CN110087352B - Electric heating tube - Google Patents
Electric heating tube Download PDFInfo
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- CN110087352B CN110087352B CN201910398270.5A CN201910398270A CN110087352B CN 110087352 B CN110087352 B CN 110087352B CN 201910398270 A CN201910398270 A CN 201910398270A CN 110087352 B CN110087352 B CN 110087352B
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- magnesium oxide
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- oxide column
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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
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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
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
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Abstract
The invention discloses an electric heating tube which comprises an incoming line bank, a central conducting rod, a spiral resistance wire and an outgoing line bank; a first cold-end magnesium oxide column, a middle-protection magnesium oxide column and a second cold-end magnesium oxide column are arranged in the metal protecting sleeve; the first cold-end magnesium oxide column and the second cold-end magnesium oxide column are coaxially arranged above and below the middle magnesium oxide column respectively; the inner wall of the magnesium oxide column is provided with a circular ring sheet which is integrally in a spiral structure; the central conducting rod is arranged in the outgoing conducting pipe in a penetrating way in the middle; the lower end and the upper end of the central conducting rod are respectively connected with a resistance wire connecting piece and an incoming wire connecting bar; the outgoing line conductive tube is connected with an outgoing line wiring bank; the upper end of the spiral resistance wire is electrically connected with the outgoing conductive tube, the lower end of the spiral resistance wire is electrically connected with the resistance wire connecting piece, and the other part of the spiral resistance wire is spirally arranged on the circular ring piece on the inner wall of the magnesium oxide column. The electric heating tube ensures that the longitudinal pitches of the spiral resistance wires are consistent, is arranged between two sides, improves the heat conduction efficiency of the electric heating tube, and has uniform heating temperature.
Description
Technical Field
The invention belongs to the technical field of electric heating, and particularly relates to an electric heating tube.
Background
The electrothermal tube is a tubular electrothermal element, and is an electrical element specially used for converting electric energy into heat energy. It uses metal protecting sleeve as shell (including stainless steel and red copper tube), along the central axial of the tube uniformly distributed spiral electrothermal alloy wires (nickel-chromium and iron-chromium alloy) and its gap is filled and compacted with magnesia sand with good insulating and heat-conducting properties, and its two ends of tube mouth are sealed by silica gel, and said metal electrothermal element can be used for heating air, molten salt, metal mould and various liquids. Common electric heating tubes include a fin electric heating tube, a Teflon electric heating tube, a single-head electric heating tube and the like. Simple use, convenient installation and no pollution, and is widely used in various heating occasions.
The powder filling process of the electric heating tube is operated vertically, the spiral resistance wire is vertically arranged in the protective sleeve, and the self weight of the spiral resistance wire can generate a droop phenomenon, while the conventional protective sleeve powder filling process can not control the spiral distance of the spiral resistance wire, so that the electric heating tube generates uneven heat, and local overheating is caused to influence the product quality and the service life. And the guarantee well pipe device that uses among the conventional electrothermal tube powder filling technology hardly guarantees the precision placed in the middle of the spiral resistance wire at the vibration powder filling in-process, and the spiral resistance wire is easy off-centre to lead to creepage distance between resistance wire and the protecting pipe to reduce, and electrothermal tube insulating properties can't be applicable to environment such as high voltage, high temperature, urgently need a technical scheme to solve the problem that the spiral interval of resistance wire in the electrothermal tube is uneven and placed in the middle.
Disclosure of Invention
The present invention is directed to solving the above problems and to providing an electric heating tube.
