04-27 | 2018-11-13 | 江苏顺发电热材料有限公司 | A kind of double-layer structure electrothermal tube |
-
2019
- 2019-05-14 CN CN201910398297.4A patent/CN110072306B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008014691A1 (en) * | 2006-07-28 | 2008-02-07 | Mingfeng You | Heater |
| CN201134940Y (en) * | 2007-11-20 | 2008-10-15 | 王晓峰 | Electric heating tube |
| CN203399315U (en) * | 2013-07-18 | 2014-01-15 | 广州市益德电热制品有限公司 | Spiral type instant heating tube |
| CN107417260A (en) * | 2017-09-06 | 2017-12-01 | 盐城市华康电热绝缘材料厂 | The hot pressing method for preparing of magnesia ceramics |
| CN208094819U (en) * | 2018-04-27 | 2018-11-13 | 江苏顺发电热材料有限公司 | A kind of double-layer structure electrothermal tube |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111182665A (en) * | 2019-12-27 | 2020-05-19 | 镇江陆陆电气有限公司 | Explosion-proof resistance wire, explosion-proof resistance wire heating pipe and manufacturing process thereof |
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| Publication number | Publication date |
|---|---|
| CN110072306B (en) | 2022-05-13 |
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Effective date of registration: 20220418 Address after: 238301 No. 4, Jingsi Road, Wuwei Economic Development Zone, Wuwei City, Wuhu City, Anhui Province Applicant after: Anhui Yuansi Electric Co.,Ltd. Address before: 238335 Nanhu administrative village, YAOGOU Town, Wuwei County, Wuhu City, Anhui Province Applicant before: Anhui Centimeter Photoelectric Thermal Technology Co.,Ltd. |
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