A buried transformer

Abstract

The application provides a buried transformer, which comprises a pre-buried box and a transformer body arranged in the pre-buried box. The pre-buried box comprises an open-top box body, a lifting frame and a cover body, the cover body is arranged on the box body, a receiving space is formed between the cover body and the box body, the lifting frame is located in the receiving space, and the cover body is connected with the top of the lifting frame, so that the lifting frame can move up and down relative to the box body along with the cover body; the transformer body is arranged in the lifting frame. The buried transformer has a compact structure and saves space, and the transformer body can be conveniently lifted without arranging an electric mechanism in the buried transformer, so that maintenance is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to an underground transformer. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components include a primary coil, a secondary coil, and an iron core (magnetic core). It performs functions such as voltage conversion, current conversion, impedance conversion, isolation, and voltage regulation (magnetic saturation transformer). As fundamental equipment for power transmission and distribution, transformers are widely used in various power consumption sectors.

[0003] With the rapid development of large-scale urban construction, numerous high-rise buildings have sprung up. To ensure the rational use of construction area, the transformer equipment used to power these buildings needs to be continuously miniaturized. This means that the transformers required to power these buildings should not occupy urban roads or green areas, while also ensuring that they do not affect the city's appearance or pedestrian safety. While box-type transformers offer the advantages of small size and light weight, they still occupy above-ground space, leading to the emergence of underground transformers. By burying at least a portion of their structure underground, underground transformers effectively reduce the utilization of surface resources, thereby enhancing the greening effect of urban construction.

[0004] Existing underground transformers include lifting underground transformers and fixed underground transformers. Among them, the fixed underground transformer is fixedly installed underground, and its structure is relatively stable, but it is not convenient for maintenance. In order to avoid the need to take out the fixed underground transformer for maintenance, it is usually necessary to set up a larger storage space underground, which is used to fix the fixed underground transformer while facilitating maintenance personnel to go underground to repair the fixed underground transformer. For example, the transformer in the separate box-type transformer disclosed in the Chinese invention patent application with patent publication number CN114446589A is a fixed underground transformer. The separate box-type transformer is provided with a pre-buried box, which is used to be buried underground, and the transformer is provided in the pre-buried box. When the transformer needs to be repaired, the maintenance personnel can go down from the ground to the pre-buried box to repair the transformer through an escalator provided in the pre-buried box. Although this type of transformer allows maintenance personnel to inspect the transformer without having to move it, the embedded box obviously needs to have sufficient space for personnel to enter and exit and inspect. This results in the structure of the separate box transformer being not compact enough, increasing material costs and occupied space. At the same time, due to the limited space and dim light in the embedded box, it is not conducive to the maintenance personnel to conduct a comprehensive and careful inspection of the transformer.

[0005] The lifting type underground transformer is provided with a lifting device, and the transformer body can be lifted by the lifting device to expose the transformer body to the ground, so that the transformer body is convenient to maintain. Compared with the fixed type underground transformer, the lifting type underground transformer is more space-saving. However, the existing lifting type underground transformer needs to set the power equipment such as a motor underground, so that the power equipment is easy to be damaged. Moreover, the power equipment usually needs to be lifted by a transmission mechanism such as a screw rod or a gear and rack, and the underground environment is poor, so that the transmission structure is easy to accumulate dust and rust, thereby affecting the transmission effect and causing the unstable lifting and lowering effect of the transformer. The Chinese patent application with the patent publication number CN111933404A discloses a lifting type underground transformer, and the vertical lifting structure is provided with two motors to drive the gear and rack transmission to lift the transformer. The two motors can avoid the trouble caused by the failure of the lifting type underground transformer. However, the method of setting an additional motor cannot completely avoid the damage of the motor, and the equipment cost and the occupied space are increased. Moreover, the transmission structure is still easy to accumulate dust and rust.

[0006] Therefore, it is necessary to develop a new underground transformer structure to solve the problems of the prior art. SUMMARY

[0007] The technical problem to be solved by the embodiment of the present application is to provide a compact and space-saving underground transformer, which can conveniently lift the transformer body without setting a motor in the underground transformer to facilitate maintenance.

[0008] To solve the above technical problems, the embodiment of the present application provides an underground transformer, which comprises a pre-buried box and a transformer body arranged in the pre-buried box. The pre-buried box comprises a box body with an upper opening, a lifting frame and a cover. The cover is arranged on the box body, and a receiving space is formed between the cover and the box body. The lifting frame is located in the receiving space, and the top of the lifting frame is connected with the cover, so that the lifting frame can move up and down relative to the box body. The transformer body is arranged in the lifting frame.

