CN107466121B - Fireproof mineral insulation heating cable and processing method thereof - Google Patents
Fireproof mineral insulation heating cable and processing method thereof Download PDFInfo
- Publication number
- CN107466121B CN107466121B CN201710788964.0A CN201710788964A CN107466121B CN 107466121 B CN107466121 B CN 107466121B CN 201710788964 A CN201710788964 A CN 201710788964A CN 107466121 B CN107466121 B CN 107466121B
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- CN
- China
- Prior art keywords
- heating cable
- cable
- bushing
- protection layer
- metal protection
- 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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- 238000010438 heat treatment Methods 0.000 title claims abstract description 55
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 19
- 239000011707 mineral Substances 0.000 title claims abstract description 19
- 238000009413 insulation Methods 0.000 title claims abstract description 10
- 238000003672 processing method Methods 0.000 title description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 52
- 239000002184 metal Substances 0.000 claims abstract description 52
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 20
- 239000010935 stainless steel Substances 0.000 claims abstract description 20
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims description 43
- 239000003365 glass fiber Substances 0.000 claims description 15
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 7
- 230000009970 fire resistant effect Effects 0.000 claims description 6
- 239000011241 protective layer Substances 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims 2
- 238000003825 pressing Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Classifications
-
- 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
- H05B3/54—Heating elements having the shape of rods or tubes flexible
- H05B3/56—Heating cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0258—Disposition of insulation comprising one or more longitudinal lapped layers of insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Resistance Heating (AREA)
- Cable Accessories (AREA)
Abstract
The invention provides a fireproof mineral insulation heating cable which comprises a heating cable and a conductive cable which are connected with each other, wherein the heating cable comprises a metal wire core, a stainless steel outer sleeve and a filled magnesia insulation layer, and further comprises an outer liner sleeved on one side of the heating cable, the outer liner comprises a threaded end positioned at one end of the heating cable and a wedge-shaped opening opposite to the threaded end, an inner liner is arranged in the wedge-shaped opening, the threaded end is in threaded connection with a threaded sleeve, the outer ends of the threaded sleeve and the inner liner are connected with a clamping sleeve type connector, and a metal protection layer is wound on the outer sides of the heating cable and the conductive cable connector structure.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a fireproof mineral insulation heating cable and a processing method thereof.
Background
As the power demand of various industries increases, the use of cables and the requirements of cable laying and environment are also increasing. A common single type of cable has failed to meet the various demands of today.
The existing double-core mineral insulated heating cable has the characteristics of high extrusion resistance, high temperature resistance, long service life and the like, although the existing double-core mineral insulated heating cable has many advantages. But the insulation is realized by filling magnesium oxide between the heating core wire of the mineral insulation heating cable and the stainless steel outer sheath. The magnesium oxide is easy to absorb water and wet, on one hand, the insulating capability of the magnesium oxide is reduced due to the absorption of water and wet, and on the other hand, the stainless steel outer sheath is easy to crack and lose the service capability if the magnesium oxide is wet in the use process. Under the action of bending and external pressure, the welding seam at the end joint of the mineral insulated heating cable is easy to crack, so that the magnesium oxide filled at the joint is wetted, and the cable fails. In the cable manufacturing process, the quantity of the magnesium oxide filled in the connecting part is difficult to ensure, the magnesium oxide is easy to be unevenly distributed, an air cavity is formed, and the influence is caused in the follow-up welding.
Disclosure of Invention
The invention provides a fireproof mineral insulation heating cable and a processing method thereof, and aims to overcome the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a fire prevention mineral insulation heating cable, includes interconnect's heating cable and conductive cable, heating cable includes metal core, stainless steel outer tube and the magnesium oxide insulating layer of packing, its characterized in that: the heating cable is characterized by further comprising an outer bushing sleeved on one side of the heating cable, the outer bushing comprises a threaded end positioned at one end of the heating cable and a wedge-shaped opening opposite to the threaded end, an inner bushing is arranged in the wedge-shaped opening, the threaded end is in threaded connection with a threaded sleeve, the threaded sleeve is connected with the outer end of the inner bushing, a clamping sleeve type connector is connected with the outer end of the threaded sleeve, a metal protection layer is wound on the outer side of the heating cable and the outer side of the conductive cable connector, the metal protection layer comprises a main body part and an extending part positioned on one side of the main body part and forming a U-shaped groove with the main body, clamping fit protrusions are arranged on the extending part and the main body part, and two ends of the metal protection layer are connected with the outer bushing in a welding mode.
