High-temperature-resistant compensating lead

Abstract

The utility model belongs to the technical field of compensating leads, and particularly relates to a high-temperature-resistant compensating lead, which comprises a body, an inner core of the body is provided with two conductors which are respectively a positive electrode and a negative electrode, an inner insulating layer is coated outside the conductors, and the high-temperature-resistant compensating lead further comprises a flame-retardant filling layer and an armor layer which are coated outside the inner insulating layer, the flame-retardant filling layer is filled with magnesium oxide powder, and the armor layer is a titanium alloy component; the tensile reinforcing layer and the electromagnetic shielding layer are wrapped outside the armor layer, the tensile reinforcing layer is an aramid fiber braid layer, and the electromagnetic shielding layer is a copper-nickel alloy wire braid layer; the outer sheath is coated outside the electromagnetic shielding layer; it can be understood that the magnesium oxide powder filling layer and the polyimide insulating layer are compounded, so that the high-temperature resistance of the wire is improved; the aramid fiber reinforcement layer is combined with the titanium alloy spiral armor layer, so that the tensile strength is improved; and through the copper-nickel shielding layer, the signal transmission error rate is reduced, and the anti-interference capability is enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of compensating conductor technology, and in particular relates to a high-temperature resistant compensating conductor. Background Technology

[0002] Compensating leads are special wires designed specifically for temperature measurement systems (such as thermocouples). Their core function is to extend the "cold junction" of the thermocouple to a temperature-stable position, thus offsetting the impact of ambient temperature fluctuations on measurement accuracy. In industrial temperature measurement (such as steelmaking, chemical, and power industries) and laboratory precision measurements, thermocouples are typically installed in high-temperature or complex environments, while the measuring instruments are located in a normal-temperature control room. In these cases, compensating leads are needed to extend the signal transmission distance.

[0003] Traditional conductors often use single mica tape or organic insulation materials, which are prone to aging and cracking in high-temperature environments above 300℃ for a long time. Their high-temperature resistance needs to be improved. For example, the comparative document CN210073397U only improves heat resistance through a multi-layer composite structure, but does not solve the problem of material delamination caused by thermal expansion.

[0004] When laying conductors, the core wires are easily broken due to external pulling force, resulting in low tensile strength. For example, the comparative document CN222319800U uses steel wire rope to enhance tensile strength, but this increases the weight and cost of the conductors.

[0005] High electromagnetic environments can easily cause signal transmission errors and are sensitive to electromagnetic interference. For example, the prior art document CN222051416U reduces heat accumulation through heat-absorbing material buffer structures, but does not involve electromagnetic shielding design.

[0006] To address the aforementioned issues, this application proposes a high-temperature resistant compensating conductor. Utility Model Content

[0007] The purpose of this invention is to provide a high-temperature resistant compensating conductor, which solves the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0009] This utility model relates to a high-temperature resistant compensating wire, comprising a body, wherein the inner core of the body has two conductors, one positive and one negative, and the conductors are covered with an inner insulation layer, and further comprising:

[0010] A flame-retardant filling layer and an armor layer are wrapped around the outer side of the inner insulation layer. The flame-retardant filling layer is filled with magnesium oxide powder, and the armor layer is a titanium alloy component.

[0011] A tensile reinforcement layer and an electromagnetic shielding layer are wrapped around the armor layer. The tensile reinforcement layer is an aramid fiber braided layer, and the electromagnetic shielding layer is a copper-nickel alloy wire braided layer.

[0012] The outer sheath covering the electromagnetic shielding layer.

[0013] Furthermore, the armor layer is spirally arranged, and the pitch length is greater than the width.

[0014] Furthermore, the inner insulating layer is made of polyimide film with a thickness of 0.1 mm.

[0015] Furthermore, the magnesium oxide powder in the flame-retardant filler layer has a particle size ≤50μm.

[0016] Furthermore, the tensile reinforcement layer has a mesh structure with a weaving density of ≥80%.

[0017] Furthermore, the outer surface of the outer sheath is provided with multiple anti-slip ribs 81 distributed circumferentially along the axial direction.

[0018] This utility model has the following beneficial effects:

[0019] This invention improves the high-temperature resistance of the conductor by combining a magnesium oxide powder filling layer with a polyimide insulation layer.

[0020] This invention improves tensile strength by combining an aramid fiber reinforcement layer with a titanium alloy spiral armor layer.

[0021] This invention reduces the signal transmission error rate and enhances anti-interference capability through a copper-nickel shielding layer.

[0022] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall appearance structure of this utility model;

[0025] Figure 2 for Figure 1 Top view of the structure;

[0026] Figure 3 for Figure 1 A side view of the structure;

[0027] Figure 4 This is a schematic diagram of the armor layer structure;

[0028] The attached diagram lists the components represented by each number as follows:

[0029] In the diagram: 1. Body; 2. Conductor; 3. Inner insulation layer; 4. Flame-retardant filling layer; 5. Armor layer; 6. Tensile reinforcement layer; 7. Electromagnetic shielding layer; 8. Outer sheath; 81. Anti-slip rib. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Please see Figure 1 - Figure 4 As shown, this utility model is a high-temperature resistant compensating wire, including a body 1. The inner core of the body 1 has two conductors 2, which are positive and negative poles respectively. The positive conductor is made of nickel-chromium alloy with a diameter of 1.2 mm, and the negative conductor is made of nickel-silicon alloy with a diameter of 1.0 mm. The two are twisted together to form a wire core. The twisting pitch is 12 times the diameter of the positive conductor to match the electromotive force characteristics of different thermocouples such as K-type and S-type, and reduce signal transmission errors. The conductors are subjected to processing stress in a vacuum annealing furnace to improve conductivity. The conductors 2 are covered with an inner insulation layer 3, which is made of polyimide film and coated by a three-layer co-extrusion process. The extrusion temperature is controlled at 280-300℃ to ensure no bubbles and no delamination.

