Bushing type current transformer

Abstract

The utility model relates to the technical field of current transformers, and discloses a bushing type current transformer which comprises a current transformer body, a threading cylinder is fixed in the current transformer body, and a heat dissipation mechanism used for enhancing heat dissipation efficiency is arranged on the upper surface of the current transformer body. A power connection shell is fixed to the front face of the current transformer body, a power connection column is arranged on the upper surface of the power connection shell, and a splitting mechanism is arranged in the threading cylinder. According to the bushing type current transformer, the heat dissipation mechanism improves the heat dissipation capability of the current transformer body through the heat dissipation fins, meanwhile, a first dustproof net is matched to prevent dust from covering the heat dissipation fins to cause reduction of the heat release efficiency of the heat dissipation fins, and meanwhile, a rotating shaft, a driving motor and fan blades are matched to blow away heat released by the heat dissipation fins; the heat dissipation fins can dissipate heat and can accelerate absorption and release of heat in the current transformer, and therefore it is guaranteed that the temperature in the current transformer is appropriate.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, in particular to a bushing type current transformer. Background Art

[0002] Bushing-type current transformer is a current transformer that is directly mounted on an insulating bushing or an insulating wire. It generally has only one primary coil, and the mainstream loop generally has only one wire passing through the inside of its magnetic ring to provide a magnetic field inside the magnetic ring, thereby generating a sampling current signal in the primary coil. Bushing-type current transformer uses high-quality silicon steel sheets with high magnetic permeability to make magnetic rings. It has high measurement accuracy and low instrument safety factor. It is generally suitable for current measurement, metering and protection of power distribution lines, transformers and electrical equipment in power systems.

[0003] For example, a Chinese patent discloses a bushing-type current transformer, which relates to the technical field of current transformers, including an annular shell and a power connection shell fixedly installed on the outer surface of the annular shell, a threading barrel is fixedly sleeved in the inner ring wall of the annular shell, a wire clamping mechanism is arranged inside the threading barrel, a magnetic conductive ring is fixedly arranged inside the annular shell, a winding coil is wound around the outer surface of the magnetic conductive ring, and an adjustment component is arranged inside the power connection shell. The utility model pulls two pull ear plates outward through the coordinated design of the threading barrel and the wire clamping mechanism, so that the inner and outer clamping plates move back to back to expand the distance between the inner and outer clamping plates, and then the cable of the mainstream circuit is passed through the gap between the inner and outer clamping plates, and then the two pull ear plates are loosened. Under the tension of the tension spring, the inner and outer clamping plates are clamped towards each other, so that the current transformer can be fixed on the detected line, thereby improving the installation portability of the current transformer.

[0004] The above patent still has certain defects. This patent can fix the current transformer on the line to be detected, thereby improving the installation portability of the current transformer. In order to improve the accuracy, the bushing-type current transformer is mostly sealed, and the heat generated inside is released slowly. It is difficult to release heat in a high-temperature environment, causing the internal temperature to rise. Long-term use in high temperature will cause the resistance value of the current transformer to change, thereby affecting the current and causing the accuracy of the current transformer to decrease. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a bushing-type current transformer, which has the advantages of improving heat dissipation efficiency, etc., and solves the problem that long-term use in high temperature will cause the resistance value of the current transformer to change, thereby affecting the current and causing the accuracy of the current transformer to decrease.

[0006] To achieve the above object, the utility model provides the following technical solutions: a bushing-type current transformer, comprising a current transformer body, a threading barrel is fixed inside the current transformer body, a heat dissipation mechanism for enhancing heat dissipation efficiency is provided on the upper surface of the current transformer body, a power connection shell is fixed on the front of the current transformer body, a power connection column is provided on the upper surface of the power connection shell, and a splitting mechanism is provided inside the threading barrel;

[0007] The heat dissipation mechanism includes a first dustproof net, a support plate, a heat dissipation box, a drive assembly, a positioning plate, a connecting frame and no less than two heat dissipation fins, the four support plates are fixed on the upper surface of the current transformer body, the heat dissipation box is fixed on the side of the support plate away from the threading tube, the drive assembly is fixed on the top wall of the inner cavity of the heat dissipation box and is used to improve the heat dissipation efficiency, no less than two heat dissipation fins are fixed on the outside of the current transformer body, the four connecting frames are fixed on the outside of the current transformer body, the first dustproof net is fixed on the front of the connecting frame to prevent dust from adhering to the heat dissipation fins, and two adjacent positioning plates are plugged into the inside of the connecting frame to position the connecting frame.

