An electric heating cable for pipelines

Abstract

The present invention relates to the technical field of electric heating tapes, and specifically to an electric heating tape for pipelines, which includes a conductor, an inner sheath, a shielding cover and an outer sheath. When the outer sheath is spirally wound around the outside of the pipeline, the inner sheath is deformed, the first side wall of the inner sheath stretches in the wrinkle direction, the second side wall of the inner sheath bends perpendicular to the wrinkle direction, and the second side wall of the inner sheath stretches in the wrinkle direction. At this time, the contour of the accommodating cavity is deformed. Since multiple temperature-sensing particles are in a state of mutual abutment in the accommodating cavity, when the contour of the accommodating cavity changes, the arrangement form of the multiple temperature-sensing particles in the accommodating cavity changes, and the multiple temperature-sensing particles remain in a state of mutual abutment, preventing the distance between two adjacent temperature-sensing particles from changing, thereby improving the accuracy of the electric heating tape in maintaining the pipeline temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heating tapes, and in particular to an electric heating tape for pipelines. Background Art

[0002] Electric heating tape is a key electric heating element that converts electrical energy into thermal energy. Electric heating tape can provide heating, insulation and antifreeze effects for pipelines. Electric heating tape is widely used in pipeline systems in industries such as industry, construction, agriculture, and water treatment.

[0003] Prior art, such as Chinese patent application publication number CN113630918A, discloses a self-limiting temperature heating tape. The document describes two sets of conductors, each wrapped in a self-controlling conductive layer, which in turn is provided with an insulating layer and a shielding layer. The self-controlling conductive layer can change the connectivity between the two sets of conductors based on the ambient temperature. Specifically, the layer contains carbon granules of conductive plastic. When the ambient temperature drops, the layer contracts, causing the carbon granules to connect and form a circuit. This circuit generates heat when current flows through it. Once the temperature rises, the layer expands, disconnecting the carbon granules and causing the power output to decrease. This cycle repeats, precisely adapting to ambient temperature changes.

[0004] However, in actual usage scenarios, when the self-limiting temperature electric heating tape is tightly fitted to the pipe surface in a spiral winding manner, due to the different shapes of the pipes and the numerous bending positions of the electric heating tape, the electric heating tape will be subjected to uneven force at the bending parts, with the outside being stretched and the inside being compressed. As a result, under a constant temperature environment, the number of circuits of the carbon particle conductive plastic at different positions is different. This situation directly weakens the accuracy of temperature control and cannot accurately maintain the required temperature of the pipeline. Summary of the Invention

[0005] The present invention provides an electric heating tape for pipelines to solve the problem that existing electric heating tapes cannot accurately maintain the temperature of pipelines.

[0006] The electric heating tape for pipelines of the present invention adopts the following technical solutions:

[0007] An electric heating cable for pipelines comprises a conductor, an inner sheath, a shielding cover and an outer sheath.

[0008] Two conductors are provided, one of which is connected to the positive pole of the power supply, and the other is connected to the negative pole of the power supply, and the two conductors are arranged at intervals; the inner sheath has a accommodating cavity inside, and the accommodating cavity has a support frame, and the support frame is used to support the two conductors; the inner sheath has a corrugated first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are opposite side walls, and the third side wall and the fourth side wall are opposite side walls; wherein the corrugation direction of the first side wall, the third side wall and the fourth side wall is the same, and the corrugation direction of the second side wall is perpendicular to the corrugation direction of the first side wall; the second side wall is close to the side wall of the pipe; the accommodating cavity is filled with a plurality of temperature-sensitive particles; the shielding cover is arranged on the outside of the inner sheath, and the shielding cover is used to reduce the interference of electromagnetic radiation in the external environment on the conductor; the outer sheath is arranged on the outside of the shielding cover, and the outer sheath is used to protect the internal shielding cover, the inner sheath and the conductor.

[0009] Furthermore, the temperature-sensitive particles include carbon particles and a shell, the shell is a plastic shell, the carbon particles are arranged inside the shell, the shell can expand and contract with heat, and the multiple temperature-sensitive particles in the accommodating cavity abut against each other.