The scheme of the invention is as follows: the electric heating tube comprises an incoming line bank, a central conductive rod, a spiral resistance wire, an outgoing line conductive tube, a metal sheath tube and an outgoing line bank; a first cold-end magnesium oxide column, a middle-protection magnesium oxide column and a second cold-end magnesium oxide column are arranged in the middle of the metal sheath tube; the first cold-end magnesium oxide column and the second cold-end magnesium oxide column are coaxially arranged above and below the middle magnesium oxide column respectively; the inner wall of the middle-protection magnesium oxide column is processed with uniform circular ring sheets; the whole circular ring piece is of a spiral structure, and the thread pitches are uniform; the central conducting rod is arranged in the outgoing conducting pipe in a penetrating manner in the middle; the lower end of the central conducting rod is arranged in the second cold-end magnesium oxide column; the upper end of the central conductive rod is exposed, and the upper end of the central conductive rod is connected with an incoming line wiring bar; the outgoing line conductive tube is connected with an outgoing line wiring bank; the upper end of the spiral resistance wire is electrically connected with the outgoing line conductive tube, the lower end of the spiral resistance wire is electrically connected with the lower end of the central conductive rod, other parts of the spiral resistance wire are spirally arranged on a circular ring piece forming a spiral structure on the inner wall of the magnesium oxide column, and the other parts of the spiral resistance wire sequentially enter the incoming line wiring bar, the central conductive rod, the lower end of the spiral resistance wire, the upper end of the spiral resistance wire, the outgoing line conductive tube and the outgoing line wiring bar through a power supply to form a closed loop.
Furthermore, an upper insulating ceramic tube is arranged above the outgoing line conductive tube; the outer surface of the outgoing line conductive tube is provided with a lower insulating ceramic tube; the lower end of the lower insulating porcelain tube is in butt joint with the first cold-end magnesium oxide column and the upper surface of the metal protective sleeve to form a sealing structure.
Further, go up the insulating porcelain pipe and the same with lower insulating porcelain pipe structure, be provided with the chamfer in going up the hole of insulating porcelain pipe upper surface, the lower surface is provided with the step, and this structure is provided with and benefits in connecting and sealing up with glue.
Furthermore, an insulating filler is arranged in a gap between the central conducting rod and the outgoing line conducting tube; the lower end of the central conducting rod is connected with a resistance wire connecting piece; the lower end of the spiral resistance wire is electrically connected with the lower end of the central conductive rod through a resistance wire connecting piece.
Furthermore, an insulating ceramic column is arranged on the outer surface of the central conducting rod; the insulating ceramic column is sleeved on the central conducting rod, the upper surface of the insulating ceramic column is positioned at the lower end of the step of the upper insulating ceramic tube, and the lower surface of the insulating ceramic column is connected to the lower end of the central conducting rod.
Furthermore, the insulating ceramic column is formed by sequentially connecting a plurality of insulating ceramic column monomers; be provided with the concave recess in the hole of insulating ceramic post monomer upper surface, insulating ceramic post monomer lower surface is provided with the bulge with the butt joint of concave recess, and insulating ceramic post monomer is convenient for process production, and it is also convenient to install, has reduced manufacturing cost and the degree of difficulty of processing.
Furthermore, glue is arranged in a gap between the butt joint part of the upper insulating ceramic tube and the outgoing line conductive tube, and glue is arranged in a gap between the butt joint part of the lower insulating ceramic tube and the metal protecting sleeve.
Further, the glue is made of silicone rubber 704 glue and AB glue of the American HARDMAN company; the A component of AB glue of the American HARDMAN company is adhesive HARDMAN 46717, the B component is adhesive HARDMAN 56717, the A component and the B component are mixed according to the ratio of 1:1 and then used, the AB glue of the American HARDMAN company is firstly sealed once, and then the silicon rubber 704 glue is sealed on the surface of the AB glue.
Further, a metal sealing sheet is arranged at the lower end of the second cold-end magnesium oxide column; and the metal sealing sheet is fixed in the metal protective sleeve, and the lower surface of the metal protective sleeve is sealed with the lower end of the second cold-end magnesium oxide column.
Furthermore, a spiral groove is formed in the outer wall of the lower end of the outgoing conductive tube; the upper end of the spiral resistance wire is spirally arranged in the spiral groove and is electrically fixed with the outgoing line conductive tube.
