Dry-type transformer

Abstract

The utility model discloses a dry-type transformer, which comprises a cabinet with a cabinet doorway on the front surface and a side doorway on the side surface; the voltage transformation module comprises two mounting frames and a plurality of voltage transformation units, the two mounting frames are vertically arranged at intervals, the two mounting frames are fixedly connected in the cabinet, the two mounting frames are provided with sliding grooves, the two sliding grooves jointly form a sliding way, the sliding way is provided with a notch right opposite to the side door opening, and the two sliding grooves are provided with a plurality of long circular holes; the upper end face and the lower end face of each transformation unit are elastically connected with long circular truncated cones, the size of the long circular truncated cones is consistent with the size of the long circular holes, the width of the sliding grooves is larger than that of the long circular truncated cones, and the transformation units are slidably connected to the sliding ways through the long circular truncated cones. In addition, the cabinet does not need to be provided with a cabinet door larger than the voltage transformation module, so that the size of the cabinet can be further reduced, the voltage transformation unit is very convenient to disassemble and assemble, and subsequent maintenance and repair are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment, in particular to a dry-type transformer. Background Art

[0002] Dry-type transformers are transformers that do not use liquid coolants, primarily using air as the cooling medium. Compared to traditional oil-immersed transformers, these transformers offer numerous advantages and are widely used in power distribution systems in various fields, including power substations, industrial and mining enterprises, and residential communities.

[0003] The main components of a dry-type transformer include main wiring, high- and low-voltage windings, an iron core, and insulation. The main wiring is typically made of high-purity copper or aluminum, capable of withstanding high temperatures and currents. The high- and low-voltage windings are wound using specialized materials to ensure the transformer's insulation performance. The iron core, which conducts magnetic flux and supports the windings, is typically constructed from laminated silicon steel sheets, resulting in low magnetic resistance and loss. The insulation is a crucial component of a dry-type transformer, effectively isolating the high- and low-voltage windings and ensuring proper operation.

[0004] The operating principle of a dry-type transformer is essentially the same as that of a traditional transformer, using electromagnetic induction to increase or decrease voltage. When the frequency and signal of the input voltage change, the transformer will increase or decrease the voltage due to the different conversion rates of the windings.

[0005] The transformer modules of existing dry-type transformers are assembled outside the cabinet. Once fully assembled, they are then installed inside the cabinet through the cabinet door. This requires the door to be larger than the transformer modules, preventing further reduction in the cabinet size. Furthermore, each transformer unit is secured with screws and nuts, with some screws facing away from the door. This requires workers to lean over to access the cabinet from behind to install and remove the transformer units, hindering subsequent maintenance and repair. Utility Model Content

[0006] The utility model aims to provide a dry-type transformer to solve the technical problems existing in the prior art.

[0007] According to the dry-type transformer of the first embodiment of the present utility model, it includes:

[0008] A cabinet having a cabinet door on the front and a side door on the side of the cabinet;

[0009] The transformer module includes two mounting frames and multiple transformer units. The two mounting frames are spaced apart in an upper and lower manner. Both mounting frames are fixedly connected to the cabinet. Both mounting frames are provided with slide grooves. The two slide grooves together form a slideway. The slideway is provided with a notch facing the side door. Both slide grooves are provided with multiple oblong holes. The upper and lower end faces of each transformer unit are elastically connected with an oblong table. The size of the oblong table is consistent with the size of the oblong hole. The width of the slide groove is greater than the width of the oblong table. The transformer unit is slidably connected to the slideway through the oblong table.

[0010] The dry-type transformer according to the embodiment of the present invention has at least the following beneficial effects: the two mounting frames are fixedly connected in advance in the cabinet. When the transformer unit needs to be assembled, the multiple transformer units are first slid into the slide one by one from the side door. At this time, the transformer unit is slidably connected to the slide groove through the oblong table. During the sliding, it is necessary to ensure that there is a certain rotation angle between the oblong table and the oblong hole. After the transformer unit slides to the preset position, the worker rotates the transformer unit to rotate the oblong table of the transformer unit to be opposite to the corresponding oblong hole. The oblong table is clamped with the oblong hole under the action of elastic force, thereby limiting the relative position of the transformer unit in the cabinet; since the cabinet does not need to be provided with a cabinet door larger than the transformer module, the volume of the cabinet can be further reduced, and the disassembly and assembly of the transformer unit is also very convenient, which is beneficial to subsequent maintenance and repair.