The outer bushing, the inner bushing, the threaded sleeve and the sleeve type connector sleeve are matched to seal and insulate the cable connector, and the bending resistance and the compression resistance of the joint are improved by adopting the metal protection layer.
Preferably, a groove is formed in a side of the main body portion, which is close to the outer liner, and the groove extends in an extending direction of the metal protection layer.
Preferably, the cross-sectional shape of the groove is square.
Preferably, the main body portion is integrally formed with the extension portion.
Preferably, a glass fiber tape layer is arranged between the heating cable and the conductive cable joint structure and the metal protective layer.
Thus, when the cable is bent and pressed, the glass fiber tape layer counteracts the partial extrusion and friction between the metal protective layer and the stainless steel outer sleeve and the sleeve.
The processing method of the fireproof mineral insulated heating cable is characterized by comprising the following steps of:
step 1, sleeving an outer bushing, an inner bushing, a threaded sleeve and a clamping sleeve type joint into a heating cable and a conductive cable, butting metal wire cores of the heating cable and the conductive cable, welding the metal wire cores together, adjusting the position of the outer bushing to enable the middle of an inner cavity of the outer bushing to be positioned near the joint of the metal wire cores, screwing the threaded sleeve of a knob, screwing the clamping sleeve type joint to fix the outer bushing, pouring magnesia powder from one side of a wedge-shaped opening of the outer bushing, inserting the inner bushing and compressing the magnesia powder in the outer bushing, screwing the clamping sleeve type joint at the side to fix the inner bushing;
and 2, winding a glass fiber belt, wherein the glass fiber belt completely wraps the outer bushing, the inner bushing, the threaded sleeve, the clamping sleeve type joint and the stainless steel outer sleeve with at least 100mm on two sides, winding a metal protection layer on the outer side of the glass fiber belt, fastening the extending parts of the adjacent metal protection layers, and welding the connecting parts of the metal protection layers and the stainless steel outer sleeve by using high-temperature resistant welding materials.
Preferably, after the outer bush and the inner bush are fixed, a connection gap between the outer bush, the inner bush, the threaded sleeve, the ferrule-type joint, and the stainless steel outer sleeve is welded.
Preferably, after the two ends of the metal protection layer are wound on the stainless steel outer sleeve, one side of the end of the metal protection layer is fixed through the clamp, so that the two ends of the metal protection layer are welded.
In summary, the invention has the following advantages: the joint is sealed effectively, and convenient operation has avoided the magnesia powder that fills to wet the denaturation, and joint junction is difficult for damaging destruction, has prolonged life.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic cross-sectional view of a heating cable;
fig. 3 is a schematic cross-sectional structure of a metal protection layer.
The reference numerals in the figures are as follows:
1. the cable comprises a heating cable, a metal wire core, a 12 outer sleeve, a 13 magnesium oxide insulating layer, a 2 conductive cable, a 3 outer sleeve, a 31 threaded end, a 32 wedge-shaped opening, a 4 inner sleeve, a 5 threaded sleeve, a 6 ferrule type joint, a 7 metal protection layer, a 71 main body part, a 72 extension part and a 8 glass fiber tape layer.
Detailed Description
The invention will be further described with reference to examples of embodiments in the drawings.
A fire-resistant mineral insulated heating cable as shown in fig. 1 to 3 comprises a heating cable 1 and a conductive cable 2 connected to each other, the heating cable 1 comprising a metal core 11, a stainless steel outer jacket 12 and a filled magnesium oxide insulating layer 13. The heating cable further comprises an outer liner 3 sleeved on one side of the heating cable 1, wherein the outer liner 3 comprises a threaded end 31 positioned at one end of the heating cable 1 and a wedge-shaped opening 32 opposite to the threaded end. The wedge-shaped opening 32 is internally provided with an inner bushing 4, the threaded end 31 is in threaded connection with a threaded sleeve 5, the threaded sleeve 5 and the outer end of the inner bushing 4 are connected with a clamping sleeve type connector 6, the outer side of the connector structure of the heating cable 1 and the conductive cable 2 is wound with a metal protection layer 7, the metal protection layer 7 comprises a main body part 71 and an extending part 72 which is positioned on one side of the main body part 71 and forms a U-shaped groove with the main body, the extending part 72 and the main body part 71 are provided with protrusions which are in clamping fit, and two ends of the metal protection layer 7 are in welded connection with the outer bushing 3. The outer bushing 3, the inner bushing 4, the threaded sleeve 5 and the ferrule type connector 6 are matched to seal and insulate the cable connector, and the metal protection layer 7 is adopted to improve the bending resistance and the compression resistance of the joint.
