Base for dry-type transformer

Abstract

The utility model relates to the technical field of transformer bases, in particular to a base for a dry-type transformer, which comprises a base main body mounted below a transformer main body, the base main body comprises an upper layer part and a lower layer part, the upper layer part is provided with a mounting notch for mounting a fan, and the lower layer part is provided with a lower layer part. The number of the mounting notches is the same as that of the transformer main body windings, the mounting notches and the transformer main body windings are in one-to-one correspondence, side wall air inlets communicated with the inner wall of the lower layer part are formed in the side wall of the lower layer part, and air is allowed to enter the inner space of the lower layer part from the external environment through the side wall air inlets; the fan is arranged on the base body and located at the bottom of the winding, when the fan blows air upwards from the bottom, heat at the bottom can be taken away preferentially, airflow can naturally diffuse towards the periphery in the rising process and flow upwards along the side wall of the winding, more chance of contact with the side wall of the winding is achieved, and the heat dissipation efficiency of the winding is improved. Therefore, more uniform air blowing cooling on the winding is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer base technical field especially is concerned with a base for dry type transformer. BACKGROUND

[0002] Dry type transformer refers to the transformer that iron core and winding are not immersed in insulating oil, it mainly relies on air convection to cool, when dry type transformer operates, winding and iron core will produce heat, although natural air cooling can satisfy certain heat dissipation demand, but when high load or ambient temperature is higher, only rely on natural cooling to control temperature in reasonable range, therefore will set up fan on the base of dry type transformer and blow forced cooling.

[0003] But current dry type transformer base most adopts single layer or double layer's channel steel structure, its cooling fan is generally installed on the side wall of base, when fan blows, its initial direction is parallel to winding side wall, and is along winding side wall flow, only a few wind can enter adjacent winding between because of diffusion etc., but this part of air volume is far from enough to satisfy effective cooling demand, the part between adjacent winding cannot directly receive the blowing of cooling air, and usually bottom is close to the connecting part of iron core column and winding, and heat is relatively concentrated, the fan arranged on the side cannot directly cool the bottom, result in uneven cooling effect. CONTENT OF UTILITY MODEL

[0004] The utility model provides a base for dry type transformer to solve the problem in prior art.

[0005] The technical problem solved by the utility model is realized by the following technical scheme:

[0006] A base for dry type transformer, including the base main part installed below transformer main body, the base main part includes upper layer part and lower layer part, install the slot mouth for installing fan on the upper layer part, the installation slot mouth is same as the number of transformer main body winding and one-to-one correspondence, the side wall air inlet that is connected with lower layer part inner wall is set up on the side wall of lower layer part, allow air to enter the inside space of lower layer part from outside environment through side wall air inlet, then be inhaled to realize the air cooling of transformer main body corresponding winding by the fan of upper layer part.

[0007] Preferably, the base main part is provided with a clamping assembly for clamping the iron core of the transformer main body, the clamping assembly comprises two oppositely arranged clamping pieces and an adjustable expansion piece connected between the clamping pieces and the inner side wall of the base main body, the two clamping pieces are respectively located on both sides of the iron core and are in sliding connection with the base main body, the clamping of the iron core is realized by adjusting the length of the adjustable expansion piece to make the two clamping pieces move relatively.

[0008] Preferably, the adjustable telescopic part comprises a fixed column fixedly connected to the inner side wall of the base body and a resisting rod threadedly connected with the fixed column, and the resisting rod is fixedly connected with an adjusting nut.

[0009] Preferably, the cross section of the mounting slot is larger than the cross section of the winding, so that the air can cool the whole periphery of the winding.

[0010] Preferably, the outer side of the side wall air inlet is detachably connected with a dust filter screen for filtering the air entering the transformer body.

[0011] Preferably, the fan is detachably connected to the inside of the mounting slot.