[0009] Further, the lifting frame comprises a plurality of supporting rods, a bottom frame and a top frame fixedly connected with the supporting rods. The bottom frame is connected with the supporting rods and located at the bottom of the supporting rods, and the transformer body is arranged on the bottom frame. The top frame is connected with the supporting rods and located at the top of the supporting rods, and the cover is connected with the top frame. A sliding mechanism is arranged between each supporting rod and the inner wall of the box body, so that the lifting frame can move up and down relative to the box body.

[0010] Further, the sliding mechanism includes a convex strip provided on each of the support rods and a groove provided on the inner wall of the box body corresponding to each of the convex strips, and each of the convex strips is located in the corresponding groove; or, the sliding mechanism includes a groove provided on each of the support rods and a convex strip provided on the inner wall of the box body corresponding to each of the grooves, and each of the convex strips is located in the corresponding groove.

[0011] Furthermore, the lifting frame also includes an intermediate frame, which is fixedly connected to the multiple support rods and located between the bottom frame and the top frame. Support mechanisms for being erected on the top of the side walls of the box are symmetrically provided on opposite sides of at least one of the intermediate frame and the bottom frame.

[0012] Furthermore, each of the support mechanisms includes a support plate, at least one guide rod and at least one spring, wherein one end of each guide rod is fixed to the corresponding outer wall of one side of the intermediate frame or the bottom frame, and the other end extends into a positioning hole provided on the first side wall of the support plate; each of the springs is sleeved on the corresponding first guide rod, and one end of the spring is fixed to the outer wall of the corresponding intermediate frame or the bottom frame, and the other end of the spring is fixed to the first side wall of the support plate; the bottom of the support plate is provided with a limiting groove for the top of the side wall of the box to be clamped therein, wherein when the second side wall of the support plate opposite to the first side wall abuts against the inner wall of the side wall of the box, the spring is in a compressed state; when the top of the side wall of the box is clamped in the limiting groove of the support plate, the spring is in a normal state.

[0013] Furthermore, the top of the side wall of the box body is provided with an opening corresponding to the support plate. When the top of the side wall of the box body is clamped in the limiting groove of the support plate, the support plate is located in the corresponding opening.

[0014] Furthermore, the cover is detachably connected to the top frame of the lifting frame.

[0015] Furthermore, the top frame includes two first side arms arranged opposite to each other and two second side arms arranged opposite to each other, the two second side arms are connected between the two first side arms, and the distance between the two second side arms gradually decreases from the two end portions to the middle portion; the cover body includes a connecting mechanism, and the connecting mechanism includes a rotation control member, a connecting shaft, a connecting plate and two limit plates, wherein the rotation control member is located on the outer surface of the top wall of the cover body, the connecting plate is fixed to the inner surface of the top wall of the cover body, the first end of the connecting shaft is fixed to the rotation control member, and the second end of the connecting shaft passes through the top wall and the connecting plate in sequence and is limited to the lower part of the connecting plate. The two limit plates are rotatably arranged on the lower surface of the connecting plate, and the middle parts of the two limit plates are pivotally connected to the two end parts of the connecting plate, and the two ends of each limit plate are connected to the second end of the connecting shaft through a traction line; the connecting plate is located between the middle parts of the two second side arms, and the two limit plates are respectively in contact with the lower surfaces of the two second side arms, and the connecting plate and the two limit plates are in an I-shape, and the two limit plates can enter the gap between the two second side arms as the connecting shaft rotates.

[0016] Furthermore, the cover body further includes a handle, and the handle is arranged on the outer surface of the top wall of the cover body.

[0017] Furthermore, the underground transformer also includes a heat dissipation rack and a radiator. The radiator is arranged in the box and located at the bottom of the box. The heat dissipation rack is mounted in the lifting frame, and the transformer body is mounted on the heat dissipation rack.

