CN211208061U - High temperature resistant compensation cable for thermocouple - Google Patents

Abstract

The utility model discloses a high temperature resistant compensation cable for thermocouple, including compensation cable core, fillet quadrangle shielding net frame, power cable core, signal transmission cable core, aerogel felt area, polyimide composite insulation layer, circular shielding net frame and ceramic silicone rubber layer, the center of the compensation cable core is provided with a supporting foam cylinder, the supporting foam cylinder is provided with a compensation wire and a spacing foam cylinder all around, the inner core of the compensation wire is twisted by a positive wire and a negative wire, the outer wire-wound composite mica tape of the inner core of the compensation wire and nickel-plated copper wire braid shielding net; the fillet quadrilateral shielding net frame and the circular shielding net frame are both provided with single-core copper grounding wires, and the aerogel felt belt is internally filled with a thermoplastic polyethylene rubber layer. The utility model discloses a multilayer shielding and multilayer mode that insulates against heat will compensate wire and the integrated cable to of all the other cable cores, form a comprehensive cable who is adapted to thermocouple measurement field, and its high temperature resistant, compliance are good, and have the latent matter that improves thermocouple measurement length and accuracy.

Description

High temperature resistant compensation cable for thermocouple

Technical Field

The utility model relates to a special type cable technical field especially relates to a high temperature resistant compensating cable for thermocouple.

Background

The compensation lead for the thermocouple is used for extending the cold end of the thermocouple and is connected with a temperature measuring instrument to form a temperature measuring system. The best material at present is a cable which adopts polytetrafluoroethylene as insulation and a sheath, and the use temperature is between minus 60 ℃ and 250 ℃.

With the development of modern military and civil use, equipment and power technologies are developed, and the requirement on high temperature resistance is improved, so that the rated working temperature of the cable is required to be improved, accurate temperature measurement among various devices in a high-temperature severe environment is met, and the requirement on a special environment is far from being met at a high temperature of 250 ℃.

If the temperature of the cable is required to be 600 ℃ near an industrial furnace, the temperature of the cable may need to be about 800 ℃ or even over 1000 ℃ in the missile guidance signal transmission or missile launching process, under the condition, the common polytetrafluoroethylene insulating sheath is completely not suitable, and the direct connection of the cable wrapped by the inorganic ceramic leads to the overweight of the cable, poor bending flexibility and is not beneficial to thermocouple measurement in a longer distance.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a high-temperature-resistant compensation cable for a thermocouple.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a high-temperature-resistant compensation cable for a thermocouple sequentially comprises a compensation cable core, a rounded quadrilateral shielding net frame tightly sleeved outside the compensation cable core, a power cable core and a signal transmission cable core which are distributed outside the rounded quadrilateral shielding net frame, and an aerogel felt belt wound outside the power cable core and the signal transmission cable core from inside to outside, the composite insulation layer is wrapped outside the aerogel felt belt, the circular shielding net frame is tightly sleeved outside the polyimide composite insulation layer, and the ceramic silicon rubber layer is extruded outside the circular shielding net frame; and then the thermoplastic polyethylene rubber is melted briefly at 300 ℃ and then permeates into the fillet quadrilateral shielding net frame;

the inner core of the compensation wire is in a round-angle rectangular structure formed by tightly and oppositely twisting an anode wire and a cathode wire, the anode wire and the cathode wire are both formed by twisting a plurality of strands of alloy wires and externally extruding an ethylene propylene rubber insulating sheath, the material, the color and the thickness of the sheath of the anode wire and the cathode wire must accord with the GB/T4989-94 standard, a composite mica tape is wound outside the inner core of the compensation wire, and a nickel-plated copper wire braided shielding net is wound outside the composite mica tape;

the fillet quadrilateral shielding mesh frame is of an interlayer structure formed by constructing a double-layer fillet quadrilateral copper mesh through copper wires, a slightly long edge of a compensation wire is parallel to the edge of the fillet quadrilateral shielding mesh frame, and four single-core copper grounding wires are arranged at four vertex angles of the fillet quadrilateral shielding mesh frame;