[0012] The utility model discloses have the beneficial effect is: through setting up the fan on the base body on the winding bottom part, when the fan blows from the bottom up, will preferentially take away the heat of the bottom part, avoids the heat accumulation of bottom part, helps maintaining the balance of transformer body temperature, reduces the local overheating phenomenon, and the airflow will naturally diffuse to all directions in the ascending process, and flows up along the winding side wall, has more contact opportunities with the side wall of winding, thereby realizes the more uniform blowing cooling of winding, reduces the emergence of winding cooling dead angle. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will be briefly introduced the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description only some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0014] Figure 1 The prior art structure schematic view provided by the utility model is shown in the drawing.

[0015] Figure 2 The three-dimensional structure schematic view provided by the utility model is shown in the drawing.

[0016] Figure 3 The structure schematic view when the base body is separated from the transformer body provided by the utility model is shown in the drawing.

[0017] Figure 4 The structure schematic view when the clamp is installed on the base body in the utility model is shown in the drawing.

[0018] Figure 5 The structure schematic view when the dust filter screen is separated from the side wall air inlet in the utility model is shown in the drawing.

[0019] Figure 6The adjustable telescopic part structure schematic view of the utility model.

[0020] In the figure, 1, transformer main body;2, base main body;21, upper layer part;211, installation slot;22, lower layer part;221, side wall air inlet;3, fan;4, clamp;5, adjustable telescopic part;51, fixed column;52, abutment rod;53, adjusting nut;6, dust filter screen. DETAILED DESCRIPTION

[0021] In order to make the technical means, creation features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific drawings.

[0022] A kind of base for dry-type transformer, refer to Figure 1 As shown in the prior art structure schematic body provided by the utility model, including transformer main body 1 and the base main body 2 located below transformer main body 1, wherein, fan 3 is installed on the side of base main body 2, when fan 3 operates, the cooling airflow that it blows moves upwards along the both sides of transformer main body 1 winding to carry out cooling, however, the part between adjacent windings cannot contact the cooling airflow that fan 3 blows, will lead to the cooling effect of transformer winding uneven, therefore, the improvement point of the utility model is in that fan 3 is installed on base main body 2 at the corresponding position below transformer main body 1 winding, make the cooling airflow that fan 3 blows flows from bottom to top along the outer wall of winding to realize the cooling cooling of winding evenly;

[0023] The following will be combined with Figures 2 to 6The improvement points of the utility model are described in detail, the base body 2 includes upper layer part 21 and lower layer part 22, the base body 2 can adopt steel, iron and other high-strength, good wear-resistant metal materials, the mounting slot 211 is used for installing the fan 3, the side wall air inlet 221 that is communicated with the inner wall of the lower layer part 22 is arranged on the side wall of the lower layer part 22, when the fan 3 starts, the outside air is sucked from the side wall air inlet 221, then the wind is blown to the corresponding winding of the transformer body 1 by the fan 3 and is air-cooled, wherein the number of the mounting slot 211 is same as the winding of the transformer body 1 and is one-to-one corresponding, that is, the lower end of each winding is correspondingly provided with a fan 3, to realize targeted cooling of each winding, and the shape of the mounting slot 211 is not limited, can be circular, square and other shapes that can substantially match the cross-sectional shape of the fan 3, and the cross section of the mounting slot 211 is greater than the cross section of the winding on the transformer body 1, when the fan 3 blows out the cooling air flow upward, the heat at the bottom of the transformer body 1 is preferentially taken away, the heat accumulation at the bottom is avoided, the temperature balance of the transformer body 1 is maintained, the local overheating phenomenon is reduced, and the cooling air flow has more space to diffuse after leaving the mounting slot 211, the diffusion effect can cover the winding surface to a certain extent, to realize uniform cooling of the winding.

[0024] Referring to Figure 5 Further, in order to reduce the impurities and the like in the outside under the action of negative pressure and be sucked into the lower layer part 22, affect the normal work of the fan 3, the dust filter screen 6 can be detachably connected outside the side wall air inlet 221, such as glass fiber filter screen or multi-layer composite filter screen, to reduce the possibility of dust and lint entering, and reduce the possibility of affecting the normal operation of the fan 3 and entering the transformer body 1 due to foreign matter, when the filtering state of the dust filter screen 6 reaches saturation, it can be removed for cleaning or replacement.