[0018] The implementation of the embodiment of the present invention has the following beneficial effects: the underground transformer of the embodiment of the present invention connects the cover body to the top of the lifting frame provided with the transformer body. When the underground transformer is buried underground, the lifting frame together with the transformer body can be pulled out from the underground and moved to the ground by lifting and moving the cover body from the outside, so as to facilitate the inspection and maintenance of the transformer body. When the lifting frame together with the transformer body needs to be placed back into the box, it can also be conveniently achieved by driving the cover body from the outside. Therefore, the underground transformer of the embodiment of the present invention does not need to be internally provided with an electric mechanism to realize the lifting and lowering of the transformer body in the underground transformer, avoiding the situation in which the electric mechanism and its transmission structure in the existing underground transformer are prone to failure and affect the lifting and lowering of the transformer body; at the same time, the underground transformer of the embodiment of the present invention does not need to be provided with an electric mechanism for assisting the lifting of the transformer body, and there is no need for personnel to go underground to inspect the transformer body. The structure is compact, saves space and materials, and realizes the miniaturization of the underground transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 The figure is a schematic cross-sectional structural diagram of an underground transformer according to an embodiment of the present invention.

[0021] Figure 2 for Figure 1 The structural diagram of the underground transformer in the figure removes the cover but retains the connection mechanism.

[0022] Figure 3 for Figure 2 Schematic diagram of the structure of the underground transformer after removing the box and radiator.

[0023] Figure 4 for Figure 3 A magnified schematic diagram of point A in FIG.

[0024] Figure 5 The figure is a schematic cross-sectional structural diagram of a box body of an underground transformer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following descriptions of the embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention may be implemented.

[0026] like Figure 1 As shown, an embodiment of the present invention provides an underground transformer, comprising an embedded box 10 and a transformer body 20 disposed in the embedded box 10. The embedded box 10 comprises a box body 11 with an upper opening, a lifting frame 12, and a cover 13. The cover 13 is disposed on the box body 11, forming a receiving space 14 between the cover 13 and the box body 11. The lifting frame 12 is located in the receiving space 14, and the cover 13 is connected to the top of the lifting frame 12, so that the lifting frame 12 can move up and down relative to the box body 11 along with the cover 13. The transformer body 20 is mounted in the lifting frame 12.

[0027] Since the cover 13 of the embodiment of the present invention is connected to the top of the lifting frame 12, the lifting frame 12 can move up and down relative to the box body 11 along with the cover 13. Therefore, when the embedded box 10 is buried underground, it is only necessary to pull the cover 13 upward from the outside and pull it out from the ground to remove the lifting frame 12 together with the transformer body 20 arranged in the lifting frame 12 from the box body 11, so as to facilitate the maintenance of the transformer body 20. In order to clearly present the internal structure of the buried transformer, Figure 1 The underground transformer in the embodiment has the front wall of the box body 11 and the front wall of the cover body 13 removed.

[0028] In one embodiment, the box body 11 is a cuboid with a rectangular cross-section, but is not limited thereto. The box body 11 may also have other cross-sectional shapes as needed.

[0029] The lifting frame 12 may include a plurality of support rods 120 and a bottom frame 121 and a top frame 122 fixedly connected to the plurality of support rods 120. The bottom frame 121 is connected to the plurality of support rods 120 and is located at the bottom of the plurality of support rods 120, and the top frame 122 is connected to the plurality of support rods 120 and is located at the top of the plurality of support rods 120. The plurality of support rods 120, the bottom frame 121 and the top frame 122 constitute the basic framework of the lifting frame 12. The transformer body 20 is mounted on the bottom frame 121. The cover body 13 is connected to the top frame 122. A sliding mechanism is provided between each of the support rods 120 and the inner wall of the box body 11, so that the lifting frame 12 can move up and down relative to the box body 11.

[0030] Specifically, since the box body 11 in this embodiment is a rectangular parallelepiped, the overall frame of the lifting frame 12 is rectangular parallelepiped, and the multiple support rods 120 can be optionally 4, but not limited to this. In order to make the lifting frame 12 more stable, a larger number of support rods 120 can also be set.

[0031] The sliding mechanism may include a ridge provided on each of the support rods 120 and a groove provided on the inner wall of the box body 11 corresponding to each of the ridges, wherein each of the ridges is located in the corresponding groove, wherein the ridges can slide in the grooves. Alternatively, the sliding mechanism may also include a groove provided on each of the support rods 120 and a ridge provided on the inner wall of the box body 11 corresponding to each of the grooves, wherein each of the ridges is located in the corresponding groove, wherein the grooves can slide along the ridges. By setting up the sliding mechanism, the lifting frame 12 of the embodiment of the present invention can be confined in the box body 11, and can slide up and down relative to the box body 11 and be removed from the box body 11.