[0008] By adopting this technical solution, the heat dissipation capacity of the current transformer body itself is improved, and at the same time, the first dustproof net is used to prevent dust from covering the heat dissipation fins and causing a decrease in its heat release efficiency.

[0009] Furthermore, the driving assembly includes a driving motor, a rotating shaft, fan blades and a second dustproof net, one end of the driving motor output shaft is fixed to the rotating shaft, the fan blades are fixed to the outside of the rotating shaft, and the second dustproof net is fixed to the upper surface of the heat dissipation box.

[0010] By adopting this technical solution, the heat released by the heat dissipation fins is blown away, so that the heat dissipation fins can dissipate heat and accelerate the absorption and release of heat inside the current transformer.

[0011] Furthermore, the heat dissipation mechanism is bilaterally symmetrical with the central axis of the current transformer body as the symmetry line, and the heat dissipation fins, which are not less than two in number, are evenly distributed on the outside of the current transformer body in four groups.

[0012] By adopting this technical solution, it is ensured that the heat inside the current transformer is released evenly, avoiding large deviations in the heat release efficiency that lead to heat accumulation in some locations that cannot be dissipated.

[0013] Furthermore, the first dustproof net is in the shape of a rectangular parallelepiped with a hollow interior and a missing side close to the current transformer body, and the left and right side walls of the inner cavity of the connection frame are both provided with first positioning grooves for the positioning plate to be inserted.

[0014] By adopting this technical solution, it is ensured that the first dustproof net can completely cover a group of heat dissipation fins inside and block dust on the outside, and at the same time, the installation of the connection frame is positioned by the positioning plate.

[0015] Furthermore, two ventilation holes are provided on the upper surface of the heat dissipation box, and the second dustproof net is fixed inside the ventilation holes.

[0016] By adopting this technical solution, it is ensured that air can flow from top to bottom when the fan blades rotate without carrying any dust.

[0017] Furthermore, the splitting mechanism includes four connecting rods, a pull plate, a screw rod, an auxiliary plate, a positioning block and a return spring. The four connecting rods are all slidably connected to the inside of the threading barrel. The pull plate is fixed to the end of the connecting rod away from the threading barrel. The pull plate and the interiors of two adjacent connecting rods are threadedly connected to the screw rod. The auxiliary plate is fixed to the end of the screw rod away from the connecting rod. The positioning block is slidably connected to the inside of the pull plate and fixed to the outside of the connecting rod. The return spring is fixed between the opposite sides of the threading barrel and the positioning block.

[0018] By adopting this technical solution, it is convenient for maintenance personnel to remove the pull plate when it is necessary to repair the current transformer body to prevent it from hindering the maintenance work.

[0019] Furthermore, connecting holes for the connecting rod to pass through are provided on both the left and right sides of the threading barrel, and the connecting rod is slidably connected to the inside of the threading barrel through the connecting holes.

[0020] By adopting this technical solution, the connecting rod can move left and right under the drive of the pulling plate.

[0021] Furthermore, a second positioning groove for inserting the positioning block is provided on one side opposite to the pull plates on the left and right sides, and a connecting groove for inserting the connecting rod is provided on one side opposite to the pull plates on the left and right sides.

[0022] By adopting this technical solution, it is convenient to connect the pull plate and the connecting rod, and at the same time, it is prevented that the other end of the return spring will not move together with the connecting rod.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0024] 1. The heat dissipation mechanism of the bushing-type current transformer improves the heat dissipation capacity of the current transformer body itself through the heat dissipation fins, and cooperates with the first dustproof net to prevent dust from covering the heat dissipation fins and causing the heat release efficiency to decrease. At the same time, the heat dissipation fins are blown away by the cooperation of the rotating shaft, the driving motor and the fan blades, so that the heat dissipation fins can dissipate heat and accelerate the absorption and release of the heat inside the current transformer, thereby ensuring that the temperature inside the current transformer is appropriate.

