Coaxial cable for neutron detector

Abstract

The utility model discloses a coaxial cable for a neutron detector, which comprises a conductor and a sheath layer coaxially arranged on the outer side of the conductor, an inner wrapping layer obtained by winding a wrapping tape is arranged between the conductor and the sheath layer, and the lap joint areas of the wrapping tape wound on the outer side surface of the conductor in an overlapped manner are connected in a bonding manner. A first insulating layer, a second insulating layer, a third insulating layer, a first wrapping layer, a second wrapping layer and a third wrapping layer are arranged between the inner wrapping layer and the sheath layer, and the first insulating layer and the second insulating layer sequentially wrap the inner wrapping layer. A first shielding layer is arranged between the first wrapping layer and the second wrapping layer which are sequentially arranged on the outer side of the second insulating layer, and the outer side of the sheath layer is sleeved with a protection tube. The cable has good anti-interference and electrical performance, can realize stable transmission of signals in a complex environment, and ensures the precision and stability of detection.

Description

Technical Field

[0001] The utility model relates to a coaxial cable for a neutron detector and belongs to the technical field of nuclear power station detection. Background Art

[0002] Neutron detectors are one of the key components of neutron spectrometers, used to detect the microstructure and movement of matter. At present, neutron detectors include three types: proportional counter tubes, compensated ionization chambers, and non-compensated ionization chambers. They are important measuring devices in nuclear measurement systems. The signal output by the neutron detector is very weak, and a precise signal amplifier is required to amplify the signal to a signal that can be collected. The signal transmission cable is the core component of the neutron detector during use, and its performance directly determines the detection performance of the detector. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a coaxial cable for a neutron detector. The coaxial cable for a neutron detector has good anti-interference and electrical properties, can realize stable transmission of signals in complex environments, and ensure the accuracy and stability of detection.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a coaxial cable for a neutron detector, comprising: a conductor and a sheath layer coaxially arranged on the outside of the conductor, an inner sheath obtained by winding with a wrapping tape is arranged between the conductor and the sheath layer, and the overlapping areas of the wrapping tape overlapped and wound on the outer surface of the conductor are adhesively connected, and a first insulating layer, a second insulating layer, a third insulating layer and a first wrapping layer, a second wrapping layer, and a third wrapping layer are respectively arranged between the inner sheath and the sheath layer, the first insulating layer and the second insulating layer are sequentially coated on the outside of the inner sheath, a first shielding layer is arranged between the first wrapping layer and the second wrapping layer sequentially arranged on the outside of the second insulating layer, the third insulating layer and the third wrapping layer are sequentially arranged on the outside of the second wrapping layer, a second shielding layer is arranged between the third wrapping layer and the sheath layer, and a protective tube is sleeved on the outside of the sheath layer.

[0005] The further improved scheme in the above technical scheme is as follows:

[0006] 1. In the above solution, the wrapping tape is a polyimide tape, and the overlapping areas of the wrapping tape are connected by high-temperature sintering.

[0007] 2. In the above solution, the protective tube is a stainless steel corrugated tube, and the density of the corrugations is not less than 27 corrugations per 100 mm.

[0008] 3. In the above solution, a braided protective layer is provided on the outside of the protective tube.

[0009] 4. In the above solution, the braided protective layer is woven from stainless steel wire, and the braiding density is not less than 90%.

[0010] 5. In the above solution, the first shielding layer and the second shielding layer are both formed by stacking a copper-plastic composite tape wrapping layer and a tinned copper wire braided layer.

[0011] 6. In the above solution, the tinned copper wire braided layer in the first shielding layer and the tinned copper wire braided layer in the second shielding layer are arranged facing each other.

[0012] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0013] The utility model provides a coaxial cable for a neutron detector, an inner sheath obtained by winding with a wrapping tape is arranged between the conductor and the sheath layer, the overlapping areas of the wrapping tapes overlapped and wound on the outer surface of the conductor are bonded and connected, a first insulating layer, a second insulating layer, a third insulating layer and a first wrapping layer, a second wrapping layer and a third wrapping layer are arranged between the inner sheath and the sheath layer respectively, the first insulating layer and the second insulating layer are sequentially coated on the outer side of the inner sheath, a first shielding layer is arranged between the first wrapping layer and the second wrapping layer sequentially arranged on the outer side of the second insulating layer, the third insulating layer and the third wrapping layer are sequentially arranged on the outer side of the second wrapping layer, a second shielding layer is arranged between the third wrapping layer and the sheath layer, a protective tube is sleeved on the outer side of the sheath layer, the sheath layer has good anti-interference and electrical properties, can realize stable transmission of signals in complex environments, and ensure the accuracy and stability of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 The utility model is a schematic diagram of the structure of a coaxial cable for a neutron detector.