Furthermore, the lower end of the outgoing conductive tube is positioned above the lower end of the first cold-end magnesium oxide column.
Furthermore, the other gaps in the metal sheath pipe are filled with compacted magnesia powder.
Furthermore, the spiral resistance wire adopts a round resistance wire or a flat resistance wire.
Furthermore, the middle magnesium oxide column, the first cold-end magnesium oxide column and the second cold-end magnesium oxide column are formed by combining two semi-cylinders left and right; a first inclined plane is arranged on the semi-cylinder of the middle-protection magnesium oxide cylinder; and the semi-cylinders of the first cold-end magnesium oxide column and the second cold-end magnesium oxide column are provided with second inclined planes.
The invention has the beneficial effects that: according to the electric heating tube, the structure design of the magnesium oxide column at the middle protection end, the magnesium oxide column at the first cold end and the magnesium oxide column at the second cold end can uniformly fix the spiral resistance wire in the electric heating tube, so that the phenomenon that the electric heating tube generates heat unevenly due to the fact that the spiral resistance wire is subjected to self weight and the interval changes under the condition that the support cannot be obtained is avoided. The spiral resistance wire is arranged in the middle, so that the consistency of the longitudinal pitch of the spiral resistance wire is ensured, the stability of resisting powder filling vibration is good, the centering precision of the spiral resistance wire is greatly improved, the creepage distance between the spiral resistance wire and the protective sleeve is increased, the insulating property of the electric heating tube is greatly improved, the service life of the electric heating tube can be greatly prolonged to 6-8 years, and meanwhile, the production cost is one fourth of that of a common electric heating tube in the market.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic diagram of the wire structure of the spiral resistance wire of the present invention;
FIG. 3 is a schematic cross-sectional view of a magnesium oxide column according to the present invention;
FIG. 4 is a schematic perspective view of a cold-end magnesia column according to the present invention.
FIG. 5 is an enlarged view at H of the present invention.
FIG. 6 is a schematic view of the connection of the insulating ceramic posts to the central conductive rod.
Fig. 7 is a schematic view of the structure of the insulating ceramic column unit.
Fig. 8 is a schematic structural view of an upper porcelain insulator tube and a lower porcelain insulator tube.
Wherein: 1. a wire inlet and wiring row; 2. a central conductive rod; 3. an upper insulating ceramic tube; 4. an outgoing line conductive tube; 5. an insulating filler; 6. an outgoing line bank; 7. a lower insulating porcelain tube; 8. a first cold-end magnesium oxide column; 9. a helical resistance wire; 10. a magnesium oxide column is preserved; 11. a metal sheath tube; 12. a resistance wire connector; 13. a second cold-end magnesium oxide column; 14. a metal sealing sheet; 15. an insulating ceramic post; 16. a step; 41. a helical groove; 101. a first inclined surface; 102. a ring piece; 131. a second inclined surface; 151. insulating ceramic post monomer.
Detailed Description
The invention is further described with reference to figures 1 to 8 of the accompanying drawings.