[0025] 2. The disassembly mechanism of the bushing-type current transformer firmly connects the pull plate to the outside of the two connecting rods through screws and auxiliary plates, so that the pull plate can drive the connecting rods to move together when the staff uses it. It is also convenient for maintenance personnel to remove the pull plate when they need to repair the current transformer body to prevent it from hindering the maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 This is a schematic diagram of the heat dissipation mechanism of the utility model;

[0028] Figure 3 This is a schematic diagram of the auxiliary components of the utility model;

[0029] Figure 4 It is a schematic diagram of the splitting mechanism of the utility model.

[0030] In the figure: 1. heat dissipation mechanism; 101. first dust-proof net; 102. support plate; 103. heat dissipation box; 104. rotating shaft; 105. driving motor; 106. second dust-proof net; 107. fan blades; 108. positioning plate; 109. connecting frame; 110. heat dissipation fins; 2. power connection shell; 3. power connection column; 4. splitting mechanism; 401. screw; 402. auxiliary plate; 403. pull plate; 404. reset spring; 405. positioning block; 406. connecting rod; 5. current transformer body; 6. threading barrel. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] See also Figure 1 A bushing-type current transformer in this embodiment includes a current transformer body 5, a threading barrel 6 is fixed inside the current transformer body 5, a heat dissipation mechanism 1 for enhancing heat dissipation efficiency is provided on the upper surface of the current transformer body 5, a power connection shell 2 is fixed on the front of the current transformer body 5, a power connection column 3 is provided on the upper surface of the power connection shell 2, and a splitting mechanism 4 is provided inside the threading barrel 6. The electrical components appearing in the text are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device for control such as a computer, and the existing public power connection technology is not repeated in this text. The industrial power interface is connected to power on the device, and the PLC system controls the entire device to operate as expected.

[0033] See also Figure 2-3 In order to improve the heat dissipation efficiency, the heat dissipation mechanism 1 in this embodiment includes a first dustproof net 101, a support plate 102, a heat dissipation box 103, a driving component, a positioning plate 108, a connecting frame 109 and at least two heat dissipation fins 110, four support plates 102 are fixed on the upper surface of the current transformer body 5, the heat dissipation box 103 is fixed on the side of the support plate 102 away from the threading barrel 6, the driving component is fixed on the top wall of the inner cavity of the heat dissipation box 103 and is used to improve the heat dissipation efficiency, at least two heat dissipation fins 110 are fixed on the outside of the current transformer body 5, and four connecting The frame 109 is fixed to the outside of the current transformer body 5, the first dustproof net 101 is fixed to the front of the connecting frame 109 to prevent dust from adhering to the heat dissipation fins 110, and the two adjacent positioning plates 108 are inserted into the inside of the connecting frame 109 to position the connecting frame 109. The connecting frame 109 is fixed to the outside of the two positioning plates 108 by screws. The left and right sides of the connecting frame 109 are provided with threaded holes for the screws to pass through, and the screws are threadedly connected to the connecting frame 109 through the threaded holes, and the opposite sides of the two adjacent positioning plates 108 are provided with threaded grooves for the screws to be threadedly connected.

[0034] The heat dissipation mechanism 1 is symmetrical on the left and right with the central axis of the current transformer body 5 as the symmetry line. There are at least two heat dissipation fins 110 in four groups and are evenly distributed on the outside of the current transformer body 5. The first dustproof net 101 is shaped like a rectangular parallelepiped with a hollow interior and a missing side close to the current transformer body 5. The left and right side walls of the inner cavity of the connecting frame 109 are provided with first positioning grooves for the positioning plate 108 to be plugged in.

[0035] In this embodiment, the driving component includes a driving motor 105, a rotating shaft 104, a fan blade 107 and a second dustproof net 106. One end of the output shaft of the driving motor 105 is fixed to the rotating shaft 104, the fan blade 107 is fixed to the outside of the rotating shaft 104, the second dustproof net 106 is fixed to the upper surface of the heat sink 103, and the upper surface of the heat sink 103 is provided with two ventilation holes. The second dustproof net 106 is fixed inside the ventilation holes. The control method of the present application is controlled by a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. In addition, the present application is mainly used to protect mechanical devices, so the present application no longer explains the control method and circuit connection in detail.