The main body 71 is provided with a groove on a side close to the outer liner 3, the groove extending in the extending direction of the metal cap layer 7. The cross-section shape of the groove is square. The body portion 71 is integrally formed with the extension portion 72.
A glass fiber tape layer 8 is arranged between the joint structure of the heating cable 1 and the conductive cable 2 and the metal protective layer 7, and when the cable is bent and pressed, the glass fiber tape layer 8 counteracts the partial extrusion and friction action between the metal protective layer 7 and the stainless steel outer sleeve 12 and the bushing.
A processing method of a fireproof mineral insulated heating cable comprises the following steps:
step 1, sleeving an outer bushing 3, an inner bushing 4, a threaded sleeve 5 and a clamping sleeve type joint 6 into a heating cable 1 and a conductive cable 2, butting metal wire cores 11 of the heating cable 1 and the conductive cable 2, welding the heating cable 1 and the conductive cable together, adjusting the position of the outer bushing 3 to enable the middle part of an inner cavity of the outer bushing to be positioned near the joint of the metal wire cores 11, screwing the clamping sleeve type joint 6 to fix the outer bushing 3 by screwing the threaded sleeve 5 of a knob, pouring magnesia powder from one side of a wedge-shaped opening of the outer bushing 3, inserting the inner bushing 4 and compressing the magnesia powder in the outer bushing 3, and screwing the clamping sleeve type joint 6 at the side to fix the inner bushing 4;
step 2, winding a glass fiber belt, wherein the glass fiber belt completely wraps the outer bushing 3, the inner bushing 4, the threaded sleeve 5, the ferrule type joint 6 and the stainless steel outer sleeve 12 with at least 100mm on both sides, the metal protection layer 7 is wound outside the glass fiber belt, the protruding parts 72 of the adjacent metal protection layers 7 are buckled, and the connection part of the metal protection layers 7 and the stainless steel outer sleeve 12 is welded by using high-temperature resistant solder.
After the outer bush 3 and the inner bush 4 are fixed, the connection gap between the outer bush 3, the inner bush 4, the threaded sleeve 5, the ferrule-type joint 6 and the stainless steel outer sleeve 12 is subjected to build-up welding. After the two ends of the metal protection layer 7 are wound on the stainless steel outer sleeve 12, one side of the end part of the metal protection layer 7 is fixed through a clamp, and the two ends of the metal protection layer 7 are welded.
The above description is only illustrative of the invention so that those skilled in the art can fully practice the present invention, but not limiting the invention, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without inventive contribution, as desired, which are not creatively modified, but are protected by patent laws within the scope of the claims of the present invention.
Claims (6)
1. Fireproof mineral insulation heating cable, including interconnect's heating cable (1) and conductive cable (2), heating cable (1) include metal core (11), stainless steel outer tube (12) and magnesium oxide insulating layer (13) of packing, its characterized in that: the heating cable is characterized by further comprising an outer liner (3) sleeved on one side of the heating cable (1), wherein the outer liner (3) comprises a threaded end (31) positioned on one side of the heating cable (1) and a wedge-shaped opening (32) opposite to the threaded end, an inner liner (4) is arranged in the wedge-shaped opening (32), the threaded end (31) is in threaded connection with a threaded sleeve (5), the threaded sleeve (5) and the outer end of the inner liner (4) are connected with a clamping sleeve type joint (6), a metal protection layer (7) is wound on the outer side of the joint structure of the heating cable (1) and the conductive cable (2), the metal protection layer (7) comprises a main body part (71) and an extending part (72) positioned on one side of the main body part and forming a U-shaped groove with the main body part, the extending part (72) and the main body part (71) are provided with protrusions in clamping fit, and the two ends of the metal protection layer (7) are in welded connection with the outer liner (3);
a square groove is formed in one side, close to the outer lining (3), of the main body part (71), and extends along the extending direction of the metal protection layer (7);
the main body portion (71) is integrally formed with the protruding portion (72).
2. A fire resistant mineral insulated heating cable as recited in claim 1, wherein: the cross section of the groove is square.
3. A fire resistant mineral insulated heating cable as recited in claim 1, wherein: and a glass fiber tape layer (8) is arranged between the joint structure of the heating cable (1) and the conductive cable (2) and the metal protective layer (7).