[0032] like Figure 1-Figure 5In the embodiment shown, the sliding mechanism includes a ridge 1200 provided on each of the support rods 120 and a groove 110 provided on the inner wall of the box body 11 corresponding to each of the ridges 1200. Each of the ridges 1200 is located in the corresponding groove 110 and can slide up and down in the groove 110.

[0033] The base frame 121 is disposed at the bottom of the plurality of support rods 120, and the transformer body 20 can be mounted thereon. In one embodiment, the underground transformer of the present invention can further include a heat dissipation rack 30, which is mounted in the lifting frame 12, specifically mounted on the base frame 121. The transformer body 20 is mounted on the heat dissipation rack 30, and heat dissipation is accelerated by the heat dissipation rack 30.

[0034] Furthermore, the lifting frame 12 may further include an intermediate frame 123, which is fixedly connected to the plurality of support rods 120 and positioned between the bottom frame 121 and the top frame 122. The terminals 21 of the transformer body 20 may pass through the intermediate frame 123 and be positioned above the intermediate frame 123. In one embodiment, to stably secure the transformer body 20 within the lifting frame 12, a mounting plate 1230 is provided between the transformer body 20 and the intermediate frame 123. The mounting plate 1230 securely connects the transformer body 20 to the intermediate frame 123. Preferably, one side of the mounting plate 1230 may be fixedly connected to the fixing plate 22 on the transformer body 20 for mounting the terminals 21, and the other side may be fixedly connected to the upper surface of the intermediate frame 123. The connection method may be, for example, threaded connection. Furthermore, there may be a plurality of mounting plates 1230 , which are respectively disposed around the fixing plate 22 of the transformer body 20 and between the four side arms of the intermediate frame 123 .

[0035] The two opposite sides of the intermediate frame 123 can be symmetrically provided with support mechanisms 1231 for being erected on the top of the side wall of the box body 11. Preferably, the support mechanism 1231 is an automatically retractable support mechanism. When the lifting frame 12 rises to an appropriate position, the support mechanism 1231 can automatically pop out and be erected on the top of the side wall of the box body 11. Specifically, Figure 3 and Figure 4As shown, each support mechanism 1231 includes a support plate 1232, at least one guide rod 1233, and at least one spring 1234. One end of each guide rod 1233 is fixed to an outer wall of the intermediate frame 123, and the other end can extend into a positioning hole provided in the first side wall of the support plate 1232. Each spring 1234 is sleeved on the corresponding first guide rod 1233, with one end of each spring 1234 fixed to the outer wall of the intermediate frame 123 and the other end fixed to the first side wall of the support plate 1232. The bottom of the support plate 1232 is provided with a retaining groove 1235 for the top of the side wall of the box to be retained therein.

[0036] When the lifting frame 12 is placed on the bottom surface of the box body 11, the second side wall on the support plate 1232 opposite to the first side wall abuts against the inner wall of the side wall of the box body 11, and the spring 1234 is in a compressed state. As the lifting frame 12 is lifted, when the intermediate frame 123 is higher than the top of the box body 11, the side wall of the box body 11 no longer abuts against the support plate 1232. Under the elastic force of the spring 1234, the support plate 1232 is able to be located above the side wall of the box body 11. At this time, if the lifting frame 12 is lowered, the top of the side wall of the box body 11 can be stuck in the limiting groove 1235 of the support plate 1232, and the spring 1234 is in a normal state. Figure 2 As shown, the lifting frame 12 is supported and positioned in the box body 11 by the cooperation between the support plate 1232 and the box body 11 , and the lifting frame 12 maintains an appropriate distance from the bottom surface of the box body 11 .

[0037] In this embodiment, when the underground transformer is operating normally, the cover 13 is placed on the box body 11, and the lifting frame 12 is located in the receiving space formed by the cover 13 and the box body 11. The support plate 1232 of the intermediate frame 123 is maintained on the side wall of the box body 11, so that the lifting frame 12 maintains an appropriate distance from the bottom surface of the box body 11, thereby maintaining a larger heat dissipation space below the transformer body 20, which is beneficial to the heat dissipation of the transformer body 20; when maintenance is required, it is also convenient to directly repair the terminal 21 of the transformer body 20 by removing the cover body 13 without removing the entire lifting frame 12. This will be further explained below.