[0025] The fan 3 is detachably connected to the inside of the mounting slot 211, when the dust filter screen 6 is removed, it can be inserted through the side wall air inlet 221, and the fan 3 can be removed from below to facilitate maintenance, and the detachable connection between the fan 3 and the mounting slot 211 can adopt bolt connection and other modes facilitating disassembly and assembly.

[0026] Referring to Figures 3-4As shown, further, since the iron core of the dry-type transformer is usually composed of silicon steel sheets, in order to fix the iron core composed of multiple silicon steel sheets tightly when the transformer main body 1 is running, the base main body 2 is further provided with a clamping assembly for clamping the iron core, the clamping assembly comprises two oppositely arranged clamping pieces 4 and an adjustable telescopic piece 5, the two clamping pieces 4 are respectively located on the two sides of the iron core and are in sliding connection with the base main body 2, the adjustable telescopic piece 5 is located between the inner side wall of the base main body 2 and the clamping piece 4, the clamping of the iron core is realized by adjusting the length of the adjustable telescopic piece 5 and moving the clamping piece 4 in the direction of the iron core, wherein the adjustable telescopic piece 5 comprises a fixed column 51 and a resisting rod 52 in threaded connection with the fixed column 51, the fixed column 51 is fixedly connected to the inner side wall of the base main body 2, in order to facilitate the fixation of the resisting rod 52, an adjusting nut 53 is further fixedly connected to the resisting rod 52, the position adjustment of the resisting rod 52 in the fixed column 51 is realized by the rotation of the resisting rod 52 by the adjusting nut 53, so as to realize the length adjustment of the adjustable telescopic piece 5, the clamping of the iron core by the two clamping pieces 4 is realized by the resistance of the two groups of adjustable telescopic pieces 5 to the two clamping pieces 4 respectively, and the number of the adjustable telescopic pieces 5 on each side is multiple and is equidistantly arranged along the length extension direction of the clamping piece 4, so as to improve the stability during clamping.

[0027] The basic principle and main features of the present application and the advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A base for a dry-type transformer, characterized in that, The base body (2) is installed below the transformer body (1). The base body (2) includes an upper part (21) and a lower part (22). The upper part (21) has an installation slot (211) for installing the fan (3). The number of installation slots (211) is the same as the number of windings of the transformer body (1) and they correspond one-to-one. The side wall of the lower part (22) has a side wall air inlet (221) that is connected to the inner wall of the lower part (22). Air is allowed to enter the internal space of the lower part (22) from the external environment through the side wall air inlet (221) and then be drawn in by the fan (3) of the upper part to achieve air cooling of the corresponding windings of the transformer body (1).

2. The base for a dry-type transformer according to claim 1, characterized in that, The base body (2) is provided with a clamping assembly for clamping the iron core of the transformer body (1). The clamping assembly includes two oppositely arranged clamps (4) and an adjustable telescopic member (5) connected between the clamps (4) and the inner side wall of the base body (2). The two clamps (4) are located on both sides of the iron core and are slidably connected to the base body (2). The iron core is clamped by adjusting the length of the adjustable telescopic member (5) so that the two clamps (4) can move relative to each other.

3. A base for a dry-type transformer according to claim 2, characterized in that, The adjustable telescopic component (5) includes a fixed post (51) fixedly connected to the inner side wall of the base body (2) and an abutment rod (52) threadedly connected to the fixed post (51). An adjusting nut (53) is fixedly connected to the abutment rod (52).

4. A base for a dry-type transformer according to claim 1, characterized in that, The cross-section of the mounting slot (211) is larger than the cross-section of the winding, so that the air can cool the outer periphery of the winding in all directions.

5. A base for a dry-type transformer according to claim 1, characterized in that, The side wall air inlet (221) is detachably connected to a dust filter (6) for filtering the air entering the transformer body (1).

6. A base for a dry-type transformer according to claim 1, characterized in that, The fan (3) is detachably connected to the inside of the mounting slot (211).

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