the power cable core is positioned in the center of four sides of the outer layer net of the fillet quadrilateral shielding net frame, two signal transmission cable cores are distributed along one power cable core in central symmetry, the power cable core consists of a single-core tinned copper wire and a polytetrafluoroethylene insulating sheath extruded outside the single-core tinned copper wire, and the signal transmission cable core consists of a conductor core formed by twisting a plurality of strands of tinned copper wires, a polytetrafluoroethylene insulating sheath extruded outside the conductor core and a copper strip layer wrapped outside the polytetrafluoroethylene insulating sheath; thermoplastic polyethylene rubber layers are also filled in gaps among the power cable cores, the signal transmission cable cores and the rounded quadrilateral shielding net frames; and then the thermoplastic polyethylene rubber is melted briefly at 300 ℃ and then permeates into the fillet quadrilateral shielding net frame;

the polyimide composite insulating layer is specifically an insulating skin structure with a smooth cylindrical surface, which is formed by wrapping a polyimide composite belt and then melting and packaging at a high temperature of 580 ℃;

the circular shielding net frame is of an interlayer structure formed by a double-layer cylindrical copper net through a copper wire framework, and four single-core copper grounding wires distributed along the supporting foam cylinder in an annular mode are arranged in an interlayer of the circular shielding net frame.

Preferably, the positive lead and the negative lead of the compensation lead are stranded together by 7 strands of alloy wires in a pressing type stranding mode, and the stranding pitch ratio is 10-12 times. Specifically, the conductor of the compensating conductor is twisted together with 7 strands of alloy wires by a 300-type wire twisting machine, the die is a polycrystalline die, and the pitch ratio is controlled to be 10-12 times.

Preferably, the composite mica tape is calcined composite mica with the thickness of 0.14mm, the lapping rate is 50%, and the composite mica is formed by tightly weaving the mica tape and high-temperature-resistant 95D quartz fiber. The composite mica tape provides a primary heat insulation effect, and the internal and external temperatures of the compensation lead can be basically separated under the multi-layer heat insulation effect of the thermoplastic polyethylene rubber layer, the aerogel felt tape, the polyimide composite insulating layer and the ceramic silicon rubber layer, so that the accuracy of thermocouple measurement is greatly improved.

Preferably, the nickel-plated copper wire braided shielding net is braided by a nickel-plated copper wire with the diameter of 0.15mm, the braiding density is not less than 85%, the nickel-plated copper wire with the diameter of 0.15mm is braided as a shielding layer by a 16-ingot braiding machine in actual production, the shielding density is not less than 85%, the nickel-plated copper wire braided shielding net provides primary shielding of a compensation wire, and the purpose is to shield signal interference between the compensation wire and a power cable core and between the compensation wire and a signal transmission cable core under the secondary shielding effect of a fillet quadrilateral shielding net frame, so that the compensation wire, the power cable core and the signal transmission cable core can be possibly integrated together, and a comprehensive cable suitable for the field of thermocouple measurement is formed. The utility model discloses the benefit that so sets up lies in: on the compensation wire wiring distance of overlength, temperature transmitter is connected at the wiring intermediate position to accessible power cable core, signal transmission cable core, and power cable core, signal transmission cable core just in time provide electric energy and signal transmission's function for temperature transmitter, thereby make the utility model discloses a compensation cable is fit for longer distance's compensation wire.

Preferably, all single core copper earth connection are parallel to each other and unanimous with the axial of compensation cable, weave all single core copper earth connection and nickel-plated copper wire shielding net ground simultaneously during the use to guarantee that the shielding layer is effectively shielded, the effect of shielding layer ungrounded is that, shielding layer wire probably has different regions to produce little electromotive force because the influence of temperature, ambient signal, this little electromotive force is not less than the little electromotive force that the thermocouple produced, so the shielding must ground connection, and each part that will shield the layer all will ground connection, avoid the influence of shielding layer to the thermocouple.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model adopts the mode of multilayer shielding and multilayer heat insulation, and integrates the compensation lead, the rest power cable cores and the signal transmission cable cores into the same cable, thereby forming a comprehensive cable suitable for the thermocouple measurement field;