[0038] Of course, the present invention is not limited to the above-mentioned embodiments. In other embodiments, by adjusting the length of the support rod 120 and the position of the intermediate frame 123 or adjusting the structure of the cover body 13, when the underground transformer is operating normally, the lifting frame 12 is placed on the bottom surface of the box body 11, the support plate 1232 of the intermediate frame 123 is in contact with the inner wall of the side wall of the box body 11, and the spring 1234 is in a compressed state; when necessary, by lifting the cover body 13 and the lifting frame 12, the support plate 1232 of the intermediate frame 123 can be erected on the side wall of the box body 11.

[0039] exist Figure 2 and Figure 3 In the illustrated embodiment, the intermediate frame 123 is provided with a support mechanism 1231 on each of its left and right arms, and each support mechanism 1231 includes a support plate 1232, two guide rods 1233, and two corresponding springs 1234. In other embodiments, this arrangement is not limited to the above. For example, the intermediate frame 123 may be provided with support mechanisms 1231 on all four side arms. The number of guide rods 1233 and corresponding springs 1234 in each support mechanism 1231 is also not limited to two sets, and may be more sets, or, if the elasticity and support force are sufficient, may be a single set.

[0040] As a preferred embodiment, the base frame 121 can also be symmetrically provided with support mechanisms 1211 on opposite sides thereof for being mounted on the top of the side walls of the box body 11, such as Figure 3As shown. The support mechanism 1211 of the bottom frame 121 and the support mechanism 1231 of the intermediate frame 123 have the same structure and configuration, so they will not be described in detail here. The function of the support mechanism 1211 is the same as that of the support mechanism 1231, namely, to position and support the lifting frame 12 within the box 11. Specifically, when the bottom frame 121 is located within the box 11, the support plate of the support mechanism 1211 abuts against the inner wall of the side wall of the box 11, and the springs of the support mechanism 1211 are all in a compressed state. As the lifting frame 12 is raised, when the base frame 121 is higher than the top of the box 11, the side wall of the box 11 no longer abuts the support plate of the support mechanism 1211. Under the elastic force of the spring of the support mechanism 1211, the support plate of the support mechanism 1211 is positioned above the side wall of the box 11. At this time, if the lifting frame 12 is lowered, the top of the side wall of the box 11 can be locked in the retaining groove of the support plate of the support mechanism 1211, thereby supporting the lifting frame 12 in the box 11 and the spring is in a normal state. In this state, the transformer body 20 located in the lifting frame 12 can be completely exposed from the box 11, and the box 11 supports the lifting frame 12, so that the transformer body 20 can be repaired without moving the transformer body 20 to the ground.

[0041] Furthermore, in a preferred embodiment, the top of the side wall of the box body 11 is provided with an opening 111, corresponding to the support plate 1232 of the support mechanism 1231 and the support plate of the support mechanism 1211. Figure 5 When the top of the side wall of the box body 11 is clamped in the limiting groove 1235 of the support mechanism 1231 or the limiting groove of the support mechanism 1211, the support plate 1232 of the support mechanism 1231 or the support plate of the support mechanism 1211 is located in the corresponding opening 111, as shown. Figure 2 In this way, by engaging the limiting groove with the side wall of the box body 11 and the opening 111 with the support plate, the lifting frame 12 can be more firmly positioned on the box body 11, thereby improving the stability of the lifting frame 12 and the transformer body 20.

[0042] The cover 13 of the underground transformer in this embodiment of the present invention is connected to the top of the lifting frame 12, allowing the lifting frame 12 to move up and down relative to the box body 11 along with the cover 13. In practice, the cover 13 can be non-detachably connected to the top frame 122 of the lifting frame 12, or detachably connected to the top frame 122 of the lifting frame 12. Preferably, the cover 13 is detachably connected to the top frame 122 of the lifting frame 12, allowing the cover 13 to be removed when servicing the transformer body 20, facilitating maintenance work.

