Power cable end sealing device

Abstract

The utility model discloses a power cable end portion sealing device, belonging to the cable outer sheath end portion sealing technology field, the power cable end portion sealing device comprises a heating device and a temperature control device, the heating device comprises a cabin body, the cabin body is internally provided with the heating device, the heating device comprises a heater, and the temperature control device is arranged in the cabin body. The heater comprises a heat conducting plate, and a heating rod and a temperature probe are arranged in the heat conducting plate; the temperature control device is connected with the temperature probe and the heating device and used for controlling the heating temperature of the sealing device. The defects of an existing sealing device and the temperature control problem are solved, and the sealing thermal shrinkage temperature can be accurately controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable outer sheath end sealing, and in particular relates to a power cable end sealing device. Background Art

[0002] Power cables are stored in open air before and during construction. High and low temperatures will cause the cable to expand and contract, resulting in gaps between the insulation layers. In high humidity weather, moisture will penetrate the cable ends. Water condensation will appear on the damp cable parts, some will be relatively damp, and some will have continuous water droplets. After the cable enters the water, water tree aging will occur under the action of the electric field, and finally the cable will be punctured. The local high electric field area formed by the impurities, pores and uneven bonding surfaces of the inner and outer semi-conductive layers of the insulation in the insulation is the starting point for the occurrence of water trees. The development of water trees is a continuous and long process. Affected by the environment, the higher the humidity, temperature and voltage, the more active the ions in the water are, and the faster the ions in the water move, the faster the water trees develop. This affects the service life of the cable, damages or punctures the cable insulation, and brings potential hidden dangers to the operation of the cable.

[0003] Therefore, to prevent water vapor from entering the ends of power cables, the ends of power cables must be sealed to prevent moisture from entering, whether they are stacked or laid. The existing moisture-proof measures for sealing the ends of power cables mainly use a blowtorch to bake the heat shrink cap to seal the ends of the power cables. However, baking the end cap with a blowtorch requires the use of open flames, which poses a great safety hazard. Therefore, it is necessary to propose a power cable end sealing device to achieve the sealing of the cable ends without using open flames. Summary of the invention

[0004] The utility model provides a power cable end sealing device, which can realize the power cable end sealing without using open flame.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A power cable end sealing device comprises a cabin, wherein a plurality of uniformly arranged heating rods are arranged on the inner wall of the cabin, a shell is arranged outside the cabin, and a heat insulation layer is provided between the cabin and the shell.

[0007] Furthermore, a limiter for limiting the height of the end of the power cable is installed at one end of the cabin.

[0008] Furthermore, the limiter is slidably connected to the cabin.

[0009] Furthermore, the limiter includes a limit plate, a slide groove is formed on the limit plate, a mounting column is fixed to the front end of the cabin, a threaded hole is formed in the mounting column, and a fastener passes through the slide groove and is threadedly connected to the mounting column; when the height of the limit plate needs to be adjusted, the fastener is loosened and the limit plate is moved up and down. When the position of the limit plate is determined, the fastener is tightened.

[0010] Furthermore, the upper end surface of the limiting plate is arc-shaped.

[0011] Furthermore, a temperature probe is installed on the cabin.

[0012] Furthermore, the heating rod and the temperature controller are electrically connected.

[0013] Furthermore, a handle is fixed on the shell.

[0014] Furthermore, a handle is fixed on the shell.

[0015] Compared with the prior art, the utility model has at least the following beneficial technical effects:

[0016] The utility model provides a power cable end sealing device, comprising a cabin body, in which a heating device is arranged, and the cable end is heated by the heating device to achieve sealing of the cable end, and the cable end can be sealed without using open flames, thus avoiding potential safety hazards caused by open flames.

[0017] Furthermore, a limiter for limiting the height of the end of the power cable is installed at one end of the cabin, which can limit the height of the cable inserted into the cabin to prevent the cable end from shaking during the heating process.

[0018] Furthermore, the limiter is slidably connected to the cabin body, so that the position of the limiter can be adjusted to accommodate cables of different wire diameters.

[0019] Furthermore, the upper end surface of the limiting plate is arc-shaped, which is adapted to the shape of the cable.

[0020] Furthermore, a temperature probe is installed on the cabin, and the temperature probe can monitor the temperature inside the cabin in real time.

