Dry-type transformer with regional self-adaptive heat dissipation

Abstract

The application discloses a dry-type transformer with sub-region adaptive heat dissipation applied to the field of transformers, and the annular air duct between high-voltage windings and low-voltage windings is divided into a plurality of independent inner annular cavities and outer annular cavities by an insulating cylinder, so that the air flow organization is significantly improved, meanwhile, the inner injection channel and the outer injection channel are arranged obliquely, so that the cooling air flow forms a cyclone in the cavity, the contact area and the heat exchange efficiency are increased, the 'chimney effect' is effectively inhibited, and the heat accumulation on the upper part of the winding is reduced; in addition, the temperature of each cavity is monitored in real time based on a fiber grating sensor, and the air volume of each air duct is accurately adjusted through an electrically-controlled air volume adjusting valve, so that the differential injection cooling is realized, and the structure improves the heat dissipation pertinence and efficiency, optimizes the air flow distribution, and reduces the energy consumption of the fan.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of transformers, in particular to a dry-type transformer with regional adaptive heat dissipation. BACKGROUND

[0002] Traditional dry-type transformers usually rely on bottom-through-flow fans to forcibly send air to the annular air duct between windings for heat dissipation. However, due to the "chimney effect" of the natural upward movement of hot air, this method tends to cause heat to accumulate at the upper part of the winding, resulting in a significant temperature difference between the upper and lower parts. This not only exacerbates the thermal aging of the insulation material and affects the service life of the transformer, but also reduces the efficiency of the cooling system and the load capacity of the transformer, as the operating temperature needs to be based on the hottest area.

[0003] The existing patent with publication number CN112331453B discloses a dry-type transformer heat dissipation system. By setting cooling flow channels, heat dissipation flow channels, air guide mechanisms, and rectangular air slots on the outer surface of the dry-type transformer, multiple air flows are formed on the outer surface of the dry-type transformer. The air flow forms an air flow curtain, which not only carries away the heat of the transformer but also cancels out the low-frequency noise generated by the transformer during operation, thereby achieving good noise reduction effect for the dry-type transformer.

[0004] The existing patent with publication number CN115424823B discloses a heat dissipation structure for a dry-type transformer. By setting a cooling output box with three arc-shaped air inlets on the rear side of the transformer body, the forced air cooling and directional flow technology are combined to enhance air flow organization, accelerate heat upward discharge, and have good adaptability to different sizes of transformers, thereby effectively improving the heat dissipation efficiency.

[0005] In the above-mentioned prior art, cooling flow channels, heat dissipation flow channels, air guide mechanisms, and rectangular air slots are set on the outer surface of the transformer. These designs help improve heat dissipation efficiency and also have noise reduction effect. In addition, directional guidance of air flow is achieved by setting multiple flow guide boxes, further enhancing the heat dissipation effect. However, the existing technology still has obvious deficiencies and cannot effectively solve the problem of heat accumulation at the upper part of the winding caused by the vertical upward movement of hot air in the annular air duct. SUMMARY

[0006] 1. Technical problem to be solved

[0007] The core of the present application is to divide the annular air duct into multiple independent annular cavities by an insulating cylinder, thereby solving the problem of heat accumulation at the upper part of the winding caused by the vertical upward movement of hot air in the annular air duct in the prior art. At the same time, by setting air ducts and electrically controlled air volume adjusting valves in the insulating cylinder, the heat dissipation is improved in terms of targeting and adaptability, and the energy consumption level is reduced.

[0008] 2. Technical solution

[0009] To solve the above problems, the application adopts the following technical solution.

[0010] A dry-type transformer with regional adaptive heat dissipation, comprising a core, the outer wall of the core is fixedly connected with two pairs of upper and lower distribution clamps, the lower pair of clamps is fixedly connected with a base, a plurality of winding assemblies are arranged between the two pairs of clamps, the winding assembly comprises a low-voltage cast winding sleeved on the outer side of the core, a high-voltage cast winding is sleeved on the outer side of the low-voltage cast winding, an insulating cylinder is fixedly connected between the low-voltage cast winding and the high-voltage cast winding, a plurality of pressing blocks are clamped on the upper end and the lower end of the low-voltage cast winding, the high-voltage cast winding and the insulating cylinder, and the pressing blocks are fixedly connected with the clamps through fixing bolts.