[0043] Specifically, the cover 13 includes a connecting mechanism 130, and the cover 13 is detachably connected to the top frame 122 of the lifting frame 12 through the connecting mechanism 130. As a preferred embodiment, Figure 1-Figure 3 (In order to clearly show the connection relationship between the connecting mechanism 130 and the top frame 122, Figure 2 and Figure 3 As shown in the figure (where the other parts of the cover 13 are removed and only the connecting mechanism 130 is retained), the connecting mechanism 130 may include a rotation control member 131, a connecting shaft 132, a connecting plate 133 and two limit plates 134. The rotation control member 131 is located on the outer surface of the top wall 135 of the cover 13, and the connecting plate 133 is fixed to the inner surface of the top wall 135 of the cover 13. The connecting shaft 132 connects the rotation control member 131 with the cover 13 and the connecting plate 133. Specifically, the first end of the connecting shaft 132 is fixed to the rotation control member 131, and the second end of the connecting shaft 132 passes through the top wall 135 of the cover 13 and the connecting plate 133 in sequence and is limited to the lower surface of the connecting plate 133. The connecting shaft 132 can rotate relative to the top wall 135 and the connecting plate 133 as the rotation control member 131 rotates. The two limiting plates 134 are rotatably mounted on the lower surface of the connecting plate 133. The middle portions of the two limiting plates 134 are pivotally connected to the respective ends of the connecting plate 133. In one embodiment, the middle portions of the two limiting plates 134 are riveted to the respective ends of the connecting plate 133. Both ends of each limiting plate 134 are connected to the second end of the connecting shaft 132 via a pull line (not shown). Rotation of the connecting shaft 132 drives the two limiting plates 134 to rotate relative to the connecting plate 133.

[0044] The top frame 122 of the lifting frame 12 can include two opposing first side arms 1221 and two opposing second side arms 1222, with the two second side arms 1222 connected between the two first side arms 1221. To cooperate with the connecting mechanism 130, the distance between the two second side arms 1222 of the top frame 122 gradually decreases from the ends to the middle. When the cover 13 is placed on the lifting frame 12, the connecting plate 133 of the cover 13 is located between the middle portions of the two second side arms 1222 of the top frame 122. The two limiting plates 134 can respectively abut the lower surfaces of the two second side walls 122. The connecting plate 133 and the limiting plates 134 at its ends form a generally I-shaped structure. In this manner, the cover 13 is connected to the top frame 122 of the lifting frame 12, preventing the cover 13 from detaching from the lifting frame 12, allowing the lifting frame 12 to move up and down with the cover 13.

[0045] To remove the cover 13 from the lifting frame 12 , the user only needs to rotate the rotation control member 131 . The connecting shaft 132 rotates along with the rotation control member 131 and drives the two limit plates 134 to rotate via the traction line. When the two limit plates 134 rotate to enter the gap between the two second side arms 1222 , the cover 13 can be removed from the top frame 122 of the lifting frame 12 .

[0046] In one embodiment, the rotation control member 131 is a rotating handle.

[0047] Through the above arrangement, a detachable connection is formed between the cover 13 and the lifting frame 12. When the cover 13 is connected to the lifting frame 12, the cover 13 can drive the lifting frame 12 to move up and down. When the cover 13 is removed, the transformer body 20 in the lifting frame 12 is exposed to the outside, making it convenient to inspect and repair the transformer body 20.

[0048] Furthermore, the cover body 13 also includes a handle 136 , which is provided on the outer surface of the top wall 135 of the cover body 13 , so that the cover body 13 and the lifting frame 12 can be lifted and moved by manpower or lifting equipment through the handle 136 .

[0049] Furthermore, the underground transformer further includes a radiator 40 , which is disposed in the box 11 and located at the bottom of the box 11 to accelerate heat dissipation of the transformer body 20 .

[0050] From the above description, it can be seen that the underground transformer of the embodiment of the present invention connects the cover body to the top of the lifting frame provided with the transformer body. When the underground transformer is buried underground, the lifting frame and the transformer body can be pulled out from the underground and moved to the ground by lifting and moving the cover body from the outside, so as to facilitate the maintenance of the transformer body. When the lifting frame and the transformer body need to be placed back into the box, it can also be conveniently achieved by driving the cover body from the outside. Therefore, it can be seen that the underground transformer of the embodiment of the present invention can achieve the lifting and lowering of the transformer body in the underground transformer without the need for an internal electric mechanism, thus avoiding the situation in which the electric mechanism and its transmission structure in the existing underground transformer are prone to failure and affect the lifting and lowering of the transformer body. At the same time, the underground transformer of the embodiment of the present invention does not need to be provided with an electric mechanism to assist in the lifting of the transformer body, and there is no need for personnel to go underground to maintain the transformer body. The structure is compact, saves space and materials, and realizes the miniaturization of the underground transformer.

[0051] Moreover, the cover of the underground transformer in the embodiment of the present invention can be detachably connected to the top of the lifting frame. When the cover is connected to the lifting frame, the cover can drive the lifting frame to rise and fall; when the cover is removed, it is beneficial to expose the transformer body in the lifting frame to the outside, making it convenient to inspect and repair the transformer body.

