High-efficiency cross-linked cable degassing device

Abstract

This utility model discloses a high-efficiency cross-linked cable degassing device, including a degassing and insulation chamber, a hot air source, and a conveying pipeline for delivering hot air from the hot air source into the degassing and insulation chamber. The degassing and insulation chamber is equipped with a bottom air duct, a top air duct, a first central air duct, a second central air duct, and a methane content monitoring device. The bottom and top air ducts are connected and communicate with the conveying pipeline. The first and second central air ducts are respectively connected to the top air duct via flexible air supply hoses, and their positions can change with the position of the air supply hoses, allowing different cable reels to be fitted onto the outside of the central air ducts. Each air duct has an air outlet. This utility model achieves bidirectional, three-dimensional, and synchronous ventilation and heating of the outer and inner surfaces of the cable insulation layer through the top, bottom, and central air ducts, significantly shortening the overall degassing time and ensuring uniform degassing effect across the entire cable reel.

Description

Technical Field

[0001] This utility model relates to a cable degassing device, and more particularly to a high-efficiency cross-linked cable degassing device. Background Technology

[0002] Cross-linked polyethylene (XLPE) cables have become a core material in high-voltage power transmission due to their excellent electrical properties, heat resistance, and mechanical strength. During the production of XLPE cables, the cross-linking reaction inevitably produces low-molecular-weight byproducts, primarily methane (CH4). If these byproducts remain inside the insulation layer, they will lead to increased partial discharge, decreased insulation performance, and even breakdown accidents during operation. Therefore, the degassing process is a crucial step in ensuring the long-term reliability of the cable.

[0003] The degassing technologies commonly used in the industry currently suffer from the following defects: (1) Low efficiency: Traditional natural degassing relies on ambient temperature and takes several weeks or even months, severely restricting the production cycle; while conventional hot air accelerated degassing often adopts a unidirectional external heating mode (such as only introducing hot air to the outside of the cable reel), resulting in uneven heating inside and outside the cable insulation layer, easy discharge of surface by-products and internal accumulation of residues, forming a "degassing blind zone". (2) Insufficient temperature control accuracy: Existing heating devices lack precise control over the internal temperature of the cable reel, and uneven distribution of hot air can easily cause local overheating (damage to the insulation layer) or low temperature dead zone (incomplete degassing), requiring repeated adjustment of process parameters, which significantly increases energy consumption. (3) Ambiguous determination of the degassing endpoint: Most production lines rely on empirical formulas to estimate the degassing time or use intermittent manual sampling to detect methane concentration. This method cannot monitor the dynamics of gas discharge in real time, which can easily lead to insufficient degassing (residual risk) or over-treatment (energy waste), and manual intervention can cause interruption of production continuity. (4) The contradiction between energy consumption and environmental protection is prominent: Increasing the heating temperature to shorten the cycle will greatly increase energy consumption and violate the requirements of green manufacturing; while lowering the temperature will prolong the degassing time and increase the overall cost.

[0004] Although some improved technologies attempt to introduce internal ventilation or temperature monitoring, problems such as insufficient hot air penetration depth and low efficiency of synergistic heating between inner and outer layers still exist. Utility Model Content

[0005] Purpose of the utility model: The purpose of this utility model is to provide a high-efficiency cross-linked cable degassing device that can achieve synchronous and uniform heating of the inner and outer insulation layers of the cable and real-time monitoring of the degassing process.

[0006] Technical Solution: The high-efficiency cross-linked cable degassing device of this utility model includes a degassing and insulation chamber, a hot air source, and a conveying pipeline for delivering hot air from the hot air source into the degassing and insulation chamber. The degassing and insulation chamber is equipped with a bottom air duct, a top air duct, a first central air duct, a second central air duct, and a methane content monitoring device. The bottom and top air ducts are connected and connected to the conveying pipeline. The first and second central air ducts are respectively connected to the top air duct via flexible air supply hoses. One end of the flexible air supply hose connected to the first and second central air ducts is a free end. The positions of the first and second central air ducts can change with the position of the flexible air supply hoses, allowing different cable reels to be respectively fitted onto the outside of the central air ducts. Both the bottom and top air ducts are equipped with air outlets for ventilation and heating from outside the cable reels into the cable coils. Both the first and second central air ducts are equipped with air outlets for ventilation and heating from inside the cable reels into the cable coils. The methane content monitoring device is located at the top of the degassing and insulation chamber for detecting the methane content in the circulating hot air inside.