[0011] A plurality of vertically equidistantly distributed inner annular cavities are formed between the insulating cylinder and the low-voltage cast winding, a plurality of vertically equidistantly distributed outer annular cavities are formed between the insulating cylinder and the high-voltage cast winding, the inner annular cavities and the outer annular cavities at the same height are arranged in a concentric and opposite manner, a plurality of air inlet cooling channels are formed in the insulating cylinder, the concentrically and oppositely arranged inner annular cavities and outer annular cavities are communicated with the same air inlet cooling channel; the lower end of each air inlet cooling channel is communicated with an air inlet pipe fixedly connected with the insulating cylinder, one end of the air inlet pipe away from the insulating cylinder is fixedly communicated with a blast cylinder, the blast cylinder comprises a cylinder body, the outer wall of the cylinder body is fixedly connected with a mounting bracket, the mounting bracket is fixedly connected with the base, a fan is fixedly connected in the cylinder body, a fixed plate is fixedly connected in the cylinder body, the air inlet pipe extends to the side end face of the fixed plate facing the fan, and the part of the air inlet pipe in the cylinder body is fixedly connected with an electrically controlled air volume regulating valve.

[0012] A plurality of air outlet cooling channels are formed in the insulating cylinder, the upper parts of the cavities of the concentrically and oppositely arranged inner annular cavities and outer annular cavities are communicated with the same air outlet cooling channel, and the upper end of the air outlet cooling channel is communicated with an air outlet pipe fixedly connected with the outer wall of the insulating cylinder; an optical fiber grating temperature sensor is fixedly connected to the inner wall of the insulating cylinder, the optical fiber grating temperature sensor comprises a probe arranged in each inner annular cavity, and the fan, the electrically controlled air volume regulating valve and the optical fiber grating temperature sensor are electrically connected with the same controller.

[0013] Further, the air inlet cooling channel comprises concentrically arranged inner annular air inlet channels and outer annular air inlet channels, a plurality of equidistantly distributed inner injection channels are communicated with the upper part of the inner annular air inlet channels, the inner injection channels are communicated with the lower cavity of the inner annular cavity, a plurality of outer injection channels are communicated with the upper part of the outer annular air inlet channels, and the outer injection channels are communicated with the lower cavity of the outer annular cavity; the concentrically arranged inner annular air inlet channels and outer annular air inlet channels are communicated with the same gas injection channel, and the gas injection channel is fixedly communicated with the air inlet pipe.

[0014] Further, the exhaust air cooling channel comprises an inner annular exhaust air channel and an outer annular exhaust air channel arranged concentrically, a plurality of inner exhaust channels are communicated with the inner annular exhaust air channel at equal intervals, the inner exhaust channels are communicated with the upper cavity of the inner annular cavity, a plurality of outer exhaust channels are communicated with the outer annular exhaust air channel, the outer exhaust channels are communicated with the upper cavity of the outer annular cavity, the exhaust air cooling channel further comprises a collection channel, the inner annular exhaust air channel is communicated with the collection channel through a vertical channel one, the outer annular exhaust air channel is communicated with the collection channel through a vertical channel two, and the collection channel is communicated with the exhaust pipe.

[0015] Further, the plurality of inner injection channels are communicated with the inner annular air inlet channel at an acute angle, and the included angle between the two is an acute angle; the plurality of outer injection channels are communicated with the outer annular air inlet channel at an acute angle, and the included angle between the two is an acute angle.

[0016] Further, the insulation cylinder comprises a vertical cylinder part, the inner wall and the outer wall of the vertical cylinder part are fixedly connected with the protruding parts arranged concentrically and oppositely, the outer end edge of the protruding part away from the vertical cylinder part is fixedly connected with a rubber sealing ring, the rubber sealing ring on the inner side of the insulation cylinder is in interference fit with the outer wall of the low-voltage cast winding, and the rubber sealing ring on the outer side of the insulation cylinder is in interference fit with the inner wall of the high-voltage cast winding.

[0017] Further, the rubber sealing ring is made of heat-resistant rubber material, and an annular recess with an elliptical cross section is formed in the rubber sealing ring, and a heat-expanding medium is filled in the annular recess.

[0018] Further, a plurality of vertical flow guide strips arranged at equal intervals are fixedly connected to the side wall between the adjacent protruding parts, and the flow guide strips are annular strips with a triangular cross section.

[0019] Further, a filling cavity is formed in the shell wall of the insulation cylinder below the inner annular exhaust air channel, and a phase change material is filled in the filling cavity, and the phase change material is a paraffin material.