[0011] According to some embodiments of the present invention, both chutes are provided with an inclined surface at one end near the side door, giving the chutes a bell-shaped opening. Because the transformer unit is provided with retractable oblong platforms at both its upper and lower ends, the overall height of the transformer unit is variable. With the inclined surfaces, workers can simply insert the transformer unit into the slots of the chutes and push it deeper into the chutes. The inclined surfaces automatically compress the oblong platforms back into place, eliminating the need for manual pressing.

[0012] According to some embodiments of the present invention, the oblong hole and the chute have the same length direction. Under the premise of limiting the length direction of the oblong hole, the transformer unit needs to ensure that there is a certain rotation angle between the oblong table and the oblong hole when entering the chute.

[0013] According to some embodiments of the present invention, in order to facilitate the arrangement of the oblong platform, the upper end and the lower end of the transformer unit are respectively connected to an upper cover and a lower cover, and both the upper cover and the lower cover are elastically connected to the oblong platform.

[0014] According to some embodiments of the present invention, in order to achieve a fixed connection between two mounting brackets, the mounting bracket located at the bottom is connected to a pad, which is installed on the cabinet; the mounting bracket located at the top is connected to a fixing bar, which is installed on the cabinet.

[0015] According to some embodiments of the present utility model, the fixing strip and the cabinet have an adjustable structure that can be adjusted up and down to adapt to voltage conversion units of different heights.

[0016] According to some embodiments of the present utility model, in order to achieve electrical connection between multiple voltage conversion units, each voltage conversion unit is provided with a plurality of secondary terminals, and the secondary terminals of any one voltage conversion unit are connected to the secondary terminals of another voltage conversion unit through wires.

[0017] According to some embodiments of the present utility model, in order to achieve electrical connection with the mains power, the upper mounting frame is connected with a plurality of main terminals, and any one main terminal is used to connect the live wire or the neutral wire.

[0018] According to some embodiments of the present utility model, in order to facilitate rotation of the voltage conversion unit, a handle is connected to the outer vertical wall of the voltage conversion unit.

[0019] According to some embodiments of the present utility model, in order to avoid interference, the handles of two adjacent voltage conversion units are arranged in a staggered manner in the up and down direction.

[0020] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0022] Figure 1 is a three-dimensional structural schematic diagram of a dry-type transformer provided by an embodiment of the present utility model during assembly;

[0023] Figure 2 is a three-dimensional structural schematic diagram of a voltage conversion module provided by an embodiment of the present utility model during assembly;

[0024] Figure 3 is another three-dimensional structural schematic diagram of a voltage conversion module provided by an embodiment of the present utility model during assembly;

[0025] Figure 4 is Figure 2 a top view of the voltage conversion module shown;

[0026] Figure 5 is a three-dimensional structural schematic diagram of a cabinet provided by an embodiment of the present utility model;

[0027] Figure 6 is a front view of the dry-type transformer provided by an embodiment of the present utility model after completion of assembly;

[0028] Figure 7 It is a three-dimensional structural schematic diagram of the voltage transformation module provided by the embodiment of the present utility model after assembly.

[0029] In the attached drawings: 100 - cabinet, 20 - voltage transformation module, 110 - inner cavity, 120 - cabinet door opening, 121 - front door, 130 - side door opening, 131 - side door, 200 - voltage transformation unit, 400 - upper mounting bracket, 500 - lower mounting bracket, 510 - cushion strip, 410 - fixing strip, 411 - mounting plate, 520 - lower sliding groove, 420 - upper sliding groove, 401 - slideway, 402 - notch, 403 - oblong hole, 210 - protective housing, 220 - upper cover, 230 - lower cover, 240 - long frustum, 404 - inclined plane, 250 - secondary terminal, 251 - wire, 430 - main terminal, 260 - handle. Specific embodiments

[0030] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the attached drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the attached drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0032] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0033] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0034] Such as Figures 1 to 5As shown, the dry-type transformer according to the embodiment of the first aspect of the present utility model includes a cabinet 100 and a voltage transformation module 20. The outer shape of the cabinet 100 is a rectangular body, which has an inner cavity 110. A cabinet door opening 120 is provided on the front of the cabinet 100. Two front doors 121 are hinged on both sides of the cabinet door opening 120. When the two front doors 121 rotate to close the cabinet door opening 120, the inner cavity 110 of the cabinet 100 is not communicated with the external environment; when the two front doors 121 rotate to open the cabinet door opening 120, the inner cavity 110 of the cabinet 100 is communicated with the external environment. In addition, a side door opening 130 is provided on one side of the cabinet 100. A side door 131 is hinged on one side of the side door opening 130. When the side door 131 rotates to close the side door opening 130, the inner cavity 110 of the cabinet 100 is not communicated with the external environment; when the side door 131 rotates to open the side door opening 130, the inner cavity 110 of the cabinet 100 is communicated with the external environment.