[0021] Furthermore, the heating rod and the temperature controller are electrically connected, and the temperature control device controls the heating temperature of the heating device according to the real-time temperature control to control the heating temperature within an appropriate range, thereby avoiding the safety hazard of poor sealing and failure to achieve a protective effect due to a heating temperature that is too low, or the safety hazard of high temperature damaging the main insulation or semi-conductive layer of the cable due to a heating temperature that is too high.

[0022] Furthermore, a handle is fixed on the shell to facilitate movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1A cross-sectional view of a power cable end sealing device provided in Example 1;

[0024] Figure 2 A front view of a power cable end sealing device provided in Example 1;

[0025] Figure 3 A schematic diagram of a limiter provided in Example 1;

[0026] Figure 4 is a schematic structural diagram of a power cable end sealing device provided in Example 2;

[0027] Figure 5 yes Figure 4 AA section view;

[0028] Figure 6 The appearance of a power cable end sealing device provided in Example 2 is Figure 1 ;

[0029] Figure 7 The appearance of a power cable end sealing device provided in Example 2 is Figure 2 .

[0030] In the figure, 1. cable tube; 2. air outlet; 3. limiter; 4. heating rod; 5. handle; 6. cabin; 7. shell; 8. thermocouple; 9. fan; 10. air inlet; 11. handle; 12. power plug; 13. mounting column; 14. insulation layer; 15. storage compartment; 31. limit plate; 32. first slide slot; 33. second slide slot; 34. third slide slot; 35. first fastener; 36. second fastener; 37. knob. DETAILED DESCRIPTION

[0031] In order to make the purpose and technical solution of the utility model clearer and easier to understand, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0032] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example 1

[0034] Reference Figure 1 to Figure 2 , a power cable end sealing device, including a cabin 6, a shell 7, a heating device and a temperature controller.

[0035] The cabin 6 is cylindrical in shape, and has a cavity for accommodating cables. The cabin 6 is located in the shell 7. A heating device is provided on the inner wall of the cabin 6. A heat insulation layer 14 is provided between the cabin 6 and the shell 7. The material of the heat insulation layer 14 is heat insulation cotton. The heating device is electrically connected to a temperature controller, and the temperature controller is used to control the heating temperature of the heating device. The use of the temperature controller is a common technical means in the art, which will not be described here.

[0036] A storage compartment 15 is fixedly connected to the rear of the cabin body 6 , and a power supply aviation socket 12 is arranged at the rear end of the storage compartment 15 .

[0037] Preferably, the heating device comprises a plurality of heating rods 4 evenly arranged circumferentially, so as to ensure that the cable end is heated evenly during the sealing process, thereby ensuring the sealing quality.

[0038] Preferably, a handle 5 is fixed to the upper portion of the housing 7, a handle 11 is fixed to each of the two sides, and a power supply aviation socket 12 for connecting to a power source is provided at the rear end.

[0039] Preferably, a temperature probe is provided on the inner wall of the cabin 6, and the heating rod is connected with a high temperature resistant cable extending out of the heat conducting plate; the temperature probe is used to measure the current heating temperature.

[0040] The temperature probe returns the temperature signal to the temperature controller to form a temperature feedback loop to achieve accurate temperature control. In this embodiment, the temperature probe is a thermocouple 8.

[0041] Preferably, a limiter 3 is installed at the front end of the cabin 6.

[0042] Reference Figure 3 The limiter 3 includes a limit plate 31, the upper end surface of the limit plate 31 is arc-shaped, and the limit plate 31 is provided with a first slide groove 32, a second slide groove 33, and a third slide groove 34, wherein the first slide groove 32 and the second slide groove 33 are symmetrically arranged about the central axis of the limit plate 31; three mounting columns 13 are fixed to the front end of the cabin 6, and the three mounting columns 13 are arranged circumferentially at intervals of 90 degrees, wherein two mounting columns 13 are symmetrically arranged about the central axis of the cabin 6, and the other mounting column 13 is located below the central axis of the cabin 6. A threaded hole is provided in the mounting column 13, and a first fastener 35 passes through the first slide groove 32 and is inserted into one of the mounting columns 13; a second fastener 36 passes through the second slide groove 33 and is inserted into the second mounting column 13, and a knob 37 passes through the third slide groove 34 and is inserted into the third mounting column 13, and is threadedly connected to the third mounting column 13, and an external thread is provided on the knob 37. In the initial state, the limit plate 31 can slide up and down to adjust the height of the limit plate 31, and then adjust the height of the cable inserted into the cabin 6. After the height is determined, the knob 37 is tightened to fix the position of the limit plate 31.

