CN112152182A - Fire-resistant protection device for cable intermediate joint, manufacturing and using method - Google Patents
Fire-resistant protection device for cable intermediate joint, manufacturing and using method Download PDFInfo
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- CN112152182A CN112152182A CN202011101732.1A CN202011101732A CN112152182A CN 112152182 A CN112152182 A CN 112152182A CN 202011101732 A CN202011101732 A CN 202011101732A CN 112152182 A CN112152182 A CN 112152182A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
- H02G15/196—Cable junctions protected by sleeves, e.g. for communication cable having lapped insulation
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Abstract
The invention provides a fireproof protection device for a cable intermediate joint, which comprises a support tube (1), a fireproof short core (2), a fireproof long core (3) and a fireproof insulating layer (4); wherein: the fireproof short core (2) and the fireproof long core (3) are formed by mixing, vulcanizing and molding ceramic conductive silicon rubber; the fireproof insulation layer (4) is formed by mixing, vulcanizing and molding ceramic insulation silicon rubber; the fireproof insulation layer (4), the fireproof short core (2) and the fireproof long core (3) are integrally formed and sleeved on the support pipe (1). The invention also discloses a corresponding manufacturing method and a using method. The invention can ensure the safety of the cable joint and quickly realize positioning alarm.
Description
Technical Field
The invention relates to a cable accessory in the power industry, in particular to a fireproof protection device for a cable intermediate joint, and a manufacturing and using method thereof.
Background
Because the cable is limited by the factors such as the length of raw materials, storage and transportation conditions, use conditions and the like, the cable is generally stored, transported and used in a mode of coiling the cable with a certain length. In the connection part of two sections of cables, devices or accessories such as a cable distribution box, a cable intermediate connection and the like are needed to be used for connecting the conductive parts of the two cables, and meanwhile, insulation protection is provided, and the operation safety of a line is guaranteed.
In the accident statistics of the power system, most of the sudden accidents are concentrated at the cable intermediate connection positions. Due to the material characteristics of the cable intermediate connection, the insulation strength is reduced along with the temperature rise, so that when the temperature rise is caused abnormally at the cable intermediate connection position, the insulation strength of the insulation material is suddenly reduced, the accident influence is further enlarged, and the serious consequences such as intermediate connection explosion, power failure and the like are caused.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a fireproof protection device for a cable intermediate joint, a manufacturing method and a using method, which can ensure that the cable joint still can keep the insulating property and the physical strength under a high-temperature or fire state, and can quickly position and alarm an accident point.
In order to solve the above technical problems, an aspect of the present invention provides a fireproof protection device for an intermediate joint of a cable, which includes a support tube, a fireproof short core, a fireproof long core, and a fireproof insulating layer; wherein:
the supporting tube is formed by winding and welding a supporting strip made of PE material;
the fireproof short core and the fireproof long core are both of tubular structures and are formed by mixing, vulcanizing and molding ceramic conductive silicon rubber;
the fireproof insulation layer is of a tubular structure and is formed by mixing, vulcanizing and molding ceramic insulation silicon rubber;
the fireproof type insulating layer wraps the outer surfaces of the fireproof type short core and the fireproof type long core;
the fireproof insulation layer after integral forming is sleeved on the supporting tube.
Preferably, the fireproof short core and the fireproof long core have structures with rounded edges, and the rounded angles are R0.5-R3 mm.
Preferably, the thickness of the fireproof short core and the fireproof long core is 1-2 mm, and the thickness of the fireproof insulating layer is 4-15 mm.
Preferably, the outer layer of the fireproof insulating layer is further connected with temperature measuring equipment with a positioning function, and the temperature measuring equipment is used for sending the positioning of a fault point and accident information back to the dispatching center when a cable connecting position has a fault.
Preferably, the fireproof short core, the fireproof long core and the fireproof insulating layer are subjected to ceramic treatment at high temperature.
As another aspect of the present invention, there is also provided a method of manufacturing a fire-resistant type protection device for an intermediate joint of a cable, including the steps of:
step one, adopting ceramic insulating silicon rubber to mix, vulcanize and mold to form a fireproof short core and a fireproof long core;
step two, integrally forming the fireproof short core, the fireproof long core and the fireproof insulating layer in a mold;
and step three, expanding the integrally formed fireproof insulation layer to a supporting pipe through expansion equipment, wherein the supporting pipe is formed by winding and welding a supporting bar made of PE materials.