[0007] The first central air duct and the second central air duct each include several circular pipes; each circular pipe of each central air duct has a first air outlet and a second air outlet distributed on its surface.

[0008] In this system, several circular pipes in each central air duct are fixed together by circular rings at both ends of the pipes.

[0009] Each round pipe is connected to the top air duct via a flexible air supply hose; the flexible air supply hose is a stainless steel metal hose, which allows the first and second central air ducts to be suspended and fixed inside the degassing and insulation chamber.

[0010] In this configuration, the length of each circular pipe in the first and second central air ducts is equal to the axial length of the corresponding cable reel.

[0011] The bottom and top air ducts are both U-shaped pipes with openings facing the outside of the degassing and insulation chamber; the U-shaped pipes of the bottom and top air ducts are connected by vertical pipes; the top air duct has two U-shaped pipes arranged side by side; the bottom and top air ducts are each provided with multiple air outlets at intervals.

[0012] Each circular tube has two symmetrical rows of spaced first air outlet holes and two symmetrical rows of spaced second air outlet holes on its surface, with any two adjacent rows of air outlet holes spaced 90° apart along the surface of the circular tube.

[0013] The inner diameter of the first air outlet and the second air outlet is Φ20~Φ50mm, and the distance between the air outlets is 100~150mm.

[0014] The first and second central air ducts are each composed of four stainless steel round tubes; all the air outlets on the first and second central air ducts form four air outlet directions spaced 90° apart.

[0015] The central axes of the first and second central air ducts are on the same horizontal line.

[0016] The delivery pipeline is equipped with a temperature sensor and an air supply mechanism. The air supply mechanism includes a motor and a fan connected to the motor to blow hot air from the heat source into the delivery pipeline. The motor can control the rotation of the fan and adjust the air speed.

[0017] Beneficial effects: Compared with the prior art, this utility model achieves the following significant effects:

[0018] (1) The cross-linked polyethylene cable degassing device of this utility model realizes bidirectional, three-dimensional and synchronous ventilation and heating of the outer surface and inner surface (reel gap) of the cable insulation layer through the top, bottom and central air ducts, shortens the time required for the inner layer and middle layer of the cable on the cable reel to reach the degassing temperature, thereby greatly shortening the overall degassing time and ensuring that the degassing effect of the whole reel of cable is uniform.

[0019] (2) The temperature sensor can detect the temperature of the hot air in real time, and the methane content monitoring device can detect the real-time methane content in the degassing and insulation chamber, and know the degassing process. This improves the accuracy, objectivity and reliability of the degassing completion judgment, and improves the overall production capacity and efficiency. It is in line with the current industrial green, low-carbon, energy-saving and emission-reduction development trend and requirements. The structure is reasonably designed and the transformation or implementation is relatively easy. It is convenient to upgrade the existing production line or integrate it into the new line. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the bottom air duct, the top air duct, the first central air duct, and the second central air duct;

[0022] Figure 3 This is a schematic diagram of the four stainless steel round pipes in each central air duct. Detailed Implementation

[0023] The present invention will now be described in further detail.

[0024] like Figures 1-3As shown, this embodiment provides a high-efficiency cross-linked polyethylene cable degassing device, including a degassing and insulation chamber 1, a hot air source (not shown in the figure), a conveying pipeline (not shown in the figure), a bottom air duct 2, a top air duct 3, a first central air duct 4, a second central air duct 5, and a methane content monitoring device 6.

[0025] The degassing and insulation chamber 1 is a large, well-sealed space with a frame made of corrosion-resistant materials such as stainless steel or carbon steel, filled with insulation material. The degassing and insulation chamber 1 is connected to a hot air source via a delivery pipeline; the hot air source can be a commonly available device that generates hot air and controls the output temperature. A temperature sensor and an air delivery mechanism are installed within the delivery pipeline; the air delivery mechanism includes a motor and a fan connected to the motor to blow hot air from the hot air source into the delivery pipeline; the motor can adjust the fan speed to regulate the hot air velocity within the delivery pipeline. This fan can be installed at the connection point between the hot air source and the delivery pipeline.

[0026] The bottom of the degassing and insulation chamber 1 is provided with a bottom air duct 2, and the bottom air duct 2 is provided with multiple bottom air outlets 2.1 at intervals. The top of the degassing and insulation chamber 1 is provided with a top air duct 3, and the top air duct 3 is provided with multiple top air outlets 3.1 at intervals. The bottom air duct 2 and the top air duct 3 are connected and connected to the conveying pipeline.

