A compact and high-strength protective box for current transformers

Abstract

The present invention discloses a compact high-strength protection box for an instrument transformer, which comprises a box body. A transformer is bolted to the bottom of the inner wall of the box body, and a connecting wire is arranged below the left side of the transformer. A box cover is arranged above the box body, and heat dissipation holes are equidistantly arranged on the left and right sides of the box body. It further includes: clamping blocks are fixedly connected to the bottom of the box cover at equal intervals, and clamping grooves are formed in the top of the box body at equal intervals. For this compact high-strength protection box for an instrument transformer, when the top of the protection box is impacted by the outside world, the protection plate bears the impact force first, and drives the support block to move under pressure. At the same time, the buffer spring is stretched, so that the elastic force of the buffer spring can further effectively buffer the impact force. Then, as the support block moves in the accommodating groove, the through holes on the support block mix the sodium silicate solution and the acidic solution together to form silicic acid, thereby increasing the structural strength of the box cover itself and improving the protection effect on the internal transformer.

Description

Technical Field

[0001] The present invention relates to the technical field of instrument transformers, and particularly to a compact high-strength protective box for instrument transformers. Background Art

[0002] An instrument transformer is a special transformer, which is widely used in power systems as a signal source for circuits such as measurement, control, indication, and relay protection. In order to prevent the instrument transformer from being collided or flooded with water, it is necessary to use a protective box to protect the important components of the instrument transformer and its related equipment;

[0003] For example, a protective box for a current transformer with the publication number CN219822192U is provided with a box body, a sealing component, a sealing ring, a silica gel washer, a cover body, a spring lock, a hanging ring, and a hook. The spring lock, the hanging ring, and the hook form a set of locking components. A total of four locking components are provided on the left and right sides of the device. Workers can open the locking components by lifting the spring lock and detaching the hanging ring from the hook. After all four locking components are opened, the box body and the cover body can be separated. Conversely, when the cover body is covered on the box body, hanging the four hanging rings on the corresponding hooks and pressing down the spring lock can complete the locking of the device. A protruding part is provided at the bottom of the inner edge of the cover body. When the device is locked, the protruding part presses the silica gel washer, thereby improving the sealing performance of the device. Through the above process, the device can prevent rainwater or water vapor from entering through the gaps of the device and causing the internal equipment to short-circuit, which is beneficial to improving the safety of the device; through the settings of an insulating cylinder, sealant, copper column, threaded rod, wiring ear, metal gasket, and anti-loosening nut, the insulating cylinder is made of ceramic or nylon material. The insulating cylinder is embedded in the side wall of the box body, and the gap at the connection is sealed with sealant. The copper column can be used as a conductor, so that the inside and outside of the device can be connected without affecting the sealing performance of the device. When workers need to connect wires, they only need to unscrew the anti-loosening nut from the threaded rod, remove the metal gasket and the wiring ear, connect the wire to the wiring ear, and then fix the wiring ear back to its original position to complete the wiring. Through the above process, the device can be wired conveniently, which is beneficial to improving the convenience of the device;

[0004] Another example is a protective box for a current transformer with the publication number CN213303886U. When it needs to be opened, first pull the sliding rod. The sliding rod drives the fourth rotating shaft, the fourth rotating shaft drives the rotating rod, the rotating rod drives the third rotating shaft, the third rotating shaft drives the limiting rod, and the limiting rod disengages from the limiting groove. Then the cover plate can be opened. At the same time, the sliding block catches the rotating rod, so as to achieve the purpose of quick opening; the cover plate is fixedly connected to the protective box through a fixing rod, which greatly reduces the opening time and avoids danger;

[0005] When the above technical solution is in use, the mutual inductor is installed inside the box body, and then the cover plate is covered on the box body. Thus, the mutual inductor can be protected by the cover plate and the box body. However, the strength of the protection box itself is poor. When the protection box is impacted by the outside, the cover plate will be broken, resulting in damage to the mutual inductor inside the box body. Subsequently, the protection box cannot withstand a large impact, leading to poor protection for the mutual inductor.