Preferably, the step of forming the fireproof short core and the fireproof long core in the step one specifically comprises the following steps:
uniformly mixing special power silicon rubber, conductive carbon black, low-temperature glass powder, a boron-containing compound (such as zinc borate) and zinc oxide; then adding a bis-di-tetra-vulcanizing agent with the proportion of 1-2 percent, and mixing until the mixture is soft and uniform; wherein the roller temperature cannot be higher than 50 ℃ during mixing; the vulcanization molding temperature is 150-300 ℃;
respectively forming a fireproof short core and a fireproof long core in corresponding moulds by adopting an injection or glue swinging mode;
trimming and polishing the fireproof short core and the fireproof long core after vulcanization molding to remove the glue edge and the sharp corner of the feed inlet during molding.
Preferably, the second step further comprises:
uniformly mixing special electric silicon rubber, low-temperature glass powder, a boron-containing compound (such as zinc borate) and zinc oxide, adding a bis-tetra-vulcanizing agent in a proportion of 1-2%, and mixing until the mixture is soft and uniform, wherein the roller temperature cannot be higher than 50 ℃ during mixing; the vulcanization molding temperature is 150-300 ℃;
putting the fireproof short core and the fireproof long core into a mold, feeding in an injection or glue swing mode, and forming an integrally-formed fireproof insulating layer in the mold;
and carrying out secondary vulcanization on the integrally formed fireproof insulating layer, wherein the temperature of the secondary vulcanization is 160-230 ℃.
As still another aspect of the present invention, there is also provided a method of using a fire-resistant type protection device for a cable intermediate joint, including the steps of:
firstly, providing a fire-proof protection device for a cable intermediate joint according to any one of claims 1 to 5;
stripping and cutting the two cables, connecting the two cables, sleeving the fireproof protection device on the cables, and enabling the cable connecting position to be located inside the fireproof protection device;
and step three, extracting the supporting pipe, so that the integrally formed fireproof insulating layer of the fireproof protection device is contracted and wraps the cable connection position area.
Preferably, further comprising:
when abnormal temperature rise occurs at the connecting position of the cable and high temperature or fire occurs, the fireproof short core, the fireproof long core and the fireproof insulating layer of the fireproof protection device material are rapidly subjected to ceramic treatment, so that the fireproof short core, the fireproof long core and the fireproof insulating layer are changed into a firm ceramic body from an elastic silicon rubber body;
and the outer-layer temperature measuring equipment sends the positioning of the fault point and the accident information back to the dispatching center.
The implementation of the invention has the following advantages:
the invention provides a fireproof protection device for a cable intermediate joint, and a manufacturing and using method thereof, wherein a fireproof short core, a fireproof long core and a fireproof insulating layer which are made of special materials are adopted, and under the condition that the cable joint is at a high temperature or in a fire state, the fireproof short core, the fireproof long core and the fireproof insulating layer can rapidly realize ceramic, so that the fireproof short core, the fireproof long core and the fireproof insulating layer are changed from an elastic silicon rubber body into a firm ceramic body, and the insulating property and the physical strength can be maintained;
meanwhile, the outer layer of the fireproof insulating layer is provided with the temperature measuring equipment with the positioning function, so that the accident point can be quickly positioned and alarmed, power transmission and distribution scheduling can be performed, the accident is prevented from being enlarged, the accident point is quickly treated at a fixed point, and the fireproof insulating layer has very important significance for safe and stable operation of a power system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic structural view of a fireproof protection device for a cable intermediate joint provided by the invention;
FIG. 2 is a schematic flow chart illustrating a method of manufacturing a flameproof protection device for a cable intermediate joint in accordance with the present invention;
fig. 3 is a schematic flow chart of a method for using the fireproof protection device for the cable intermediate joint provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
For those skilled in the art to more clearly understand the objects, technical solutions and advantages of the present invention, the following description will be further provided in conjunction with the accompanying drawings and examples.