Example 1
As shown in fig. 1 to 8, the electric heating tube of the present invention comprises an incoming line bank 1, a central conductive rod 2, a spiral resistance wire 9, an outgoing line conductive tube 4, a metal sheath tube 11 and an outgoing line bank 6; a first cold-end magnesium oxide column 8, a middle-protection magnesium oxide column 10 and a second cold-end magnesium oxide column 13 are arranged in the middle of the metal protecting sleeve 11; the first cold-end magnesia column 8 and the second cold-end magnesia column 13 are respectively coaxially arranged above and below the middle magnesia column 10; the inner wall of the middle-protection magnesium oxide column 10 is processed with uniform circular ring sheets 102; the whole circular ring piece 102 is of a spiral structure, and the thread pitches are uniform; the central conducting rod 2 is arranged in the outgoing line conducting tube 4 in a penetrating manner in the middle; the lower end of the central conducting rod 2 is arranged in the second cold-end magnesium oxide column 13; the upper end of the central conducting rod 2 is exposed, and the upper end of the central conducting rod 2 is connected with an incoming line wiring bar 1; the outgoing line conductive tube 4 is connected with an outgoing line wiring bar 6; the upper end of the spiral resistance wire 9 is electrically connected with the outgoing conductive tube 4, the lower end of the spiral resistance wire is electrically connected with the lower end of the central conductive rod 2 through spot welding or argon arc welding, other parts of the spiral resistance wire 9 are spirally arranged on a circular sheet 102 which is arranged on the inner wall of the central magnesium oxide column 10 and is of a spiral structure, the magnesium oxide column 10 and the circular sheet 102 are made of the same material, and a power supply sequentially enters the incoming wiring bar 1, the central conductive rod 2, the lower end of the spiral resistance wire 9, the upper end of the spiral resistance wire 9, the outgoing conductive tube 4 and the outgoing wiring bar 6 to form a closed loop. Of the magnesium oxide column 10, the first cold-end magnesium oxide column 8 and the second cold-end magnesium oxide column 13 of the present inventionStructural design can be even fix spiral resistance wire 9 in the electrothermal tube, avoid spiral resistance wire 9 because of the dead weight, the condition interval that can not obtain the support changes, and the heat conduction temperature that causes is inhomogeneous, and spiral resistance wire 9 precision is high between two parties, it is good to resist the stability of powder vibration of filling in addition, has increased the creepage distance between spiral resistance wire 9 and metal sheathing pipe 11, has increased substantially the electrical insulation performance of electrothermal tube to
For example, after the electric heating tube is filled with powder and contracted in a conventional tube-protecting mode, a voltage resistance tester is used for detecting the centering degree of the spiral resistance wire, the voltage withstand voltage value test result generally does not exceed 3500V/min, if the electric heating tube of the same specification is adopted by the scheme of the invention, the voltage withstand voltage value is 7200V/min, the qualification rate is not lower than 99.3%, and the electric heating tube is greatly superior to the conventional products in the market.
Furthermore, an upper insulating ceramic tube 3 is arranged above the outgoing line conductive tube 4, so that the insulativity of the electric heating tube is ensured.
Further, a lower insulating porcelain tube 7 is arranged on the outer surface of the outgoing line conductive tube 4; the lower end of the lower insulating porcelain tube 7 is connected with the upper surfaces of the first cold-end magnesium oxide column 8 and the metal protecting sleeve 11 to form a sealing structure, so that the sealing and insulating effects are achieved. The upper insulating ceramic tube 3 and the lower insulating ceramic tube 7 are made of a nine-five alumina ceramic material, so that the insulating ceramic tube has the characteristics of high temperature resistance, high mechanical strength, good insulating property, high electric strength and good chemical stability, and the product made of the material has accurate overall dimension.
Furthermore, an insulating filler 5 is arranged in a gap between the central conductive rod 2 and the outgoing conductive tube 4, and the insulating filler is generally made of magnesium oxide powder, so that the insulating property and the heat conduction efficiency of the electric heating tube are improved better.
Further, a metal sealing sheet 14 is arranged at the lower end of the second cold-end magnesium oxide column 13; the metal sealing sheet 14 is fixed in the metal protecting sleeve 11, and the lower surface of the metal protecting sleeve 11 is sealed with the lower end of the second cold-end magnesium oxide column 13, so that the sealing performance of the whole metal electric heating tube is ensured.
Further, a spiral groove 41 is arranged on the outer wall of the lower end of the outgoing line conductive tube 4; the upper end of the spiral resistance wire 9 is spirally arranged in the spiral groove 41 and is electrically fixed with the outgoing conductive tube 4, and the upper end of the spiral resistance wire 9 is welded in the spiral groove 41, so that good contact is ensured.
Further, the lower end of the outgoing conductive tube 4 is positioned above the lower end of the first cold-end magnesium oxide column 8.
