Low-temperature-resistant and high-temperature-resistant instrument cable

Abstract

The instrument cable comprises a sheath layer, the sheath layer is of a hollow pipeline structure, two ends of the sheath layer are provided with openings, the sheath layer comprises an outer sheath layer, an armor layer and an inner sheath layer which are sequentially arranged from outside to inside, and the outer sheath layer and the inner sheath layer are made of halogen-free flame-retardant TPE material pieces; the shielding layer is arranged on the inner side of the inner protection layer; the wrapping layer is arranged on the inner side of the shielding layer; and the core wire layer is arranged at the inner side of the wrapping layer, the core wire layer comprises a plurality of twisted pairs and a grounding lead 1, and the plurality of twisted pairs are uniformly arranged along the circumferential direction of the shielding layer. The instrument cable has the effects of low temperature resistance and high temperature resistance at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to an instrument cable which is resistant to low temperatures and high temperatures. Background Art

[0002] Instrument cables are cables used to transmit signals or control operations between the control center and various systems. Specifically, the main function of the cables is to connect relays, circuit breakers, pointer instruments and signal lights, switchgear, alarm and interlocking systems, etc.

[0003] Among the cables currently available on the market, there are instrument cables that can work at low temperatures or high temperatures, but there are no instrument cables that are resistant to both low temperatures and high temperatures. Utility Model Content

[0004] In order to make the instrument cable resistant to both low and high temperatures, the present application provides an instrument cable that is resistant to both low and high temperatures.

[0005] The present application provides a low-temperature and high-temperature resistant instrument cable that adopts the following technical solutions:

[0006] A low-temperature and high-temperature resistant instrument cable, comprising:

[0007] The sheath layer is a hollow pipeline structure with two ends open. The sheath layer includes an outer sheath, an armor layer, and an inner sheath arranged in sequence from the outside to the inside. The outer sheath and the inner sheath are both made of halogen-free flame-retardant TPE material.

[0008] A shielding layer, the shielding layer being arranged on the inner side of the inner protective layer;

[0009] a wrapping layer, the wrapping layer being arranged on the inner side of the shielding layer;

[0010] The core wire layer is arranged on the inner side of the sheathing layer, and the core wire layer includes multiple twisted pairs and a grounding conductor. The multiple twisted pairs are evenly arranged along the circumference of the shielding layer.

[0011] By adopting the above technical solution, by arranging three layers of protection on the outermost side of the cable, and using halogen-free flame-retardant TPE material for both the outer sheath and the inner sheath, the instrument cable can be resistant to both low and high temperatures, so that the temperature range of the sheath layer can be -75°C to 105°C. After aging the instrument cable of the present application in an air oven at 136°C for 168 hours, the change rate of tensile strength and elongation is less than 20%, and the brittle temperature can reach -75°C.

[0012] Preferably, each of the twisted pair cables includes two insulated core wires and a multi-core twisted grounding conductor 2, and each of the insulated core wires includes a multi-core twisted core wire conductor and an insulating layer covering the core wire conductor.

[0013] Preferably, the first grounding wire, the second grounding wire and the core conductor are all made of galvanized copper material.

[0014] Preferably, the insulating layer is made of PE material.

[0015] Preferably, the wrapping layer includes a wrapping layer 1 and a wrapping layer 2, the wrapping layer 1 is wrapped around each twisted pair, the wrapping layer 2 is wrapped around the core layer, and multiple twisted pairs and grounding wire 1 are all wrapped inside the wrapping layer 2.

[0016] By adopting the above technical solution, the first coating layer is wrapped around each twisted pair to form a first layer of shielding structure, and the second coating layer is wrapped around the core layer to form a second layer of shielding structure.

[0017] Preferably, the first and second coating layers are both made of aluminum foil Mylar tape.

[0018] By adopting the above technical solution, the double-layer aluminum foil shielding structure enhances the anti-interference ability of the cable.

[0019] Preferably, the shielding layer is made of tinned copper wire braid.

[0020] By adopting the above technical solution, the shielding layer forms a third shielding structure.

[0021] Preferably, the armor layer comprises a plurality of galvanized steel wires, and the plurality of galvanized steel wires are evenly arranged along the circumference of the sheath layer, and two adjacent galvanized steel wires abut against each other.

[0022] By adopting the above technical solution, galvanized steel wire armor is applied outside the inner sheath to protect the cable, thereby improving the structural strength and wear resistance of the cable.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The structure and material of the sheath layer enable the instrument cable to be resistant to both low and high temperatures, and have high flame retardancy, high UV resistance and high oil resistance;

[0025] 2. The three-layer shielding structure gives the instrument cable excellent signal transmission performance, low capacitance and low inductance, which is conducive to signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a low-temperature and high-temperature resistant instrument cable in an embodiment of the present application.

[0027] Explanation of the accompanying symbols: 1. Sheath layer; 11. Outer sheath; 12. Armor layer; 121. Galvanized steel wire; 13. Inner sheath; 2. Shielding layer; 3. Wrapping layer; 31. Coating layer 1; 32. Coating layer 2; 4. Core wire layer; 41. Twisted pair; 411. Insulated core wire; 4111. Core wire conductor; 4112. Insulation layer; 412. Grounding conductor 2; 42. Grounding conductor 1. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 This application is described in further detail.

[0029] The embodiment of the present application discloses an instrument cable that is resistant to both low and high temperatures.