[0006] Therefore, we propose a compact and high-strength mutual inductor protection box to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of the present invention is to provide a compact and high-strength mutual inductor protection box to solve the problem that the strength of the protection box itself is poor in the above-mentioned background technology. When the protection box is impacted by the outside, the cover plate will be broken, resulting in damage to the mutual inductor inside the box body. Subsequently, the protection box cannot withstand a large impact, leading to poor protection for the mutual inductor.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A compact and high-strength mutual inductor protection box, including a box body. A mutual inductor is bolted to the bottom of the inner wall of the box body, and a connecting wire is arranged below the left side of the mutual inductor. A box cover is arranged above the box body, and heat dissipation holes are equally spaced on the left and right sides of the box body;

[0009] It further includes: Blocks are fixedly connected to the bottom of the box cover at equal intervals. Slots are equally spaced on the top of the box body. A power cord penetrates and is connected to the lower part of the left side inside the box body. A protection plate is arranged above the box cover;

[0010] A mixing chamber is formed inside the box cover. Support blocks penetrate and are connected to the inside of the box cover, and the top of the support block is fixedly connected to the bottom of the protection plate. Through holes are formed inside the support block;

[0011] Buffer springs are installed between the box cover and the support blocks. Insulating layers are arranged on the inner walls of the box body and the box cover. Teeth are fixedly arranged on the side of the block at equal intervals;

[0012] A driven gear is rotatably connected to the side of the slot inside the box body. A rack is arranged on the left side of the inner wall of the box body, and the bottom of the rack is fixedly connected to a movable plate. A hole is formed inside the movable plate. One end of the power cord is fixedly connected to a connector.

[0013] Preferably, the support block is arranged in a "Y" shape. The support block is slidably connected to the box cover, and the support block penetrates the inside of the mixing chamber. Sodium silicate solution is stored on the left side of the support block inside the mixing chamber, and acidic solution is stored on the right side of the support block inside the mixing chamber.

[0014] Preferably, the card block and the card slot are in a card-engaging connection, and a limiting groove is provided on the side of the card block away from the tooth block, the multiple tooth blocks on the side of the card block, the driven gear and the rack are all meshingly connected, the rack and the box body are in a sliding connection, and the connecting wire and the connector are in a plug-in connection.

[0015] Preferably, the insulating layer is made of epoxy resin material, and the insulating layer is bonded to the inner walls of the box body and the box cover.

[0016] Preferably, both left and right sides of the box body are penetrated and connected with limiting blocks, and a first return spring is installed between the outer side of the limiting block and the inner wall of the box body.

[0017] Preferably, the limit block is slidably connected to the box body, and the position of the limit block corresponds to that of the limit slot. One end of the limit block and the bottom of the clamping block are both inclined, and the inclined surfaces of the limit block and the clamping block fit together.

[0018] Preferably, the inner wall of the hole is provided with resistance blocks at equal angles, and one end of the four resistance blocks is fixedly connected to a connecting rod, the end of the connecting rod away from the resistance block extends into the interior of the movable plate, and a second return spring is installed between the end of the connecting rod away from the resistance block and the inner wall of the movable plate.

[0019] Preferably, a bidirectional threaded rod is fixedly passed through the interior of the driven gear, and movable plates are sleeved on the outer sides of both ends of the bidirectional threaded rod, and a cleaning brush is bolted to one side of the movable plate.

[0020] Preferably, the threads on the outer sides of both ends of the bidirectional threaded rod are in opposite directions, the two movable plates are threadedly connected to the bidirectional threaded rod, and the movable plates are slidingly connected to the inner wall of the box body, and the bristles of the cleaning brush are in contact with the surface of the heat dissipation hole.