[0015] In the above figures: 1, conductor; 2, wrapping tape; 3, first insulating layer; 4, second insulating layer; 5, first wrapping layer; 6, first shielding layer; 7, second wrapping layer; 8, third insulating layer; 9, third wrapping layer; 10, second shielding layer; 11, sheath layer; 12, protective tube; 13, braided protective layer. DETAILED DESCRIPTION

[0016] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0017] Embodiment 1: A coaxial cable for a neutron detector, used for transmitting the working voltage and signal of the neutron detector in a nuclear power plant, comprises: a conductor 1 and a sheath layer 11 coaxially arranged on the outside of the conductor 1, an inner sheath obtained by winding a wrapping tape 2 is arranged between the conductor 1 and the sheath layer 11, and the overlapping areas of the wrapping tape 2 overlapped and wrapped on the outer surface of the conductor 1 are bonded and connected, a first insulating layer 3, a second insulating layer 4, a third insulating layer 8 and a first wrapping layer 5, a second wrapping layer 7, and a third wrapping layer 9 are arranged between the inner sheath and the sheath layer 11, respectively, the first insulating layer 3 and the second insulating layer 4 are sequentially coated on the outside of the inner sheath, a first shielding layer 6 is arranged between the first wrapping layer 5 and the second wrapping layer 7 sequentially arranged on the outside of the second insulating layer 4, the third insulating layer 8 and the third wrapping layer 9 are sequentially arranged on the outside of the second wrapping layer 7, a second shielding layer 10 is arranged between the third wrapping layer 9 and the sheath layer 11, and a protective tube 12 is sleeved on the outside of the sheath layer 11.

[0018] The wrapping tape 2 is a polyimide tape, and the overlapping areas of the wrapping tape 2 are connected by high-temperature sintering;

[0019] The protective tube 12 is an H-shaped 316L austenitic stainless steel corrugated tube, and the density of the corrugations is not less than 27 corrugations per 100 mm;

[0020] A braided protective layer 13 is disposed outside the protective tube 12; the braided protective layer 13 is braided from 316L austenitic stainless steel wire, and the braiding density is not less than 90%;

[0021] The conductor 1 is a tinned copper conductor;

[0022] The first insulating layer 3 is a polyetheretherketone insulating layer, which is extruded and coated on the semi-finished product by a high-temperature extruder, and passed through a hot water cooling tank with a water temperature of 90°C to avoid too fast insulation cooling rate, and the insulating layer is required not to have crystallization phenomenon. The second insulating layer 4 is a irradiation cross-linked polyethylene insulating layer, and the insulation eccentricity is ≤10%. After extrusion, the semi-finished product is irradiated and cross-linked by an electron accelerator;

[0023] The third insulating layer 8 is a double-layer co-extruded insulating layer of radiation cross-linked polyethylene and radiation cross-linked polyolefin. After extrusion, the semi-finished product is subjected to radiation cross-linking treatment by an electron accelerator.

[0024] Embodiment 2: A coaxial cable for a neutron detector comprises: a conductor 1 and a sheath layer 11 coaxially arranged on the outside of the conductor 1, an inner sheath obtained by winding a wrapping tape 2 is arranged between the conductor 1 and the sheath layer 11, and the overlapping areas of the wrapping tape 2 overlapped and wrapped on the outer surface of the conductor 1 are bonded and connected, a first insulating layer 3, a second insulating layer 4, a third insulating layer 8 and a first wrapping layer 5, a second wrapping layer 7, and a third wrapping layer 9 are arranged between the inner sheath and the sheath layer 11, respectively, the first insulating layer 3 and the second insulating layer 4 are sequentially coated on the outside of the inner sheath, a first shielding layer 6 is arranged between the first wrapping layer 5 and the second wrapping layer 7 sequentially arranged on the outside of the second insulating layer 4, the third insulating layer 8 and the third wrapping layer 9 are sequentially arranged on the outside of the second wrapping layer 7, a second shielding layer 10 is arranged between the third wrapping layer 9 and the sheath layer 11, and a protective tube 12 is sleeved on the outside of the sheath layer 11.