[0010] Furthermore, a sealing plug is provided at the end of the inner sheath, and the sealing plug can keep the accommodating cavity in a relatively closed state; during the production process, a filler is filled into the accommodating cavity, and the filler is used to fill the gap between two adjacent temperature-sensing particles.

[0011] Furthermore, the insulation performance of the filler is the same as the insulation performance of the shell.

[0012] Furthermore, the seam filler is made of liquid material.

[0013] Furthermore, the conductor is in the shape of a rectangular plate. Initially, the two conductors are arranged parallel to each other. The conductor has two first surfaces and two second surfaces in the length direction. The area of the first surface is larger than the area of the second surface. The first surfaces of the two conductors are arranged opposite to each other.

[0014] Furthermore, the longitudinal sections of the shielding cover and the outer sheath are both slightly trapezoidal, and the shielding cover and the outer sheath are both capable of deformation.

[0015] Furthermore, the support frame is a plurality of support grooves, and the plurality of support grooves are distributed on the third side wall and the fourth side wall inside the inner sheath, and the conductor can move relative to the support grooves.

[0016] Furthermore, the shielding cover is a mesh structure woven from aluminum-magnesium alloy wires.

[0017] Furthermore, the outer sheath is made of modified polyolefin.

[0018] The beneficial effects of the present invention are as follows: an electric heating tape for a pipeline of the present invention comprises a conductor, an inner sheath, a shielding cover and an outer sheath; when the electric heating tape is spirally wound on the pipeline, the outer sheath is in direct contact with the pipeline; by filling a plurality of temperature-sensitive particles inside the inner sheath, the plurality of temperature-sensitive particles are in a state of mutual abutment; and the side walls of the inner sheath are all arranged in a corrugated shape, wherein the corrugation directions of the first side wall, the third side wall and the fourth side wall are the same, the corrugation direction of the second side wall is perpendicular to the corrugation direction of the first side wall, and the second side wall is close to the side wall of the pipeline; when the outer sheath is spirally wound on the outside of the pipeline, The inner sheath is deformed, the first side wall of the inner sheath stretches in the direction of the wrinkles, the second side wall of the inner sheath bends perpendicular to the direction of the wrinkles, and the second side wall of the inner sheath stretches in the direction of the wrinkles. At this time, the contour of the accommodating cavity is deformed. Since the multiple temperature-sensing particles are in a state of mutual abutment in the accommodating cavity, when the contour of the accommodating cavity changes, the arrangement of the multiple temperature-sensing particles in the accommodating cavity changes, and the multiple temperature-sensing particles remain in a state of mutual abutment to prevent the distance between two adjacent temperature-sensing particles from changing, thereby improving the accuracy of the electric heating tape in maintaining the pipeline temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of an electric heating cable for pipelines provided in an embodiment of the present invention;

[0021] Figure 2 An exploded diagram of the structure of an electric heating cable for pipelines provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of the interior of an inner sheath in an electric heating cable for pipelines provided in an embodiment of the present invention;

[0023] Figure 4 A schematic structural diagram of an inner sheath in an electric heating cable for pipelines provided in an embodiment of the present invention;

[0024] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0025] In the figure: 110, conductor; 120, inner sheath; 121, first side wall; 122, second side wall; 123, third side wall; 124, fourth side wall; 130, accommodating cavity; 140, shielding cover; 150, outer sheath; 160, temperature-sensing particles; 170, supporting groove. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like, indicating positions or relationships, are based on those shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or element referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention.

[0028] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0029] like Figures 1 to 5 As shown, an embodiment of the present invention provides an electric heating cable for pipelines, which includes a conductor 110, an inner sheath 120, a shielding cover 140 and an outer sheath 150.

[0030] The conductor 110 is made of copper. There are two conductors 110 , one of which is connected to the positive pole of the power supply, and the other is connected to the negative pole of the power supply. The two conductors 110 are spaced apart to prevent a short circuit between the two conductors 110 .