[0027] In this embodiment, both the bottom air duct 2 and the top air duct 3 are U-shaped pipes with openings facing the outside of the degassing and insulation chamber; the U-shaped pipes of the bottom air duct 2 and the top air duct 3 are connected by a vertical pipe; the top air duct 3 has two U-shaped pipes arranged side by side, which are also connected by a vertical pipe; to facilitate viewing the interior of the degassing and insulation chamber 1, Figure 2 The top air duct 3 in the diagram only shows half of the U-shape; the other half is not drawn.

[0028] The degassing and insulation chamber 1 is equipped with a first central air duct 4 and a second central air duct 5, which are connected to the top air duct. The axes of the first central air duct 4 and the second central air duct 5 are parallel, with the first central air duct 4 located closer to the outside of the degassing and insulation chamber 1 and the second central air duct 5 located closer to the inside of the degassing and insulation chamber 1. The first central air duct 4 and the second central air duct 5 are respectively connected to the top air duct 3 via air supply hoses 9, and are respectively fixed inside the degassing and insulation chamber 1 via air supply hoses 9. One end of the air supply hose 9 connected to the first central air duct 4 and the second central air duct 5 is a free end, and the position of this free end is adjustable. The positions of the first central air duct 4 and the second central air duct 5 can be changed according to the position of the air supply hoses, so that different cable reels can be respectively fitted onto the outside of the first central air duct 4 and the second central air duct 5. The high-efficiency cross-linked polyethylene cable degassing device provided in this embodiment can perform degassing work on two cable reels simultaneously.

[0029] Both the first central air duct 4 and the second central air duct 5 include several circular pipes 4.3, which are stainless steel circular pipes; each circular pipe 4.3 in each central air duct has a first air outlet 4.1 and a second air outlet 4.2 distributed on its surface. In this embodiment, each central air duct consists of 4 circular pipes, which are fixed together by rings located at both ends of the 4 circular pipes; each circular pipe is connected to the top air duct through a flexible air supply hose; the flexible air supply hose is a stainless steel metal hose, which allows the first and second central air ducts to be suspended and fixed inside the degassing and insulation chamber.

[0030] Each circular tube 4.3 has two symmetrical rows of spaced first air outlet holes 4.1 and two symmetrical rows of spaced second air outlet holes 4.2 distributed on its surface. Any two adjacent rows of air outlet holes are distributed at 90° intervals along the surface of the circular tube 4.3. Therefore, the first central air duct 4 and the second central air duct 5 form four air outlet directions at 90° intervals, blowing air into the inner walls of the inner cable reel 8 and the outer cable reel 7, forming a two-way ventilation path inside and outside, enhancing heat exchange efficiency, and ensuring that all parts of the inner and outer layers of cables in the inner cable reel 8 and the outer cable reel 7 are heated evenly.

[0031] In this embodiment, the inner diameter of the first air outlet 4.1 and the second air outlet 4.2 are both Φ20~Φ50mm, and the spacing between the air outlets is 100~150mm. The length of each circular tube 4.3 in the first central air duct 4 and the second central air duct 5 is equal to the axial length of the corresponding cable reel 7.

[0032] The top of the degassing and insulation chamber 1 in this embodiment is also equipped with a methane content monitoring device 6 for detecting the methane content in the indoor circulating hot air.

[0033] The method for degassing using the above-mentioned degassing device includes the following steps:

[0034] A. Push the inner cable reel 8 and the outer cable reel 7 into the degassing and insulation chamber 1 respectively, so that the outer cable reel 7 is axially fitted on the outside of the first central air duct 4, and the inner cable reel 8 is axially fitted on the outside of the second central air duct 5; close the degassing and insulation chamber 1.

[0035] B. Turn on the hot air source and blow air into the bottom air duct 2 and top air duct 3 inside the degassing and insulation chamber 1 through the delivery pipeline. The air is also blown into the degassing and insulation chamber 1 through multiple bottom air outlets 2.1 and top air outlets 3.1 that are spaced apart on the bottom air duct 2 and top air duct 3. The motor drives the fan to send the hot air from the hot air source into the delivery pipeline. The temperature sensor detects the temperature of the hot air in the delivery pipeline in real time.