Referring to fig. 1, there is shown a schematic structural view of an embodiment of a fire-proof protection device for an intermediate joint of a cable according to the present invention. In the embodiment, the fireproof protection device comprises a support pipe 1, a fireproof short core 2, a fireproof long core 3 and a fireproof insulation layer 4; wherein:
the supporting tube 1 is formed by winding and welding a supporting strip made of PE (polypropylene), and two specifications of 7 × 1.7mm and 6 × 3.6mm can be preferably selected according to different conditions of inner diameter size, expansion multiplying power and holding force during use;
the fireproof short core 2 and the fireproof long core 3 are both of tubular structures and are formed by mixing, vulcanizing and molding ceramic conductive silicon rubber; the fireproof short core 2 and the fireproof long core 3 have structures with edge fillets, and the fillets are R0.5-R3 mm; the number and arrangement of the fireproof short cores 2 and the fireproof long cores 3 can be flexibly set according to the needs, and only one example is shown in fig. 1.
The fireproof insulation layer 4 is of a tubular structure and is formed by mixing, vulcanizing and molding ceramic insulation silicon rubber;
the fireproof type short core 2 and the fireproof type long core 3 are prefabricated and formed and are integrally formed with a fireproof type insulating layer 4, and the fireproof type insulating layer 4 wraps the outer surfaces of the fireproof type short core 2 and the fireproof type long core 3;
the fireproof insulation layer formed integrally is sleeved on the supporting tube 1.
Wherein, the thickness of the short core of fire prevention type 2, the long core of fire prevention type 3, preferred 1 ~ 2mm, the thickness of fire prevention type insulating layer 4 is different according to the service voltage grade, will set up different thickness, and thickness commonly used is 4 ~ 15 mm.
The shielding resistance of the fireproof core 2 and the fireproof core 3 should be less than 5000 Ω · cm, preferably 100 Ω · cm to 500 Ω · cm.
In a specific embodiment, a temperature measuring device (not shown) with a positioning function is further connected to the outer layer of the fireproof insulation layer 4, and is used for sending the positioning of a fault point and accident information back to the dispatching center when a cable connection position has a fault.
Wherein, the fireproof short core 2, the fireproof long core 3 and the fireproof insulating layer 4 can be ceramic-processed at high temperature. The composition of these components will be further described below in connection with the method of making the fire-resistant protective device.
Referring to fig. 2, there is shown a method of manufacturing a fire-resistant type protection device for an intermediate joint of a cable according to the present invention, for manufacturing the fire-resistant type protection device described in the foregoing fig. 2. In this embodiment, the manufacturing method includes the steps of:
step one, adopting ceramic insulating silicon rubber to mix, vulcanize and mold to form a fireproof short core 2 and a fireproof long core 3;
step two, integrally forming the fireproof short core 2, the fireproof long core 3 and the fireproof insulating layer 4 in a mold;
and step three, expanding the integrally formed fireproof insulation layer 4 to the supporting pipe 1 through expansion equipment, wherein the supporting pipe 1 is formed by winding and welding supporting bars made of PE materials.
More specifically, the step of forming the fireproof short core 2 and the fireproof long core 3 in the step one specifically comprises the following steps:
uniformly mixing special power silicon rubber, conductive carbon black, low-temperature glass powder, a boron-containing compound (such as zinc borate) and zinc oxide; then adding a bis-di-tetra-vulcanizing agent with the proportion of 1-2 percent, and mixing until the mixture is soft and uniform; wherein the roller temperature cannot be higher than 50 ℃ during mixing; the vulcanization molding temperature is 150-300 ℃;
respectively forming a fireproof short core 2 and a fireproof long core 3 in corresponding moulds by adopting an injection or glue swinging mode;
the fireproof short core 2 and the fireproof long core 3 which are formed by vulcanization are trimmed and polished, sharp corners of a glue edge and a feed inlet during forming are processed, and internal point discharge is prevented during use.
More specifically, the second step further comprises:
uniformly mixing special electric silicon rubber, low-temperature glass powder, a boron-containing compound (such as zinc borate) and zinc oxide, adding a bis-tetra-vulcanizing agent in a proportion of 1-2%, and mixing until the mixture is soft and uniform, wherein the roller temperature cannot be higher than 50 ℃ during mixing; the vulcanization molding temperature is 150-300 ℃;
putting the fireproof short core 2 and the fireproof long core 3 into a mold, feeding in an injection or glue swing mode, and forming an integrally-formed fireproof insulating layer 4 in the mold;
and carrying out secondary vulcanization on the integrally formed fireproof insulation layer 4, wherein the temperature of the secondary vulcanization is 160-230 ℃.