[0033] The inner insulation layer 3 is covered with a flame-retardant filler layer 4 and an armor layer 5. The flame-retardant filler layer 4 is filled with magnesium oxide powder, specifically nano-sized magnesium oxide powder, and a silane coupling agent is added at a mass ratio of 100:1 to improve dispersibility, resulting in a filling density ≥1.8 g / cm³. 3 It has both flame-retardant and heat-conducting functions, and the armor layer 5 is a titanium alloy component.

[0034] The armor layer 5 is covered with a tensile reinforcement layer 6 and an electromagnetic shielding layer 7. The tensile reinforcement layer 6 is an aramid fiber braided layer, which is made of aramid fiber woven into an 80-mesh mesh structure with a braiding density of ≥85%. The surface is coated with high-temperature resistant epoxy resin to make the elongation at break ≤5% and the tensile strength ≥200MPa. The electromagnetic shielding layer 7 is a copper-nickel alloy wire braided layer, which is made of copper-nickel alloy wire with a coverage of ≥90%. An anti-oxidation layer is plated on the outside of the braided layer. The grounding terminal is soldered to the terminal equipment with silver-copper solder to make the signal transmission error rate ≤0.5%.

[0035] The electromagnetic shielding layer 7 is covered with an outer sheath 8, which is made of fluororubber injection molding.

[0036] The armor layer 5 is spirally arranged with a pitch length greater than its width. It is fixed by high-frequency welding to offset thermal expansion stress and enhance compressive strength. The pitch length being greater than the width creates a gap between the layers to ensure the toughness of the conductor.

[0037] Among them, the outer sheath 8 has multiple anti-slip ribs 81 distributed circumferentially along the outer surface along the axial direction, and the anti-slip ribs 81 increase the friction.

[0038] Understandably, the high-temperature resistance of the conductor is improved by combining the magnesium oxide powder filling layer with the polyimide insulation layer; the tensile strength is improved by combining the aramid fiber reinforcement layer with the titanium alloy spiral armor layer; and the signal transmission error rate is reduced and the anti-interference capability is enhanced by the copper-nickel shielding layer.

[0039] The production process of high-temperature compensating conductors can be divided into the following key stages:

[0040] Conductor pretreatment and stranding stage: First, the nickel-chromium alloy positive and negative conductors are cut and vacuum annealed. Then, a twisting machine is used to twist them at a specific pitch to ensure that the outer diameter of the core is controlled within 2.5mm and the surface finish meets the standards.

[0041] Multilayer composite structure preparation stage: A polyimide film is simultaneously coated onto the outer layer of the conductor using a three-layer co-extrusion device, followed by filling with magnesium oxide powder treated with a silane coupling agent and compacting to a density of 1.8 g / cm³. 3 That's all. Next, an aramid fiber woven tensile reinforcement layer is used, and titanium alloy spiral support plates are welded to its outer side at 10cm intervals to enhance compressive strength.

[0042] Shielding and protection stage: An electromagnetic shielding layer is woven from copper-nickel alloy wire and a grounding terminal is welded on. Finally, a fluororubber outer sheath with anti-slip protrusions and longitudinal grooves is applied using injection molding. The finished product undergoes rigorous quality testing, including indicators such as outer diameter tolerance and insulation resistance. After passing the tests, it is packaged and stored using a constant tension winding machine.

[0043] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A high-temperature-resistant compensation conductor, comprising a body (1), a core of which is provided with two conductors (2) of positive and negative poles respectively, and an inner insulation layer (3) is coated outside the conductors (2), characterized in that, Also include: The flame-retardant filling layer (4) filled with magnesium oxide powder and the armored layer (5) of titanium alloy component coated outside the inner insulation layer (3); The tensile reinforcing layer (6) of aramid fiber braid layer and the electromagnetic shielding layer (7) of copper-nickel alloy wire braid layer coated outside the armored layer (5); The outer sheath (8) coated outside the electromagnetic shielding layer (7).

2. The high temperature resistant compensating conductor of claim 1, wherein: The armored layer (5) is spirally arranged, and the pitch length is greater than the width.

3. The high temperature resistant compensating conductor of claim 1, wherein: The inner insulation layer (3) adopts polyimide film with a thickness of 0.1mm.

4. The high temperature resistant compensating conductor of claim 1, wherein: The particle size of magnesium oxide powder in the flame-retardant filling layer (4) is ≤50μm.

5. The high temperature resistant compensating conductor of claim 1, wherein: The tensile reinforcing layer (6) is a mesh structure with a weaving density ≥80%.

6. The high temperature resistant compensating conductor of claim 1, wherein: The outer surface of the outer sheath (8) is provided with multiple anti-skid ribs (81) circumferentially distributed along the axial direction.

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