[0036] It should be noted that the heat dissipation mechanism 1 improves the heat dissipation capacity of the current transformer body 5 itself through the heat dissipation fins 110, and cooperates with the first dustproof net 101 to prevent dust from covering the heat dissipation fins 110 and causing its heat release efficiency to decrease.

[0037] See also Figure 4In order to facilitate the maintenance of the current transformer, the splitting mechanism 4 in this embodiment includes four connecting rods 406, a pull plate 403, a screw 401, an auxiliary plate 402, a positioning block 405 and a reset spring 404. The four connecting rods 406 are all slidably connected to the inside of the threading barrel 6. The opposite sides of the left and right connecting rods 406 are fixed with a clamping plate located inside the threading barrel 6. The cross-section of the clamping plate is L-shaped. The pull plate 403 is fixed to the end of the connecting rod 406 away from the threading barrel 6. The inside of the pull plate 403 and the two adjacent connecting rods 406 are threadedly connected to the screw 401. Then, the auxiliary plate 402 is fixed to one end of the screw rod 401 away from the connecting rod 406, the positioning block 405 is slidably connected to the inside of the pull plate 403 and fixed to the outside of the connecting rod 406, and the return spring 404 is fixed between the opposite side of the wire barrel 6 and the positioning block 405. When fixing the wire, the two pull plates 403 are pulled on the left and right sides of the box respectively to separate the two clamping plates inside the wire barrel 6. After the wire is passed through, the pull plate 403 is released to allow the return spring 404 to pull the pull plate 403 to move to the initial position through the positioning block 405, and at the same time the clamping plate moves toward the wire to clamp the wire.

[0038] In this embodiment, connecting holes for the connecting rod 406 to pass through are provided on the left and right sides of the threading barrel 6, and the connecting rod 406 is slidably connected to the inside of the threading barrel 6 through the connecting holes, and a second positioning groove for the positioning block 405 to be plugged into is provided on the opposite sides of the left and right pull plates 403, and a connecting groove for the connecting rod 406 to be plugged into is provided on the opposite sides of the left and right pull plates 403.

[0039] It should be noted that the splitting mechanism 4 firmly connects the pull plate 403 to the outside of the two connecting rods 406 through the screw 401 and the auxiliary plate 402, so that the pull plate 403 can drive the connecting rods 406 to move together when the staff uses it. It is also convenient for maintenance personnel to remove the pull plate 403 when it is necessary to repair the current transformer body 5 to prevent it from hindering the maintenance work.

[0040] The working principle of the above embodiment is:

[0041] (1) When in use, the threading barrel 6 inside the current transformer body 5 is put on the outside of the wire, and the wire is clamped by the two clamps inside the current transformer body 5 to fix the current transformer body 5. Then the drive motor 105 is started. The drive motor 105 drives the rotating shaft 104 to rotate through the output shaft. The fan blades 107 drive the air to flow quickly to the heat dissipation fins 110 as the rotating shaft 104 rotates. The heat dissipation fins 110 are blown by the wind while releasing the heat inside the current transformer body 5, so that the released heat is quickly dissipated to a distance, thereby allowing the heat dissipation fins 110 to absorb and release the heat inside the current transformer body 5 more quickly. The heat dissipation mechanism 1 improves the heat dissipation capacity of the current transformer body 5 itself through the heat dissipation fins 110, and cooperates with the first dustproof net 101 to prevent dust from covering the heat dissipation fins 110, which causes its heat release efficiency to decrease.

[0042] (2) When the current transformer body 5 needs to be repaired, the auxiliary plate 402 is rotated, and the auxiliary plate 402 drives the screw 401 to rotate together. When the screw 401 rotates, it drives the auxiliary plate 402 away from the pull plate 403. When the screw 401 is separated from the pull plate 403, the pull plate 403 is conveniently pulled away from the connecting rod 406 to separate the pull plate 403 and the connecting rod 406. At this time, the current transformer body 5 is disassembled for maintenance. The disassembly mechanism 4 firmly connects the pull plate 403 to the outside of the two connecting rods 406 through the screw 401 and the auxiliary plate 402, so that the pull plate 403 can drive the connecting rod 406 to move together when the staff uses it. At the same time, it is also convenient for maintenance personnel to remove the pull plate 403 when it is necessary to repair the current transformer body 5 to prevent it from hindering the maintenance work.