the utility model adopts the three-level grounding shield of the nickel-plated copper wire braided shield net, the fillet quadrilateral shield net frame and the circular shield net frame, so that the compensation wire is basically not interfered by the external environment of the cable and other internal electric signals during measurement, and a signal converter such as a temperature transmitter or a signal amplifier or a signal transmitter thereof can be added midway during wiring, thereby prolonging the measurement distance of the thermocouple;

the utility model discloses a multilayer heat insulation structure of compound mica tape-thermoplastic polyethylene rubber layer-aerogel felt area-polyimide composite insulation layer-ceramic silicone rubber layer can make the inside and outside temperature of compensation wire keep basic separation, not only improves the accuracy that the thermocouple measured greatly, has still improved the service temperature range of cable, and temperature resistant is higher for ordinary compensation wire for the thermocouple, still keeps the thermoelectromotive force qualified under 500 ℃ high temperature, is fit for using for a long time;

additionally, the utility model discloses a cable still has characteristics softer, that the flexibility is strong and be convenient for install.

Drawings

Fig. 1 is a schematic structural view of a high temperature resistant compensation cable for a thermocouple according to the present invention;

in the figure: the cable comprises a compensation cable core 1, a supporting foam cylinder 101, a compensation wire 102, a composite mica tape 102A, a nickel-plated copper wire braided shielding net 102B, a limiting foam cylinder 103, a thermoplastic polyethylene rubber layer 104, a fillet quadrilateral shielding net frame 2, a power cable core 3, a signal transmission cable core 4, an aerogel felt tape 5, a polyimide composite insulating layer 6, a circular shielding net frame 7, a ceramic silicon rubber layer 8 and a single-core copper grounding wire 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1, a high temperature resistant compensation cable for a thermocouple comprises, from inside to outside, a compensation cable core 1, a rounded quadrilateral shielding frame 2 tightly sleeved outside the compensation cable core 1, a power cable core 3 and a signal transmission cable core 4 distributed outside the rounded quadrilateral shielding frame 2, an aerogel felt belt 5 wound outside the power cable core 3 and the signal transmission cable core 4, a polyimide composite insulating layer 6 wrapped outside the aerogel felt belt 5, a circular shielding frame 7 tightly sleeved outside the polyimide composite insulating layer 6, and a ceramic silicone rubber layer 8 extruded outside the circular shielding frame 7, wherein a supporting foam cylinder 101 is arranged at the center of the compensation cable core 1, four compensation wires 102 are symmetrically arranged around the supporting foam cylinder 101, a limiting foam cylinder 103 is further arranged between adjacent compensation wires 102, and the supporting foam cylinder 101 is provided with a ceramic silicone rubber layer 8, A thermoplastic polyethylene rubber layer 104 is filled in a gap between the compensating lead 102 and the limiting foam cylinder 103; and then the thermoplastic polyethylene rubber is melted briefly at 300 ℃ and then permeates into the fillet quadrilateral shielding net frame 2; the inner core of the compensation lead 102 is in a round-angle rectangular structure formed by tightly and oppositely twisting an anode lead and a cathode lead, the anode lead and the cathode lead are both formed by twisting a plurality of strands of alloy wires and externally extruding ethylene propylene rubber insulating skins, the material, the color and the thickness of the cladding of the anode lead and the cathode lead must meet the GB/T4989-94 standard, a composite mica tape 102A is wound outside the inner core of the compensation lead 102, and a nickel-plated copper wire braided shielding net 102B is wound outside the composite mica tape 102A; the fillet quadrilateral shielding mesh frame 2 is of a sandwich structure formed by a double-layer fillet quadrilateral copper mesh and a copper wire framework, a slightly long edge of the compensation lead 102 is parallel to the edge of the fillet quadrilateral shielding mesh frame 2, and four single-core copper grounding wires 9 are arranged at four vertex angles of the fillet quadrilateral shielding mesh frame 2; the power cable core 3 is positioned at the center of four sides of an outer layer of the fillet quadrilateral shielding net frame 2, the two signal transmission cable cores 4 are distributed along one power cable core 3 in a central symmetry manner, the power cable core 3 consists of a single-core tinned copper conductor and a polytetrafluoroethylene insulating sheath extruded outside the single-core tinned copper conductor, and the signal transmission cable core 4 consists of a conductor core formed by twisting a plurality of strands of tinned copper wires, a polytetrafluoroethylene insulating sheath extruded outside the conductor core and a copper strip layer wound outside the polytetrafluoroethylene insulating sheath; thermoplastic polyethylene rubber layers 104 are also filled in gaps among the power cable cores 3, the signal transmission cable cores 4 and the rounded quadrilateral shielding net frames 2; and then the thermoplastic polyethylene rubber is melted briefly at 300 ℃ and then permeates into the fillet quadrilateral shielding net frame 2; the polyimide composite insulating layer 6 is specifically an insulating skin structure with a smooth cylindrical surface, which is formed by wrapping a polyimide composite belt and then melting and packaging at a high temperature of 580 ℃; the circular shielding net frame 7 is of an interlayer structure formed by a double-layer cylindrical copper net through a copper wire framework, and four single-core copper grounding wires 9 distributed annularly along the supporting foam cylinder 101 are also arranged in an interlayer of the circular shielding net frame 7.