[0035] In addition, the voltage transformation module 20 includes two mounting brackets and a plurality of voltage transformation units 200. The two mounting brackets are arranged in the inner cavity 110 of the cabinet 100 at an interval in the up-and-down direction. For the convenience of the following description, the two mounting brackets are respectively defined as an upper mounting bracket 400 and a lower mounting bracket 500 according to their mounting positions. In the technical field, the number of voltage transformation units 200 is generally three, and the three voltage transformation units 200 are all arranged between the upper mounting bracket 400 and the lower mounting bracket 500.

[0036] Specifically, the extending direction of the lower mounting bracket 500 is consistent with the extending direction of the upper mounting bracket 400, and the two are arranged directly opposite to each other in the up-and-down direction. Two cushion strips 510 are connected to the bottom of the lower mounting bracket 500. The extending direction of the cushion strips 510 is orthogonal to the extending direction of the lower mounting bracket 500. In addition to being able to lift the lower mounting bracket 500, the two cushion strips 510 can also be fixedly connected to the inner bottom surface of the cabinet 100 by screws to limit the relative position between the lower mounting bracket 500 and the cabinet 100. Correspondingly, two fixing strips 410 are connected to the top of the upper mounting bracket 400. The extending direction of the fixing strips 410 is orthogonal to the extending direction of the upper mounting bracket 400. Installation plates 411 are provided at both ends of each fixing strip 410. The installation plates 411 are fixedly connected to the inner side wall of the cabinet 100 by screws to limit the relative position between the upper mounting bracket 400 and the cabinet 100, thereby limiting the relative position between the upper mounting bracket 400 and the lower mounting bracket 500.

[0037] The lower mounting bracket 500 is provided with a lower sliding groove 520 along its length direction, and the upper mounting bracket 400 is provided with an upper sliding groove 420 along its length direction. The lower sliding groove 520 and the upper sliding groove 420 are arranged vertically opposite to each other, and they jointly form a sliding track 401. The sliding track 401 is provided with a notch 402 facing the side door opening 130. Since the relative position between the upper mounting bracket 400 and the lower mounting bracket 500 is limited, the size of the sliding track 401 is also limited. Each sliding groove is provided with three oblong holes 403 at intervals along its length direction. In this embodiment, the oblong holes 403 and the corresponding sliding grooves have the same length direction, that is to say, the oblong holes 403 extend along the length direction of the corresponding sliding grooves.

[0038] In addition, each voltage transformation unit 200 includes a winding, an iron core, an insulating layer, and a protective housing 210. The winding and the iron core are both assembled in the insulating layer, the iron core is surrounded by the winding, and the insulating layer is fixed in the protective housing 210 by injecting glue. Since the present utility model does not propose improvements to the voltage transformation unit 200, the voltage transformation unit 200 can follow the existing technology. Therefore, the present utility model does not describe its specific structure and working principle in detail. Since the voltage transformation unit 200 follows the existing technology, in order not to change the structure of the existing technology, an upper cover 220 and a lower cover 230 need to be respectively connected to the upper end and the lower end of the voltage transformation unit 200. The upper cover 220 and the lower cover 230 are both provided with oblong grooves. Each groove is connected with an oblong platform 240 through a spring, and the spring has an elastic tendency away from the groove, so that the upper end surface and the lower end surface of each voltage transformation unit 200 are elastically connected with an oblong platform 240. In this embodiment, the size of the oblong platform 240 is the same as the size of the oblong hole 403, so that the oblong platform 240 can be embedded into the oblong hole 403.

[0039] Each voltage transformation unit 200 is slidably connected to the upper sliding groove 420 and the lower sliding groove 520 through the oblong platform 240. In order to enable the voltage transformation unit 200 to be slidably connected to the sliding track 401 arbitrarily, the widths of the two sliding grooves are not less than the length of the oblong platform 240. In this embodiment, the widths of the two sliding grooves are equal to the length of the oblong platform 240. On the premise of defining the length direction of the oblong hole 403, when the voltage transformation unit 200 enters the sliding track 401, it is necessary to ensure that there is a certain rotation angle between the oblong platform 240 and the oblong hole 403. In view of the fact that the width of the sliding groove is equal to the length of the oblong platform 240, the oblong platform 240 can maintain a 90° rotation angle with the oblong hole 403.