[0021] Compared with the prior art, the invention has the following beneficial effects: the compact high-strength transformer protection box adopts a new structural design, and its specific contents are as follows:

[0022] 1. When the top of the protective box is hit by the outside, the protective plate first bears the impact force, and is pressed to drive the support block to move, while stretching the buffer spring, so that the elastic force of the buffer spring can further effectively buffer the impact force. Then, as the support block moves in the accommodating groove, the through holes on the support block mix the sodium silicate solution and the acid solution together to form silicic acid, thereby increasing the structural strength of the box cover itself and improving the protection effect of the internal mutual inductor;

[0023] 2. After installing the mutual inductor inside the box body, snap the clamping block on the box cover into the clamping groove on the box body. At the same time, the limiting block moves under extrusion. Then, as the clamping block extends, the positions of the limiting block and the limiting groove correspond to each other. Then, the limiting block resets under the elastic force of the first reset spring and snaps into the corresponding limiting groove, which can fix the clamping block, thereby improving the firmness of the connection between the box cover and the box body. At the same time, using the gasket between the box body and the box cover can improve the sealing performance of the connection position between the box body and the box cover;

[0024] 3. When maintenance of the mutual inductor is required, separate the box cover from the box body. At the same time, the clamping block moves upward and separates from the clamping groove, so that the clamping block drives the driven gear to rotate by means of the tooth block on the side, and then the driven gear drives the engaged rack to move downward, and drives the movable plate to move downward, so that the connecting wire on the mutual inductor is separated from the connector on the power line, thereby realizing the power-off operation while separating the box cover from the box body and ensuring the safety of the staff;

[0025] Further, pass the connecting wire on the mutual inductor through the hole on the movable plate, so that the abutting block moves under extrusion. As the connecting wire passes through, the abutting block is always in contact with the connecting wire under the action of the connecting rod and the second reset spring, and can clamp and fix the connecting wire;

[0026] 4. When the clamping block separates from the clamping groove, the tooth block on the side of the clamping block can drive the driven gear to rotate, so that the bidirectional threaded rod rotates, drives the two moving plates to move relatively, and at the same time drives the cleaning brush to move relatively, and cleans the surface of the heat dissipation holes to prevent the heat dissipation holes from being blocked by dust or impurities, affecting the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the schematic diagram of the main sectional structure of the present invention;

[0028] Figure 2 is the schematic diagram of the structure of the protective plate and the support block moving under pressure of the present invention;

[0029] Figure 3 is the schematic diagram of the three-dimensional structure of the box body, box cover and protective plate of the present invention;

[0030] Figure 4 is the schematic diagram of the structure of the separation of the connecting wire and the connector of the present invention;

[0031] Figure 5 is the schematic diagram of the structure of the rack, bidirectional threaded rod and moving plate of the present invention;

[0032] Figure 6 is the schematic diagram of the top sectional structure of the movable plate of the present invention;

[0033] Figure 7 is the schematic diagram of the three-dimensional structure of the support block of the present invention;

[0034] Figure 8 Schematic diagram of the separation structure of the card block and the card slot of the present invention;

[0035] Figure 9 The present invention Figure 1 Enlarged structure diagram at position A in;

[0036] Figure 10 The present invention Figure 1 Enlarged structure diagram at position B in.

[0037] In the figure: 1, box body; 2, box cover; 3, heat dissipation holes; 4, protection plate; 5, card block; 6, card slot; 7, driven gear; 8, power cord; 9, connecting wire; 10, connector; 11, rack; 12, gasket; 13, insulating layer; 14, holes; 15, mixing cavity; 16, support block; 17, through hole; 18, buffer spring; 19, abutting block; 20, connecting rod; 21, first return spring; 22, limiting block; 23, limiting groove; 24, second return spring; 25, movable plate; 26, bidirectional threaded rod; 27, moving plate; 28, cleaning brush. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to Figures 1-10 , the present invention provides the following technical solution: a compact and high-strength protection box for transformers;

[0040] Embodiment 1: In order to solve the problem that the strength of the protection box itself in the prior art is poor, so that when the protection box is impacted by the outside world, the cover plate will be broken, resulting in damage to the transformer in the box body 1, and then the protection box cannot withstand a large impact, resulting in poor protection for the transformer. Therefore, the following solution is disclosed. Specifically refer to Figures 1-3 And Figure 7 And Figure 9 As shown in, it includes a box body 1, a transformer is bolted to the bottom of the inner wall of the box body 1, and a connecting wire 9 is arranged below the left side of the transformer. A box cover 2 is arranged above the box body 1, and heat dissipation holes 3 are equidistantly arranged on the left and right sides of the box body 1;

