Low temperature resistant instrument cable

Abstract

The utility model relates to instrument cable technical field provides a kind of low temperature resistant instrument cable, including lead core and the shielding layer of its outside;The outside of the shielding layer is equipped with the sheath structure of inside and outside layering, including inner sheath and outer sheath;Spiral skeleton is equipped between the inner sheath and outer sheath, is spiral winding installation;The spiral skeleton includes winding tape one and winding tape two, and the winding tape one and winding tape two are axially close to each other;Hollow tube is embedded between the winding tape one and winding tape two. Through the spiral winding installation of spiral skeleton, hollow tube is built-in in the outer layer structure inside cable, promote heat in hollow tube axial conduction by the temperature difference of cable two end control chamber, to realize the effect of enhancing low temperature resistant performance, it can also be connected external heat source by hollow tube cooperation adapter module and forced heating, further enhance the low temperature resistant performance of cable.

Description

Technical Field

[0001] This utility model relates to the field of instrument cable technology, and more specifically, to a low-temperature resistant instrument cable. Background Technology

[0002] Instrumentation cables are low-voltage, small-signal transmission cables specifically designed to connect field instruments (such as temperature sensors, pressure transmitters, flow meters, valve positioners, etc.) to control systems (such as DCS, PLC). They act as the "neural network" of industrial automation systems, responsible for transmitting crucial process control signals and data.

[0003] Currently, the low-temperature resistance of cables largely depends on the low-temperature resistance of their own materials. However, the low-temperature resistance of materials can be affected by long-term use in low-temperature conditions, leading to a decrease in overall low-temperature resistance and thus affecting the normal use of the cable.

[0004] To address the aforementioned problems, this application proposes a low-temperature resistant instrument cable. Utility Model Content

[0005] The purpose of this invention is to provide a low-temperature resistant instrument cable, which solves the problem that the low-temperature resistance of cables in the prior art depends on the material properties of the cables themselves.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] A low-temperature resistant instrument cable includes a conductor core and an outer shielding layer;

[0008] The outer side of the shielding layer is provided with an inner and outer layered sheath structure, including an inner sheath and an outer sheath;

[0009] A spiral skeleton is provided between the inner and outer sheaths for spiral winding installation;

[0010] The spiral skeleton includes a first winding strip and a second winding strip, which are axially close to each other.

[0011] A hollow tube is embedded between the first and second winding tapes.

[0012] Preferably, the opposite surfaces of the first and second winding strips are both inclined slope structures, and semi-circular grooves are opened inside the two inclined slopes, which are respectively the embedding groove and the pressing groove.

[0013] Preferably, the groove opening faces outward at an angle, the pressing groove opening faces inward at an angle, and the groove and the pressing groove are joined together to form a circular groove structure.

[0014] Preferably, the hollow tube is filled with dry nitrogen gas.

[0015] Preferably, one end of the guide core is provided with an adapter module, and the adapter modules are installed in pairs inside the stripping area of ​​the outer sheath.

[0016] Preferably, the adapter module has an internal branch pipe, one end of which is connected to an external heat source and the other end is connected to a hollow pipe.

[0017] Preferably, the outer side of the inner sheath is provided with a reflective layer, located inside the spiral skeleton.

[0018] The beneficial effects of this utility model are:

[0019] 1. By winding the spiral skeleton and utilizing the combination of its internal hollow tube and adapter module, it can connect to an external heat source to heat the cable, ensuring the stability of the cable performance during long-term use and under extreme low temperature conditions.

[0020] 2. Through the spiral winding of the spiral skeleton, structural support and protection can be formed in the area near the outside of the cable. This not only protects the structural integrity of the hollow tube, but also enhances the cable's resistance to external forces and tensile strength. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the cable of this utility model;

[0023] Figure 2 This is a schematic diagram of the planar structure of one side of the cable of this utility model;

[0024] Figure 3 This is a partially enlarged structural diagram of part A of this utility model;

[0025] Figure 4 This is a schematic diagram of the connection between the adapter module and the hollow tube of this utility model.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] In the diagram: 1. Conductor core; 2. Shielding layer; 31. Inner sheath; 32. Outer sheath; 4. Spiral skeleton; 41. Winding tape one; 411. Embedded groove; 42. Winding tape two; 421. Pressing groove; 43. Hollow tube; 5. Reflective layer; 6. Adapter module; 61. Branch pipe. Detailed Implementation

[0028] 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 protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "opening", "top and bottom", "thickness", "top", "middle", "length", "inner" and "around" indicate the orientation or positional relationship 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.

[0030] A low-temperature resistant instrument cable is designed to enhance the low-temperature resistance of instrument cables. It is installed by spiral winding of a spiral skeleton 4, with a hollow tube 43 built into the outer structure of the cable. The temperature difference between the control chambers at both ends of the cable promotes axial heat conduction within the hollow tube 43, thereby enhancing the low-temperature resistance. It can also be connected to an external heat source through the hollow tube 43 in conjunction with the transfer module 6 for forced heating, further enhancing the low-temperature resistance.

[0031] In some embodiments, the specific structure of the cryogenic instrument cable is as follows: Figure 1-4 As shown, it includes the conductor core 1 and the shielding layer 2 on its outer side;

[0032] The outer layer of the cable is a sheath structure, including an inner sheath 31 and an outer sheath 32, with a spiral skeleton 4 and a reflective layer 5 disposed between them;

[0033] The spiral skeleton 4 includes a first winding tape 41 and a second winding tape 42, which are spirally wound and installed on the outside of the inner sheath 31, with the two axially close to each other.

[0034] Furthermore, a hollow tube 43 is provided between the first winding tape 41 and the second winding tape 42. After the cable production is completed or a fixed length is cut, dry nitrogen gas is filled into the hollow tube 43 and then sealed.