[0031] The inner sheath 120 is hollow, and the hollow chamber within the inner sheath 120 serves as a receiving chamber 130. A support frame is provided within the receiving chamber 130, which is used to support the two conductors 110. In this embodiment, the support frame includes two support seats, which are spaced apart within the receiving chamber 130, each supporting a conductor 110. When the two conductors 110 are supported and the inner sheath 120 is horizontal, the two conductors 110 are located in the same horizontal plane. The inner sheath 120 has a corrugated first sidewall 121, a second sidewall 122, a third sidewall 123, and a fourth sidewall 124. The inner sheath 120 has a roughly rectangular parallelepiped profile, with the first sidewall 121 and the second sidewall 122 being opposite sidewalls, and the third sidewall 123 and the fourth sidewall 124 being opposite sidewalls. The first and second side walls 121 and 122 have the same area, and the third and fourth side walls 123 and 124 have the same area. The area of the first side wall 121 is greater than that of the third side wall 123. Furthermore, the first, third, and fourth side walls 121, 123, and 124 have the same folding direction, with the folding direction of the first side wall 121 being along its length. For ease of understanding, the first, third, and fourth side walls 121, 123, and 124 are capable of extending in their lengthwise directions. The folding direction of the second side wall 122 is perpendicular to the folding direction of the first side wall 121. For ease of understanding, the folding direction of the second side wall 122 is along its widthwise direction. When the inner sheath 120 is positioned against a pipe, the second side wall 122 is positioned against the pipe's sidewall, while the third and fourth side walls 123 and 124 are perpendicular to the pipe's sidewall. The accommodating cavity 130 is filled with a plurality of temperature-sensitive particles 160. The temperature-sensitive particles 160 are in direct contact with the two conductors 110, and the plurality of temperature-sensitive particles 160 can form a circuit between the two conductors 110. When the external environment is at a low temperature, the volume of the plurality of temperature-sensitive particles 160 is at a minimum. At this time, the number of circuits formed between the temperature-sensitive particles 160 is at a maximum. After the two conductors 110 are connected to a power source, the circuit formed between the temperature-sensitive particles 160 can flow current, thereby generating heat. When the temperature rises, the volume of the temperature-sensitive particles 160 increases, and the number of circuits formed between the temperature-sensitive particles 160 gradually decreases, thereby reducing the heat generated by the temperature-sensitive particles 160.

[0032] The shielding cover 140 is sleeved on the outer side of the inner sheath 120 . The shielding cover 140 is used to reduce the interference of electromagnetic radiation in the external environment on the conductor 110 . By providing the shielding cover 140 , the stability of the conductor 110 during operation is improved.

[0033] The outer sheath 150 is sleeved on the outside of the shielding cover 140. The outer sheath 150 is used to protect the internal shielding cover 140, the inner sheath 120 and the conductor 110. The outer sheath 150 can directly contact the external environment. The outer sheath 150 can prevent the shielding cover 140, the inner sheath 120 and the conductor 110 from being corroded by substances in the external environment. When heating the pipeline, the two conductors 110 are connected to the power supply at the same time, and the outer sheath 150 is spirally wrapped around the outside of the pipeline. At this time, the outer sheath 150 is deformed, and the outer sheath 150 simultaneously drives the inner sheath 120 to deform, the second side wall 122 stretches in the wrinkle direction, the second side wall 122 bends perpendicular to the wrinkle direction, and the first side wall 121 stretches in the wrinkle direction, causing the contour of the accommodating cavity 130 inside the inner sheath 120 to deform, and the arrangement of the multiple temperature-sensing particles 160 in the accommodating cavity 130 changes, but the volume of the multiple temperature-sensing particles 160 remains unchanged, and the gap between two adjacent temperature-sensing particles 160 remains unchanged, preventing the gap between the multiple temperature-sensing particles 160 from changing when the outer sheath 150 is wrapped around the pipeline.