[0040] With the above structure, the upper mounting frame 400 and the lower mounting frame 500 are pre-fixed and connected within the cabinet 100. When the transformer units 200 need to be assembled, the three transformer units 200 are first slid one by one into the slideway 401 through the side door 130. Because the upper and lower end surfaces of each transformer unit 200 are elastically connected to an oblong platform 240, when the transformer unit 200 slides into the slideway 401, it is necessary to apply force to press the two oblong platforms 240 of the transformer unit 200 to lower the overall height of the transformer unit 200 so that it can smoothly enter the slideway 401. At this time, the transformer unit 200 is slidably connected to the slideway 401 via the oblong platforms 240.

[0041] During the sliding process, it is necessary to ensure that there is a certain rotation angle between the oblong table 240 and the oblong hole 403. After the transformer unit 200 slides to the preset position, the worker rotates the transformer unit 200 to rotate the oblong table 240 of the transformer unit 200 to be aligned with the corresponding oblong hole 403. The oblong table 240 is engaged with the oblong hole 403 under the action of elastic force, thereby defining the relative position of the transformer unit 200 in the cabinet 100. Figure 6 shown.

[0042] When the transformer unit 200 needs to be disassembled, the worker first needs to press the two oblong platforms 240 of the transformer unit 200 with force, then move the transformer unit 200 away from the preset position, and then rotate the transformer unit 200 to rotate the oblong platform 240 of the transformer unit 200 to deviate from the oblong hole 403, and finally drag the transformer unit 200 toward the side door 130 with force to make the transformer unit 200 disengage from the slide 401.

[0043] Since the cabinet 100 does not need to be provided with a cabinet door 120 larger than the transformer module 20, the volume of the cabinet 100 can be further reduced to reduce the footprint of the dry-type transformer, and the transformer unit 200 is also very convenient to disassemble and assemble, which is beneficial to subsequent maintenance and repair.

[0044] like Figure 2As shown, in some embodiments of the present utility model, both the upper chute 420 and the lower chute 520 are provided with inclined surfaces 404 at one end close to the side door opening 130. The inclined surface 404 of the upper chute 420 gradually rises upward in the direction of the side door opening 130, and the inclined surface 404 of the lower chute 520 gradually descends downward in the direction of the side door opening 130, so that the slideway 401 has a flared opening. Since both the upper and lower ends of the voltage transformation unit 200 are provided with telescopic long frustums 240, the overall height of the voltage transformation unit 200 is variable. After the inclined surface 404 is provided, workers can directly insert the voltage transformation unit 200 into the slot opening 402 of the slideway 401 and push the voltage transformation unit 200 deeper into the slideway 401. At this time, under the action of the inclined surface 404, the long frustum 240 of the voltage transformation unit 200 is automatically compressed and retracted, so as to save the operation of manually pressing the long frustum 240.

[0045] As Figure 3 and Figure 7 As shown, in order to achieve the electrical connection between the three voltage transformation units 200, two secondary terminals 250 are connected to the surface of the protective housing 210 for the windings of each voltage transformation unit 200. The secondary terminal 250 of any one voltage transformation unit 200 is connected to the secondary terminal 250 of another voltage transformation unit 200 through a wire 251. For the sake of description, the three voltage transformation units 200 are respectively defined as the first voltage transformation unit, the second voltage transformation unit, and the third voltage transformation unit. In this embodiment, the two secondary terminals 250 of the first voltage transformation unit are respectively electrically connected to one secondary terminal 250 of the second voltage transformation unit and one secondary terminal 250 of the third voltage transformation unit, and the other secondary terminal 250 of the second voltage transformation unit is electrically connected to the other secondary terminal 250 of the third voltage transformation unit. When the three voltage transformation units 200 are assembled, all their secondary terminals 250 are facing the cabinet door opening 120, so as to facilitate wiring.

[0046] In some embodiments of the present utility model, in order to achieve the electrical connection with the mains power, the upper mounting frame 400 is connected with a plurality of main terminals 430, and all the main terminals 430 face the side of the cabinet 100 where the cabinet door opening 120 is provided. In this embodiment, the number of the main terminals 430 is four, and three of the main terminals 430 are respectively used for connecting to the live wire, and the remaining one main terminal 430 is used for connecting to the neutral wire. At the same time, the windings of the three voltage transformation units 200 all extend outwards with main wiring (not shown in the drawings) to meet the electrical connection between the dry-type transformer and the mains power.