[0035] It should be noted that the two ends or one end of the cable are connected to the control room. By utilizing the temperature difference between the two ends of the cable or the temperature difference between one end and the middle section of the cable, nitrogen gas near the heat source area can be heated. Then, by utilizing the low-resistance channel in the hollow tube 43, convection between the low-temperature gas and the heated gas is promoted, thereby forming the effect of the heating cable resisting the external low temperature.

[0036] Understandably, the spiral winding installation of the spiral skeleton 4 can evenly distribute the radial pressure applied to the outside of the cable to the entire circumference, avoiding pressure concentration on the fragile inner conductor 1.

[0037] When the cable is pulled axially, the spiral skeleton 4 is first stretched slightly, and after absorbing most of the energy, it can convert the axial tension on the cable into the tensile stress of the skeleton material itself, thereby protecting the internal core from being directly pulled apart.

[0038] Furthermore, the two winding tapes 41 and 42 are respectively provided with a groove 411 and a pressing groove 421 on their adjacent sides;

[0039] Among them, the side of the first winding strip 41 and the second winding strip 42 that are close to each other are inclined, so that the opening of the groove 411 faces outward at an angle, while the opening of the pressure groove 421 faces inward and is opposite to the groove 411.

[0040] It is understandable that during spiral winding installation, the hollow tube 43 can be embedded into the groove 411 and the pressure groove 42 by installing the first winding tape 41, the hollow tube 43, and the second winding tape 42 in sequence.

[0041] It should be noted that the conductor core 1 is preferably made of multiple strands of ultra-fine oxygen-free copper wires twisted together, and the shielding layer 2 is preferably made of aluminum-plastic composite tape wrapped with tin-plated copper wire braided in inner and outer layers.

[0042] 3. Preferably made of thermoplastic polyurethane;

[0043] The spiral skeleton 4 is preferably made of modified polypropylene or polyethylene;

[0044] It should also be noted that after the inner sheath 31 is extruded, the spiral skeleton 4 is spirally wound around the outside, and then co-extruded with the outer sheath 32 to obtain a cable sheath structure with the spiral skeleton 4 inside.

[0045] Furthermore, during the extrusion molding of the outer sheath 32, the wrapping of the hollow tube 43 by the groove 411 and the pressure groove 421 can also form a protective barrier to prevent the hollow tube 43 from being deformed by pressure.

[0046] Optionally, in order to further enhance the low-temperature resistance of the cable, a section of the outer sheath 32 is peeled off from the outside of the cable, exposing the spiral skeleton 4, and then a section of the first winding tape 41 and the second winding tape 42 wrapping the hollow tube 43 are peeled off, exposing the hollow tube 43.

[0047] The two ends of the branch pipe 61 are connected to the hollow pipe 43 and the external heat source equipment respectively, and the two semi-circular transition modules 6 are fitted inside the peeling area of ​​the outer sheath 32 to form a closed ring structure, thereby filling and sealing the peeling area.

[0048] At this point, external heat source equipment can be used to directly supply heat to the interior of the hollow tube 43, achieving the effect of rapid heating of the cable, thereby resisting extreme low temperatures and ensuring the stability of the cable's performance.

[0049] Optionally, in order to further prevent heat loss from the cable, a very thin metallized film, preferably an aluminum-plastic composite film, is plated or wrapped around the outside of the inner sheath 31.

[0050] This layer reduces heat loss by reflecting thermal radiation from inside the cable, and serves as the cable's thermal insulation layer.

[0051] Understandably, the thermal insulation layer can also be used as an insulation layer. When heat is provided from the outside, it can conduct a small amount of heat to the inside of the cable to prevent the cable from overheating, thereby insulating most of the heat from the outside and resisting the intrusion of external low temperatures.

[0052] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" 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, 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.

[0053] 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 low-temperature resistant instrument cable, characterized in that: Includes the conductor (1) and the outer shielding layer (2); The outer side of the shielding layer (2) is provided with an inner and outer layered sheath structure, including an inner sheath (31) and an outer sheath (32). A spiral skeleton (4) is provided between the inner sheath (31) and the outer sheath (32) for spiral winding installation; The spiral skeleton (4) includes a first winding strip (41) and a second winding strip (42), which are axially close to each other; A hollow tube (43) is embedded between the first winding strip (41) and the second winding strip (42).

2. The low-temperature resistant instrument cable according to claim 1, characterized in that: The opposite surfaces of the first winding strip (41) and the second winding strip (42) are both inclined slope structures, and semi-circular grooves are opened inside the two inclined slopes, namely the embedding groove (411) and the pressing groove (421).

3. The low-temperature resistant instrument cable according to claim 2, characterized in that: The groove (411) has an opening that faces outward at an angle, and the pressure groove (421) has an opening that faces inward at an angle. The groove (411) and the pressure groove (421) are connected to each other to form a circular groove structure.

4. The low-temperature resistant instrument cable according to claim 1, characterized in that: The hollow tube (43) is filled with dry nitrogen gas.

5. The low-temperature resistant instrument cable according to claim 1, characterized in that: One end of the guide core (1) is provided with an adapter module (6), and the adapter modules (6) are installed in pairs inside the stripping area of ​​the outer sheath (32).

6. The low-temperature resistant instrument cable according to claim 5, characterized in that: The adapter module (6) has a branch pipe (61) inside, one end of which is connected to an external heat source and the other end is connected to a hollow pipe (43).

7. The low-temperature resistant instrument cable according to claim 1, characterized in that: The outer side of the inner sheath (31) is provided with a reflective layer (5), which is located inside the spiral skeleton (4).

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