[0043] The method of using the sealing device provided in this embodiment is as follows:

[0044] The outer sheath of the cable to be sealed needs to be made of environmentally friendly PVC material. The specific operation method includes the following steps:

[0045] Step 1: Clean up the debris left on the surface of the cable outer sheath after inspection to avoid sharp particles, hair, silk and other debris on the surface of the cable outer sheath;

[0046] Step 2: Put the cable heat shrink cap onto the outer sheath of the cable; when heated, the cable head heat shrink cap shrinks, and at the same time, the glue in the heat shrink cap melts and is tightly bonded to the surface of the cable;

[0047] Step 3, insert the power cable covered with the cable heat shrink cap into the cabin 6, so that the lower part of the power cable contacts the upper end surface of the stopper 3;

[0048] Step 4: Turn on the power switch, connect the power of the temperature control device, and use the heating device to heat so that the heat conducting plate and the cable end are heated quickly;

[0049] Step 5: After sealing and heating for 30-45 seconds, the heat shrink cap is completely shrunk and fits tightly with the cable end, the cable is taken out, and the heating device is turned off. Specifically, different heating times are selected according to different cables.

[0050] Step 6: Allow the cable end to cool naturally to room temperature to complete the sealing.

[0051] Example 2

[0052] Reference Figures 4 to 7 , a power cable end sealing device, comprising a cable tube 1, a stopper 3, a cabin 6, a shell 7, a heating device, a thermocouple 8 and a storage compartment 15. The cable tube 1 is made of stainless steel and is a hollow structure for passing through a power cable; the end of the cable is covered with a cable heat shrink cap, and the cable end is coated with a high-performance hot melt adhesive. The cabin 6 is cylindrical, one end of the cable tube 1 is inserted into the cabin 6, the cabin 6 is covered with a shell 7, the rear of the shell 7 is fixedly connected with a storage compartment 15, the cabin 6 is arranged in the shell 7, and the inner wall of the cabin 6 is provided with a heating device. A handle 5 is fixed on the upper part of the shell 7, and a handle 11 is fixed on both sides. A power supply aviation plug 12 is arranged at the rear end of the storage compartment 15, and an air inlet 10 is opened at the rear end of the storage compartment 15. There is a ventilation layer between the outer side and the layer of the cabin 6, one end of the ventilation layer is connected to the air outlet 2, and the other end is connected to the air inlet 10. The air outlet 2 is located at the front side of the cabin 6. A stopper 3 for limiting the insertion height of the cable is fixed at the front end of the cabin 6, so that the axis of the heated cable end and the axis of the cabin 6 coincide as much as possible, so that the cable end can be heated evenly.

[0053] A fan 9 is provided in the storage compartment 15. After the heating device is powered on, the fan 9 is started to achieve uniform and rapid heating inside the compartment.

[0054] Optionally, the limiter 3 is a clamp-type structure consisting of two upper and lower semicircular rings, the inner diameter of the semicircular ring is 3 cm and the width is 3 cm. The upper semicircular ring is fixed at the front end of the shell 7, and the lower semicircular ring is slidably installed at the front end of the shell 7. The position of the lower semicircular ring is adjusted and fixed by the locking screw to position the center of the cable to ensure that the cable end is in the center of the cabin.

[0055] The heating device includes a left half heater and a right half heater, one end of which is connected by a hinge to form a clamp-shaped structure that can be opened and closed; the left half heater and the right half heater are both composed of a heat conduction plate and a protective shell, the protective shell is fixed on the outside of the heat conduction plate and is located in the cabin 6, and the left half heater and the right half heater are closed to form a hollow structure; the heat conduction plate is built with a temperature probe and multiple heating rods 4, and the multiple heating rods 4 are evenly arranged in the heat conduction plate along the circumference to ensure that the cable end is heated evenly during the sealing process, thereby ensuring the sealing quality. The heating rod 4 is connected to a high-temperature resistant cable extending out of the heat conduction plate; the temperature probe is used to feedback the current heating temperature to the temperature control device.