[0036] C. Hot air is blown into the first central air duct 4 and the second central air duct 5 through the air supply hoses connected to the bottom air duct 2 and the top air duct 3, and blown into the inner wall of the inner cable reel 8 and the outer cable reel 7 from the four air outlet directions of the first central air duct 4 and the second central air duct 5 at 90° intervals. This forms a two-way ventilation path, which enhances the heat exchange efficiency and ensures that all parts of the inner and outer cables in the inner cable reel 8 and the outer cable reel 7 are heated evenly.

[0037] D. The circulating hot air in the degassing and insulation chamber 1 is monitored and recorded in real time by the methane content monitoring device 6 at the top of the degassing and insulation chamber 1. Every 8 hours, the circulating hot air in the degassing and insulation chamber 1 is discharged to the outside after passing through the methane content monitoring device 6, and each discharge time is 5 minutes.

[0038] This utility model discloses a cross-linked polyethylene cable degassing device, which achieves three-dimensional ventilation and heating of the cable insulation layer through top, bottom, and central air ducts, shortening the degassing time and ensuring uniform degassing effect. Furthermore, a temperature sensor can detect the temperature of the incoming hot air in real time, and a methane content monitoring device can detect the real-time methane content within the degassing chamber 1, thus providing information on the degassing progress.

Claims

1. A high-efficiency cross-linked cable degassing device, characterized in that, The system includes a degassing and insulation chamber (1), a hot air source, and a delivery pipeline for delivering hot air from the hot air source into the degassing and insulation chamber. The degassing and insulation chamber is equipped with a bottom air duct (2), a top air duct (3), a first central air duct (4), a second central air duct (5), and a methane content monitoring device (6). The bottom air duct (2) and the top air duct (3) are connected and connected to the delivery pipeline. The first central air duct (4) and the second central air duct (5) are respectively connected to the top air duct (3) via air supply hoses (9). The air supply hoses (9) are connected to the first central air duct (4) and the second central air duct (5) via a... The end is a free end. The positions of the first central air duct (4) and the second central air duct (5) can change with the position of the air supply hose, so that different cable reels can be respectively fitted on the outside of the central air duct; the bottom air duct (2) and the top air duct (3) are both provided with air outlets for ventilation and heating from the outside of the cable reel to the inside of the cable reel; the first central air duct (4) and the second central air duct (5) are both provided with air outlets for ventilation and heating from the inside of the cable reel to the cable reel; the methane content monitoring device (6) is located on the top of the degassing and insulation chamber (1) for detecting the methane content in the indoor circulating hot air.

2. The high-efficiency cross-linked cable degassing device according to claim 1, characterized in that, The first central air duct (4) and the second central air duct (5) each include several round pipes (4.3); each round pipe (4.3) of each central air duct has a first air outlet (4.1) and a second air outlet (4.2) distributed on its surface.

3. The high-efficiency cross-linked cable degassing device according to claim 2, characterized in that, Several circular pipes in each central air duct are fixed together by circular rings at both ends of the pipes.

4. The high-efficiency cross-linked cable degassing device according to claim 2, characterized in that, Both the bottom air duct (2) and the top air duct (3) are U-shaped pipes with openings facing the outside of the degassing and insulation chamber; the U-shaped pipes of the bottom air duct (2) and the top air duct (3) are connected by vertical pipes; the top air duct has two U-shaped pipes arranged side by side; the bottom air duct (2) and the top air duct (3) are provided with multiple air outlets at intervals.

5. The high-efficiency cross-linked cable degassing device according to claim 2, characterized in that, Each circular tube (4.3) has two symmetrical rows of spaced first air outlet holes (4.1) and two symmetrical rows of spaced second air outlet holes (4.2) distributed on its surface, with any two adjacent rows of air outlet holes spaced at 90° intervals along the surface of the circular tube (4.3).

6. The high-efficiency cross-linked cable degassing device according to claim 2, characterized in that, The inner diameter of the first air outlet (4.1) and the second air outlet (4.2) is Φ20~Φ50mm, and the distance between the air outlets is 100~150mm.

7. The high-efficiency cross-linked cable degassing device according to claim 1, characterized in that, The first central air duct (4) and the second central air duct (5) are both composed of 4 stainless steel round pipes (4.3); all the air outlets on the first central air duct (4) and the second central air duct (5) form 4 air outlet directions with a 90° interval; each round pipe is connected to the top air duct through a flexible air supply hose.

8. The high-efficiency cross-linked cable degassing device according to claim 1, characterized in that, The delivery pipeline is equipped with a temperature sensor and an air supply mechanism; the air supply mechanism includes a motor and a fan connected to the motor to blow hot air from the heat source into the delivery pipeline.

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