[0047] In some embodiments of the present utility model, for the convenience of rotating the voltage transformation unit 200, two handles 260 are connected to the protective housing 210 of the voltage transformation unit 200. The two handles 260 are distributed along the diameter direction of the protective housing 210, enabling workers to rotate the voltage transformation unit 200 through the two handles 260. It can be understood that the number of handles 260 for each voltage transformation unit 200 can also be one, three, etc., rather than being limited to the above embodiments.

[0048] Furthermore, to avoid interference, the handles 260 of adjacent two voltage transformation units 200 are arranged in a staggered manner in the up and down direction, such that in a compact space, adjacent two voltage transformation units 200 will not be unable to rotate normally due to the interference of the handles 260.

[0049] In some embodiments of the present utility model, in order to adapt to voltage transformation units 200 of different heights, the mounting plate 411 of the fixing strip 410 and the cabinet 100 have an adjustable up and down adjustment structure (not shown in the drawings). This adjustment structure can be optionally a long slot provided on the mounting plate 411 or the cabinet 100, or a combination hole provided on the mounting plate 411 or the cabinet 100. By adjusting the up and down position of the fixing strip 410 in the cabinet 100, the height of the slideway 401 is thus adjusted, such that the height of the slideway 401 can adapt to the height between the upper cover 220 and the lower cover 230 of the voltage transformation unit 200, thereby limiting the degree of freedom of the voltage transformation unit 200 in the up and down direction.

[0050] The above has described the embodiments of the present utility model in detail with reference to the drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the said technical field, various changes can also be made without departing from the gist of the present utility model.

Claims

1. Dry-type transformer, characterized in that, Including: A cabinet (100) with a cabinet door opening (120) provided on its front side, and a side door opening (130) provided on the side of the cabinet (100); A voltage transformation module (20), which includes two mounting brackets and a plurality of voltage transformation units (200). The two mounting brackets are arranged at an interval in the up and down direction. Both of the two mounting brackets are fixedly connected inside the cabinet (100). Both of the two mounting brackets are provided with sliding grooves, and the two sliding grooves together form a slideway (401). The slideway (401) is provided with a notch (402) facing the side door opening (130). Both of the two sliding grooves are provided with a plurality of oblong holes (403). An oblong platform (240) is elastically connected to the upper end face and the lower end face of each voltage transformation unit (200). The size of the oblong platform (240) is consistent with the size of the oblong hole (403). The width of the sliding groove is greater than the width of the oblong platform (240). The voltage transformation unit (200) is slidably connected to the slideway (401) through the oblong platform (240).

2. The dry-type transformer according to claim 1, wherein: Both of the two sliding grooves are provided with an inclined surface (404) at one end close to the side door opening (130), so that the slideway (401) has a flared opening.

3. The dry-type transformer according to claim 1, characterized in that: The oblong hole (403) and the sliding groove have the same length direction.

4. The dry-type transformer according to claim 1, wherein: An upper cover (220) and a lower cover (230) are respectively connected to the upper end and the lower end of the voltage transformation unit (200). The upper cover (220) and the lower cover (230) are both elastically connected with the oblong platform (240).

5. The dry-type transformer according to claim 1, characterized in that: The mounting bracket located below is connected with a cushion strip (510), and the cushion strip (510) is installed on the cabinet (100); the mounting bracket located above is connected with a fixing strip (410), and the fixing strip (410) is installed on the cabinet (100).

6. The dry-type transformer according to claim 5, characterized in that: The fixing strip (410) and the cabinet (100) have an adjustable structure that can be adjusted up and down.

7. The dry-type transformer according to claim 1, characterized in that: Each voltage transformation unit (200) is provided with a plurality of secondary terminals (250), and the secondary terminals (250) of any one voltage transformation unit (200) are connected to the secondary terminals (250) of another voltage transformation unit (200) through a wire (251).

8. The dry-type transformer according to claim 1, wherein: The mounting bracket located above is connected with a plurality of main terminals (430), and any one main terminal (430) is used for connecting a live wire or a neutral wire.

9. The dry-type transformer according to claim 1, characterized in that: A handle (260) is connected to the outer vertical wall of the voltage transformation unit (200).

10. The dry-type transformer according to claim 9, characterized in that: The handles (260) of two adjacent voltage transformation units (200) are arranged in a staggered manner in the up and down direction.

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