[0025] The wrapping tape 2 is a polyimide tape, and the overlapping areas of the wrapping tape 2 are connected by high-temperature sintering;

[0026] The first shielding layer 6 and the second shielding layer 10 are both formed by stacking a copper-plastic composite tape wrapping layer and a tinned copper wire braided layer, the wrapping overlap rate of the copper-plastic composite tape wrapping layer is not less than 25%, and the braiding density of the tinned copper wire braided layer is not less than 90%; the tinned copper wire braided layer in the first shielding layer 6 and the tinned copper wire braided layer in the second shielding layer 10 are arranged opposite to each other;

[0027] The conductor 1 is a copper conductor; the first wrapping layer 5, the second wrapping layer 7 and the third wrapping layer 9 are all formed by overlapping wrapping of polyimide tapes, and the wrapping overlap rate is not less than 40%;

[0028] The above-mentioned sheath layer 11 is a radiation cross-linked polyolefin sheath layer. After extrusion, the semi-finished product is irradiated and cross-linked by an electron accelerator, and has the characteristics of compression resistance, tensile resistance, corrosion resistance and wear resistance;

[0029] The cable as a whole has good electrical properties, anti-electromagnetic interference and low noise characteristics, as well as the characteristics of flame retardancy, low smoke, halogen-free, flood-proof, and good bending flexibility. It can be used normally for 60 years under the condition of a long-term working temperature of 50°C. It can also withstand the radiation of γ-rays with a cumulative dose of 600kGy and β-rays with a cumulative dose of 2100kGy. It can withstand DBA and DBA working condition simulation tests with a maximum temperature of 226°C and a maximum pressure of 563.7kPa accompanied by chemical spraying for 115 days.

[0030] The coaxial cable for neutron detectors has good anti-interference and electrical properties, can realize stable signal transmission in complex environments, and ensure the accuracy and stability of detection.

[0031] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A coaxial cable for a neutron detector, comprising: A conductor (1) and a sheath layer (11) coaxially arranged on the outside of the conductor (1), characterized in that an inner sheath obtained by winding a wrapping tape (2) is arranged between the conductor (1) and the sheath layer (11), the wrapping tape (2) wrapped on the outer surface of the conductor (1) is overlapped and connected with each other by bonding, and a first insulating layer (3), a second insulating layer (4), a third insulating layer (8) and a first wrapping layer (5), a second wrapping layer (7), a third wrapping layer are arranged between the inner sheath and the sheath layer (11). (9), the first insulating layer (3) and the second insulating layer (4) are sequentially coated on the outside of the inner wrapping layer, a first shielding layer (6) is arranged between the first wrapping layer (5) and the second wrapping layer (7) which are sequentially arranged on the outside of the second insulating layer (4), the third insulating layer (8) and the third wrapping layer (9) are sequentially arranged on the outside of the second wrapping layer (7), a second shielding layer (10) is arranged between the third wrapping layer (9) and the sheath layer (11), and a protective tube (12) is sleeved on the outside of the sheath layer (11).

2. The coaxial cable for neutron detector according to claim 1, characterized in that: The wrapping tape (2) is a polyimide tape, and overlapping areas of the wrapping tape (2) are connected by high-temperature sintering.

3. The coaxial cable for neutron detector according to claim 1, characterized in that: The protective tube (12) is a stainless steel corrugated tube, and the density of the corrugations is not less than 27 corrugations per 100 mm.

4. The coaxial cable for neutron detector according to claim 1 or 3, characterized in that: A braided protective layer (13) is provided on the outer side of the protective tube (12).

5. The coaxial cable for neutron detector according to claim 4, characterized in that: The braided protective layer (13) is braided from stainless steel wires, and the braiding density is not less than 90%.

6. The coaxial cable for neutron detector according to claim 1, characterized in that: The first shielding layer (6) and the second shielding layer (10) are both formed by stacking a copper-plastic composite tape wrapping layer and a tinned copper wire braiding layer.

7. The coaxial cable for neutron detector according to claim 6, characterized in that: The tinned copper wire braided layer in the first shielding layer (6) and the tinned copper wire braided layer in the second shielding layer (10) are arranged facing each other.

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