550kV external current transformer glue pouring unit

Abstract

The utility model discloses a 550kV external current transformer glue pouring unit, and relates to the field of electrical equipment, the 550kV external current transformer glue pouring unit comprises a shell, and a floating shell is made of a plastic material and is hollow; one end of the floating shell longitudinally slides on the inner wall of the first shell, and the end, away from the CT coil, of the floating shell is fixedly provided with a silica gel flat tube communicated with the outside in a communicated mode. Air holes communicated with an inner cavity of the floating shell are formed in the two sides of the floating shell, and air valve assemblies used for opening and closing the air holes are arranged at the positions, corresponding to the air holes, of the two sides of the inner wall of the floating shell. Compared with the existing glue filling speed, the device can greatly improve the glue filling speed and the exhaust speed, and meanwhile, attention needs to be paid to that multiple factors, such as temperature and humidity, are caused when bubbles are prevented from being generated during glue filling, so that the device is designed on the basis of the precondition.

Description

Technical Field

[0001] The present application relates to the field of electrical equipment, and in particular to a 550kV external current transformer potting unit. Background Art

[0002] An external current transformer (CT) is a power measurement device primarily used to measure high currents in power systems. Unlike traditional internal CTs, external CTs do not require current interruption within the circuit. Instead, they measure current by being externally attached to the cable. This design simplifies installation and avoids the risks associated with interrupting the circuit.

[0003] When glue is currently injected into the current transformer, the glue enters the current transformer housing and squeezes the air, causing the air to be discharged through the air holes or air valves. However, poor air discharge through the air holes or air valves can lead to air accumulation, which in turn causes air bubbles to form inside the glue during glue injection, resulting in unqualified glue injection quality. Utility Model Content

[0004] In order to improve the problem of poor glue filling quality caused by poor exhaust during glue filling, the present application provides a 550kV external current transformer glue filling unit.

[0005] The present application provides a 550kV external current transformer glue potting unit adopting the following technical solution:

[0006] A 550kV external current transformer potting unit comprises a housing and an air inlet pipe disposed at an upper end of the housing 1 and communicating with an inner cavity of the housing. A breather valve communicating with the inner cavity of the housing is disposed on one side of the upper end of the housing. The unit is characterized in that a CT coil is fixedly disposed within the inner cavity of the housing, a gap is provided between the outer side of the CT coil and an inner wall of the housing for movement of a floating shell, and the floating shell is made of a hollow plastic material.

[0007] One end of the floating shell slides longitudinally on an inner wall of the outer shell, and one end of the floating shell away from the CT coil is connected to a silicone flat tube connected to the outside.

[0008] Both sides of the floating shell are provided with air holes communicating with the inner cavity of the floating shell, and both sides of the inner wall of the floating shell are provided with air valve components for opening and closing the air holes at positions corresponding to the air holes.

[0009] By adopting the above technical solution, the floating shell is used to float on the glue to discharge the squeezed gas in time, avoiding the gas from re-entering the glue due to untimely discharge inside the shell, thereby reducing the generation of bubbles inside the glue.

[0010] Preferably, a second connecting rod is fixed through both sides of one end of the floating shell away from the CT coil, and a first bearing is fixed at both ends of the second connecting rod.

[0011] By adopting the above technical solution, the provision of the bearing 1 can make the floating shell rise more smoothly, reduce the friction resistance between the structures, and prevent the floating shell from being submerged by glue.

[0012] Preferably, a second longitudinal groove for placing a floating shell is opened on one side of the inner wall of the outer shell 1, and a first longitudinal groove for placing a first bearing is opened on both sides of the second longitudinal groove.

[0013] By adopting the above technical solution, the setting of the longitudinal groove 1 plays a guiding and limiting role on the bearing, so that it can move as expected.

[0014] Preferably, an exhaust pipe is fixed through the upper end of the shell and the position corresponding to the second longitudinal groove, and the end of the silicone flat tube away from the floating shell is fixed to one end of the exhaust pipe.

[0015] By adopting the above technical solution, a nut is provided on the exhaust pipe, which needs to be used according to actual usage conditions. The silicone flat tube still needs to maintain internal connectivity to achieve exhaust when deformed.

[0016] Preferably, arc-shaped plates are fixedly provided on both sides of the surface of the floating shell at the lower ends of the air holes.

[0017] By adopting the above technical solution, the arrangement of the curved plates is similar to the wings of an airplane, which can increase the contact area and thus increase the buoyancy of the floating shell.