Referring to fig. 3, a schematic flow chart illustrating one embodiment of a method of using a flameproof protection device for a cable intermediate joint according to the present invention is shown. In this embodiment, the using method includes the following steps:
step one, providing a protection device of the fire-proof type for the intermediate joint of cables described in the aforesaid fig. 1 (manufactured in fig. 2);
stripping and cutting the two cables, connecting the two cables, sleeving the fireproof protection device on the cables, and enabling the cable connecting position to be located inside the fireproof protection device;
and step three, extracting the support pipe 1 to enable the fireproof insulation layer 4 integrally formed with the fireproof protection device to contract and wrap the cable connection position area.
More specifically, the method further comprises the following steps:
when abnormal temperature rise occurs at the cable connecting position and high temperature or fire occurs, the fireproof short core 2, the fireproof long core 3 and the fireproof insulating layer 4 of the fireproof protection device material are rapidly ceramized, so that the fireproof short core and the fireproof long core are changed into firm ceramic bodies from elastic silicon rubber bodies;
and the outer-layer temperature measuring equipment sends the positioning of the fault point and the accident information back to the dispatching center.
It can be understood that after the fireproof protection device for the cable intermediate joint is used, when a cable connection position fails, the fireproof protection device for the cable intermediate joint quickly completes ceramic formation, and meanwhile, the outer-layer temperature measurement equipment immediately sends fault point positioning and accident information back to a dispatching center, so that time is provided for intelligent dispatching and power supply rush repair, the influence of faults is prevented from being enlarged, and sudden accidents are avoided.
Tests prove that the fireproof protection device for the cable intermediate joint has the characteristics of excellent fire prevention, flame retardance, low smoke, no toxicity and the like, after high temperature or ignition, the ceramic shell is not melted and does not drip in a fire environment, and can be subjected to line integrity experiments of firing for 90min and cooling for 15min at the temperature of 950-1000 ℃ specified in GB/T19216.21-2003, so that the fireproof protection device is suitable for any places needing fire prevention, and can ensure safe and stable operation under the fault of the intermediate connection position of a cable.
The embodiment of the invention has the following beneficial effects:
the invention provides a fireproof protection device for a cable intermediate joint, and a manufacturing and using method thereof, wherein a fireproof short core, a fireproof long core and a fireproof insulating layer which are made of special materials are adopted, and under the condition that the cable joint is at a high temperature or in a fire state, the fireproof short core, the fireproof long core and the fireproof insulating layer can rapidly realize ceramic, so that the fireproof short core, the fireproof long core and the fireproof insulating layer are changed from an elastic silicon rubber body into a firm ceramic body, and the insulating property and the physical strength can be maintained;
meanwhile, the outer layer of the fireproof insulating layer is provided with the temperature measuring equipment with the positioning function, so that the accident point can be quickly positioned and alarmed, power transmission and distribution scheduling can be performed, the accident is prevented from being enlarged, the accident point is quickly treated at a fixed point, and the fireproof insulating layer has very important significance for safe and stable operation of a power system.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. A fireproof protection device for a cable intermediate joint is characterized by comprising a support tube (1), a fireproof short core (2), a fireproof long core (3) and a fireproof insulating layer (4); wherein:
the supporting tube (1) is formed by winding, welding and molding a supporting strip made of PE material;
the fireproof short core (2) and the fireproof long core (3) are both of a tubular structure and are formed by mixing, vulcanizing and molding ceramic conductive silicon rubber;
the fireproof insulation layer (4) is of a tubular structure and is formed by mixing, vulcanizing and molding ceramic insulation silicon rubber;
the fireproof type short core (2) and the fireproof type long core (3) are prefabricated and formed and are integrally formed with a fireproof type insulating layer (4), and the fireproof type insulating layer (4) wraps the outer surfaces of the fireproof type short core (2) and the fireproof type long core (3);
the fireproof insulation layer formed integrally is sleeved on the supporting tube (1).
2. The fire protection type protection device according to claim 1, wherein the fire protection type short core (2) and the fire protection type long core (3) have a structure with rounded edges, and the rounded edges are R0.5-R3 mm.
3. The fire-proof type protection device according to claim 2, wherein the thickness of the fire-proof type short core (2) and the fire-proof type long core (3) is 1-2 mm, and the thickness of the fire-proof type insulating layer (4) is 4-15 mm.