[0020] Further, a filter screen is fixedly connected to the opening position of the outer end of the cylinder body, a fixed frame is fixedly connected to the side wall of the cylinder body between the fan and the fixed plate, a semiconductor refrigeration sheet is fixedly connected to the inner side of the fixed frame, the refrigeration end of the semiconductor refrigeration sheet faces the inner cavity of the cylinder body, the heating end of the semiconductor refrigeration sheet abuts against a heat dissipation fin, the heat dissipation fin is in contact with the external atmosphere and is fixedly connected with the fixed frame, and the semiconductor refrigeration sheet is electrically connected with the controller.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the advantages of the present application are:

[0023] (1) The application divides the annular gap between the low-voltage casting winding and the high-voltage casting winding into a plurality of vertically equidistantly distributed inner annular cavities and outer annular cavities by the insulating cylinder, and by means of the air inlet and exhaust air cooling channels opened in the insulating cylinder, the airflow independently enters each inner annular cavity and outer annular cavity, realizes the full contact of the airflow with each part of the low-voltage casting winding and the high-voltage casting winding, and through the obliquely arranged inner and outer injection channels, the airflow forms a cyclone in the inner annular cavity and the outer annular cavity, further improves the flow coverage area of the airflow, and thus improves the heat exchange efficiency, overcomes the problem of "chimney effect" caused by the traditional vertical heat dissipation airflow channel, and reduces the probability of heat accumulation on the upper part of the low-voltage casting winding and the high-voltage casting winding.

[0024] (2) Based on the real-time detection of the temperature of each inner annular cavity by the optical fiber grating temperature sensor, the air volume adjusting valve installed on the air inlet pipe is used to adjust the air volume entering each inner annular cavity and outer annular cavity, realizing targeted blowing of different air volumes, instead of the traditional dry-type transformer using the vertical blowing of the through-flow fan arranged at the bottom, not only the airflow generated by the fan is fully utilized, reducing the energy consumption of the fan, but also the targeting and adaptability of heat dissipation are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a front perspective view of the three-dimensional structure of the application.

[0026] Figure 2 It is a rear perspective view of the three-dimensional structure of the application.

[0027] Figure 3 It is a three-dimensional assembly structure diagram of the winding assembly and the insulating cylinder in the application.

[0028] Figure 4 It is a sectional view structure diagram of the winding assembly and the insulating cylinder in the application.

[0029] Figure 5 It is Figure 4 the enlarged structure diagram of A in the application.

[0030] Figure 6 It is a horizontal sectional view structure diagram of the inner annular air inlet channel in the application.

[0031] Figure 7 It is Figure 4 the enlarged structure diagram of B in the application.

[0032] Figure 8 It is a perspective structure diagram of the air inlet and exhaust air cooling channels in the application.

[0033] Figure 9 It is Figure 4An enlarged structural schematic view at C;

[0034] Figure 10 As Figure 4 An enlarged structural schematic view at D;

[0035] Figure 11 A schematic view of the airflow in the air inlet and exhaust air cooling channels in the application.

[0036] Label explanation in the figure: 1, iron core; 2, clamping plate; 3, base; 4, low-voltage cast winding; 5, high-voltage cast winding; 6, insulation cylinder; 601, vertical cylinder part; 602, protruding part; 603, rubber sealing ring; 604, flow guide strip; 605, air inlet cooling channel; 6051, inner annular air inlet channel; 6052, outer annular air inlet channel; 6061, inner injection channel; 6062, outer injection channel; 607, air injection channel; 608, exhaust air cooling channel; 6081, inner annular exhaust channel; 6082, outer annular exhaust channel; 6091, inner discharge channel; 6092, outer discharge channel; 6101, vertical channel one; 6102, vertical channel two; 611, collection channel; 612, filling cavity; 7, pressing block; 8, fixing bolt; 9, air inlet pipe; 10, exhaust pipe; 11, air blowing cylinder; 12, cylinder body; 13, fan; 14, fixed plate; 15, electric control air volume regulating valve; 16, filter screen; 17, semiconductor refrigeration sheet; 18, fixed frame; 19, heat dissipation fin; 20, mounting bracket; 21, fiber Bragg grating temperature sensor; 2101, probe; 22, inner annular cavity; 23, outer annular cavity. DETAILED DESCRIPTION

[0037] The technical solutions will be described clearly and completely below in combination with the drawings in the embodiments of the application.

[0038] Embodiment 1: Please refer to Figures 1-11 In an embodiment of the application, a dry-type transformer with regional self-adaptive heat dissipation includes an iron core 1, two pairs of upper and lower clamping plates 2 are fixedly connected to the outer wall of the iron core 1, a base 3 is fixedly connected to the lower pair of clamping plates 2, a plurality of winding assemblies are arranged between the two pairs of clamping plates 2, the winding assembly includes a low-voltage cast winding 4 sleeved outside the iron core 1, a high-voltage cast winding 5 sleeved outside the low-voltage cast winding 4, an insulation cylinder 6 fixedly connected between the low-voltage cast winding 4 and the high-voltage cast winding 5, and a plurality of pressing blocks 7 clamped to the upper end and the lower end of the low-voltage cast winding 4, the high-voltage cast winding 5 and the insulation cylinder 6, and the pressing blocks 7 are fixedly connected with the clamping plates 2 through fixing bolts 8.