[0018] Preferably, the air valve assembly comprises a U-shaped frame fixed to the inner wall of the floating shell and located on both sides of the air vent, and the opposite surfaces of the U-shaped frame are provided with limiting grooves for limiting the bearing.

[0019] By adopting the above technical solution, the setting of the limit groove plays a guiding and limiting role for the second bearing, so that it can move as expected.

[0020] Preferably, a connecting rod 1 is fixed between the two bearings 2, and the middle portion of the connecting rod 1 is fixed in a connecting plate that slides in the U-shaped frame.

[0021] By adopting the above technical solution, the connecting rods are connected and fixed together, so that the connecting plate can move stably on the U-shaped frame.

[0022] Preferably, a sealing plate for opening and closing the air vent is fixedly provided on the side of the connecting plate facing the air vent, and under normal conditions, an exhaust gap is provided between the sealing plate and the air vent.

[0023] By adopting the above technical solution, the provision of the sealing plate can seal and connect the air holes, thereby enabling the device to achieve vacuum glue pouring action, thereby increasing the practicality of the glue pouring structure of the device.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. Using the floating shell to float on the glue can quickly discharge the squeezed air to avoid gas backflow, which will cause bubbles to form inside the glue and affect the quality of the glue.

[0026] 2. The air valve assembly can enable the device to achieve vacuum glue pouring, thereby increasing the glue pouring types of the device and effectively improving the glue pouring quality. It can also achieve vacuum glue pouring without affecting the natural exhaust of gas, greatly increasing the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic front view of the entire application;

[0028] Figure 2 This is a schematic front cross-sectional view of the entire application;

[0029] Figure 3 This is a schematic diagram of the connection between the longitudinal groove 2 of the shell and the floating shell of the present application;

[0030] Figure 4 This is a front cross-sectional schematic diagram of the longitudinal groove 2 of the shell and the floating shell of the present application;

[0031] Figure 5 This is a schematic diagram of the connection between the floating shell and the bearing of this application;

[0032] Figure 6 This is a schematic diagram of the connection between the floating shell and the air valve assembly of this application;

[0033] Figure 7 This is a schematic diagram of the explosion of the gas valve assembly of this application.

[0034] Reference numerals: 1, housing; 2, air inlet pipe; 3, air vent valve; 4, CT coil; 5, filler; 6, floating shell; 7, air vent; 8, curved plate; 9, bearing 1;

[0035] 10. Longitudinal groove one; 11. Longitudinal groove two; 12. Silicone flat tube;

[0036] 13. Valve assembly; 131. Sealing plate; 132. Connecting plate; 133. U-shaped frame; 134. Limiting groove; 135. Bearing 2; 136. Connecting rod 1;

[0037] 14. Connecting rod 2; 15. Exhaust pipe. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-7 This application is described in further detail.

[0039] The embodiment of the present application discloses a 550kV external current transformer potting unit.

[0040] Reference Figure 1 、 Figure 2 、 Figure 6 A 550kV external current transformer glue filling unit includes a shell 1, an external current transformer shell 1 and an air inlet pipe 2 fixed at the middle of the upper end of the shell 1 and connected to the inner cavity of the shell 1. The air inlet pipe 2 has a one-way sealing property and belongs to a single air inlet valve. A breathable valve 3 is fixed on one side of the upper end of the shell 1. The breathable valve 3 is connected to the inner cavity of the shell 1. A CT coil 4 is fixed in the middle of the outer ring of the inner cavity of the shell 1. A gap is provided between the outer side of the CT coil 4 and an inner wall of the shell 1. A floating shell 6 can move longitudinally in the gap. A filler 5 is fixed on one side of the CT coil 4. One side of the filler 5 is fixed to the other inner wall of the shell 1. The filler 5 is preferably made of polyurethane glue to improve the stability of the fixation of the CT coil 4. The floating shell 6 is made of plastic and is hollow.

[0041] The mixed protective gas is injected into the housing 1 through the air inlet pipe 2 to protect the internal electrical system. At the same time, the air valve 3 can balance the air pressure inside and outside the housing 1, thereby making the external current transformer work more stably.