Furthermore, the place in other clearances in the metal protecting sleeve 11 is filled with compacted magnesia powder, so that the electrical insulation is ensured, and the heat conduction efficiency is improved.
Furthermore, the spiral resistance wire 9 adopts a round resistance wire or a flat resistance wire, the spiral resistance wire 9 can be single-stranded or multi-stranded, if the flat resistance wire is adopted, the flat resistance wire with very thin thickness can be used in the structure of the electric heating tube, and the thickness can reach 0.05 mm, so that the creepage distance from the outer diameter of the flat resistance wire to the inner wall of the metal sheath tube is increased, and the electric heating tube with higher voltage level can be designed.
Further, the middle magnesium oxide column 10, the first cold-end magnesium oxide column 8 and the second cold-end magnesium oxide column 13 are formed by combining two semi-cylinders left and right; a first inclined surface 101 is arranged on a semi-cylinder of the middle-protection magnesium oxide cylinder 10; and the semi-cylinders of the first cold-end magnesium oxide column 8 and the second cold-end magnesium oxide column 13 are provided with second inclined planes 131. The structural design of semicircle column can be convenient for install, and the structural design of first inclined plane 101 and second inclined plane 131 makes when filling the powder, has increased the circulation space of magnesium oxide powder, promotes the circulation, and the installation back adds the magnesium oxide powder and fills, then contracts the pipe, reaches better sealed effect, also makes the processing degree of difficulty greatly reduced.
Example 2
As shown in fig. 1 to 4, the electric heating tube of the present invention comprises an incoming line bank 1, a central conductive rod 2, a spiral resistance wire 9, an outgoing line conductive tube 4, a metal sheath tube 11 and an outgoing line bank 6; a first cold-end magnesium oxide column 8, a middle-protecting magnesium oxide column 10 and a second cold-end magnesium oxide column 13 are arranged in the middle of the metal protecting sleeve 11; the first cold-end magnesia column 8 and the second cold-end magnesia column 13 are respectively coaxially arranged above and below the middle magnesia column 10; the inner wall of the middle-protection magnesium oxide column 10 is processed with uniform circular ring sheets 102; the whole circular ring piece 102 is of a spiral structure, and the thread pitches are uniform; the central conducting rod 2 is arranged in the outgoing conducting tube 4 in a penetrating manner in the middle; the lower end of the central conducting rod 2 is arranged in the second cold-end magnesium oxide column 13, and the lower end of the central conducting rod 2 is connected with a resistance wire connecting piece 12; the upper end of the central conducting rod 2 is exposed, and the upper end of the central conducting rod 2 is connected with an incoming line wiring bar 1; the outgoing line conductive tube 4 is connected with an outgoing line wiring bar 6; the upper end of the spiral resistance wire 9 is electrically connected with the outgoing line conductive tube 4, the lower end of the spiral resistance wire is electrically connected with the resistance wire connecting piece 12, the resistance wire connecting piece 12 is sleeved on the head of the spiral resistance wire 9 and is locked with the spiral resistance wire 9 after stamping, the connection is stable, poor contact is prevented, the spiral resistance wire and the central conductive rod are connected together in a welding mode, other parts of the spiral resistance wire 9 are spirally arranged on a circular ring piece 102 which is in a spiral structure and is arranged on the inner wall of the magnesium oxide column 10 in the center, the parts sequentially enter the incoming line wiring bar 1, the central conductive rod 2, the resistance wire connecting piece 12, the lower end of the spiral resistance wire 9, the upper end of the spiral resistance wire 9, the outgoing line conductive tube 4 and the outgoing line wiring bar 6 to form a closed loop.