[0039] Please refer to Figure 4 and Figure 8A plurality of vertical equidistantly distributed inner annular cavities 22 are enclosed between the insulation cylinder 6 and the low-voltage casting winding 4, a plurality of vertical equidistantly distributed outer annular cavities 23 are enclosed between the insulation cylinder 6 and the high-voltage casting winding 5, the inner annular cavities 22 and the outer annular cavities 23 at the same height are arranged in a concentric manner, a plurality of air inlet cooling channels 605 are arranged in the insulation cylinder 6, and the inner annular cavities 22 and the outer annular cavities 23 arranged in a concentric manner are communicated with the same air inlet cooling channel 605;

[0040] Specifically, please refer to Figure 4 The annular cavity between the low-voltage casting winding 4 and the high-voltage casting winding 5 is divided into a plurality of inner annular cavities 22 close to the low-voltage casting winding 4 and a plurality of outer annular cavities 23 close to the high-voltage casting winding 5 by the insulation cylinder 6;

[0041] Please refer to Figure 1 、 Figure 8 and Figure 9 The air inlet pipe 9 fixedly connected with the insulation cylinder 6 is communicated with the lower end of each air inlet cooling channel 605, the air inlet pipe 9 is fixedly communicated with the air blowing cylinder 11 away from the insulation cylinder, the air blowing cylinder 11 comprises a cylinder body 12, the mounting frame 20 is fixedly connected to the outer wall of the cylinder body 12, the mounting frame 20 is fixedly connected with the base 3, the fan 13 is fixedly connected in the cylinder body 12, the fixing plate 14 is fixedly connected in the cylinder body 12, the air inlet pipe 9 extends to the side end face of the fixing plate 14 facing the fan 13, and the part of the air inlet pipe 9 in the cylinder body 12 is fixedly connected with the electrically controlled air volume regulating valve 15;

[0042] Specifically, the fan 13 is started to suck external air into the air blowing cylinder 11, and then the air is injected into each air inlet cooling channel 605 through the air inlet pipe 9, the air volume entering each air inlet cooling channel 605 is controlled through the electrically controlled air volume regulating valve 15, and then the air volume entering each inner annular cavity 22 and outer annular cavity 23 is controlled, and it should be noted that the cylinder body 12 is made of magnetic shielding material, the fan 13 and the electrically controlled air volume regulating valve 15 are installed in the cylinder body 12, and the influence of the complex electromagnetic environment on the fan 13 and the electrically controlled air volume regulating valve 15 is reduced;

[0043] Please refer to Figure 5 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10The insulation cylinder 6 is provided with a plurality of exhaust air cooling channels 608, the upper portions of the cavity of the inner annular cavity 22 and the outer annular cavity 23 arranged in a concentric and opposite manner are communicated with the same exhaust air cooling channel 608, and the upper end of the exhaust air cooling channel 608 is communicated with an exhaust pipe 10 fixedly connected with the outer wall of the insulation cylinder 6; the inner wall of the insulation cylinder 6 is fixedly connected with a fiber grating temperature sensor 21, the fiber grating temperature sensor 21 includes a probe 2101 arranged in each inner annular cavity 22, the fan 13, the electrically controlled air volume regulating valve 15 and the fiber grating temperature sensor 21 are electrically connected with the same controller.

[0044] Specifically, the airflow entering the inner annular cavity 22 exchanges heat with the low-voltage cast winding 4, the airflow entering the outer annular cavity 23 exchanges heat with the high-voltage cast winding 5, the hot air of the inner annular cavity 22 and the outer annular cavity 23 is discharged into the exhaust pipe 10 through the exhaust air cooling channel 608, and finally discharged into the atmosphere; and the temperature in each inner annular cavity 22 is monitored by the fiber grating temperature sensor 21, the controller controls the electrically controlled air volume regulating valve 15 to control the air volume entering each inner annular cavity 22 and outer annular cavity 23, and then targeted blowing heat dissipation (more air volume is injected into the inner annular cavity 22 with high temperature, and less air volume is injected into the inner annular cavity 22 with low temperature) is performed.