[0042] A circular connecting rod 2 14 is fixed longitudinally on both sides of the end of the floating shell 6 away from the CT coil 4. The two connecting rods 2 14 are arranged longitudinally in parallel. Both ends of the two connecting rods 2 14 are fixed to the inner ring of the bearing 1 9. A longitudinal groove 2 11 is provided on one side of the inner wall of the outer shell 1. One end of the floating shell 6 is provided in the longitudinal groove 2 11 and the width is adapted. A longitudinal groove 10 is provided on both sides of the longitudinal groove 2 11. Four bearings 9 are all provided inside the longitudinal groove 10 so that the outer ring of the bearing 1 9 contacts the inner wall of the longitudinal groove 10. An exhaust pipe 15 is fixed through the upper end of the outer wall of the outer shell 1. The exhaust pipe 15 corresponds to the top position of the longitudinal groove 2 11. The end of the silicone flat tube 12 away from the floating shell 6 is fixed to the end of the exhaust pipe 15 located inside the longitudinal groove 2 11. The folded shape of the silicone flat tube 12 is as follows Figure 4 shown.

[0043] When glue is poured into the shell 1, the glue will gradually fill the gap. Since the floating shell 6 is lighter, it will float under the buoyancy of the glue, thereby driving the floating shell 6 to move upward in the longitudinal groove 2 11. At the same time, the bearing 1 9 rolls in the longitudinal groove 10. Since the floating shell 6 floats on the upper end of the glue, the squeezed air can enter the floating shell 6 through the air vent 7 and then enter the exhaust pipe 15 through the silicone flat tube 12 to be discharged to the outside. This arrangement avoids the gas from being concentrated and discharged from the exhaust holes at other positions of the shell 1, resulting in untimely gas discharge and the formation of bubbles in the glue. This arrangement can discharge the gas near the glue in real time and effectively avoid excessive accumulation of gas in the shell 1.

[0044] Reference Figure 3 、 Figure 4 One end of the floating shell 6 slides longitudinally in the longitudinal groove 11 on the inner wall of the shell 1. The end of the floating shell 6 away from the CT coil 4 is connected to a silicone flat tube 12 connected to the outside world. The surface of the silicone flat tube 12 is set to be smooth and the bend is non-contact to avoid large friction that causes the floating shell 6 to be unable to rise.

[0045] Reference Figure 5 、 Figure 6 There are air holes 7 on both sides of the floating shell 6. The two air holes 7 are symmetrical and connected to the inner cavity of the floating shell 6. There are arc plates 8 fixed on the surface of the floating shell 6 on both sides of the air holes 7. The two arc plates 8 are located at the lower end of the air holes 7, and the arc plates 8 are bent and opened downward.

[0046] Reference Figure 6 、 Figure 7 , air valve assemblies 13 for opening and closing the air vent 7 are provided on both sides of the inner wall of the floating shell 6. The air valve assembly 13 is arranged at a position corresponding to the air vent 7. The air valve assembly 13 includes a U-shaped frame 133 fixed on the inner wall of the floating shell 6. The two ends of the U-shaped frame 133 are fixed on both sides of the air vent 7. The opposite surface of the U-shaped frame 133 is provided with a limiting groove 134 for limiting the position of the second bearing 135. The second bearing 135 is arranged in the limiting groove 134 so that the outer ring of the second bearing 135 abuts against the inner wall of the limiting groove 134. The two bearings 135 are provided with a plurality of air valve assemblies 133, 133, 133, 133, 133, 133, 134 ... The inner circles of 135 are fixed through the two ends of the connecting rod 136, and the middle part of the connecting rod 136 is fixed on both sides of the connecting plate 132, so that the connecting plate 132 can slide in the U-shaped frame 133. A sealing plate 131 is fixed on the side of the connecting plate 132 facing the air vent 7. The sealing plate 131 enables the air vent 7 to be opened and closed. Under normal circumstances, an exhaust gap is set between the sealing plate 131 and the air vent 7. The exhaust gap distance is set to 2-4mm, which is the maximum distance when the sealing plate 131 is opened.

[0047] After the gas inside the shell 1 enters the air vent 7, it will enter the floating shell 6 through the exhaust gap. The gas will push the sealing plate 131 to move, thereby increasing the distance between the sealing plate 131 and the air vent 7 to increase the air flow. At the same time, it should be noted that the exhaust gap cannot be set too large, otherwise it will affect the subsequent vacuum use. The sealing plate 131 will drive the bearing 2 135 to move in the limit groove 134 through the connecting plate 132 and the connecting rod 1 136.