Referring to fig. 1, the positive electrode lead and the negative electrode lead of the compensation lead 102 are stranded together with 7 strands of alloy wires by adopting a pressing type stranding, and the stranding pitch ratio is 10-12 times. Specifically, the conductor of the compensating conductor is twisted together with 7 strands of alloy wires by a 300-type wire twisting machine, the die is a polycrystalline die, and the pitch ratio is controlled to be 10-12 times.

Referring to fig. 1, the composite mica tape 102A is calcined composite mica with a thickness of 0.14mm, the lapping rate is 50%, and the composite mica is formed by tightly weaving the mica tape and high-temperature-resistant 95D quartz fiber. The composite mica tape 102A provides a primary heat insulation effect, and the internal and external temperatures of the compensation lead 102 can be kept basically separated under the multi-layer heat insulation effect of the thermoplastic polyethylene rubber layer 104, the aerogel felt tape 5, the polyimide composite insulating layer 6 and the ceramic silicon rubber layer 8, so that the accuracy of thermocouple measurement is greatly improved.

Referring to fig. 1, the nickel-plated copper wire braided shield net 102B is braided by nickel-plated copper wires with the diameter of 0.15mm, the braiding density is not less than 85%, in practical production, the nickel-plated copper wires with the diameter of 0.15mm are braided as a shield layer by a 16-ingot braiding machine outside a wire core, the shielding density is not less than 85%, the nickel-plated copper wire braided shield net 102B provides primary shielding of a compensation wire 102, and the purpose is to shield signal interference between the compensation wire 102 and a power cable core 3 and a signal transmission cable core 4 under the secondary shielding effect of a fillet quadrilateral shield net frame 2, so that the compensation wire 102, the power cable core 3 and the signal transmission cable core 4 can be possibly integrated together, and a comprehensive cable suitable for the field of thermocouple measurement is formed. The utility model discloses the benefit that so sets up lies in: on the compensation wire wiring distance of overlength, temperature transmitter is connected at the wiring intermediate position to accessible power cable core 3, signal transmission cable core 4, and power cable core 3, signal transmission cable core 4 just in time provide electric energy and signal transmission's function for temperature transmitter, thereby make the utility model discloses a compensation cable is fit for the compensation wire of longer distance.

Referring to fig. 1, all the single-core copper grounding wires 9 are parallel to each other and are consistent with the axial direction of the compensation cable, and when the compensation cable is used, all the single-core copper grounding wires 9 and the nickel-plated copper wire braided shielding network 102B are grounded simultaneously, so that effective shielding of a shielding layer is ensured, and the result that the shielding layer is not grounded is that different regions of a shielding layer lead may generate micro electromotive force due to the influence of temperature and environmental signals, and the micro electromotive force is not weaker than the micro electromotive force generated by a thermocouple, so that the shielding must be grounded, and all parts of the shielding layer are grounded, so that the influence of the shielding layer on the thermocouple is avoided.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (5)