[0045] It should be noted that the reason for arranging the probe 2101 of the fiber grating temperature sensor 21 in the inner annular cavity 22 instead of the outer annular cavity 23 is that the low-voltage cast winding 4 has the largest heat generation among the dry-type transformer components, the inner annular cavity 22 is close to the low-voltage cast winding 4, in addition, the probe 2101 is a fiber Bragg grating, a plurality of probes 2101 are connected in series through a transmission fiber, and the end of the transmission fiber is connected with a demodulator (not shown) Figure 9 ), the demodulator is fixed in the cylinder body 12, and the fiber grating temperature sensor 21 is a prior art, which will not be described here.

[0046] Compared with the traditional dry-type transformer, the annular gap between the low-voltage cast winding 4 and the high-voltage cast winding 5 is divided into a plurality of vertically equidistant inner annular cavities 22 and outer annular cavities 23 by the insulating cylinder 6, and the air inlet air cooling channel 605 and the air outlet air cooling channel 608 are opened in the insulating cylinder 6, so that the air flow independently enters each inner annular cavity 22 and outer annular cavity 23, so that the air flow is in full contact with each part of the low-voltage cast winding 4 and the high-voltage cast winding 5, the flow coverage area of the air flow is improved, and the heat exchange efficiency is improved, thereby overcoming the "chimney effect" problem caused by the traditional vertical heat dissipation air flow channel, reducing the probability of heat accumulation on the upper part of the low-voltage cast winding 4 and the high-voltage cast winding 5, and at the same time, based on the real-time detection of the temperature of each inner annular cavity 22 by the fiber grating temperature sensor 21, the air volume adjusting valve 15 installed on the air inlet pipe 9 is used to adjust the air volume entering each inner annular cavity 22 and outer annular cavity 23, realizing targeted blowing of different air volumes, instead of the traditional dry-type transformer using the through-flow fan arranged at the bottom to realize vertical blowing heat dissipation, not only improving the targeting and heat dissipation efficiency of heat dissipation, but also fully utilizing the air flow generated by the fan, reducing the energy consumption level of the fan.

[0047] Please refer to Figure 5 , Figure 6 , Figure 8 and Figure 10 , the air inlet air cooling channel 605 includes concentrically arranged inner annular air inlet channel 6051 and outer annular air inlet channel 6052, a plurality of equidistantly distributed inner injection channels 6061 are communicated on the inner annular air inlet channel 6051, the inner injection channels 6061 are communicated with the lower cavity of the inner annular cavity 22, a plurality of outer injection channels 6062 are communicated on the outer annular air inlet channel 6052, the outer injection channels 6062 are communicated with the lower cavity of the outer annular cavity 23; the concentrically arranged inner annular air inlet channel 6051 and outer annular air inlet channel 6052 are communicated with the same air injection channel 607, and the air injection channel 607 is fixedly communicated with the air inlet pipe 9.

[0048] Specifically, please refer to Figure 5 and Figure 11 , the air flow enters the air injection channel 607 through the air inlet pipe 9, and then enters the inner annular air inlet channel 6051 and the outer annular air inlet channel 6052 through the air injection channel 607, the air flow enters the inner annular air inlet channel 6051 and is injected into the inner annular cavity 22 through the inner injection channel 6061, the air flow entering the inner annular cavity 22 contacts the outer surface of the low-voltage cast winding 4, realizing heat exchange between the air flow and the low-voltage cast winding 4; at the same time, the air flow entering the outer annular air inlet channel 6052 is injected into the outer annular cavity 23 through the outer injection channel 6062, and the air flow entering the outer annular cavity 23 sprays the inner surface of the high-voltage cast winding 5, realizing heat exchange between the air flow and the high-voltage cast winding 5.

[0049] Please refer to Figure 4 , Figure 7 , Figure 8 and Figure 10 , the exhaust air cooling channel 608 includes concentrically arranged inner annular exhaust channel 6081 and outer annular exhaust channel 6082, a plurality of equidistantly distributed inner exhaust channels 6091 are communicated on the inner annular exhaust channel 6081, the inner exhaust channels 6091 are communicated with the upper cavity of the inner annular cavity 22, a plurality of outer exhaust channels 6092 are communicated on the outer annular exhaust channel 6082, the outer exhaust channels 6092 are communicated with the upper cavity of the outer annular cavity 23; the exhaust air cooling channel 608 further includes a collection channel 611, the inner annular exhaust channel 6081 is communicated with the collection channel 611 through vertical channel one 6101, the outer annular exhaust channel 6082 is communicated with the collection channel 611 through vertical channel two 6102, and the collection channel 611 is communicated with the exhaust pipe 10.