[0056] The input end of the heating device is connected to the output end of the temperature controller, and the temperature controller is used to control the heating temperature of the heating device; the temperature probe returns the temperature signal to the temperature controller to form a temperature feedback loop to improve the accuracy of temperature control. In this embodiment, the temperature probe is a thermocouple 8.

[0057] The temperature control device is used to control the heating temperature of the sealing device. The temperature control device includes an electric controller and a temperature controller. The electric controller is used to convert 220V AC power into the required voltage to power the other devices and itself. The electric controller is provided with a power input interface, and the power input interface is connected to the 220V power supply through a cable to obtain power; the power output interface is connected to the high-temperature resistant cable connected to the heating rod through a connecting cable to power the heating rod; an IGBT and its driver are also provided between the power input interface and the power output interface, and the average power output of the power supply is controlled by the on-off of the IGBT; the electric controller is also provided with a leakage switch. The power input interface is a power aviation plug 12.

[0058] The temperature controller is electrically connected to the thermocouple 8 through another high temperature resistant cable, and is used to monitor the output signal of the thermocouple 8. When it is determined that the heating temperature reaches the set value according to the signal of the thermocouple 8, the power output interface is disconnected from the power output to the heating rod.

[0059] The method of using the sealing device provided in this embodiment is as follows:

[0060] The outer sheath of the cable to be sealed needs to be made of environmentally friendly PVC material. The specific operation method includes the following steps:

[0061] Step 1: Clean up the debris left on the surface of the cable outer sheath after inspection to avoid sharp particles, hair, silk and other debris on the surface of the cable outer sheath;

[0062] Step 2: Put the cable heat shrink cap onto the outer sheath of the cable. When heated, the cable head heat shrink cap shrinks, and the glue in the heat shrink cap melts and adheres tightly to the surface of the cable.

[0063] Step 3, insert the power cable covered with the cable heat shrink cap into the cabin 6;

[0064] Step 4: Turn on the power switch, connect the power of the temperature control device, and use the heating device to heat so that the heat conducting plate and the cable end are heated quickly;

[0065] Step 5: After sealing and heating for 30-45 seconds, the heat shrink cap is completely shrunk and fits tightly with the cable end, the cable is taken out, and the heating device is turned off. Specifically, different heating times are selected according to different cables.

[0066] Step 6: Allow the cable end to cool naturally to room temperature to complete the sealing.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the embodiments, a person skilled in the art should understand that any modification or equivalent replacement of the technical solution of the utility model does not deviate from the spirit and scope of the technical solution of the utility model, and should be included in the scope of the claims of the utility model.

Claims

1. A power cable end sealing device, characterized in that: It comprises a cabin (6), the inner wall of which is provided with a plurality of evenly arranged heating rods (4), a shell (7) is provided outside the cabin (6), and a heat insulation layer (14) is provided between the cabin (6) and the shell (7).

2. A power cable end sealing device according to claim 1, characterized in that: A stopper (3) for limiting the height of the end of the power cable is installed at one end of the cabin (6).

3. A power cable end sealing device according to claim 2, characterized in that: The stopper (3) is slidably connected to the cabin (6).

4. A power cable end sealing device according to claim 2, characterized in that: The limiter (3) comprises a limit plate (31), a slide groove is provided on the limit plate (31), a mounting column (13) is fixed to the front end of the cabin (6), a threaded hole is provided in the mounting column (13), and a fastener passes through the slide groove and is threadedly connected to the mounting column (13); when it is necessary to adjust the height of the limit plate (31), the fastener is loosened, and the limit plate (31) is moved up and down; when the position of the limit plate (31) is determined, the fastener is tightened.

5. A power cable end sealing device according to claim 4, characterized in that: The upper end surface of the limiting plate (31) is arc-shaped.

6. A power cable end sealing device according to claim 5, characterized in that: A temperature probe is installed on the cabin (6).

7. A power cable end sealing device according to claim 1 or 6, characterized in that: The heating rod (4) is electrically connected to the temperature controller.

8. A power cable end sealing device according to claim 1 or 6, characterized in that: A handle (5) is fixed on the housing (7).

9. A power cable end sealing device according to claim 1, characterized in that: A handle (11) is fixed on the housing (7).

Images