Example 3
As shown in fig. 1 to 8, the electric heating tube of the present invention comprises an incoming line bank 1, a central conductive rod 2, a spiral resistance wire 9, an outgoing line conductive tube 4, a metal sheath tube 11 and an outgoing line bank 6; a first cold-end magnesium oxide column 8, a middle-protection magnesium oxide column 10 and a second cold-end magnesium oxide column 13 are arranged in the middle of the metal protecting sleeve 11; the first cold-end magnesia column 8 and the second cold-end magnesia column 13 are respectively coaxially arranged above and below the middle magnesia column 10; the inner wall of the middle-protection magnesium oxide column 10 is processed with uniform circular ring sheets 102; the whole circular ring piece 102 is of a spiral structure, and the thread pitches are uniform; the central conducting rod 2 is arranged in the outgoing line conducting tube 4 in a penetrating manner in the middle; the lower end of the central conducting rod 2 is arranged in the second cold-end magnesium oxide column 13, and the lower end of the central conducting rod 2 is connected with a resistance wire connecting piece 12; the upper end of the central conducting rod 2 is exposed, and the upper end of the central conducting rod 2 is connected with an incoming line wiring bar 1; the outgoing line conductive tube 4 is connected with an outgoing line wiring bar 6; the upper end of the spiral resistance wire 9 is electrically connected with the outgoing line conductive tube 4, the lower end of the spiral resistance wire is electrically connected with the resistance wire connecting piece 12, the resistance wire connecting piece 12 is sleeved on the head of the spiral resistance wire 9 and is locked with the spiral resistance wire 9 after stamping, the connection is stable, poor contact is prevented, the spiral resistance wire and the central conductive rod are connected together in a welding mode, other parts of the spiral resistance wire 9 are spirally arranged on a circular ring piece 102 which is in a spiral structure and is arranged on the inner wall of the magnesium oxide column 10 in the center, the parts sequentially enter the incoming line wiring bar 1, the central conductive rod 2, the resistance wire connecting piece 12, the lower end of the spiral resistance wire 9, the upper end of the spiral resistance wire 9, the outgoing line conductive tube 4 and the outgoing line wiring bar 6 to form a closed loop. Go up insulating ceramic tube 3 and lower insulating ceramic tube 7 structure the same, be provided with the chamfer in the hole of going up insulating ceramic tube 3 upper surface, the lower surface is provided with step 16, is convenient for pour into the glue of magnesium oxide powder and later stage sealed. The outer surface of the central conducting rod 2 is provided with an insulating ceramic column 15; the insulating ceramic column 15 is sleeved on the central conducting rod 2, the upper surface of the insulating ceramic column 15 is positioned at the lower end of the step 16 of the upper insulating ceramic tube 3, and the lower surface of the insulating ceramic column 15 is connected to the lower end of the central conducting rod 2. The insulating ceramic column 15 is formed by sequentially connecting a plurality of insulating ceramic column monomers 151, and the insulating ceramic column monomers 15 are made of a nine-five alumina ceramic material; be provided with the recess in the hole of insulating ceramic post monomer 151 upper surface, insulating ceramic post monomer lower surface is provided with the bulge with the butt joint of recess, and the integral connection is firm to increase the electrical insulation of central conducting rod 2 in leading out wire contact tube 4, spiral resistance wire 9 through insulating ceramic post 15. Glue is arranged in a gap at the butt joint part of the upper insulating ceramic tube 3 and the outgoing line conductive tube 4, glue is arranged in a gap at the butt joint part of the lower insulating ceramic tube 7 and the metal sheath tube 11, and the glue is made of silicone rubber 704 glue and AB glue of the American HARDMAN company; the A component model of AB glue of the American HARDMAN company is adhesive HARDMAN 46717, the B component model is adhesive HARDMAN 56717, the A component and the B component are mixed according to the ratio of 1:1 and then used, the AB glue of the American HARDMAN company is firstly sealed for one time, and then the silicon rubber 704 glue is sealed on the surface of the AB glue; the AB glue of HARDMAN company is used for first sealing, the sealing performance of the AB glue after curing is excellent, the electric heating tube is placed in a water tank with the depth of 1.5 meters for 24 hours after being sealed by the AB glue, and the insulation resistance is not reduced after the tube is air-dried. However, the AB glue is very hard after being cured, and in order to avoid capillary cracks generated after vibration in the process of use or transportation and influence on sealing performance, the silicone rubber 704 glue is poured once after the AB glue of HARDMAN company is sealed, the toughness of the cured silicone rubber 704 glue is good, no product cracks are generated after vibration, the defects of the AB glue of HARDMAN company can be well overcome, the sealing performance and the aging resistance of the electrothermal tube can be ensured by matching the two kinds of glue, and the electric insulation performance is good.