[0034] The present invention relates to an electric heating tape for a pipeline. When the electric heating tape is spirally wound on the pipeline, the outer sheath 150 is in direct contact with the pipeline. By filling a plurality of temperature-sensitive particles 160 inside the inner sheath 120, the plurality of temperature-sensitive particles 160 are in a state of abutting each other, and the side walls of the inner sheath 120 are all set to be wrinkled, wherein the wrinkling directions of the first side wall 121, the third side wall 123 and the fourth side wall 124 are the same, the wrinkling direction of the second side wall 122 is perpendicular to the wrinkling direction of the first side wall 121, and the second side wall 122 is close to the side wall of the pipeline. When the outer sheath 150 is spirally wound on the outside of the pipeline, the inner sheath 120 is deformed, and the inner sheath 120 is wrinkled. The first side wall 121 stretches in the direction of the wrinkles, and the second side wall 122 of the inner sheath 120 bends perpendicular to the direction of the wrinkles, and the second side wall 122 of the inner sheath 120 stretches in the direction of the wrinkles. At this time, the outline of the accommodating cavity 130 is deformed. Since the multiple temperature-sensing particles 160 are in a state of mutual abutment in the accommodating cavity 130, when the outline of the accommodating cavity 130 changes, the arrangement of the multiple temperature-sensing particles 160 in the accommodating cavity 130 changes, and the multiple temperature-sensing particles 160 remain in a state of mutual abutment to prevent the distance between two adjacent temperature-sensing particles 160 from changing, thereby improving the accuracy of the electric heating tape in maintaining the pipeline temperature.

[0035] In one embodiment, the temperature-sensing particles 160 include carbon particles and a shell. The shell is a plastic shell with a certain degree of insulation. The carbon particles are arranged inside the shell. Current can pass between two adjacent temperature-sensing particles 160. The shell can expand and contract with heat. The multiple temperature-sensing particles 160 in the accommodating cavity 130 abut against each other. When the external environment is at a low temperature, the gap between the two adjacent temperature-sensing particles 160 is at its minimum. At this time, the carbon particles inside the two adjacent temperature-sensing particles 160 can form a circuit and generate heat when current flows through the circuit. As the temperature of the accommodating cavity 130 rises, the shell begins to expand under the action of thermal expansion and contraction. The number of circuits formed between the two adjacent temperature-sensing particles 160 and the carbon particles decreases, thereby reducing the power of heat generation.

[0036] In one embodiment, a sealing plug is provided at the end of the inner sheath 120. Specifically, the sealing plug can seal the opening at the end of the accommodating cavity 130. The sealing plug makes the accommodating cavity 130 in a relatively closed state, and the sealing plug can prevent the temperature-sensing particles 160 from escaping from the accommodating cavity 130. During the production of the electric heating tape, a filler is filled into the accommodating cavity 130. The filler is used to fill the gap between two adjacent temperature-sensing particles 160. Since each temperature-sensing particle 160 is an independent particle, in order to fill the gap between two adjacent temperature-sensing particles 160, the filler is filled into the accommodating cavity 130. The filler can be solid or liquid. When the filler is solid, the particle size of the filler is much smaller than the particle size of the temperature-sensing particles 160, ensuring that the filler can be smoothly filled between two adjacent temperature-sensing particles 160; when the filler is liquid, the filler can flow between two adjacent temperature-sensing particles 160.

[0037] In one embodiment, the insulation performance of the filler is the same as that of the outer shell. When a circuit is formed between the temperature-sensing particles 160, the filler does not obstruct the circuit. The filler is made of a liquid material, such as mineral oil, to ensure that the insulation performance of the filler is the same as that of the outer shell. The filler can also be made of a solid material, the filler being made of the same material as the outer shell of the temperature-sensing particles 160, and the filler having a particle size much smaller than the outer diameter of the temperature-sensing particles 160.

[0038] In one embodiment, the conductor 110 is in the shape of a rectangular plate. Initially, the two conductors 110 are arranged parallel to each other. The conductors 110 have two first surfaces and two second surfaces in the length direction. In the same conductor 110, the area of the first surface is greater than the area of the second surface. The first surfaces of the two conductors 110 are arranged relative to each other. When the outer sheath 150 is wrapped around the pipe, the two conductors 110 change from a state of being parallel to each other to a state of having an angle, thereby causing the second side wall 122 of the inner sheath 120 to stretch in the direction of the fold, thereby ensuring that the side wall of the outer sheath 150 can fit on the pipe.