1. A high temperature resistant compensation cable for a thermocouple comprises a compensation cable core (1), a fillet quadrilateral shielding net frame (2) tightly sleeved outside the compensation cable core (1), a power cable core (3) and a signal transmission cable core (4) distributed outside the fillet quadrilateral shielding net frame (2), an aerogel felt belt (5) wound outside the power cable core (3) and the signal transmission cable core (4), a polyimide composite insulating layer (6) wrapped outside the aerogel felt belt (5), a circular shielding net frame (7) tightly sleeved outside the polyimide composite insulating layer (6) and a ceramic silicon rubber layer (8) extruded outside the circular shielding net frame (7) from inside to outside in sequence, and is characterized in that a supporting foam cylinder (101) is arranged at the center of the compensation cable core (1), four compensation wires (102) with central symmetry are arranged around the supporting foam cylinder (101), a limiting foam cylinder (103) is padded between the adjacent compensation leads (102), and thermoplastic polyethylene rubber layers (104) are filled in gaps among the supporting foam cylinder (101), the compensation leads (102) and the limiting foam cylinder (103); and then the thermoplastic polyethylene rubber is melted briefly at 300 ℃ and then permeates into the fillet quadrilateral shielding net frame (2);

the inner core of the compensation wire (102) is of a round-corner rectangular structure formed by tightly and oppositely twisting an anode wire and a cathode wire, the anode wire and the cathode wire are formed by twisting a plurality of strands of alloy wires and externally extruding and wrapping ethylene propylene rubber insulating skins, a composite mica tape (102A) is wound outside the inner core of the compensation wire (102), and a nickel-plated copper wire braided shielding net (102B) is wound outside the composite mica tape (102A);

the fillet quadrilateral shielding mesh frame (2) is of a sandwich structure formed by a double-layer fillet quadrilateral copper mesh and a copper wire framework, a slightly long edge of the compensation lead (102) is parallel to the edge of the fillet quadrilateral shielding mesh frame (2), and four single-core copper grounding wires (9) are arranged at four vertex angles of the fillet quadrilateral shielding mesh frame (2);

the power cable cores (3) are located at the center positions of four sides of an outer layer net of the fillet quadrilateral shielding net frame (2), the two signal transmission cable cores (4) are distributed in a central symmetry mode along one power cable core (3), the power cable core (3) is composed of a single-core tinned copper conductor and a polytetrafluoroethylene insulating sheath extruded outside the single-core tinned copper conductor, and the signal transmission cable core (4) is composed of a conductor core formed by stranding a plurality of strands of tinned copper wires, a polytetrafluoroethylene insulating sheath extruded outside the conductor core and a copper strip layer wound outside the polytetrafluoroethylene insulating sheath; gaps among the power cable cores (3), the signal transmission cable cores (4) and the rounded quadrilateral shielding net frame (2) are also filled with thermoplastic polyethylene rubber layers (104);

the polyimide composite insulating layer (6) is specifically an insulating skin structure with a smooth cylindrical surface, which is formed by wrapping a polyimide composite belt and then melting and packaging at a high temperature of 580 ℃;

the circular shielding net frame (7) is of a sandwich structure formed by a double-layer cylindrical copper net through a copper wire framework, and four single-core copper grounding wires (9) distributed along the annular shape of the supporting foam cylinder (101) are also arranged in the interlayer of the circular shielding net frame (7).

2. The compensation cable for the high-temperature-resistant thermocouple according to claim 1, wherein a positive conductor and a negative conductor of the compensation conductor (102) are stranded together by pressing type stranding to form 7 strands of alloy wires, and the stranding pitch ratio is 10-12 times.

3. The compensation cable for a high-temperature thermocouple according to claim 1, wherein the composite mica tape (102A) is made of 0.14mm thick calcined composite mica, and the overlapping rate is 50%.

4. The compensating cable for a high-temperature resistant thermocouple according to claim 1, wherein the braided shielding mesh (102B) of nickel-plated copper wire is braided with nickel-plated copper wire having a diameter of 0.15mm, and the braiding density is not less than 85%.

5. A compensation cable for a high-temperature resistant thermocouple according to claim 1, characterized in that all the single-core copper grounding wires (9) are parallel to each other and coincide with the axial direction of the compensation cable.

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