Example 4
The magnesium oxide column 10, the first cold-end magnesium oxide column 8 and the second cold-end magnesium oxide column 13 in the middle protection of the application have the following manufacturing steps:
(1) pouring magnesium oxide powder with the purity of more than or equal to 90 percent into a ball mill for grinding for 48 hours;
(2) pouring the paraffin into a paraffin dissolver, and heating to 70-120 ℃ until the paraffin is completely dissolved;
(3) putting the dissolved paraffin and the ground magnesium oxide powder into a high-speed stirrer according to the proportion of 3:17, and uniformly stirring;
(4) placing the uniformly stirred mixture of the paraffin and the magnesia powder into a grouting machine, and grouting to obtain a semi-finished magnesia column product;
(5) and mixing the formed semi-finished magnesium oxide column product and aluminum oxide powder, putting the mixture into a crucible, and then putting the crucible into a kiln at 1280-1300 ℃ for firing for 48 hours to obtain the finished magnesium oxide column product.
Although particular embodiments of the invention have been described and illustrated in detail, it should be understood that various equivalent changes and modifications could be made to the above-described embodiments in accordance with the spirit of the invention, and the resulting functional effects would still fall within the scope of the invention.
Claims (12)
1. The electric heating tube comprises an incoming line bank, a central conductive rod, a spiral resistance wire, an outgoing line conductive tube, a metal sheath tube and an outgoing line bank; a first cold-end magnesium oxide column, a middle-protection magnesium oxide column and a second cold-end magnesium oxide column are arranged in the middle of the metal sheath tube; the first cold-end magnesium oxide column and the second cold-end magnesium oxide column are coaxially arranged above and below the middle magnesium oxide column respectively; the inner wall of the middle-protection magnesium oxide column is processed with uniform circular ring sheets; the whole circular ring piece is of a spiral structure, and the thread pitches are uniform; the central conducting rod penetrates through the outgoing line conducting pipe in the middle; the lower end of the central conducting rod is arranged in the second cold-end magnesium oxide column; the upper end of the central conductive rod is exposed, and the upper end of the central conductive rod is connected with an incoming line wiring bar; the outgoing line conductive tube is connected with an outgoing line wiring bank; the upper end of the spiral resistance wire is electrically connected with the outgoing line conductive tube, the lower end of the spiral resistance wire is electrically connected with the lower end of the central conductive rod, other parts of the spiral resistance wire are spirally arranged on a circular ring piece which is arranged on the inner wall of the magnesium oxide column and is in a spiral structure, and the other parts of the spiral resistance wire sequentially enter the incoming line wiring bar, the central conductive rod, the lower end of the spiral resistance wire, the upper end of the spiral resistance wire, the outgoing line conductive tube and the outgoing line wiring bar through a power supply to form a closed loop;
the magnesium oxide column at the middle protection end, the magnesium oxide column at the first cold end and the magnesium oxide column at the second cold end are formed by combining two semi-cylinders left and right; a first inclined plane is arranged on the semi-cylinder of the middle-protection magnesium oxide cylinder; and the semi-cylinders of the first cold-end magnesium oxide column and the second cold-end magnesium oxide column are provided with second inclined planes.
2. The electrical heating tube according to claim 1, wherein an upper insulating porcelain tube is disposed above the outlet conductive tube; the outer surface of the outgoing line conductive tube is provided with a lower insulating ceramic tube; the lower end of the lower insulating porcelain tube is in butt joint with the first cold-end magnesium oxide column and the upper surface of the metal protective sleeve to form a sealing structure.