4. A fire-resistant protection device according to any one of claims 1 to 3, wherein a temperature measuring device with a positioning function is further connected to the outer layer of the fire-resistant insulation layer (4) for sending the positioning of a fault point and accident information back to a dispatching center when a cable connection position has a fault.
5. A fire protection system according to claim 4, wherein the fire short core (2), the fire long core (3) and the fire insulating layer (4) are ceramic-formed at high temperature.
6. A method of manufacturing a flameproof protection device for an intermediate joint of a cable, comprising the steps of:
step one, adopting ceramic insulating silicon rubber to mix, vulcanize and mold to form a fireproof short core (2) and a fireproof long core (3);
step two, integrally forming the fireproof short core (2), the fireproof long core (3) and the fireproof insulating layer (4) in a mold;
and step three, expanding the integrally formed fireproof insulation layer (4) to the supporting pipe (1) through expansion equipment, wherein the supporting pipe (1) is formed by winding and welding supporting bars made of PE materials.
7. The method according to claim 6, wherein the step of forming the fireproof short core (2) and the fireproof long core (3) in the step one specifically comprises the following steps:
uniformly mixing special power silicon rubber, conductive carbon black, low-temperature glass powder, a boron-containing compound (such as zinc borate) and zinc oxide; then adding a bis-di-tetra-vulcanizing agent with the proportion of 1-2 percent, and mixing until the mixture is soft and uniform; wherein the roller temperature cannot be higher than 50 ℃ during mixing; the vulcanization molding temperature is 150-300 ℃;
respectively forming a fireproof short core (2) and a fireproof long core (3) in corresponding moulds by adopting an injection or glue swinging mode;
and trimming and polishing the fireproof short core (2) and the fireproof long core (3) after vulcanization molding to remove the sharp corners of the glue edge and the feed inlet during molding.
8. The method of claim 7, wherein step two further comprises:
uniformly mixing special electric silicon rubber, low-temperature glass powder, a boron-containing compound (such as zinc borate) and zinc oxide, adding a bis-tetra-vulcanizing agent in a proportion of 1-2%, and mixing until the mixture is soft and uniform, wherein the roller temperature cannot be higher than 50 ℃ during mixing; the vulcanization molding temperature is 150-300 ℃;
putting the fireproof short core (2) and the fireproof long core (3) into a mold, and feeding in an injection or glue arrangement mode to form an integrally-formed fireproof insulating layer (4) in the mold;
and carrying out secondary vulcanization on the integrally formed fireproof insulation layer (4), wherein the temperature of the secondary vulcanization is 160-230 ℃.
9. A method of using a fire-resistant protective device for an intermediate joint of a cable, comprising the steps of:
firstly, providing a fire-proof protection device for a cable intermediate joint according to any one of claims 1 to 5;
stripping and cutting the two cables, connecting the two cables, sleeving the fireproof protection device on the cables, and enabling the cable connecting position to be located inside the fireproof protection device;
and step three, extracting the support pipe (1) to enable the fireproof insulation layer (4) which is integrally formed with the fireproof protection device to contract and wrap the cable connection position area.
10. The method of use of claim 9, further comprising:
when abnormal temperature rise occurs at the cable connecting position and high temperature or fire occurs, the fireproof short core (2), the fireproof long core (3) and the fireproof insulating layer (4) of the fireproof protection device material are rapidly ceramized, so that the fireproof short core and the fireproof long core are changed into firm ceramic bodies from elastic silicon rubber bodies;
and the outer-layer temperature measuring equipment sends the positioning of the fault point and the accident information back to the dispatching center.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011101732.1A CN112152182A (en) | 2020-10-15 | 2020-10-15 | Fire-resistant protection device for cable intermediate joint, manufacturing and using method |
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| CN202011101732.1A CN112152182A (en) | 2020-10-15 | 2020-10-15 | Fire-resistant protection device for cable intermediate joint, manufacturing and using method |
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| CN110940895A (en) * | 2019-12-17 | 2020-03-31 | 四川赛康智能科技股份有限公司 | Cable joint explosion-proof fire-extinguishing and temperature, partial discharge comprehensive on-line monitoring device |
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| CN104283179A (en) * | 2014-09-11 | 2015-01-14 | 泰兴市圣达铜业有限公司 | Middle connection device and method for cables of 35kV or below |
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