4. A method of manufacturing a fire resistant mineral insulated heating cable according to any one of claims 1 to 3, comprising the steps of:
step 1, sleeving an outer bushing (3), an inner bushing (4), a threaded sleeve (5) and a clamping sleeve type connector (6) into a heating cable (1) and a conductive cable (2), butting metal wire cores (11) of the heating cable (1) and the conductive cable (2) and welding the metal wire cores together, adjusting the position of the outer bushing (3) to enable the middle part of an inner cavity of the outer bushing to be positioned near the joint of the metal wire cores (11), screwing the clamping sleeve type connector (6) to fix the outer bushing (3), pouring magnesium oxide powder from one side of a wedge-shaped opening of the outer bushing (3), inserting the inner bushing (4) and pressing the magnesium oxide powder in the outer bushing (3), and screwing the clamping sleeve type connector (6) on the side to fix the inner bushing (4);
step 2, winding a glass fiber belt, wherein the glass fiber belt completely wraps an outer bushing (3), an inner bushing (4), a threaded sleeve (5), a cutting sleeve type joint (6) and stainless steel outer sleeves (12) with two sides of at least 100mm, the outer side of the glass fiber belt is wound with a metal protection layer (7) and buckled with an extending part (72) of the adjacent metal protection layer (7), and the joint of the metal protection layer (7) and the stainless steel outer sleeves (12) is welded by using high-temperature-resistant welding materials.
5. The method of processing a fire resistant mineral insulated heating cable of claim 4, wherein: after the outer lining (3) and the inner lining (4) are fixed, overlaying is carried out on the connection gaps among the outer lining (3), the inner lining (4), the threaded sleeve, the cutting sleeve type connector (6) and the stainless steel outer sleeve (12).
6. The method of processing a fire resistant mineral insulated heating cable of claim 4, wherein: and after the two ends of the metal protection layer (7) are wound on the stainless steel outer sleeve (12), one side of the end part of the metal protection layer (7) is fixed through a clamp, and welding is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710788964.0A CN107466121B (en) | 2017-09-05 | 2017-09-05 | Fireproof mineral insulation heating cable and processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710788964.0A CN107466121B (en) | 2017-09-05 | 2017-09-05 | Fireproof mineral insulation heating cable and processing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107466121A CN107466121A (en) | 2017-12-12 |
| CN107466121B true CN107466121B (en) | 2023-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710788964.0A Active CN107466121B (en) | 2017-09-05 | 2017-09-05 | Fireproof mineral insulation heating cable and processing method thereof |
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| Country | Link |
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| CN (1) | CN107466121B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347792A (en) * | 2018-04-25 | 2018-07-31 | 福建通宇电缆有限公司 | A kind of insulation heating cable |
| CN108894734A (en) * | 2018-06-21 | 2018-11-27 | 招商局重工（江苏）有限公司 | A kind of electric-heating belt is placed in the combustible ice Primordial Qi oil reservoir standpipe device outside oil reservoir standpipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1543694A (en) * | 2001-06-20 | 2004-11-03 | �����ա��ڵ� | Conductor system |
| CN103945583A (en) * | 2014-05-08 | 2014-07-23 | 博太科防爆设备（上海）有限公司 | Fireproof mineral insulation heating cable loop structure and manufacturing method thereof |
| WO2015146220A1 (en) * | 2014-03-28 | 2015-10-01 | 住友電気工業株式会社 | Terminal structure for superconducting cable |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6437246B1 (en) * | 2000-12-20 | 2002-08-20 | Pyrotenax Cables, Ltd. | Termination coupling for mineral insulated cable |
| CN207266316U (en) * | 2017-09-05 | 2018-04-20 | 福建通宇电缆有限公司 | One kind fire prevention mineral insulation heating cable |
-
2017
- 2017-09-05 CN CN201710788964.0A patent/CN107466121B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1543694A (en) * | 2001-06-20 | 2004-11-03 | �����ա��ڵ� | Conductor system |
| WO2015146220A1 (en) * | 2014-03-28 | 2015-10-01 | 住友電気工業株式会社 | Terminal structure for superconducting cable |
| CN103945583A (en) * | 2014-05-08 | 2014-07-23 | 博太科防爆设备（上海）有限公司 | Fireproof mineral insulation heating cable loop structure and manufacturing method thereof |
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| CN107466121A (en) | 2017-12-12 |
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Effective date of registration: 20231116 Address after: 044000 South Sushui Avenue Industrial Science and Technology Park, Huanghe Avenue, Yanhu District, Yuncheng City, Shanxi Province Applicant after: Shanxi Haishun Cable Co.,Ltd. Address before: No. 1, Ancient Locust Fragment, Binhai Industrial Concentration Zone, Fuzhou City, 350000 Fujian Province Applicant before: FUJIAN TONGYU CABLES Co.,Ltd. |
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