[0050] Specifically, please refer to Figure 4 , Figure 7 and Figure 11 , the hot gas flow in the inner annular cavity 22 enters the inner annular exhaust channel 6081 through the inner exhaust channels 6091, the hot gas flow entering the inner annular exhaust channel 6081 enters the collection channel 611 through the vertical channel one 6101, at the same time, the hot gas flow in the outer annular cavity 23 enters the outer annular exhaust channel 6082 through the outer exhaust channels 6092, the hot gas flow entering the outer annular exhaust channel 6082 enters the collection channel 611 through the vertical channel two 6102, and the hot gas flow entering the collection channel 611 is discharged through the exhaust pipe 10.

[0051] Please refer to Figure 6 and Figure 8 , a plurality of inner injection channels 6061 are obliquely communicated with the inner annular air inlet channel 6051, and the included angle therebetween is an acute angle; a plurality of outer injection channels 6062 are obliquely communicated with the outer annular air inlet channel 6052, and the included angle therebetween is an acute angle.

[0052] Specifically, by obliquely arranging the inner injection channels 6061 and the outer injection channels 6062, the airflow entering the inner annular cavity 22 and the outer annular cavity 23 forms a rotational flow, further improving the contact coverage of the airflow with the low-pressure casting winding 4 and the high-pressure casting winding 5, and further improving the heat exchange effect.

[0053] Please refer to Figure 5 and Figure 7 , the gas injection channel 607 is U-shaped, and the lower curved part thereof is located below both the low-pressure casting winding 4 and the high-pressure casting winding 5 after installation, the collection channel 611 is a horizontal columnar cavity structure, and its position is above both the low-pressure casting winding 4 and the high-pressure casting winding 5 after installation.

[0054] Specifically, since the inner injection channel 6061 communicates with the inner annular cavity 22, and the outer injection channel 6062 communicates with the outer annular cavity 23, if the inner injection channel 6061 and the outer injection channel 6062 adopt a straight communication mode, the insulating barrel 6 is prone to be punctured, resulting in a decrease in the insulation performance, and therefore the gas injection channel 607 in a U shape is adopted to avoid the puncture of the insulating barrel 6, and for the same reason, the inner discharge channel 6091 and the outer discharge channel 6092 communicate with the two respectively through the separately arranged vertical channel one 6101 and the vertical channel two 6102, and also serve to reduce the puncture probability of the insulating barrel 6.

[0055] Please refer to Figure 3 , Figure 4 and Figure 5 , the insulating barrel 6 includes a vertical barrel portion 601, the inner wall and the outer wall of the vertical barrel portion 601 are fixedly connected with the protruding portions 602 which are arranged in a concentric and opposite manner, the outer end edges of the protruding portions 602 away from the vertical barrel portion 601 are fixedly connected with the rubber sealing rings 603, the rubber sealing ring 603 located on the inner side of the insulating barrel 6 is in interference fit with the outer wall of the low-voltage cast winding 4, and the rubber sealing ring 603 located on the outer side of the insulating barrel 6 is in interference fit with the inner wall of the high-voltage cast winding 5.

[0056] Specifically, the annular gap between the vertical barrel portion 601 and the low-voltage cast winding 4 and the high-voltage cast winding 5 is divided into a plurality of inner annular cavities 22 and outer annular cavities 23 which are vertically and equidistantly distributed by the protruding portions 602 and the rubber sealing rings 603, and it should be noted that the insulating barrel 6 is generally made of DMC (mass molding compound) or BMC (block molding compound) through a molding process (prior art), and is hard in texture, and therefore the rubber sealing ring 603 is needed for sealing.

[0057] Please refer to Figure 5 , the rubber sealing ring 603 is made of heat-resistant rubber material, and an annular recess with an elliptical cross section is formed in the inside of the rubber sealing ring 603, and the annular recess is filled with a heat-expandable medium.

[0058] Specifically, the annular recess with an elliptical cross section is provided in the rubber sealing ring 603, and the annular recess is filled with a heat-expandable medium, so that the rubber sealing ring 603 is deformed and expanded in the radial direction after being heated, and the sealing effect is improved, and it should be noted that the heat-expandable medium is one of food-grade mineral oil or paraffin.

[0059] Please refer to Figure 5 , a plurality of vertically and equidistantly distributed flow guide strips 604 are fixedly connected to the side walls between the adjacent protruding portions 602 of the vertical barrel portion 601, and the flow guide strips 604 are annular strips with a triangular cross section.

[0060] Specifically, when the air flow rotates in the inner annular cavity 22 and the outer annular cavity 23, the vertically equidistantly distributed plurality of guide vanes 604 causes the air flow to be pushed to the outer wall of the low-voltage casting winding 4 and the inner wall of the high-voltage casting winding 5 multiple times, thereby improving the contact effect of the air flow with the outer wall of the low-voltage casting winding 4 and the inner wall of the high-voltage casting winding 5.