3. The electrical heating tube according to claim 2, wherein the upper and lower porcelain insulators have the same structure, and the upper porcelain insulator has a chamfer formed in the inner hole of the upper surface thereof and a step formed on the lower surface thereof.
4. The electrical heating tube according to claim 1, wherein an insulating filler is disposed in a gap between the center conductor bar and the outlet conductor tube; the lower end of the central conducting rod is connected with a resistance wire connecting piece; the lower end of the spiral resistance wire is electrically connected with the lower end of the central conducting rod through a resistance wire connecting piece.
5. The electrical heating tube according to claim 3, wherein an insulating ceramic post is disposed on an outer surface of the central conductive rod; the insulating ceramic column is sleeved on the central conducting rod, the upper surface of the insulating ceramic column is positioned at the lower end of the step of the upper insulating ceramic tube, and the lower surface of the insulating ceramic column is connected to the lower end of the central conducting rod.
6. The electrothermal tube of claim 5, wherein the insulating ceramic posts are formed by connecting a plurality of insulating ceramic post monomers in sequence; be provided with the concave recess in the hole of insulating ceramic post monomer upper surface, insulating ceramic post monomer lower surface is provided with the bulge with the butt joint of concave recess.
7. The electrothermal tube of claim 3, wherein glue is disposed in the gap between the butt joint portions of the upper insulating ceramic tube and the outgoing conductive tube; and glue is arranged in a gap at the butt joint part of the lower insulating ceramic tube and the metal protecting sleeve.
8. The electrothermal tube of claim 1, wherein the lower end of the second cold-end magnesia column is provided with a metal sealing sheet; and the metal sealing sheet is fixed in the metal protective sleeve, and the lower surface of the metal protective sleeve is sealed with the lower end of the second cold-end magnesium oxide column.
9. The electrical heating tube according to claim 1, wherein the outer wall of the lower end of the outlet conductive tube is provided with a spiral groove; the upper end of the spiral resistance wire is spirally arranged in the spiral groove and is electrically fixed with the outgoing line conductive tube.
10. The electrical heating tube of claim 1 wherein the lower end of said outlet conductor tube is above the lower end of the first cold end magnesia column.
11. The electrical heating tube according to claim 1, wherein the other gaps in the metal sheath tube are filled with compacted magnesium oxide powder.
12. The electrothermal tube according to claim 1, wherein the spiral resistance wire is a round resistance wire or a flat resistance wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910398270.5A CN110087352B (en) | 2019-05-14 | 2019-05-14 | Electric heating tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910398270.5A CN110087352B (en) | 2019-05-14 | 2019-05-14 | Electric heating tube |
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| CN110087352A CN110087352A (en) | 2019-08-02 |
| CN110087352B true CN110087352B (en) | 2022-05-27 |
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| CN201910398270.5A Active CN110087352B (en) | 2019-05-14 | 2019-05-14 | Electric heating tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112543520B (en) * | 2019-09-20 | 2023-05-30 | 中微半导体设备(上海)股份有限公司 | Heater, heating method and plasma processor |
| CN114585121B (en) * | 2020-12-01 | 2024-04-09 | 周卫斌 | Powder adding middle-protection conduit and long-length electric heating tube assembly line using same |
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| CN108601119A (en) * | 2018-05-24 | 2018-09-28 | 扬州市优珂电气有限公司 | A kind of electric heating tube |
| 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 |
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2019
- 2019-05-14 CN CN201910398270.5A patent/CN110087352B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101229952B1 (en) * | 2012-04-25 | 2013-02-06 | (주)세진엘러텍 | Pipe for electric heating system |
| 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 |
| 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 |
| CN108601119A (en) * | 2018-05-24 | 2018-09-28 | 扬州市优珂电气有限公司 | A kind of electric heating tube |
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| CN110087352A (en) | 2019-08-02 |
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