Coaxial detection cable

Abstract

The utility model discloses a coaxial detection cable, which comprises a conductor, a sheath layer and a sheath tube, the sheath layer and the sheath tube are coaxially and sequentially arranged on the outer side of the conductor, and a polyether-ether-ketone insulating layer, a second insulating layer and a third insulating layer are sequentially arranged between the conductor and the sheath layer. A first wrapping layer, a first shielding layer and a second wrapping layer are sequentially arranged between the second insulating layer and the third insulating layer, and a plurality of reinforcing cores which are arranged at intervals in the circumferential direction are arranged at the joint of the second insulating layer tightly wrapping the outer side of the polyether-ether-ketone insulating layer and the polyether-ether-ketone insulating layer. And the polyether-ether-ketone insulating layer and the second insulating layer are respectively and tightly coated on the outer side of the reinforcing core. According to the utility model, the cable has good anti-interference and electrical performance, the stretch resistance and bending resistance are improved, and the binding force and stability between the two layers of insulation are improved, thereby further improving the detection precision and stability in a complex environment.

Description

Technical Field

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

[0002] Neutron detectors are one of the essential components of nuclear reactors. They are used to monitor the neutron injection rate of nuclear reactors to adjust the insertion depth of control rods and the concentration of moderators, so as to control the reactor power and ensure safe operation. Neutron detectors are divided into ex-pile neutron detectors and in-pile neutron detectors. In-pile neutron detectors are set inside the core in a harsh environment. They are responsible for detecting the burnup level of each burnup component, monitoring the distribution of neutron injection rate, calibrating external instruments, detecting hot spot factors, and inspecting loading conditions. Therefore, the requirements for in-pile neutron detectors are higher. Similarly, as the core component of the neutron detector during use, the performance of the signal transmission cable 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 detection cable, which has good anti-interference and electrical properties, improved tensile and bending resistance, and improved bonding strength and stability between double-layer insulation, thereby further improving the accuracy and stability of detection in complex environments.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a coaxial detection cable, comprising: a conductor and a coaxial sheath layer and a sheath tube arranged on the outside of the conductor in sequence, a polyetheretherketone insulation layer, a second insulation layer and a third insulation layer are arranged in sequence between the conductor and the sheath layer, a first wrapping layer, a first shielding layer and a second wrapping layer are arranged in sequence between the second insulation layer and the third insulation layer, and a plurality of circumferentially spaced reinforcing cores are arranged at the connection between the second insulation layer tightly wrapped on the outside of the polyetheretherketone insulation layer and the polyetheretherketone insulation layer, and the polyetheretherketone insulation layer and the second insulation layer are each tightly wrapped on the outside of the reinforcing core.

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

[0006] 1. In the above solution, the reinforcing core is formed by twisting at least one of steel wires and aramid wires.

[0007] 2. In the above scheme, an inner sheath formed by overlapping and winding a wrapping tape on the outer surface of the conductor is provided between the conductor and the polyetheretherketone insulation layer, and the wrapping tape is a polyimide tape.

[0008] 3. In the above solution, a third wrapping layer and a second shielding layer are sequentially arranged between the third insulating layer and the sheath layer.

[0009] 4. In the above solution, the sheath tube is a stainless steel corrugated tube, and the density of the corrugations is not less than 27 corrugations per 100 mm.

[0010] 5. In the above solution, a braided protective layer is provided on the outside of the sheath tube.

[0011] 6. In the above solution, the braided protective layer is woven from stainless steel wire, and the braiding density is not less than 90%.

[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 detection cable, wherein a polyetheretherketone insulation layer, a second insulation layer and a third insulation layer are sequentially arranged between the conductor and the sheath layer, wherein a first winding layer, a first shielding layer and a second winding layer are sequentially arranged between the second insulation layer and the third insulation layer, and a plurality of reinforcing cores arranged at intervals along the circumferential direction are arranged at the connection between the second insulation layer tightly wrapped around the outside of the polyetheretherketone insulation layer and the polyetheretherketone insulation layer, wherein the polyetheretherketone insulation layer and the second insulation layer are each tightly wrapped around the outside of the reinforcing core, and thus the cable has good anti-interference and electrical properties, and has improved tensile and bending resistance, and also improves the bonding strength and stability between the double-layer insulation, thereby further improving the accuracy and stability of detection in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 This is a schematic diagram of the structure of the coaxial detection cable of the utility model;

[0015] Attached Figure 2 It is a schematic diagram of the local structure of the coaxial detection cable of the utility model.

[0016] In the above figures: 1. conductor; 2. wrapping tape; 3. polyetheretherketone insulation layer; 4. second insulation layer; 5. first wrapping layer; 6. first shielding layer; 7. second wrapping layer; 8. third insulation layer; 9. third wrapping layer; 10. second shielding layer; 11. sheath layer; 12. sheath tube; 13. braided protective layer; 14. reinforcing core. DETAILED DESCRIPTION

[0017] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0018] Embodiment 1: A coaxial detection cable for transmitting the working voltage and signal of a neutron detector in a nuclear power plant, comprising: a conductor 1 and a sheath layer 11 and a sheath tube 12 coaxially arranged on the outside of the conductor 1 in sequence, a polyetheretherketone insulation layer 3, a second insulation layer 4 and a third insulation layer 8 are arranged in sequence between the conductor 1 and the sheath layer 11, a first wrapping layer 5, a first shielding layer 6 and a second wrapping layer 7 are arranged in sequence between the second insulation layer 4 and the third insulation layer 8, a plurality of reinforcing cores 14 arranged at intervals along the circumferential direction are arranged at the connection between the second insulation layer 4 tightly wrapped on the outside of the polyetheretherketone insulation layer 3 and the polyetheretherketone insulation layer 3, and the polyetheretherketone insulation layer 3 and the second insulation layer 4 are each tightly wrapped on the outside of the reinforcing core 14.