[0039] In one embodiment, the longitudinal cross-sections of the shielding cover 140 and the outer sheath 150 are slightly trapezoidal, and the shielding cover 140 and the outer sheath 150 can both be deformed. When the outer sheath 150 is wrapped around the pipe, the two conductors 110 change from a state of being parallel to each other to a state of having an angle therebetween. When the two conductors 110 change to a state of having an angle therebetween, the two conductors 110 squeeze the inner sheath 120. When the inner sheath 120 is deformed, the shapes of the shielding cover 140 and the outer sheath 150 can provide space for the inner sheath 120 to deform, thereby preventing the shielding cover 140 and the outer sheath 150 from obstructing the inner sheath 120 during the deformation process.

[0040] In one embodiment, the support frame is a plurality of support grooves 170, and the plurality of support grooves 170 are distributed on the third side wall 123 and the fourth side wall 124 inside the inner sheath 120. The conductor 110 can move relative to the support grooves 170. When the outer sheath 150 is spirally wound on the pipe, the inner sheath 120 is deformed, and the plurality of support grooves 170 inside the inner sheath 120 move relative to the conductor 110 to prevent the conductor 110 from being disconnected from the power supply.

[0041] In one embodiment, the shielding cover 140 is a mesh structure woven from aluminum-magnesium alloy wires.

[0042] In one embodiment, the outer sheath 150 is made of modified polyolefin.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric heating cable for pipelines, characterized in that: include: Conductors, wherein two conductors are provided, one of the conductors is connected to the positive pole of the power supply, the other conductor is connected to the negative pole of the power supply, and the two conductors are spaced apart; An inner sheath, wherein the inner sheath has an accommodating cavity inside, and the accommodating cavity has a support frame, and the support frame is used to support the two conductors; the inner sheath has a corrugated first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are opposite side walls, and the third side wall and the fourth side wall are opposite side walls; wherein the corrugation directions of the first side wall, the third side wall and the fourth side wall are the same and can be extended in their own length direction, the corrugation direction of the second side wall is perpendicular to the corrugation direction of the first side wall and can be extended in its own width direction; the second side wall is the side wall close to the pipe; the accommodating cavity is filled with a plurality of temperature-sensitive particles abutting each other, the temperature-sensitive particles include an outer shell and carbon particles arranged inside the outer shell, and the outer shell is a plastic shell that can expand and contract with heat; A shielding cover is sleeved on the outer side of the inner sheath, and is used to reduce the interference of electromagnetic radiation in the external environment on the conductor; The outer sheath is arranged on the outside of the shielding cover, and the outer sheath is used to protect the internal shielding cover, the inner sheath and the conductor; when the outer sheath is spirally wrapped around the outside of the pipe, the first side wall and the second side wall respectively stretch in their own folding directions, and the gap between adjacent temperature-sensing particles remains unchanged.

2. The electric heating cable for pipeline according to claim 1, characterized in that: A sealing plug is provided at the end of the inner sheath, and the sealing plug can keep the accommodating cavity in a relatively closed state; during the production process, a filler is filled into the accommodating cavity, and the filler is used to fill the gap between two adjacent temperature-sensitive particles.

3. The electric heating cable for pipeline according to claim 2, characterized in that: The insulation performance of the filler is the same as that of the shell.

4. The electric heating cable for pipeline according to claim 3, characterized in that: The seam-filling material is made of liquid material.

5. The electric heating cable for pipeline according to claim 1, characterized in that: The conductor is in the shape of a rectangular plate. Initially, the two conductors are arranged parallel to each other. The conductor has two first surfaces and two second surfaces in the length direction. The area of the first surface is larger than the area of the second surface. The first surfaces of the two conductors are arranged opposite to each other.

6. The electric heating cable for pipeline according to claim 5, characterized in that: The longitudinal sections of the shielding cover and the outer sheath are both slightly trapezoidal, and the shielding cover and the outer sheath are both capable of deformation.

7. The electric heating cable for pipeline according to claim 1, characterized in that: The support frame is a plurality of support grooves, and the plurality of support grooves are distributed on the third side wall and the fourth side wall inside the inner sheath, and the conductor can move relative to the support grooves.

8. The electric heating tape for pipeline according to claim 1, characterized in that: The shielding cover is a mesh structure woven from aluminum-magnesium alloy wires.

9. The electric heating cable for pipeline according to claim 1, characterized in that: The outer sheath is made of modified polyolefin.

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