Claims

1. A bushing-type current transformer, comprising a current transformer body (5), characterized in that: A threading barrel (6) is fixed inside the current transformer body (5), a heat dissipation mechanism (1) for enhancing heat dissipation efficiency is provided on the upper surface of the current transformer body (5), a power connection shell (2) is fixed on the front of the current transformer body (5), a power connection column (3) is provided on the upper surface of the power connection shell (2), and a splitting mechanism (4) is provided inside the threading barrel (6); The heat dissipation mechanism (1) comprises a first dustproof net (101), a support plate (102), a heat dissipation box (103), a drive assembly, a positioning plate (108), a connection frame (109), and no less than two heat dissipation fins (110), wherein the four support plates (102) are fixed on the upper surface of the current transformer body (5), the heat dissipation box (103) is fixed on a side of the support plate (102) away from the threading barrel (6), and the drive assembly is fixed on the inner cavity of the heat dissipation box (103). The top wall is used to improve the heat dissipation efficiency, the heat dissipation fins (110) of which the number is not less than two are fixed on the outside of the current transformer body (5), the four connection frames (109) are fixed on the outside of the current transformer body (5), the first dustproof net (101) is fixed on the front of the connection frame (109) to prevent dust from adhering to the heat dissipation fins (110), and the two adjacent positioning plates (108) are inserted into the interior of the connection frame (109) to position the connection frame (109).

2. A bushing type current transformer according to claim 1, characterized in that: The driving assembly comprises a driving motor (105), a rotating shaft (104), a fan blade (107) and a second dustproof net (106); one end of an output shaft of the driving motor (105) is fixed to the rotating shaft (104); the fan blade (107) is fixed to the outside of the rotating shaft (104); and the second dustproof net (106) is fixed to the upper surface of the heat dissipation box (103).

3. The bushing type current transformer according to claim 1, characterized in that: The heat dissipation mechanism (1) is bilaterally symmetrical with the central axis of the current transformer body (5) as the symmetry line, and the heat dissipation fins (110) of not less than two are evenly distributed in four groups on the outside of the current transformer body (5).

4. The bushing type current transformer according to claim 1, characterized in that: The first dustproof net (101) is in the shape of a rectangular parallelepiped with a hollow interior and a missing side close to the current transformer body (5), and the left and right side walls of the inner cavity of the connection frame (109) are both provided with first positioning grooves for the positioning plate (108) to be plugged in.

5. A bushing type current transformer according to claim 2, characterized in that: The upper surface of the heat dissipation box (103) is provided with two ventilation holes, and the second dustproof net (106) is fixed inside the ventilation holes.

6. A bushing type current transformer according to claim 1, characterized in that: The splitting mechanism (4) comprises four connecting rods (406), a pull plate (403), a screw rod (401), an auxiliary plate (402), a positioning block (405) and a return spring (404). The four connecting rods (406) are all slidably connected to the inside of the threading barrel (6). The pull plate (403) is fixed to one end of the connecting rod (406) away from the threading barrel (6). The inside of the pull plate (403) and two adjacent connecting rods (406) are both threadedly connected to the screw rod (401). The auxiliary plate (402) is fixed to one end of the screw rod (401) away from the connecting rod (406). The positioning block (405) is slidably connected to the inside of the pull plate (403) and fixed to the outside of the connecting rod (406). The return spring (404) is fixed between the opposite sides of the threading barrel (6) and the positioning block (405).

7. A bushing type current transformer according to claim 6, characterized in that: The left and right sides of the threading barrel (6) are both provided with connection holes for the connection rod (406) to pass through, and the connection rod (406) is slidably connected to the inside of the threading barrel (6) through the connection holes.

8. The bushing type current transformer according to claim 6, characterized in that: The opposite sides of the pull plates (403) on the left and right sides are each provided with a second positioning groove for the positioning block (405) to be inserted into, and the opposite sides of the pull plates (403) on the left and right sides are each provided with a connecting groove for the connecting rod (406) to be inserted into.

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