[0048] When the outer shell 1 is evacuated, due to the different pressures inside and outside the floating shell 6, the sealing plate 131 can be driven to abut against the inner wall of the floating shell 6 to seal the air vent 7. It should be noted that when evacuating the outer shell 1, except for the special interface for vacuuming, other pipes connected to the outside world need to be sealed, such as sealing the exhaust pipe 15 with a nut to ensure that the vacuum can be smoothly drawn in the outer shell 1, thereby realizing vacuum filling and reducing the generation of bubbles.

[0049] Among them, bearing 1 9 and bearing 2 135 are both existing structures, which include outer rings, inner rings, balls and other structures, and will not be described in detail.

[0050] The implementation principle of a 550kV external current transformer glue filling unit in the embodiment of the present application is as follows: the user fills the inside of the shell 1 with glue through the air inlet pipe. During the glue filling, the glue will fill the gaps between the internal structures of the shell 1 and squeeze out the air. At the same time, the floating shell 6 floats on the glue and can discharge the squeezed air through the silicone flat tube 12 and the exhaust pipe 15 through the air vent 7 as soon as possible. The floating shell 6 rises as the glue rises and can discharge the gas in real time, avoiding the internal gas of the shell 1 from being discharged in time during the glue filling. Even if the glue filling speed is increased, the gas can be exhausted smoothly to avoid air entering the glue. Compared with the existing glue filling speed, this device can greatly increase the glue filling speed and the exhaust speed. At the same time, it should be noted that there are many factors that affect the prevention of bubbles in glue filling, such as temperature and humidity. Therefore, this patent is designed based on this premise.

[0051] 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 550kV external current transformer glue potting unit, comprising a housing (1) and an air inlet pipe (2) arranged at the upper end of the housing (1) and communicating with the inner cavity of the housing (1), a breathable valve (3) communicating with the inner cavity of the housing (1) is arranged on one side of the upper end of the housing (1), and is characterized in that: A CT coil (4) is fixedly arranged in the inner cavity of the housing (1); a gap for a floating shell (6) to move is provided between the outer side of the CT coil (4) and an inner wall of the housing (1); the floating shell (6) is made of a plastic material and is hollow; One end of the floating shell (6) slides longitudinally on an inner wall of the outer shell (1), and one end of the floating shell (6) away from the CT coil (4) is connected to a silicone flat tube (12) connected to the outside world; Both sides of the floating shell (6) are provided with air holes (7) communicating with the inner cavity of the floating shell (6), and air valve components (13) for opening and closing the air holes (7) are provided at positions corresponding to the air holes (7) on both sides of the inner wall of the floating shell (6).

2. A 550kV external current transformer potting unit according to claim 1, characterized in that: Connecting rod 2 (14) is fixed through both sides of one end of the floating shell (6) away from the CT coil (4), and bearing 1 (9) is fixed at both ends of the connecting rod 2 (14).

3. The 550kV external current transformer potting unit according to claim 1, characterized in that: A second longitudinal groove (11) for placing a floating shell (6) is provided on one side of the inner wall of the outer shell (1), and a first longitudinal groove (10) for placing a first bearing (9) is provided on both sides of the second longitudinal groove (11).

4. The 550kV external current transformer potting unit according to claim 1, characterized in that: An exhaust pipe (15) is fixed through the upper end of the shell (1) and the position corresponding to the second longitudinal groove (11), and one end of the silicone flat tube (12) away from the floating shell (6) is fixed to one end of the exhaust pipe (15).

5. The 550kV external current transformer potting unit according to claim 1, characterized in that: Arc-shaped plates (8) are fixedly provided on both sides of the surface of the floating shell (6) at the lower ends of the air holes (7).

6. The 550kV external current transformer potting unit according to claim 1, characterized in that: The air valve assembly (13) comprises a U-shaped frame (133) fixed on the inner wall of the floating shell (6) and located on both sides of the air vent (7). The opposite surface of the U-shaped frame (133) is provided with a limiting groove (134) for limiting the position of the second bearing (135).

7. The 550kV external current transformer potting unit according to claim 6, characterized in that: A connecting rod (136) is fixed between the two bearings (135), and the middle portion of the connecting rod (136) is fixed in a connecting plate (132) that slides in the U-shaped frame (133).

8. The 550kV external current transformer potting unit according to claim 7, characterized in that: A sealing plate (131) for opening and closing the vent hole (7) is fixedly provided on one side of the connecting plate (132) facing the vent hole (7). Under normal conditions, an exhaust gap is provided between the sealing plate (131) and the vent hole (7).

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