[0019] The reinforcing core 14 is formed by twisting at least one of steel wire and aramid wire;

[0020] An inner sheath formed by overlapping and winding a wrapping tape 2 on the outer surface of the conductor 1 is arranged between the conductor 1 and the polyetheretherketone insulation layer 3, and the wrapping tape 2 is a polyimide tape;

[0021] A third wrapping layer 9 and a second shielding layer 10 are sequentially arranged between the third insulating layer 8 and the sheath layer 11;

[0022] The conductor 1 is a tinned copper conductor;

[0023] 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;

[0024] The third insulating layer 8 is a double-layer co-extruded insulating layer of radiation cross-linked polyethylene and radiation cross-linked polyolefin, and the semi-finished product after extrusion is subjected to radiation cross-linking treatment by an electron accelerator;

[0025] 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%.

[0026] Embodiment 2: A coaxial detection cable comprises: a conductor 1 and a sheath layer 11 and a sheath tube 12 which are coaxially arranged on the outside of the conductor 1 in sequence, a polyetheretherketone insulation layer 3, a second insulation layer 4 and a third insulation layer 8 are arranged in sequence between the conductor 1 and the sheath layer 11, a first wrapping layer 5, a first shielding layer 6 and a second wrapping layer 7 are arranged in sequence between the second insulation layer 4 and the third insulation layer 8, a plurality of reinforcing cores 14 which are arranged at intervals along the circumferential direction are arranged at the connection between the second insulation layer 4 tightly wrapped on the outside of the polyetheretherketone insulation layer 3 and the polyetheretherketone insulation layer 3, and the polyetheretherketone insulation layer 3 and the second insulation layer 4 are each tightly wrapped on the outside of the reinforcing core 14.

[0027] The sheath pipe 12 is an H-shaped 316L austenitic stainless steel corrugated pipe, and the density of the corrugations is not less than 27 corrugations per 100 mm;

[0028] A braided protective layer 13 is disposed outside the sheath tube 12; the braided protective layer 13 is braided from 316L austenitic stainless steel wire, and the braiding density is not less than 90%;

[0029] The conductor 1 is a silver-plated copper conductor;

[0030] The above-mentioned sheath layer 11 is a radiation cross-linked polyolefin sheath layer, and the semi-finished product after extrusion is subjected to radiation cross-linking treatment by an electron accelerator.

[0031] The above-mentioned coaxial detection cable has good anti-interference and electrical properties, improved tensile and bending resistance, and improved the bonding strength and stability between the double-layer insulation, thereby further improving the accuracy and stability of detection in complex environments.

[0032] 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 detection cable, comprising: A conductor (1) and a sheath layer (11) and a sheath tube (12) are coaxially arranged on the outside of the conductor (1), characterized in that: a polyetheretherketone insulation layer (3), a second insulation layer (4) and a third insulation layer (8) are arranged in sequence between the conductor (1) and the sheath layer (11); a first wrapping layer (5), a first shielding layer (6) and a second wrapping layer (7) are arranged in sequence between the second insulation layer (4) and the third insulation layer (8); a plurality of reinforcing cores (14) arranged at intervals in the circumferential direction are arranged at the connection between the second insulation layer (4) and the polyetheretherketone insulation layer (3) which are tightly wrapped on the outside of the polyetheretherketone insulation layer (3); and the polyetheretherketone insulation layer (3) and the second insulation layer (4) are each tightly wrapped on the outside of the reinforcing core (14).

2. The coaxial detection cable according to claim 1, characterized in that: The reinforcing core (14) is formed by twisting at least one of steel wires and aramid wires.

3. The coaxial detection cable according to claim 1, characterized in that: An inner sheath is provided between the conductor (1) and the polyetheretherketone insulation layer (3), and is formed by a wrapping tape (2) wrapped around the outer surface of the conductor (1), and the wrapping tape (2) is a polyimide tape.

4. The coaxial detection cable according to claim 1, characterized in that: A third wrapping layer (9) and a second shielding layer (10) are arranged in sequence between the third insulating layer (8) and the sheath layer (11).

5. The coaxial detection cable according to claim 1, characterized in that: The sheath pipe (12) is a stainless steel corrugated pipe, and the density of the corrugations is not less than 27 corrugations per 100 mm.

6. The coaxial detection cable according to claim 1 or 5, characterized in that: A braided protective layer (13) is provided on the outside of the sheath tube (12).

7. The coaxial detection cable according to claim 6, characterized in that: The braided protective layer (13) is braided from stainless steel wires, and the braiding density is not less than 90%.

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