[0041] It further includes: Clamping blocks 5 are fixedly connected at equal intervals at the bottom of the box cover 2, clamping grooves 6 are provided at equal intervals at the top of the box body 1, limiting blocks 22 penetrate and are connected through both the left and right sides inside the box body 1, and a first return spring 21 is installed between the outer side of the limiting block 22 and the inner wall of the box body 1. The limiting block 22 is slidably connected to the box body 1, and the position of the limiting block 22 corresponds to that of the limiting groove 23. One end of the limiting block 22 and the bottom of the clamping block 5 are both inclined, and the inclined surfaces of the limiting block 22 and the clamping block 5 are in contact with each other. A power cord 8 penetrates and is connected through the lower part on the left side inside the box body 1, and a protective plate 4 is arranged above the box cover 2; a mixing cavity 15 is provided inside the box cover 2, support blocks 16 penetrate and are connected through the inside of the box cover 2, and the top of the support block 16 is fixedly connected to the bottom of the protective plate 4, and through holes 17 are provided inside the support block 16. The support block 16 is arranged in a "Y" shape, the support block 16 is slidably connected to the box cover 2, and the support block 16 penetrates through the inside of the mixing cavity 15. Sodium silicate solution is stored on the left side of the support block 16 inside the mixing cavity 15, and acidic solution is stored on the right side of the support block 16 inside the mixing cavity 15; a buffer spring 18 is installed between the box cover 2 and the support block 16, and insulating layers 13 are arranged on the inner walls of the box body 1 and the box cover 2. The insulating layer 13 is made of epoxy resin material, and the insulating layer 13 is bonded to the inner walls of the box body 1 and the box cover 2;

[0042] During use, the staff places the mutual inductor at the bottom of the inner wall of the box body 1 and fixes it with bolts. Then, the staff aligns the clamping blocks 5 on the box cover 2 with the clamping grooves 6 on the box body 1 and snaps them in. At this time, the limiting blocks 22 are pushed and move. After that, as the clamping blocks 5 extend in, the positions of the limiting blocks 22 and the limiting grooves 23 correspond to each other. Then, the limiting blocks 22 reset under the elastic force of the first return spring 21 and snap into the corresponding limiting grooves 23, which can fix the clamping blocks 5, thereby improving the firmness of the connection between the box cover 2 and the box body 1. At the same time, by using the sealing gasket 12 between the box body 1 and the box cover 2, the sealing performance of the connection position between the box body 1 and the box cover 2 can be improved. Then, when the top of the protective box is impacted by the outside, the protective plate 4 bears the impact force first and drives the support block 16 to move under pressure, while stretching the buffer spring 18, so that the elastic force of the buffer spring 18 can further effectively buffer the impact force. After that, as the support block 16 moves inside the mixing cavity 15, the through holes 17 on the support block 16 mix the sodium silicate solution and the acidic solution in the mixing cavity 15 together (since the box cover 2 is impacted, it will generate a certain vibration, making the mixing of the two liquids in the mixing cavity 15 more sufficient), and form silicic acid, thereby increasing the structural strength of the box cover 2 itself and improving the protection effect on the internal mutual inductor.