[0061] Embodiment 2: Based on Embodiment 1, please refer to Figure 4 and Figure 10 In this embodiment, the filling cavity 612 is arranged in the shell wall of the insulating cylinder 6 below the inner annular exhaust passage 6081, and the filling cavity 612 is filled with a phase change material, which is a paraffin material. Specifically, the phase change material arranged in the filling cavity 612 absorbs the heat of the air flow accumulated in the upper part of the inner annular cavity 22, reduces the temperature variation amplitude of the cavity in the upper part of the inner annular cavity 22, further reduces the influence of the "chimney effect", and reduces the heat accumulation in the upper part of the inner annular cavity 22. The paraffin material is specifically a normal alkane.

[0062] Please refer to Figure 9 The filter screen 16 is fixedly connected to the outer end opening position of the cylinder body 12, the fixed frame 18 is fixedly connected to the side wall of the cylinder body 12 between the fan 13 and the fixed plate 14, the semiconductor refrigeration sheet 17 is fixedly connected to the inner side of the fixed frame 18, the refrigeration end of the semiconductor refrigeration sheet 17 faces the inner cavity of the cylinder body 12, the heating end of the semiconductor refrigeration sheet 17 abuts against the heat dissipation fin 19, the heat dissipation fin 19 is in contact with the external atmosphere and is fixedly connected with the fixed frame 18, and the semiconductor refrigeration sheet 17 is electrically connected with the controller.

[0063] Specifically, the dust in the air is filtered through the filter screen 16, and the air is cooled through the semiconductor refrigeration sheet 17 to generate low-temperature air flow, thereby further improving the cooling effect of the low-voltage casting winding 4 and the high-voltage casting winding 5, preventing the temperature of the low-voltage casting winding 4 and the high-voltage casting winding 5 from rising too high during overload operation, and especially when the fan 13 is working at full power and the temperature in the inner annular cavity 22 is still higher than the set temperature threshold, the semiconductor refrigeration sheet 17 is started to generate cold air for heat dissipation.

[0064] The above describes only the preferred specific embodiments of the present application; however, the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes to the technical solutions and the improved concepts of the present application within the technical range disclosed by the present application, which should be covered by the protection scope of the present application.