[0030] Reference Figure 1 The low-temperature and high-temperature resistant instrument cable includes a sheath layer 1. The sheath layer 1 is a hollow pipeline structure with openings at both ends. The sheath layer 1 includes an outer sheath 11, an armor layer 12 and an inner sheath 13 arranged in sequence from the outside to the inside. The outer sheath 11 and the inner sheath 13 are both made of halogen-free flame-retardant TPE material.

[0031] By providing three layers of protection on the outermost side of the cable, and using halogen-free flame-retardant TPE material for both the outer sheath 11 and the inner sheath 13, the instrument cable is resistant to both low and high temperatures. The temperature range of the sheath layer 1 can be extended to -75°C to 105°C. After aging the instrument cable in an air oven at 136°C for 168 hours, the change in tensile strength and elongation was less than 20%, and the brittle temperature reached -75°C. The structure and material of the sheath layer 1 make the instrument cable resistant to both low and high temperatures, while also exhibiting high flame retardancy, UV resistance, and oil resistance.

[0032] The armor layer 12 includes multiple galvanized steel wires 121. The diameter of the galvanized steel wires 121 is 0.9±0.03 mm. The multiple galvanized steel wires 121 are evenly arranged along the circumference of the sheath layer 1. Two adjacent galvanized steel wires 121 abut against each other. The galvanized steel wires 121 are armored outside the inner sheath 13 to protect the cable, thereby improving the structural strength and wear resistance of the cable.

[0033] A shielding layer 2 is provided on the inner side of the inner protective layer 13 , and the shielding layer 2 is made of a tinned copper wire braid.

[0034] A wrapping layer 3 is provided inside the shielding layer 2 .

[0035] A core layer 4 is disposed inside the sheath 3. This layer includes five twisted pairs 41 and a grounding conductor 1 42 for conducting noise to the ground. The five twisted pairs 41 are evenly spaced along the circumference of the shield 2. Each twisted pair 41 includes two insulated core wires 411 and a multi-core twisted grounding conductor 2 412. Each insulated core wire 411 includes a multi-core twisted core conductor 4111 and an insulating layer 4112 covering the core conductor 4111.

[0036] The first grounding conductor 42, the second grounding conductor 412, and the core conductor 4111 are all made of galvanized copper, and the insulating layer 4112 is made of PE material with a low dielectric constant.

[0037] The sheathing layer 3 comprises a first sheath 31 and a second sheath 32. Sheath 1 31 is wrapped around each twisted pair 41 to form the primary shielding structure. Sheath 2 32 is wrapped around the core layer 4. The five twisted pairs 41 and grounding conductor 1 42 are wrapped within sheath 2 32 to form the secondary shielding structure. Both sheaths 1 31 and 2 32 are constructed of aluminum foil Mylar tape. This double-layer aluminum foil shielding enhances the cable's anti-interference capabilities.

[0038] The three-layer shielding structure gives the instrument cable excellent signal transmission performance, low capacitance and low inductance, which is conducive to signal transmission.

[0039] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A low-temperature and high-temperature resistant instrument cable, characterized in that: include: A sheath layer (1), the sheath layer (1) is a hollow pipeline structure and is open at both ends. The sheath layer (1) comprises an outer sheath (11), an armor layer (12), and an inner sheath (13) arranged in sequence from the outside to the inside. The outer sheath (11) and the inner sheath (13) are both made of halogen-free flame-retardant TPE material. A shielding layer (2), the shielding layer (2) being arranged on the inner side of the inner protective layer (13); A wrapping layer (3), the wrapping layer (3) being arranged on the inner side of the shielding layer (2); A core wire layer (4), the core wire layer (4) is arranged on the inner side of the wrapping layer (3), the core wire layer (4) includes a plurality of twisted pairs (41) and a grounding conductor (42), and the plurality of twisted pairs (41) are evenly arranged along the circumference of the shielding layer (2).

2. The low-temperature and high-temperature resistant instrument cable according to claim 1, characterized in that: Each twisted pair (41) includes two insulating core wires (411) and a multi-core twisted grounding conductor (412), and each insulating core wire (411) includes a multi-core twisted core wire conductor (4111) and an insulating layer (4112) covering the core wire conductor (4111).

3. The low-temperature and high-temperature resistant instrument cable according to claim 2, characterized in that: The grounding wire 1 (42), the grounding wire 2 (412), and the core conductor (4111) are all made of galvanized copper material.

4. The low-temperature and high-temperature resistant instrument cable according to claim 2, characterized in that: The insulating layer (4112) is made of PE material.

5. The low-temperature and high-temperature resistant instrument cable according to claim 1, characterized in that: The wrapping layer (3) includes a wrapping layer 1 (31) and a wrapping layer 2 (32), wherein the wrapping layer 1 (31) is wrapped around each twisted pair (41), and the wrapping layer 2 (32) is wrapped around the core layer (4), and the plurality of twisted pairs (41) and the grounding conductor 1 (42) are all wrapped inside the wrapping layer 2 (32).

6. The low-temperature and high-temperature resistant instrument cable according to claim 5, characterized in that: The coating layer 1 (31) and the coating layer 2 (32) are both made of aluminum foil Mylar tape.

7. The low-temperature and high-temperature resistant instrument cable according to claim 1, characterized in that: The shielding layer (2) is made of a tinned copper wire braid.

8. The low-temperature and high-temperature resistant instrument cable according to claim 1, characterized in that: The armor layer (12) comprises a plurality of galvanized steel wires (121), the plurality of galvanized steel wires (121) being evenly arranged along the circumference of the sheath layer (1), and two adjacent galvanized steel wires (121) being in contact with each other.

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