[0043] Embodiment 2: Different from Embodiment 1, in this embodiment, the driven gear 7 is used to drive the engaged rack 11 to move downward, which can drive the connection wire 9 to separate from the connector 10 on the power supply wire 8, and can perform a power-off operation on the mutual inductor. For specific reference, see Figure 1 and Figures 3-6 and Figure 10 As shown, tooth blocks are fixedly arranged at equal intervals on the side surface of the clamping block 5; a driven gear 7 is rotatably connected to the side of the card slot 6 inside the box body 1, a rack 11 is arranged on the left side of the inner wall of the box body 1, the clamping block 5 is in snap connection with the card slot 6, and a limiting groove 23 is formed on the side of the clamping block 5 away from the tooth block. A plurality of tooth blocks on the side surface of the clamping block 5, the driven gear 7 and the rack 11 are all in meshing connection, the rack 11 is in sliding connection with the box body 1, and a movable plate 25 is fixedly connected to the bottom of the rack 11. There are holes 14 inside the movable plate 25; one end of the power supply wire 8 is fixedly connected with a connector 10, the connection wire 9 is in plug-in connection with the connector 10, resisting blocks 19 are arranged at equal angles on the inner wall of the hole 14, and one end of the four resisting blocks 19 is fixedly connected with a connecting rod 20. The end of the connecting rod 20 away from the resisting block 19 extends into the inside of the movable plate 25, and a second return spring 24 is installed between the end of the connecting rod 20 away from the resisting block 19 and the inner wall of the movable plate 25;

[0044] When installing the mutual inductor, the connection wire 9 on the mutual inductor is passed through the hole 14 on the movable plate 25, so that the resisting block 19 is squeezed and moves. As the connection wire 9 passes through, the resisting block 19 is always in contact with the connection wire 9 under the action of the connecting rod 20 and the second return spring 24, and can clamp and fix the connection wire 9. Then when the staff needs to maintain the mutual inductor, the staff pulls the two limiting blocks 22 outside the box body 1 to separate them from the limiting groove 23, which can release the limit on the clamping block 5. Then the box cover 2 is pulled upward to separate the clamping block 5 from the card slot 6, and at the same time the box cover 2 is separated from the box body 1. At this time, the clamping block 5 drives the driven gear 7 to rotate by using the tooth blocks on the side surface, and then the driven gear 7 drives the engaged rack 11 to move downward, and drives the movable plate 25 to move downward, so that the connection wire 9 on the mutual inductor is separated from the connector 10 on the power supply wire 8, thereby realizing the power-off operation of the mutual inductor while separating the box cover 2 from the box body 1, ensuring the safety of the staff. Then when the maintenance is completed, the staff covers the box cover 2, so that the clamping block 5 drives the driven gear 7 to rotate in the reverse direction by using the multiple tooth blocks on the side surface. At the same time, the driven gear 7 drives the rack 11 and the movable plate 25 to move upward, so that the connection wire 9 moves upward and is inserted into the connector 10 on the power supply wire 8, and can perform a power-on operation on the mutual inductor.

[0045] Embodiment 3: Different from Embodiment 2, in this embodiment, the cleaning brush 28 is used to move along the horizontal direction of the heat dissipation holes 3, which can clean them and prevent the heat dissipation holes 3 from being blocked by dust or impurities. For specific reference, seeFigure 1 With Figures 3-5 And Figure 8 As shown, a bidirectional threaded rod 26 is fixedly penetrated inside the driven gear 7, and moving plates 27 are sleeved on the outer sides of both ends of the bidirectional threaded rod 26. A cleaning brush 28 is bolted to one side of the moving plate 27. The threads on the outer sides of both ends of the bidirectional threaded rod 26 are in opposite trends. The two moving plates 27 are in threaded connection with the bidirectional threaded rod 26, and the moving plates 27 are in sliding connection with the inner wall of the box body 1. The brush position of the cleaning brush 28 is in contact with the surface of the heat dissipation hole 3;

[0046] By using the heat dissipation holes 3 on both sides of the box body 1, the heat generated when the mutual inductor works can be discharged from the heat dissipation holes 3, avoiding the heat from accumulating in the box body 1 and affecting the use performance of the mutual inductor. At the same time, the air circulation in the box body 1 is ensured. Then, when the clamping block 5 on the box cover 2 is separated from the clamping groove 6 on the box body 1, the toothed block on the side of the clamping block 5 can drive the driven gear 7 to rotate, causing the bidirectional threaded rod 26 to rotate, driving the two moving plates 27 to move relatively, and at the same time driving the cleaning brush 28 to move relatively to clean the surface of the heat dissipation hole 3, preventing the heat dissipation hole 3 from being blocked by dust or impurities and affecting the heat dissipation effect.