Claims

1. A dry-type transformer with zonal adaptive cooling, characterized in that, The iron core (1) is fixedly connected with two pairs of upper and lower clamping plates (2), one pair of clamping plates (2) on the lower side is fixedly connected with a base (3), a plurality of winding assembly is arranged between the two pairs of clamping plates (2), the winding assembly comprises a low-voltage casting winding (4) sleeved on the outer side of the iron core (1), the low-voltage casting winding (4) is sleeved with a high-voltage casting winding (5) on the outer side, the low-voltage casting winding (4) and the high-voltage casting winding (5) are fixedly connected with an insulating cylinder (6), the low-voltage casting winding (4), the high-voltage casting winding (5) and the insulating cylinder (6) are fixedly connected with a plurality of pressing blocks (7) on the upper end and the lower end, and the pressing blocks (7) are fixedly connected with the clamping plates (2) through fixing bolts (8); A plurality of vertical equidistantly distributed inner annular cavities (22) are formed between the insulating cylinder (6) and the low-voltage casting winding (4), a plurality of vertical equidistantly distributed outer annular cavities (23) are formed between the insulating cylinder (6) and the high-voltage casting winding (5), the inner annular cavities (22) and the outer annular cavities (23) at the same height are arranged in a concentric opposite manner, a plurality of air inlet air cooling channels (605) are formed in the insulating cylinder (6), the concentrically opposite inner annular cavities (22) and the outer annular cavities (23) are communicated with the same air inlet air cooling channel (605), and the lower end of each air inlet air cooling channel (605) is communicated with an air inlet pipe (9) fixedly connected with the insulating cylinder (6); one end of the air inlet pipe (9) away from the insulating cylinder (6) is fixedly communicated with a blast cylinder (11), the blast cylinder (11) comprises a cylinder body (12), the cylinder body (12) is fixedly connected with a mounting rack (20), the mounting rack (20) is fixedly connected with the base (3), the cylinder body (12) is fixedly connected with a fan (13) and a fixed plate (14), the air inlet pipe (9) extends to one side end face of the fixed plate (14) facing the fan (13), and the portion of the air inlet pipe (9) in the cylinder body (12) is fixedly connected with an electrically-controlled air volume regulating valve (15); A plurality of air exhaust air cooling channels (608) are formed in the insulating cylinder (6), the cavity upper portions of the concentrically opposite inner annular cavities (22) and the outer annular cavities (23) are communicated with the same air exhaust air cooling channel (608), and the upper end of the air exhaust air cooling channel (608) is communicated with an air exhaust pipe (10) fixedly connected with the outer wall of the insulating cylinder (6); an optical fiber grating temperature sensor (21) is fixedly connected to the inner wall of the insulating cylinder (6), the optical fiber grating temperature sensor (21) comprises a probe (2101) arranged in each inner annular cavity (22), and the fan (13), the electrically-controlled air volume regulating valve (15) and the optical fiber grating temperature sensor (21) are electrically connected with the same controller; The exhaust air cooling channel (608) comprises an inner annular exhaust air channel (6081) and an outer annular exhaust air channel (6082) arranged concentrically, the inner annular exhaust air channel (6081) is communicated with a plurality of equidistantly distributed inner exhaust channels (6091), the inner exhaust channels (6091) are communicated with the upper cavity of the inner annular cavity (22), the outer annular exhaust air channel (6082) is communicated with a plurality of outer exhaust channels (6092), the outer exhaust channels (6092) are communicated with the upper cavity of the outer annular cavity (23); the exhaust air cooling channel (608) further comprises a collection channel (611), the inner annular exhaust air channel (6081) is communicated with the collection channel (611) through a vertical channel one (6101), the outer annular exhaust air channel (6082) is communicated with the collection channel (611) through a vertical channel two (6102), the collection channel (611) is communicated with the exhaust pipe (10), the insulation cylinder (6) is provided with a filling cavity (612) below the inner annular exhaust air channel (6081) in the shell wall, the filling cavity (612) is filled with a phase change material, and the phase change material is a paraffin material; The insulation cylinder (6) comprises a vertical cylinder portion (601), the inner wall and the outer wall of the vertical cylinder portion (601) are fixedly connected with the concentrically arranged protruding portions (602), the outer end edges of the protruding portions (602) away from the vertical cylinder portion (601) are fixedly connected with rubber sealing rings (603), the rubber sealing rings (603) on the inner side of the insulation cylinder (6) are in interference fit with the outer wall of the low-voltage cast winding (4), and the rubber sealing rings (603) on the outer side of the insulation cylinder (6) are in interference fit with the inner wall of the high-voltage cast winding (5); the rubber sealing rings (603) are made of heat-resistant rubber material, and an annular recessed cavity with an elliptical cross section is formed in the rubber sealing rings (603), and a heat-expanding medium is filled in the annular recessed cavity; a plurality of vertical equidistantly distributed flow guide strips (604) are fixedly connected to the side walls of the vertical cylinder portion (601) between the adjacent protruding portions (602), and the flow guide strips (604) are annular strips with a triangular cross section.

2. The dry-type transformer of claim 1, wherein, The intake air cooling channel (605) comprises an inner annular intake air channel (6051) and an outer annular intake air channel (6052) arranged concentrically, the inner annular intake air channel (6051) is communicated with a plurality of equidistantly distributed inner injection channels (6061), the inner injection channels (6061) are communicated with the lower cavity of the inner annular cavity (22), the outer annular intake air channel (6052) is communicated with a plurality of outer injection channels (6062), and the outer injection channels (6062) are communicated with the lower cavity of the outer annular cavity (23); the concentrically arranged inner annular intake air channel (6051) and outer annular intake air channel (6052) are communicated with the same gas injection channel (607), and the gas injection channel (607) is fixedly communicated with the gas inlet pipe (9).

3. The dry-type transformer of claim 2, wherein, The plurality of inner injection channels (6061) are obliquely communicated with the inner annular intake air channel (6051), and the included angle between the inner injection channels (6061) and the inner annular intake air channel (6051) is an acute angle; the plurality of outer injection channels (6062) are obliquely communicated with the outer annular intake air channel (6052), and the included angle between the outer injection channels (6062) and the outer annular intake air channel (6052) is an acute angle.

4. The dry-type transformer of claim 1, wherein, The filter screen (16) is fixedly connected to the outer end opening position of the barrel (12), the fixed frame (18) is fixedly connected to the side wall between the fan (13) and the fixed plate (14), the semiconductor refrigeration sheet (17) is fixedly connected to the inner side of the fixed frame (18), the refrigeration end of the semiconductor refrigeration sheet (17) faces the inner cavity of the barrel (12), the heat generation end of the semiconductor refrigeration sheet (17) abuts against the heat dissipation fin (19), the heat dissipation fin (19) is in contact with the external atmosphere and is fixedly connected with the fixed frame (18), and the semiconductor refrigeration sheet (17) is electrically connected with the controller.

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