[0052] In addition, the underground transformer of the embodiment of the present invention is also provided with a support mechanism on the intermediate frame and / or the bottom frame of its lifting frame. As the lifting frame rises, different positions of the lifting frame can be stably mounted on the top of the side wall of the box. When the support mechanism on the intermediate frame is mounted on the side wall of the box, the upper part of the transformer body, such as the terminal, can be exposed to the outside by removing the cover, making it convenient to inspect and repair the exposed part. When the support mechanism on the bottom frame is mounted on the side wall of the box, the entire transformer body can be exposed to the outside by removing the cover, making it convenient to inspect, disassemble, and install the entire transformer body. In this way, by providing the support mechanism, there is no need to remove the lifting frame from the box and move it to the ground, that is, it is possible to conveniently carry out targeted inspections on part or all of the transformer body, saving time and effort.

[0053] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An underground transformer, comprising a pre-buried box and a transformer body arranged in the pre-buried box, characterized in that: The embedded box includes a box body with an upper opening, a lifting frame, and a cover body. The cover body is installed on the box body, and a receiving space is formed between the cover body and the box body. The lifting frame is located in the receiving space, and the cover body is connected to the top of the lifting frame so that the lifting frame can move up and down relative to the box body along with the cover body. The transformer body is installed in the lifting frame. The lifting frame includes a plurality of support rods and a bottom frame and a top frame fixedly connected to the plurality of support rods, wherein the bottom frame is connected to the plurality of support rods and is located at the bottom of the plurality of support rods, and the transformer body is mounted on the bottom frame; the top frame is connected to the plurality of support rods and is located at the top of the plurality of support rods, and the cover body is connected to the top frame; a sliding mechanism is provided between each of the support rods and the inner wall of the box body, so that the lifting frame can move up and down relative to the box body; The lifting frame further includes an intermediate frame fixedly connected to the plurality of support rods and located between the bottom frame and the top frame, and support mechanisms for being mounted on the top of the side walls of the box body are symmetrically provided on opposite sides of at least one of the intermediate frame and the bottom frame; 14. The repairing kit for automotive dents, according to claim 13, wherein the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The through-hole comprises a first end, a second end, and a second end. The bosses comprise a through-hole, a second end, and a second end. The bosses comprise a through-hole, a second end, and a second end. The cover body is detachably connected to the top frame of the lifting frame.

2. The underground transformer according to claim 1, characterized in that: The sliding mechanism includes a convex strip provided on each of the support rods and a groove provided on the inner wall of the box body corresponding to each of the convex strips, and each of the convex strips is located in the corresponding groove; or, the sliding mechanism includes a groove provided on each of the support rods and a convex strip provided on the inner wall of the box body corresponding to each of the grooves, and each of the convex strips is located in the corresponding groove.

3. The underground transformer according to claim 1, characterized in that: The top of the side wall of the box body is provided with an opening corresponding to the support plate. When the top of the side wall of the box body is clamped in the limiting groove of the support plate, the support plate is located in the corresponding opening.

4. The underground transformer according to claim 1, characterized in that: The top frame includes two first side arms arranged opposite to each other and two second side arms arranged opposite to each other, the two second side arms are connected between the two first side arms, and the distance between the two second side arms gradually decreases from the two ends to the middle part; the cover body includes a connecting mechanism, which includes a rotation control member, a connecting shaft, a connecting plate and two limit plates, wherein the rotation control member is located on the outer surface of the top wall of the cover body, the connecting plate is fixed to the inner surface of the top wall of the cover body, the first end of the connecting shaft is fixed to the rotation control member, and the second end of the connecting shaft passes through the top wall and the connecting plate in sequence and is limited to the lower surface of the connecting plate. The two limit switches are connected to each other with a plurality of link plates at the bottom end of the connecting plate, and the two limit switches are connected to each other with a plurality of link plates at the bottom end of the connecting plate.

5. The underground transformer according to claim 1, characterized in that: The cover body further includes a handle, which is arranged on the outer surface of the top wall of the cover body.

6. The underground transformer according to claim 1, characterized in that: The underground transformer further includes a heat dissipation frame and a radiator. The radiator is arranged in the box and located at the bottom of the box. The heat dissipation frame is mounted in the lifting frame, and the transformer body is mounted on the heat dissipation frame.

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