[0047] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A compact and high-strength protection box for an instrument transformer, comprising a box body (1). The bottom of the inner wall of the box body (1) is bolted with an instrument transformer, and a connecting wire (9) is arranged below the left side of the instrument transformer. A box cover (2) is arranged above the box body (1), and heat dissipation holes (3) are equidistantly arranged on the left and right sides of the box body (1); It is characterized in that It further includes: The bottom of the box cover (2) is fixedly connected with clamping blocks (5) at equal intervals. The top of the box body (1) is provided with clamping grooves (6) at equal intervals. A power cord (8) penetrates and is connected below the left side inside the box body (1). A protection plate (4) is arranged above the box cover (2); Support blocks (16) penetrate and are connected inside the box cover (2), and the top of the support blocks (16) is fixedly connected to the bottom of the protection plate (4), and through holes (17) are opened inside the support blocks (16); The support blocks (16) are arranged in a "Y" shape, and the support blocks (16) are slidably connected to the box cover (2); A buffer spring (18) is installed between the box cover (2) and the support blocks (16). Insulating layers (13) are arranged on the inner walls of the box body (1) and the box cover (2). Tooth blocks are fixedly arranged at equal intervals on the side of the clamping blocks (5); A driven gear (7) is rotatably connected to the side of the clamping groove (6) inside the box body (1). A rack (11) is arranged on the left side of the inner wall of the box body (1), and the bottom of the rack (11) is fixedly connected with a movable plate (25). There are holes (14) inside the movable plate (25). One end of the power cord (8) is fixedly connected with a connector (10); the connecting wire (9) passes through the holes (14) on the movable plate (25); the connecting wire (9) is inserted and connected with the connector (10); the rack (11) is meshed with the driven gear (7); the tooth blocks on the side of the clamping block can drive the driven gear to rotate; A bidirectional threaded rod (26) is fixedly penetrated inside the driven gear (7), and moving plates (27) are sleeved on the outer sides of both ends of the bidirectional threaded rod (26), and a cleaning brush (28) is bolted to one side of the moving plate (27); The threads on the outer sides of both ends of the bidirectional threaded rod (26) are in opposite trends. The two moving plates (27) are threadedly connected to the bidirectional threaded rod (26), and the moving plates (27) are slidably connected to the inner wall of the box body (1). The brush position of the cleaning brush (28) is in contact with the surface of the heat dissipation holes (3); Resistance blocks (19) are arranged at equal angles on the inner wall of the hole (14), and one end of the four resistance blocks (19) is fixedly connected with a connecting rod (20). The end of the connecting rod (20) away from the resistance block (19) extends into the inside of the movable plate (25), and a second return spring (24) is installed between the end of the connecting rod (20) away from the resistance block (19) and the inner wall of the movable plate (25).

2. The compact high-strength protection box for current transformers according to claim 1, characterized in that: The clamping block (5) is snap-fitted with the clamping groove (6), and a limiting groove (23) is opened on the side of the clamping block (5) away from the tooth block. The rack (11) is slidably connected to the box body (1).

3. A compact and high-strength protective box for an instrument transformer according to claim 1, characterized in that: The insulating layer (13) is made of epoxy resin material, and the insulating layer (13) is bonded to the inner walls of the box body (1) and the box cover (2).

4. A compact and high-strength protection box for an instrument transformer according to claim 1, characterized in that: On both the left and right sides inside the box body (1), there are through-connected limit blocks (22), and a first return spring (21) is installed between the outer side of the limit block (22) and the inner wall of the box body (1).

5. A compact high-strength protective box for an instrument transformer according to claim 4, characterized in that: The limit block (22) is slidably connected to the box body (1), and the position of the limit block (22) corresponds to that of the limit groove (23). One end of the limit block (22) and the bottom of the clamping block (5) are both inclined, and the inclined surfaces of the limit block (22) and the clamping block (5) are in contact with each other.

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